l0bsterssg

js-yaml.js (110455B)

---

 /* js-yaml 3.14.0 https://github.com/nodeca/js-yaml */(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.jsyaml = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
 'use strict';
 
 
 var loader = require('./js-yaml/loader');
 var dumper = require('./js-yaml/dumper');
 
 
 function deprecated(name) {
   return function () {
     throw new Error('Function ' + name + ' is deprecated and cannot be used.');
   };
 }
 
 
 module.exports.Type                = require('./js-yaml/type');
 module.exports.Schema              = require('./js-yaml/schema');
 module.exports.FAILSAFE_SCHEMA     = require('./js-yaml/schema/failsafe');
 module.exports.JSON_SCHEMA         = require('./js-yaml/schema/json');
 module.exports.CORE_SCHEMA         = require('./js-yaml/schema/core');
 module.exports.DEFAULT_SAFE_SCHEMA = require('./js-yaml/schema/default_safe');
 module.exports.DEFAULT_FULL_SCHEMA = require('./js-yaml/schema/default_full');
 module.exports.load                = loader.load;
 module.exports.loadAll             = loader.loadAll;
 module.exports.safeLoad            = loader.safeLoad;
 module.exports.safeLoadAll         = loader.safeLoadAll;
 module.exports.dump                = dumper.dump;
 module.exports.safeDump            = dumper.safeDump;
 module.exports.YAMLException       = require('./js-yaml/exception');
 
 // Deprecated schema names from JS-YAML 2.0.x
 module.exports.MINIMAL_SCHEMA = require('./js-yaml/schema/failsafe');
 module.exports.SAFE_SCHEMA    = require('./js-yaml/schema/default_safe');
 module.exports.DEFAULT_SCHEMA = require('./js-yaml/schema/default_full');
 
 // Deprecated functions from JS-YAML 1.x.x
 module.exports.scan           = deprecated('scan');
 module.exports.parse          = deprecated('parse');
 module.exports.compose        = deprecated('compose');
 module.exports.addConstructor = deprecated('addConstructor');
 
 },{"./js-yaml/dumper":3,"./js-yaml/exception":4,"./js-yaml/loader":5,"./js-yaml/schema":7,"./js-yaml/schema/core":8,"./js-yaml/schema/default_full":9,"./js-yaml/schema/default_safe":10,"./js-yaml/schema/failsafe":11,"./js-yaml/schema/json":12,"./js-yaml/type":13}],2:[function(require,module,exports){
 'use strict';
 
 
 function isNothing(subject) {
   return (typeof subject === 'undefined') || (subject === null);
 }
 
 
 function isObject(subject) {
   return (typeof subject === 'object') && (subject !== null);
 }
 
 
 function toArray(sequence) {
   if (Array.isArray(sequence)) return sequence;
   else if (isNothing(sequence)) return [];
 
   return [ sequence ];
 }
 
 
 function extend(target, source) {
   var index, length, key, sourceKeys;
 
   if (source) {
     sourceKeys = Object.keys(source);
 
     for (index = 0, length = sourceKeys.length; index < length; index += 1) {
       key = sourceKeys[index];
       target[key] = source[key];
     }
   }
 
   return target;
 }
 
 
 function repeat(string, count) {
   var result = '', cycle;
 
   for (cycle = 0; cycle < count; cycle += 1) {
     result += string;
   }
 
   return result;
 }
 
 
 function isNegativeZero(number) {
   return (number === 0) && (Number.NEGATIVE_INFINITY === 1 / number);
 }
 
 
 module.exports.isNothing      = isNothing;
 module.exports.isObject       = isObject;
 module.exports.toArray        = toArray;
 module.exports.repeat         = repeat;
 module.exports.isNegativeZero = isNegativeZero;
 module.exports.extend         = extend;
 
 },{}],3:[function(require,module,exports){
 'use strict';
 
 /*eslint-disable no-use-before-define*/
 
 var common              = require('./common');
 var YAMLException       = require('./exception');
 var DEFAULT_FULL_SCHEMA = require('./schema/default_full');
 var DEFAULT_SAFE_SCHEMA = require('./schema/default_safe');
 
 var _toString       = Object.prototype.toString;
 var _hasOwnProperty = Object.prototype.hasOwnProperty;
 
 var CHAR_TAB                  = 0x09; /* Tab */
 var CHAR_LINE_FEED            = 0x0A; /* LF */
 var CHAR_CARRIAGE_RETURN      = 0x0D; /* CR */
 var CHAR_SPACE                = 0x20; /* Space */
 var CHAR_EXCLAMATION          = 0x21; /* ! */
 var CHAR_DOUBLE_QUOTE         = 0x22; /* " */
 var CHAR_SHARP                = 0x23; /* # */
 var CHAR_PERCENT              = 0x25; /* % */
 var CHAR_AMPERSAND            = 0x26; /* & */
 var CHAR_SINGLE_QUOTE         = 0x27; /* ' */
 var CHAR_ASTERISK             = 0x2A; /* * */
 var CHAR_COMMA                = 0x2C; /* , */
 var CHAR_MINUS                = 0x2D; /* - */
 var CHAR_COLON                = 0x3A; /* : */
 var CHAR_EQUALS               = 0x3D; /* = */
 var CHAR_GREATER_THAN         = 0x3E; /* > */
 var CHAR_QUESTION             = 0x3F; /* ? */
 var CHAR_COMMERCIAL_AT        = 0x40; /* @ */
 var CHAR_LEFT_SQUARE_BRACKET  = 0x5B; /* [ */
 var CHAR_RIGHT_SQUARE_BRACKET = 0x5D; /* ] */
 var CHAR_GRAVE_ACCENT         = 0x60; /* ` */
 var CHAR_LEFT_CURLY_BRACKET   = 0x7B; /* { */
 var CHAR_VERTICAL_LINE        = 0x7C; /* | */
 var CHAR_RIGHT_CURLY_BRACKET  = 0x7D; /* } */
 
 var ESCAPE_SEQUENCES = {};
 
 ESCAPE_SEQUENCES[0x00]   = '\\0';
 ESCAPE_SEQUENCES[0x07]   = '\\a';
 ESCAPE_SEQUENCES[0x08]   = '\\b';
 ESCAPE_SEQUENCES[0x09]   = '\\t';
 ESCAPE_SEQUENCES[0x0A]   = '\\n';
 ESCAPE_SEQUENCES[0x0B]   = '\\v';
 ESCAPE_SEQUENCES[0x0C]   = '\\f';
 ESCAPE_SEQUENCES[0x0D]   = '\\r';
 ESCAPE_SEQUENCES[0x1B]   = '\\e';
 ESCAPE_SEQUENCES[0x22]   = '\\"';
 ESCAPE_SEQUENCES[0x5C]   = '\\\\';
 ESCAPE_SEQUENCES[0x85]   = '\\N';
 ESCAPE_SEQUENCES[0xA0]   = '\\_';
 ESCAPE_SEQUENCES[0x2028] = '\\L';
 ESCAPE_SEQUENCES[0x2029] = '\\P';
 
 var DEPRECATED_BOOLEANS_SYNTAX = [
   'y', 'Y', 'yes', 'Yes', 'YES', 'on', 'On', 'ON',
   'n', 'N', 'no', 'No', 'NO', 'off', 'Off', 'OFF'
 ];
 
 function compileStyleMap(schema, map) {
   var result, keys, index, length, tag, style, type;
 
   if (map === null) return {};
 
   result = {};
   keys = Object.keys(map);
 
   for (index = 0, length = keys.length; index < length; index += 1) {
     tag = keys[index];
     style = String(map[tag]);
 
     if (tag.slice(0, 2) === '!!') {
       tag = 'tag:yaml.org,2002:' + tag.slice(2);
     }
     type = schema.compiledTypeMap['fallback'][tag];
 
     if (type && _hasOwnProperty.call(type.styleAliases, style)) {
       style = type.styleAliases[style];
     }
 
     result[tag] = style;
   }
 
   return result;
 }
 
 function encodeHex(character) {
   var string, handle, length;
 
   string = character.toString(16).toUpperCase();
 
   if (character <= 0xFF) {
     handle = 'x';
     length = 2;
   } else if (character <= 0xFFFF) {
     handle = 'u';
     length = 4;
   } else if (character <= 0xFFFFFFFF) {
     handle = 'U';
     length = 8;
   } else {
     throw new YAMLException('code point within a string may not be greater than 0xFFFFFFFF');
   }
 
   return '\\' + handle + common.repeat('0', length - string.length) + string;
 }
 
 function State(options) {
   this.schema        = options['schema'] || DEFAULT_FULL_SCHEMA;
   this.indent        = Math.max(1, (options['indent'] || 2));
   this.noArrayIndent = options['noArrayIndent'] || false;
   this.skipInvalid   = options['skipInvalid'] || false;
   this.flowLevel     = (common.isNothing(options['flowLevel']) ? -1 : options['flowLevel']);
   this.styleMap      = compileStyleMap(this.schema, options['styles'] || null);
   this.sortKeys      = options['sortKeys'] || false;
   this.lineWidth     = options['lineWidth'] || 80;
   this.noRefs        = options['noRefs'] || false;
   this.noCompatMode  = options['noCompatMode'] || false;
   this.condenseFlow  = options['condenseFlow'] || false;
 
   this.implicitTypes = this.schema.compiledImplicit;
   this.explicitTypes = this.schema.compiledExplicit;
 
   this.tag = null;
   this.result = '';
 
   this.duplicates = [];
   this.usedDuplicates = null;
 }
 
 // Indents every line in a string. Empty lines (\n only) are not indented.
 function indentString(string, spaces) {
   var ind = common.repeat(' ', spaces),
       position = 0,
       next = -1,
       result = '',
       line,
       length = string.length;
 
   while (position < length) {
     next = string.indexOf('\n', position);
     if (next === -1) {
       line = string.slice(position);
       position = length;
     } else {
       line = string.slice(position, next + 1);
       position = next + 1;
     }
 
     if (line.length && line !== '\n') result += ind;
 
     result += line;
   }
 
   return result;
 }
 
 function generateNextLine(state, level) {
   return '\n' + common.repeat(' ', state.indent * level);
 }
 
 function testImplicitResolving(state, str) {
   var index, length, type;
 
   for (index = 0, length = state.implicitTypes.length; index < length; index += 1) {
     type = state.implicitTypes[index];
 
     if (type.resolve(str)) {
       return true;
     }
   }
 
   return false;
 }
 
 // [33] s-white ::= s-space | s-tab
 function isWhitespace(c) {
   return c === CHAR_SPACE || c === CHAR_TAB;
 }
 
 // Returns true if the character can be printed without escaping.
 // From YAML 1.2: "any allowed characters known to be non-printable
 // should also be escaped. [However,] This isn’t mandatory"
 // Derived from nb-char - \t - #x85 - #xA0 - #x2028 - #x2029.
 function isPrintable(c) {
   return  (0x00020 <= c && c <= 0x00007E)
       || ((0x000A1 <= c && c <= 0x00D7FF) && c !== 0x2028 && c !== 0x2029)
       || ((0x0E000 <= c && c <= 0x00FFFD) && c !== 0xFEFF /* BOM */)
       ||  (0x10000 <= c && c <= 0x10FFFF);
 }
 
 // [34] ns-char ::= nb-char - s-white
 // [27] nb-char ::= c-printable - b-char - c-byte-order-mark
 // [26] b-char  ::= b-line-feed | b-carriage-return
 // [24] b-line-feed       ::=     #xA    /* LF */
 // [25] b-carriage-return ::=     #xD    /* CR */
 // [3]  c-byte-order-mark ::=     #xFEFF
 function isNsChar(c) {
   return isPrintable(c) && !isWhitespace(c)
     // byte-order-mark
     && c !== 0xFEFF
     // b-char
     && c !== CHAR_CARRIAGE_RETURN
     && c !== CHAR_LINE_FEED;
 }
 
 // Simplified test for values allowed after the first character in plain style.
 function isPlainSafe(c, prev) {
   // Uses a subset of nb-char - c-flow-indicator - ":" - "#"
   // where nb-char ::= c-printable - b-char - c-byte-order-mark.
   return isPrintable(c) && c !== 0xFEFF
     // - c-flow-indicator
     && c !== CHAR_COMMA
     && c !== CHAR_LEFT_SQUARE_BRACKET
     && c !== CHAR_RIGHT_SQUARE_BRACKET
     && c !== CHAR_LEFT_CURLY_BRACKET
     && c !== CHAR_RIGHT_CURLY_BRACKET
     // - ":" - "#"
     // /* An ns-char preceding */ "#"
     && c !== CHAR_COLON
     && ((c !== CHAR_SHARP) || (prev && isNsChar(prev)));
 }
 
 // Simplified test for values allowed as the first character in plain style.
 function isPlainSafeFirst(c) {
   // Uses a subset of ns-char - c-indicator
   // where ns-char = nb-char - s-white.
   return isPrintable(c) && c !== 0xFEFF
     && !isWhitespace(c) // - s-white
     // - (c-indicator ::=
     // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}”
     && c !== CHAR_MINUS
     && c !== CHAR_QUESTION
     && c !== CHAR_COLON
     && c !== CHAR_COMMA
     && c !== CHAR_LEFT_SQUARE_BRACKET
     && c !== CHAR_RIGHT_SQUARE_BRACKET
     && c !== CHAR_LEFT_CURLY_BRACKET
     && c !== CHAR_RIGHT_CURLY_BRACKET
     // | “#” | “&” | “*” | “!” | “|” | “=” | “>” | “'” | “"”
     && c !== CHAR_SHARP
     && c !== CHAR_AMPERSAND
     && c !== CHAR_ASTERISK
     && c !== CHAR_EXCLAMATION
     && c !== CHAR_VERTICAL_LINE
     && c !== CHAR_EQUALS
     && c !== CHAR_GREATER_THAN
     && c !== CHAR_SINGLE_QUOTE
     && c !== CHAR_DOUBLE_QUOTE
     // | “%” | “@” | “`”)
     && c !== CHAR_PERCENT
     && c !== CHAR_COMMERCIAL_AT
     && c !== CHAR_GRAVE_ACCENT;
 }
 
 // Determines whether block indentation indicator is required.
 function needIndentIndicator(string) {
   var leadingSpaceRe = /^\n* /;
   return leadingSpaceRe.test(string);
 }
 
 var STYLE_PLAIN   = 1,
     STYLE_SINGLE  = 2,
     STYLE_LITERAL = 3,
     STYLE_FOLDED  = 4,
     STYLE_DOUBLE  = 5;
 
 // Determines which scalar styles are possible and returns the preferred style.
 // lineWidth = -1 => no limit.
 // Pre-conditions: str.length > 0.
 // Post-conditions:
 //    STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.
 //    STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).
 //    STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth != -1).
 function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, testAmbiguousType) {
   var i;
   var char, prev_char;
   var hasLineBreak = false;
   var hasFoldableLine = false; // only checked if shouldTrackWidth
   var shouldTrackWidth = lineWidth !== -1;
   var previousLineBreak = -1; // count the first line correctly
   var plain = isPlainSafeFirst(string.charCodeAt(0))
           && !isWhitespace(string.charCodeAt(string.length - 1));
 
   if (singleLineOnly) {
     // Case: no block styles.
     // Check for disallowed characters to rule out plain and single.
     for (i = 0; i < string.length; i++) {
       char = string.charCodeAt(i);
       if (!isPrintable(char)) {
         return STYLE_DOUBLE;
       }
       prev_char = i > 0 ? string.charCodeAt(i - 1) : null;
       plain = plain && isPlainSafe(char, prev_char);
     }
   } else {
     // Case: block styles permitted.
     for (i = 0; i < string.length; i++) {
       char = string.charCodeAt(i);
       if (char === CHAR_LINE_FEED) {
         hasLineBreak = true;
         // Check if any line can be folded.
         if (shouldTrackWidth) {
           hasFoldableLine = hasFoldableLine ||
             // Foldable line = too long, and not more-indented.
             (i - previousLineBreak - 1 > lineWidth &&
              string[previousLineBreak + 1] !== ' ');
           previousLineBreak = i;
         }
       } else if (!isPrintable(char)) {
         return STYLE_DOUBLE;
       }
       prev_char = i > 0 ? string.charCodeAt(i - 1) : null;
       plain = plain && isPlainSafe(char, prev_char);
     }
     // in case the end is missing a \n
     hasFoldableLine = hasFoldableLine || (shouldTrackWidth &&
       (i - previousLineBreak - 1 > lineWidth &&
        string[previousLineBreak + 1] !== ' '));
   }
   // Although every style can represent \n without escaping, prefer block styles
   // for multiline, since they're more readable and they don't add empty lines.
   // Also prefer folding a super-long line.
   if (!hasLineBreak && !hasFoldableLine) {
     // Strings interpretable as another type have to be quoted;
     // e.g. the string 'true' vs. the boolean true.
     return plain && !testAmbiguousType(string)
       ? STYLE_PLAIN : STYLE_SINGLE;
   }
   // Edge case: block indentation indicator can only have one digit.
   if (indentPerLevel > 9 && needIndentIndicator(string)) {
     return STYLE_DOUBLE;
   }
   // At this point we know block styles are valid.
   // Prefer literal style unless we want to fold.
   return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
 }
 
 // Note: line breaking/folding is implemented for only the folded style.
 // NB. We drop the last trailing newline (if any) of a returned block scalar
 //  since the dumper adds its own newline. This always works:
 //    • No ending newline => unaffected; already using strip "-" chomping.
 //    • Ending newline    => removed then restored.
 //  Importantly, this keeps the "+" chomp indicator from gaining an extra line.
 function writeScalar(state, string, level, iskey) {
   state.dump = (function () {
     if (string.length === 0) {
       return "''";
     }
     if (!state.noCompatMode &&
         DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1) {
       return "'" + string + "'";
     }
 
     var indent = state.indent * Math.max(1, level); // no 0-indent scalars
     // As indentation gets deeper, let the width decrease monotonically
     // to the lower bound min(state.lineWidth, 40).
     // Note that this implies
     //  state.lineWidth ≤ 40 + state.indent: width is fixed at the lower bound.
     //  state.lineWidth > 40 + state.indent: width decreases until the lower bound.
     // This behaves better than a constant minimum width which disallows narrower options,
     // or an indent threshold which causes the width to suddenly increase.
     var lineWidth = state.lineWidth === -1
       ? -1 : Math.max(Math.min(state.lineWidth, 40), state.lineWidth - indent);
 
     // Without knowing if keys are implicit/explicit, assume implicit for safety.
     var singleLineOnly = iskey
       // No block styles in flow mode.
       || (state.flowLevel > -1 && level >= state.flowLevel);
     function testAmbiguity(string) {
       return testImplicitResolving(state, string);
     }
 
     switch (chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth, testAmbiguity)) {
       case STYLE_PLAIN:
         return string;
       case STYLE_SINGLE:
         return "'" + string.replace(/'/g, "''") + "'";
       case STYLE_LITERAL:
         return '|' + blockHeader(string, state.indent)
           + dropEndingNewline(indentString(string, indent));
       case STYLE_FOLDED:
         return '>' + blockHeader(string, state.indent)
           + dropEndingNewline(indentString(foldString(string, lineWidth), indent));
       case STYLE_DOUBLE:
         return '"' + escapeString(string, lineWidth) + '"';
       default:
         throw new YAMLException('impossible error: invalid scalar style');
     }
   }());
 }
 
 // Pre-conditions: string is valid for a block scalar, 1 <= indentPerLevel <= 9.
 function blockHeader(string, indentPerLevel) {
   var indentIndicator = needIndentIndicator(string) ? String(indentPerLevel) : '';
 
   // note the special case: the string '\n' counts as a "trailing" empty line.
   var clip =          string[string.length - 1] === '\n';
   var keep = clip && (string[string.length - 2] === '\n' || string === '\n');
   var chomp = keep ? '+' : (clip ? '' : '-');
 
   return indentIndicator + chomp + '\n';
 }
 
 // (See the note for writeScalar.)
 function dropEndingNewline(string) {
   return string[string.length - 1] === '\n' ? string.slice(0, -1) : string;
 }
 
 // Note: a long line without a suitable break point will exceed the width limit.
 // Pre-conditions: every char in str isPrintable, str.length > 0, width > 0.
 function foldString(string, width) {
   // In folded style, $k$ consecutive newlines output as $k+1$ newlines—
   // unless they're before or after a more-indented line, or at the very
   // beginning or end, in which case $k$ maps to $k$.
   // Therefore, parse each chunk as newline(s) followed by a content line.
   var lineRe = /(\n+)([^\n]*)/g;
 
   // first line (possibly an empty line)
   var result = (function () {
     var nextLF = string.indexOf('\n');
     nextLF = nextLF !== -1 ? nextLF : string.length;
     lineRe.lastIndex = nextLF;
     return foldLine(string.slice(0, nextLF), width);
   }());
   // If we haven't reached the first content line yet, don't add an extra \n.
   var prevMoreIndented = string[0] === '\n' || string[0] === ' ';
   var moreIndented;
 
   // rest of the lines
   var match;
   while ((match = lineRe.exec(string))) {
     var prefix = match[1], line = match[2];
     moreIndented = (line[0] === ' ');
     result += prefix
       + (!prevMoreIndented && !moreIndented && line !== ''
         ? '\n' : '')
       + foldLine(line, width);
     prevMoreIndented = moreIndented;
   }
 
   return result;
 }
 
 // Greedy line breaking.
 // Picks the longest line under the limit each time,
 // otherwise settles for the shortest line over the limit.
 // NB. More-indented lines *cannot* be folded, as that would add an extra \n.
 function foldLine(line, width) {
   if (line === '' || line[0] === ' ') return line;
 
   // Since a more-indented line adds a \n, breaks can't be followed by a space.
   var breakRe = / [^ ]/g; // note: the match index will always be <= length-2.
   var match;
   // start is an inclusive index. end, curr, and next are exclusive.
   var start = 0, end, curr = 0, next = 0;
   var result = '';
 
   // Invariants: 0 <= start <= length-1.
   //   0 <= curr <= next <= max(0, length-2). curr - start <= width.
   // Inside the loop:
   //   A match implies length >= 2, so curr and next are <= length-2.
   while ((match = breakRe.exec(line))) {
     next = match.index;
     // maintain invariant: curr - start <= width
     if (next - start > width) {
       end = (curr > start) ? curr : next; // derive end <= length-2
       result += '\n' + line.slice(start, end);
       // skip the space that was output as \n
       start = end + 1;                    // derive start <= length-1
     }
     curr = next;
   }
 
   // By the invariants, start <= length-1, so there is something left over.
   // It is either the whole string or a part starting from non-whitespace.
   result += '\n';
   // Insert a break if the remainder is too long and there is a break available.
   if (line.length - start > width && curr > start) {
     result += line.slice(start, curr) + '\n' + line.slice(curr + 1);
   } else {
     result += line.slice(start);
   }
 
   return result.slice(1); // drop extra \n joiner
 }
 
 // Escapes a double-quoted string.
 function escapeString(string) {
   var result = '';
   var char, nextChar;
   var escapeSeq;
 
   for (var i = 0; i < string.length; i++) {
     char = string.charCodeAt(i);
     // Check for surrogate pairs (reference Unicode 3.0 section "3.7 Surrogates").
     if (char >= 0xD800 && char <= 0xDBFF/* high surrogate */) {
       nextChar = string.charCodeAt(i + 1);
       if (nextChar >= 0xDC00 && nextChar <= 0xDFFF/* low surrogate */) {
         // Combine the surrogate pair and store it escaped.
         result += encodeHex((char - 0xD800) * 0x400 + nextChar - 0xDC00 + 0x10000);
         // Advance index one extra since we already used that char here.
         i++; continue;
       }
     }
     escapeSeq = ESCAPE_SEQUENCES[char];
     result += !escapeSeq && isPrintable(char)
       ? string[i]
       : escapeSeq || encodeHex(char);
   }
 
   return result;
 }
 
 function writeFlowSequence(state, level, object) {
   var _result = '',
       _tag    = state.tag,
       index,
       length;
 
   for (index = 0, length = object.length; index < length; index += 1) {
     // Write only valid elements.
     if (writeNode(state, level, object[index], false, false)) {
       if (index !== 0) _result += ',' + (!state.condenseFlow ? ' ' : '');
       _result += state.dump;
     }
   }
 
   state.tag = _tag;
   state.dump = '[' + _result + ']';
 }
 
 function writeBlockSequence(state, level, object, compact) {
   var _result = '',
       _tag    = state.tag,
       index,
       length;
 
   for (index = 0, length = object.length; index < length; index += 1) {
     // Write only valid elements.
     if (writeNode(state, level + 1, object[index], true, true)) {
       if (!compact || index !== 0) {
         _result += generateNextLine(state, level);
       }
 
       if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
         _result += '-';
       } else {
         _result += '- ';
       }
 
       _result += state.dump;
     }
   }
 
   state.tag = _tag;
   state.dump = _result || '[]'; // Empty sequence if no valid values.
 }
 
 function writeFlowMapping(state, level, object) {
   var _result       = '',
       _tag          = state.tag,
       objectKeyList = Object.keys(object),
       index,
       length,
       objectKey,
       objectValue,
       pairBuffer;
 
   for (index = 0, length = objectKeyList.length; index < length; index += 1) {
 
     pairBuffer = '';
     if (index !== 0) pairBuffer += ', ';
 
     if (state.condenseFlow) pairBuffer += '"';
 
     objectKey = objectKeyList[index];
     objectValue = object[objectKey];
 
     if (!writeNode(state, level, objectKey, false, false)) {
       continue; // Skip this pair because of invalid key;
     }
 
     if (state.dump.length > 1024) pairBuffer += '? ';
 
     pairBuffer += state.dump + (state.condenseFlow ? '"' : '') + ':' + (state.condenseFlow ? '' : ' ');
 
     if (!writeNode(state, level, objectValue, false, false)) {
       continue; // Skip this pair because of invalid value.
     }
 
     pairBuffer += state.dump;
 
     // Both key and value are valid.
     _result += pairBuffer;
   }
 
   state.tag = _tag;
   state.dump = '{' + _result + '}';
 }
 
 function writeBlockMapping(state, level, object, compact) {
   var _result       = '',
       _tag          = state.tag,
       objectKeyList = Object.keys(object),
       index,
       length,
       objectKey,
       objectValue,
       explicitPair,
       pairBuffer;
 
   // Allow sorting keys so that the output file is deterministic
   if (state.sortKeys === true) {
     // Default sorting
     objectKeyList.sort();
   } else if (typeof state.sortKeys === 'function') {
     // Custom sort function
     objectKeyList.sort(state.sortKeys);
   } else if (state.sortKeys) {
     // Something is wrong
     throw new YAMLException('sortKeys must be a boolean or a function');
   }
 
   for (index = 0, length = objectKeyList.length; index < length; index += 1) {
     pairBuffer = '';
 
     if (!compact || index !== 0) {
       pairBuffer += generateNextLine(state, level);
     }
 
     objectKey = objectKeyList[index];
     objectValue = object[objectKey];
 
     if (!writeNode(state, level + 1, objectKey, true, true, true)) {
       continue; // Skip this pair because of invalid key.
     }
 
     explicitPair = (state.tag !== null && state.tag !== '?') ||
                    (state.dump && state.dump.length > 1024);
 
     if (explicitPair) {
       if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
         pairBuffer += '?';
       } else {
         pairBuffer += '? ';
       }
     }
 
     pairBuffer += state.dump;
 
     if (explicitPair) {
       pairBuffer += generateNextLine(state, level);
     }
 
     if (!writeNode(state, level + 1, objectValue, true, explicitPair)) {
       continue; // Skip this pair because of invalid value.
     }
 
     if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
       pairBuffer += ':';
     } else {
       pairBuffer += ': ';
     }
 
     pairBuffer += state.dump;
 
     // Both key and value are valid.
     _result += pairBuffer;
   }
 
   state.tag = _tag;
   state.dump = _result || '{}'; // Empty mapping if no valid pairs.
 }
 
 function detectType(state, object, explicit) {
   var _result, typeList, index, length, type, style;
 
   typeList = explicit ? state.explicitTypes : state.implicitTypes;
 
   for (index = 0, length = typeList.length; index < length; index += 1) {
     type = typeList[index];
 
     if ((type.instanceOf  || type.predicate) &&
         (!type.instanceOf || ((typeof object === 'object') && (object instanceof type.instanceOf))) &&
         (!type.predicate  || type.predicate(object))) {
 
       state.tag = explicit ? type.tag : '?';
 
       if (type.represent) {
         style = state.styleMap[type.tag] || type.defaultStyle;
 
         if (_toString.call(type.represent) === '[object Function]') {
           _result = type.represent(object, style);
         } else if (_hasOwnProperty.call(type.represent, style)) {
           _result = type.represent[style](object, style);
         } else {
           throw new YAMLException('!<' + type.tag + '> tag resolver accepts not "' + style + '" style');
         }
 
         state.dump = _result;
       }
 
       return true;
     }
   }
 
   return false;
 }
 
 // Serializes `object` and writes it to global `result`.
 // Returns true on success, or false on invalid object.
 //
 function writeNode(state, level, object, block, compact, iskey) {
   state.tag = null;
   state.dump = object;
 
   if (!detectType(state, object, false)) {
     detectType(state, object, true);
   }
 
   var type = _toString.call(state.dump);
 
   if (block) {
     block = (state.flowLevel < 0 || state.flowLevel > level);
   }
 
   var objectOrArray = type === '[object Object]' || type === '[object Array]',
       duplicateIndex,
       duplicate;
 
   if (objectOrArray) {
     duplicateIndex = state.duplicates.indexOf(object);
     duplicate = duplicateIndex !== -1;
   }
 
   if ((state.tag !== null && state.tag !== '?') || duplicate || (state.indent !== 2 && level > 0)) {
     compact = false;
   }
 
   if (duplicate && state.usedDuplicates[duplicateIndex]) {
     state.dump = '*ref_' + duplicateIndex;
   } else {
     if (objectOrArray && duplicate && !state.usedDuplicates[duplicateIndex]) {
       state.usedDuplicates[duplicateIndex] = true;
     }
     if (type === '[object Object]') {
       if (block && (Object.keys(state.dump).length !== 0)) {
         writeBlockMapping(state, level, state.dump, compact);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + state.dump;
         }
       } else {
         writeFlowMapping(state, level, state.dump);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
         }
       }
     } else if (type === '[object Array]') {
       var arrayLevel = (state.noArrayIndent && (level > 0)) ? level - 1 : level;
       if (block && (state.dump.length !== 0)) {
         writeBlockSequence(state, arrayLevel, state.dump, compact);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + state.dump;
         }
       } else {
         writeFlowSequence(state, arrayLevel, state.dump);
         if (duplicate) {
           state.dump = '&ref_' + duplicateIndex + ' ' + state.dump;
         }
       }
     } else if (type === '[object String]') {
       if (state.tag !== '?') {
         writeScalar(state, state.dump, level, iskey);
       }
     } else {
       if (state.skipInvalid) return false;
       throw new YAMLException('unacceptable kind of an object to dump ' + type);
     }
 
     if (state.tag !== null && state.tag !== '?') {
       state.dump = '!<' + state.tag + '> ' + state.dump;
     }
   }
 
   return true;
 }
 
 function getDuplicateReferences(object, state) {
   var objects = [],
       duplicatesIndexes = [],
       index,
       length;
 
   inspectNode(object, objects, duplicatesIndexes);
 
   for (index = 0, length = duplicatesIndexes.length; index < length; index += 1) {
     state.duplicates.push(objects[duplicatesIndexes[index]]);
   }
   state.usedDuplicates = new Array(length);
 }
 
 function inspectNode(object, objects, duplicatesIndexes) {
   var objectKeyList,
       index,
       length;
 
   if (object !== null && typeof object === 'object') {
     index = objects.indexOf(object);
     if (index !== -1) {
       if (duplicatesIndexes.indexOf(index) === -1) {
         duplicatesIndexes.push(index);
       }
     } else {
       objects.push(object);
 
       if (Array.isArray(object)) {
         for (index = 0, length = object.length; index < length; index += 1) {
           inspectNode(object[index], objects, duplicatesIndexes);
         }
       } else {
         objectKeyList = Object.keys(object);
 
         for (index = 0, length = objectKeyList.length; index < length; index += 1) {
           inspectNode(object[objectKeyList[index]], objects, duplicatesIndexes);
         }
       }
     }
   }
 }
 
 function dump(input, options) {
   options = options || {};
 
   var state = new State(options);
 
   if (!state.noRefs) getDuplicateReferences(input, state);
 
   if (writeNode(state, 0, input, true, true)) return state.dump + '\n';
 
   return '';
 }
 
 function safeDump(input, options) {
   return dump(input, common.extend({ schema: DEFAULT_SAFE_SCHEMA }, options));
 }
 
 module.exports.dump     = dump;
 module.exports.safeDump = safeDump;
 
 },{"./common":2,"./exception":4,"./schema/default_full":9,"./schema/default_safe":10}],4:[function(require,module,exports){
 // YAML error class. http://stackoverflow.com/questions/8458984
 //
 'use strict';
 
 function YAMLException(reason, mark) {
   // Super constructor
   Error.call(this);
 
   this.name = 'YAMLException';
   this.reason = reason;
   this.mark = mark;
   this.message = (this.reason || '(unknown reason)') + (this.mark ? ' ' + this.mark.toString() : '');
 
   // Include stack trace in error object
   if (Error.captureStackTrace) {
     // Chrome and NodeJS
     Error.captureStackTrace(this, this.constructor);
   } else {
     // FF, IE 10+ and Safari 6+. Fallback for others
     this.stack = (new Error()).stack || '';
   }
 }
 
 
 // Inherit from Error
 YAMLException.prototype = Object.create(Error.prototype);
 YAMLException.prototype.constructor = YAMLException;
 
 
 YAMLException.prototype.toString = function toString(compact) {
   var result = this.name + ': ';
 
   result += this.reason || '(unknown reason)';
 
   if (!compact && this.mark) {
     result += ' ' + this.mark.toString();
   }
 
   return result;
 };
 
 
 module.exports = YAMLException;
 
 },{}],5:[function(require,module,exports){
 'use strict';
 
 /*eslint-disable max-len,no-use-before-define*/
 
 var common              = require('./common');
 var YAMLException       = require('./exception');
 var Mark                = require('./mark');
 var DEFAULT_SAFE_SCHEMA = require('./schema/default_safe');
 var DEFAULT_FULL_SCHEMA = require('./schema/default_full');
 
 
 var _hasOwnProperty = Object.prototype.hasOwnProperty;
 
 
 var CONTEXT_FLOW_IN   = 1;
 var CONTEXT_FLOW_OUT  = 2;
 var CONTEXT_BLOCK_IN  = 3;
 var CONTEXT_BLOCK_OUT = 4;
 
 
 var CHOMPING_CLIP  = 1;
 var CHOMPING_STRIP = 2;
 var CHOMPING_KEEP  = 3;
 
 
 var PATTERN_NON_PRINTABLE         = /[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x84\x86-\x9F\uFFFE\uFFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]/;
 var PATTERN_NON_ASCII_LINE_BREAKS = /[\x85\u2028\u2029]/;
 var PATTERN_FLOW_INDICATORS       = /[,\[\]\{\}]/;
 var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z\-]+!)$/i;
 var PATTERN_TAG_URI               = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
 
 
 function _class(obj) { return Object.prototype.toString.call(obj); }
 
 function is_EOL(c) {
   return (c === 0x0A/* LF */) || (c === 0x0D/* CR */);
 }
 
 function is_WHITE_SPACE(c) {
   return (c === 0x09/* Tab */) || (c === 0x20/* Space */);
 }
 
 function is_WS_OR_EOL(c) {
   return (c === 0x09/* Tab */) ||
          (c === 0x20/* Space */) ||
          (c === 0x0A/* LF */) ||
          (c === 0x0D/* CR */);
 }
 
 function is_FLOW_INDICATOR(c) {
   return c === 0x2C/* , */ ||
          c === 0x5B/* [ */ ||
          c === 0x5D/* ] */ ||
          c === 0x7B/* { */ ||
          c === 0x7D/* } */;
 }
 
 function fromHexCode(c) {
   var lc;
 
   if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
     return c - 0x30;
   }
 
   /*eslint-disable no-bitwise*/
   lc = c | 0x20;
 
   if ((0x61/* a */ <= lc) && (lc <= 0x66/* f */)) {
     return lc - 0x61 + 10;
   }
 
   return -1;
 }
 
 function escapedHexLen(c) {
   if (c === 0x78/* x */) { return 2; }
   if (c === 0x75/* u */) { return 4; }
   if (c === 0x55/* U */) { return 8; }
   return 0;
 }
 
 function fromDecimalCode(c) {
   if ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) {
     return c - 0x30;
   }
 
   return -1;
 }
 
 function simpleEscapeSequence(c) {
   /* eslint-disable indent */
   return (c === 0x30/* 0 */) ? '\x00' :
         (c === 0x61/* a */) ? '\x07' :
         (c === 0x62/* b */) ? '\x08' :
         (c === 0x74/* t */) ? '\x09' :
         (c === 0x09/* Tab */) ? '\x09' :
         (c === 0x6E/* n */) ? '\x0A' :
         (c === 0x76/* v */) ? '\x0B' :
         (c === 0x66/* f */) ? '\x0C' :
         (c === 0x72/* r */) ? '\x0D' :
         (c === 0x65/* e */) ? '\x1B' :
         (c === 0x20/* Space */) ? ' ' :
         (c === 0x22/* " */) ? '\x22' :
         (c === 0x2F/* / */) ? '/' :
         (c === 0x5C/* \ */) ? '\x5C' :
         (c === 0x4E/* N */) ? '\x85' :
         (c === 0x5F/* _ */) ? '\xA0' :
         (c === 0x4C/* L */) ? '\u2028' :
         (c === 0x50/* P */) ? '\u2029' : '';
 }
 
 function charFromCodepoint(c) {
   if (c <= 0xFFFF) {
     return String.fromCharCode(c);
   }
   // Encode UTF-16 surrogate pair
   // https://en.wikipedia.org/wiki/UTF-16#Code_points_U.2B010000_to_U.2B10FFFF
   return String.fromCharCode(
     ((c - 0x010000) >> 10) + 0xD800,
     ((c - 0x010000) & 0x03FF) + 0xDC00
   );
 }
 
 var simpleEscapeCheck = new Array(256); // integer, for fast access
 var simpleEscapeMap = new Array(256);
 for (var i = 0; i < 256; i++) {
   simpleEscapeCheck[i] = simpleEscapeSequence(i) ? 1 : 0;
   simpleEscapeMap[i] = simpleEscapeSequence(i);
 }
 
 
 function State(input, options) {
   this.input = input;
 
   this.filename  = options['filename']  || null;
   this.schema    = options['schema']    || DEFAULT_FULL_SCHEMA;
   this.onWarning = options['onWarning'] || null;
   this.legacy    = options['legacy']    || false;
   this.json      = options['json']      || false;
   this.listener  = options['listener']  || null;
 
   this.implicitTypes = this.schema.compiledImplicit;
   this.typeMap       = this.schema.compiledTypeMap;
 
   this.length     = input.length;
   this.position   = 0;
   this.line       = 0;
   this.lineStart  = 0;
   this.lineIndent = 0;
 
   this.documents = [];
 
   /*
   this.version;
   this.checkLineBreaks;
   this.tagMap;
   this.anchorMap;
   this.tag;
   this.anchor;
   this.kind;
   this.result;*/
 
 }
 
 
 function generateError(state, message) {
   return new YAMLException(
     message,
     new Mark(state.filename, state.input, state.position, state.line, (state.position - state.lineStart)));
 }
 
 function throwError(state, message) {
   throw generateError(state, message);
 }
 
 function throwWarning(state, message) {
   if (state.onWarning) {
     state.onWarning.call(null, generateError(state, message));
   }
 }
 
 
 var directiveHandlers = {
 
   YAML: function handleYamlDirective(state, name, args) {
 
     var match, major, minor;
 
     if (state.version !== null) {
       throwError(state, 'duplication of %YAML directive');
     }
 
     if (args.length !== 1) {
       throwError(state, 'YAML directive accepts exactly one argument');
     }
 
     match = /^([0-9]+)\.([0-9]+)$/.exec(args[0]);
 
     if (match === null) {
       throwError(state, 'ill-formed argument of the YAML directive');
     }
 
     major = parseInt(match[1], 10);
     minor = parseInt(match[2], 10);
 
     if (major !== 1) {
       throwError(state, 'unacceptable YAML version of the document');
     }
 
     state.version = args[0];
     state.checkLineBreaks = (minor < 2);
 
     if (minor !== 1 && minor !== 2) {
       throwWarning(state, 'unsupported YAML version of the document');
     }
   },
 
   TAG: function handleTagDirective(state, name, args) {
 
     var handle, prefix;
 
     if (args.length !== 2) {
       throwError(state, 'TAG directive accepts exactly two arguments');
     }
 
     handle = args[0];
     prefix = args[1];
 
     if (!PATTERN_TAG_HANDLE.test(handle)) {
       throwError(state, 'ill-formed tag handle (first argument) of the TAG directive');
     }
 
     if (_hasOwnProperty.call(state.tagMap, handle)) {
       throwError(state, 'there is a previously declared suffix for "' + handle + '" tag handle');
     }
 
     if (!PATTERN_TAG_URI.test(prefix)) {
       throwError(state, 'ill-formed tag prefix (second argument) of the TAG directive');
     }
 
     state.tagMap[handle] = prefix;
   }
 };
 
 
 function captureSegment(state, start, end, checkJson) {
   var _position, _length, _character, _result;
 
   if (start < end) {
     _result = state.input.slice(start, end);
 
     if (checkJson) {
       for (_position = 0, _length = _result.length; _position < _length; _position += 1) {
         _character = _result.charCodeAt(_position);
         if (!(_character === 0x09 ||
               (0x20 <= _character && _character <= 0x10FFFF))) {
           throwError(state, 'expected valid JSON character');
         }
       }
     } else if (PATTERN_NON_PRINTABLE.test(_result)) {
       throwError(state, 'the stream contains non-printable characters');
     }
 
     state.result += _result;
   }
 }
 
 function mergeMappings(state, destination, source, overridableKeys) {
   var sourceKeys, key, index, quantity;
 
   if (!common.isObject(source)) {
     throwError(state, 'cannot merge mappings; the provided source object is unacceptable');
   }
 
   sourceKeys = Object.keys(source);
 
   for (index = 0, quantity = sourceKeys.length; index < quantity; index += 1) {
     key = sourceKeys[index];
 
     if (!_hasOwnProperty.call(destination, key)) {
       destination[key] = source[key];
       overridableKeys[key] = true;
     }
   }
 }
 
 function storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, startLine, startPos) {
   var index, quantity;
 
   // The output is a plain object here, so keys can only be strings.
   // We need to convert keyNode to a string, but doing so can hang the process
   // (deeply nested arrays that explode exponentially using aliases).
   if (Array.isArray(keyNode)) {
     keyNode = Array.prototype.slice.call(keyNode);
 
     for (index = 0, quantity = keyNode.length; index < quantity; index += 1) {
       if (Array.isArray(keyNode[index])) {
         throwError(state, 'nested arrays are not supported inside keys');
       }
 
       if (typeof keyNode === 'object' && _class(keyNode[index]) === '[object Object]') {
         keyNode[index] = '[object Object]';
       }
     }
   }
 
   // Avoid code execution in load() via toString property
   // (still use its own toString for arrays, timestamps,
   // and whatever user schema extensions happen to have @@toStringTag)
   if (typeof keyNode === 'object' && _class(keyNode) === '[object Object]') {
     keyNode = '[object Object]';
   }
 
 
   keyNode = String(keyNode);
 
   if (_result === null) {
     _result = {};
   }
 
   if (keyTag === 'tag:yaml.org,2002:merge') {
     if (Array.isArray(valueNode)) {
       for (index = 0, quantity = valueNode.length; index < quantity; index += 1) {
         mergeMappings(state, _result, valueNode[index], overridableKeys);
       }
     } else {
       mergeMappings(state, _result, valueNode, overridableKeys);
     }
   } else {
     if (!state.json &&
         !_hasOwnProperty.call(overridableKeys, keyNode) &&
         _hasOwnProperty.call(_result, keyNode)) {
       state.line = startLine || state.line;
       state.position = startPos || state.position;
       throwError(state, 'duplicated mapping key');
     }
     _result[keyNode] = valueNode;
     delete overridableKeys[keyNode];
   }
 
   return _result;
 }
 
 function readLineBreak(state) {
   var ch;
 
   ch = state.input.charCodeAt(state.position);
 
   if (ch === 0x0A/* LF */) {
     state.position++;
   } else if (ch === 0x0D/* CR */) {
     state.position++;
     if (state.input.charCodeAt(state.position) === 0x0A/* LF */) {
       state.position++;
     }
   } else {
     throwError(state, 'a line break is expected');
   }
 
   state.line += 1;
   state.lineStart = state.position;
 }
 
 function skipSeparationSpace(state, allowComments, checkIndent) {
   var lineBreaks = 0,
       ch = state.input.charCodeAt(state.position);
 
   while (ch !== 0) {
     while (is_WHITE_SPACE(ch)) {
       ch = state.input.charCodeAt(++state.position);
     }
 
     if (allowComments && ch === 0x23/* # */) {
       do {
         ch = state.input.charCodeAt(++state.position);
       } while (ch !== 0x0A/* LF */ && ch !== 0x0D/* CR */ && ch !== 0);
     }
 
     if (is_EOL(ch)) {
       readLineBreak(state);
 
       ch = state.input.charCodeAt(state.position);
       lineBreaks++;
       state.lineIndent = 0;
 
       while (ch === 0x20/* Space */) {
         state.lineIndent++;
         ch = state.input.charCodeAt(++state.position);
       }
     } else {
       break;
     }
   }
 
   if (checkIndent !== -1 && lineBreaks !== 0 && state.lineIndent < checkIndent) {
     throwWarning(state, 'deficient indentation');
   }
 
   return lineBreaks;
 }
 
 function testDocumentSeparator(state) {
   var _position = state.position,
       ch;
 
   ch = state.input.charCodeAt(_position);
 
   // Condition state.position === state.lineStart is tested
   // in parent on each call, for efficiency. No needs to test here again.
   if ((ch === 0x2D/* - */ || ch === 0x2E/* . */) &&
       ch === state.input.charCodeAt(_position + 1) &&
       ch === state.input.charCodeAt(_position + 2)) {
 
     _position += 3;
 
     ch = state.input.charCodeAt(_position);
 
     if (ch === 0 || is_WS_OR_EOL(ch)) {
       return true;
     }
   }
 
   return false;
 }
 
 function writeFoldedLines(state, count) {
   if (count === 1) {
     state.result += ' ';
   } else if (count > 1) {
     state.result += common.repeat('\n', count - 1);
   }
 }
 
 
 function readPlainScalar(state, nodeIndent, withinFlowCollection) {
   var preceding,
       following,
       captureStart,
       captureEnd,
       hasPendingContent,
       _line,
       _lineStart,
       _lineIndent,
       _kind = state.kind,
       _result = state.result,
       ch;
 
   ch = state.input.charCodeAt(state.position);
 
   if (is_WS_OR_EOL(ch)      ||
       is_FLOW_INDICATOR(ch) ||
       ch === 0x23/* # */    ||
       ch === 0x26/* & */    ||
       ch === 0x2A/* * */    ||
       ch === 0x21/* ! */    ||
       ch === 0x7C/* | */    ||
       ch === 0x3E/* > */    ||
       ch === 0x27/* ' */    ||
       ch === 0x22/* " */    ||
       ch === 0x25/* % */    ||
       ch === 0x40/* @ */    ||
       ch === 0x60/* ` */) {
     return false;
   }
 
   if (ch === 0x3F/* ? */ || ch === 0x2D/* - */) {
     following = state.input.charCodeAt(state.position + 1);
 
     if (is_WS_OR_EOL(following) ||
         withinFlowCollection && is_FLOW_INDICATOR(following)) {
       return false;
     }
   }
 
   state.kind = 'scalar';
   state.result = '';
   captureStart = captureEnd = state.position;
   hasPendingContent = false;
 
   while (ch !== 0) {
     if (ch === 0x3A/* : */) {
       following = state.input.charCodeAt(state.position + 1);
 
       if (is_WS_OR_EOL(following) ||
           withinFlowCollection && is_FLOW_INDICATOR(following)) {
         break;
       }
 
     } else if (ch === 0x23/* # */) {
       preceding = state.input.charCodeAt(state.position - 1);
 
       if (is_WS_OR_EOL(preceding)) {
         break;
       }
 
     } else if ((state.position === state.lineStart && testDocumentSeparator(state)) ||
                withinFlowCollection && is_FLOW_INDICATOR(ch)) {
       break;
 
     } else if (is_EOL(ch)) {
       _line = state.line;
       _lineStart = state.lineStart;
       _lineIndent = state.lineIndent;
       skipSeparationSpace(state, false, -1);
 
       if (state.lineIndent >= nodeIndent) {
         hasPendingContent = true;
         ch = state.input.charCodeAt(state.position);
         continue;
       } else {
         state.position = captureEnd;
         state.line = _line;
         state.lineStart = _lineStart;
         state.lineIndent = _lineIndent;
         break;
       }
     }
 
     if (hasPendingContent) {
       captureSegment(state, captureStart, captureEnd, false);
       writeFoldedLines(state, state.line - _line);
       captureStart = captureEnd = state.position;
       hasPendingContent = false;
     }
 
     if (!is_WHITE_SPACE(ch)) {
       captureEnd = state.position + 1;
     }
 
     ch = state.input.charCodeAt(++state.position);
   }
 
   captureSegment(state, captureStart, captureEnd, false);
 
   if (state.result) {
     return true;
   }
 
   state.kind = _kind;
   state.result = _result;
   return false;
 }
 
 function readSingleQuotedScalar(state, nodeIndent) {
   var ch,
       captureStart, captureEnd;
 
   ch = state.input.charCodeAt(state.position);
 
   if (ch !== 0x27/* ' */) {
     return false;
   }
 
   state.kind = 'scalar';
   state.result = '';
   state.position++;
   captureStart = captureEnd = state.position;
 
   while ((ch = state.input.charCodeAt(state.position)) !== 0) {
     if (ch === 0x27/* ' */) {
       captureSegment(state, captureStart, state.position, true);
       ch = state.input.charCodeAt(++state.position);
 
       if (ch === 0x27/* ' */) {
         captureStart = state.position;
         state.position++;
         captureEnd = state.position;
       } else {
         return true;
       }
 
     } else if (is_EOL(ch)) {
       captureSegment(state, captureStart, captureEnd, true);
       writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
       captureStart = captureEnd = state.position;
 
     } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
       throwError(state, 'unexpected end of the document within a single quoted scalar');
 
     } else {
       state.position++;
       captureEnd = state.position;
     }
   }
 
   throwError(state, 'unexpected end of the stream within a single quoted scalar');
 }
 
 function readDoubleQuotedScalar(state, nodeIndent) {
   var captureStart,
       captureEnd,
       hexLength,
       hexResult,
       tmp,
       ch;
 
   ch = state.input.charCodeAt(state.position);
 
   if (ch !== 0x22/* " */) {
     return false;
   }
 
   state.kind = 'scalar';
   state.result = '';
   state.position++;
   captureStart = captureEnd = state.position;
 
   while ((ch = state.input.charCodeAt(state.position)) !== 0) {
     if (ch === 0x22/* " */) {
       captureSegment(state, captureStart, state.position, true);
       state.position++;
       return true;
 
     } else if (ch === 0x5C/* \ */) {
       captureSegment(state, captureStart, state.position, true);
       ch = state.input.charCodeAt(++state.position);
 
       if (is_EOL(ch)) {
         skipSeparationSpace(state, false, nodeIndent);
 
         // TODO: rework to inline fn with no type cast?
       } else if (ch < 256 && simpleEscapeCheck[ch]) {
         state.result += simpleEscapeMap[ch];
         state.position++;
 
       } else if ((tmp = escapedHexLen(ch)) > 0) {
         hexLength = tmp;
         hexResult = 0;
 
         for (; hexLength > 0; hexLength--) {
           ch = state.input.charCodeAt(++state.position);
 
           if ((tmp = fromHexCode(ch)) >= 0) {
             hexResult = (hexResult << 4) + tmp;
 
           } else {
             throwError(state, 'expected hexadecimal character');
           }
         }
 
         state.result += charFromCodepoint(hexResult);
 
         state.position++;
 
       } else {
         throwError(state, 'unknown escape sequence');
       }
 
       captureStart = captureEnd = state.position;
 
     } else if (is_EOL(ch)) {
       captureSegment(state, captureStart, captureEnd, true);
       writeFoldedLines(state, skipSeparationSpace(state, false, nodeIndent));
       captureStart = captureEnd = state.position;
 
     } else if (state.position === state.lineStart && testDocumentSeparator(state)) {
       throwError(state, 'unexpected end of the document within a double quoted scalar');
 
     } else {
       state.position++;
       captureEnd = state.position;
     }
   }
 
   throwError(state, 'unexpected end of the stream within a double quoted scalar');
 }
 
 function readFlowCollection(state, nodeIndent) {
   var readNext = true,
       _line,
       _tag     = state.tag,
       _result,
       _anchor  = state.anchor,
       following,
       terminator,
       isPair,
       isExplicitPair,
       isMapping,
       overridableKeys = {},
       keyNode,
       keyTag,
       valueNode,
       ch;
 
   ch = state.input.charCodeAt(state.position);
 
   if (ch === 0x5B/* [ */) {
     terminator = 0x5D;/* ] */
     isMapping = false;
     _result = [];
   } else if (ch === 0x7B/* { */) {
     terminator = 0x7D;/* } */
     isMapping = true;
     _result = {};
   } else {
     return false;
   }
 
   if (state.anchor !== null) {
     state.anchorMap[state.anchor] = _result;
   }
 
   ch = state.input.charCodeAt(++state.position);
 
   while (ch !== 0) {
     skipSeparationSpace(state, true, nodeIndent);
 
     ch = state.input.charCodeAt(state.position);
 
     if (ch === terminator) {
       state.position++;
       state.tag = _tag;
       state.anchor = _anchor;
       state.kind = isMapping ? 'mapping' : 'sequence';
       state.result = _result;
       return true;
     } else if (!readNext) {
       throwError(state, 'missed comma between flow collection entries');
     }
 
     keyTag = keyNode = valueNode = null;
     isPair = isExplicitPair = false;
 
     if (ch === 0x3F/* ? */) {
       following = state.input.charCodeAt(state.position + 1);
 
       if (is_WS_OR_EOL(following)) {
         isPair = isExplicitPair = true;
         state.position++;
         skipSeparationSpace(state, true, nodeIndent);
       }
     }
 
     _line = state.line;
     composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
     keyTag = state.tag;
     keyNode = state.result;
     skipSeparationSpace(state, true, nodeIndent);
 
     ch = state.input.charCodeAt(state.position);
 
     if ((isExplicitPair || state.line === _line) && ch === 0x3A/* : */) {
       isPair = true;
       ch = state.input.charCodeAt(++state.position);
       skipSeparationSpace(state, true, nodeIndent);
       composeNode(state, nodeIndent, CONTEXT_FLOW_IN, false, true);
       valueNode = state.result;
     }
 
     if (isMapping) {
       storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode);
     } else if (isPair) {
       _result.push(storeMappingPair(state, null, overridableKeys, keyTag, keyNode, valueNode));
     } else {
       _result.push(keyNode);
     }
 
     skipSeparationSpace(state, true, nodeIndent);
 
     ch = state.input.charCodeAt(state.position);
 
     if (ch === 0x2C/* , */) {
       readNext = true;
       ch = state.input.charCodeAt(++state.position);
     } else {
       readNext = false;
     }
   }
 
   throwError(state, 'unexpected end of the stream within a flow collection');
 }
 
 function readBlockScalar(state, nodeIndent) {
   var captureStart,
       folding,
       chomping       = CHOMPING_CLIP,
       didReadContent = false,
       detectedIndent = false,
       textIndent     = nodeIndent,
       emptyLines     = 0,
       atMoreIndented = false,
       tmp,
       ch;
 
   ch = state.input.charCodeAt(state.position);
 
   if (ch === 0x7C/* | */) {
     folding = false;
   } else if (ch === 0x3E/* > */) {
     folding = true;
   } else {
     return false;
   }
 
   state.kind = 'scalar';
   state.result = '';
 
   while (ch !== 0) {
     ch = state.input.charCodeAt(++state.position);
 
     if (ch === 0x2B/* + */ || ch === 0x2D/* - */) {
       if (CHOMPING_CLIP === chomping) {
         chomping = (ch === 0x2B/* + */) ? CHOMPING_KEEP : CHOMPING_STRIP;
       } else {
         throwError(state, 'repeat of a chomping mode identifier');
       }
 
     } else if ((tmp = fromDecimalCode(ch)) >= 0) {
       if (tmp === 0) {
         throwError(state, 'bad explicit indentation width of a block scalar; it cannot be less than one');
       } else if (!detectedIndent) {
         textIndent = nodeIndent + tmp - 1;
         detectedIndent = true;
       } else {
         throwError(state, 'repeat of an indentation width identifier');
       }
 
     } else {
       break;
     }
   }
 
   if (is_WHITE_SPACE(ch)) {
     do { ch = state.input.charCodeAt(++state.position); }
     while (is_WHITE_SPACE(ch));
 
     if (ch === 0x23/* # */) {
       do { ch = state.input.charCodeAt(++state.position); }
       while (!is_EOL(ch) && (ch !== 0));
     }
   }
 
   while (ch !== 0) {
     readLineBreak(state);
     state.lineIndent = 0;
 
     ch = state.input.charCodeAt(state.position);
 
     while ((!detectedIndent || state.lineIndent < textIndent) &&
            (ch === 0x20/* Space */)) {
       state.lineIndent++;
       ch = state.input.charCodeAt(++state.position);
     }
 
     if (!detectedIndent && state.lineIndent > textIndent) {
       textIndent = state.lineIndent;
     }
 
     if (is_EOL(ch)) {
       emptyLines++;
       continue;
     }
 
     // End of the scalar.
     if (state.lineIndent < textIndent) {
 
       // Perform the chomping.
       if (chomping === CHOMPING_KEEP) {
         state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
       } else if (chomping === CHOMPING_CLIP) {
         if (didReadContent) { // i.e. only if the scalar is not empty.
           state.result += '\n';
         }
       }
 
       // Break this `while` cycle and go to the funciton's epilogue.
       break;
     }
 
     // Folded style: use fancy rules to handle line breaks.
     if (folding) {
 
       // Lines starting with white space characters (more-indented lines) are not folded.
       if (is_WHITE_SPACE(ch)) {
         atMoreIndented = true;
         // except for the first content line (cf. Example 8.1)
         state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
 
       // End of more-indented block.
       } else if (atMoreIndented) {
         atMoreIndented = false;
         state.result += common.repeat('\n', emptyLines + 1);
 
       // Just one line break - perceive as the same line.
       } else if (emptyLines === 0) {
         if (didReadContent) { // i.e. only if we have already read some scalar content.
           state.result += ' ';
         }
 
       // Several line breaks - perceive as different lines.
       } else {
         state.result += common.repeat('\n', emptyLines);
       }
 
     // Literal style: just add exact number of line breaks between content lines.
     } else {
       // Keep all line breaks except the header line break.
       state.result += common.repeat('\n', didReadContent ? 1 + emptyLines : emptyLines);
     }
 
     didReadContent = true;
     detectedIndent = true;
     emptyLines = 0;
     captureStart = state.position;
 
     while (!is_EOL(ch) && (ch !== 0)) {
       ch = state.input.charCodeAt(++state.position);
     }
 
     captureSegment(state, captureStart, state.position, false);
   }
 
   return true;
 }
 
 function readBlockSequence(state, nodeIndent) {
   var _line,
       _tag      = state.tag,
       _anchor   = state.anchor,
       _result   = [],
       following,
       detected  = false,
       ch;
 
   if (state.anchor !== null) {
     state.anchorMap[state.anchor] = _result;
   }
 
   ch = state.input.charCodeAt(state.position);
 
   while (ch !== 0) {
 
     if (ch !== 0x2D/* - */) {
       break;
     }
 
     following = state.input.charCodeAt(state.position + 1);
 
     if (!is_WS_OR_EOL(following)) {
       break;
     }
 
     detected = true;
     state.position++;
 
     if (skipSeparationSpace(state, true, -1)) {
       if (state.lineIndent <= nodeIndent) {
         _result.push(null);
         ch = state.input.charCodeAt(state.position);
         continue;
       }
     }
 
     _line = state.line;
     composeNode(state, nodeIndent, CONTEXT_BLOCK_IN, false, true);
     _result.push(state.result);
     skipSeparationSpace(state, true, -1);
 
     ch = state.input.charCodeAt(state.position);
 
     if ((state.line === _line || state.lineIndent > nodeIndent) && (ch !== 0)) {
       throwError(state, 'bad indentation of a sequence entry');
     } else if (state.lineIndent < nodeIndent) {
       break;
     }
   }
 
   if (detected) {
     state.tag = _tag;
     state.anchor = _anchor;
     state.kind = 'sequence';
     state.result = _result;
     return true;
   }
   return false;
 }
 
 function readBlockMapping(state, nodeIndent, flowIndent) {
   var following,
       allowCompact,
       _line,
       _pos,
       _tag          = state.tag,
       _anchor       = state.anchor,
       _result       = {},
       overridableKeys = {},
       keyTag        = null,
       keyNode       = null,
       valueNode     = null,
       atExplicitKey = false,
       detected      = false,
       ch;
 
   if (state.anchor !== null) {
     state.anchorMap[state.anchor] = _result;
   }
 
   ch = state.input.charCodeAt(state.position);
 
   while (ch !== 0) {
     following = state.input.charCodeAt(state.position + 1);
     _line = state.line; // Save the current line.
     _pos = state.position;
 
     //
     // Explicit notation case. There are two separate blocks:
     // first for the key (denoted by "?") and second for the value (denoted by ":")
     //
     if ((ch === 0x3F/* ? */ || ch === 0x3A/* : */) && is_WS_OR_EOL(following)) {
 
       if (ch === 0x3F/* ? */) {
         if (atExplicitKey) {
           storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
           keyTag = keyNode = valueNode = null;
         }
 
         detected = true;
         atExplicitKey = true;
         allowCompact = true;
 
       } else if (atExplicitKey) {
         // i.e. 0x3A/* : */ === character after the explicit key.
         atExplicitKey = false;
         allowCompact = true;
 
       } else {
         throwError(state, 'incomplete explicit mapping pair; a key node is missed; or followed by a non-tabulated empty line');
       }
 
       state.position += 1;
       ch = following;
 
     //
     // Implicit notation case. Flow-style node as the key first, then ":", and the value.
     //
     } else if (composeNode(state, flowIndent, CONTEXT_FLOW_OUT, false, true)) {
 
       if (state.line === _line) {
         ch = state.input.charCodeAt(state.position);
 
         while (is_WHITE_SPACE(ch)) {
           ch = state.input.charCodeAt(++state.position);
         }
 
         if (ch === 0x3A/* : */) {
           ch = state.input.charCodeAt(++state.position);
 
           if (!is_WS_OR_EOL(ch)) {
             throwError(state, 'a whitespace character is expected after the key-value separator within a block mapping');
           }
 
           if (atExplicitKey) {
             storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
             keyTag = keyNode = valueNode = null;
           }
 
           detected = true;
           atExplicitKey = false;
           allowCompact = false;
           keyTag = state.tag;
           keyNode = state.result;
 
         } else if (detected) {
           throwError(state, 'can not read an implicit mapping pair; a colon is missed');
 
         } else {
           state.tag = _tag;
           state.anchor = _anchor;
           return true; // Keep the result of `composeNode`.
         }
 
       } else if (detected) {
         throwError(state, 'can not read a block mapping entry; a multiline key may not be an implicit key');
 
       } else {
         state.tag = _tag;
         state.anchor = _anchor;
         return true; // Keep the result of `composeNode`.
       }
 
     } else {
       break; // Reading is done. Go to the epilogue.
     }
 
     //
     // Common reading code for both explicit and implicit notations.
     //
     if (state.line === _line || state.lineIndent > nodeIndent) {
       if (composeNode(state, nodeIndent, CONTEXT_BLOCK_OUT, true, allowCompact)) {
         if (atExplicitKey) {
           keyNode = state.result;
         } else {
           valueNode = state.result;
         }
       }
 
       if (!atExplicitKey) {
         storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, valueNode, _line, _pos);
         keyTag = keyNode = valueNode = null;
       }
 
       skipSeparationSpace(state, true, -1);
       ch = state.input.charCodeAt(state.position);
     }
 
     if (state.lineIndent > nodeIndent && (ch !== 0)) {
       throwError(state, 'bad indentation of a mapping entry');
     } else if (state.lineIndent < nodeIndent) {
       break;
     }
   }
 
   //
   // Epilogue.
   //
 
   // Special case: last mapping's node contains only the key in explicit notation.
   if (atExplicitKey) {
     storeMappingPair(state, _result, overridableKeys, keyTag, keyNode, null);
   }
 
   // Expose the resulting mapping.
   if (detected) {
     state.tag = _tag;
     state.anchor = _anchor;
     state.kind = 'mapping';
     state.result = _result;
   }
 
   return detected;
 }
 
 function readTagProperty(state) {
   var _position,
       isVerbatim = false,
       isNamed    = false,
       tagHandle,
       tagName,
       ch;
 
   ch = state.input.charCodeAt(state.position);
 
   if (ch !== 0x21/* ! */) return false;
 
   if (state.tag !== null) {
     throwError(state, 'duplication of a tag property');
   }
 
   ch = state.input.charCodeAt(++state.position);
 
   if (ch === 0x3C/* < */) {
     isVerbatim = true;
     ch = state.input.charCodeAt(++state.position);
 
   } else if (ch === 0x21/* ! */) {
     isNamed = true;
     tagHandle = '!!';
     ch = state.input.charCodeAt(++state.position);
 
   } else {
     tagHandle = '!';
   }
 
   _position = state.position;
 
   if (isVerbatim) {
     do { ch = state.input.charCodeAt(++state.position); }
     while (ch !== 0 && ch !== 0x3E/* > */);
 
     if (state.position < state.length) {
       tagName = state.input.slice(_position, state.position);
       ch = state.input.charCodeAt(++state.position);
     } else {
       throwError(state, 'unexpected end of the stream within a verbatim tag');
     }
   } else {
     while (ch !== 0 && !is_WS_OR_EOL(ch)) {
 
       if (ch === 0x21/* ! */) {
         if (!isNamed) {
           tagHandle = state.input.slice(_position - 1, state.position + 1);
 
           if (!PATTERN_TAG_HANDLE.test(tagHandle)) {
             throwError(state, 'named tag handle cannot contain such characters');
           }
 
           isNamed = true;
           _position = state.position + 1;
         } else {
           throwError(state, 'tag suffix cannot contain exclamation marks');
         }
       }
 
       ch = state.input.charCodeAt(++state.position);
     }
 
     tagName = state.input.slice(_position, state.position);
 
     if (PATTERN_FLOW_INDICATORS.test(tagName)) {
       throwError(state, 'tag suffix cannot contain flow indicator characters');
     }
   }
 
   if (tagName && !PATTERN_TAG_URI.test(tagName)) {
     throwError(state, 'tag name cannot contain such characters: ' + tagName);
   }
 
   if (isVerbatim) {
     state.tag = tagName;
 
   } else if (_hasOwnProperty.call(state.tagMap, tagHandle)) {
     state.tag = state.tagMap[tagHandle] + tagName;
 
   } else if (tagHandle === '!') {
     state.tag = '!' + tagName;
 
   } else if (tagHandle === '!!') {
     state.tag = 'tag:yaml.org,2002:' + tagName;
 
   } else {
     throwError(state, 'undeclared tag handle "' + tagHandle + '"');
   }
 
   return true;
 }
 
 function readAnchorProperty(state) {
   var _position,
       ch;
 
   ch = state.input.charCodeAt(state.position);
 
   if (ch !== 0x26/* & */) return false;
 
   if (state.anchor !== null) {
     throwError(state, 'duplication of an anchor property');
   }
 
   ch = state.input.charCodeAt(++state.position);
   _position = state.position;
 
   while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
     ch = state.input.charCodeAt(++state.position);
   }
 
   if (state.position === _position) {
     throwError(state, 'name of an anchor node must contain at least one character');
   }
 
   state.anchor = state.input.slice(_position, state.position);
   return true;
 }
 
 function readAlias(state) {
   var _position, alias,
       ch;
 
   ch = state.input.charCodeAt(state.position);
 
   if (ch !== 0x2A/* * */) return false;
 
   ch = state.input.charCodeAt(++state.position);
   _position = state.position;
 
   while (ch !== 0 && !is_WS_OR_EOL(ch) && !is_FLOW_INDICATOR(ch)) {
     ch = state.input.charCodeAt(++state.position);
   }
 
   if (state.position === _position) {
     throwError(state, 'name of an alias node must contain at least one character');
   }
 
   alias = state.input.slice(_position, state.position);
 
   if (!state.anchorMap.hasOwnProperty(alias)) {
     throwError(state, 'unidentified alias "' + alias + '"');
   }
 
   state.result = state.anchorMap[alias];
   skipSeparationSpace(state, true, -1);
   return true;
 }
 
 function composeNode(state, parentIndent, nodeContext, allowToSeek, allowCompact) {
   var allowBlockStyles,
       allowBlockScalars,
       allowBlockCollections,
       indentStatus = 1, // 1: this>parent, 0: this=parent, -1: this<parent
       atNewLine  = false,
       hasContent = false,
       typeIndex,
       typeQuantity,
       type,
       flowIndent,
       blockIndent;
 
   if (state.listener !== null) {
     state.listener('open', state);
   }
 
   state.tag    = null;
   state.anchor = null;
   state.kind   = null;
   state.result = null;
 
   allowBlockStyles = allowBlockScalars = allowBlockCollections =
     CONTEXT_BLOCK_OUT === nodeContext ||
     CONTEXT_BLOCK_IN  === nodeContext;
 
   if (allowToSeek) {
     if (skipSeparationSpace(state, true, -1)) {
       atNewLine = true;
 
       if (state.lineIndent > parentIndent) {
         indentStatus = 1;
       } else if (state.lineIndent === parentIndent) {
         indentStatus = 0;
       } else if (state.lineIndent < parentIndent) {
         indentStatus = -1;
       }
     }
   }
 
   if (indentStatus === 1) {
     while (readTagProperty(state) || readAnchorProperty(state)) {
       if (skipSeparationSpace(state, true, -1)) {
         atNewLine = true;
         allowBlockCollections = allowBlockStyles;
 
         if (state.lineIndent > parentIndent) {
           indentStatus = 1;
         } else if (state.lineIndent === parentIndent) {
           indentStatus = 0;
         } else if (state.lineIndent < parentIndent) {
           indentStatus = -1;
         }
       } else {
         allowBlockCollections = false;
       }
     }
   }
 
   if (allowBlockCollections) {
     allowBlockCollections = atNewLine || allowCompact;
   }
 
   if (indentStatus === 1 || CONTEXT_BLOCK_OUT === nodeContext) {
     if (CONTEXT_FLOW_IN === nodeContext || CONTEXT_FLOW_OUT === nodeContext) {
       flowIndent = parentIndent;
     } else {
       flowIndent = parentIndent + 1;
     }
 
     blockIndent = state.position - state.lineStart;
 
     if (indentStatus === 1) {
       if (allowBlockCollections &&
           (readBlockSequence(state, blockIndent) ||
            readBlockMapping(state, blockIndent, flowIndent)) ||
           readFlowCollection(state, flowIndent)) {
         hasContent = true;
       } else {
         if ((allowBlockScalars && readBlockScalar(state, flowIndent)) ||
             readSingleQuotedScalar(state, flowIndent) ||
             readDoubleQuotedScalar(state, flowIndent)) {
           hasContent = true;
 
         } else if (readAlias(state)) {
           hasContent = true;
 
           if (state.tag !== null || state.anchor !== null) {
             throwError(state, 'alias node should not have any properties');
           }
 
         } else if (readPlainScalar(state, flowIndent, CONTEXT_FLOW_IN === nodeContext)) {
           hasContent = true;
 
           if (state.tag === null) {
             state.tag = '?';
           }
         }
 
         if (state.anchor !== null) {
           state.anchorMap[state.anchor] = state.result;
         }
       }
     } else if (indentStatus === 0) {
       // Special case: block sequences are allowed to have same indentation level as the parent.
       // http://www.yaml.org/spec/1.2/spec.html#id2799784
       hasContent = allowBlockCollections && readBlockSequence(state, blockIndent);
     }
   }
 
   if (state.tag !== null && state.tag !== '!') {
     if (state.tag === '?') {
       // Implicit resolving is not allowed for non-scalar types, and '?'
       // non-specific tag is only automatically assigned to plain scalars.
       //
       // We only need to check kind conformity in case user explicitly assigns '?'
       // tag, for example like this: "!<?> [0]"
       //
       if (state.result !== null && state.kind !== 'scalar') {
         throwError(state, 'unacceptable node kind for !<?> tag; it should be "scalar", not "' + state.kind + '"');
       }
 
       for (typeIndex = 0, typeQuantity = state.implicitTypes.length; typeIndex < typeQuantity; typeIndex += 1) {
         type = state.implicitTypes[typeIndex];
 
         if (type.resolve(state.result)) { // `state.result` updated in resolver if matched
           state.result = type.construct(state.result);
           state.tag = type.tag;
           if (state.anchor !== null) {
             state.anchorMap[state.anchor] = state.result;
           }
           break;
         }
       }
     } else if (_hasOwnProperty.call(state.typeMap[state.kind || 'fallback'], state.tag)) {
       type = state.typeMap[state.kind || 'fallback'][state.tag];
 
       if (state.result !== null && type.kind !== state.kind) {
         throwError(state, 'unacceptable node kind for !<' + state.tag + '> tag; it should be "' + type.kind + '", not "' + state.kind + '"');
       }
 
       if (!type.resolve(state.result)) { // `state.result` updated in resolver if matched
         throwError(state, 'cannot resolve a node with !<' + state.tag + '> explicit tag');
       } else {
         state.result = type.construct(state.result);
         if (state.anchor !== null) {
           state.anchorMap[state.anchor] = state.result;
         }
       }
     } else {
       throwError(state, 'unknown tag !<' + state.tag + '>');
     }
   }
 
   if (state.listener !== null) {
     state.listener('close', state);
   }
   return state.tag !== null ||  state.anchor !== null || hasContent;
 }
 
 function readDocument(state) {
   var documentStart = state.position,
       _position,
       directiveName,
       directiveArgs,
       hasDirectives = false,
       ch;
 
   state.version = null;
   state.checkLineBreaks = state.legacy;
   state.tagMap = {};
   state.anchorMap = {};
 
   while ((ch = state.input.charCodeAt(state.position)) !== 0) {
     skipSeparationSpace(state, true, -1);
 
     ch = state.input.charCodeAt(state.position);
 
     if (state.lineIndent > 0 || ch !== 0x25/* % */) {
       break;
     }
 
     hasDirectives = true;
     ch = state.input.charCodeAt(++state.position);
     _position = state.position;
 
     while (ch !== 0 && !is_WS_OR_EOL(ch)) {
       ch = state.input.charCodeAt(++state.position);
     }
 
     directiveName = state.input.slice(_position, state.position);
     directiveArgs = [];
 
     if (directiveName.length < 1) {
       throwError(state, 'directive name must not be less than one character in length');
     }
 
     while (ch !== 0) {
       while (is_WHITE_SPACE(ch)) {
         ch = state.input.charCodeAt(++state.position);
       }
 
       if (ch === 0x23/* # */) {
         do { ch = state.input.charCodeAt(++state.position); }
         while (ch !== 0 && !is_EOL(ch));
         break;
       }
 
       if (is_EOL(ch)) break;
 
       _position = state.position;
 
       while (ch !== 0 && !is_WS_OR_EOL(ch)) {
         ch = state.input.charCodeAt(++state.position);
       }
 
       directiveArgs.push(state.input.slice(_position, state.position));
     }
 
     if (ch !== 0) readLineBreak(state);
 
     if (_hasOwnProperty.call(directiveHandlers, directiveName)) {
       directiveHandlers[directiveName](state, directiveName, directiveArgs);
     } else {
       throwWarning(state, 'unknown document directive "' + directiveName + '"');
     }
   }
 
   skipSeparationSpace(state, true, -1);
 
   if (state.lineIndent === 0 &&
       state.input.charCodeAt(state.position)     === 0x2D/* - */ &&
       state.input.charCodeAt(state.position + 1) === 0x2D/* - */ &&
       state.input.charCodeAt(state.position + 2) === 0x2D/* - */) {
     state.position += 3;
     skipSeparationSpace(state, true, -1);
 
   } else if (hasDirectives) {
     throwError(state, 'directives end mark is expected');
   }
 
   composeNode(state, state.lineIndent - 1, CONTEXT_BLOCK_OUT, false, true);
   skipSeparationSpace(state, true, -1);
 
   if (state.checkLineBreaks &&
       PATTERN_NON_ASCII_LINE_BREAKS.test(state.input.slice(documentStart, state.position))) {
     throwWarning(state, 'non-ASCII line breaks are interpreted as content');
   }
 
   state.documents.push(state.result);
 
   if (state.position === state.lineStart && testDocumentSeparator(state)) {
 
     if (state.input.charCodeAt(state.position) === 0x2E/* . */) {
       state.position += 3;
       skipSeparationSpace(state, true, -1);
     }
     return;
   }
 
   if (state.position < (state.length - 1)) {
     throwError(state, 'end of the stream or a document separator is expected');
   } else {
     return;
   }
 }
 
 
 function loadDocuments(input, options) {
   input = String(input);
   options = options || {};
 
   if (input.length !== 0) {
 
     // Add tailing `\n` if not exists
     if (input.charCodeAt(input.length - 1) !== 0x0A/* LF */ &&
         input.charCodeAt(input.length - 1) !== 0x0D/* CR */) {
       input += '\n';
     }
 
     // Strip BOM
     if (input.charCodeAt(0) === 0xFEFF) {
       input = input.slice(1);
     }
   }
 
   var state = new State(input, options);
 
   var nullpos = input.indexOf('\0');
 
   if (nullpos !== -1) {
     state.position = nullpos;
     throwError(state, 'null byte is not allowed in input');
   }
 
   // Use 0 as string terminator. That significantly simplifies bounds check.
   state.input += '\0';
 
   while (state.input.charCodeAt(state.position) === 0x20/* Space */) {
     state.lineIndent += 1;
     state.position += 1;
   }
 
   while (state.position < (state.length - 1)) {
     readDocument(state);
   }
 
   return state.documents;
 }
 
 
 function loadAll(input, iterator, options) {
   if (iterator !== null && typeof iterator === 'object' && typeof options === 'undefined') {
     options = iterator;
     iterator = null;
   }
 
   var documents = loadDocuments(input, options);
 
   if (typeof iterator !== 'function') {
     return documents;
   }
 
   for (var index = 0, length = documents.length; index < length; index += 1) {
     iterator(documents[index]);
   }
 }
 
 
 function load(input, options) {
   var documents = loadDocuments(input, options);
 
   if (documents.length === 0) {
     /*eslint-disable no-undefined*/
     return undefined;
   } else if (documents.length === 1) {
     return documents[0];
   }
   throw new YAMLException('expected a single document in the stream, but found more');
 }
 
 
 function safeLoadAll(input, iterator, options) {
   if (typeof iterator === 'object' && iterator !== null && typeof options === 'undefined') {
     options = iterator;
     iterator = null;
   }
 
   return loadAll(input, iterator, common.extend({ schema: DEFAULT_SAFE_SCHEMA }, options));
 }
 
 
 function safeLoad(input, options) {
   return load(input, common.extend({ schema: DEFAULT_SAFE_SCHEMA }, options));
 }
 
 
 module.exports.loadAll     = loadAll;
 module.exports.load        = load;
 module.exports.safeLoadAll = safeLoadAll;
 module.exports.safeLoad    = safeLoad;
 
 },{"./common":2,"./exception":4,"./mark":6,"./schema/default_full":9,"./schema/default_safe":10}],6:[function(require,module,exports){
 'use strict';
 
 
 var common = require('./common');
 
 
 function Mark(name, buffer, position, line, column) {
   this.name     = name;
   this.buffer   = buffer;
   this.position = position;
   this.line     = line;
   this.column   = column;
 }
 
 
 Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
   var head, start, tail, end, snippet;
 
   if (!this.buffer) return null;
 
   indent = indent || 4;
   maxLength = maxLength || 75;
 
   head = '';
   start = this.position;
 
   while (start > 0 && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(start - 1)) === -1) {
     start -= 1;
     if (this.position - start > (maxLength / 2 - 1)) {
       head = ' ... ';
       start += 5;
       break;
     }
   }
 
   tail = '';
   end = this.position;
 
   while (end < this.buffer.length && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(end)) === -1) {
     end += 1;
     if (end - this.position > (maxLength / 2 - 1)) {
       tail = ' ... ';
       end -= 5;
       break;
     }
   }
 
   snippet = this.buffer.slice(start, end);
 
   return common.repeat(' ', indent) + head + snippet + tail + '\n' +
          common.repeat(' ', indent + this.position - start + head.length) + '^';
 };
 
 
 Mark.prototype.toString = function toString(compact) {
   var snippet, where = '';
 
   if (this.name) {
     where += 'in "' + this.name + '" ';
   }
 
   where += 'at line ' + (this.line + 1) + ', column ' + (this.column + 1);
 
   if (!compact) {
     snippet = this.getSnippet();
 
     if (snippet) {
       where += ':\n' + snippet;
     }
   }
 
   return where;
 };
 
 
 module.exports = Mark;
 
 },{"./common":2}],7:[function(require,module,exports){
 'use strict';
 
 /*eslint-disable max-len*/
 
 var common        = require('./common');
 var YAMLException = require('./exception');
 var Type          = require('./type');
 
 
 function compileList(schema, name, result) {
   var exclude = [];
 
   schema.include.forEach(function (includedSchema) {
     result = compileList(includedSchema, name, result);
   });
 
   schema[name].forEach(function (currentType) {
     result.forEach(function (previousType, previousIndex) {
       if (previousType.tag === currentType.tag && previousType.kind === currentType.kind) {
         exclude.push(previousIndex);
       }
     });
 
     result.push(currentType);
   });
 
   return result.filter(function (type, index) {
     return exclude.indexOf(index) === -1;
   });
 }
 
 
 function compileMap(/* lists... */) {
   var result = {
         scalar: {},
         sequence: {},
         mapping: {},
         fallback: {}
       }, index, length;
 
   function collectType(type) {
     result[type.kind][type.tag] = result['fallback'][type.tag] = type;
   }
 
   for (index = 0, length = arguments.length; index < length; index += 1) {
     arguments[index].forEach(collectType);
   }
   return result;
 }
 
 
 function Schema(definition) {
   this.include  = definition.include  || [];
   this.implicit = definition.implicit || [];
   this.explicit = definition.explicit || [];
 
   this.implicit.forEach(function (type) {
     if (type.loadKind && type.loadKind !== 'scalar') {
       throw new YAMLException('There is a non-scalar type in the implicit list of a schema. Implicit resolving of such types is not supported.');
     }
   });
 
   this.compiledImplicit = compileList(this, 'implicit', []);
   this.compiledExplicit = compileList(this, 'explicit', []);
   this.compiledTypeMap  = compileMap(this.compiledImplicit, this.compiledExplicit);
 }
 
 
 Schema.DEFAULT = null;
 
 
 Schema.create = function createSchema() {
   var schemas, types;
 
   switch (arguments.length) {
     case 1:
       schemas = Schema.DEFAULT;
       types = arguments[0];
       break;
 
     case 2:
       schemas = arguments[0];
       types = arguments[1];
       break;
 
     default:
       throw new YAMLException('Wrong number of arguments for Schema.create function');
   }
 
   schemas = common.toArray(schemas);
   types = common.toArray(types);
 
   if (!schemas.every(function (schema) { return schema instanceof Schema; })) {
     throw new YAMLException('Specified list of super schemas (or a single Schema object) contains a non-Schema object.');
   }
 
   if (!types.every(function (type) { return type instanceof Type; })) {
     throw new YAMLException('Specified list of YAML types (or a single Type object) contains a non-Type object.');
   }
 
   return new Schema({
     include: schemas,
     explicit: types
   });
 };
 
 
 module.exports = Schema;
 
 },{"./common":2,"./exception":4,"./type":13}],8:[function(require,module,exports){
 // Standard YAML's Core schema.
 // http://www.yaml.org/spec/1.2/spec.html#id2804923
 //
 // NOTE: JS-YAML does not support schema-specific tag resolution restrictions.
 // So, Core schema has no distinctions from JSON schema is JS-YAML.
 
 
 'use strict';
 
 
 var Schema = require('../schema');
 
 
 module.exports = new Schema({
   include: [
     require('./json')
   ]
 });
 
 },{"../schema":7,"./json":12}],9:[function(require,module,exports){
 // JS-YAML's default schema for `load` function.
 // It is not described in the YAML specification.
 //
 // This schema is based on JS-YAML's default safe schema and includes
 // JavaScript-specific types: !!js/undefined, !!js/regexp and !!js/function.
 //
 // Also this schema is used as default base schema at `Schema.create` function.
 
 
 'use strict';
 
 
 var Schema = require('../schema');
 
 
 module.exports = Schema.DEFAULT = new Schema({
   include: [
     require('./default_safe')
   ],
   explicit: [
     require('../type/js/undefined'),
     require('../type/js/regexp'),
     require('../type/js/function')
   ]
 });
 
 },{"../schema":7,"../type/js/function":18,"../type/js/regexp":19,"../type/js/undefined":20,"./default_safe":10}],10:[function(require,module,exports){
 // JS-YAML's default schema for `safeLoad` function.
 // It is not described in the YAML specification.
 //
 // This schema is based on standard YAML's Core schema and includes most of
 // extra types described at YAML tag repository. (http://yaml.org/type/)
 
 
 'use strict';
 
 
 var Schema = require('../schema');
 
 
 module.exports = new Schema({
   include: [
     require('./core')
   ],
   implicit: [
     require('../type/timestamp'),
     require('../type/merge')
   ],
   explicit: [
     require('../type/binary'),
     require('../type/omap'),
     require('../type/pairs'),
     require('../type/set')
   ]
 });
 
 },{"../schema":7,"../type/binary":14,"../type/merge":22,"../type/omap":24,"../type/pairs":25,"../type/set":27,"../type/timestamp":29,"./core":8}],11:[function(require,module,exports){
 // Standard YAML's Failsafe schema.
 // http://www.yaml.org/spec/1.2/spec.html#id2802346
 
 
 'use strict';
 
 
 var Schema = require('../schema');
 
 
 module.exports = new Schema({
   explicit: [
     require('../type/str'),
     require('../type/seq'),
     require('../type/map')
   ]
 });
 
 },{"../schema":7,"../type/map":21,"../type/seq":26,"../type/str":28}],12:[function(require,module,exports){
 // Standard YAML's JSON schema.
 // http://www.yaml.org/spec/1.2/spec.html#id2803231
 //
 // NOTE: JS-YAML does not support schema-specific tag resolution restrictions.
 // So, this schema is not such strict as defined in the YAML specification.
 // It allows numbers in binary notaion, use `Null` and `NULL` as `null`, etc.
 
 
 'use strict';
 
 
 var Schema = require('../schema');
 
 
 module.exports = new Schema({
   include: [
     require('./failsafe')
   ],
   implicit: [
     require('../type/null'),
     require('../type/bool'),
     require('../type/int'),
     require('../type/float')
   ]
 });
 
 },{"../schema":7,"../type/bool":15,"../type/float":16,"../type/int":17,"../type/null":23,"./failsafe":11}],13:[function(require,module,exports){
 'use strict';
 
 var YAMLException = require('./exception');
 
 var TYPE_CONSTRUCTOR_OPTIONS = [
   'kind',
   'resolve',
   'construct',
   'instanceOf',
   'predicate',
   'represent',
   'defaultStyle',
   'styleAliases'
 ];
 
 var YAML_NODE_KINDS = [
   'scalar',
   'sequence',
   'mapping'
 ];
 
 function compileStyleAliases(map) {
   var result = {};
 
   if (map !== null) {
     Object.keys(map).forEach(function (style) {
       map[style].forEach(function (alias) {
         result[String(alias)] = style;
       });
     });
   }
 
   return result;
 }
 
 function Type(tag, options) {
   options = options || {};
 
   Object.keys(options).forEach(function (name) {
     if (TYPE_CONSTRUCTOR_OPTIONS.indexOf(name) === -1) {
       throw new YAMLException('Unknown option "' + name + '" is met in definition of "' + tag + '" YAML type.');
     }
   });
 
   // TODO: Add tag format check.
   this.tag          = tag;
   this.kind         = options['kind']         || null;
   this.resolve      = options['resolve']      || function () { return true; };
   this.construct    = options['construct']    || function (data) { return data; };
   this.instanceOf   = options['instanceOf']   || null;
   this.predicate    = options['predicate']    || null;
   this.represent    = options['represent']    || null;
   this.defaultStyle = options['defaultStyle'] || null;
   this.styleAliases = compileStyleAliases(options['styleAliases'] || null);
 
   if (YAML_NODE_KINDS.indexOf(this.kind) === -1) {
     throw new YAMLException('Unknown kind "' + this.kind + '" is specified for "' + tag + '" YAML type.');
   }
 }
 
 module.exports = Type;
 
 },{"./exception":4}],14:[function(require,module,exports){
 'use strict';
 
 /*eslint-disable no-bitwise*/
 
 var NodeBuffer;
 
 try {
   // A trick for browserified version, to not include `Buffer` shim
   var _require = require;
   NodeBuffer = _require('buffer').Buffer;
 } catch (__) {}
 
 var Type       = require('../type');
 
 
 // [ 64, 65, 66 ] -> [ padding, CR, LF ]
 var BASE64_MAP = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=\n\r';
 
 
 function resolveYamlBinary(data) {
   if (data === null) return false;
 
   var code, idx, bitlen = 0, max = data.length, map = BASE64_MAP;
 
   // Convert one by one.
   for (idx = 0; idx < max; idx++) {
     code = map.indexOf(data.charAt(idx));
 
     // Skip CR/LF
     if (code > 64) continue;
 
     // Fail on illegal characters
     if (code < 0) return false;
 
     bitlen += 6;
   }
 
   // If there are any bits left, source was corrupted
   return (bitlen % 8) === 0;
 }
 
 function constructYamlBinary(data) {
   var idx, tailbits,
       input = data.replace(/[\r\n=]/g, ''), // remove CR/LF & padding to simplify scan
       max = input.length,
       map = BASE64_MAP,
       bits = 0,
       result = [];
 
   // Collect by 6*4 bits (3 bytes)
 
   for (idx = 0; idx < max; idx++) {
     if ((idx % 4 === 0) && idx) {
       result.push((bits >> 16) & 0xFF);
       result.push((bits >> 8) & 0xFF);
       result.push(bits & 0xFF);
     }
 
     bits = (bits << 6) | map.indexOf(input.charAt(idx));
   }
 
   // Dump tail
 
   tailbits = (max % 4) * 6;
 
   if (tailbits === 0) {
     result.push((bits >> 16) & 0xFF);
     result.push((bits >> 8) & 0xFF);
     result.push(bits & 0xFF);
   } else if (tailbits === 18) {
     result.push((bits >> 10) & 0xFF);
     result.push((bits >> 2) & 0xFF);
   } else if (tailbits === 12) {
     result.push((bits >> 4) & 0xFF);
   }
 
   // Wrap into Buffer for NodeJS and leave Array for browser
   if (NodeBuffer) {
     // Support node 6.+ Buffer API when available
     return NodeBuffer.from ? NodeBuffer.from(result) : new NodeBuffer(result);
   }
 
   return result;
 }
 
 function representYamlBinary(object /*, style*/) {
   var result = '', bits = 0, idx, tail,
       max = object.length,
       map = BASE64_MAP;
 
   // Convert every three bytes to 4 ASCII characters.
 
   for (idx = 0; idx < max; idx++) {
     if ((idx % 3 === 0) && idx) {
       result += map[(bits >> 18) & 0x3F];
       result += map[(bits >> 12) & 0x3F];
       result += map[(bits >> 6) & 0x3F];
       result += map[bits & 0x3F];
     }
 
     bits = (bits << 8) + object[idx];
   }
 
   // Dump tail
 
   tail = max % 3;
 
   if (tail === 0) {
     result += map[(bits >> 18) & 0x3F];
     result += map[(bits >> 12) & 0x3F];
     result += map[(bits >> 6) & 0x3F];
     result += map[bits & 0x3F];
   } else if (tail === 2) {
     result += map[(bits >> 10) & 0x3F];
     result += map[(bits >> 4) & 0x3F];
     result += map[(bits << 2) & 0x3F];
     result += map[64];
   } else if (tail === 1) {
     result += map[(bits >> 2) & 0x3F];
     result += map[(bits << 4) & 0x3F];
     result += map[64];
     result += map[64];
   }
 
   return result;
 }
 
 function isBinary(object) {
   return NodeBuffer && NodeBuffer.isBuffer(object);
 }
 
 module.exports = new Type('tag:yaml.org,2002:binary', {
   kind: 'scalar',
   resolve: resolveYamlBinary,
   construct: constructYamlBinary,
   predicate: isBinary,
   represent: representYamlBinary
 });
 
 },{"../type":13}],15:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 function resolveYamlBoolean(data) {
   if (data === null) return false;
 
   var max = data.length;
 
   return (max === 4 && (data === 'true' || data === 'True' || data === 'TRUE')) ||
          (max === 5 && (data === 'false' || data === 'False' || data === 'FALSE'));
 }
 
 function constructYamlBoolean(data) {
   return data === 'true' ||
          data === 'True' ||
          data === 'TRUE';
 }
 
 function isBoolean(object) {
   return Object.prototype.toString.call(object) === '[object Boolean]';
 }
 
 module.exports = new Type('tag:yaml.org,2002:bool', {
   kind: 'scalar',
   resolve: resolveYamlBoolean,
   construct: constructYamlBoolean,
   predicate: isBoolean,
   represent: {
     lowercase: function (object) { return object ? 'true' : 'false'; },
     uppercase: function (object) { return object ? 'TRUE' : 'FALSE'; },
     camelcase: function (object) { return object ? 'True' : 'False'; }
   },
   defaultStyle: 'lowercase'
 });
 
 },{"../type":13}],16:[function(require,module,exports){
 'use strict';
 
 var common = require('../common');
 var Type   = require('../type');
 
 var YAML_FLOAT_PATTERN = new RegExp(
   // 2.5e4, 2.5 and integers
   '^(?:[-+]?(?:0|[1-9][0-9_]*)(?:\\.[0-9_]*)?(?:[eE][-+]?[0-9]+)?' +
   // .2e4, .2
   // special case, seems not from spec
   '|\\.[0-9_]+(?:[eE][-+]?[0-9]+)?' +
   // 20:59
   '|[-+]?[0-9][0-9_]*(?::[0-5]?[0-9])+\\.[0-9_]*' +
   // .inf
   '|[-+]?\\.(?:inf|Inf|INF)' +
   // .nan
   '|\\.(?:nan|NaN|NAN))$');
 
 function resolveYamlFloat(data) {
   if (data === null) return false;
 
   if (!YAML_FLOAT_PATTERN.test(data) ||
       // Quick hack to not allow integers end with `_`
       // Probably should update regexp & check speed
       data[data.length - 1] === '_') {
     return false;
   }
 
   return true;
 }
 
 function constructYamlFloat(data) {
   var value, sign, base, digits;
 
   value  = data.replace(/_/g, '').toLowerCase();
   sign   = value[0] === '-' ? -1 : 1;
   digits = [];
 
   if ('+-'.indexOf(value[0]) >= 0) {
     value = value.slice(1);
   }
 
   if (value === '.inf') {
     return (sign === 1) ? Number.POSITIVE_INFINITY : Number.NEGATIVE_INFINITY;
 
   } else if (value === '.nan') {
     return NaN;
 
   } else if (value.indexOf(':') >= 0) {
     value.split(':').forEach(function (v) {
       digits.unshift(parseFloat(v, 10));
     });
 
     value = 0.0;
     base = 1;
 
     digits.forEach(function (d) {
       value += d * base;
       base *= 60;
     });
 
     return sign * value;
 
   }
   return sign * parseFloat(value, 10);
 }
 
 
 var SCIENTIFIC_WITHOUT_DOT = /^[-+]?[0-9]+e/;
 
 function representYamlFloat(object, style) {
   var res;
 
   if (isNaN(object)) {
     switch (style) {
       case 'lowercase': return '.nan';
       case 'uppercase': return '.NAN';
       case 'camelcase': return '.NaN';
     }
   } else if (Number.POSITIVE_INFINITY === object) {
     switch (style) {
       case 'lowercase': return '.inf';
       case 'uppercase': return '.INF';
       case 'camelcase': return '.Inf';
     }
   } else if (Number.NEGATIVE_INFINITY === object) {
     switch (style) {
       case 'lowercase': return '-.inf';
       case 'uppercase': return '-.INF';
       case 'camelcase': return '-.Inf';
     }
   } else if (common.isNegativeZero(object)) {
     return '-0.0';
   }
 
   res = object.toString(10);
 
   // JS stringifier can build scientific format without dots: 5e-100,
   // while YAML requres dot: 5.e-100. Fix it with simple hack
 
   return SCIENTIFIC_WITHOUT_DOT.test(res) ? res.replace('e', '.e') : res;
 }
 
 function isFloat(object) {
   return (Object.prototype.toString.call(object) === '[object Number]') &&
          (object % 1 !== 0 || common.isNegativeZero(object));
 }
 
 module.exports = new Type('tag:yaml.org,2002:float', {
   kind: 'scalar',
   resolve: resolveYamlFloat,
   construct: constructYamlFloat,
   predicate: isFloat,
   represent: representYamlFloat,
   defaultStyle: 'lowercase'
 });
 
 },{"../common":2,"../type":13}],17:[function(require,module,exports){
 'use strict';
 
 var common = require('../common');
 var Type   = require('../type');
 
 function isHexCode(c) {
   return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */)) ||
          ((0x41/* A */ <= c) && (c <= 0x46/* F */)) ||
          ((0x61/* a */ <= c) && (c <= 0x66/* f */));
 }
 
 function isOctCode(c) {
   return ((0x30/* 0 */ <= c) && (c <= 0x37/* 7 */));
 }
 
 function isDecCode(c) {
   return ((0x30/* 0 */ <= c) && (c <= 0x39/* 9 */));
 }
 
 function resolveYamlInteger(data) {
   if (data === null) return false;
 
   var max = data.length,
       index = 0,
       hasDigits = false,
       ch;
 
   if (!max) return false;
 
   ch = data[index];
 
   // sign
   if (ch === '-' || ch === '+') {
     ch = data[++index];
   }
 
   if (ch === '0') {
     // 0
     if (index + 1 === max) return true;
     ch = data[++index];
 
     // base 2, base 8, base 16
 
     if (ch === 'b') {
       // base 2
       index++;
 
       for (; index < max; index++) {
         ch = data[index];
         if (ch === '_') continue;
         if (ch !== '0' && ch !== '1') return false;
         hasDigits = true;
       }
       return hasDigits && ch !== '_';
     }
 
 
     if (ch === 'x') {
       // base 16
       index++;
 
       for (; index < max; index++) {
         ch = data[index];
         if (ch === '_') continue;
         if (!isHexCode(data.charCodeAt(index))) return false;
         hasDigits = true;
       }
       return hasDigits && ch !== '_';
     }
 
     // base 8
     for (; index < max; index++) {
       ch = data[index];
       if (ch === '_') continue;
       if (!isOctCode(data.charCodeAt(index))) return false;
       hasDigits = true;
     }
     return hasDigits && ch !== '_';
   }
 
   // base 10 (except 0) or base 60
 
   // value should not start with `_`;
   if (ch === '_') return false;
 
   for (; index < max; index++) {
     ch = data[index];
     if (ch === '_') continue;
     if (ch === ':') break;
     if (!isDecCode(data.charCodeAt(index))) {
       return false;
     }
     hasDigits = true;
   }
 
   // Should have digits and should not end with `_`
   if (!hasDigits || ch === '_') return false;
 
   // if !base60 - done;
   if (ch !== ':') return true;
 
   // base60 almost not used, no needs to optimize
   return /^(:[0-5]?[0-9])+$/.test(data.slice(index));
 }
 
 function constructYamlInteger(data) {
   var value = data, sign = 1, ch, base, digits = [];
 
   if (value.indexOf('_') !== -1) {
     value = value.replace(/_/g, '');
   }
 
   ch = value[0];
 
   if (ch === '-' || ch === '+') {
     if (ch === '-') sign = -1;
     value = value.slice(1);
     ch = value[0];
   }
 
   if (value === '0') return 0;
 
   if (ch === '0') {
     if (value[1] === 'b') return sign * parseInt(value.slice(2), 2);
     if (value[1] === 'x') return sign * parseInt(value, 16);
     return sign * parseInt(value, 8);
   }
 
   if (value.indexOf(':') !== -1) {
     value.split(':').forEach(function (v) {
       digits.unshift(parseInt(v, 10));
     });
 
     value = 0;
     base = 1;
 
     digits.forEach(function (d) {
       value += (d * base);
       base *= 60;
     });
 
     return sign * value;
 
   }
 
   return sign * parseInt(value, 10);
 }
 
 function isInteger(object) {
   return (Object.prototype.toString.call(object)) === '[object Number]' &&
          (object % 1 === 0 && !common.isNegativeZero(object));
 }
 
 module.exports = new Type('tag:yaml.org,2002:int', {
   kind: 'scalar',
   resolve: resolveYamlInteger,
   construct: constructYamlInteger,
   predicate: isInteger,
   represent: {
     binary:      function (obj) { return obj >= 0 ? '0b' + obj.toString(2) : '-0b' + obj.toString(2).slice(1); },
     octal:       function (obj) { return obj >= 0 ? '0'  + obj.toString(8) : '-0'  + obj.toString(8).slice(1); },
     decimal:     function (obj) { return obj.toString(10); },
     /* eslint-disable max-len */
     hexadecimal: function (obj) { return obj >= 0 ? '0x' + obj.toString(16).toUpperCase() :  '-0x' + obj.toString(16).toUpperCase().slice(1); }
   },
   defaultStyle: 'decimal',
   styleAliases: {
     binary:      [ 2,  'bin' ],
     octal:       [ 8,  'oct' ],
     decimal:     [ 10, 'dec' ],
     hexadecimal: [ 16, 'hex' ]
   }
 });
 
 },{"../common":2,"../type":13}],18:[function(require,module,exports){
 'use strict';
 
 var esprima;
 
 // Browserified version does not have esprima
 //
 // 1. For node.js just require module as deps
 // 2. For browser try to require mudule via external AMD system.
 //    If not found - try to fallback to window.esprima. If not
 //    found too - then fail to parse.
 //
 try {
   // workaround to exclude package from browserify list.
   var _require = require;
   esprima = _require('esprima');
 } catch (_) {
   /* eslint-disable no-redeclare */
   /* global window */
   if (typeof window !== 'undefined') esprima = window.esprima;
 }
 
 var Type = require('../../type');
 
 function resolveJavascriptFunction(data) {
   if (data === null) return false;
 
   try {
     var source = '(' + data + ')',
         ast    = esprima.parse(source, { range: true });
 
     if (ast.type                    !== 'Program'             ||
         ast.body.length             !== 1                     ||
         ast.body[0].type            !== 'ExpressionStatement' ||
         (ast.body[0].expression.type !== 'ArrowFunctionExpression' &&
           ast.body[0].expression.type !== 'FunctionExpression')) {
       return false;
     }
 
     return true;
   } catch (err) {
     return false;
   }
 }
 
 function constructJavascriptFunction(data) {
   /*jslint evil:true*/
 
   var source = '(' + data + ')',
       ast    = esprima.parse(source, { range: true }),
       params = [],
       body;
 
   if (ast.type                    !== 'Program'             ||
       ast.body.length             !== 1                     ||
       ast.body[0].type            !== 'ExpressionStatement' ||
       (ast.body[0].expression.type !== 'ArrowFunctionExpression' &&
         ast.body[0].expression.type !== 'FunctionExpression')) {
     throw new Error('Failed to resolve function');
   }
 
   ast.body[0].expression.params.forEach(function (param) {
     params.push(param.name);
   });
 
   body = ast.body[0].expression.body.range;
 
   // Esprima's ranges include the first '{' and the last '}' characters on
   // function expressions. So cut them out.
   if (ast.body[0].expression.body.type === 'BlockStatement') {
     /*eslint-disable no-new-func*/
     return new Function(params, source.slice(body[0] + 1, body[1] - 1));
   }
   // ES6 arrow functions can omit the BlockStatement. In that case, just return
   // the body.
   /*eslint-disable no-new-func*/
   return new Function(params, 'return ' + source.slice(body[0], body[1]));
 }
 
 function representJavascriptFunction(object /*, style*/) {
   return object.toString();
 }
 
 function isFunction(object) {
   return Object.prototype.toString.call(object) === '[object Function]';
 }
 
 module.exports = new Type('tag:yaml.org,2002:js/function', {
   kind: 'scalar',
   resolve: resolveJavascriptFunction,
   construct: constructJavascriptFunction,
   predicate: isFunction,
   represent: representJavascriptFunction
 });
 
 },{"../../type":13}],19:[function(require,module,exports){
 'use strict';
 
 var Type = require('../../type');
 
 function resolveJavascriptRegExp(data) {
   if (data === null) return false;
   if (data.length === 0) return false;
 
   var regexp = data,
       tail   = /\/([gim]*)$/.exec(data),
       modifiers = '';
 
   // if regexp starts with '/' it can have modifiers and must be properly closed
   // `/foo/gim` - modifiers tail can be maximum 3 chars
   if (regexp[0] === '/') {
     if (tail) modifiers = tail[1];
 
     if (modifiers.length > 3) return false;
     // if expression starts with /, is should be properly terminated
     if (regexp[regexp.length - modifiers.length - 1] !== '/') return false;
   }
 
   return true;
 }
 
 function constructJavascriptRegExp(data) {
   var regexp = data,
       tail   = /\/([gim]*)$/.exec(data),
       modifiers = '';
 
   // `/foo/gim` - tail can be maximum 4 chars
   if (regexp[0] === '/') {
     if (tail) modifiers = tail[1];
     regexp = regexp.slice(1, regexp.length - modifiers.length - 1);
   }
 
   return new RegExp(regexp, modifiers);
 }
 
 function representJavascriptRegExp(object /*, style*/) {
   var result = '/' + object.source + '/';
 
   if (object.global) result += 'g';
   if (object.multiline) result += 'm';
   if (object.ignoreCase) result += 'i';
 
   return result;
 }
 
 function isRegExp(object) {
   return Object.prototype.toString.call(object) === '[object RegExp]';
 }
 
 module.exports = new Type('tag:yaml.org,2002:js/regexp', {
   kind: 'scalar',
   resolve: resolveJavascriptRegExp,
   construct: constructJavascriptRegExp,
   predicate: isRegExp,
   represent: representJavascriptRegExp
 });
 
 },{"../../type":13}],20:[function(require,module,exports){
 'use strict';
 
 var Type = require('../../type');
 
 function resolveJavascriptUndefined() {
   return true;
 }
 
 function constructJavascriptUndefined() {
   /*eslint-disable no-undefined*/
   return undefined;
 }
 
 function representJavascriptUndefined() {
   return '';
 }
 
 function isUndefined(object) {
   return typeof object === 'undefined';
 }
 
 module.exports = new Type('tag:yaml.org,2002:js/undefined', {
   kind: 'scalar',
   resolve: resolveJavascriptUndefined,
   construct: constructJavascriptUndefined,
   predicate: isUndefined,
   represent: representJavascriptUndefined
 });
 
 },{"../../type":13}],21:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 module.exports = new Type('tag:yaml.org,2002:map', {
   kind: 'mapping',
   construct: function (data) { return data !== null ? data : {}; }
 });
 
 },{"../type":13}],22:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 function resolveYamlMerge(data) {
   return data === '<<' || data === null;
 }
 
 module.exports = new Type('tag:yaml.org,2002:merge', {
   kind: 'scalar',
   resolve: resolveYamlMerge
 });
 
 },{"../type":13}],23:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 function resolveYamlNull(data) {
   if (data === null) return true;
 
   var max = data.length;
 
   return (max === 1 && data === '~') ||
          (max === 4 && (data === 'null' || data === 'Null' || data === 'NULL'));
 }
 
 function constructYamlNull() {
   return null;
 }
 
 function isNull(object) {
   return object === null;
 }
 
 module.exports = new Type('tag:yaml.org,2002:null', {
   kind: 'scalar',
   resolve: resolveYamlNull,
   construct: constructYamlNull,
   predicate: isNull,
   represent: {
     canonical: function () { return '~';    },
     lowercase: function () { return 'null'; },
     uppercase: function () { return 'NULL'; },
     camelcase: function () { return 'Null'; }
   },
   defaultStyle: 'lowercase'
 });
 
 },{"../type":13}],24:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 var _hasOwnProperty = Object.prototype.hasOwnProperty;
 var _toString       = Object.prototype.toString;
 
 function resolveYamlOmap(data) {
   if (data === null) return true;
 
   var objectKeys = [], index, length, pair, pairKey, pairHasKey,
       object = data;
 
   for (index = 0, length = object.length; index < length; index += 1) {
     pair = object[index];
     pairHasKey = false;
 
     if (_toString.call(pair) !== '[object Object]') return false;
 
     for (pairKey in pair) {
       if (_hasOwnProperty.call(pair, pairKey)) {
         if (!pairHasKey) pairHasKey = true;
         else return false;
       }
     }
 
     if (!pairHasKey) return false;
 
     if (objectKeys.indexOf(pairKey) === -1) objectKeys.push(pairKey);
     else return false;
   }
 
   return true;
 }
 
 function constructYamlOmap(data) {
   return data !== null ? data : [];
 }
 
 module.exports = new Type('tag:yaml.org,2002:omap', {
   kind: 'sequence',
   resolve: resolveYamlOmap,
   construct: constructYamlOmap
 });
 
 },{"../type":13}],25:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 var _toString = Object.prototype.toString;
 
 function resolveYamlPairs(data) {
   if (data === null) return true;
 
   var index, length, pair, keys, result,
       object = data;
 
   result = new Array(object.length);
 
   for (index = 0, length = object.length; index < length; index += 1) {
     pair = object[index];
 
     if (_toString.call(pair) !== '[object Object]') return false;
 
     keys = Object.keys(pair);
 
     if (keys.length !== 1) return false;
 
     result[index] = [ keys[0], pair[keys[0]] ];
   }
 
   return true;
 }
 
 function constructYamlPairs(data) {
   if (data === null) return [];
 
   var index, length, pair, keys, result,
       object = data;
 
   result = new Array(object.length);
 
   for (index = 0, length = object.length; index < length; index += 1) {
     pair = object[index];
 
     keys = Object.keys(pair);
 
     result[index] = [ keys[0], pair[keys[0]] ];
   }
 
   return result;
 }
 
 module.exports = new Type('tag:yaml.org,2002:pairs', {
   kind: 'sequence',
   resolve: resolveYamlPairs,
   construct: constructYamlPairs
 });
 
 },{"../type":13}],26:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 module.exports = new Type('tag:yaml.org,2002:seq', {
   kind: 'sequence',
   construct: function (data) { return data !== null ? data : []; }
 });
 
 },{"../type":13}],27:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 var _hasOwnProperty = Object.prototype.hasOwnProperty;
 
 function resolveYamlSet(data) {
   if (data === null) return true;
 
   var key, object = data;
 
   for (key in object) {
     if (_hasOwnProperty.call(object, key)) {
       if (object[key] !== null) return false;
     }
   }
 
   return true;
 }
 
 function constructYamlSet(data) {
   return data !== null ? data : {};
 }
 
 module.exports = new Type('tag:yaml.org,2002:set', {
   kind: 'mapping',
   resolve: resolveYamlSet,
   construct: constructYamlSet
 });
 
 },{"../type":13}],28:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 module.exports = new Type('tag:yaml.org,2002:str', {
   kind: 'scalar',
   construct: function (data) { return data !== null ? data : ''; }
 });
 
 },{"../type":13}],29:[function(require,module,exports){
 'use strict';
 
 var Type = require('../type');
 
 var YAML_DATE_REGEXP = new RegExp(
   '^([0-9][0-9][0-9][0-9])'          + // [1] year
   '-([0-9][0-9])'                    + // [2] month
   '-([0-9][0-9])$');                   // [3] day
 
 var YAML_TIMESTAMP_REGEXP = new RegExp(
   '^([0-9][0-9][0-9][0-9])'          + // [1] year
   '-([0-9][0-9]?)'                   + // [2] month
   '-([0-9][0-9]?)'                   + // [3] day
   '(?:[Tt]|[ \\t]+)'                 + // ...
   '([0-9][0-9]?)'                    + // [4] hour
   ':([0-9][0-9])'                    + // [5] minute
   ':([0-9][0-9])'                    + // [6] second
   '(?:\\.([0-9]*))?'                 + // [7] fraction
   '(?:[ \\t]*(Z|([-+])([0-9][0-9]?)' + // [8] tz [9] tz_sign [10] tz_hour
   '(?::([0-9][0-9]))?))?$');           // [11] tz_minute
 
 function resolveYamlTimestamp(data) {
   if (data === null) return false;
   if (YAML_DATE_REGEXP.exec(data) !== null) return true;
   if (YAML_TIMESTAMP_REGEXP.exec(data) !== null) return true;
   return false;
 }
 
 function constructYamlTimestamp(data) {
   var match, year, month, day, hour, minute, second, fraction = 0,
       delta = null, tz_hour, tz_minute, date;
 
   match = YAML_DATE_REGEXP.exec(data);
   if (match === null) match = YAML_TIMESTAMP_REGEXP.exec(data);
 
   if (match === null) throw new Error('Date resolve error');
 
   // match: [1] year [2] month [3] day
 
   year = +(match[1]);
   month = +(match[2]) - 1; // JS month starts with 0
   day = +(match[3]);
 
   if (!match[4]) { // no hour
     return new Date(Date.UTC(year, month, day));
   }
 
   // match: [4] hour [5] minute [6] second [7] fraction
 
   hour = +(match[4]);
   minute = +(match[5]);
   second = +(match[6]);
 
   if (match[7]) {
     fraction = match[7].slice(0, 3);
     while (fraction.length < 3) { // milli-seconds
       fraction += '0';
     }
     fraction = +fraction;
   }
 
   // match: [8] tz [9] tz_sign [10] tz_hour [11] tz_minute
 
   if (match[9]) {
     tz_hour = +(match[10]);
     tz_minute = +(match[11] || 0);
     delta = (tz_hour * 60 + tz_minute) * 60000; // delta in mili-seconds
     if (match[9] === '-') delta = -delta;
   }
 
   date = new Date(Date.UTC(year, month, day, hour, minute, second, fraction));
 
   if (delta) date.setTime(date.getTime() - delta);
 
   return date;
 }
 
 function representYamlTimestamp(object /*, style*/) {
   return object.toISOString();
 }
 
 module.exports = new Type('tag:yaml.org,2002:timestamp', {
   kind: 'scalar',
   resolve: resolveYamlTimestamp,
   construct: constructYamlTimestamp,
   instanceOf: Date,
   represent: representYamlTimestamp
 });
 
 },{"../type":13}],"/":[function(require,module,exports){
 'use strict';
 
 
 var yaml = require('./lib/js-yaml.js');
 
 
 module.exports = yaml;
 
 },{"./lib/js-yaml.js":1}]},{},[])("/")
 });