l0bsterssg

node.js static responsive blog post generator
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mark.js (1562B)


      1 'use strict';
      2 
      3 
      4 var common = require('./common');
      5 
      6 
      7 function Mark(name, buffer, position, line, column) {
      8   this.name     = name;
      9   this.buffer   = buffer;
     10   this.position = position;
     11   this.line     = line;
     12   this.column   = column;
     13 }
     14 
     15 
     16 Mark.prototype.getSnippet = function getSnippet(indent, maxLength) {
     17   var head, start, tail, end, snippet;
     18 
     19   if (!this.buffer) return null;
     20 
     21   indent = indent || 4;
     22   maxLength = maxLength || 75;
     23 
     24   head = '';
     25   start = this.position;
     26 
     27   while (start > 0 && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(start - 1)) === -1) {
     28     start -= 1;
     29     if (this.position - start > (maxLength / 2 - 1)) {
     30       head = ' ... ';
     31       start += 5;
     32       break;
     33     }
     34   }
     35 
     36   tail = '';
     37   end = this.position;
     38 
     39   while (end < this.buffer.length && '\x00\r\n\x85\u2028\u2029'.indexOf(this.buffer.charAt(end)) === -1) {
     40     end += 1;
     41     if (end - this.position > (maxLength / 2 - 1)) {
     42       tail = ' ... ';
     43       end -= 5;
     44       break;
     45     }
     46   }
     47 
     48   snippet = this.buffer.slice(start, end);
     49 
     50   return common.repeat(' ', indent) + head + snippet + tail + '\n' +
     51          common.repeat(' ', indent + this.position - start + head.length) + '^';
     52 };
     53 
     54 
     55 Mark.prototype.toString = function toString(compact) {
     56   var snippet, where = '';
     57 
     58   if (this.name) {
     59     where += 'in "' + this.name + '" ';
     60   }
     61 
     62   where += 'at line ' + (this.line + 1) + ', column ' + (this.column + 1);
     63 
     64   if (!compact) {
     65     snippet = this.getSnippet();
     66 
     67     if (snippet) {
     68       where += ':\n' + snippet;
     69     }
     70   }
     71 
     72   return where;
     73 };
     74 
     75 
     76 module.exports = Mark;