twitst4tz

twitter statistics web application
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compile-dots.js (2431B)

      1 //compile doT templates to js functions
      2 'use strict';
      3 
      4 var glob = require('glob')
      5   , fs = require('fs')
      6   , path = require('path')
      7   , doT = require('dot')
      8   , beautify = require('js-beautify').js_beautify;
      9 
     10 var defsRootPath = process.argv[2] || path.join(__dirname, '../lib');
     11 
     12 var defs = {};
     13 var defFiles = glob.sync('./dot/**/*.def', { cwd: defsRootPath });
     14 defFiles.forEach(function (f) {
     15   var name = path.basename(f, '.def');
     16   defs[name] = fs.readFileSync(path.join(defsRootPath, f));
     17 });
     18 
     19 var filesRootPath = process.argv[3] || path.join(__dirname, '../lib');
     20 var files = glob.sync('./dot/**/*.jst', { cwd: filesRootPath });
     21 
     22 var dotjsPath = path.join(filesRootPath, './dotjs');
     23 try { fs.mkdirSync(dotjsPath); } catch(e) {}
     24 
     25 console.log('\n\nCompiling:');
     26 
     27 var FUNCTION_NAME = /function\s+anonymous\s*\(it[^)]*\)\s*{/;
     28 var OUT_EMPTY_STRING = /out\s*\+=\s*'\s*';/g;
     29 var ISTANBUL = /'(istanbul[^']+)';/g;
     30 var ERROR_KEYWORD = /\$errorKeyword/g;
     31 var ERROR_KEYWORD_OR = /\$errorKeyword\s+\|\|/g;
     32 var VARS = [
     33   '$errs', '$valid', '$lvl', '$data', '$dataLvl',
     34   '$errorKeyword', '$closingBraces', '$schemaPath',
     35   '$validate'
     36 ];
     37 
     38 files.forEach(function (f) {
     39   var keyword = path.basename(f, '.jst');
     40   var targetPath = path.join(dotjsPath, keyword + '.js');
     41   var template = fs.readFileSync(path.join(filesRootPath, f));
     42   var code = doT.compile(template, defs);
     43   code = code.toString()
     44              .replace(OUT_EMPTY_STRING, '')
     45              .replace(FUNCTION_NAME, 'function generate_' + keyword + '(it, $keyword, $ruleType) {')
     46              .replace(ISTANBUL, '/* $1 */');
     47   removeAlwaysFalsyInOr();
     48   VARS.forEach(removeUnusedVar);
     49   code = "'use strict';\nmodule.exports = " + code;
     50   code = beautify(code, { indent_size: 2 }) + '\n';
     51   fs.writeFileSync(targetPath, code);
     52   console.log('compiled', keyword);
     53 
     54   function removeUnusedVar(v) {
     55     v = v.replace(/\$/g, '\\$$');
     56     var regexp = new RegExp(v + '[^A-Za-z0-9_$]', 'g');
     57     var count = occurrences(regexp);
     58     if (count == 1) {
     59       regexp = new RegExp('var\\s+' + v + '\\s*=[^;]+;|var\\s+' + v + ';');
     60       code = code.replace(regexp, '');
     61     }
     62   }
     63 
     64   function removeAlwaysFalsyInOr() {
     65     var countUsed = occurrences(ERROR_KEYWORD);
     66     var countOr = occurrences(ERROR_KEYWORD_OR);
     67     if (countUsed == countOr + 1) code = code.replace(ERROR_KEYWORD_OR, '');
     68   }
     69 
     70   function occurrences(regexp) {
     71     return (code.match(regexp) || []).length;
     72   }
     73 });