ejs源码

exports.compile = function compile(template, opts) {
  var templ;
  // v1 compat
  // 'scope' is 'context'
  // FIXME: Remove this in a future version
  //模板 参数
  if (opts && opts.scope) {
    if (!scopeOptionWarned){
      console.warn('`scope` option is deprecated and will be removed in EJS 3');
      scopeOptionWarned = true;
    }
    if (!opts.context) {
      opts.context = opts.scope;
    }
    delete opts.scope;
  }
  templ = new Template(template, opts);
  return templ.compile();
};

Template.prototype = {
  createRegex: function () {
    //创建的一些正则分组
    var str = _REGEX_STRING;
    //得到分隔符
    var delim = utils.escapeRegExpChars(this.opts.delimiter);
    //分到分隔符的首字母
    var open = utils.escapeRegExpChars(this.opts.openDelimiter);
    //分到分隔符的结束字母
    var close = utils.escapeRegExpChars(this.opts.closeDelimiter);
    //根据分隔符，重新处理正则表达式
    str = str.replace(/%/g, delim)
      .replace(/</g, open)
      .replace(/>/g, close);
    return new RegExp(str);
  },

//解析模板的数据
parseTemplateText: function () {
    var str = this.templateText;
    var pat = this.regex;
    var result = pat.exec(str);
    var arr = [];
    var firstPos;
    while (result) {
      firstPos = result.index;
      if (firstPos !== 0) {
        //取标签
        arr.push(str.substring(0, firstPos));
        str = str.slice(firstPos);
      }
      arr.push(result[0]);
      str = str.slice(result[0].length);
      result = pat.exec(str);
    }
    if (str) {
      arr.push(str);
    }
    return arr;
  },

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