grunt-zuckrig-closure/tasks/Writer.js

Reduce a verbose syntax for Google Closure Compiler to be more Pythonic/Rubistic.

/**
  Inspirated by https://github.com/steida/coffee2closure
 */
var Writer;

Writer = (function() {
  function Writer() {}

  Writer.prototype._create_space = function(length, new_line) {
    var space;
    if (length < 0) {
      return '';
    }
    space = new Array(length + 1).join(' ');
    if (new_line) {
      space = '\n' + space;
    }
    return space;
  };

  Writer.prototype.write = function(tokens) {
    var i, new_line, prev, source, token, _i, _len;
    source = '';
    prev = null;
    for (i = _i = 0, _len = tokens.length; _i < _len; i = ++_i) {
      token = tokens[i];
      new_line = false;
      if (prev != null) {
        new_line = token.loc.start.line !== prev.loc.end.line;
        if (new_line) {
          source += this._create_space(token.loc.start.column, true);
        } else {
          source += this._create_space(token.loc.start.column - prev.loc.end.column);
        }
      }
      if (token.type === 'NewBlock') {
        source += "  /*" + token.value + "  */";
      } else if (token.type === 'Block') {
        source += "/*" + token.value + "*/";
      } else if (token.type === 'Line') {
        source += "//" + token.value;
      } else {
        source += token.value;
        if (token.value === ';') {
          source += "\n";
        }
      }
      prev = token;
    }
    return source;
  };

  return Writer;

})();

module.exports = Writer;