grammar.coffee

# DSL in grammar.coffee
o = (patternString, action, options) ->
  patternString = patternString.replace /\s{2,}/g, ' '
  return [patternString, '$$ = $1;', options] unless action
  action = if match = unwrap.exec action then match[1] else "(#{action}())"
  action = action.replace /\bnew /g, '$&yy.'
  action = action.replace /\b(?:Block\.wrap|extend)\b/g, 'yy.$&'
  action = action.replace /(this\.\$)/g, '@'
  console.log action
  [patternString, "$$ = #{action};", options]

grammar.js

// Compiled DSL in grammar.js
  o = function(patternString, action, options) {
    var match;
    patternString = patternString.replace(/\s{2,}/g, ' ');
    if (!action) {
      return [patternString, '$$ = $1;', options];
    }
    action = (match = unwrap.exec(action)) ? match[1] : "(" + action + "())";
    action = action.replace(/\bnew /g, '$&yy.');
    action = action.replace(/\b(?:Block\.wrap|extend)\b/g, 'yy.$&');
    action = action.replace(/(this\.\$)/g, '@');
    console.log(action);
    return [patternString, "$$ = " + action + ";", options];
  };

jison.js

// Relevant @ transformation from jison

                    action = action.replace(/([^'"])\$\$|^\$\$/g, '$1this.$').replace(/@[0$]/g, "this._$")
                        .replace(/\$(\d+)/g, function (_, n) {
                            return "$$[$0" + (n - rhs.length || '') + "]";
                        })
                        .replace(/@(\d+)/g, function (_, n) {
                            return "_$[$0" + (n - rhs.length || '') + "]";
                        });

parser.js

// Example of how the @ transformation isn't looking right in parser.js
case 31:this.$ = new yy.Literal(this._$.first_line, this._$.first_column, $$[$0]);