define(['exports', 'module'], function (exports, module) {
  'use strict';

  var AST = {
    // Public API used to evaluate derived attributes regarding AST nodes
    helpers: {
      // a mustache is definitely a helper if:
      // * it is an eligible helper, and
      // * it has at least one parameter or hash segment
      helperExpression: function helperExpression(node) {
        return node.type === 'SubExpression' || (node.type === 'MustacheStatement' || node.type === 'BlockStatement') && !!(node.params && node.params.length || node.hash);
      },

      scopedId: function scopedId(path) {
        return (/^\.|this\b/.test(path.original)
        );
      },

      // an ID is simple if it only has one part, and that part is not
      // `..` or `this`.
      simpleId: function simpleId(path) {
        return path.parts.length === 1 && !AST.helpers.scopedId(path) && !path.depth;
      }
    }
  };

  // Must be exported as an object rather than the root of the module as the jison lexer
  // must modify the object to operate properly.
  module.exports = AST;
});
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