Function $parse

test/angular/1.6/angular.js:16756–16788

(exp, interceptorFn)

    return $parse;

    function $parse(exp, interceptorFn) {
      var parsedExpression, cacheKey;

      switch (typeof exp) {
        case 'string':
          exp = exp.trim();
          cacheKey = exp;

          parsedExpression = cache[cacheKey];

          if (!parsedExpression) {
            var lexer = new Lexer($parseOptions);
            var parser = new Parser(lexer, $filter, $parseOptions);
            parsedExpression = parser.parse(exp);
            if (parsedExpression.constant) {
              parsedExpression.$$watchDelegate = constantWatchDelegate;
            } else if (parsedExpression.oneTime) {
              parsedExpression.$$watchDelegate = parsedExpression.literal ?
                  oneTimeLiteralWatchDelegate : oneTimeWatchDelegate;
            } else if (parsedExpression.inputs) {
              parsedExpression.$$watchDelegate = inputsWatchDelegate;
            }
            cache[cacheKey] = parsedExpression;
          }
          return addInterceptor(parsedExpression, interceptorFn);

        case 'function':
          return addInterceptor(exp, interceptorFn);

        default:
          return addInterceptor(noop, interceptorFn);
      }
    }

    function $$getAst(exp) {
      var lexer = new Lexer($parseOptions);