Function $ParseProvider

code/songhop/www/lib/angular/angular.js:12576–12823

* @ngdoc provider * @name $parseProvider * * @description * `$parseProvider` can be used for configuring the default behavior of the ng.$parse $parse * service.

()

 *  service.
 */
function $ParseProvider() {
  var cacheDefault = createMap();
  var cacheExpensive = createMap();



  this.$get = ['$filter', '$sniffer', function($filter, $sniffer) {
    var $parseOptions = {
          csp: $sniffer.csp,
          expensiveChecks: false
        },
        $parseOptionsExpensive = {
          csp: $sniffer.csp,
          expensiveChecks: true
        };

    function wrapSharedExpression(exp) {
      var wrapped = exp;

      if (exp.sharedGetter) {
        wrapped = function $parseWrapper(self, locals) {
          return exp(self, locals);
        };
        wrapped.literal = exp.literal;
        wrapped.constant = exp.constant;
        wrapped.assign = exp.assign;
      }

      return wrapped;
    }

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

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

          var cache = (expensiveChecks ? cacheExpensive : cacheDefault);
          parsedExpression = cache[cacheKey];

          if (!parsedExpression) {
            if (exp.charAt(0) === ':' && exp.charAt(1) === ':') {
              oneTime = true;
              exp = exp.substring(2);
            }

            var parseOptions = expensiveChecks ? $parseOptionsExpensive : $parseOptions;
            var lexer = new Lexer(parseOptions);
            var parser = new Parser(lexer, $filter, parseOptions);
            parsedExpression = parser.parse(exp);

            if (parsedExpression.constant) {
              parsedExpression.$$watchDelegate = constantWatchDelegate;
            } else if (oneTime) {
              //oneTime is not part of the exp passed to the Parser so we may have to
              //wrap the parsedExpression before adding a $$watchDelegate
              parsedExpression = wrapSharedExpression(parsedExpression);