libs/js/jquery-mobile-1.2.0/node_modules/grunt/node_modules/uglify-js/lib/squeeze-more.js

   1 var jsp = require("./parse-js"),
   2     pro = require("./process"),
   3     slice = jsp.slice,
   4     member = jsp.member,
   5     curry = jsp.curry,
   6     MAP = pro.MAP,
   7     PRECEDENCE = jsp.PRECEDENCE,
   8     OPERATORS = jsp.OPERATORS;
   9
  10 function ast_squeeze_more(ast) {
  11     var w = pro.ast_walker(), walk = w.walk, scope;
  12     function with_scope(s, cont) {
  13         var save = scope, ret;
  14         scope = s;
  15         ret = cont();
  16         scope = save;
  17         return ret;
  18     };
  19     function _lambda(name, args, body) {
  20         return [ this[0], name, args, with_scope(body.scope, curry(MAP, body, walk)) ];
  21     };
  22     return w.with_walkers({
  23         "toplevel": function(body) {
  24             return [ this[0], with_scope(this.scope, curry(MAP, body, walk)) ];
  25         },
  26         "function": _lambda,
  27         "defun": _lambda,
  28         "new": function(ctor, args) {
  29             if (ctor[0] == "name") {
  30                 if (ctor[1] == "Array" && !scope.has("Array")) {
  31                     if (args.length != 1) {
  32                         return [ "array", args ];
  33                     } else {
  34                         return walk([ "call", [ "name", "Array" ], args ]);
  35                     }
  36                 } else if (ctor[1] == "Object" && !scope.has("Object")) {
  37                     if (!args.length) {
  38                         return [ "object", [] ];
  39                     } else {
  40                         return walk([ "call", [ "name", "Object" ], args ]);
  41                     }
  42                 } else if ((ctor[1] == "RegExp" || ctor[1] == "Function" || ctor[1] == "Error") && !scope.has(ctor[1])) {
  43                     return walk([ "call", [ "name", ctor[1] ], args]);
  44                 }
  45             }
  46         },
  47         "call": function(expr, args) {
  48             if (expr[0] == "dot" && expr[1][0] == "string" && args.length == 1
  49                 && (args[0][1] > 0 && expr[2] == "substring" || expr[2] == "substr")) {
  50                 return [ "call", [ "dot", expr[1], "slice"], args];
  51             }
  52             if (expr[0] == "dot" && expr[2] == "toString" && args.length == 0) {
  53                 // foo.toString()  ==>  foo+""
  54                 if (expr[1][0] == "string") return expr[1];
  55                 return [ "binary", "+", expr[1], [ "string", "" ]];
  56             }
  57             if (expr[0] == "name") {
  58                 if (expr[1] == "Array" && args.length != 1 && !scope.has("Array")) {
  59                     return [ "array", args ];
  60                 }
  61                 if (expr[1] == "Object" && !args.length && !scope.has("Object")) {
  62                     return [ "object", [] ];
  63                 }
  64                 if (expr[1] == "String" && !scope.has("String")) {
  65                     return [ "binary", "+", args[0], [ "string", "" ]];
  66                 }
  67             }
  68         }
  69     }, function() {
  70         return walk(pro.ast_add_scope(ast));
  71     });
  72 };
  73
  74 exports.ast_squeeze_more = ast_squeeze_more;
  75
  76 // Local variables:
  77 // js-indent-level: 4
  78 // End: