Imported Upstream version 4.6.2

install/ui/util/uglifyjs/lib/squeeze-more.js

@@ -0,0 +1,78 @@
+var jsp = require("./parse-js"),
+    pro = require("./process"),
+    slice = jsp.slice,
+    member = jsp.member,
+    curry = jsp.curry,
+    MAP = pro.MAP,
+    PRECEDENCE = jsp.PRECEDENCE,
+    OPERATORS = jsp.OPERATORS;
+
+function ast_squeeze_more(ast) {
+    var w = pro.ast_walker(), walk = w.walk, scope;
+    function with_scope(s, cont) {
+        var save = scope, ret;
+        scope = s;
+        ret = cont();
+        scope = save;
+        return ret;
+    };
+    function _lambda(name, args, body) {
+        return [ this[0], name, args, with_scope(body.scope, curry(MAP, body, walk)) ];
+    };
+    return w.with_walkers({
+        "toplevel": function(body) {
+            return [ this[0], with_scope(this.scope, curry(MAP, body, walk)) ];
+        },
+        "function": _lambda,
+        "defun": _lambda,
+        "new": function(ctor, args) {
+            if (ctor[0] == "name") {
+                if (ctor[1] == "Array" && !scope.has("Array")) {
+                    if (args.length != 1) {
+                        return [ "array", args ];
+                    } else {
+                        return walk([ "call", [ "name", "Array" ], args ]);
+                    }
+                } else if (ctor[1] == "Object" && !scope.has("Object")) {
+                    if (!args.length) {
+                        return [ "object", [] ];
+                    } else {
+                        return walk([ "call", [ "name", "Object" ], args ]);
+                    }
+                } else if ((ctor[1] == "RegExp" || ctor[1] == "Function" || ctor[1] == "Error") && !scope.has(ctor[1])) {
+                    return walk([ "call", [ "name", ctor[1] ], args]);
+                }
+            }
+        },
+        "call": function(expr, args) {
+            if (expr[0] == "dot" && expr[1][0] == "string" && args.length == 1
+                && (args[0][1] > 0 && expr[2] == "substring" || expr[2] == "substr")) {
+                return [ "call", [ "dot", expr[1], "slice"], args];
+            }
+            if (expr[0] == "dot" && expr[2] == "toString" && args.length == 0) {
+                // foo.toString()  ==>  foo+""
+                if (expr[1][0] == "string") return expr[1];
+                return [ "binary", "+", expr[1], [ "string", "" ]];
+            }
+            if (expr[0] == "name") {
+                if (expr[1] == "Array" && args.length != 1 && !scope.has("Array")) {
+                    return [ "array", args ];
+                }
+                if (expr[1] == "Object" && !args.length && !scope.has("Object")) {
+                    return [ "object", [] ];
+                }
+                if (expr[1] == "String" && !scope.has("String")) {
+                    return [ "binary", "+", args[0], [ "string", "" ]];
+                }
+            }
+        }
+    }, function() {
+        return walk(pro.ast_add_scope(ast));
+    });
+};
+
+exports.ast_squeeze_more = ast_squeeze_more;
+
+// Local variables:
+// js-indent-level: 4
+// End: