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https://github.com/mozilla/gecko-dev.git
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949 lines
28 KiB
JavaScript
949 lines
28 KiB
JavaScript
/* ***** BEGIN LICENSE BLOCK *****
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* vim: set ts=4 sw=4 et tw=80:
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*
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Narcissus JavaScript engine.
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*
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* The Initial Developer of the Original Code is
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* Brendan Eich <brendan@mozilla.org>.
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* Portions created by the Initial Developer are Copyright (C) 2004
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Narcissus - JS implemented in JS.
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*
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* Execution of parse trees.
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*
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* Standard classes except for eval, Function, Array, and String are borrowed
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* from the host JS environment. Function is metacircular. Array and String
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* are reflected via wrapping the corresponding native constructor and adding
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* an extra level of prototype-based delegation.
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*/
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const GLOBAL_CODE = 0, EVAL_CODE = 1, FUNCTION_CODE = 2;
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function ExecutionContext(type) {
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this.type = type;
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}
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var global = {
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// Value properties.
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NaN: NaN, Infinity: Infinity, undefined: undefined,
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// Function properties.
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eval: function eval(s) {
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if (typeof s != "string")
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return s;
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var x = ExecutionContext.current;
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var x2 = new ExecutionContext(EVAL_CODE);
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x2.thisObject = x.thisObject;
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x2.caller = x.caller;
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x2.callee = x.callee;
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x2.scope = x.scope;
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ExecutionContext.current = x2;
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try {
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execute(parse(s), x2);
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} catch (e if e == THROW) {
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x.result = x2.result;
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throw e;
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} finally {
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ExecutionContext.current = x;
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}
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return x2.result;
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},
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parseInt: parseInt, parseFloat: parseFloat,
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isNaN: isNaN, isFinite: isFinite,
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decodeURI: decodeURI, encodeURI: encodeURI,
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decodeURIComponent: decodeURIComponent,
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encodeURIComponent: encodeURIComponent,
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// Class constructors. Where ECMA-262 requires C.length == 1, we declare
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// a dummy formal parameter.
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Object: Object,
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Function: function Function(dummy) {
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var p = "", b = "", n = arguments.length;
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if (n) {
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var m = n - 1;
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if (m) {
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p += arguments[0];
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for (var k = 1; k < m; k++)
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p += "," + arguments[k];
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}
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b += arguments[m];
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}
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// XXX We want to pass a good file and line to the tokenizer.
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// Note the anonymous name to maintain parity with Spidermonkey.
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var t = new Tokenizer("anonymous(" + p + ") {" + b + "}");
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// NB: Use the STATEMENT_FORM constant since we don't want to push this
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// function onto the null compilation context.
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var f = FunctionDefinition(t, null, false, STATEMENT_FORM);
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var s = {object: global, parent: null};
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return new FunctionObject(f, s);
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},
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Array: function Array(dummy) {
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// Array when called as a function acts as a constructor.
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return GLOBAL.Array.apply(this, arguments);
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},
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String: function String(s) {
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// Called as function or constructor: convert argument to string type.
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s = arguments.length ? "" + s : "";
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if (this instanceof String) {
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// Called as constructor: save the argument as the string value
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// of this String object and return this object.
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this.value = s;
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return this;
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}
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return s;
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},
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Boolean: Boolean, Number: Number, Date: Date, RegExp: RegExp,
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Error: Error, EvalError: EvalError, RangeError: RangeError,
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ReferenceError: ReferenceError, SyntaxError: SyntaxError,
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TypeError: TypeError, URIError: URIError,
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// Other properties.
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Math: Math,
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// Extensions to ECMA.
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snarf: snarf, evaluate: evaluate,
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load: function load(s) {
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if (typeof s != "string")
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return s;
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evaluate(snarf(s), s, 1)
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},
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print: print, version: null
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};
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// Helper to avoid Object.prototype.hasOwnProperty polluting scope objects.
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function hasDirectProperty(o, p) {
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return Object.prototype.hasOwnProperty.call(o, p);
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}
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// Reflect a host class into the target global environment by delegation.
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function reflectClass(name, proto) {
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var gctor = global[name];
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gctor.__defineProperty__('prototype', proto, true, true, true);
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proto.__defineProperty__('constructor', gctor, false, false, true);
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return proto;
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}
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// Reflect Array -- note that all Array methods are generic.
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reflectClass('Array', new Array);
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// Reflect String, overriding non-generic methods.
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var gSp = reflectClass('String', new String);
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gSp.toSource = function () { return this.value.toSource(); };
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gSp.toString = function () { return this.value; };
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gSp.valueOf = function () { return this.value; };
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global.String.fromCharCode = String.fromCharCode;
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ExecutionContext.current = null;
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ExecutionContext.prototype = {
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caller: null,
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callee: null,
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scope: {object: global, parent: null},
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thisObject: global,
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result: undefined,
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target: null,
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ecma3OnlyMode: false
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};
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function Reference(base, propertyName, node) {
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this.base = base;
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this.propertyName = propertyName;
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this.node = node;
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}
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Reference.prototype.toString = function () { return this.node.getSource(); }
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function getValue(v) {
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if (v instanceof Reference) {
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if (!v.base) {
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throw new ReferenceError(v.propertyName + " is not defined",
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v.node.filename, v.node.lineno);
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}
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return v.base[v.propertyName];
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}
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return v;
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}
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function putValue(v, w, vn) {
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if (v instanceof Reference)
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return (v.base || global)[v.propertyName] = w;
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throw new ReferenceError("Invalid assignment left-hand side",
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vn.filename, vn.lineno);
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}
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function isPrimitive(v) {
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var t = typeof v;
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return (t == "object") ? v === null : t != "function";
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}
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function isObject(v) {
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var t = typeof v;
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return (t == "object") ? v !== null : t == "function";
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}
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// If r instanceof Reference, v == getValue(r); else v === r. If passed, rn
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// is the node whose execute result was r.
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function toObject(v, r, rn) {
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switch (typeof v) {
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case "boolean":
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return new global.Boolean(v);
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case "number":
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return new global.Number(v);
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case "string":
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return new global.String(v);
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case "function":
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return v;
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case "object":
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if (v !== null)
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return v;
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}
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var message = r + " (type " + (typeof v) + ") has no properties";
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throw rn ? new TypeError(message, rn.filename, rn.lineno)
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: new TypeError(message);
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}
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function execute(n, x) {
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var a, f, i, j, r, s, t, u, v;
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switch (n.type) {
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case FUNCTION:
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if (n.functionForm != DECLARED_FORM) {
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if (!n.name || n.functionForm == STATEMENT_FORM) {
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v = new FunctionObject(n, x.scope);
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if (n.functionForm == STATEMENT_FORM)
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x.scope.object.__defineProperty__(n.name, v, true);
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} else {
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t = new Object;
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x.scope = {object: t, parent: x.scope};
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try {
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v = new FunctionObject(n, x.scope);
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t.__defineProperty__(n.name, v, true, true);
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} finally {
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x.scope = x.scope.parent;
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}
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}
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}
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break;
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case SCRIPT:
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t = x.scope.object;
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a = n.funDecls;
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for (i = 0, j = a.length; i < j; i++) {
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s = a[i].name;
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f = new FunctionObject(a[i], x.scope);
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t.__defineProperty__(s, f, x.type != EVAL_CODE);
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}
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a = n.varDecls;
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for (i = 0, j = a.length; i < j; i++) {
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u = a[i];
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s = u.name;
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if (u.readOnly && hasDirectProperty(t, s)) {
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throw new TypeError("Redeclaration of const " + s,
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u.filename, u.lineno);
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}
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|
if (u.readOnly || !hasDirectProperty(t, s)) {
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t.__defineProperty__(s, undefined, x.type != EVAL_CODE,
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u.readOnly);
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}
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}
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// FALL THROUGH
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case BLOCK:
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for (i = 0, j = n.length; i < j; i++)
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execute(n[i], x);
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break;
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case IF:
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if (getValue(execute(n.condition, x)))
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execute(n.thenPart, x);
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else if (n.elsePart)
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execute(n.elsePart, x);
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break;
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|
case SWITCH:
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s = getValue(execute(n.discriminant, x));
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a = n.cases;
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var matchDefault = false;
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switch_loop:
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for (i = 0, j = a.length; ; i++) {
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if (i == j) {
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if (n.defaultIndex >= 0) {
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i = n.defaultIndex - 1; // no case matched, do default
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matchDefault = true;
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continue;
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}
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break; // no default, exit switch_loop
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}
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t = a[i]; // next case (might be default!)
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if (t.type == CASE) {
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u = getValue(execute(t.caseLabel, x));
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} else {
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if (!matchDefault) // not defaulting, skip for now
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continue;
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u = s; // force match to do default
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}
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if (u === s) {
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for (;;) { // this loop exits switch_loop
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if (t.statements.length) {
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try {
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execute(t.statements, x);
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} catch (e if e == BREAK && x.target == n) {
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break switch_loop;
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|
}
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}
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if (++i == j)
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break switch_loop;
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t = a[i];
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}
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// NOT REACHED
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}
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}
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break;
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case FOR:
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n.setup && getValue(execute(n.setup, x));
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// FALL THROUGH
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case WHILE:
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while (!n.condition || getValue(execute(n.condition, x))) {
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try {
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execute(n.body, x);
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} catch (e if e == BREAK && x.target == n) {
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break;
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} catch (e if e == CONTINUE && x.target == n) {
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// Must run the update expression.
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}
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n.update && getValue(execute(n.update, x));
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}
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break;
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case FOR_IN:
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u = n.varDecl;
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if (u)
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execute(u, x);
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r = n.iterator;
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s = execute(n.object, x);
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v = getValue(s);
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|
|
// ECMA deviation to track extant browser JS implementation behavior.
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t = (v == null && !x.ecma3OnlyMode) ? v : toObject(v, s, n.object);
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a = [];
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for (i in t)
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a.push(i);
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for (i = 0, j = a.length; i < j; i++) {
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putValue(execute(r, x), a[i], r);
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try {
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execute(n.body, x);
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} catch (e if e == BREAK && x.target == n) {
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break;
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} catch (e if e == CONTINUE && x.target == n) {
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continue;
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}
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}
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break;
|
|
|
|
case DO:
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|
do {
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try {
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execute(n.body, x);
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} catch (e if e == BREAK && x.target == n) {
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break;
|
|
} catch (e if e == CONTINUE && x.target == n) {
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|
continue;
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|
}
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|
} while (getValue(execute(n.condition, x)));
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break;
|
|
|
|
case BREAK:
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case CONTINUE:
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x.target = n.target;
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throw n.type;
|
|
|
|
case TRY:
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|
try {
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|
execute(n.tryBlock, x);
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|
} catch (e if e == THROW && (j = n.catchClauses.length)) {
|
|
e = x.result;
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|
x.result = undefined;
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|
for (i = 0; ; i++) {
|
|
if (i == j) {
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|
x.result = e;
|
|
throw THROW;
|
|
}
|
|
t = n.catchClauses[i];
|
|
x.scope = {object: {}, parent: x.scope};
|
|
x.scope.object.__defineProperty__(t.varName, e, true);
|
|
try {
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|
if (t.guard && !getValue(execute(t.guard, x)))
|
|
continue;
|
|
execute(t.block, x);
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|
break;
|
|
} finally {
|
|
x.scope = x.scope.parent;
|
|
}
|
|
}
|
|
} finally {
|
|
if (n.finallyBlock)
|
|
execute(n.finallyBlock, x);
|
|
}
|
|
break;
|
|
|
|
case THROW:
|
|
x.result = getValue(execute(n.exception, x));
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|
throw THROW;
|
|
|
|
case RETURN:
|
|
x.result = getValue(execute(n.value, x));
|
|
throw RETURN;
|
|
|
|
case WITH:
|
|
r = execute(n.object, x);
|
|
t = toObject(getValue(r), r, n.object);
|
|
x.scope = {object: t, parent: x.scope};
|
|
try {
|
|
execute(n.body, x);
|
|
} finally {
|
|
x.scope = x.scope.parent;
|
|
}
|
|
break;
|
|
|
|
case VAR:
|
|
case CONST:
|
|
for (i = 0, j = n.length; i < j; i++) {
|
|
u = n[i].initializer;
|
|
if (!u)
|
|
continue;
|
|
t = n[i].name;
|
|
for (s = x.scope; s; s = s.parent) {
|
|
if (hasDirectProperty(s.object, t))
|
|
break;
|
|
}
|
|
u = getValue(execute(u, x));
|
|
if (n.type == CONST)
|
|
s.object.__defineProperty__(t, u, x.type != EVAL_CODE, true);
|
|
else
|
|
s.object[t] = u;
|
|
}
|
|
break;
|
|
|
|
case DEBUGGER:
|
|
throw "NYI: " + tokens[n.type];
|
|
|
|
case SEMICOLON:
|
|
if (n.expression)
|
|
x.result = getValue(execute(n.expression, x));
|
|
break;
|
|
|
|
case LABEL:
|
|
try {
|
|
execute(n.statement, x);
|
|
} catch (e if e == BREAK && x.target == n) {
|
|
}
|
|
break;
|
|
|
|
case COMMA:
|
|
for (i = 0, j = n.length; i < j; i++)
|
|
v = getValue(execute(n[i], x));
|
|
break;
|
|
|
|
case ASSIGN:
|
|
r = execute(n[0], x);
|
|
t = n[0].assignOp;
|
|
if (t)
|
|
u = getValue(r);
|
|
v = getValue(execute(n[1], x));
|
|
if (t) {
|
|
switch (t) {
|
|
case BITWISE_OR: v = u | v; break;
|
|
case BITWISE_XOR: v = u ^ v; break;
|
|
case BITWISE_AND: v = u & v; break;
|
|
case LSH: v = u << v; break;
|
|
case RSH: v = u >> v; break;
|
|
case URSH: v = u >>> v; break;
|
|
case PLUS: v = u + v; break;
|
|
case MINUS: v = u - v; break;
|
|
case MUL: v = u * v; break;
|
|
case DIV: v = u / v; break;
|
|
case MOD: v = u % v; break;
|
|
}
|
|
}
|
|
putValue(r, v, n[0]);
|
|
break;
|
|
|
|
case HOOK:
|
|
v = getValue(execute(n[0], x)) ? getValue(execute(n[1], x))
|
|
: getValue(execute(n[2], x));
|
|
break;
|
|
|
|
case OR:
|
|
v = getValue(execute(n[0], x)) || getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case AND:
|
|
v = getValue(execute(n[0], x)) && getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case BITWISE_OR:
|
|
v = getValue(execute(n[0], x)) | getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case BITWISE_XOR:
|
|
v = getValue(execute(n[0], x)) ^ getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case BITWISE_AND:
|
|
v = getValue(execute(n[0], x)) & getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case EQ:
|
|
v = getValue(execute(n[0], x)) == getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case NE:
|
|
v = getValue(execute(n[0], x)) != getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case STRICT_EQ:
|
|
v = getValue(execute(n[0], x)) === getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case STRICT_NE:
|
|
v = getValue(execute(n[0], x)) !== getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case LT:
|
|
v = getValue(execute(n[0], x)) < getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case LE:
|
|
v = getValue(execute(n[0], x)) <= getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case GE:
|
|
v = getValue(execute(n[0], x)) >= getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case GT:
|
|
v = getValue(execute(n[0], x)) > getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case IN:
|
|
v = getValue(execute(n[0], x)) in getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case INSTANCEOF:
|
|
t = getValue(execute(n[0], x));
|
|
u = getValue(execute(n[1], x));
|
|
if (isObject(u) && typeof u.__hasInstance__ == "function")
|
|
v = u.__hasInstance__(t);
|
|
else
|
|
v = t instanceof u;
|
|
break;
|
|
|
|
case LSH:
|
|
v = getValue(execute(n[0], x)) << getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case RSH:
|
|
v = getValue(execute(n[0], x)) >> getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case URSH:
|
|
v = getValue(execute(n[0], x)) >>> getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case PLUS:
|
|
v = getValue(execute(n[0], x)) + getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case MINUS:
|
|
v = getValue(execute(n[0], x)) - getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case MUL:
|
|
v = getValue(execute(n[0], x)) * getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case DIV:
|
|
v = getValue(execute(n[0], x)) / getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case MOD:
|
|
v = getValue(execute(n[0], x)) % getValue(execute(n[1], x));
|
|
break;
|
|
|
|
case DELETE:
|
|
t = execute(n[0], x);
|
|
v = !(t instanceof Reference) || delete t.base[t.propertyName];
|
|
break;
|
|
|
|
case VOID:
|
|
getValue(execute(n[0], x));
|
|
break;
|
|
|
|
case TYPEOF:
|
|
t = execute(n[0], x);
|
|
if (t instanceof Reference)
|
|
t = t.base ? t.base[t.propertyName] : undefined;
|
|
v = typeof t;
|
|
break;
|
|
|
|
case NOT:
|
|
v = !getValue(execute(n[0], x));
|
|
break;
|
|
|
|
case BITWISE_NOT:
|
|
v = ~getValue(execute(n[0], x));
|
|
break;
|
|
|
|
case UNARY_PLUS:
|
|
v = +getValue(execute(n[0], x));
|
|
break;
|
|
|
|
case UNARY_MINUS:
|
|
v = -getValue(execute(n[0], x));
|
|
break;
|
|
|
|
case INCREMENT:
|
|
case DECREMENT:
|
|
t = execute(n[0], x);
|
|
u = Number(getValue(t));
|
|
if (n.postfix)
|
|
v = u;
|
|
putValue(t, (n.type == INCREMENT) ? ++u : --u, n[0]);
|
|
if (!n.postfix)
|
|
v = u;
|
|
break;
|
|
|
|
case DOT:
|
|
r = execute(n[0], x);
|
|
t = getValue(r);
|
|
u = n[1].value;
|
|
v = new Reference(toObject(t, r, n[0]), u, n);
|
|
break;
|
|
|
|
case INDEX:
|
|
r = execute(n[0], x);
|
|
t = getValue(r);
|
|
u = getValue(execute(n[1], x));
|
|
v = new Reference(toObject(t, r, n[0]), String(u), n);
|
|
break;
|
|
|
|
case LIST:
|
|
// Curse ECMA for specifying that arguments is not an Array object!
|
|
v = {};
|
|
for (i = 0, j = n.length; i < j; i++) {
|
|
u = getValue(execute(n[i], x));
|
|
v.__defineProperty__(i, u, false, false, true);
|
|
}
|
|
v.__defineProperty__('length', i, false, false, true);
|
|
break;
|
|
|
|
case CALL:
|
|
r = execute(n[0], x);
|
|
a = execute(n[1], x);
|
|
f = getValue(r);
|
|
if (isPrimitive(f) || typeof f.__call__ != "function") {
|
|
throw new TypeError(r + " is not callable",
|
|
n[0].filename, n[0].lineno);
|
|
}
|
|
t = (r instanceof Reference) ? r.base : null;
|
|
if (t instanceof Activation)
|
|
t = null;
|
|
v = f.__call__(t, a, x);
|
|
break;
|
|
|
|
case NEW:
|
|
case NEW_WITH_ARGS:
|
|
r = execute(n[0], x);
|
|
f = getValue(r);
|
|
if (n.type == NEW) {
|
|
a = {};
|
|
a.__defineProperty__('length', 0, false, false, true);
|
|
} else {
|
|
a = execute(n[1], x);
|
|
}
|
|
if (isPrimitive(f) || typeof f.__construct__ != "function") {
|
|
throw new TypeError(r + " is not a constructor",
|
|
n[0].filename, n[0].lineno);
|
|
}
|
|
v = f.__construct__(a, x);
|
|
break;
|
|
|
|
case ARRAY_INIT:
|
|
v = [];
|
|
for (i = 0, j = n.length; i < j; i++) {
|
|
if (n[i])
|
|
v[i] = getValue(execute(n[i], x));
|
|
}
|
|
v.length = j;
|
|
break;
|
|
|
|
case OBJECT_INIT:
|
|
v = {};
|
|
for (i = 0, j = n.length; i < j; i++) {
|
|
t = n[i];
|
|
if (t.type == PROPERTY_INIT) {
|
|
v[t[0].value] = getValue(execute(t[1], x));
|
|
} else {
|
|
f = new FunctionObject(t, x.scope);
|
|
u = (t.type == GETTER) ? '__defineGetter__'
|
|
: '__defineSetter__';
|
|
v[u](t.name, thunk(f, x));
|
|
}
|
|
}
|
|
break;
|
|
|
|
case NULL:
|
|
v = null;
|
|
break;
|
|
|
|
case THIS:
|
|
v = x.thisObject;
|
|
break;
|
|
|
|
case TRUE:
|
|
v = true;
|
|
break;
|
|
|
|
case FALSE:
|
|
v = false;
|
|
break;
|
|
|
|
case IDENTIFIER:
|
|
for (s = x.scope; s; s = s.parent) {
|
|
if (n.value in s.object)
|
|
break;
|
|
}
|
|
v = new Reference(s && s.object, n.value, n);
|
|
break;
|
|
|
|
case NUMBER:
|
|
case STRING:
|
|
case REGEXP:
|
|
v = n.value;
|
|
break;
|
|
|
|
case GROUP:
|
|
v = execute(n[0], x);
|
|
break;
|
|
|
|
default:
|
|
throw "PANIC: unknown operation " + n.type + ": " + uneval(n);
|
|
}
|
|
|
|
return v;
|
|
}
|
|
|
|
function Activation(f, a) {
|
|
for (var i = 0, j = f.params.length; i < j; i++)
|
|
this.__defineProperty__(f.params[i], a[i], true);
|
|
this.__defineProperty__('arguments', a, true);
|
|
}
|
|
|
|
// Null Activation.prototype's proto slot so that Object.prototype.* does not
|
|
// pollute the scope of heavyweight functions. Also delete its 'constructor'
|
|
// property so that it doesn't pollute function scopes. But first, we must
|
|
// copy __defineProperty__ down from Object.prototype.
|
|
|
|
Activation.prototype.__defineProperty__ = Object.prototype.__defineProperty__;
|
|
Activation.prototype.__proto__ = null;
|
|
delete Activation.prototype.constructor;
|
|
|
|
function FunctionObject(node, scope) {
|
|
this.node = node;
|
|
this.scope = scope;
|
|
this.__defineProperty__('length', node.params.length, true, true, true);
|
|
var proto = {};
|
|
this.__defineProperty__('prototype', proto, true);
|
|
proto.__defineProperty__('constructor', this, false, false, true);
|
|
}
|
|
|
|
var FOp = FunctionObject.prototype = {
|
|
// Internal methods.
|
|
__call__: function (t, a, x) {
|
|
var x2 = new ExecutionContext(FUNCTION_CODE);
|
|
x2.thisObject = t || global;
|
|
x2.caller = x;
|
|
x2.callee = this;
|
|
a.__defineProperty__('callee', this, false, false, true);
|
|
var f = this.node;
|
|
x2.scope = {object: new Activation(f, a), parent: this.scope};
|
|
|
|
ExecutionContext.current = x2;
|
|
try {
|
|
execute(f.body, x2);
|
|
} catch (e if e == RETURN) {
|
|
return x2.result;
|
|
} catch (e if e == THROW) {
|
|
x.result = x2.result;
|
|
throw THROW;
|
|
} finally {
|
|
ExecutionContext.current = x;
|
|
}
|
|
return undefined;
|
|
},
|
|
|
|
__construct__: function (a, x) {
|
|
var o = new Object;
|
|
var p = this.prototype;
|
|
if (isObject(p))
|
|
o.__proto__ = p;
|
|
// else o.__proto__ defaulted to Object.prototype
|
|
|
|
var v = this.__call__(o, a, x);
|
|
if (isObject(v))
|
|
return v;
|
|
return o;
|
|
},
|
|
|
|
__hasInstance__: function (v) {
|
|
if (isPrimitive(v))
|
|
return false;
|
|
var p = this.prototype;
|
|
if (isPrimitive(p)) {
|
|
throw new TypeError("'prototype' property is not an object",
|
|
this.node.filename, this.node.lineno);
|
|
}
|
|
var o;
|
|
while ((o = v.__proto__)) {
|
|
if (o == p)
|
|
return true;
|
|
v = o;
|
|
}
|
|
return false;
|
|
},
|
|
|
|
// Standard methods.
|
|
toString: function () {
|
|
return this.node.getSource();
|
|
},
|
|
|
|
apply: function (t, a) {
|
|
// Curse ECMA again!
|
|
if (typeof this.__call__ != "function") {
|
|
throw new TypeError("Function.prototype.apply called on" +
|
|
" uncallable object");
|
|
}
|
|
|
|
if (t === undefined || t === null)
|
|
t = global;
|
|
else if (typeof t != "object")
|
|
t = toObject(t, t);
|
|
|
|
if (a === undefined || a === null) {
|
|
a = {};
|
|
a.__defineProperty__('length', 0, false, false, true);
|
|
} else if (a instanceof Array) {
|
|
var v = {};
|
|
for (var i = 0, j = a.length; i < j; i++)
|
|
v.__defineProperty__(i, a[i], false, false, true);
|
|
v.__defineProperty__('length', i, false, false, true);
|
|
a = v;
|
|
} else if (!(a instanceof Object)) {
|
|
// XXX check for a non-arguments object
|
|
throw new TypeError("Second argument to Function.prototype.apply" +
|
|
" must be an array or arguments object",
|
|
this.node.filename, this.node.lineno);
|
|
}
|
|
|
|
return this.__call__(t, a, ExecutionContext.current);
|
|
},
|
|
|
|
call: function (t) {
|
|
// Curse ECMA a third time!
|
|
var a = Array.prototype.splice.call(arguments, 1);
|
|
return this.apply(t, a);
|
|
}
|
|
};
|
|
|
|
// Connect Function.prototype and Function.prototype.constructor in global.
|
|
reflectClass('Function', FOp);
|
|
|
|
// Help native and host-scripted functions be like FunctionObjects.
|
|
var Fp = Function.prototype;
|
|
var REp = RegExp.prototype;
|
|
|
|
if (!('__call__' in Fp)) {
|
|
Fp.__defineProperty__('__call__', function (t, a, x) {
|
|
// Curse ECMA yet again!
|
|
a = Array.prototype.splice.call(a, 0, a.length);
|
|
return this.apply(t, a);
|
|
}, true, true, true);
|
|
|
|
REp.__defineProperty__('__call__', function (t, a, x) {
|
|
a = Array.prototype.splice.call(a, 0, a.length);
|
|
return this.exec.apply(this, a);
|
|
}, true, true, true);
|
|
|
|
Fp.__defineProperty__('__construct__', function (a, x) {
|
|
a = Array.prototype.splice.call(a, 0, a.length);
|
|
return this.__applyConstructor__(a);
|
|
}, true, true, true);
|
|
|
|
// Since we use native functions such as Date along with host ones such
|
|
// as global.eval, we want both to be considered instances of the native
|
|
// Function constructor.
|
|
Fp.__defineProperty__('__hasInstance__', function (v) {
|
|
return v instanceof Function || v instanceof global.Function;
|
|
}, true, true, true);
|
|
}
|
|
|
|
function thunk(f, x) {
|
|
return function () { return f.__call__(this, arguments, x); };
|
|
}
|
|
|
|
function evaluate(s, f, l) {
|
|
if (typeof s != "string")
|
|
return s;
|
|
|
|
var x = ExecutionContext.current;
|
|
var x2 = new ExecutionContext(GLOBAL_CODE);
|
|
ExecutionContext.current = x2;
|
|
try {
|
|
execute(parse(s, f, l), x2);
|
|
} catch (e if e == THROW) {
|
|
if (x) {
|
|
x.result = x2.result;
|
|
throw THROW;
|
|
}
|
|
throw x2.result;
|
|
} finally {
|
|
ExecutionContext.current = x;
|
|
}
|
|
return x2.result;
|
|
}
|