builtinFunction.js

/*
 Copyright (c) 2015, Kotaro Endo.
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    copyright notice, this list of conditions and the following
    disclaimer in the documentation and/or other materials provided
    with the distribution.
 
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    contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.
 
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 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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*/

'use strict';

// ECMAScript 5.1: 15.3 Function Objects

function Function_Call(thisValue, argumentsList) {
	return Function_Construct(argumentsList);
}

function Function_Construct(argumentsList) {
	var argCount = argumentsList.length;
	var P = "";
	if (argCount === 0) {
		var body = "";
	}
	else if (argCount === 1) {
		var body = argumentsList[0];
	}
	else {
		var firstArg = argumentsList[0];
		var P = ToString(firstArg);
		var k = 2;
		while (k < argCount) {
			var nextArg = argumentsList[k - 1];
			var P = P + "," + ToString(nextArg);
			k++;
		}
		var body = argumentsList[k - 1];
	}
	var body = ToString(body);
	var parameters = theParser.readFunctionParameters(P);
	var body = theParser.readFunctionCode(body, parameters);
	return FunctionObject(parameters, body, theGlobalEnvironment, body.strict);
}

function Function_prototype_toString(thisValue, argumentsList) {
	var func = thisValue;
	if (IsCallable(func) === false) throw VMTypeError();
	return "function anonymous(){}";
}

function Function_prototype_apply(thisValue, argumentsList) {

	var func = thisValue;
	var thisArg = argumentsList[0];
	var argArray = argumentsList[1];
	if (IsCallable(func) === false) throw VMTypeError();
	if (argArray === null || argArray === undefined) return func.Call(thisArg, []);
	if (Type(argArray) !== "Object") throw VMTypeError();
	var len = argArray.Get("length");
	var n = ToUint32(len);
	var argList = [];
	var index = 0;
	while (index < n) {
		var indexName = ToString(index);
		var nextArg = argArray.Get(indexName);
		argList.push(nextArg);
		index = index + 1;
	}
	return func.Call(thisArg, argList);
}

function Function_prototype_call(thisValue, argumentsList) {
	var func = thisValue;
	var thisArg = argumentsList[0];
	if (IsCallable(func) === false) throw VMTypeError();
	var argList = [];
	if (argumentsList.length > 1) {
		for (var i = 1; i < argumentsList.length; i++) {
			argList.push(argumentsList[i]);
		}
	}
	return func.Call(thisArg, argList);
}

function Function_prototype_bind(thisValue, argumentsList) {
	var thisArg = argumentsList[0];
	var Target = thisValue;
	if (IsCallable(Target) === false) throw VMTypeError();
	var A = [];
	for (var i = 1; i < argumentsList.length; i++) {
		A.push(argumentsList[i]);
	}
	var F = VMObject();
	setAllTheInternalMethods(F);
	F.Get = FunctionObject_Get;
	F.TargetFunction = Target;
	F.BoundThis = thisArg;
	F.BoundArgs = A;
	F.Class = "Function";
	F.Prototype = builtin_Function_prototype;
	F.Call = BindFunctionObject_Call;
	F.Construct = BindFunctionObject_Construct;
	F.HasInstance = BindFunctionObject_HasInstance;
	if (Target.Class === "Function") {
		var L = Target.Get("length") - A.length;
		defineFinal(F, "length", max(0, L));
	}
	else {
		defineFinal(F, "length", 0);
	}
	F.Extensible = true;
	var thrower = theThrowTypeError;
	F.DefineOwnProperty("caller", PropertyDescriptor({
		Get : thrower,
		Set : thrower,
		Enumerable : false,
		Configurable : false
	}), false);
	F.DefineOwnProperty("arguments", PropertyDescriptor({
		Get : thrower,
		Set : thrower,
		Enumerable : false,
		Configurable : false
	}), false);
	return F;
}

function BindFunctionObject_Call(thisValue, argumentsList) {
	var F = this;
	var ExtraArgs = argumentsList;
	var boundArgs = F.BoundArgs;
	var boundThis = F.BoundThis;
	var target = F.TargetFunction;
	var args = boundArgs.concat(ExtraArgs);
	return target.Call(boundThis, args);
}

function BindFunctionObject_Construct(argumentsList) {
	var F = this;
	var ExtraArgs = argumentsList;
	var target = F.TargetFunction;
	if (target.Construct === undefined) throw VMTypeError();
	var boundArgs = F.BoundArgs;
	var args = boundArgs.concat(ExtraArgs);
	return target.Construct(args);
}

function BindFunctionObject_HasInstance(V) {
	var F = this;
	var target = F.TargetFunction;
	if (target.HasInstance === undefined) throw VMTypeError();
	return target.HasInstance(V);
}

function FunctionObject_Get(P) {
	var F = this;
	var v = default_Get.call(F, P);
	if (P === "caller" && Type(v) === "Object" && v.Class === "Function" && v.Code !== undefined && v.Code.strict) throw VMTypeError();
	return v;
}

function FunctionObject_HasInstance(V) {
	var F = this;
	if (Type(V) !== "Object") return false;
	var O = F.Get("prototype");
	if (Type(O) !== "Object") throw VMTypeError();
	while (true) {
		var V = V.Prototype;
		if (V === null) return false;
		if (O === V) return true;
	}
}