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/*
* This file is part of the KDE libraries
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "internal.h"
#include <assert.h>
#include <stdio.h>
#include "kjs.h"
#include "object.h"
#include "types.h"
#include "operations.h"
#include "regexp.h"
#include "nodes.h"
#include "lexer.h"
#include "collector.h"
#include "debugger.h"
#define I18N_NOOP(s) s
extern int kjsyyparse();
using namespace KJS;
const TypeInfo UndefinedImp::info = { "Undefined", UndefinedType, 0, 0, 0 };
const TypeInfo NullImp::info = { "Null", NullType, 0, 0, 0 };
const TypeInfo NumberImp::info = { "Number", NumberType, 0, 0,0 };
const TypeInfo StringImp::info = { "String", StringType, 0, 0, 0 };
const TypeInfo BooleanImp::info = { "Boolean", BooleanType, 0, 0, 0 };
const TypeInfo CompletionImp::info = { "Completion", CompletionType, 0, 0, 0 };
const TypeInfo ReferenceImp::info = { "Reference", ReferenceType, 0, 0, 0 };
UndefinedImp *UndefinedImp::staticUndefined = 0;
UndefinedImp::UndefinedImp()
{
}
KJSO UndefinedImp::toPrimitive(Type) const
{
return (Imp*)this;
}
Boolean UndefinedImp::toBoolean() const
{
return Boolean(false);
}
Number UndefinedImp::toNumber() const
{
return Number(NaN);
}
String UndefinedImp::toString() const
{
return String("undefined");
}
Object UndefinedImp::toObject() const
{
return Error::createObject(TypeError, I18N_NOOP("Undefined value"));
}
NullImp *NullImp::staticNull = 0;
NullImp::NullImp()
{
}
KJSO NullImp::toPrimitive(Type) const
{
return (Imp*)this;
}
Boolean NullImp::toBoolean() const
{
return Boolean(false);
}
Number NullImp::toNumber() const
{
return Number(0);
}
String NullImp::toString() const
{
return String("null");
}
Object NullImp::toObject() const
{
return Error::createObject(TypeError, I18N_NOOP("Null value"));
}
BooleanImp* BooleanImp::staticTrue = 0;
BooleanImp* BooleanImp::staticFalse = 0;
KJSO BooleanImp::toPrimitive(Type) const
{
return (Imp*)this;
}
Boolean BooleanImp::toBoolean() const
{
return Boolean((BooleanImp*)this);
}
Number BooleanImp::toNumber() const
{
return Number(val ? 1 : 0);
}
String BooleanImp::toString() const
{
return String(val ? "true" : "false");
}
Object BooleanImp::toObject() const
{
return Object::create(BooleanClass, Boolean((BooleanImp*)this));
}
NumberImp::NumberImp(double v)
: val(v)
{
}
KJSO NumberImp::toPrimitive(Type) const
{
return (Imp*)this;
}
Boolean NumberImp::toBoolean() const
{
bool b = !((val == 0) /* || (iVal() == N0) */ || isNaN(val));
return Boolean(b);
}
Number NumberImp::toNumber() const
{
return Number((NumberImp*)this);
}
String NumberImp::toString() const
{
return String(UString::from(val));
}
Object NumberImp::toObject() const
{
return Object::create(NumberClass, Number((NumberImp*)this));
}
StringImp::StringImp(const UString& v)
: val(v)
{
}
KJSO StringImp::toPrimitive(Type) const
{
return (Imp*)this;
}
Boolean StringImp::toBoolean() const
{
return Boolean(val.size() > 0);
}
Number StringImp::toNumber() const
{
return Number(val.toDouble());
}
String StringImp::toString() const
{
return String((StringImp*)this);
}
Object StringImp::toObject() const
{
return Object::create(StringClass, String((StringImp*)this));
}
ReferenceImp::ReferenceImp(const KJSO& b, const UString& p)
: base(b), prop(p)
{
}
void ReferenceImp::mark(Imp*)
{
Imp::mark();
Imp *im = base.imp();
if (im && !im->marked())
im->mark();
}
CompletionImp::CompletionImp(Compl c, const KJSO& v, const UString& t)
: comp(c), val(v), tar(t)
{
}
void CompletionImp::mark(Imp*)
{
Imp::mark();
Imp *im = val.imp();
if (im && !im->marked())
im->mark();
}
RegExpImp::RegExpImp()
: ObjectImp(RegExpClass), reg(0L)
{
}
RegExpImp::~RegExpImp()
{
delete reg;
}
// ECMA 10.2
Context::Context(CodeType type, Context *callingContext,
FunctionImp *func, const List *args, Imp *thisV)
{
Global glob(Global::current());
// create and initialize activation object (ECMA 10.1.6)
if (type == FunctionCode || type == AnonymousCode || type == HostCode) {
activation = new ActivationImp(func, args);
variable = activation;
} else {
activation = KJSO();
variable = glob;
}
// ECMA 10.2
switch(type) {
case EvalCode:
if (callingContext) {
scopeChain = callingContext->copyOfChain();
variable = callingContext->variableObject();
thisVal = callingContext->thisValue();
break;
} // else same as GlobalCode
case GlobalCode:
scopeChain = new List();
scopeChain->append(glob);
thisVal = glob.imp();
break;
case FunctionCode:
case AnonymousCode:
if (type == FunctionCode) {
scopeChain = ((DeclaredFunctionImp*)func)->scopeChain()->copy();
scopeChain->prepend(activation);
} else {
scopeChain = new List();
scopeChain->append(activation);
scopeChain->append(glob);
}
variable = activation; /* TODO: DontDelete ? (ECMA 10.2.3) */
if (thisV->type() >= ObjectType) {
thisVal = thisV;
}
else
thisVal = glob.imp();
break;
case HostCode:
if (thisV->type() >= ObjectType)
thisVal = thisV;
else
thisVal = glob;
variable = activation; /* TODO: DontDelete (ECMA 10.2.4) */
scopeChain = new List();
scopeChain->append(activation);
if (func->hasAttribute(ImplicitThis))
scopeChain->append(KJSO(thisVal));
if (func->hasAttribute(ImplicitParents)) {
/* TODO ??? */
}
scopeChain->append(glob);
break;
}
}
Context::~Context()
{
delete scopeChain;
}
Context *Context::current()
{
return KJScriptImp::curr ? KJScriptImp::curr->con : 0L;
}
void Context::setCurrent(Context *c)
{
KJScriptImp::current()->con = c;
}
void Context::pushScope(const KJSO &s)
{
scopeChain->prepend(s);
}
void Context::popScope()
{
scopeChain->removeFirst();
}
List* Context::copyOfChain()
{
return scopeChain->copy();
}
AnonymousFunction::AnonymousFunction()
: Function(0L)
{
/* TODO */
}
DeclaredFunctionImp::DeclaredFunctionImp(const UString &n,
FunctionBodyNode *b, const List *sc)
: ConstructorImp(n), body(b), scopes(sc->copy())
{
}
DeclaredFunctionImp::~DeclaredFunctionImp()
{
delete scopes;
}
// step 2 of ECMA 13.2.1. rest in FunctionImp::executeCall()
Completion DeclaredFunctionImp::execute(const List &)
{
/* TODO */
#ifdef KJS_DEBUGGER
Debugger *dbg = KJScriptImp::current()->debugger();
int oldSourceId = -1;
if (dbg) {
oldSourceId = dbg->sourceId();
dbg->setSourceId(body->sourceId());
}
#endif
Completion result = body->execute();
#ifdef KJS_DEBUGGER
if (dbg) {
dbg->setSourceId(oldSourceId);
}
#endif
if (result.complType() == Throw || result.complType() == ReturnValue)
return result;
return Completion(Normal, Undefined()); /* TODO: or ReturnValue ? */
}
// ECMA 13.2.2 [[Construct]]
Object DeclaredFunctionImp::construct(const List &args)
{
Object obj(ObjectClass);
KJSO p = get("prototype");
if (p.isObject())
obj.setPrototype(p);
else
obj.setPrototype(Global::current().objectPrototype());
KJSO res = executeCall(obj.imp(), &args);
Object v = Object::dynamicCast(res);
if (v.isNull())
return obj;
else
return v;
}
Completion AnonymousFunction::execute(const List &)
{
/* TODO */
return Completion(Normal, Null());
}
// ECMA 10.1.8
class ArgumentsObject : public ObjectImp {
public:
ArgumentsObject(FunctionImp *func, const List *args);
};
ArgumentsObject::ArgumentsObject(FunctionImp *func, const List *args)
: ObjectImp(UndefClass)
{
put("callee", Function(func), DontEnum);
if (args) {
put("length", Number(args->size()), DontEnum);
ListIterator arg = args->begin();
for (int i = 0; arg != args->end(); arg++, i++) {
put(UString::from(i), *arg, DontEnum);
}
}
}
const TypeInfo ActivationImp::info = { "Activation", ActivationType, 0, 0, 0 };
// ECMA 10.1.6
ActivationImp::ActivationImp(FunctionImp *f, const List *args)
{
KJSO aobj(new ArgumentsObject(f, args));
put("arguments", aobj, DontDelete);
/* TODO: this is here to get myFunc.arguments and myFunc.a1 going.
I can't see this described in the spec but it's possible in browsers. */
if (!f->name().isNull())
f->put("arguments", aobj);
}
ExecutionStack::ExecutionStack()
: progNode(0L), firstNode(0L), prev(0)
{
}
ExecutionStack* ExecutionStack::push()
{
ExecutionStack *s = new ExecutionStack();
s->prev = this;
return s;
}
ExecutionStack* ExecutionStack::pop()
{
ExecutionStack *s = prev;
delete this;
return s;
}
KJScriptImp* KJScriptImp::curr = 0L;
KJScriptImp* KJScriptImp::hook = 0L;
int KJScriptImp::instances = 0;
int KJScriptImp::running = 0;
KJScriptImp::KJScriptImp(KJScript *s)
: scr(s),
initialized(false),
glob(0L),
#ifdef KJS_DEBUGGER
dbg(0L),
#endif
retVal(0L)
{
instances++;
KJScriptImp::curr = this;
// are we the first interpreter instance ? Initialize some stuff
if (instances == 1)
globalInit();
stack = new ExecutionStack();
clearException();
lex = new Lexer();
}
KJScriptImp::~KJScriptImp()
{
KJScriptImp::curr = this;
#ifdef KJS_DEBUGGER
attachDebugger(0L);
#endif
clear();
delete lex;
lex = 0L;
delete stack;
stack = 0L;
KJScriptImp::curr = 0L;
// are we the last of our kind ? Free global stuff.
if (instances == 1)
globalClear();
instances--;
}
void KJScriptImp::globalInit()
{
UndefinedImp::staticUndefined = new UndefinedImp();
UndefinedImp::staticUndefined->ref();
NullImp::staticNull = new NullImp();
NullImp::staticNull->ref();
BooleanImp::staticTrue = new BooleanImp(true);
BooleanImp::staticTrue->ref();
BooleanImp::staticFalse = new BooleanImp(false);
BooleanImp::staticFalse->ref();
}
void KJScriptImp::globalClear()
{
UndefinedImp::staticUndefined->deref();
UndefinedImp::staticUndefined = 0L;
NullImp::staticNull->deref();
NullImp::staticNull = 0L;
BooleanImp::staticTrue->deref();
BooleanImp::staticTrue = 0L;
BooleanImp::staticFalse->deref();
BooleanImp::staticFalse = 0L;
}
void KJScriptImp::mark()
{
if (exVal && !exVal->marked())
exVal->mark();
if (retVal && !retVal->marked())
retVal->mark();
if (glob.imp())
glob.imp()->mark();
UndefinedImp::staticUndefined->mark();
NullImp::staticNull->mark();
BooleanImp::staticTrue->mark();
BooleanImp::staticFalse->mark();
}
void KJScriptImp::init()
{
KJScriptImp::curr = this;
clearException();
retVal = 0L;
if (!initialized) {
// add this interpreter to the global chain
// as a root set for garbage collection
if (hook) {
prev = hook;
next = hook->next;
hook->next->prev = this;
hook->next = this;
} else {
hook = next = prev = this;
}
glob.init();
con = new Context();
firstN = 0L;
progN = 0L;
recursion = 0;
errMsg = "";
initialized = true;
#ifdef KJS_DEBUGGER
sid = -1;
#endif
}
}
void KJScriptImp::clear()
{
if ( recursion ) {
#ifndef NDEBUG
fprintf(stderr, "KJS: ignoring clear() while running\n");
#endif
return;
}
KJScriptImp *old = curr;
if (initialized) {
KJScriptImp::curr = this;
Node::setFirstNode(firstNode());
Node::deleteAllNodes();
setFirstNode(0L);
setProgNode(0L);
clearException();
retVal = 0L;
delete con; con = 0L;
glob.clear();
Collector::collect();
// remove from global chain (see init())
next->prev = prev;
prev->next = next;
hook = next;
if (hook == this)
hook = 0L;
#ifdef KJS_DEBUGGER
sid = -1;
#endif
initialized = false;
}
if (old != this)
KJScriptImp::curr = old;
}
bool KJScriptImp::evaluate(const UChar *code, unsigned int length, const KJSO &thisV,
bool onlyCheckSyntax)
{
init();
#ifdef KJS_DEBUGGER
sid++;
if (debugger())
debugger()->setSourceId(sid);
#endif
if (recursion > 7) {
fprintf(stderr, "KJS: breaking out of recursion\n");
return true;
} else if (recursion > 0) {
#ifndef NDEBUG
fprintf(stderr, "KJS: entering recursion level %d\n", recursion);
#endif
pushStack();
}
assert(Lexer::curr());
Lexer::curr()->setCode(code, length);
Node::setFirstNode(firstNode());
int parseError = kjsyyparse();
setFirstNode(Node::firstNode());
if (parseError) {
errType = 99; /* TODO */
errLine = Lexer::curr()->lineNo();
errMsg = "Parse error at line " + UString::from(errLine);
#ifndef NDEBUG
fprintf(stderr, "JavaScript parse error at line %d.\n", errLine);
#endif
/* TODO: either clear everything or keep previously
parsed function definitions */
// Node::deleteAllNodes();
return false;
}
if (onlyCheckSyntax)
return true;
clearException();
KJSO oldVar;
if (!thisV.isNull()) {
context()->setThisValue(thisV);
context()->pushScope(thisV);
oldVar = context()->variableObject();
context()->setVariableObject(thisV);
}
running++;
recursion++;
assert(progNode());
Completion res = progNode()->execute();
recursion--;
running--;
if (hadException()) {
KJSO err = exception();
errType = 99; /* TODO */
errLine = err.get("line").toInt32();
errMsg = err.get("name").toString().value() + ". ";
errMsg += err.get("message").toString().value();
#ifdef KJS_DEBUGGER
if (dbg)
dbg->setSourceId(err.get("sid").toInt32());
#endif
clearException();
} else {
errType = 0;
errLine = -1;
errMsg = "";
// catch return value
retVal = 0L;
if (res.complType() == ReturnValue || !thisV.isNull())
retVal = res.value().imp();
}
if (!thisV.isNull()) {
context()->popScope();
context()->setVariableObject(oldVar);
}
if (progNode())
progNode()->deleteGlobalStatements();
if (recursion > 0) {
popStack();
}
return !errType;
}
void KJScriptImp::pushStack()
{
stack = stack->push();
}
void KJScriptImp::popStack()
{
stack = stack->pop();
assert(stack);
}
bool KJScriptImp::call(const KJSO &scope, const UString &func, const List &args)
{
init();
KJSO callScope(scope);
if (callScope.isNull())
callScope = Global::current().imp();
if (!callScope.hasProperty(func)) {
#ifndef NDEBUG
fprintf(stderr, "couldn't resolve function name %s. call() failed\n",
func.ascii());
#endif
return false;
}
KJSO v = callScope.get(func);
if (!v.isA(ConstructorType)) {
#ifndef NDEBUG
fprintf(stderr, "%s is not a function. call() failed.\n", func.ascii());
#endif
return false;
}
running++;
recursion++;
static_cast<ConstructorImp*>(v.imp())->executeCall(scope.imp(), &args);
recursion--;
running--;
return !hadException();
}
bool KJScriptImp::call(const KJSO &func, const KJSO &thisV,
const List &args, const List &extraScope)
{
init();
if(!func.implementsCall())
return false;
running++;
recursion++;
retVal = func.executeCall(thisV, &args, &extraScope).imp();
recursion--;
running--;
return !hadException();
}
void KJScriptImp::setException(Imp *e)
{
assert(curr);
curr->exVal = e;
curr->exMsg = "Exception"; // not very meaningful but we use !0L to test
}
void KJScriptImp::setException(const char *msg)
{
assert(curr);
curr->exVal = 0L; // will be created later on exception()
curr->exMsg = msg;
}
KJSO KJScriptImp::exception()
{
assert(curr);
if (!curr->exMsg)
return Undefined();
if (curr->exVal)
return curr->exVal;
return Error::create(GeneralError, curr->exMsg);
}
void KJScriptImp::clearException()
{
assert(curr);
curr->exMsg = 0L;
curr->exVal = 0L;
}
#ifdef KJS_DEBUGGER
void KJScriptImp::attachDebugger(Debugger *d)
{
static bool detaching = false;
if (detaching) // break circular detaching
return;
if (dbg) {
detaching = true;
dbg->detach();
detaching = false;
}
dbg = d;
}
bool KJScriptImp::setBreakpoint(int id, int line, bool set)
{
init();
return Node::setBreakpoint(firstNode(), id, line, set);
}
#endif
bool PropList::contains(const UString &name)
{
PropList *p = this;
while (p) {
if (name == p->name)
return true;
p = p->next;
}
return false;
}
bool LabelStack::push(const UString &id)
{
if (id.isEmpty() || contains(id))
return false;
StackElm *newtos = new StackElm;
newtos->id = id;
newtos->prev = tos;
tos = newtos;
return true;
}
bool LabelStack::contains(const UString &id) const
{
if (id.isEmpty())
return true;
for (StackElm *curr = tos; curr; curr = curr->prev)
if (curr->id == id)
return true;
return false;
}
void LabelStack::pop()
{
if (tos) {
StackElm *prev = tos->prev;
delete tos;
tos = prev;
}
}
LabelStack::~LabelStack()
{
StackElm *prev;
while (tos) {
prev = tos->prev;
delete tos;
tos = prev;
}
}
// ECMA 15.3.5.3 [[HasInstance]]
// see comment in header file
KJSO KJS::hasInstance(const KJSO &F, const KJSO &V)
{
if (V.isObject()) {
KJSO prot = F.get("prototype");
if (!prot.isObject())
return Error::create(TypeError, "Invalid prototype encountered "
"in instanceof operation.");
Imp *v = V.imp();
while ((v = v->prototype())) {
if (v == prot.imp())
return Boolean(true);
}
}
return Boolean(false);
}
#ifndef NDEBUG
#include <stdio.h>
void KJS::printInfo( const char *s, const KJSO &o )
{
if (o.isNull())
fprintf(stderr, "%s: (null)\n", s);
else {
KJSO v = o;
if (o.isA(ReferenceType))
v = o.getValue();
fprintf(stderr, "JS: %s: %s : %s (%p)\n",
s,
v.toString().value().ascii(),
v.imp()->typeInfo()->name,
(void*)v.imp());
if (o.isA(ReferenceType)) {
fprintf(stderr, "JS: Was property '%s'\n", o.getPropertyName().ascii());
printInfo("of", o.getBase());
}
}
}
#endif
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