scopechain.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 *  Copyright (C) 2003, 2006, 2008 Apple Inc.
 *
 *  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., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "ScopeChain.h"

#include "JSActivation.h"
#include "JSGlobalObject.h"
#include "JSObject.h"
#include "PropertyNameArray.h"
#include <stdio.h>

namespace JSC {

#ifndef NDEBUG

void ScopeChainNode::print() const
{
    ScopeChainIterator scopeEnd = end();
    for (ScopeChainIterator scopeIter = begin(); scopeIter != scopeEnd; ++scopeIter) {
        JSObject* o = *scopeIter;
        PropertyNameArray propertyNames(globalObject()->globalExec());
        o->getPropertyNames(globalObject()->globalExec(), propertyNames);
        PropertyNameArray::const_iterator propEnd = propertyNames.end();

        fprintf(stderr, "----- [scope %p] -----\n", o);
        for (PropertyNameArray::const_iterator propIter = propertyNames.begin(); propIter != propEnd; propIter++) {
            Identifier name = *propIter;
            fprintf(stderr, "%s, ", name.ascii());
        }
        fprintf(stderr, "\n");
    }
}

#endif

int ScopeChain::localDepth() const
{
    int scopeDepth = 0;
    ScopeChainIterator iter = this->begin();
    ScopeChainIterator end = this->end();
    while (!(*iter)->isObject(&JSActivation::info)) {
        ++iter;
        if (iter == end)
            break;
        ++scopeDepth;
    }
    return scopeDepth;
}

} // namespace JSC