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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the V4VM module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qv4syntaxchecker_p.h"
using namespace QQmlJS;
SyntaxChecker::SyntaxChecker()
: Lexer(&m_engine)
, m_stateStack(128)
{
}
void QQmlJS::SyntaxChecker::clearText()
{
m_code.clear();
m_tokens.clear();
}
void SyntaxChecker::appendText(const QString &text)
{
m_code += text;
}
QString SyntaxChecker::text() const
{
return m_code;
}
bool SyntaxChecker::canEvaluate()
{
int yyaction = 0;
int yytoken = -1;
int yytos = -1;
setCode(m_code, 1);
m_tokens.clear();
m_tokens.append(T_FEED_JS_PROGRAM);
do {
if (++yytos == m_stateStack.size())
m_stateStack.resize(m_stateStack.size() * 2);
m_stateStack[yytos] = yyaction;
again:
if (yytoken == -1 && action_index[yyaction] != -TERMINAL_COUNT) {
if (m_tokens.isEmpty())
yytoken = lex();
else
yytoken = m_tokens.takeFirst();
}
yyaction = t_action(yyaction, yytoken);
if (yyaction > 0) {
if (yyaction == ACCEPT_STATE) {
--yytos;
return true;
}
yytoken = -1;
} else if (yyaction < 0) {
const int ruleno = -yyaction - 1;
yytos -= rhs[ruleno];
yyaction = nt_action(m_stateStack[yytos], lhs[ruleno] - TERMINAL_COUNT);
}
} while (yyaction);
const int errorState = m_stateStack[yytos];
if (t_action(errorState, T_AUTOMATIC_SEMICOLON) && canInsertAutomaticSemicolon(yytoken)) {
yyaction = errorState;
m_tokens.prepend(yytoken);
yytoken = T_SEMICOLON;
goto again;
}
if (yytoken != EOF_SYMBOL)
return true;
return false;
}
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