source: trunk/src/script/parser/qscriptlexer_p.h@ 792

/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtScript module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL-ONLY$
** GNU Lesser General Public License Usage
** 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.
**
** If you have questions regarding the use of this file, please contact
** Nokia at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QSCRIPTLEXER_P_H
#define QSCRIPTLEXER_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/QString>

QT_BEGIN_NAMESPACE

class QScriptEnginePrivate;
class QScriptNameIdImpl;

namespace QScript {

class Lexer
{
public:
    Lexer(QScriptEnginePrivate *eng);
    ~Lexer();

    void setCode(const QString &c, int lineno);
    int lex();

    int currentLineNo() const { return yylineno; }
    int currentColumnNo() const { return yycolumn; }

    int startLineNo() const { return startlineno; }
    int startColumnNo() const { return startcolumn; }

    int endLineNo() const { return currentLineNo(); }
    int endColumnNo() const
    { int col = currentColumnNo(); return (col > 0) ? col - 1 : col; }

    bool prevTerminator() const { return terminator; }

    enum State { Start,
                 Identifier,
                 InIdentifier,
                 InSingleLineComment,
                 InMultiLineComment,
                 InNum,
                 InNum0,
                 InHex,
                 InOctal,
                 InDecimal,
                 InExponentIndicator,
                 InExponent,
                 Hex,
                 Octal,
                 Number,
                 String,
                 Eof,
                 InString,
                 InEscapeSequence,
                 InHexEscape,
                 InUnicodeEscape,
                 Other,
                 Bad };

    enum Error {
        NoError,
        IllegalCharacter,
        UnclosedStringLiteral,
        IllegalEscapeSequence,
        IllegalUnicodeEscapeSequence,
        UnclosedComment,
        IllegalExponentIndicator,
        IllegalIdentifier
    };

    enum ParenthesesState {
        IgnoreParentheses,
        CountParentheses,
        BalancedParentheses
    };

    enum RegExpBodyPrefix {
        NoPrefix,
        EqualPrefix
    };

    bool scanRegExp(RegExpBodyPrefix prefix = NoPrefix);

    QScriptNameIdImpl *pattern;
    int flags;

    State lexerState() const
        { return state; }

    QString errorMessage() const
        { return errmsg; }
    void setErrorMessage(const QString &err)
        { errmsg = err; }
    void setErrorMessage(const char *err)
        { setErrorMessage(QString::fromLatin1(err)); }

    Error error() const
        { return err; }
    void clearError()