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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the tools applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef TOKENIZER_H
#define TOKENIZER_H
#include "location.h"
#include <QtCore/qfile.h>
#include <QtCore/qstack.h>
#include <QtCore/qstring.h>
QT_BEGIN_NAMESPACE
/*
Here come the C++ tokens we support. The first part contains
all-purpose tokens; then come keywords.
If you add a keyword, make sure to modify the keyword array in
tokenizer.cpp as well, and possibly adjust Tok_FirstKeyword and
Tok_LastKeyword.
*/
enum {
Tok_Eoi,
Tok_Ampersand,
Tok_Aster,
Tok_Caret,
Tok_LeftParen,
Tok_RightParen,
Tok_LeftParenAster,
Tok_Equal,
Tok_LeftBrace,
Tok_RightBrace,
Tok_Semicolon,
Tok_Colon,
Tok_LeftAngle,
Tok_RightAngle,
Tok_Comma,
Tok_Ellipsis,
Tok_Gulbrandsen,
Tok_LeftBracket,
Tok_RightBracket,
Tok_Tilde,
Tok_SomeOperator,
Tok_Number,
Tok_String,
Tok_Doc,
Tok_Comment,
Tok_Ident,
Tok_At,
Tok_char,
Tok_class,
Tok_const,
Tok_double,
Tok_int,
Tok_long,
Tok_operator,
Tok_short,
Tok_signed,
Tok_typename,
Tok_unsigned,
Tok_void,
Tok_volatile,
Tok_int64,
Tok_QPrivateSignal,
Tok_FirstKeyword = Tok_char,
Tok_LastKeyword = Tok_QPrivateSignal
};
/*
The Tokenizer class implements lexical analysis of C++ source
files.
Not every operator or keyword of C++ is recognized; only those
that are interesting to us. Some Qt keywords or macros are also
recognized.
*/
class Tokenizer
{
public:
Tokenizer(const Location &loc, QByteArray in);
Tokenizer(const Location &loc, QFile &file);
~Tokenizer();
int getToken();
void setParsingFnOrMacro(bool macro) { m_parsingMacro = macro; }
[[nodiscard]] const Location &location() const { return m_tokLoc; }
[[nodiscard]] QString previousLexeme() const;
[[nodiscard]] QString lexeme() const;
[[nodiscard]] QString version() const { return m_version; }
[[nodiscard]] int parenDepth() const { return m_parenDepth; }
[[nodiscard]] int bracketDepth() const { return m_bracketDepth; }
static void initialize();
static void terminate();
static bool isTrue(const QString &condition);
private:
void init();
void start(const Location &loc);
/*
Represents the maximum amount of characters that can appear in a
block-comment.
When a block-comment with more characters than the maximum amount is
encountered, a warning is issued.
*/
enum { yyLexBufSize = 524288 };
int getch() { return m_pos == m_in.size() ? EOF : m_in[m_pos++]; }
inline int getChar()
{
if (m_ch == EOF)
return EOF;
if (m_lexLen < yyLexBufSize - 1) {
m_lex[m_lexLen++] = (char)m_ch;
m_lex[m_lexLen] = '\0';
} else if (!token_too_long_warning_was_issued) {
location().warning(
u"The content is too long.\n"_qs,
u"The maximum amount of characters for this content is %1.\n"_qs.arg(yyLexBufSize) +
"Consider splitting it or reducing its size."
);
token_too_long_warning_was_issued = true;
}
m_curLoc.advance(QChar(m_ch));
int ch = getch();
if (ch == EOF)
return EOF;
// cast explicitly to make sure the value of ch
// is in range [0..255] to avoid assert messages
// when using debug CRT that checks its input.
return int(uint(uchar(ch)));
}
int getTokenAfterPreprocessor();
void pushSkipping(bool skip);
bool popSkipping();
Location m_tokLoc;
Location m_curLoc;
char *m_lexBuf1 { nullptr };
char *m_lexBuf2 { nullptr };
char *m_prevLex { nullptr };
char *m_lex { nullptr };
size_t m_lexLen {};
QStack<bool> m_preprocessorSkipping;
int m_numPreprocessorSkipping {};
int m_braceDepth {};
int m_parenDepth {};
int m_bracketDepth {};
int m_ch {};
QString m_version {};
bool m_parsingMacro {};
// Used to ensure that the warning that is issued when a token is
// too long to fit into our fixed sized buffer is not repeated for each
// character of that token after the last saved one.
// The flag is reset whenever a new token is requested, so as to allow
// reporting all such tokens that are too long during a single execution.
bool token_too_long_warning_was_issued{false};
protected:
QByteArray m_in {};
int m_pos {};
};
QT_END_NAMESPACE
#endif
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