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qt-creator/src/libs/3rdparty/cplusplus/Lexer.cpp
Leandro Melo e148d030f5 C++: Introduce C++11 raw string literals 
Although they are now supported by the lexer
and parser, it is worth to remind that we still
need to address an issue concerning the highlight
of multiline literals (which with the advent of
the new raw strings will become more common).

Task-number: QTCREATORBUG-6722
Change-Id: I137337a9ac0152a1f8b9faded0b960c6fe3dd38a
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>
2012-08-23 14:35:02 +02:00

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// Copyright (c) 2008 Roberto Raggi <roberto.raggi@gmail.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include "Lexer.h"
#include "Control.h"
#include "TranslationUnit.h"
#include "Literals.h"
#include <cctype>
#include <cassert>
using namespace CPlusPlus;
Lexer::Lexer(TranslationUnit *unit)
: _translationUnit(unit),
_state(State_Default),
_flags(0),
_currentLine(1)
{
f._scanKeywords = true;
setSource(_translationUnit->firstSourceChar(),
_translationUnit->lastSourceChar());
}
Lexer::Lexer(const char *firstChar, const char *lastChar)
: _translationUnit(0),
_state(State_Default),
_flags(0),
_currentLine(1)
{
f._scanKeywords = true;
setSource(firstChar, lastChar);
}
Lexer::~Lexer()
{ }
TranslationUnit *Lexer::translationUnit() const
{ return _translationUnit; }
Control *Lexer::control() const
{
if (_translationUnit)
return _translationUnit->control();
return 0;
}
void Lexer::setSource(const char *firstChar, const char *lastChar)
{
_firstChar = firstChar;
_lastChar = lastChar;
_currentChar = _firstChar - 1;
_tokenStart = _currentChar;
_yychar = '\n';
}
void Lexer::setStartWithNewline(bool enabled)
{
if (enabled)
_yychar = '\n';
else
_yychar = ' ';
}
int Lexer::state() const
{ return _state; }
void Lexer::setState(int state)
{ _state = state; }
bool Lexer::qtMocRunEnabled() const
{ return f._qtMocRunEnabled; }
void Lexer::setQtMocRunEnabled(bool onoff)
{ f._qtMocRunEnabled = onoff; }
bool Lexer::cxx0xEnabled() const
{ return f._cxx0xEnabled; }
void Lexer::setCxxOxEnabled(bool onoff)
{ f._cxx0xEnabled = onoff; }
bool Lexer::objCEnabled() const
{ return f._objCEnabled; }
void Lexer::setObjCEnabled(bool onoff)
{ f._objCEnabled = onoff; }
bool Lexer::isIncremental() const
{ return f._isIncremental; }
void Lexer::setIncremental(bool isIncremental)
{ f._isIncremental = isIncremental; }
bool Lexer::scanCommentTokens() const
{ return f._scanCommentTokens; }
void Lexer::setScanCommentTokens(bool onoff)
{ f._scanCommentTokens = onoff; }
bool Lexer::scanKeywords() const
{ return f._scanKeywords; }
void Lexer::setScanKeywords(bool onoff)
{ f._scanKeywords = onoff; }
void Lexer::setScanAngleStringLiteralTokens(bool onoff)
{ f._scanAngleStringLiteralTokens = onoff; }
void Lexer::pushLineStartOffset()
{
++_currentLine;
if (_translationUnit)
_translationUnit->pushLineOffset(_currentChar - _firstChar);
}
unsigned Lexer::tokenOffset() const
{ return _tokenStart - _firstChar; }
unsigned Lexer::tokenLength() const
{ return _currentChar - _tokenStart; }
const char *Lexer::tokenBegin() const
{ return _tokenStart; }
const char *Lexer::tokenEnd() const
{ return _currentChar; }
unsigned Lexer::currentLine() const
{ return _currentLine; }
void Lexer::scan(Token *tok)
{
tok->reset();
scan_helper(tok);
tok->f.length = _currentChar - _tokenStart;
}
void Lexer::scan_helper(Token *tok)
{
_Lagain:
while (_yychar && std::isspace(_yychar)) {
if (_yychar == '\n') {
tok->f.joined = false;
tok->f.newline = true;
} else {
tok->f.whitespace = true;
}
yyinp();
}
if (! _translationUnit)
tok->lineno = _currentLine;
_tokenStart = _currentChar;
tok->offset = _currentChar - _firstChar;
if (_state == State_MultiLineComment || _state == State_MultiLineDoxyComment) {
const int originalState = _state;
if (! _yychar) {
tok->f.kind = T_EOF_SYMBOL;
return;
}
while (_yychar) {
if (_yychar != '*')
yyinp();
else {
yyinp();
if (_yychar == '/') {
yyinp();
_state = State_Default;
break;
}
}
}
if (! f._scanCommentTokens)
goto _Lagain;
else if (originalState == State_MultiLineComment)
tok->f.kind = T_COMMENT;
else
tok->f.kind = T_DOXY_COMMENT;
return; // done
}
if (! _yychar) {
tok->f.kind = T_EOF_SYMBOL;
return;
}
unsigned char ch = _yychar;
yyinp();
switch (ch) {
case '\\':
while (_yychar != '\n' && std::isspace(_yychar))
yyinp();
// ### assert(! _yychar || _yychar == '\n');
if (_yychar == '\n') {
tok->f.joined = true;
tok->f.newline = false;
yyinp();
}
goto _Lagain;
case '"':
scanStringLiteral(tok);
break;
case '\'':
scanCharLiteral(tok);
break;
case '{':
tok->f.kind = T_LBRACE;
break;
case '}':
tok->f.kind = T_RBRACE;
break;
case '[':
tok->f.kind = T_LBRACKET;
break;
case ']':
tok->f.kind = T_RBRACKET;
break;
case '#':
if (_yychar == '#') {
tok->f.kind = T_POUND_POUND;
yyinp();
} else {
tok->f.kind = T_POUND;
}
break;
case '(':
tok->f.kind = T_LPAREN;
break;
case ')':
tok->f.kind = T_RPAREN;
break;
case ';':
tok->f.kind = T_SEMICOLON;
break;
case ':':
if (_yychar == ':') {
yyinp();
tok->f.kind = T_COLON_COLON;
} else {
tok->f.kind = T_COLON;
}
break;
case '.':
if (_yychar == '*') {
yyinp();
tok->f.kind = T_DOT_STAR;
} else if (_yychar == '.') {
yyinp();
// ### assert(_yychar);
if (_yychar == '.') {
yyinp();
tok->f.kind = T_DOT_DOT_DOT;
} else {
tok->f.kind = T_ERROR;
}
} else if (std::isdigit(_yychar)) {
const char *yytext = _currentChar - 2;
do {
if (_yychar == 'e' || _yychar == 'E') {
yyinp();
if (_yychar == '-' || _yychar == '+') {
yyinp();
// ### assert(std::isdigit(_yychar));
}
} else if (std::isalnum(_yychar) || _yychar == '.') {
yyinp();
} else {
break;
}
} while (_yychar);
int yylen = _currentChar - yytext;
tok->f.kind = T_NUMERIC_LITERAL;
if (control())
tok->number = control()->numericLiteral(yytext, yylen);
} else {
tok->f.kind = T_DOT;
}
break;
case '?':
tok->f.kind = T_QUESTION;
break;
case '+':
if (_yychar == '+') {
yyinp();
tok->f.kind = T_PLUS_PLUS;
} else if (_yychar == '=') {
yyinp();
tok->f.kind = T_PLUS_EQUAL;
} else {
tok->f.kind = T_PLUS;
}
break;
case '-':
if (_yychar == '-') {
yyinp();
tok->f.kind = T_MINUS_MINUS;
} else if (_yychar == '=') {
yyinp();
tok->f.kind = T_MINUS_EQUAL;
} else if (_yychar == '>') {
yyinp();
if (_yychar == '*') {
yyinp();
tok->f.kind = T_ARROW_STAR;
} else {
tok->f.kind = T_ARROW;
}
} else {
tok->f.kind = T_MINUS;
}
break;
case '*':
if (_yychar == '=') {
yyinp();
tok->f.kind = T_STAR_EQUAL;
} else {
tok->f.kind = T_STAR;
}
break;
case '/':
if (_yychar == '/') {
yyinp();
bool doxy = false;
if (_yychar == '/' || _yychar == '!') {
yyinp();
if (_yychar == '<')
yyinp();
if (_yychar != '\n' && std::isspace(_yychar))
doxy = true;
}
while (_yychar && _yychar != '\n')
yyinp();
if (! f._scanCommentTokens)
goto _Lagain;
tok->f.kind = doxy ? T_CPP_DOXY_COMMENT : T_CPP_COMMENT;
} else if (_yychar == '*') {
yyinp();
bool doxy = false;
if (_yychar == '*' || _yychar == '!') {
const char ch = _yychar;
yyinp();
if (ch == '*' && _yychar == '/')
goto _Ldone;
if (_yychar == '<')
yyinp();
if (! _yychar || std::isspace(_yychar))
doxy = true;
}
while (_yychar) {
if (_yychar != '*') {
yyinp();
} else {
yyinp();
if (_yychar == '/')
break;
}
}
_Ldone:
if (_yychar)
yyinp();
else
_state = doxy ? State_MultiLineDoxyComment : State_MultiLineComment;
if (! f._scanCommentTokens)
goto _Lagain;
tok->f.kind = doxy ? T_DOXY_COMMENT : T_COMMENT;
} else if (_yychar == '=') {
yyinp();
tok->f.kind = T_SLASH_EQUAL;
} else {
tok->f.kind = T_SLASH;
}
break;
case '%':
if (_yychar == '=') {
yyinp();
tok->f.kind = T_PERCENT_EQUAL;
} else {
tok->f.kind = T_PERCENT;
}
break;
case '^':
if (_yychar == '=') {
yyinp();
tok->f.kind = T_CARET_EQUAL;
} else {
tok->f.kind = T_CARET;
}
break;
case '&':
if (_yychar == '&') {
yyinp();
tok->f.kind = T_AMPER_AMPER;
} else if (_yychar == '=') {
yyinp();
tok->f.kind = T_AMPER_EQUAL;
} else {
tok->f.kind = T_AMPER;
}
break;
case '|':
if (_yychar == '|') {
yyinp();
tok->f.kind = T_PIPE_PIPE;
} else if (_yychar == '=') {
yyinp();
tok->f.kind = T_PIPE_EQUAL;
} else {
tok->f.kind = T_PIPE;
}
break;
case '~':
if (_yychar == '=') {
yyinp();
tok->f.kind = T_TILDE_EQUAL;
} else {
tok->f.kind = T_TILDE;
}
break;
case '!':
if (_yychar == '=') {
yyinp();
tok->f.kind = T_EXCLAIM_EQUAL;
} else {
tok->f.kind = T_EXCLAIM;
}
break;
case '=':
if (_yychar == '=') {
yyinp();
tok->f.kind = T_EQUAL_EQUAL;
} else {
tok->f.kind = T_EQUAL;
}
break;
case '<':
if (f._scanAngleStringLiteralTokens) {
const char *yytext = _currentChar;
while (_yychar && _yychar != '>')
yyinp();
int yylen = _currentChar - yytext;
// ### assert(_yychar == '>');
if (_yychar == '>')
yyinp();
if (control())
tok->string = control()->stringLiteral(yytext, yylen);
tok->f.kind = T_ANGLE_STRING_LITERAL;
} else if (_yychar == '<') {
yyinp();
if (_yychar == '=') {
yyinp();
tok->f.kind = T_LESS_LESS_EQUAL;
} else
tok->f.kind = T_LESS_LESS;
} else if (_yychar == '=') {
yyinp();
tok->f.kind = T_LESS_EQUAL;
} else {
tok->f.kind = T_LESS;
}
break;
case '>':
if (_yychar == '>') {
yyinp();
if (_yychar == '=') {
yyinp();
tok->f.kind = T_GREATER_GREATER_EQUAL;
} else
tok->f.kind = T_LESS_LESS;
tok->f.kind = T_GREATER_GREATER;
} else if (_yychar == '=') {
yyinp();
tok->f.kind = T_GREATER_EQUAL;
} else {
tok->f.kind = T_GREATER;
}
break;
case ',':
tok->f.kind = T_COMMA;
break;
default: {
if (f._objCEnabled) {
if (ch == '@' && _yychar >= 'a' && _yychar <= 'z') {
const char *yytext = _currentChar;
do {
yyinp();
if (! (isalnum(_yychar) || _yychar == '_' || _yychar == '$'))
break;
} while (_yychar);
const int yylen = _currentChar - yytext;
tok->f.kind = classifyObjCAtKeyword(yytext, yylen);
break;
} else if (ch == '@' && _yychar == '"') {
yyinp();
scanStringLiteral(tok, '"');
break;
}
}
if (ch == 'L' || ch == 'u' || ch == 'U' || ch == 'R') {
// Either a literal or still an identifier.
if (_yychar == '"') {
yyinp();
if (ch == 'R')
scanRawStringLiteral(tok);
else
scanStringLiteral(tok, ch);
} else if (_yychar == '\'') {
yyinp();
scanCharLiteral(tok, ch);
} else if (ch != 'R' && _yychar == 'R') {
yyinp();
if (_yychar == '"') {
yyinp();
scanRawStringLiteral(tok, ch);
} else {
scanIdentifier(tok, 1);
}
} else if (ch == 'u' && _yychar == '8') {
yyinp();
if (_yychar == '"') {
yyinp();
scanStringLiteral(tok, '8');
} else if (_yychar == '\'') {
yyinp();
scanCharLiteral(tok, '8');
} else if (_yychar == 'R') {
yyinp();
if (_yychar == '"') {
yyinp();
scanRawStringLiteral(tok, '8');
} else {
scanIdentifier(tok, 2);
}
} else {
scanIdentifier(tok, 1);
}
} else {
scanIdentifier(tok);
}
} else if (std::isalpha(ch) || ch == '_' || ch == '$') {
scanIdentifier(tok);
} else if (std::isdigit(ch)) {
scanNumericLiteral(tok);
} else {
tok->f.kind = T_ERROR;
}
break;
} // default
} // switch
}
void Lexer::scanStringLiteral(Token *tok, unsigned char hint)
{
scanUntilQuote(tok, '"');
if (hint == 'L')
tok->f.kind = T_WIDE_STRING_LITERAL;
else if (hint == 'U')
tok->f.kind = T_UTF32_STRING_LITERAL;
else if (hint == 'u')
tok->f.kind = T_UTF16_STRING_LITERAL;
else if (hint == '8')
tok->f.kind = T_UTF8_STRING_LITERAL;
else if (hint == '@')
tok->f.kind = T_AT_STRING_LITERAL;
else
tok->f.kind = T_STRING_LITERAL;
}
void Lexer::scanRawStringLiteral(Token *tok, unsigned char hint)
{
const char *yytext = _currentChar;
int delimLength = -1;
const char *closingDelimCandidate = 0;
while (_yychar) {
if (_yychar == '(' && delimLength == -1) {
delimLength = _currentChar - yytext;
yyinp();
} else if (_yychar == ')') {
yyinp();
if (delimLength == -1)
break;
closingDelimCandidate = _currentChar;
} else {
if (delimLength == -1) {
if (_yychar == '\\' || std::isspace(_yychar))
break;
yyinp();
} else {
if (!closingDelimCandidate) {
yyinp();
} else {
if (_yychar == '"') {
if (delimLength == _currentChar - closingDelimCandidate) {
// Got a matching closing delimiter.
break;
}
}
// Make sure this continues to be a valid candidate.
if (_yychar != *(yytext + (_currentChar - closingDelimCandidate)))
closingDelimCandidate = 0;
yyinp();
}
}
}
}
int yylen = _currentChar - yytext;
if (_yychar == '"')
yyinp();
if (control())
tok->string = control()->stringLiteral(yytext, yylen);
if (hint == 'L')
tok->f.kind = T_RAW_WIDE_STRING_LITERAL;
else if (hint == 'U')
tok->f.kind = T_RAW_UTF32_STRING_LITERAL;
else if (hint == 'u')
tok->f.kind = T_RAW_UTF16_STRING_LITERAL;
else if (hint == '8')
tok->f.kind = T_RAW_UTF8_STRING_LITERAL;
else
tok->f.kind = T_RAW_STRING_LITERAL;
}
void Lexer::scanCharLiteral(Token *tok, unsigned char hint)
{
scanUntilQuote(tok, '\'');
if (hint == 'L')
tok->f.kind = T_WIDE_CHAR_LITERAL;
else if (hint == 'U')
tok->f.kind = T_UTF32_CHAR_LITERAL;
else if (hint == 'u')
tok->f.kind = T_UTF16_CHAR_LITERAL;
else
tok->f.kind = T_CHAR_LITERAL;
}
void Lexer::scanUntilQuote(Token *tok, unsigned char quote)
{
assert(quote == '"' || quote == '\'');
const char *yytext = _currentChar;
while (_yychar
&& _yychar != quote
&& _yychar != '\n') {
if (_yychar != '\\')
yyinp();
else {
yyinp(); // skip `\\'
if (_yychar)
yyinp();
}
}
int yylen = _currentChar - yytext;
if (_yychar == quote)
yyinp();
if (control())
tok->string = control()->stringLiteral(yytext, yylen);
}
void Lexer::scanNumericLiteral(Token *tok)
{
const char *yytext = _currentChar - 1;
while (_yychar) {
if (_yychar == 'e' || _yychar == 'E') {
yyinp();
if (_yychar == '-' || _yychar == '+') {
yyinp();
// ### assert(std::isdigit(_yychar));
}
} else if (std::isalnum(_yychar) || _yychar == '.') {
yyinp();
} else {
break;
}
}
int yylen = _currentChar - yytext;
tok->f.kind = T_NUMERIC_LITERAL;
if (control())
tok->number = control()->numericLiteral(yytext, yylen);
}
void Lexer::scanIdentifier(Token *tok, unsigned extraProcessedChars)
{
const char *yytext = _currentChar - 1 - extraProcessedChars;
while (std::isalnum(_yychar) || _yychar == '_' || _yychar == '$')
yyinp();
int yylen = _currentChar - yytext;
if (f._scanKeywords)
tok->f.kind = classify(yytext, yylen, f._qtMocRunEnabled, f._cxx0xEnabled);
else
tok->f.kind = T_IDENTIFIER;
if (tok->f.kind == T_IDENTIFIER) {
tok->f.kind = classifyOperator(yytext, yylen);
if (control())
tok->identifier = control()->identifier(yytext, yylen);
}
}
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