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2041 lines (1837 loc) · 46.6 KB
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/****************************************************************************
**
** Copyright (C) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the Qt Script Generator project on Qt Labs.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "lexer.h"
#include "tokens.h"
#include "control.h"
#include <cctype>
#include <iostream>
scan_fun_ptr Lexer::s_scan_keyword_table[] = {
&Lexer::scanKeyword0, &Lexer::scanKeyword0,
&Lexer::scanKeyword2, &Lexer::scanKeyword3,
&Lexer::scanKeyword4, &Lexer::scanKeyword5,
&Lexer::scanKeyword6, &Lexer::scanKeyword7,
&Lexer::scanKeyword8, &Lexer::scanKeyword9,
&Lexer::scanKeyword10, &Lexer::scanKeyword11,
&Lexer::scanKeyword12, &Lexer::scanKeyword13,
&Lexer::scanKeyword14, &Lexer::scanKeyword0,
&Lexer::scanKeyword16
};
void LocationManager::extract_line(int offset, int *line, QString *filename) const
{
*line = 0;
if (token_stream.size () < 1)
return;
const unsigned char *begin_buffer = reinterpret_cast<const unsigned char *>(token_stream[0].text);
const unsigned char *cursor = begin_buffer + offset;
++cursor; // skip '#'
if (std::isspace(*cursor) && std::isdigit(*(cursor + 1)))
{
++cursor;
char buffer[1024], *cp = buffer;
do {
*cp++ = *cursor++;
} while (std::isdigit(*cursor));
*cp = '\0';
int l = strtol(buffer, 0, 0);
Q_ASSERT(std::isspace(*cursor));
++cursor;
Q_ASSERT(*cursor == '"');
++cursor;
cp = buffer;
while (*cursor && *cursor != '"') {
*cp++ = *cursor++;
}
*cp = '\0';
Q_ASSERT(*cursor == '"');
++cursor;
*filename = buffer;
*line = l;
// printf("filename: %s line: %d\n", buffer, line);
}
}
void LocationManager::positionAt(std::size_t offset, int *line, int *column,
QString *filename) const
{
int ppline, ppcolumn;
line_table.positionAt(offset, &ppline, &ppcolumn);
int base_line;
extract_line((int) line_table[ppline-1], &base_line, filename);
int line2, column2;
location_table.positionAt((int) line_table[ppline-1], &line2, &column2);
location_table.positionAt(offset, line, column);
*line = base_line + *line - line2 - 1;
}
scan_fun_ptr Lexer::s_scan_table[256];
bool Lexer::s_initialized = false;
void Lexer::tokenize(const char *contents, std::size_t size)
{
if (!s_initialized)
initialize_scan_table();
token_stream.resize(1024);
token_stream[0].kind = Token_EOF;
token_stream[0].text = contents;
index = 1;
cursor = (const unsigned char *) contents;
begin_buffer = (const unsigned char *) contents;
end_buffer = cursor + size;
location_table.resize(1024);
location_table[0] = 0;
location_table.current_line = 1;
line_table.resize(1024);
line_table[0] = 0;
line_table.current_line = 1;
do {
if (index >= token_stream.size()-4) // increase size of token_stream early, in case more than one token is written in one go
token_stream.resize(token_stream.size() * 2);
Token *current_token = &token_stream[(int) index];
current_token->text = reinterpret_cast<const char*>(begin_buffer);
current_token->position = cursor - begin_buffer;
(this->*s_scan_table[*cursor])();
current_token->size = cursor - begin_buffer - current_token->position;
} while (cursor < end_buffer);
if (index == token_stream.size())
token_stream.resize(token_stream.size() * 2);
Q_ASSERT(index < token_stream.size());
token_stream[(int) index].position = cursor - begin_buffer;
token_stream[(int) index].kind = Token_EOF;
}
void Lexer::reportError(const QString& msg)
{
int line, column;
QString fileName;
std::size_t tok = token_stream.cursor();
_M_location.positionAt(token_stream.position(tok),
&line, &column, &fileName);
Control::ErrorMessage errmsg;
errmsg.setLine(line + 1);
errmsg.setColumn(column);
errmsg.setFileName(fileName);
errmsg.setMessage(QLatin1String("** LEXER ERROR ") + msg);
control->reportError(errmsg);
}
void Lexer::initialize_scan_table()
{
s_initialized = true;
for (int i=0; i<256; ++i)
{
if (isspace(i))
s_scan_table[i] = &Lexer::scan_white_spaces;
else if (isalpha(i) || i == '_')
s_scan_table[i] = &Lexer::scan_identifier_or_keyword;
else if (isdigit(i))
s_scan_table[i] = &Lexer::scan_int_constant;
else
s_scan_table[i] = &Lexer::scan_invalid_input;
}
s_scan_table[int('L')] = &Lexer::scan_identifier_or_literal;
s_scan_table[int('\n')] = &Lexer::scan_newline;
s_scan_table[int('#')] = &Lexer::scan_preprocessor;
s_scan_table[int('\'')] = &Lexer::scan_char_constant;
s_scan_table[int('"')] = &Lexer::scan_string_constant;
s_scan_table[int('.')] = &Lexer::scan_int_constant;
s_scan_table[int('!')] = &Lexer::scan_not;
s_scan_table[int('%')] = &Lexer::scan_remainder;
s_scan_table[int('&')] = &Lexer::scan_and;
s_scan_table[int('(')] = &Lexer::scan_left_paren;
s_scan_table[int(')')] = &Lexer::scan_right_paren;
s_scan_table[int('*')] = &Lexer::scan_star;
s_scan_table[int('+')] = &Lexer::scan_plus;
s_scan_table[int(',')] = &Lexer::scan_comma;
s_scan_table[int('-')] = &Lexer::scan_minus;
s_scan_table[int('/')] = &Lexer::scan_divide;
s_scan_table[int(':')] = &Lexer::scan_colon;
s_scan_table[int(';')] = &Lexer::scan_semicolon;
s_scan_table[int('<')] = &Lexer::scan_less;
s_scan_table[int('=')] = &Lexer::scan_equal;
s_scan_table[int('>')] = &Lexer::scan_greater;
s_scan_table[int('?')] = &Lexer::scan_question;
s_scan_table[int('[')] = &Lexer::scan_left_bracket;
s_scan_table[int(']')] = &Lexer::scan_right_bracket;
s_scan_table[int('^')] = &Lexer::scan_xor;
s_scan_table[int('{')] = &Lexer::scan_left_brace;
s_scan_table[int('|')] = &Lexer::scan_or;
s_scan_table[int('}')] = &Lexer::scan_right_brace;
s_scan_table[int('~')] = &Lexer::scan_tilde;
s_scan_table[0] = &Lexer::scan_EOF;
}
void Lexer::scan_preprocessor()
{
if (line_table.current_line == line_table.size())
line_table.resize(line_table.current_line * 2);
line_table[(int) line_table.current_line++] = (cursor - begin_buffer);
while (*cursor && *cursor != '\n')
++cursor;
if (*cursor != '\n')
reportError("expected newline");
}
void Lexer::scan_char_constant_with_prefix(const unsigned char* prefix)
{
const unsigned char *begin = prefix ? prefix : cursor;
++cursor;
while (*cursor && *cursor != '\'')
{
if (*cursor == '\n')
reportError("did not expect newline");
if (*cursor == '\\')
++cursor;
++cursor;
}
if (*cursor != '\'')
reportError("expected \'");
++cursor;
token_stream[(int) index].extra.symbol =
control->findOrInsertName((const char*) begin, cursor - begin);
token_stream[(int) index++].kind = Token_char_literal;
}
void Lexer::scan_string_constant_with_prefix(const unsigned char* prefix)
{
const unsigned char *begin = prefix ? prefix : cursor;
++cursor;
while (*cursor && *cursor != '"')
{
if (*cursor == '\n')
reportError("did not expect newline");
if (*cursor == '\\')
++cursor;
++cursor;
}
if (*cursor != '"')
reportError("expected \"");
++cursor;
token_stream[(int) index].extra.symbol =
control->findOrInsertName((const char*) begin, cursor - begin);
token_stream[(int) index++].kind = Token_string_literal;
}
void Lexer::scan_raw_string_constant_with_prefix(const unsigned char* prefix)
{
// always starts with "
const unsigned char* begin = prefix ? prefix : cursor;
int delimiterLength = 0;
int endSequenceLength = 0;
bool stillValidDelimiter = true;
++cursor;
while (*cursor)
{
if (!delimiterLength)
{
if (*cursor == '"')
{
break;
}
else if (*cursor == '\n')
{
// this would probably not be a valid delimiter
stillValidDelimiter = false;
}
else if (stillValidDelimiter && *cursor == '(' && (cursor - begin) < 16)
{
// delimiter sequence identified (see https://en.cppreference.com/w/cpp/language/string_literal)
delimiterLength = cursor - begin;
}
}
else if (endSequenceLength)
{
// possible end delimiter sequence
if (endSequenceLength == delimiterLength && *cursor == '"')
{
break;
}
else if (endSequenceLength < delimiterLength && *cursor == begin[endSequenceLength])
{
endSequenceLength++;
}
else
{
// this is not the end of the string, go back to
// after the starting ')' and try again
cursor -= endSequenceLength;
endSequenceLength = 0;
}
}
else if (*cursor == ')')
{
// this might be the start of the end delimiter sequence
endSequenceLength = 1;
}
++cursor;
}
if (*cursor != '"')
reportError("expected \"");
++cursor;
token_stream[(int)index].extra.symbol =
control->findOrInsertName((const char*)begin, cursor - begin);
token_stream[(int)index++].kind = Token_string_literal;
}
void Lexer::scan_newline()
{
if (location_table.current_line == location_table.size())
location_table.resize(location_table.current_line * 2);
location_table[(int) location_table.current_line++] = (cursor - begin_buffer);
++cursor;
}
void Lexer::scan_white_spaces()
{
while (isspace(*cursor))
{
if (*cursor == '\n')
scan_newline();
else
++cursor;
}
}
void Lexer::scan_identifier_or_literal()
{
switch (*(cursor + 1))
{
case '\'':
++cursor;
scan_char_constant();
break;
case '\"':
++cursor;
scan_string_constant();
break;
default:
scan_identifier_or_keyword();
break;
}
}
void Lexer::scan_identifier_or_keyword()
{
const unsigned char *skip = cursor;
const unsigned char* start = cursor;
while (isalnum(*skip) || *skip== '_')
++skip;
int n = skip - cursor;
if (*skip == '"' && n <= 3)
{
cursor = skip;
// this should be a unicode and/or raw string -
// we pass through anything that does not follow the standard, though
if (skip[-1] == 'R')
{
scan_raw_string_constant_with_prefix(start);
}
else
{
scan_string_constant_with_prefix(start);
}
}
else if (*skip == '\'' && n <= 2)
{
// probably some special encoding
cursor = skip;
scan_char_constant_with_prefix(start);
}
else
{
Token* current_token = &token_stream[(int)index];
(this->*s_scan_keyword_table[n < 17 ? n : 0])();
if (current_token->kind == Token_identifier)
{
current_token->extra.symbol =
control->findOrInsertName((const char*)cursor, n);
}
cursor = skip;
}
}
void Lexer::scan_int_constant()
{
if (*cursor == '.' && !std::isdigit(*(cursor + 1)))
{
scan_dot();
return;
}
const unsigned char *begin = cursor;
while (isalnum(*cursor) || *cursor == '.')
++cursor;
token_stream[(int) index].extra.symbol =
control->findOrInsertName((const char*) begin, cursor - begin);
token_stream[(int) index++].kind = Token_number_literal;
}
void Lexer::scan_not()
{
/*
'!' ::= not
'!=' ::= not_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_not_eq;
}
else
{
token_stream[(int) index++].kind = '!';
}
}
void Lexer::scan_remainder()
{
/*
'%' ::= remainder
'%=' ::= remainder_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else
{
token_stream[(int) index++].kind = '%';
}
}
void Lexer::scan_and()
{
/*
'&&' ::= and_and
'&' ::= and
'&=' ::= and_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else if (*cursor == '&')
{
++cursor;
token_stream[(int) index++].kind = Token_and;
}
else
{
token_stream[(int) index++].kind = '&';
}
}
void Lexer::scan_left_paren()
{
++cursor;
token_stream[(int) index++].kind = '(';
}
void Lexer::scan_right_paren()
{
++cursor;
token_stream[(int) index++].kind = ')';
}
void Lexer::scan_star()
{
/*
'*' ::= star
'*=' ::= star_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else
{
token_stream[(int) index++].kind = '*';
}
}
void Lexer::scan_plus()
{
/*
'+' ::= plus
'++' ::= incr
'+=' ::= plus_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else if (*cursor == '+')
{
++cursor;
token_stream[(int) index++].kind = Token_incr;
}
else
{
token_stream[(int) index++].kind = '+';
}
}
void Lexer::scan_comma()
{
++cursor;
token_stream[(int) index++].kind = ',';
}
void Lexer::scan_minus()
{
/*
'-' ::= minus
'--' ::= decr
'-=' ::= minus_equal
'->' ::= left_arrow
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else if (*cursor == '-')
{
++cursor;
token_stream[(int) index++].kind = Token_decr;
}
else if (*cursor == '>')
{
++cursor;
token_stream[(int) index++].kind = Token_arrow;
if (*cursor == '*')
{
++cursor;
token_stream[(int) index++].kind = Token_ptrmem;
}
}
else
{
token_stream[(int) index++].kind = '-';
}
}
void Lexer::scan_dot()
{
/*
'.' ::= dot
'...' ::= ellipsis
*/
++cursor;
if (*cursor == '.' && *(cursor + 1) == '.')
{
cursor += 2;
token_stream[(int) index++].kind = Token_ellipsis;
}
else if (*cursor == '.' && *(cursor + 1) == '*')
{
cursor += 2;
token_stream[(int) index++].kind = Token_ptrmem;
}
else
token_stream[(int) index++].kind = '.';
}
void Lexer::scan_divide()
{
/*
'/' ::= divide
'/=' ::= divide_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else
{
token_stream[(int) index++].kind = '/';
}
}
void Lexer::scan_colon()
{
++cursor;
if (*cursor == ':')
{
++cursor;
token_stream[(int) index++].kind = Token_scope;
}
else
{
token_stream[(int) index++].kind = ':';
}
}
void Lexer::scan_semicolon()
{
++cursor;
token_stream[(int) index++].kind = ';';
}
void Lexer::scan_less()
{
/*
'<' ::= less
'<<' ::= left_shift
'<<=' ::= left_shift_equal
'<=' ::= less_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_leq;
}
else if (*cursor == '<')
{
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else
{
token_stream[(int) index++].kind = Token_shift_left;
}
}
else
{
token_stream[(int) index++].kind = '<';
}
}
void Lexer::scan_equal()
{
/*
'=' ::= equal
'==' ::= equal_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_eq;
}
else
{
token_stream[(int) index++].kind = '=';
}
}
void Lexer::scan_greater()
{
/*
'>' ::= greater
'>=' ::= greater_equal
'>>' ::= right_shift
'>>=' ::= right_shift_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_geq;
}
else if (*cursor == '>')
{
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else
{
// may be replaced by two ">" during parsing
token_stream[(int) index++].kind = Token_shift_right;
token_stream[(int) index++].kind = Token_placeholder;
}
}
else
{
token_stream[(int) index++].kind = '>';
}
}
void Lexer::scan_question()
{
++cursor;
token_stream[(int) index++].kind = '?';
}
void Lexer::scan_left_bracket()
{
++cursor;
token_stream[(int) index++].kind = '[';
}
void Lexer::scan_right_bracket()
{
++cursor;
token_stream[(int) index++].kind = ']';
}
void Lexer::scan_xor()
{
/*
'^' ::= xor
'^=' ::= xor_equal
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else
{
token_stream[(int) index++].kind = '^';
}
}
void Lexer::scan_left_brace()
{
++cursor;
token_stream[(int) index++].kind = '{';
}
void Lexer::scan_or()
{
/*
'|' ::= or
'|=' ::= or_equal
'||' ::= or_or
*/
++cursor;
if (*cursor == '=')
{
++cursor;
token_stream[(int) index++].kind = Token_assign;
}
else if (*cursor == '|')
{
++cursor;
token_stream[(int) index++].kind = Token_or;
}
else
{
token_stream[(int) index++].kind = '|';
}
}
void Lexer::scan_right_brace()
{
++cursor;
token_stream[(int) index++].kind = '}';
}
void Lexer::scan_tilde()
{
++cursor;
token_stream[(int) index++].kind = '~';
}
void Lexer::scan_EOF()
{
++cursor;
token_stream[(int) index++].kind = Token_EOF;
}
void Lexer::scan_invalid_input()
{
QString errmsg("invalid input: %1");
reportError(errmsg.arg(int(*cursor)));
++cursor;
}
void LocationTable::positionAt(std::size_t offset, int max_line,
int *line, int *column) const
{
if (!(line && column && max_line != 0))
return;
int first = 0;
int len = max_line;
int half;
int middle;
while (len > 0)
{
half = len >> 1;
middle = first;
middle += half;
if (lines[middle] < offset)
{
first = middle;
++first;
len = len - half - 1;
}
else
len = half;
}
*line = std::max(first, 1);
*column = (int) (offset - lines[*line - 1] - 1);
if (*column < 0)
{
*column = 0;
}
}
void Lexer::scanKeyword0()
{
token_stream[(int) index++].kind = Token_identifier;
}
void Lexer::scanKeyword2()
{
switch (*cursor)
{
case 'i':
if (*(cursor + 1) == 'f')
{
token_stream[(int) index++].kind = Token_if;
return;
}
break;
case 'd':
if (*(cursor + 1) == 'o')
{
token_stream[(int) index++].kind = Token_do;
return;
}
break;
case 'o':
if (*(cursor + 1) == 'r')
{
token_stream[(int) index++].kind = Token_or;
return;
}
break;
}
token_stream[(int) index++].kind = Token_identifier;
}
void Lexer::scanKeyword3()
{
switch (*cursor)
{
case 'a':
if (*(cursor + 1) == 'n' &&
*(cursor + 2) == 'd')
{
token_stream[(int) index++].kind = Token_and;
return;
}
if (*(cursor + 1) == 's' &&
*(cursor + 2) == 'm')
{
token_stream[(int) index++].kind = Token_asm;
return;
}
break;
case 'f':
if (*(cursor + 1) == 'o' &&
*(cursor + 2) == 'r')
{
token_stream[(int) index++].kind = Token_for;
return;
}
break;
case 'i':
if (*(cursor + 1) == 'n' &&
*(cursor + 2) == 't')
{
token_stream[(int) index++].kind = Token_int;
return;
}
break;
case 'n':
if (*(cursor + 1) == 'e' &&
*(cursor + 2) == 'w')
{
token_stream[(int) index++].kind = Token_new;
return;
}
if (*(cursor + 1) == 'o' &&
*(cursor + 2) == 't')
{
token_stream[(int) index++].kind = Token_not;
return;
}
break;
case 't':
if (*(cursor + 1) == 'r' &&
*(cursor + 2) == 'y')
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