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/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
**
**************************************************************************/
#include "glslparser.h"
#include <iostream>
using namespace GLSL;
namespace GLSL {
void dumpAST(AST *);
void deleteAST(AST *ast);
}
Parser::Parser(const char *source, unsigned size, int variant)
: _tos(-1), _index(0)
{
_tokens.reserve(1024);
_stateStack.resize(128);
_locationStack.resize(128);
_astStack.resize(128);
_tokens.push_back(Token()); // invalid token
std::stack<int> parenStack;
std::stack<int> bracketStack;
std::stack<int> braceStack;
Lexer lexer(source, size);
lexer.setVariant(variant);
Token tk;
do {
lexer.yylex(&tk);
switch (tk.kind) {
case T_LEFT_PAREN:
parenStack.push(_tokens.size());
break;
case T_LEFT_BRACKET:
bracketStack.push(_tokens.size());
break;
case T_LEFT_BRACE:
braceStack.push(_tokens.size());
break;
case T_RIGHT_PAREN:
if (! parenStack.empty()) {
_tokens[parenStack.top()].matchingBrace = _tokens.size();
parenStack.pop();
}
break;
case T_RIGHT_BRACKET:
if (! bracketStack.empty()) {
_tokens[bracketStack.top()].matchingBrace = _tokens.size();
bracketStack.pop();
}
break;
case T_RIGHT_BRACE:
if (! braceStack.empty()) {
_tokens[braceStack.top()].matchingBrace = _tokens.size();
braceStack.pop();
}
break;
default:
break;
}
_tokens.push_back(tk);
} while (tk.isNot(EOF_SYMBOL));
_index = 1;
}
Parser::~Parser()
{
}
void Parser::dump(AST *ast)
{
dumpAST(ast);
}
bool Parser::parse()
{
int action = 0;
int yytoken = -1;
int yyloc = -1;
Operand *opd = 0;
_tos = -1;
do {
if (yytoken == -1 && -TERMINAL_COUNT != action_index[action]) {
yyloc = consumeToken();
yytoken = tokenKind(yyloc);
if (yytoken == T_IDENTIFIER && t_action(action, T_TYPE_NAME) != 0) {
const Token &la = tokenAt(_index);
if (la.is(T_IDENTIFIER)) {
yytoken = T_TYPE_NAME;
} else if (la.is(T_LEFT_BRACKET) && la.matchingBrace != 0 &&
tokenAt(la.matchingBrace + 1).is(T_IDENTIFIER)) {
yytoken = T_TYPE_NAME;
}
}
opd = new Operand(yyloc);
}
if (unsigned(++_tos) == _stateStack.size()) {
_stateStack.resize(_tos * 2);
_locationStack.resize(_tos * 2);
_astStack.resize(_tos * 2);
}
_stateStack[_tos] = action;
action = t_action(action, yytoken);
if (action > 0) {
if (action == ACCEPT_STATE) {
--_tos;
dump(_astStack[0]);
deleteAST(_astStack[0]);
return true;
}
_astStack[_tos] = opd;
_locationStack[_tos] = yyloc;
yytoken = -1;
} else if (action < 0) {
const int ruleno = -action - 1;
const int N = rhs[ruleno];
_tos -= N;
if (N == 0)
_astStack[_tos] = 0;
else
_astStack[_tos] = new Operator(ruleno, &_astStack[_tos], &_astStack[_tos + N]);
action = nt_action(_stateStack[_tos], lhs[ruleno] - TERMINAL_COUNT);
}
} while (action);
fprintf(stderr, "unexpected token `%s' at line %d\n", yytoken != -1 ? spell[yytoken] : "",
_tokens[yyloc].line + 1);
return false;
}
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