--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/util/qlalr/recognizer.cpp Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,488 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the utils of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "recognizer.h"
+#include <cstdlib>
+#include <cstring>
+#include <cctype>
+
+Recognizer::Recognizer (Grammar *grammar, bool no_lines):
+ tos(0),
+ stack_size(0),
+ state_stack(0),
+ _M_line(1),
+ _M_action_line(0),
+ _M_grammar(grammar),
+ _M_no_lines(no_lines)
+{
+}
+
+Recognizer::~Recognizer()
+{
+ if (stack_size)
+ ::qFree(state_stack);
+}
+
+inline void Recognizer::reallocateStack()
+{
+ if (! stack_size)
+ stack_size = 128;
+ else
+ stack_size <<= 1;
+
+ sym_stack.resize (stack_size);
+
+ if (! state_stack)
+ state_stack = reinterpret_cast<int*> (::qMalloc(stack_size * sizeof(int)));
+ else
+ state_stack = reinterpret_cast<int*> (::qRealloc(state_stack, stack_size * sizeof(int)));
+}
+
+int Recognizer::nextToken()
+{
+ QString text;
+
+ Lagain:
+ while (ch.isSpace ())
+ inp ();
+
+ if (ch.isNull ())
+ return EOF_SYMBOL;
+
+ int token = ch.unicode ();
+
+ if (token == '"')
+ {
+ inp(); // skip "
+ text.clear ();
+ while (! ch.isNull () && ch != QLatin1Char ('"'))
+ {
+ if (ch == QLatin1Char ('\\'))
+ {
+ text += ch;
+ inp();
+ }
+ text += ch;
+ inp ();
+ }
+
+ if (ch == QLatin1Char ('"'))
+ inp ();
+ else
+ qerr << _M_input_file << ":" << _M_line << ": Warning. Expected `\"'" << endl;
+
+ _M_current_value = text;
+ return (token = STRING_LITERAL);
+ }
+
+ else if (ch.isLetterOrNumber () || ch == QLatin1Char ('_'))
+ {
+ text.clear ();
+ do { text += ch; inp (); }
+ while (ch.isLetterOrNumber () || ch == QLatin1Char ('_') || ch == QLatin1Char ('.'));
+ _M_current_value = text;
+ return (token = ID);
+ }
+
+ else if (token == '%')
+ {
+ text.clear ();
+
+ do { inp (); }
+ while (ch.isSpace ());
+
+ do { text += ch; inp (); }
+ while (ch.isLetterOrNumber () || ch == QLatin1Char ('_') || ch == QLatin1Char ('-'));
+
+ if (text == QLatin1String("token_prefix"))
+ return (token = TOKEN_PREFIX);
+ else if (text == QLatin1String("merged_output"))
+ return (token = MERGED_OUTPUT);
+ else if (text == QLatin1String("token"))
+ return (token = TOKEN);
+ else if (text == QLatin1String("start"))
+ return (token = START);
+ else if (text == QLatin1String("parser"))
+ return (token = PARSER);
+ else if (text == QLatin1String("decl"))
+ return (token = DECL_FILE);
+ else if (text == QLatin1String("impl"))
+ return (token = IMPL_FILE);
+ else if (text == QLatin1String("expect"))
+ return (token = EXPECT);
+ else if (text == QLatin1String("expect-rr"))
+ return (token = EXPECT_RR);
+ else if (text == QLatin1String("left"))
+ return (token = LEFT);
+ else if (text == QLatin1String("right"))
+ return (token = RIGHT);
+ else if (text == QLatin1String("nonassoc"))
+ return (token = NONASSOC);
+ else if (text == QLatin1String("prec"))
+ return (token = PREC);
+ else
+ {
+ qerr << _M_input_file << ":" << _M_line << ": Unknown keyword `" << text << "'" << endl;
+ exit (EXIT_FAILURE);
+ return (token = ERROR);
+ }
+ }
+
+ inp ();
+
+ if (token == '-' && ch == QLatin1Char ('-'))
+ {
+ do { inp (); }
+ while (! ch.isNull () && ch != QLatin1Char ('\n'));
+ goto Lagain;
+ }
+
+ else if (token == ':' && ch == QLatin1Char (':'))
+ {
+ inp ();
+ if (ch != QLatin1Char ('='))
+ return (token = ERROR);
+ inp ();
+ return (token = COLON);
+ }
+
+ else if (token == '/' && ch == QLatin1Char (':'))
+ {
+ _M_action_line = _M_line;
+
+ text.clear ();
+ if (! _M_no_lines)
+ text += QLatin1String ("\n#line ") + QString::number (_M_action_line) + " \"" + _M_input_file + "\"\n";
+ inp (); // skip ':'
+
+ forever
+ {
+ while (! ch.isNull ())
+ {
+ token = ch.unicode ();
+ inp ();
+
+ if (token == ':' && ch == QLatin1Char ('/'))
+ break;
+
+ text += QLatin1Char (token);
+ }
+
+ if (ch != QLatin1Char ('/'))
+ return (token = ERROR);
+
+ inp ();
+
+ if (ch.isNull () || ch.isSpace ())
+ {
+ _M_current_value = text;
+ return (token = DECL);
+ }
+ else
+ text += QLatin1String (":/");
+ }
+ }
+
+ else if (token == '/' && ch == QLatin1Char ('.'))
+ {
+ _M_action_line = _M_line;
+
+ text.clear ();
+ if (! _M_no_lines)
+ text += QLatin1String ("\n#line ") + QString::number (_M_action_line) + " \"" + _M_input_file + "\"\n";
+
+ inp (); // skip ':'
+
+ forever
+ {
+ while (! ch.isNull ())
+ {
+ token = ch.unicode ();
+ inp ();
+
+ if (token == '.' && ch == QLatin1Char ('/'))
+ break;
+
+ text += QLatin1Char (token);
+ }
+
+ if (ch != QLatin1Char ('/'))
+ return (token = ERROR);
+
+ inp ();
+
+ if (ch.isNull () || ch.isSpace ())
+ {
+ _M_current_value = text;
+ return (token = IMPL);
+ }
+ else
+ text += QLatin1String ("");
+ }
+ }
+
+ switch (token) {
+ case ':':
+ return (token = COLON);
+
+ case ';':
+ return (token = SEMICOLON);
+
+ case '|':
+ return (token = OR);
+
+ default:
+ break;
+ }
+
+ return token;
+}
+
+bool Recognizer::parse (const QString &input_file)
+{
+ _M_input_file = input_file;
+
+ QFile file(_M_input_file);
+ if (! file.open(QFile::ReadOnly))
+ {
+ qerr << "qlalr: no input file\n";
+ return false;
+ }
+
+ QString _M_contents = QTextStream(&file).readAll();
+ _M_firstChar = _M_contents.constBegin();
+ _M_lastChar = _M_contents.constEnd();
+ _M_currentChar = _M_firstChar;
+ _M_line = 1;
+
+ int yytoken = -1;
+ inp ();
+
+ reallocateStack();
+
+ _M_current_rule = _M_grammar->rules.end ();
+ _M_decls.clear ();
+ _M_impls.clear ();
+
+ tos = 0;
+ state_stack[++tos] = 0;
+
+ while (true)
+ {
+ if (yytoken == -1 && - TERMINAL_COUNT != action_index [state_stack [tos]])
+ yytoken = nextToken();
+
+ int act = t_action (state_stack [tos], yytoken);
+
+ if (act == ACCEPT_STATE)
+ return true;
+
+ else if (act > 0)
+ {
+ if (++tos == stack_size)
+ reallocateStack();
+
+ sym_stack [tos] = _M_current_value;
+ state_stack [tos] = act;
+ yytoken = -1;
+ }
+
+ else if (act < 0)
+ {
+ int r = - act - 1;
+
+ tos -= rhs [r];
+ act = state_stack [tos++];
+
+ switch (r) {
+
+case 3: {
+ Name name = _M_grammar->intern (sym(2));
+ _M_grammar->start = name;
+ _M_grammar->non_terminals.insert (name);
+} break;
+
+case 5: {
+ _M_grammar->table_name = sym(2);
+} break;
+
+case 6: {
+ _M_grammar->merged_output = sym(2);
+} break;
+
+case 7: {
+ _M_grammar->decl_file_name = sym(2);
+} break;
+
+case 8: {
+ _M_grammar->impl_file_name = sym(2);
+} break;
+
+case 9: {
+ _M_grammar->expected_shift_reduce = sym(2).toInt();
+} break;
+
+case 10: {
+ _M_grammar->expected_reduce_reduce = sym(2).toInt();
+} break;
+
+case 11: {
+ _M_grammar->token_prefix = sym(2);
+} break;
+case 17:case 18: {
+ Name name = _M_grammar->intern (sym(1));
+ _M_grammar->terminals.insert (name);
+ _M_grammar->spells.insert (name, sym(2));
+} break;
+
+case 19: {
+ _M_grammar->current_assoc = Grammar::Left;
+ ++_M_grammar->current_prec;
+} break;
+
+case 20: {
+ _M_grammar->current_assoc = Grammar::Right;
+ ++_M_grammar->current_prec;
+} break;
+
+case 21: {
+ _M_grammar->current_assoc = Grammar::NonAssoc;
+ ++_M_grammar->current_prec;
+} break;
+
+case 25: {
+ Name name = _M_grammar->intern (sym(1));
+ _M_grammar->terminals.insert (name);
+
+ Grammar::TokenInfo info;
+ info.prec = _M_grammar->current_prec;
+ info.assoc = _M_grammar->current_assoc;
+ _M_grammar->token_info.insert (name, info);
+} break;
+
+case 26: {
+ _M_decls += expand (sym(1));
+} break;
+
+case 27: {
+ _M_impls += expand (sym(1));
+} break;
+
+case 34: {
+ _M_current_rule = _M_grammar->rules.insert (_M_grammar->rules.end (), Rule ());
+ _M_current_rule->lhs = _M_grammar->intern (sym(1));
+ _M_grammar->declared_lhs.insert (_M_current_rule->lhs);
+
+ if (_M_grammar->terminals.find (_M_current_rule->lhs) != _M_grammar->terminals.end ())
+ {
+ qerr << _M_input_file << ":" << _M_line << ": Invalid non terminal `" << *_M_current_rule->lhs << "'" << endl;
+ return false;
+ }
+
+ _M_grammar->non_terminals.insert (_M_current_rule->lhs);
+} break;
+
+case 38: {
+ Name lhs = _M_current_rule->lhs;
+ _M_current_rule = _M_grammar->rules.insert (_M_grammar->rules.end (), Rule ());
+ _M_current_rule->lhs = lhs;
+ _M_grammar->declared_lhs.insert (_M_current_rule->lhs);
+
+ if (_M_grammar->terminals.find (_M_current_rule->lhs) != _M_grammar->terminals.end ())
+ {
+ qerr << _M_input_file << ":" << _M_line << ": Invalid non terminal `" << *_M_current_rule->lhs << "'" << endl;
+ return false;
+ }
+
+ _M_grammar->non_terminals.insert (_M_current_rule->lhs);
+} break;
+
+case 39: {
+ _M_current_rule->prec = _M_grammar->names.end ();
+
+ for (NameList::iterator it = _M_current_rule->rhs.begin (); it != _M_current_rule->rhs.end (); ++it)
+ {
+ if (! _M_grammar->isTerminal (*it))
+ continue;
+
+ _M_current_rule->prec = *it;
+ }
+} break;
+
+case 40: {
+ Name tok = _M_grammar->intern (sym(2));
+ if (! _M_grammar->isTerminal (tok))
+ {
+ qerr << _M_input_file << ":" << _M_line << ": `" << *tok << " is not a terminal symbol" << endl;
+ _M_current_rule->prec = _M_grammar->names.end ();
+ }
+ else
+ _M_current_rule->prec = tok;
+} break;
+
+case 42: {
+ Name name = _M_grammar->intern (sym(2));
+
+ if (_M_grammar->terminals.find (name) == _M_grammar->terminals.end ())
+ _M_grammar->non_terminals.insert (name);
+
+ _M_current_rule->rhs.push_back (name);
+} break;
+
+case 43: {
+ sym(1) = QString();
+} break;
+
+ } // switch
+
+ state_stack [tos] = nt_action (act, lhs [r] - TERMINAL_COUNT);
+ }
+
+ else
+ {
+ break;
+ }
+ }
+
+ qerr << _M_input_file << ":" << _M_line << ": Syntax error" << endl;
+ return false;
+}
+