author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 00:43:10 +0200 | |
changeset 3 | 41300fa6a67c |
parent 0 | 1918ee327afb |
child 4 | 3b1da2848fc7 |
permissions | -rw-r--r-- |
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/**************************************************************************** |
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** |
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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** All rights reserved. |
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** Contact: Nokia Corporation (qt-info@nokia.com) |
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** |
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** This file is part of the QtScript module of the Qt Toolkit. |
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** |
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41300fa6a67c
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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diff
changeset
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** $QT_BEGIN_LICENSE:LGPL-ONLY$ |
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** GNU Lesser General Public License Usage |
3
41300fa6a67c
Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
0
diff
changeset
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** This file may be used under the terms of the GNU Lesser |
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** General Public License version 2.1 as published by the Free Software |
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** Foundation and appearing in the file LICENSE.LGPL included in the |
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** packaging of this file. Please review the following information to |
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** ensure the GNU Lesser General Public License version 2.1 requirements |
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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** |
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** If you have questions regarding the use of this file, please contact |
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** Nokia at qt-info@nokia.com. |
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** $QT_END_LICENSE$ |
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** |
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****************************************************************************/ |
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#include "qscriptsyntaxchecker_p.h" |
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#include "qscriptlexer_p.h" |
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#include "qscriptparser_p.h" |
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QT_BEGIN_NAMESPACE |
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namespace QScript { |
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SyntaxChecker::SyntaxChecker(): |
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tos(0), |
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stack_size(0), |
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state_stack(0) |
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{ |
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} |
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SyntaxChecker::~SyntaxChecker() |
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{ |
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if (stack_size) { |
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qFree(state_stack); |
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} |
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} |
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bool SyntaxChecker::automatic(QScript::Lexer *lexer, int token) const |
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{ |
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return token == T_RBRACE || token == 0 || lexer->prevTerminator(); |
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} |
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SyntaxChecker::Result SyntaxChecker::checkSyntax(const QString &code) |
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{ |
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const int INITIAL_STATE = 0; |
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QScript::Lexer lexer (/*engine=*/ 0); |
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lexer.setCode(code, /*lineNo*/ 1); |
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int yytoken = -1; |
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int saved_yytoken = -1; |
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QString error_message; |
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int error_lineno = -1; |
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int error_column = -1; |
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State checkerState = Valid; |
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reallocateStack(); |
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tos = 0; |
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state_stack[++tos] = INITIAL_STATE; |
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while (true) |
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{ |
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const int state = state_stack [tos]; |
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if (yytoken == -1 && - TERMINAL_COUNT != action_index [state]) |
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{ |
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if (saved_yytoken == -1) |
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yytoken = lexer.lex(); |
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else |
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{ |
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yytoken = saved_yytoken; |
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saved_yytoken = -1; |
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} |
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} |
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int act = t_action (state, yytoken); |
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if (act == ACCEPT_STATE) { |
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if (lexer.error() == QScript::Lexer::UnclosedComment) |
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checkerState = Intermediate; |
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else |
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checkerState = Valid; |
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break; |
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} else if (act > 0) { |
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if (++tos == stack_size) |
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reallocateStack(); |
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state_stack [tos] = act; |
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yytoken = -1; |
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} |
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else if (act < 0) |
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{ |
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int r = - act - 1; |
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tos -= rhs [r]; |
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act = state_stack [tos++]; |
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if ((r == Q_SCRIPT_REGEXPLITERAL_RULE1) |
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|| (r == Q_SCRIPT_REGEXPLITERAL_RULE2)) { |
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// Skip the rest of the RegExp literal |
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bool rx = lexer.scanRegExp(); |
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if (!rx) { |
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checkerState = Intermediate; |
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break; |
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} |
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} |
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state_stack [tos] = nt_action (act, lhs [r] - TERMINAL_COUNT); |
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} |
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else |
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{ |
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if (saved_yytoken == -1 && automatic (&lexer, yytoken) && t_action (state, T_AUTOMATIC_SEMICOLON) > 0) |
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{ |
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saved_yytoken = yytoken; |
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yytoken = T_SEMICOLON; |
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continue; |
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} |
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else if ((state == INITIAL_STATE) && (yytoken == 0)) { |
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// accept empty input |
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yytoken = T_SEMICOLON; |
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continue; |
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} |
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int ers = state; |
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int shifts = 0; |
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int reduces = 0; |
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int expected_tokens [3]; |
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for (int tk = 0; tk < TERMINAL_COUNT; ++tk) |
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{ |
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int k = t_action (ers, tk); |
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if (! k) |
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continue; |
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else if (k < 0) |
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++reduces; |
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else if (spell [tk]) |
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{ |
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if (shifts < 3) |
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expected_tokens [shifts] = tk; |
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++shifts; |
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} |
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} |
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error_message.clear (); |
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if (shifts && shifts < 3) |
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{ |
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bool first = true; |
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for (int s = 0; s < shifts; ++s) |
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{ |
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if (first) |
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error_message += QLatin1String ("Expected "); |
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else |
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error_message += QLatin1String (", "); |
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first = false; |
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error_message += QLatin1Char('`'); |
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error_message += QLatin1String (spell [expected_tokens [s]]); |
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error_message += QLatin1Char('\''); |
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} |
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} |
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if (error_message.isEmpty()) |
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error_message = lexer.errorMessage(); |
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error_lineno = lexer.startLineNo(); |
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error_column = lexer.startColumnNo(); |
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checkerState = Error; |
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break; |
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} |
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} |
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if (checkerState == Error) { |
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if (lexer.error() == QScript::Lexer::UnclosedComment) |
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checkerState = Intermediate; |
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else if (yytoken == 0) |
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checkerState = Intermediate; |
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} |
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return Result(checkerState, error_lineno, error_column, error_message); |
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} |
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} // namespace QScript |
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QT_END_NAMESPACE |