| /**************************************************************************** |
| ** |
| ** Copyright (C) 2015 The Qt Company Ltd. |
| ** Contact: http://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtScript module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL-ONLY$ |
| ** GNU Lesser General Public License Usage |
| ** 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 have questions regarding the use of this file, please contact |
| ** us via http://www.qt.io/contact-us/. |
| ** |
| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "qscriptsyntaxchecker_p.h" |
| |
| #include "qscriptlexer_p.h" |
| #include "qscriptparser_p.h" |
| |
| #include <stdlib.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QScript { |
| |
| |
| SyntaxChecker::SyntaxChecker(): |
| tos(0), |
| stack_size(0), |
| state_stack(0) |
| { |
| } |
| |
| SyntaxChecker::~SyntaxChecker() |
| { |
| if (stack_size) { |
| free(state_stack); |
| } |
| } |
| |
| bool SyntaxChecker::automatic(QScript::Lexer *lexer, int token) const |
| { |
| return token == T_RBRACE || token == 0 || lexer->prevTerminator(); |
| } |
| |
| SyntaxChecker::Result SyntaxChecker::checkSyntax(const QString &code) |
| { |
| const int INITIAL_STATE = 0; |
| QScript::Lexer lexer (/*engine=*/ 0); |
| lexer.setCode(code, /*lineNo*/ 1); |
| |
| int yytoken = -1; |
| int saved_yytoken = -1; |
| QString error_message; |
| int error_lineno = -1; |
| int error_column = -1; |
| State checkerState = Valid; |
| |
| reallocateStack(); |
| |
| tos = 0; |
| state_stack[++tos] = INITIAL_STATE; |
| |
| while (true) |
| { |
| const int state = state_stack [tos]; |
| if (yytoken == -1 && - TERMINAL_COUNT != action_index [state]) |
| { |
| if (saved_yytoken == -1) |
| yytoken = lexer.lex(); |
| else |
| { |
| yytoken = saved_yytoken; |
| saved_yytoken = -1; |
| } |
| } |
| |
| int act = t_action (state, yytoken); |
| |
| if (act == ACCEPT_STATE) { |
| if (lexer.error() == QScript::Lexer::UnclosedComment) |
| checkerState = Intermediate; |
| else |
| checkerState = Valid; |
| break; |
| } else if (act > 0) { |
| if (++tos == stack_size) |
| reallocateStack(); |
| |
| state_stack [tos] = act; |
| yytoken = -1; |
| } |
| |
| else if (act < 0) |
| { |
| int r = - act - 1; |
| |
| tos -= rhs [r]; |
| act = state_stack [tos++]; |
| |
| if ((r == Q_SCRIPT_REGEXPLITERAL_RULE1) |
| || (r == Q_SCRIPT_REGEXPLITERAL_RULE2)) { |
| // Skip the rest of the RegExp literal |
| bool rx = lexer.scanRegExp(); |
| if (!rx) { |
| checkerState = Intermediate; |
| break; |
| } |
| } |
| |
| state_stack [tos] = nt_action (act, lhs [r] - TERMINAL_COUNT); |
| } |
| |
| else |
| { |
| if (saved_yytoken == -1 && automatic (&lexer, yytoken) && t_action (state, T_AUTOMATIC_SEMICOLON) > 0) |
| { |
| saved_yytoken = yytoken; |
| yytoken = T_SEMICOLON; |
| continue; |
| } |
| |
| else if ((state == INITIAL_STATE) && (yytoken == 0)) { |
| // accept empty input |
| yytoken = T_SEMICOLON; |
| continue; |
| } |
| |
| int ers = state; |
| int shifts = 0; |
| int reduces = 0; |
| int expected_tokens [3]; |
| for (int tk = 0; tk < TERMINAL_COUNT; ++tk) |
| { |
| int k = t_action (ers, tk); |
| |
| if (! k) |
| continue; |
| else if (k < 0) |
| ++reduces; |
| else if (spell [tk]) |
| { |
| if (shifts < 3) |
| expected_tokens [shifts] = tk; |
| ++shifts; |
| } |
| } |
| |
| error_message.clear (); |
| if (shifts && shifts < 3) |
| { |
| bool first = true; |
| |
| for (int s = 0; s < shifts; ++s) |
| { |
| if (first) |
| error_message += QLatin1String ("Expected "); |
| else |
| error_message += QLatin1String (", "); |
| |
| first = false; |
| error_message += QLatin1Char('`'); |
| error_message += QLatin1String (spell [expected_tokens [s]]); |
| error_message += QLatin1Char('\''); |
| } |
| } |
| |
| if (error_message.isEmpty()) |
| error_message = lexer.errorMessage(); |
| |
| error_lineno = lexer.startLineNo(); |
| error_column = lexer.startColumnNo(); |
| checkerState = Error; |
| break; |
| } |
| } |
| |
| if (checkerState == Error) { |
| if (lexer.error() == QScript::Lexer::UnclosedComment) |
| checkerState = Intermediate; |
| else if (yytoken == 0) |
| checkerState = Intermediate; |
| } |
| return Result(checkerState, error_lineno, error_column, error_message); |
| } |
| |
| } // namespace QScript |
| |
| QT_END_NAMESPACE |