diff options
Diffstat (limited to 'src/libs/modelinglib/qstringparser/qstringparser.cpp')
| -rw-r--r-- | src/libs/modelinglib/qstringparser/qstringparser.cpp | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/src/libs/modelinglib/qstringparser/qstringparser.cpp b/src/libs/modelinglib/qstringparser/qstringparser.cpp new file mode 100644 index 0000000000..dbacef18fc --- /dev/null +++ b/src/libs/modelinglib/qstringparser/qstringparser.cpp @@ -0,0 +1,212 @@ +/*************************************************************************** +** +** Copyright (C) 2015 Jochen Becher +** Contact: http://www.qt.io/licensing +** +** This file is part of Qt Creator. +** +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms and +** conditions see http://www.qt.io/terms-conditions. For further information +** use the contact form at http://www.qt.io/contact-us. +** +** 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 or version 3 as published by the Free +** Software Foundation and appearing in the file LICENSE.LGPLv21 and +** LICENSE.LGPLv3 included in the packaging of this file. Please review the +** following information to ensure the GNU Lesser General Public License +** requirements will be met: https://www.gnu.org/licenses/lgpl.html and +** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, The Qt Company gives you certain additional +** rights. These rights are described in The Qt Company LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +****************************************************************************/ + +#include "qstringparser.h" + +// Possible Improvements +// %w: skip optional whitespaces in m_source +// more types: different int types, float, char, word, some character delimited string +// some Q Types: QColor (named, hex rgb) +// introduce public type ParseState which can be got from Parser and gives some info like error state, error index etc + +QStringParser::QStringParser(const QString &source) + : m_source(source) +{ +} + +QStringParser::~QStringParser() +{ +} + +QStringParser::Parser QStringParser::parse(const QString &pattern) +{ + return Parser(m_source, pattern); +} + +QStringParser::Parser::Parser(const QString &source, const QString &pattern) + : m_source(source), + m_pattern(pattern) +{ +} + +QStringParser::Parser::~Parser() +{ + evaluate(); + qDeleteAll(m_nodes); +} + +bool QStringParser::Parser::failed() +{ + evaluate(); + return m_evaluationFailed; +} + +bool QStringParser::Parser::scan(int *i, int *index) +{ + *i = 0; + int sign = 1; + while (*index < m_source.length() && m_source.at(*index).isSpace()) + ++(*index); + if (*index >= m_source.length()) + return false; + if (m_source.at(*index) == QLatin1Char('+')) { + ++(*index); + } else if (m_source.at(*index) == QLatin1Char('-')) { + sign = -1; + ++(*index); + } + if (*index >= m_source.length() || !m_source.at(*index).isDigit()) + return false; + while (*index < m_source.length() && m_source.at(*index).isDigit()) { + *i = *i * 10 + m_source.at(*index).digitValue(); + ++(*index); + } + *i *= sign; + return true; +} + +bool QStringParser::Parser::scan(double *d, int *index) +{ + int startIndex = *index; + // skip whitespaces + while (*index < m_source.length() && m_source.at(*index).isSpace()) + ++(*index); + if (*index >= m_source.length()) + return false; + // sign + if (m_source.at(*index) == QLatin1Char('+')) + ++(*index); + else if (m_source.at(*index) == QLatin1Char('-')) + ++(*index); + // int + while (*index < m_source.length() && m_source.at(*index).isDigit()) + ++(*index); + // point + if (*index < m_source.length() && m_source.at(*index) == QLatin1Char('.')) + ++(*index); + // int + while (*index < m_source.length() && m_source.at(*index).isDigit()) + ++(*index); + // exponent + if (*index < m_source.length() && m_source.at(*index).toLower() == QLatin1Char('e')) { + ++(*index); + if (*index >= m_source.length()) + return false; + // sign + if (m_source.at(*index) == QLatin1Char('+')) + ++(*index); + else if (m_source.at(*index) == QLatin1Char('-')) + ++(*index); + // int + while (*index < m_source.length() && m_source.at(*index).isDigit()) + ++(*index); + } + bool ok = false; + *d = m_source.mid(startIndex, *index - startIndex).toDouble(&ok); + return ok; +} + +void QStringParser::Parser::evaluate() +{ + if (!m_isEvaluated) { + m_isEvaluated = true; + m_evaluationFailed = false; + + int p = 0; + int i = 0; + while (p < m_pattern.length()) { + if (m_pattern.at(p) == QLatin1Char('%')) { + ++p; + // a % must be followed by a another char. + if (p >= m_pattern.length()) { + // syntax error in pattern + m_evaluationFailed = true; + return; + } + if (m_pattern.at(p) == QLatin1Char('%')) { + // two %% are handled like a simple % in m_source + ++p; + if (i >= m_source.length() || m_source.at(i) != QLatin1Char('%')) { + m_evaluationFailed = true; + return; + } + ++i; + } else if (m_pattern.at(p).isDigit()) { + // now extract a value matching the Nth node type + int N = 0; + while (p < m_pattern.length() && m_pattern.at(p).isDigit()) { + N = N * 10 + m_pattern.at(p).digitValue(); + ++p; + } + if (N < 1 || N > m_nodes.length()) { + // argument out of bounds in pattern + m_evaluationFailed = true; + return; + } + if (!m_nodes.at(N-1)->accept(*this, &i)) { + m_evaluationFailed = true; + return; + } + } else { + // any other % syntax is an error + m_evaluationFailed = true; + return; + } + } else { + if (m_pattern.at(p).isSpace()) { + ++p; + // m_source must end or have at least one space + if (i < m_source.length() && !m_source.at(i).isSpace()) { + m_evaluationFailed = true; + return; + } + // skip spaces in m_pattern + while (p < m_pattern.length() && m_pattern.at(p).isSpace()) + ++p; + + // skip spaces in m_source + while (i < m_source.length() && m_source.at(i).isSpace()) + ++i; + } else if (i >= m_source.length() || m_source.at(i) != m_pattern.at(p)) { + m_evaluationFailed = true; + return; + } else { + ++p; + ++i; + } + } + } + // m_source and m_pattern must both be scanned completely + if (i < m_source.length() || p < m_pattern.length()) { + m_evaluationFailed = true; + return; + } + } +} |