mirror of
https://github.com/strawberrymusicplayer/strawberry
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131 lines
4.3 KiB
C++
131 lines
4.3 KiB
C++
/* This file is part of Strawberry.
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Copyright 2010, David Sansome <me@davidsansome.com>
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Strawberry is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Strawberry is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Strawberry. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <functional>
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#include <QList>
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#include <QVariant>
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#include <QString>
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#include <QChar>
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#include "fmpsparser.h"
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using std::placeholders::_1;
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using std::placeholders::_2;
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FMPSParser::FMPSParser() :
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// The float regex ends with (?:$|(?=::|;;)) to ensure it matches all the way
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// up to the end of the value. Without it, it would match a string that
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// starts with a number, like "123abc".
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float_re_("\\s*([+-]?\\d+(?:\\.\\d+)?)\\s*(?:$|(?=::|;;))"),
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// Matches any character except unescaped slashes, colons and semicolons.
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string_re_("((?:[^\\\\;:]|(?:\\\\[\\\\:;]))+)(?:$|(?=::|;;))"),
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// Used for replacing escaped characters.
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escape_re_("\\\\([\\\\:;])") {}
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// Parses a list of things (of type T) that are separated by two consecutive
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// Separator characters. Each individual thing is parsed by the F function.
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// For example, to parse this data:
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// foo::bar::baz
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// Use:
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// QVariantList ret;
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// ParseContainer<':'>(data, ParseValue, &ret);
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// ret will then contain "foo", "bar", and "baz".
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// Returns the number of characters that were consumed from data.
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//
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// You can parse lists of lists by using different separator characters:
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// ParseContainer<';'>(data, ParseContainer<':'>, &ret);
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template <char Separator, typename F, typename T>
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static int ParseContainer(const QStringRef& data, F f, QList<T>* ret) {
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ret->clear();
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T value;
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int pos = 0;
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while (pos < data.length()) {
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const int len = data.length() - pos;
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int matched_len = f(QStringRef(data.string(), data.position() + pos, len), &value);
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if (matched_len == -1 || matched_len > len)
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break;
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ret->append(value);
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pos += matched_len;
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// Expect two separators in a row
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if (pos + 2 <= data.length() && data.at(pos) == Separator && data.at(pos+1) == Separator) {
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pos += 2;
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} else {
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break;
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}
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}
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return pos;
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}
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bool FMPSParser::Parse(const QString &data) {
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result_ = Result();
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// Only return success if we matched the whole string
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return ParseListList(data, &result_) == data.length();
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}
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int FMPSParser::ParseValueRef(const QStringRef& data, QVariant* ret) const {
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// Try to match a float
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int pos = float_re_.indexIn(*data.string(), data.position());
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if (pos == data.position()) {
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*ret = float_re_.cap(1).toDouble();
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return float_re_.matchedLength();
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}
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// Otherwise try to match a string
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pos = string_re_.indexIn(*data.string(), data.position());
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if (pos == data.position()) {
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// Replace escape sequences with their actual characters
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QString value = string_re_.cap(1);
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value.replace(escape_re_, "\\1");
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*ret = value;
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return string_re_.matchedLength();
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}
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return -1;
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}
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// Parses an inner list - a list of values
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int FMPSParser::ParseListRef(const QStringRef &data, QVariantList *ret) const {
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return ParseContainer<':'>(data, std::bind(&FMPSParser::ParseValueRef, this, _1, _2), ret);
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}
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// Parses an outer list - a list of lists
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int FMPSParser::ParseListListRef(const QStringRef &data, Result *ret) const {
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return ParseContainer<';'>(data, std::bind(&FMPSParser::ParseListRef, this, _1, _2), ret);
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}
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// Convenience functions that take QStrings instead of QStringRefs. Use the QStringRef versions if possible, they're faster.
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int FMPSParser::ParseValue(const QString &data, QVariant *ret) const {
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return ParseValueRef(QStringRef(&data), ret);
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}
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int FMPSParser::ParseList(const QString &data, QVariantList *ret) const {
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return ParseListRef(QStringRef(&data), ret);
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}
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int FMPSParser::ParseListList(const QString &data, Result *ret) const {
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return ParseListListRef(QStringRef(&data), ret);
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}
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