added INI parser
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f396b8afa1
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@ -29,7 +29,8 @@ SOURCES += \
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io/ansiescapecodes.cpp \
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misc/random.cpp \
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io/bitreader.cpp \
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application/commandlineutils.cpp
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application/commandlineutils.cpp \
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io/inifile.cpp
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HEADERS += \
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application/global.h \
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@ -54,7 +55,8 @@ HEADERS += \
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misc/memory.h \
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misc/random.h \
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io/bitreader.h \
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application/commandlineutils.h
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application/commandlineutils.h \
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io/inifile.h
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OTHER_FILES += \
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README.md \
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@ -0,0 +1,155 @@
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#include "inifile.h"
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#include <iostream>
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using namespace std;
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namespace IoUtilities {
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/*!
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* \brief Parses all data from the specified \a inputStream.
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*/
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void IniFile::parse(std::istream &inputStream)
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{
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// define variable for state machine
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enum State {Init, Comment, ScopeName, Key, Value} state = Init;
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// current character
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char c;
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// number of postponed whitespaces
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unsigned int whitespace = 0;
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// current scope, key and value
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string scope, key, value;
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scope.reserve(16);
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key.reserve(16);
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value.reserve(256);
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// define actions for state machine
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// called when key/value pair is complete
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auto finishKeyValue = [&scope, &key, &value, &whitespace, this] {
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m_data[scope].insert(make_pair(key, value));
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key.clear();
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value.clear();
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whitespace = 0;
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};
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// called to add current character to current key or value
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auto addChar = [&whitespace, &c] (string &to) {
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if(c == ' ') {
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++whitespace;
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} else {
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if(!to.empty()) {
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while(whitespace) {
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to += ' ';
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--whitespace;
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}
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} else {
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whitespace = 0;
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}
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to += c;
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}
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};
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// thorw an exception when an IO error occurs
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inputStream.exceptions(ios_base::failbit | ios_base::badbit);
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// parse the file char by char
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try {
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while(inputStream.get(c)) {
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switch(state) {
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case Init:
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switch(c) {
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case '\n':
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break;
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case '#':
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state = Comment;
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break;
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case '=':
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whitespace = 0;
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state = Value;
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break;
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case '[':
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scope.clear();
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state = ScopeName;
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break;
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default:
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addChar(key);
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state = Key;
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}
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break;
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case Key:
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switch(c) {
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case '\n':
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finishKeyValue();
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state = Init;
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break;
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case '#':
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finishKeyValue();
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state = Comment;
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break;
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case '=':
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whitespace = 0;
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state = Value;
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break;
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default:
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addChar(key);
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}
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break;
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case Comment:
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switch(c) {
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case '\n':
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state = Init;
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break;
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default:
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;
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}
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break;
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case ScopeName:
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switch(c) {
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case ']':
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state = Init;
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break;
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default:
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scope += c;
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}
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break;
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case Value:
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switch(c) {
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case '\n':
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finishKeyValue();
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state = Init;
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break;
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case '#':
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finishKeyValue();
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state = Comment;
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break;
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default:
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addChar(value);
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}
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break;
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}
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}
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} catch (const ios_base::failure &) {
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if(inputStream.eof()) {
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// we just reached the end of the file
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// don't forget to save the last key/value pair
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finishKeyValue();
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} else {
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throw;
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}
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}
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}
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/*!
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* \brief Write the current data to the specified \a outputStream.
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*/
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void IniFile::make(ostream &outputStream)
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{
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// thorw an exception when an IO error occurs
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outputStream.exceptions(ios_base::failbit | ios_base::badbit);
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for(const auto &scope : m_data) {
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outputStream << '[' << scope.first << ']' << '\n';
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for(const auto &field : scope.second) {
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outputStream << field.first << '=' << field.second << '\n';
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}
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outputStream << '\n';
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}
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}
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} // namespace IoUtilities
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@ -0,0 +1,55 @@
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#ifndef IOUTILITIES_INIFILE_H
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#define IOUTILITIES_INIFILE_H
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#include "../application/global.h"
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#include <map>
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namespace IoUtilities {
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class LIB_EXPORT IniFile
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{
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public:
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IniFile();
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std::map<std::string, std::multimap<std::string, std::string> > &data();
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const std::map<std::string, std::multimap<std::string, std::string> > &data() const;
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void parse(std::istream &inputStream);
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void make(std::ostream &outputStream);
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private:
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std::map<std::string, std::multimap<std::string, std::string> > m_data;
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};
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/*!
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* \brief Constructs an empty ini file.
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*/
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inline IniFile::IniFile()
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{}
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/*!
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* \brief Returns the data of the file.
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*
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* - The keys in the returned map represent the [scope name]s.
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* - The values in the returned map are maps representing "key = value"-pairs within the scope.
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* - The data might be modified an saved using the make() method.
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*/
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inline std::map<std::string, std::multimap<std::string, std::string> > &IniFile::data()
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{
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return m_data;
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}
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/*!
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* \brief Returns the data of the file.
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*
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* - The keys in the returned map represent the [scope name]s.
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* - The values in the returned map are maps representing "key = value"-pairs within the scope.
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*/
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inline const std::map<std::string, std::multimap<std::string, std::string> > &IniFile::data() const
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{
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return m_data;
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}
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} // namespace IoUtilities
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#endif // IOUTILITIES_INIFILE_H
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