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Commit 70f5a42

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copy from adp-gmbh.ch
1 parent 7a8535d commit 70f5a42

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7 files changed

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‎.gitignore‎

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*.swp

‎Chameleon.cpp‎

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/*
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Chameleon.cpp
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Copyright (C) 2002-2004 René Nyffenegger
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This source code is provided 'as-is', without any express or implied
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warranty. In no event will the author be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this source code must not be misrepresented; you must not
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claim that you wrote the original source code. If you use this source code
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original source code.
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3. This notice may not be removed or altered from any source distribution.
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René Nyffenegger rene.nyffenegger@adp-gmbh.ch
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*/
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#include <string>
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#include <sstream>
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#include "Chameleon.h"
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Chameleon::Chameleon(std::string const& value) {
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value_=value;
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}
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#include <iostream>
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Chameleon::Chameleon(const char* c) {
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value_=c;
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}
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Chameleon::Chameleon(double d) {
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std::stringstream s;
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s<<d;
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value_=s.str();
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}
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Chameleon::Chameleon(Chameleon const& other) {
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value_=other.value_;
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}
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Chameleon& Chameleon::operator=(Chameleon const& other) {
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value_=other.value_;
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return *this;
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}
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Chameleon& Chameleon::operator=(double i) {
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std::stringstream s;
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s << i;
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value_ = s.str();
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return *this;
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}
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Chameleon& Chameleon::operator=(std::string const& s) {
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value_=s;
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return *this;
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}
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Chameleon::operator std::string() const {
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return value_;
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}
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Chameleon::operator double() const {
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return atof(value_.c_str());
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}

‎Chameleon.h‎

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/*
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Chameleon.h
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Copyright (C) 2002-2004 René Nyffenegger
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This source code is provided 'as-is', without any express or implied
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warranty. In no event will the author be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this source code must not be misrepresented; you must not
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claim that you wrote the original source code. If you use this source code
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original source code.
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3. This notice may not be removed or altered from any source distribution.
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René Nyffenegger rene.nyffenegger@adp-gmbh.ch
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*/
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#ifndef CHAMELEON_H__
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#define CHAMELEON_H__
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#include <string>
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class Chameleon {
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public:
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Chameleon() {};
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explicit Chameleon(const std::string&);
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explicit Chameleon(double);
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explicit Chameleon(const char*);
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Chameleon(const Chameleon&);
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Chameleon& operator=(Chameleon const&);
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Chameleon& operator=(double);
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Chameleon& operator=(std::string const&);
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public:
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operator std::string() const;
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operator double () const;
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private:
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std::string value_;
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};
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#endif

‎ConfigFile.cpp‎

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#include "ConfigFile.h"
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#include <fstream>
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std::string trim(std::string const& source, char const* delims = " \t\r\n") {
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std::string result(source);
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std::string::size_type index = result.find_last_not_of(delims);
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if(index != std::string::npos)
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result.erase(++index);
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index = result.find_first_not_of(delims);
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if(index != std::string::npos)
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result.erase(0, index);
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else
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result.erase();
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return result;
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}
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ConfigFile::ConfigFile(std::string const& configFile) {
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std::ifstream file(configFile.c_str());
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std::string line;
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std::string name;
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std::string value;
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std::string inSection;
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int posEqual;
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while (std::getline(file,line)) {
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if (! line.length()) continue;
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if (line[0] == '#') continue;
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if (line[0] == ';') continue;
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if (line[0] == '[') {
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inSection=trim(line.substr(1,line.find(']')-1));
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continue;
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}
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posEqual=line.find('=');
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name = trim(line.substr(0,posEqual));
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value = trim(line.substr(posEqual+1));
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content_[inSection+'/'+name]=Chameleon(value);
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}
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}
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Chameleon const& ConfigFile::Value(std::string const& section, std::string const& entry) const {
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std::map<std::string,Chameleon>::const_iterator ci = content_.find(section + '/' + entry);
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if (ci == content_.end()) throw "does not exist";
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return ci->second;
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}
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Chameleon const& ConfigFile::Value(std::string const& section, std::string const& entry, double value) {
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try {
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return Value(section, entry);
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} catch(const char *) {
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return content_.insert(std::make_pair(section+'/'+entry, Chameleon(value))).first->second;
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}
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}
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Chameleon const& ConfigFile::Value(std::string const& section, std::string const& entry, std::string const& value) {
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try {
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return Value(section, entry);
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} catch(const char *) {
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return content_.insert(std::make_pair(section+'/'+entry, Chameleon(value))).first->second;
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}
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}

‎ConfigFile.h‎

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#ifndef __CONFIG_FILE_H__
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#define __CONFIG_FILE_H__
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#include <string>
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#include <map>
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#include "Chameleon.h"
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class ConfigFile {
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std::map<std::string,Chameleon> content_;
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public:
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ConfigFile(std::string const& configFile);
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Chameleon const& Value(std::string const& section, std::string const& entry) const;
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Chameleon const& Value(std::string const& section, std::string const& entry, double value);
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Chameleon const& Value(std::string const& section, std::string const& entry, std::string const& value);
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};
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#endif

‎test/config.txt‎

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[section_1]
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foo = bar
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water= h2o
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[section_2]
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foo = foo
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water= wet
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four = 4.2

‎test/read-config.txt.cpp‎

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//
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// g++ ../ConfigFile.cpp ../Chameleon.cpp read-config.txt.cpp -o read-config.txt
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//
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#include "../ConfigFile.h"
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#include <iostream>
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int main() {
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ConfigFile cf("config.txt");
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std::string foo;
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std::string water;
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double four;
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foo = cf.Value("section_1","foo" );
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water = cf.Value("section_2","water");
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four = cf.Value("section_2","four" );
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std::cout << foo << std::endl;
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std::cout << water << std::endl;
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std::cout << four << std::endl;
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return 0;
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}

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