268 lines
6.5 KiB
C++
268 lines
6.5 KiB
C++
/*
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* Copyright (c) 2010-2011 OTClient <https://github.com/edubart/otclient>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef TOOLS_H
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#define TOOLS_H
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#include <cstdlib>
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#include <iostream>
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#include <string>
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#include <sstream>
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#include <exception>
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#include <cxxabi.h>
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#include "types.h"
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namespace Fw {
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// read utilities for istream
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inline uint8 getU8(std::istream& in) {
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uint8 tmp;
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in.read((char*)&tmp, 1);
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return tmp;
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}
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inline uint16 getU16(std::istream& in) {
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uint16 tmp;
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in.read((char*)&tmp, 2);
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return tmp;
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}
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inline uint32 getU32(std::istream& in) {
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uint32 tmp;
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in.read((char*)&tmp, 4);
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return tmp;
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}
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/// Fill an ostream by concatenating args
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/// Usage:
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/// Fw::fill_ostream(stream, a1, a2, ..., aN);
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inline void fillOstream(std::ostringstream&) { }
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template<class T, class... Args>
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void fillOstream(std::ostringstream& stream, const T& first, const Args&... rest) {
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stream << first;
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fillOstream(stream, rest...);
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}
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/// Makes a std::string by concatenating args
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/// Usage:
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/// std::string str = Fw::mkstr(a1, a2, ..., aN);
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template<class... T>
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std::string mkstr(const T&... args) {
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std::ostringstream buf;
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fillOstream(buf, args...);
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return buf.str();
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}
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// used by dumper
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struct dump_util {
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~dump_util() { std::cout << std::endl; }
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template<class T>
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dump_util& operator<<(const T& v) {
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std::cout << v << " ";
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return *this;
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}
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};
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/// Utility for dumping variables
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/// Usage:
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/// Fw::dump << v1, v2, ..., vN;
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struct dumper {
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dumper() { }
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template<class T>
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dump_util operator<<(const T& v) const {
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dump_util d;
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d << v;
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return d;
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}
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};
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/// Utility for printing messages into stdout
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/// Usage:
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/// Fw::print(v1, v2, ..., vN);
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template<class... T>
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void print(const T&... args) {
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std::ostringstream buf;
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fillOstream(buf, args...);
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std::cout << buf.str();
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}
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/// Same as Fw::print but adds a new line at the end
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template<class... T>
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void println(const T&... args) {
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print(args...);
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std::cout << std::endl;
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}
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/// Demangle names for GNU g++ compiler
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inline std::string demangleName(const char* name) {
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size_t len;
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int status;
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std::string ret;
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char* demangled = abi::__cxa_demangle(name, 0, &len, &status);
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if(demangled) {
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ret = demangled;
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free(demangled);
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}
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return ret;
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}
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/// Returns the name of a type
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/// e.g. Fw::demangle_type<Foo*>() returns a string containing 'Foo*'
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template<typename T>
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std::string demangleType() {
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return demangleName(typeid(T).name());
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}
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/// Cast a type to another type
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/// @return whether the conversion was successful or not
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template<typename T, typename R>
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bool cast(const T& in, R& out) {
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std::stringstream ss;
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ss << in;
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ss >> out;
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return !!ss && ss.eof();
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}
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// cast a type to string
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template<typename T>
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bool cast(const T& in, std::string& out) {
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std::stringstream ss;
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ss << in;
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out = ss.str();
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return true;
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}
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// cast string to string
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template<>
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inline bool cast(const std::string& in, std::string& out) {
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out = in;
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return true;
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}
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// special cast from string to boolean
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template<>
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inline bool cast(const std::string& in, bool& b) {
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static std::string validNames[2][4] = {{"true","yes","on","1"}, {"false","no","off","0"}};
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bool ret = false;
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for(int i=0;i<4;++i) {
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if(in == validNames[0][i]) {
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b = true;
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ret = true;
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break;
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} else if(in == validNames[1][i]) {
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b = false;
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ret = true;
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break;
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}
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}
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return ret;
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}
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// special cast from boolean to string
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template<>
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inline bool cast(const bool& in, std::string& out) {
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out = (in ? "true" : "false");
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return true;
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}
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// used by safe_cast
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class BadCast : public std::bad_cast {
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public:
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virtual ~BadCast() throw() { }
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template<class T, class R>
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void setWhat() {
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m_what = mkstr("failed to cast value of type '", demangleType<T>(),
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"' to type '", demangleType<R>(), "'");
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}
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virtual const char* what() { return m_what.c_str(); }
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private:
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std::string m_what;
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};
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/// Cast a type to another type, any error throws a Fw::bad_cast_exception
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/// Usage:
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/// R r = Fw::safe_cast<R>(t);
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template<typename R, typename T>
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R safeCast(const T& t) {
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R r;
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if(!cast(t, r)) {
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BadCast e;
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e.setWhat<T,R>();
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throw e;
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}
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return r;
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}
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/// Cast a type to another type, cast errors are ignored
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/// Usage:
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/// R r = Fw::unsafe_cast<R>(t);
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template<typename R, typename T>
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R unsafeCast(const T& t, R def = R()) {
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try {
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return safeCast<R,T>(t);
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} catch(BadCast& e) {
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println("CAST ERROR: ", e.what());
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return def;
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}
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}
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template<typename T>
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std::string tostring(const T& t) {
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return unsafeCast<std::string, T>(t);
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}
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template<typename T>
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T fromstring(const std::string& str, T def = T()) {
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return unsafeCast<T, std::string>(str, def);
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}
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inline std::string dec2hex(unsigned int num) {
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std::string str;
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std::ostringstream o;
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o << std::hex << num;
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str = o.str();
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return str;
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}
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inline unsigned int hex2dec(const std::string& str) {
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unsigned int num;
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std::istringstream i(str);
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i >> std::hex >> num;
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return num;
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}
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inline std::string ip2str(uint32 ip) {
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char host[16];
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sprintf(host, "%d.%d.%d.%d", (uint8)ip, (uint8)(ip >> 8), (uint8)(ip >> 16), (uint8)(ip >> 24));
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return std::string(host);
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}
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// an empty string to use anywhere needed
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const static std::string empty_string;
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}
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// shortcut for Fw::dump
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const static Fw::dumper dump;
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#endif
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