103 lines
3.0 KiB
C++
103 lines
3.0 KiB
C++
/* This file is part of the Pangolin Project.
|
|
* http://github.com/stevenlovegrove/Pangolin
|
|
*
|
|
* Copyright (c) 2014 Steven Lovegrove
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person
|
|
* obtaining a copy of this software and associated documentation
|
|
* files (the "Software"), to deal in the Software without
|
|
* restriction, including without limitation the rights to use,
|
|
* copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the
|
|
* Software is furnished to do so, subject to the following
|
|
* conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be
|
|
* included in all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
|
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
|
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
|
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
|
* OTHER DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <ostream>
|
|
#include <functional>
|
|
|
|
namespace pangolin
|
|
{
|
|
|
|
// Find the open brace preceeded by '$'
|
|
inline const char* FirstOpenBrace(const char* str, char token = '$', char open = '{')
|
|
{
|
|
bool symbol = false;
|
|
|
|
for(; *str != '\0'; ++str ) {
|
|
if( *str == token) {
|
|
symbol = true;
|
|
}else{
|
|
if( symbol ) {
|
|
if( *str == open ) {
|
|
return str;
|
|
} else {
|
|
symbol = false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// Find the first matching end brace. str includes open brace
|
|
inline const char* MatchingEndBrace(const char* str, char open = '{', char close = '}')
|
|
{
|
|
int b = 0;
|
|
for(; *str != '\0'; ++str ) {
|
|
if( *str == open ) {
|
|
++b;
|
|
}else if( *str == close ) {
|
|
--b;
|
|
if( b == 0 ) {
|
|
return str;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
inline std::string Transform(const std::string& val, std::function<std::string(const std::string&)> dictionary, char token = '$', char open = '{', char close = '}')
|
|
{
|
|
std::string expanded = val;
|
|
|
|
while(true)
|
|
{
|
|
const char* brace = FirstOpenBrace(expanded.c_str(), token, open);
|
|
if(brace)
|
|
{
|
|
const char* endbrace = MatchingEndBrace(brace);
|
|
if( endbrace )
|
|
{
|
|
std::ostringstream oss;
|
|
oss << std::string(expanded.c_str(), brace-1);
|
|
|
|
const std::string inexpand = Transform( std::string(brace+1,endbrace), dictionary, token, open, close );
|
|
oss << dictionary(inexpand);
|
|
oss << std::string(endbrace+1, expanded.c_str() + expanded.length() );
|
|
expanded = oss.str();
|
|
continue;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
return expanded;
|
|
}
|
|
|
|
}
|