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#include <algorithm>
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include "preprocessor.hpp"
#include "filesystem.hpp"
std::string preprocess(const std::string& input){
std::string output_string;
std::string::const_iterator i = input.begin();
while(i != input.end()){
//std::cerr << "test";
if(*i == '@'){
// process pre-processing directive here. See what comes after the '@' and do something appropriate
static const std::string IncludeString = "@include";
if(input.end() - i > IncludeString.size() && std::equal(IncludeString.begin(), IncludeString.end(), i)) {
std::string filename_string;
i += IncludeString.size(); //skip past the directive - we've tested that it exists
//test for an argument to @include - e.g. "filename.cfg". First the open quote:
std::string::const_iterator quote = std::find(i, input.end(), '"');
if(quote == input.end()) {
std::cerr << "we didn't find a opening quote. Syntax error." << std::endl;
}
if(std::count_if(i, quote, isspace) != quote - i) {
// # of whitespaces != number of intervening chars => something else was present. Syntax Error.
std::cerr << "# of whitespaces != number of intervening chars." << std::endl;
}
i = quote + 1; //we've found a quote, advance past it
//now the closing quote, and use it to find what's inbetween:
std::string::const_iterator endQuote = std::find(i, input.end(), '"');
if(endQuote == input.end()) {
std::cerr << "we didn't find a closing quote. Syntax error." << std::endl;
}
filename_string = std::string(i, endQuote);
i = endQuote + 1;
output_string += preprocess(sys::read_file(filename_string));
}
} else {
//nothing special to process, just copy the chars across
output_string.push_back(*i);
}
++i;
}
return output_string;
}
#ifdef BUILD_PREPROCESSOR_TOOL
extern "C" int main(int argc, char** argv)
{
for(int i = 1; i < argc; ++i) {
std::ifstream file(argv[i], std::ios_base::binary);
std::stringstream ss;
ss << file.rdbuf();
std::cout << preprocess(ss.str());
}
}
#endif
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