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82 lines
2.4 KiB
82 lines
2.4 KiB
//
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// brainfuck.hpp
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//
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// Created by Joshua Moerman on 05/22/11.
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// Copyright 2011 Vadovas. All rights reserved.
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//
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/*
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T is the memory-type (normally bytes aka char)
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OutputIterator is where to write (normally cout)
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*/
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#ifndef BRAINFUCK_HPP
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#define BRAINFUCK_HPP
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#include <iostream>
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#include <iterator>
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#include <algorithm>
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namespace brainfuck_details {
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// recursive funtion (from http://www.xs4all.nl/~weegen/eelis/geordi/) but templated
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template <typename T, typename InputIterator, typename OutputIterator>
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void b(char * c, InputIterator& in, T * & p, OutputIterator out){
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for(; *c && *c != ']'; ++c) {
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switch(*c){
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case '>' : ++p; break;
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case '<' : --p; break;
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case '+' : ++*p; break;
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case '-' : --*p; break;
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case '.' : *out++ = *p; break;
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case ',' : *p = *in++; break;
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case '[' :
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for(++c; *p;) b(c, in, p, out);
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for(int d = 0; *c!=']' || d--; ++c) if(*c == '[') d++;
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break;
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}
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}
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}
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// normally we want a comma between values
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template <typename T>
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std::ostream_iterator<T> default_ostream_iterator(std::ostream& os = std::cout){
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return std::ostream_iterator<T>(os, ", ");
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}
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// except for char's
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template <>
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std::ostream_iterator<char> default_ostream_iterator<char>(std::ostream& os){
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return std::ostream_iterator<char>(os);
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}
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}
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// Would be better if we used a smarter iterator for p... it is of fixed size now :(
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template <typename T = char, typename OutputIterator = std::ostream_iterator<T>>
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void brainfuck(std::string prg, std::basic_string<T> inp = std::basic_string<T>(), OutputIterator it = brainfuck_details::default_ostream_iterator<T>()) {
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char * c = new char[prg.length() + 1];
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std::copy(prg.begin(), prg.end(), c);
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T * i = new T[inp.length() + 1];
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std::copy(inp.begin(), inp.end(), i);
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T * p = new T[512];
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std::fill_n(p, 512, T(0));
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brainfuck_details::b(c,i,p,it);
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}
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// we can't put a default on the InputIterator, because that would be ambigious
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template <typename T = char, typename InputIterator = std::istream_iterator<T>, typename OutputIterator = std::ostream_iterator<T>>
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void brainfuck(std::string prg, InputIterator inp, OutputIterator it = brainfuck_details::default_ostream_iterator<T>()) {
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char * c = new char[prg.length() + 1];
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std::copy(prg.begin(), prg.end(), c);
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T * p = new T[512];
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std::fill_n(p, 512, T(0));
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brainfuck_details::b(c,inp,p,it);
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}
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#endif // BRAINFUCK_HPP
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