68 lines
1.9 KiB
C++
68 lines
1.9 KiB
C++
#ifndef AOCPP_PARSING_HPP_
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#define AOCPP_PARSING_HPP_
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#include <string>
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#include <iostream>
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#include <iterator>
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#include <vector>
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#include <boost/spirit/home/qi.hpp>
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namespace aocpp {
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auto SplitOn(std::string const& stuff, std::string const& sep) -> std::vector<std::string>;
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/// Parse the complete input stream according to the rules defined in 'Grammar'.
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/// Throws: std::runtime_error on failed parse
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template <typename G>
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auto ParseGrammar(G const& grammar, std::istream & in) -> typename G::start_type::attr_type
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{
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namespace qi = boost::spirit::qi;
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auto result = typename G::start_type::attr_type {};
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auto const content = std::string{std::istreambuf_iterator{in}, {}};
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auto b = content.begin(); // updated on successful parse
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auto const e = content.end();
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if (!qi::parse(b, e, grammar, result) || b != e) {
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throw std::runtime_error{"Bad input file: " + content};
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}
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return result;
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}
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template <typename G>
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auto ParseGrammar_(G const& grammar, std::istream & in) -> typename G::start_type::attr_type
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{
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namespace qi = boost::spirit::qi;
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auto result = typename G::start_type::attr_type {};
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auto const content = std::string{std::istreambuf_iterator{in}, {}};
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auto b = content.begin(); // updated on successful parse
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auto const e = content.end();
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if (!qi::phrase_parse(b, e, grammar, qi::ascii::space, result) || b != e) {
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throw std::runtime_error{"Bad input file: " + content};
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}
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return result;
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}
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template <typename R>
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auto ParseSimple(std::istream& in, auto p) -> R
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{
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R result;
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namespace qi = boost::spirit::qi;
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auto const content = std::string{std::istreambuf_iterator{in}, {}};
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qi::rule<std::string::const_iterator, R()> r { std::move(p) };
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auto it = content.begin();
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auto const end = content.end();
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bool success = qi::parse(it, end, r, result);
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if (!success || it != end) {
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throw std::runtime_error("Parsing failed or input was not fully consumed.");
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}
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return result;
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}
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}
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#endif
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