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bbf1737cc2
- to compensate for the slower parser, optimised it a little - change basic_string to fray, a refcounted immutable string - add 'xml' tool, prints the parser tree in XML
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*
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* Copyright (c) 2008 Andrew Garrett.
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* Copyright (c) 2008 River Tarnell <river@wikimedia.org>
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* Derived from public domain code contributed by Victor Vasiliev.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely. This software is provided 'as-is', without any express or
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* implied warranty.
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*/
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#include <iostream>
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#include "parser.h"
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#include "afstring.h"
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template<typename charT>
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afp::basic_datum<charT>
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f_add(std::vector<afp::basic_datum<charT> > const &args)
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{
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return args[0] + args[1];
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}
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template<typename charT>
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afp::basic_datum<charT>
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f_norm(std::vector<afp::basic_datum<charT> > const &args)
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{
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return args[0];
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}
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template<typename charT>
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afp::basic_datum<charT>
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f_length(std::vector<afp::basic_datum<charT> > const &args)
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{
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return afp::basic_datum<charT>::from_int(args[0].toString().size());
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}
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int
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main(int argc, char **argv)
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{
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if (argc != 2) {
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std::cerr << boost::format("usage: %s <expr>\n")
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% argv[0];
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return 1;
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}
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afp::u32expressor e;
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e.add_variable(make_u32fray("ONE"), afp::u32datum::from_int(1));
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e.add_variable(make_u32fray("TWO"), afp::u32datum::from_int(2));
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e.add_variable(make_u32fray("THREE"), afp::u32datum::from_int(3));
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e.add_function(make_u32fray("add"), f_add<UChar32>);
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e.add_function(make_u32fray("norm"), f_norm<UChar32>);
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e.add_function(make_u32fray("length"), f_length<UChar32>);
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try {
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std::cout << make_u8fray(e.evaluate(make_u32fray(argv[1])).toString()) << '\n';
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} catch (std::exception &e) {
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std::cout << "parsing failed: " << e.what() << '\n';
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}
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}
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