66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
/*
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Copyright (C) 1996-1997 Id Software, Inc.
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Copyright (C) 1997 Greg Lewis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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See file, 'COPYING', for details.
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*/
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#pragma once
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#include <utility>
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enum : int32_t
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{
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PARSE_NORMAL = 0,
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PARSE_SAMELINE = 1, /* Expect the next token the current line */
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PARSE_COMMENT = 2, /* If a // comment is next token, return it */
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PARSE_OPTIONAL = 4, /* Return next token on same line, or false if EOL */
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PARSE_PEEK = 8 /* Don't change parser state */
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};
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using parseflags = int32_t;
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template<typename... T>
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inline auto untie(const std::tuple<T...> &tuple)
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{
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return std::tuple<typename std::remove_reference<T>::type...>(tuple);
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}
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struct parser_t
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{
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const char *pos;
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const char *end;
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uint32_t linenum = 1;
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std::string token;
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// base constructor; accept raw start & length
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parser_t(const void *start, size_t length) : pos(reinterpret_cast<const char *>(start)), end(reinterpret_cast<const char *>(start) + length) { }
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// pull from string_view; note that the string view must live for the entire
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// duration of the parser's life time
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parser_t(const std::string_view &view) : parser_t(&view.front(), view.size()) { }
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// pull from C string; made explicit because this is error-prone
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explicit parser_t(const char *str) : parser_t(str, strlen(str)) { }
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bool parse_token(parseflags flags = PARSE_NORMAL);
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auto state() { return std::tie(pos, linenum); }
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bool at_end() const { return pos >= end; };
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};
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