138 lines
4.2 KiB
C++
138 lines
4.2 KiB
C++
/*
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* Copyright (c) 2003-2012, John Wiegley. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of New Artisans LLC nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @defgroup expr Value expressions
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*/
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/**
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* @file token.h
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* @author John Wiegley
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*
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* @ingroup expr
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*/
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#ifndef _TOKEN_H
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#define _TOKEN_H
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#include "expr.h"
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namespace ledger {
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struct expr_t::token_t : public noncopyable
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{
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enum kind_t {
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ERROR, // an error occurred while tokenizing
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VALUE, // any kind of literal value
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IDENT, // [A-Za-z_][-A-Za-z0-9_:]*
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MASK, // /regexp/
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LPAREN, // (
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RPAREN, // )
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LBRACE, // {
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RBRACE, // }
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EQUAL, // ==
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NEQUAL, // !=
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LESS, // <
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LESSEQ, // <=
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GREATER, // >
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GREATEREQ, // >=
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ASSIGN, // =
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MATCH, // =~
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NMATCH, // !~
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MINUS, // -
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PLUS, // +
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STAR, // *
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SLASH, // /
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ARROW, // ->
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KW_DIV, // div
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EXCLAM, // !, not
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KW_AND, // &, &&, and
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KW_OR, // |, ||, or
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KW_MOD, // %
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KW_IF, // if
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KW_ELSE, // else
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QUERY, // ?
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COLON, // :
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DOT, // .
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COMMA, // ,
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SEMI, // ;
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TOK_EOF,
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UNKNOWN
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} kind;
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char symbol[6];
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value_t value;
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std::size_t length;
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explicit token_t() : kind(UNKNOWN), length(0) {
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TRACE_CTOR(expr_t::token_t, "");
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}
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~token_t() throw() {
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TRACE_DTOR(expr_t::token_t);
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}
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token_t& operator=(const token_t& other) {
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if (&other == this)
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return *this;
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assert(false); // only one token object is used at a time
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return *this;
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}
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void clear() {
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kind = UNKNOWN;
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length = 0;
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value = NULL_VALUE;
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symbol[0] = '\0';
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}
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int parse_reserved_word(std::istream& in);
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void parse_ident(std::istream& in);
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void next(std::istream& in, const parse_flags_t& flags);
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void rewind(std::istream& in);
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void unexpected(const char wanted = '\0');
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void expected(const char wanted, const char c = '\0');
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void expected(const kind_t wanted);
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};
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std::ostream& operator<<(std::ostream& out, const expr_t::token_t::kind_t& kind);
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std::ostream& operator<<(std::ostream& out, const expr_t::token_t& token);
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} // namespace ledger
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#endif // _TOKEN_H
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