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/*
* Copyright (c) 2003-2023, John Wiegley. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of New Artisans LLC nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @defgroup expr Value expressions
*/
/**
* @file token.h
* @author John Wiegley
*
* @ingroup expr
*/
#pragma once
#include "expr.h"
namespace ledger {
struct expr_t::token_t : public noncopyable
{
enum kind_t {
ERROR, // an error occurred while tokenizing
VALUE, // any kind of literal value
IDENT, // [A-Za-z_]+
MASK, // /regexp/
LPAREN, // (
RPAREN, // )
LBRACE, // {
RBRACE, // }
EQUAL, // ==
NEQUAL, // !=
LESS, // <
LESSEQ, // <=
GREATER, // >
GREATEREQ, // >=
ASSIGN, // =
MATCH, // =~
NMATCH, // !~
MINUS, // -
PLUS, // +
STAR, // *
SLASH, // /
ARROW, // ->
KW_DIV, // div
EXCLAM, // !, not
KW_AND, // &, &&, and
KW_OR, // |, ||, or
KW_MOD, // %
KW_IF, // if
KW_ELSE, // else
QUERY, // ?
COLON, // :
DOT, // .
COMMA, // ,
SEMI, // ;
TOK_EOF,
UNKNOWN
} kind;
char symbol[6];
value_t value;
std::size_t length;
explicit token_t() : kind(UNKNOWN), length(0) {
TRACE_CTOR(expr_t::token_t, "");
}
~token_t() throw() {
TRACE_DTOR(expr_t::token_t);
}
token_t& operator=(const token_t& other) {
if (&other == this)
return *this;
assert(false); // only one token object is used at a time
return *this;
}
void clear() {
kind = UNKNOWN;
length = 0;
value = NULL_VALUE;
symbol[0] = '\0';
}
int parse_reserved_word(std::istream& in);
void parse_ident(std::istream& in);
void next(std::istream& in, const parse_flags_t& flags);
void rewind(std::istream& in);
void unexpected(const char wanted = '\0');
void expected(const char wanted, const int c);
void expected(const kind_t wanted);
};
std::ostream& operator<<(std::ostream& out, const expr_t::token_t::kind_t& kind);
std::ostream& operator<<(std::ostream& out, const expr_t::token_t& token);
} // namespace ledger
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