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/*
* Copyright (c) 2003-2008, 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.
*/
#ifndef _PARSER_H
#define _PARSER_H
#include "token.h"
#include "op.h"
namespace ledger {
class expr_t::parser_t : public noncopyable
{
#define EXPR_PARSE_NORMAL 0x00
#define EXPR_PARSE_PARTIAL 0x01
#define EXPR_PARSE_NO_MIGRATE 0x02
#define EXPR_PARSE_NO_REDUCE 0x04
#define EXPR_PARSE_NO_ASSIGN 0x08
#define EXPR_PARSE_NO_DATES 0x10
public:
typedef uint_least8_t flags_t;
private:
mutable token_t lookahead;
mutable bool use_lookahead;
token_t& next_token(std::istream& in, flags_t tflags) const
{
if (use_lookahead)
use_lookahead = false;
else
lookahead.next(in, tflags);
return lookahead;
}
void push_token(const token_t& tok) const
{
assert(&tok == &lookahead);
use_lookahead = true;
}
void push_token() const
{
use_lookahead = true;
}
ptr_op_t parse_value_term(std::istream& in, const flags_t flags) const;
ptr_op_t parse_unary_expr(std::istream& in, const flags_t flags) const;
ptr_op_t parse_mul_expr(std::istream& in, const flags_t flags) const;
ptr_op_t parse_add_expr(std::istream& in, const flags_t flags) const;
ptr_op_t parse_logic_expr(std::istream& in, const flags_t flags) const;
ptr_op_t parse_and_expr(std::istream& in, const flags_t flags) const;
ptr_op_t parse_or_expr(std::istream& in, const flags_t flags) const;
ptr_op_t parse_querycolon_expr(std::istream& in, const flags_t flags) const;
ptr_op_t parse_value_expr(std::istream& in, const flags_t flags) const;
public:
parser_t() : use_lookahead(false) {
TRACE_CTOR(parser_t, "");
}
~parser_t() throw() {
TRACE_DTOR(parser_t);
}
ptr_op_t parse(std::istream& in, const flags_t flags = EXPR_PARSE_NORMAL);
ptr_op_t parse(string& str, const flags_t flags = EXPR_PARSE_NORMAL) {
std::istringstream stream(str);
return parse(stream, flags);
}
};
} // namespace ledger
#endif // _PARSER_H
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