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/*
* Copyright (c) 2003-2012, 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.
*/
/**
* @addtogroup expr
*/
/**
* @file parser.h
* @author John Wiegley
*
* @ingroup expr
*/
#ifndef _PARSER_H
#define _PARSER_H
#include "token.h"
#include "op.h"
namespace ledger {
class expr_t::parser_t : public noncopyable
{
mutable token_t lookahead;
mutable bool use_lookahead;
token_t& next_token(std::istream& in, const parse_flags_t& tflags,
const optional<token_t::kind_t>& expecting = none) const {
if (use_lookahead)
use_lookahead = false;
else
lookahead.next(in, tflags);
if (expecting && lookahead.kind != *expecting)
lookahead.expected(*expecting);
return lookahead;
}
#if !NO_ASSERTS
void push_token(const token_t& tok) const {
assert(&tok == &lookahead);
use_lookahead = true;
}
#else
void push_token(const token_t&) const {
use_lookahead = true;
}
#endif // !NO_ASSERTS
void push_token() const {
use_lookahead = true;
}
ptr_op_t parse_value_term(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_call_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_dot_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_unary_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_mul_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_add_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_logic_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_and_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_or_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_querycolon_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_comma_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_lambda_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_assign_expr(std::istream& in,
const parse_flags_t& flags) const;
ptr_op_t parse_value_expr(std::istream& in,
const parse_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 parse_flags_t& flags = PARSE_DEFAULT,
const optional<string>& original_string = NULL);
};
} // namespace ledger
#endif // _PARSER_H
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