107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
/*
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* Copyright (c) 2003-2009, 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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* @addtogroup expr
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*/
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/**
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* @file parser.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 _PARSER_H
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#define _PARSER_H
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#include "token.h"
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#include "op.h"
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namespace ledger {
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class expr_t::parser_t : public noncopyable
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{
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mutable token_t lookahead;
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mutable bool use_lookahead;
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token_t& next_token(std::istream& in, const parse_flags_t& tflags) const {
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if (use_lookahead)
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use_lookahead = false;
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else
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lookahead.next(in, tflags);
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return lookahead;
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}
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void push_token(const token_t& tok) const {
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assert(&tok == &lookahead);
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use_lookahead = true;
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}
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void push_token() const {
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use_lookahead = true;
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}
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ptr_op_t parse_value_term(std::istream& in,
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const parse_flags_t& flags) const;
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ptr_op_t parse_dot_expr(std::istream& in,
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const parse_flags_t& flags) const;
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ptr_op_t parse_unary_expr(std::istream& in,
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const parse_flags_t& flags) const;
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ptr_op_t parse_mul_expr(std::istream& in,
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const parse_flags_t& flags) const;
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ptr_op_t parse_add_expr(std::istream& in,
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const parse_flags_t& flags) const;
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ptr_op_t parse_logic_expr(std::istream& in,
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const parse_flags_t& flags) const;
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ptr_op_t parse_and_expr(std::istream& in,
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const parse_flags_t& flags) const;
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ptr_op_t parse_or_expr(std::istream& in,
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const parse_flags_t& flags) const;
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ptr_op_t parse_querycolon_expr(std::istream& in,
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const parse_flags_t& flags) const;
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ptr_op_t parse_value_expr(std::istream& in,
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const parse_flags_t& flags) const;
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public:
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parser_t() : use_lookahead(false) {
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TRACE_CTOR(parser_t, "");
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}
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~parser_t() throw() {
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TRACE_DTOR(parser_t);
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}
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ptr_op_t parse(std::istream& in,
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const parse_flags_t& flags = PARSE_DEFAULT,
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const optional<string>& original_string = NULL);
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};
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} // namespace ledger
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#endif // _PARSER_H
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