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math++
reader.h
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// Math Type Library
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// $Id: reader.h,v 1.6 2002/04/20 06:35:05 cparpart Exp $
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// (This file contains the reader (parser) specific interface)
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//
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// Copyright (c) 2002 by Christian Parpart <cparpart@surakware.net>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public License
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// along with this library; see the file COPYING.LIB. If not, write to
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// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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#ifndef libmath_reader_h
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#define libmath_reader_h
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#include <math++/error.h>
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#include <string>
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namespace
math {
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template
<
class
>
class
TNode;
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class
EReadError
:
public
EMath
{
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public
:
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EReadError
(
const
std::string& AReason) :
EMath
(AReason) {}
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};
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template
<
class
T>
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class
TReader
{
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private
:
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enum
TToken {
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/* TAKE CARE : THE VALUES ARE HARD CODED */
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tkInvalid, tkEnd,
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tkNumber = 1000, tkSymbol,
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tkUnEqu, tkLess, tkGreater, tkLessEqu, tkGreaterEqu,
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tkVeryLess, tkVeryGreat,
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tkEqu =
'='
, tkComma =
','
,
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tkPlus =
'+'
, tkMinus =
'-'
, tkMul =
'*'
, tkDiv =
'/'
, tkPow =
'^'
,
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tkRndOpen =
'('
, tkRndClose =
')'
, tkBrOpen =
'['
, tkBrClose =
']'
,
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tkAngOpen =
'<'
, tkAngClose =
'>'
, tkSetOpen =
'{'
, tkSetClose =
'}'
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};
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std::string FExprStr;
// holds the current parsed expression
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std::string::size_type FPos;
// holds the current read index
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TToken FToken;
// holds current parsed token id
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T FNumber;
// holds last read number
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std::string FSymbol;
// holds last read symbol
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private
:
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TReader
(
const
std::string& AInput);
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TNode<T>
*equation(
bool
get
);
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// parses an expression (really any expression, even sub equations)
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TNode<T>
*expr(
bool
get
);
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TNode<T>
*simpleExpr(
bool
get
);
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TNode<T>
*term(
bool
get
);
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TNode<T>
*factor(
bool
get
);
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TNode<T>
*prim(
bool
get
);
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TNode<T>
*createSymbol();
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TNode<T>
*param();
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bool
eof()
const
;
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TToken nextToken();
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bool
readOperator();
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bool
readNumber();
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bool
readSymbol();
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static
std::string tok2str(TToken AToken);
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void
consume(TToken AToken);
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public
:
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static
TNode<T>
*
parse
(
const
std::string& AInput,
bool
AEquation =
false
);
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};
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}
// namespace math
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#include <math++/reader.tcc>
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#endif
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