mirror of
https://develop.openfoam.com/Development/openfoam.git
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e6697edb52
- previously simply reused the scan token, which works fine for
non-nested tokenizations but becomes too fragile with nesting.
Now changed to use tagged unions that can be copied about
and still retain some rudimentary knowledge of their types,
which can be manually triggered with a destroy() call.
- provide an 'identifier' non-terminal as an additional catch
to avoid potential leakage on parsing failure.
- adjust lemon rules and infrastructure:
- use %token to predefine standard tokens.
Will reduce some noise on the generated headers by retaining the
order on the initial token names.
- Define BIT_NOT, internal token rename NOT -> LNOT
- handle non-terminal vector values.
Support vector::x, vector::y and vector::z constants
- permit fieldExpr access to time().
Probably not usable or useful for an '#eval' expression,
but useful for a Function1.
- provisioning for hooks into function calls. Establishes token
names for next commit(s).
121 lines
3.2 KiB
C++
121 lines
3.2 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | www.openfoam.com
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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Copyright (C) 2019-2021 OpenCFD Ltd.
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::expressions::fieldExpr::parser
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Description
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Lemon parser interface for field expressions grammar
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\*---------------------------------------------------------------------------*/
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#ifndef expressions_fieldExprParser_H
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#define expressions_fieldExprParser_H
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#include "exprScanToken.H"
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#include "fieldExprFwd.H"
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namespace Foam
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{
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namespace expressions
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{
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namespace fieldExpr
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{
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/*---------------------------------------------------------------------------*\
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Class parser Declaration
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\*---------------------------------------------------------------------------*/
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class parser
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{
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// Private Data
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//- Prompt for parser tracing
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static constexpr const char* const prompt_ = "fieldExpr:";
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//- The lemon parser (demand-driven)
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void* lemon_;
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public:
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//- Local object debugging
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int debug;
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// Constructors
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//- Construct null
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parser() : lemon_(nullptr), debug(fieldExpr::debug) {}
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//- Destructor, deletes parser backend
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~parser()
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{
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stop();
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}
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// Static Member Functions
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//- Return the text name corresponding to the tokenId
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static word tokenName(int tokenId);
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//- Print all token names
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static void printTokenNames(Ostream& os);
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//- Print all rules
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static void printRules(Ostream& os);
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// Member Functions
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//- Start parsing, with the given driver context
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void start(parseDriver& driver_);
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//- Stop parsing, freeing the allocated parser
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void stop();
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//- Push token type to parser with default token
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void parse(int tokenId);
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//- Push token type/value to parser
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void parse(int tokenId, scanToken tok);
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace fieldExpr
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} // End namespace expressions
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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