mirror of
https://develop.openfoam.com/Development/openfoam.git
synced 2025-11-28 03:28:01 +00:00
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).
145 lines
3.7 KiB
C++
145 lines
3.7 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::scanner
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Description
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Ragel lexer/scanner interface for patch expressions.
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Note
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Ragel code generated with the ./createCode script.
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\*---------------------------------------------------------------------------*/
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#ifndef expressions_fieldExprScanner_H
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#define expressions_fieldExprScanner_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 scanner Declaration
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\*---------------------------------------------------------------------------*/
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class scanner
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{
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// Private Data
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//- Wrapped lemon parser
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parser* parser_;
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//- Ragel code state, action
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int cs, act;
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// Private Member Functions
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//- Dispatch .method to parser (if known) or Fatal
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bool dispatch_method
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(
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const parseDriver& driver_,
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word ident // Receives a copy
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) const;
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//- Dispatch identifier to parser (if possible) or Fatal
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bool dispatch_ident
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(
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const parseDriver& driver_,
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word ident // Receives a copy
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) const;
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public:
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//- Local debugging
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int debug;
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// Constructors
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//- Default construct, optionally setting debugging
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explicit scanner(bool withDebug = false)
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:
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parser_(nullptr),
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debug(fieldExpr::debug)
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{
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if (withDebug)
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{
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debug |= 4;
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}
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}
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//- Destructor, deletes parser
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~scanner();
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// Member Functions
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//- Evaluate sub-string
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bool process
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(
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const std::string& str, size_t pos, size_t len,
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parseDriver& driver_
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);
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//- Evaluate sub-string
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bool process
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(
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const std::string& str, size_t pos,
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parseDriver& driver_
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)
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{
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return process(str, pos, std::string::npos, driver_);
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}
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//- Evaluate string
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bool process(const std::string& str, parseDriver& driver_)
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{
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return process(str, 0, std::string::npos, driver_);
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}
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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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