78 lines
4.1 KiB
C++
78 lines
4.1 KiB
C++
#ifndef LEPTON_PARSER_H_
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#define LEPTON_PARSER_H_
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/* -------------------------------------------------------------------------- *
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* Lepton *
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* -------------------------------------------------------------------------- *
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* This is part of the Lepton expression parser originating from *
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* Simbios, the NIH National Center for Physics-Based Simulation of *
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* Biological Structures at Stanford, funded under the NIH Roadmap for *
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* Medical Research, grant U54 GM072970. See https://simtk.org. *
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* *
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* Portions copyright (c) 2009 Stanford University and the Authors. *
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* Authors: Peter Eastman *
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* Contributors: *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the "Software"), *
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* to deal in the Software without restriction, including without limitation *
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, *
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* and/or sell copies of the Software, and to permit persons to whom the *
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* Software is furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included in *
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* all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, *
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL *
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* THE AUTHORS, CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE *
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* USE OR OTHER DEALINGS IN THE SOFTWARE. *
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* -------------------------------------------------------------------------- */
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#include "windowsIncludes.h"
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#include <map>
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#include <string>
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#include <vector>
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namespace Lepton {
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class CustomFunction;
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class ExpressionTreeNode;
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class Operation;
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class ParsedExpression;
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class ParseToken;
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/**
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* This class provides the main interface for parsing expressions.
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*/
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class LEPTON_EXPORT Parser {
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public:
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/**
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* Parse a mathematical expression and return a representation of it as an abstract syntax tree.
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*/
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static ParsedExpression parse(const std::string& expression);
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/**
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* Parse a mathematical expression and return a representation of it as an abstract syntax tree.
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*
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* @param customFunctions a map specifying user defined functions that may appear in the expression.
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* The key are function names, and the values are corresponding CustomFunction objects.
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*/
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static ParsedExpression parse(const std::string& expression, const std::map<std::string, CustomFunction*>& customFunctions);
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private:
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static std::string trim(const std::string& expression);
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static std::vector<ParseToken> tokenize(const std::string& expression);
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static ParseToken getNextToken(const std::string& expression, int start);
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static ExpressionTreeNode parsePrecedence(const std::vector<ParseToken>& tokens, int& pos, const std::map<std::string, CustomFunction*>& customFunctions,
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const std::map<std::string, ExpressionTreeNode>& subexpressionDefs, int precedence);
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static Operation* getOperatorOperation(const std::string& name);
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static Operation* getFunctionOperation(const std::string& name, const std::map<std::string, CustomFunction*>& customFunctions);
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};
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} // namespace Lepton
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#endif /*LEPTON_PARSER_H_*/
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