mirror of https://gitlab.com/rnger/amath
107 lines
3.2 KiB
C++
107 lines
3.2 KiB
C++
/*-
|
|
* Copyright (c) 2014-2021 Carsten Sonne Larsen <cs@innolan.net>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* Project homepage:
|
|
* https://amath.innolan.net
|
|
*
|
|
*/
|
|
|
|
#ifndef AMATH_PARSER_H
|
|
#define AMATH_PARSER_H
|
|
|
|
/**
|
|
* @file parser.h
|
|
* @brief Application logic tied to Parser.
|
|
*
|
|
*/
|
|
|
|
#include "nodes.h"
|
|
#include "lexer.h"
|
|
|
|
/**
|
|
* @brief Encapsulates a recursive descent parser.
|
|
* @details
|
|
* More info on recursive descent parsers is available at Wikipedia:
|
|
* https://wikipedia.org/wiki/Recursive_descent_parser
|
|
*
|
|
*/
|
|
class Parser
|
|
{
|
|
public:
|
|
explicit Parser(const char* input);
|
|
~Parser();
|
|
|
|
/**
|
|
* @brief Do not include expression string in evaluation result.
|
|
*/
|
|
bool ResultOnly;
|
|
|
|
/**
|
|
* @brief Parses the input into a syntax tree.
|
|
*
|
|
* @return SyntaxNode* representing a pointer to the top node of the tree.
|
|
* Notice: The caller is responsible for releasing memory.
|
|
*
|
|
*/
|
|
SyntaxNode* Parse(); // Clang ns_returns_retained
|
|
|
|
private:
|
|
Lexer* lexer;
|
|
Token* token;
|
|
|
|
int syntaxError;
|
|
ErrorNode* errorNode;
|
|
|
|
SyntaxNode* ParseDefault();
|
|
SyntaxNode* TryParseStatement();
|
|
SyntaxNode* ParseStatement();
|
|
SyntaxNode* ParseEvaluation();
|
|
ExpressionNode* ParseExpression();
|
|
ExpressionNode* ParseAddSubstract();
|
|
ExpressionNode* ParseFactor();
|
|
ExpressionNode* ParsePower();
|
|
ExpressionNode* ParseUnary();
|
|
ExpressionNode* ParseAtomic();
|
|
ExpressionNode* ParseIdent();
|
|
ExpressionNode* ParseNumber();
|
|
|
|
SyntaxNode* ParseFunctionDef();
|
|
SyntaxNode* ParseHelpStatement();
|
|
SyntaxNode* ParseDeleteStatement();
|
|
SyntaxNode* ParseListStatement();
|
|
SyntaxNode* ParseFileStatement();
|
|
SyntaxNode* ParseNumeralStatement();
|
|
SyntaxNode* ParseDigistStatement();
|
|
SyntaxNode* ParseDrawStatement();
|
|
SyntaxNode* ParsePromptStatement();
|
|
SyntaxNode* ParsePrefsStatement();
|
|
|
|
void GetToken();
|
|
void PutToken();
|
|
bool Expect(Symbol symbol);
|
|
Token* Peek() const;
|
|
};
|
|
|
|
#endif
|