mirror of https://gitlab.com/rnger/amath
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/*
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* Copyright (c) 2015-2017 Carsten Sonne Larsen <cs@innolan.dk>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef _LEXER_H
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#define _LEXER_H
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/**
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* @file lexer.h
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* @brief Application logic tied to Lexer.
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*
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*/
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#include "main/token.h"
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/**
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* @brief Encapsulates an lexical analyzer. Provides token for the parser.
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*
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* More info on lexical analysis is available at Wikipedia:
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* http://en.wikipedia.org/wiki/Lexical_analysis
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*
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*/
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class Lexer {
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public:
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Lexer(const char *input);
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~Lexer();
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void Tokenize();
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Token* GetFirstToken();
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char* GetInput();
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static char* FindKeyword(Symbol symbol);
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private:
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char *input; // Input to process by lexer
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char *str; // Pointer to char being processed
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unsigned int pos;
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Token* first;
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Token* current;
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void GetNextToken();
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bool GetOperator();
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bool GetQuotedIdent();
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bool GetLitteral();
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bool GetDigitValue();
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bool ShouldSkip(char character);
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Symbol FindKeyword(const char *ident);
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};
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#endif
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