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			75 lines
		
	
	
	
		
			1.8 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
			
		
		
	
	
			75 lines
		
	
	
	
		
			1.8 KiB
		
	
	
	
		
			C++
		
	
	
	
	
	
#ifndef OPENMW_COMPONENTS_FX_LEXER_H
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#define OPENMW_COMPONENTS_FX_LEXER_H
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#include <string_view>
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#include <string>
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#include <variant>
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#include <optional>
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#include <cstdint>
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#include <stdexcept>
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#include <osg/Vec2f>
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#include <osg/Vec3f>
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#include <osg/Vec4f>
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#include "lexer_types.hpp"
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namespace fx
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{
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    namespace Lexer
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    {
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        struct LexerException : std::runtime_error
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        {
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            LexerException(const std::string& message) : std::runtime_error(message) {}
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            LexerException(const char* message) : std::runtime_error(message) {}
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        };
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        class Lexer
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        {
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        public:
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            struct Block
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            {
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                int line;
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                std::string_view content;
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            };
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            Lexer(std::string_view buffer);
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            Lexer() = delete;
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            Token next();
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            Token peek();
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            // Jump ahead to next uncommented closing bracket at level zero. Assumes the head is at an opening bracket.
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            // Returns the contents of the block excluding the brackets and places cursor at closing bracket.
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            std::optional<std::string_view> jump();
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            Block getLastJumpBlock() const;
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            [[noreturn]] void error(const std::string& msg);
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        private:
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            void drop();
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            void advance();
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            char head();
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            bool peekChar(char c);
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            Token scanToken();
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            Token scanLiteral();
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            Token scanStringLiteral();
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            Token scanNumber();
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            const char* mHead;
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            const char* mTail;
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            std::size_t mAbsolutePos;
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            std::size_t mColumn;
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            std::size_t mLine;
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            std::string_view mBuffer;
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            Token mLastToken;
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            std::optional<Token> mLookahead;
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            Block mLastJumpBlock;
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        };
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    }
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}
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#endif
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