68 lines
1.5 KiB
C++
68 lines
1.5 KiB
C++
#ifndef OBELISK_LEXER_H
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#define OBELISK_LEXER_H
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#include <string>
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namespace obelisk
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{
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class Lexer
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{
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private:
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std::string identifier_;
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double numberValue_;
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void setIdentifier(const std::string& identifier);
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void eraseIdentifier();
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void appendIdentifier(int lastChar);
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void setNumberValue(double numberValue);
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void commentLine(int* lastChar);
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public:
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enum Token
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{
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kTokenEof = -1,
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// commands
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kTokenFact = -2,
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kTokenRule = -3,
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kTokenAction = -4,
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kTokenDef = -5,
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kTokenExtern = -6,
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// primary
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kTokenIdentifier = -7,
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kTokenNumber = -8,
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kTokenString = -9
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};
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int getToken();
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const std::string& getIdentifier();
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double getNumberValue();
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};
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class LexerException : public std::exception
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{
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private:
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const std::string errorMessage_;
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public:
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LexerException() :
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errorMessage_("an unknown error ocurred")
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{
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}
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LexerException(const std::string& errorMessage) :
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errorMessage_(errorMessage)
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{
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}
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const char* what() const noexcept
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{
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return errorMessage_.c_str();
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}
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};
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} // namespace obelisk
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#endif
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