122 lines
2.1 KiB
C++
122 lines
2.1 KiB
C++
#include "lexer.h"
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#include <iostream>
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int obelisk::Lexer::getToken()
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{
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static int lastChar = ' ';
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while (isspace(lastChar))
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{
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lastChar = getchar();
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}
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if (isalpha(lastChar))
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{
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eraseIdentifier();
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appendIdentifier(lastChar);
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while (isalnum((lastChar = getchar())))
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{
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appendIdentifier(lastChar);
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}
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if (getIdentifier() == "def")
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{
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return Token::kTokenDef;
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}
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if (getIdentifier() == "extern")
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{
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return kTokenExtern;
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}
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return kTokenIdentifier;
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}
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if (isdigit(lastChar) || lastChar == '.')
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{
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std::string numberStr;
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do
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{
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numberStr += lastChar;
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lastChar = getchar();
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}
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while (isdigit(lastChar) || lastChar == '.');
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setNumberValue(strtod(numberStr.c_str(), nullptr));
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return kTokenNumber;
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}
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if (lastChar == '#')
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{
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commentLine(&lastChar);
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if (lastChar != EOF)
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{
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return getToken();
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}
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}
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else if (lastChar == '/')
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{
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lastChar = getchar();
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if (lastChar == '/')
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{
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commentLine(&lastChar);
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if (lastChar != EOF)
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{
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return getToken();
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}
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}
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}
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if (lastChar == EOF)
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{
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return kTokenEof;
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}
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int thisChar = lastChar;
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lastChar = getchar();
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return thisChar;
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}
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void obelisk::Lexer::commentLine(int* lastChar)
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{
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do
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{
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*lastChar = getchar();
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}
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while (*lastChar != EOF && *lastChar != '\n' && *lastChar != '\r');
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}
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std::string obelisk::Lexer::getIdentifier()
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{
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return identifier_;
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}
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void obelisk::Lexer::setIdentifier(const std::string identifier)
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{
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identifier_ = identifier;
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}
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void obelisk::Lexer::eraseIdentifier()
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{
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identifier_ = "";
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}
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void obelisk::Lexer::appendIdentifier(int lastChar)
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{
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identifier_ += lastChar;
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}
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double obelisk::Lexer::getNumberValue()
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{
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return numberValue_;
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}
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void obelisk::Lexer::setNumberValue(double numberValue)
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{
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numberValue_ = numberValue;
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}
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