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Lexer.cpp
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//
// Created by Nalley on 2017/7/27.
//
#include <iostream>
#include "Lexer.h"
using std::string;
Lexer::Lexer()
: mColumn(0)
, mNumLine(0)
{
}
std::vector<Token> Lexer::getTokens()
{
return mTokens;
}
void Lexer::runLexer(const std::string &input)
{
clear();
auto nowState = State::INIT;
string nowStr = "";
auto lastLine = mNumLine;
auto lastColumn = mColumn;
for(auto i = 0; i < input.length() + 1; i++)
{
char ch = ( i== input.length() ) ? '\0' : input.at(i) ;
CharType cht;
try
{
cht = charType( ch );
}
catch ( std::invalid_argument & e)
{
error(e.what());
}
catch (...)
{
error("unkown error");
}
auto outPair = mLexerTable.at(std::make_pair(nowState, cht));
if ( outPair.second == TokenType::BAD_TOKEN )
{
error("bad token !");
}
else if ( outPair.second != TokenType::NO_TOKEN )
{
mTokens.emplace_back(Token{outPair.second, nowStr, lastLine + 1, lastColumn - nowStr.length() + 2});
nowStr = "";
}
if ( ch != ' ')
{
nowStr.push_back(ch);
}
nowState = outPair.first;
lastLine = mNumLine;
lastColumn = mColumn;
updatePosition(nowState);
}
mTokens.emplace_back(Token{TokenType::ENDL, "", 0, 0});
}
void Lexer::updatePosition(const State &nowState)
{
mColumn++;
if ( nowState == State::ENDL )
{
mNumLine++;
mColumn = 0;
}
}
/*
std::vector<string> Lexer::getTokens()
{
}
*/
void Lexer::clear()
{
mColumn = 0;
mNumLine = 0;
}
CharType Lexer::charType(char ch)
{
switch(ch)
{
case '\0' : return CharType::END;
case ' ' : return CharType::SPACE;
case '\n' : return CharType::ENDL;
case '+' : return CharType::ADD;
case '-' : return CharType::SUB;
case '*' : return CharType::MUL;
case '/' : return CharType::DIV;
case '(' : return CharType::LP;
case ')' : return CharType::RP;
case '.' : return CharType::POINT;
case '=' : return CharType::ASN;
default :
{
if ('0' <= ch and ch <= '9')
{
return CharType::NUM;
}
if ( ('a' <= ch and ch <= 'z')
or ('A' <= ch and ch <= 'Z') )
{
return CharType::WORD;
}
else
{
string info = "char ";
info += ch;
info += " is unacceptable";
throw std::invalid_argument(info);
}
}
}
}
void Lexer::error(const std::string &info)
{
std::cerr << "on line " << mNumLine + 1 << ", column " << mColumn + 1 << ":\n";
std::cerr << info << '\n';
exit(1);
}
const std::unordered_map< Lexer::MapInType, Lexer::MapOUtType, pair_hash > Lexer::mLexerTable{
/* init */
{ {State::INIT, CharType::END}, {State::OVER, TokenType::NO_TOKEN}},
{ {State::INIT, CharType::SPACE}, {State::INIT, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::ENDL}, {State::ENDL, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::ADD}, {State::ADD, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::SUB}, {State::SUB, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::MUL}, {State::MUL, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::DIV}, {State::DIV, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::LP}, {State::LP, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::RP}, {State::RP, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::NUM}, {State::NUM_INT, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::POINT}, {State::POINT_FNT, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::WORD}, {State::VAR, TokenType::NO_TOKEN} },
{ {State::INIT, CharType::ASN}, {State::ASN, TokenType::NO_TOKEN} },
/* add */
{ {State::ADD, CharType::END}, {State::OVER, TokenType::ADD} },
{ {State::ADD, CharType::SPACE}, {State::INIT, TokenType::ADD} },
{ {State::ADD, CharType::ENDL}, {State::ENDL, TokenType::ADD} },
{ {State::ADD, CharType::ADD}, {State::ADD, TokenType::ADD} },
{ {State::ADD, CharType::SUB}, {State::SUB, TokenType::ADD} },
{ {State::ADD, CharType::MUL}, {State::MUL, TokenType::ADD} },
{ {State::ADD, CharType::DIV}, {State::DIV, TokenType::ADD} },
{ {State::ADD, CharType::LP}, {State::LP, TokenType::ADD} },
{ {State::ADD, CharType::RP}, {State::RP, TokenType::ADD} },
{ {State::ADD, CharType::NUM}, {State::NUM_INT, TokenType::ADD} },
{ {State::ADD, CharType::POINT}, {State::POINT_FNT, TokenType::ADD} },
{ {State::ADD, CharType::WORD}, {State::VAR, TokenType::ADD} },
{ {State::ADD, CharType::ASN}, {State::ASN, TokenType::ADD} },
/* sub */
{ {State::SUB, CharType::END}, {State::OVER, TokenType::SUB} },
{ {State::SUB, CharType::SPACE}, {State::INIT, TokenType::SUB} },
{ {State::SUB, CharType::ENDL}, {State::ENDL, TokenType::SUB} },
{ {State::SUB, CharType::ADD}, {State::ADD, TokenType::SUB} },
{ {State::SUB, CharType::SUB}, {State::SUB, TokenType::SUB} },
{ {State::SUB, CharType::MUL}, {State::MUL, TokenType::SUB} },
{ {State::SUB, CharType::DIV}, {State::DIV, TokenType::SUB} },
{ {State::SUB, CharType::LP}, {State::LP, TokenType::SUB} },
{ {State::SUB, CharType::RP}, {State::RP, TokenType::SUB} },
{ {State::SUB, CharType::NUM}, {State::NUM_INT, TokenType::SUB} },
{ {State::SUB, CharType::POINT}, {State::POINT_FNT, TokenType::SUB} },
{ {State::SUB, CharType::WORD}, {State::VAR, TokenType::SUB} },
{ {State::SUB, CharType::ASN}, {State::ASN, TokenType::SUB} },
/* mul */
{ {State::MUL, CharType::END}, {State::OVER, TokenType::MUL} },
{ {State::MUL, CharType::SPACE}, {State::INIT, TokenType::MUL} },
{ {State::MUL, CharType::ENDL}, {State::ENDL, TokenType::MUL} },
{ {State::MUL, CharType::ADD}, {State::ADD, TokenType::MUL} },
{ {State::MUL, CharType::SUB}, {State::SUB, TokenType::MUL} },
{ {State::MUL, CharType::MUL}, {State::MUL, TokenType::MUL} },
{ {State::MUL, CharType::DIV}, {State::DIV, TokenType::MUL} },
{ {State::MUL, CharType::LP}, {State::LP, TokenType::MUL} },
{ {State::MUL, CharType::RP}, {State::RP, TokenType::MUL} },
{ {State::MUL, CharType::NUM}, {State::NUM_INT, TokenType::MUL} },
{ {State::MUL, CharType::POINT}, {State::POINT_FNT, TokenType::MUL} },
{ {State::MUL, CharType::WORD}, {State::VAR, TokenType::MUL} },
{ {State::MUL, CharType::ASN}, {State::ASN, TokenType::MUL} },
/* div */
{ {State::DIV, CharType::END}, {State::OVER, TokenType::DIV} },
{ {State::DIV, CharType::SPACE}, {State::INIT, TokenType::DIV} },
{ {State::DIV, CharType::ENDL}, {State::ENDL, TokenType::DIV} },
{ {State::DIV, CharType::ADD}, {State::ADD, TokenType::DIV} },
{ {State::DIV, CharType::SUB}, {State::SUB, TokenType::DIV} },
{ {State::DIV, CharType::MUL}, {State::MUL, TokenType::DIV} },
{ {State::DIV, CharType::DIV}, {State::DIV, TokenType::DIV} },
{ {State::DIV, CharType::LP}, {State::LP, TokenType::DIV} },
{ {State::DIV, CharType::RP}, {State::RP, TokenType::DIV} },
{ {State::DIV, CharType::NUM}, {State::NUM_INT, TokenType::DIV} },
{ {State::DIV, CharType::POINT}, {State::POINT_FNT, TokenType::DIV} },
{ {State::DIV, CharType::WORD}, {State::VAR, TokenType::DIV} },
{ {State::DIV, CharType::ASN}, {State::ASN, TokenType::DIV} },
/* left par */
{ {State::LP, CharType::END}, {State::OVER, TokenType::LEFT_PAR} },
{ {State::LP, CharType::SPACE}, {State::INIT, TokenType::LEFT_PAR} },
{ {State::LP, CharType::ENDL}, {State::ENDL, TokenType::LEFT_PAR} },
{ {State::LP, CharType::ADD}, {State::ADD, TokenType::LEFT_PAR} },
{ {State::LP, CharType::SUB}, {State::SUB, TokenType::LEFT_PAR} },
{ {State::LP, CharType::MUL}, {State::MUL, TokenType::LEFT_PAR} },
{ {State::LP, CharType::DIV}, {State::DIV, TokenType::LEFT_PAR} },
{ {State::LP, CharType::LP}, {State::LP, TokenType::LEFT_PAR} },
{ {State::LP, CharType::RP}, {State::RP, TokenType::LEFT_PAR} },
{ {State::LP, CharType::NUM}, {State::NUM_INT, TokenType::LEFT_PAR} },
{ {State::LP, CharType::POINT}, {State::POINT_FNT, TokenType::LEFT_PAR} },
{ {State::LP, CharType::WORD}, {State::VAR, TokenType::LEFT_PAR} },
{ {State::LP, CharType::ASN}, {State::ASN, TokenType::LEFT_PAR} },
/* right par */
{ {State::RP, CharType::END}, {State::OVER, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::SPACE}, {State::INIT, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::ENDL}, {State::ENDL, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::ADD}, {State::ADD, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::SUB}, {State::SUB, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::MUL}, {State::MUL, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::DIV}, {State::DIV, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::LP}, {State::LP, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::RP}, {State::RP, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::NUM}, {State::NUM_INT, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::POINT}, {State::POINT_FNT, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::WORD}, {State::VAR, TokenType::RIGHT_PAR} },
{ {State::RP, CharType::ASN}, {State::ASN, TokenType::RIGHT_PAR} },
/* num integer part */
{ {State::NUM_INT, CharType::END}, {State::OVER, TokenType::NUMBER} },
{ {State::NUM_INT, CharType::SPACE}, {State::INIT, TokenType::NUMBER} },
{ {State::NUM_INT, CharType::ENDL}, {State::ENDL, TokenType::NUMBER} },
{ {State::NUM_INT, CharType::ADD}, {State::ADD, TokenType::NUMBER} },
{ {State::NUM_INT, CharType::SUB}, {State::SUB, TokenType::NUMBER} },
{ {State::NUM_INT, CharType::MUL}, {State::MUL, TokenType::NUMBER} },
{ {State::NUM_INT, CharType::DIV}, {State::DIV, TokenType::NUMBER} },
{ {State::NUM_INT, CharType::LP}, {State::LP, TokenType::NUMBER} },
{ {State::NUM_INT, CharType::RP}, {State::RP, TokenType::NUMBER} },
{ {State::NUM_INT, CharType::NUM}, {State::NUM_INT, TokenType::NO_TOKEN} },
{ {State::NUM_INT, CharType::POINT}, {State::POINT_NML, TokenType::NO_TOKEN} },
{ {State::NUM_INT, CharType::WORD}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::NUM_INT, CharType::ASN}, {State::ASN, TokenType::NUMBER} },
/* front point */
{ {State::POINT_FNT, CharType::END}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::SPACE}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::ENDL}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::ADD}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::SUB}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::MUL}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::DIV}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::LP}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::RP}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::NUM}, {State::NUM_INT, TokenType::NO_TOKEN} },
{ {State::POINT_FNT, CharType::POINT}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::WORD}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_FNT, CharType::ASN}, {State::OVER, TokenType::BAD_TOKEN} },
/* normal point, which is after number */
{ {State::POINT_NML, CharType::END}, {State::OVER, TokenType::NUMBER} },
{ {State::POINT_NML, CharType::SPACE}, {State::INIT, TokenType::NUMBER} },
{ {State::POINT_NML, CharType::ENDL}, {State::ENDL, TokenType::NUMBER} },
{ {State::POINT_NML, CharType::ADD}, {State::ADD, TokenType::NUMBER} },
{ {State::POINT_NML, CharType::SUB}, {State::SUB, TokenType::NUMBER} },
{ {State::POINT_NML, CharType::MUL}, {State::MUL, TokenType::NUMBER} },
{ {State::POINT_NML, CharType::DIV}, {State::DIV, TokenType::NUMBER} },
{ {State::POINT_NML, CharType::LP}, {State::LP, TokenType::NUMBER} },
{ {State::POINT_NML, CharType::RP}, {State::RP, TokenType::NUMBER} },
{ {State::POINT_NML, CharType::NUM}, {State::NUM_DEC, TokenType::NO_TOKEN} },
{ {State::POINT_NML, CharType::POINT}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_NML, CharType::WORD}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::POINT_NML, CharType::ASN}, {State::ASN, TokenType::NUMBER} },
/* number, decimal part */
{ {State::NUM_DEC, CharType::END}, {State::OVER, TokenType::NUMBER} },
{ {State::NUM_DEC, CharType::SPACE}, {State::INIT, TokenType::NUMBER} },
{ {State::NUM_DEC, CharType::ENDL}, {State::ENDL, TokenType::NUMBER} },
{ {State::NUM_DEC, CharType::ADD}, {State::ADD, TokenType::NUMBER} },
{ {State::NUM_DEC, CharType::SUB}, {State::SUB, TokenType::NUMBER} },
{ {State::NUM_DEC, CharType::MUL}, {State::MUL, TokenType::NUMBER} },
{ {State::NUM_DEC, CharType::DIV}, {State::DIV, TokenType::NUMBER} },
{ {State::NUM_DEC, CharType::LP}, {State::LP, TokenType::NUMBER} },
{ {State::NUM_DEC, CharType::RP}, {State::RP, TokenType::NUMBER} },
{ {State::NUM_DEC, CharType::NUM}, {State::NUM_DEC, TokenType::NO_TOKEN} },
{ {State::NUM_DEC, CharType::POINT}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::NUM_DEC, CharType::WORD}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::NUM_DEC, CharType::ASN}, {State::ASN, TokenType::NUMBER} },
/* variable */
{ {State::VAR, CharType::END}, {State::OVER, TokenType::VAR} },
{ {State::VAR, CharType::SPACE}, {State::INIT, TokenType::VAR} },
{ {State::VAR, CharType::ENDL}, {State::ENDL, TokenType::VAR} },
{ {State::VAR, CharType::ADD}, {State::ADD, TokenType::VAR} },
{ {State::VAR, CharType::SUB}, {State::SUB, TokenType::VAR} },
{ {State::VAR, CharType::MUL}, {State::MUL, TokenType::VAR} },
{ {State::VAR, CharType::DIV}, {State::DIV, TokenType::VAR} },
{ {State::VAR, CharType::LP}, {State::LP, TokenType::VAR} },
{ {State::VAR, CharType::RP}, {State::RP, TokenType::VAR} },
{ {State::VAR, CharType::NUM}, {State::VAR, TokenType::NO_TOKEN} },
{ {State::VAR, CharType::POINT}, {State::OVER, TokenType::BAD_TOKEN} },
{ {State::VAR, CharType::WORD}, {State::VAR, TokenType::NO_TOKEN} },
{ {State::VAR, CharType::ASN}, {State::ASN, TokenType::VAR} },
/* = */
{ {State::ASN, CharType::END}, {State::OVER, TokenType::ASSIGN} },
{ {State::ASN, CharType::SPACE}, {State::INIT, TokenType::ASSIGN} },
{ {State::ASN, CharType::ENDL}, {State::ENDL, TokenType::ASSIGN} },
{ {State::ASN, CharType::ADD}, {State::ADD, TokenType::ASSIGN} },
{ {State::ASN, CharType::SUB}, {State::SUB, TokenType::ASSIGN} },
{ {State::ASN, CharType::MUL}, {State::MUL, TokenType::ASSIGN} },
{ {State::ASN, CharType::DIV}, {State::DIV, TokenType::ASSIGN} },
{ {State::ASN, CharType::LP}, {State::LP, TokenType::ASSIGN} },
{ {State::ASN, CharType::RP}, {State::RP, TokenType::ASSIGN} },
{ {State::ASN, CharType::NUM}, {State::NUM_INT, TokenType::ASSIGN} },
{ {State::ASN, CharType::POINT}, {State::POINT_FNT, TokenType::ASSIGN} },
{ {State::ASN, CharType::WORD}, {State::VAR, TokenType::ASSIGN} },
{ {State::ASN, CharType::ASN}, {State::ASN, TokenType::ASSIGN} },
/* \n */
{ {State::ENDL, CharType::END}, {State::OVER, TokenType::ENDL} },
{ {State::ENDL, CharType::SPACE}, {State::INIT, TokenType::ENDL} },
{ {State::ENDL, CharType::ENDL}, {State::ENDL, TokenType::ENDL} },
{ {State::ENDL, CharType::ADD}, {State::ADD, TokenType::ENDL} },
{ {State::ENDL, CharType::SUB}, {State::SUB, TokenType::ENDL} },
{ {State::ENDL, CharType::MUL}, {State::MUL, TokenType::ENDL} },
{ {State::ENDL, CharType::DIV}, {State::DIV, TokenType::ENDL} },
{ {State::ENDL, CharType::LP}, {State::LP, TokenType::ENDL} },
{ {State::ENDL, CharType::RP}, {State::RP, TokenType::ENDL} },
{ {State::ENDL, CharType::NUM}, {State::NUM_INT, TokenType::ENDL} },
{ {State::ENDL, CharType::POINT}, {State::POINT_FNT, TokenType::ENDL} },
{ {State::ENDL, CharType::WORD}, {State::VAR, TokenType::ENDL} },
{ {State::ENDL, CharType::ASN}, {State::ASN, TokenType::ENDL} }
};