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#include "Lexer.h"
#include <QFile>
#include <QFileInfo>
#include <QTextStream>
#include <stdexcept>
Lexer::Lexer(QObject *parent) :
QObject(parent)
{
}
void Lexer::feedFile(QString fileName)
{
QFile file(fileName);
if(!file.open(QIODevice::ReadOnly|QIODevice::Text)) {
throw std::runtime_error(QString("Can't open file: %1").arg(fileName).toStdString());
}
QTextStream in(&file);
in.setCodec("UTF-8");
lex(QFileInfo(fileName).fileName(), in.readAll());
}
void Lexer::lex(QString fileName, const QString& text)
{
int pos;
TerminalSymbolType state = TerminalSymbolType::NoState;
QString data = "";
int lineNum = 1;
int savedLineNum = 0;
for(pos = 0; pos < text.length(); pos++) {
QChar ch = text[pos];
if(ch == '\n') lineNum++;
switch(state) {
case TerminalSymbolType::NoState:
if(ch == ' ' || ch == '\t' || ch == '\n') break;
if(ch == '/' && isNextChar('*', text, pos) && isNextNextChar('*', text, pos)) {
state = TerminalSymbolType::DocComment;
data.append(ch);
savedLineNum = lineNum;
break;
}
if(ch == '/' && isNextChar('*', text, pos)) {
state = TerminalSymbolType::Comment;
savedLineNum = lineNum;
break;
}
if(ch == '/' && isNextChar('/', text, pos)) {
state = TerminalSymbolType::Comment2;
savedLineNum = lineNum;
break;
}
if(ch.isLetter() || ch == '_') {
state = TerminalSymbolType::Identifier;
data.append(ch);
savedLineNum = lineNum;
break;
}
if(ch == '\"') {
state = TerminalSymbolType::String;
savedLineNum = lineNum;
break;
}
if(ch == '\'') {
state = TerminalSymbolType::String2;
savedLineNum = lineNum;
break;
}
if(ch == '(' || ch == ')' || ch == ':' || ch == '=' || ch == '{' || ch == '}' || ch == ',' || ch == '<' || ch == '>' || ch == '[' || ch == ']' || ch == ';') {
terminals_ << TerminalSymbol(TerminalSymbolType::Delimiter, ch, fileName, lineNum);
break;
}
if(ch.isDigit() || ch == '+' || ch == '-') {
data.append(ch);
state = TerminalSymbolType::IntegerNumber;
savedLineNum = lineNum;
break;
}
if(ch == '.') {
data.append(ch);
state = TerminalSymbolType::FloatNumber;
break;
}
throw std::runtime_error(QString("Syntax error at line %1 of the file \"%2\" : %3").arg(lineNum).arg(fileName).arg(ch).toStdString());
break;
case TerminalSymbolType::DocComment:
data.append(ch);
if(ch == '*' && isNextChar('/', text, pos)) {
pos++;
data.append('/');
terminals_ << TerminalSymbol(TerminalSymbolType::DocComment, data, fileName, savedLineNum);
data = "";
state = TerminalSymbolType::NoState;
}
break;
case TerminalSymbolType::Comment:
if(ch == '*' && isNextChar('/', text, pos)) {
state = TerminalSymbolType::NoState;
pos++;
}
break;
case TerminalSymbolType::Comment2:
if(ch == '\n') {
state = TerminalSymbolType::NoState;
}
break;
case TerminalSymbolType::Identifier:
if(!ch.isLetterOrNumber() && ch != '_' && ch != '.') {
pos--; if(ch == '\n') lineNum --;
terminals_ << TerminalSymbol(TerminalSymbolType::Identifier, data, fileName, savedLineNum);
data = "";
state = TerminalSymbolType::NoState;
break;
}
data.append(ch);
break;
case TerminalSymbolType::String:
if(ch == '\"') {
terminals_ << TerminalSymbol(TerminalSymbolType::String, "\"" + data + "\"", fileName, savedLineNum);
data = "";
state = TerminalSymbolType::NoState;
break;
}
data.append(ch);
break;
case TerminalSymbolType::String2:
if(ch == '\'') {
terminals_ << TerminalSymbol(TerminalSymbolType::String, "\"" + data + "\"", fileName, savedLineNum);
data = "";
state = TerminalSymbolType::NoState;
break;
}
data.append(ch);
break;
case TerminalSymbolType::Delimiter:
throw std::runtime_error(QString("Internal error at line %1 of the file \"%2\" : %3").arg(lineNum).arg(fileName).arg(ch).toStdString());
break;
case TerminalSymbolType::IntegerNumber:
if(!ch.isDigit()) {
if(ch == '.') {
pos--;
state = TerminalSymbolType::NoState;
} else if(ch == 'e' || ch == 'E') {
pos--;
state = TerminalSymbolType::FloatNumber;
} else {
pos--; if(ch == '\n') lineNum--;
terminals_ << TerminalSymbol(TerminalSymbolType::IntegerNumber, data, fileName, savedLineNum);
data = "";
state = TerminalSymbolType::NoState;
}
break;
}
data.append(ch);
break;
case TerminalSymbolType::FloatNumber:
if(!ch.isDigit()) {
if(ch == 'e' || ch == 'E') {
data.append(ch);
if(isNextChar('+', text, pos) || isNextChar('-', text, pos)) {
pos++;
data.append(text[pos]);
}
state = TerminalSymbolType::FloatNumber2;
} else {
pos--; if(ch == '\n') lineNum--;
terminals_ << TerminalSymbol(TerminalSymbolType::FloatNumber, data, fileName, savedLineNum);
data = "";
state = TerminalSymbolType::NoState;
}
break;
}
data.append(ch);
break;
case TerminalSymbolType::FloatNumber2:
if(!ch.isDigit()) {
pos--; if(ch == '\n') lineNum--;
terminals_ << TerminalSymbol(TerminalSymbolType::FloatNumber, data, fileName, savedLineNum);
data = "";
state = TerminalSymbolType::NoState;
break;
}
data.append(ch);
break;
}
}
}
bool Lexer::isNextChar(QChar testChar, QString text, int pos)
{
if(text.length() <= (pos + 1)) return false;
return text[pos + 1] == testChar;
}
bool Lexer::isNextNextChar(QChar testChar, QString text, int pos)
{
if(text.length() <= (pos + 2)) return false;
return text[pos + 2] == testChar;
}
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