int grabInteger() {
int result = 0;
int sign = 1;
char c;
peekCharacter(c);
if(c=='-') {
passCharacter();
sign = -1;
peekCharacter(c);
};
if('0'<=c&&c<='9') {
while('0'<=c && c<='9') {
passCharacter();
result *=10;
result += (c-'0');
if(eof()) break;
peekCharacter(c);
};
} else {
GBStream << "Error: no integer found\n.";
errorh(__LINE__);
};
result *= sign;
return result;
};
simpleString getString(int & len,bool keep = true) {
bool save = d_skipws;
d_skipws = false;
if(!d_word) {
d_word = new char[1001];
} else if(strlen(d_word)<1000) {
delete d_word;
d_word = new char[10001];
};
char * t = d_word;
char c;
getCharacter(c);
if(c!='\"') errorh(__LINE__);
if(keep) {
*t=c;++t;++len;
};
peekCharacter(c);
len = 0;
while(c!='\"') {
passCharacter();
*t = c;++t;++len;
if(len>1000) errorh(__LINE__);
peekCharacter(c);
};
if(keep) {
*t=c;++t;++len;
};
passCharacter();
*t = '\0';
simpleString result(d_word);
d_skipws = save;
return result;
};
simpleString getAlphaNumWord(int & len) {
len = 0;
if(!d_word) {
d_word = new char[1001];
} else if(strlen(d_word)<1000) {
delete d_word;
d_word = new char[1001];
};
char c;
char * t = d_word;
peekCharacter(c);
if(('a'<=c && c <= 'z') ||
('A'<=c && c <= 'Z')) {
while(('a'<=c && c <= 'z') ||
('A'<=c && c <= 'Z') ||
('0'<=c && c <= '9')) {
passCharacter();
*t = c;
++t;++len;
if(len>1000) errorh(__LINE__);
if(eof()) break;
peekCharacter(c);
};
};
*t = '\0';
simpleString result(d_word);
return result;
};
void passString() {
char c;
getCharacter(c);
if(c!='\"') errorh(__LINE__);
peekCharacter(c);
while(c!='\"') {
passCharacter();
peekCharacter(c);
};
passCharacter();
};
simpleString getUntilCharacterButNot(const char * avoids,int & len) {
len = 0;
if(!d_word) {
d_word = new char[1001];
} else if(strlen(d_word)<1000) {
delete d_word;
d_word = new char[10001];
};
char * t = d_word;
peekCharacter(*t);
while(check(*t,avoids)) {
passCharacter();
++t;++len;
if(len>1000) errorh(__LINE__);
peekCharacter(*t);
};
*t = '\0';
simpleString result(d_word);
return result;
};
simpleString getUntilCharacterButNot(char avoid) {
int len = 0;
if(!d_word) {
d_word = new char[1001];
} else if(strlen(d_word)<1000) {
delete d_word;
d_word = new char[1001];
};
char * t = d_word;
peekCharacter(*t);
cout << "char:" << *t << endl;
while(*t!=avoid) {
cout << "char:" << *t << endl;
passCharacter();
++t;++len;
if(len>1000) errorh(__LINE__);
peekCharacter(*t,"\n\t ");
};
*t = '\0';
simpleString result(d_word);
return result;
};
int getNumber() {
int result = 0;
int sign = 1;
char c;
peekCharacter(c);
if(c=='-') {
sign = -1;
passCharacter();
peekCharacter(c);
if(c=='+') {
passCharacter();
peekCharacter(c);
} else if(c=='-') {
sign = 1;
passCharacter();
peekCharacter(c);
};
} else if(c=='+') {
passCharacter();
peekCharacter(c);
if(c=='+') {
passCharacter();
peekCharacter(c);
} else if(c=='-') {
sign = -1;
passCharacter();
peekCharacter(c);
};
};
if('0'<=c&&c<='9') {
while('0'<=c && c<='9') {
passCharacter();
result *=10;
result += (c-'0');
if(eof()) break;
peekCharacter(c);
};
} else {
GBStream << "Error: no integer found";
GBStream << "Last character peeked:" << c << '\n';
errorh(__LINE__);
};
result *= sign;
return result;
};
Token EBNFScanner::scanComment()
{
char currchar = getCurrentCharacter();
TokPosition pos = createPosition();
String content = String(&currchar, 1);
while (hasNextCharacter())
{
nextCharacter();
content.append(getCurrentCharacter());
if(getCurrentCharacter() == '*' && peekCharacter() == ')')
{
nextCharacter();
content.append(getCurrentCharacter());
break;
}
checkNewLine();
}
return Token (TokComment, content, pos);
}
Token EBNFScanner::scanOperator()
{
TokPosition pos = createPosition();
char currchar = getCurrentCharacter();
String content = String(&currchar, 1);
char peak = peekCharacter();
if(getCurrentCharacter() == ':' && peak == ':')
{
nextCharacter();
content.append(getCurrentCharacter());
nextCharacter();
if(getCurrentCharacter() != '=') {
raiseError (String("Expecting '=' but got '") + getCurrentCharacter() + "' instead.");
content.append(getCurrentCharacter());
return Token (Token::TypeInvalid, content, pos);
}
content.append(getCurrentCharacter());
}
return Token (TokOperator, content, pos);
}
void getCharacter(char & c) {
peekCharacter(c);
passCharacter();
};
void getCharacter(char & c,const char * ignore) {
peekCharacter(c,ignore);
d_useUnget = false;
};
void EBNFScanner::nextToken()
{
if(currentToken > -1 && currentToken < tokens.size() - 1)
{
currentToken++;
return;
}
while (hasNextCharacter())
{
nextCharacter();
// Scan the Identifier type. [a-zA-Z\-_]
if(TokenScannerHelper::isAlpha(currentCharacter))
{
Token tok = scanIdentifier();
tokens.append(std::move(tok));
currentToken++;
return;
}
// Scan a literal
else if (TokenScannerHelper::isQuote(currentCharacter))
{
Token tok = scanLiteral();
tokens.append(std::move(tok));
currentToken++;
return;
}
// Scan an operator Token.
else if (TokenScannerHelper::isOperator(currentCharacter))
{
if (currentCharacter == '(' && peekCharacter() == '*') {
Token tok = scanComment();
tokens.append(std::move(tok));
currentToken++;
return;
}
else {
Token tok = scanOperator();
tokens.append(std::move(tok));
currentToken++;
return;
}
}
else if (TokenScannerHelper::isWhiteSpace(currentCharacter))
{
// Ignore white spaces.
}
else
{
raiseError (String("Invalid Character."));
}
checkNewLine();
}
tokens.append(Token(Token::TypeEof, String(""), createPosition()));
currentToken++;
}