/** From label A build Graph o-A->o */
public Handle tokenRef(TerminalAST node) {
ATNState left = newState(node);
ATNState right = newState(node);
int ttype = g.getTokenType(node.getText());
left.addTransition(new AtomTransition(right, ttype));
node.atnState = left;
return new Handle(left, right);
}
/**
* For a lexer, a string is a sequence of char to match. That is, "fog" is treated as 'f' 'o' 'g'
* not as a single transition in the DFA. Machine== o-'f'->o-'o'->o-'g'->o and has n+1
* states for n characters.
*/
@Override
public Handle stringLiteral(TerminalAST stringLiteralAST) {
String chars = stringLiteralAST.getText();
chars = CharSupport.getStringFromGrammarStringLiteral(chars);
int n = chars.length();
ATNState left = newState(stringLiteralAST);
ATNState prev = left;
ATNState right = null;
for (int i = 0; i < n; i++) {
right = newState(stringLiteralAST);
prev.addTransition(new AtomTransition(right, chars.charAt(i)));
prev = right;
}
stringLiteralAST.atnState = left;
return new Handle(left, right);
}
@Override
public Handle tokenRef(TerminalAST node) {
// Ref to EOF in lexer yields char transition on -1
if (node.getText().equals("EOF")) {
ATNState left = newState(node);
ATNState right = newState(node);
left.addTransition(new AtomTransition(right, IntStream.EOF));
return new Handle(left, right);
}
return _ruleRef(node);
}
