//not_test: 'not' not_test | comparison
private Expression ParseNotTest() {
if (MaybeEat(TokenKind.KeywordNot)) {
var start = GetStart();
Expression ret = new UnaryExpression(PythonOperator.Not, ParseNotTest());
ret.SetLoc(_globalParent, start, GetEnd());
return ret;
} else {
return ParseComparison();
}
}
// factor: ('+'|'-'|'~') factor | power
private Expression ParseFactor() {
var start = _lookahead.Span.Start;
Expression ret;
switch (PeekToken().Kind) {
case TokenKind.Add:
NextToken();
ret = new UnaryExpression(PythonOperator.Pos, ParseFactor());
break;
case TokenKind.Subtract:
NextToken();
ret = FinishUnaryNegate();
break;
case TokenKind.Twiddle:
NextToken();
ret = new UnaryExpression(PythonOperator.Invert, ParseFactor());
break;
default:
return ParsePower();
}
ret.SetLoc(_globalParent, start, GetEnd());
return ret;
}
// factor: ('+'|'-'|'~') factor | power
private Expression ParseFactor()
{
Token t = PeekToken();
Location start = GetStart();
Expression ret;
switch (t.Kind) {
case TokenKind.Add:
NextToken();
ret = new UnaryExpression(PythonOperator.Pos, ParseFactor());
break;
case TokenKind.Subtract:
NextToken();
ret = FinishUnaryNegate();
break;
case TokenKind.Twiddle:
NextToken();
ret = new UnaryExpression(PythonOperator.Invert, ParseFactor());
break;
default:
return ParsePower();
}
ret.SetLoc(GetExternal(), start, GetEnd());
return ret;
}