private void logFloatTooBig(LiteralContext litContext)
{
log.error(
new DiagnosticPosition(litContext.Start.Line, litContext.Start.Column),
messages.floatLiteratTooBig, litContext.GetText()
);
}
public override Tree VisitLiteral(LiteralContext context)
{
IToken symbol;
String text;
Object value;
TypeTag type;
switch (context.literalType)
{
case INT:
symbol = context.IntegerLiteral().Symbol;
text = symbol.Text;
if (Int32.TryParse(text, out var intLit))
{
type = TypeTag.INT;
value = intLit;
}
else if (Int64.TryParse(text, out var longLit))
{
type = TypeTag.LONG;
value = longLit;
}
else
{
log.error(
new DiagnosticPosition(context.Start.Line, context.Start.Column),
messages.intLiteratTooBig, context.GetText()
);
type = TypeTag.ERROR;
value = 0;
}
break;
case FLOAT:
symbol = context.FloatingPointLiteral().Symbol;
text = symbol.Text;
if (text.EndsWith("f") || text.EndsWith("F"))
{
text = text.Substring(0, text.Length - 1);
type = TypeTag.FLOAT;
if (Single.TryParse(text, out var floatLit))
{
value = floatLit;
}
else
{
value = 0;
logFloatTooBig(context);
}
}
else if (text.EndsWith("d") || text.EndsWith("D"))
{
type = TypeTag.DOUBLE;
if (Double.TryParse(text, out var doubleLit))
{
value = doubleLit;
}
else
{
value = 0;
logFloatTooBig(context);
}
}
else if (Single.TryParse(text, out var floatLit))
{
type = TypeTag.FLOAT;
value = floatLit;
}
else if (Double.TryParse(text, out var doubleLit))
{
type = TypeTag.DOUBLE;
value = doubleLit;
}
else
{
type = TypeTag.ERROR;
value = 0;
logFloatTooBig(context);
}
break;
case BOOLEAN:
symbol = context.BooleanLiteral().Symbol;
text = symbol.Text;
type = TypeTag.BOOLEAN;
value = Boolean.Parse(text);
break;
case CHAR:
symbol = context.CharLiteral().Symbol;
text = symbol.Text;
type = TypeTag.CHAR;
value = parseCharLiteral(text);
break;
case CSTRING:
symbol = context.CStringLiteral().Symbol;
text = symbol.Text;
type = TypeTag.C_STRING;
value = parseStringLiteral(text);
break;
case NULL:
value = null;
symbol = context.NULL().Symbol;
type = TypeTag.NULL;
text = "null";
break;
default:
throw new InvalidOperationException();
}
int line = symbol.Line;
int startColumn = symbol.Column;
int endColumn = startColumn + text.Length;
return(new LiteralExpression(line, startColumn, line, endColumn, type, value));
}