private TypeSymbol WaddleExpression(ExpressionSyntax exprStmt)
{
return(exprStmt switch
{
LogicalExpressionSyntax logicalExpr => WaddleLogicalExpr(logicalExpr),
ProductExpressionSyntax productExpr => WaddleProductExpr(productExpr),
RelationalExpressionSyntax relationalExpr => WaddleRelationalExpr(relationalExpr),
TermExpressionSyntax termExpr => WaddleTermExpr(termExpr),
InvocationExpressionSyntax invocationExpr => WaddleInvocationExpr(invocationExpr),
BoolLiteralAtom _ => TypeSymbol.Bool,
IntegerLiteralAtom _ => TypeSymbol.Integer,
StringLiteralAtom _ => TypeSymbol.String,
IdentifierAtom identifierAtom => _currentFunction?.Variables[identifierAtom.Identifier].Type
?? throw new SemanticErrorException($"{identifierAtom.Identifier} does not have a type"),
_ => throw new ArgumentOutOfRangeException(nameof(exprStmt)),
});
private AtomSyntax ParseAtom()
{
switch (CurrentToken.Type)
{
case TokenType.Arrow:
{
Next();
return(ParseInvocationExpression());
}
case TokenType.Number:
{
var literal = new IntegerLiteralAtom(CurrentToken, int.Parse(CurrentToken.Lexeme));
Next();
return(literal);
}
case TokenType.False or TokenType.True:
{
var literal = new BoolLiteralAtom(CurrentToken, bool.Parse(CurrentToken.Lexeme));
Next();
return(literal);
}
case TokenType.String:
{
var literal = new StringLiteralAtom(CurrentToken, CurrentToken.Lexeme);
Next();
return(literal);
}
case TokenType.Identifier:
{
var ident = new IdentifierAtom(CurrentToken, CurrentToken.Lexeme);
Next();
return(ident);
}
default:
throw new Exception($"syntax error @({CurrentToken.LineNumber}:{CurrentToken.CharPosition}) - atom expected - found {CurrentToken.Type}");
}
}
public virtual TResult Visit(StringLiteralAtom syntax)
{
return(DefaultResult);
}
public override TypeSymbol Visit(StringLiteralAtom syntax)
{
return(TypeSymbol.String);
}
public void LeaveStringLiteral(StringLiteralAtom atom, WaddleContext ctx)
{
}
public bool EnterStringLiteral(StringLiteralAtom atom, WaddleContext ctx)
{
return(true);
}