public void Visit(NodeIndex index)
{
log.Error(index.Span, "Expressions are not valid in this placement. Perhaps you meant to put it in a function?");
}
public void Visit(NodeIndex index)
{
throw new NotImplementedException();
}
public void Visit(NodeIndex index)
{
Write("'(' ");
index.target.Accept(this);
Write(" ')'");
Write(" '.' " + index.index.Image);
}
public void Visit(NodeIndex index)
{
index.target.Accept(this);
}
private NodeExpr ParsePrimaryExpr(bool isEnclosed, bool doError = true)
{
if (!HasCurrent)
{
log.Error(GetLastSpan(), "Expected a primary expression, got end of file.");
return null;
}
NodeExpr result;
switch (Current.type)
{
case IF:
{
var @if = new NodeIf();
while (Check(IF))
{
Advance();
@if.conditions.Add(new NodeIf.IfBlock(ParseExpr(), ParseBlock()));
if (Check(EL))
{
if (!Check(IF))
{
@if.fail = ParseBlock();
break;
}
else Advance();
}
}
result = @if;
} break;
case LPAREN:
var lparen = Current;
Advance();
if (Check(RPAREN))
{
result = new NodeTuple(lparen, Current, new List<NodeExpr>());
Advance();
break;
}
bool trailingComma;
var exprs = ParseCommaList(out trailingComma);
if (exprs.Count == 1 && !trailingComma)
{
Expect(RPAREN, "Expected ')' to match opening '('.");
result = new NodeEnclosed(lparen, Last, exprs[0]);
}
else
{
Expect(RPAREN, "Expected ')' to close tuple.");
result = new NodeTuple(lparen, Last, exprs);
}
break;
case TRUE: case FALSE:
{
result = new NodeBool(Current);
Advance();
} break;
case INT:
{
result = new NodeInt(Current);
Advance();
} break;
case STR:
{
result = new NodeStr(Current);
Advance();
} break;
case IDENT:
{
result = new NodeId(Current);
Advance();
} break;
default:
if (doError)
{
log.Error(GetLastSpan(), "Unexpected token '{0}' when parsing primary expression.", Current);
Advance();
}
return null;
}
// TODO(kai): check field index.
while (Check(DOT))
{
var dot = Current;
Advance();
result = new NodeIndex(result, dot, new NodeId(ExpectIdent("Identifier expected for type index.")));
}
return ParseInvoke(result, isEnclosed);
}