// Secondary expression:
// - Depends on (alters the value of) *one* expression.
public IExpression ReadSecondaryExpression()
{
var unary_op = OperatorInfo.FromToken(CurToken);
if (unary_op != null && unary_op.Value.IsUnary)
{
Move();
}
IExpression expr;
if (CurToken.IsPunctuation("("))
{
Move();
var complex = ReadComplexExpression(ReadSecondaryExpression(), 0, true);
if (!CurToken.IsPunctuation(")"))
{
ThrowExpect("closing parenthesis", CurToken);
}
Move();
expr = complex;
if (expr is FunctionCall)
{
((FunctionCall)expr).ForceTruncateReturnValues = true;
}
}
else
{
expr = ReadPrimaryExpression();
}
while (CurToken.IsPunctuation(".") || CurToken.IsPunctuation("["))
{
if (expr is FunctionCall)
{
((FunctionCall)expr).ForceTruncateReturnValues = false;
}
if (expr is StringLiteral && ParserSettings.MaintainSyntaxErrorCompatibility)
{
Throw($"syntax error compat: can't directly index strings, use parentheses", CurToken);
}
expr = ReadTableAccess(expr);
}
while (CurToken.IsPunctuation(":"))
{
if (expr is FunctionCall)
{
((FunctionCall)expr).ForceTruncateReturnValues = false;
}
if (expr is StringLiteral && ParserSettings.MaintainSyntaxErrorCompatibility)
{
Throw($"syntax error compat: can't directly index strings, use parentheses", CurToken);
}
var self_expr = expr;
expr = ReadTableAccess(expr, allow_colon: true);
expr = ReadFunctionCall(expr, self_expr);
}
if (CurToken.IsPunctuation("("))
{
if (expr is FunctionCall)
{
((FunctionCall)expr).ForceTruncateReturnValues = false;
}
if (expr is StringLiteral && ParserSettings.MaintainSyntaxErrorCompatibility)
{
Throw($"syntax error compat: can't directly call strings, use parentheses", CurToken);
}
expr = ReadFunctionCall(expr);
}
else if (CurToken.IsPunctuation("{"))
{
if (expr is FunctionCall)
{
((FunctionCall)expr).ForceTruncateReturnValues = false;
}
if (expr is StringLiteral && ParserSettings.MaintainSyntaxErrorCompatibility)
{
Throw($"syntax error compat: can't directly call strings, use parentheses", CurToken);
}
expr = new FunctionCall {
Function = expr,
Arguments = new List <IExpression> {
ReadTableConstructor()
}
};
}
else if (CurToken.Type == TokenType.QuotedString)
{
if (expr is FunctionCall)
{
((FunctionCall)expr).ForceTruncateReturnValues = false;
}
if (expr is StringLiteral && ParserSettings.MaintainSyntaxErrorCompatibility)
{
Throw($"syntax error compat: can't directly call strings, use parentheses", CurToken);
}
expr = new FunctionCall {
Function = expr,
Arguments = new List <IExpression> {
ReadStringLiteral()
}
};
}
if (unary_op != null && unary_op.Value.IsUnary)
{
if (expr is FunctionCall)
{
((FunctionCall)expr).ForceTruncateReturnValues = false;
}
expr = new UnaryOp(unary_op.Value.UnaryOpType.Value, expr);
}
return(expr);
}