private bool TryParseAssign(out Node result)
{
if (Tokens.CurrentToken == TokenType.Symbol)
{
string name = Tokens.CurrentSymbol;
Tokens.ReadNext();
if (Tokens.CurrentToken == TokenType.Assign)
{
Node lhs = new NodeVariable(name);
Tokens.ReadNext();
Node rhs = ParseOr();
result = new NodeAssign(lhs, rhs);
return(true);
}
}
Tokens.Reset();
result = default;
return(false);
}
void ASTVisitor.Accept(NodeAssign value)
{
Accept(value);
}
internal void Accept(NodeAssign assign)
{
// There are only a few ways to assign, sooo
var target = assign.target;
if (target is NodeIdentifier)
{
assign.value.Visit(this);
builder.currentLineNumber = target.EndLine;
builder.Store((target as NodeIdentifier).image, false);
}
else if (target is NodeIndex)
{
var index = target as NodeIndex;
index.target.Visit(this);
index.args.ForEach(arg => arg.Visit(this));
assign.value.Visit(this);
builder.currentLineNumber = index.EndLine;
builder.OpIStore((uint)index.args.Count);
}
else if (target is NodeOperatorIndex)
{
var opIndex = target as NodeOperatorIndex;
opIndex.target.Visit(this);
assign.value.Visit(this);
builder.currentLineNumber = opIndex.target.EndLine;
builder.OpOIStore(opIndex.op);
}
// TODO other things when I add them
if (!assign.isResultRequired)
builder.OpPop();
}
