internal override Expression Resolve(Parser parser)
{
this.Root = this.Root.Resolve(parser);
this.Index = this.Index.Resolve(parser);
if (this.Root is CompileTimeDictionary)
{
// Swap out this bracketed expression with a fixed constant.
CompileTimeDictionary root = (CompileTimeDictionary)this.Root;
if (root.Type == "var")
{
if (this.Index is StringConstant)
{
string index = ((StringConstant)this.Index).Value;
if (parser.BuildContext.BuildVariableLookup.ContainsKey(index))
{
Crayon.BuildContext.BuildVarCanonicalized buildVar = parser.BuildContext.BuildVariableLookup[index];
switch (buildVar.Type)
{
case Crayon.BuildContext.VarType.INT: return(new IntegerConstant(this.FirstToken, buildVar.IntValue, this.FunctionOrClassOwner));
case Crayon.BuildContext.VarType.FLOAT: return(new FloatConstant(this.FirstToken, buildVar.FloatValue, this.FunctionOrClassOwner));
case Crayon.BuildContext.VarType.STRING: return(new StringConstant(this.FirstToken, buildVar.StringValue, this.FunctionOrClassOwner));
case Crayon.BuildContext.VarType.BOOLEAN: return(new BooleanConstant(this.FirstToken, buildVar.BoolValue, this.FunctionOrClassOwner));
default:
throw new System.Exception("This should not happen."); // invalid types filtered during build context construction.
}
}
else
{
return(new NullConstant(this.FirstToken, this.FunctionOrClassOwner));
// TODO: strict mode that enforces this. There are two ways this could be done:
// 1) $var['foo'] vs $optional['foo']
// 2) <strictvars>true</strictvars>
// I kind of prefer #1.
// throw new ParserException(this.Index.FirstToken, "The build variable with id '" + index + "' is not defined for this target.");
}
}
}
else
{
throw new System.Exception("Unknown compile time dictionary type.");
}
}
return(this);
}
private void CompileCompileTimeDictionary(CompileTimeDictionary compileTimeDictionary)
{
if (compileTimeDictionary.Type == "var")
{
throw new ParserException(compileTimeDictionary.FirstToken, "$var is a compile-time dictionary and must be dereferenced with a hardcoded string constant.");
}
throw new Exception(); // should not happen.
}