public Value Evaluate(Environment environment)
{
var modules = environment.GetModules();
// resolve module file, identifier and name
string spec;
if (modulespec is NodeIdentifier)
{
spec = ((NodeIdentifier)this.modulespec).GetValue();
if (environment.IsDefined(spec))
{
var val = environment.Get(spec, this.pos);
if (!(val.IsObject() && val.AsObject().isModule))
{
if (!val.IsString())
{
throw new ControlErrorException(new ValueString("ERROR"), "Expected string or identifier modulespec but got " + val.Type(), pos);
}
spec = val.AsString().GetValue();
}
}
}
else
{
var specval = this.modulespec.Evaluate(environment);
if (!specval.IsString())
{
throw new ControlErrorException(new ValueString("ERROR"), "Expected string or identifier modulespec but got " + specval.Type(), pos);
}
spec = specval.AsString().GetValue();
}
var modulefile = spec;
if (!modulefile.EndsWith(".ckl"))
{
modulefile += ".ckl";
}
string moduleidentifier;
var modulename = this.name;
var parts = spec.Split('/');
var name = parts[parts.Length - 1];
if (name.EndsWith(".ckl"))
{
name = name.Substring(0, name.Length - 4);
}
moduleidentifier = name;
if (modulename == null)
{
modulename = name;
}
environment.PushModuleStack(moduleidentifier, pos);
// lookup or read module
Environment moduleEnv = null;
if (modules.ContainsKey(moduleidentifier))
{
moduleEnv = modules[moduleidentifier];
}
else
{
moduleEnv = environment.GetBase().NewEnv();
var modulesrc = ModuleLoader.LoadModule(modulefile, environment, pos);
Node node = null;
try {
node = Parser.Parse(modulesrc, modulefile);
} catch (Exception) {
throw new ControlErrorException(new ValueString("ERROR"), "Cannot parse module " + moduleidentifier, pos);
}
node.Evaluate(moduleEnv);
modules[moduleidentifier] = moduleEnv;
}
environment.PopModuleStack();
// bind module or contents of module
if (unqualified)
{
foreach (var symbol in moduleEnv.GetLocalSymbols())
{
if (symbol.StartsWith("_"))
{
continue; // skip private module symbols
}
environment.Put(symbol, moduleEnv.Get(symbol, pos));
}
}
else if (symbols != null)
{
foreach (var symbol in moduleEnv.GetLocalSymbols())
{
if (symbol.StartsWith("_"))
{
continue; // skip private module symbols
}
if (!symbols.ContainsKey(symbol))
{
continue;
}
environment.Put(symbols[symbol], moduleEnv.Get(symbol, pos));
}
}
else
{
var obj = new ValueObject {
isModule = true
};
foreach (var symbol in moduleEnv.GetLocalSymbols())
{
if (symbol.StartsWith("_"))
{
continue; // skip private module symbols
}
var val = moduleEnv.Get(symbol, pos);
if (val.IsObject() && val.AsObject().isModule)
{
continue; // do not re-export modules!
}
obj.AddItem(symbol, val);
}
environment.Put(modulename, obj);
}
return(ValueNull.NULL);
}