public static Node?GetInitializer(
this NeuInitClause initClause)
{
var puncReached = false;
///
foreach (var c in initClause.Children)
{
switch (c)
{
case NeuPunc _ when !puncReached: // only toggle on a single punc
puncReached = true;
break;
///
case Node _ when puncReached:
return(c);
///
default:
continue;
}
}
///
return(null);
}
///
public static NeuOperation Execute(
this NeuInterpreter interpreter,
bool inGlobalScope,
NeuKeyword kindKeyword,
NeuIdentifierPattern idPattern,
NeuInitClause initClause)
{
var id = idPattern.GetIdentifier();
if (id == null)
{
throw new Exception();
}
///
var name = id.Source;
if (IsNullOrWhiteSpace(name))
{
throw new Exception();
}
///
var initializer = initClause.GetInitializer();
if (initializer == null)
{
throw new Exception();
}
///
var initValue = interpreter.Execute(initializer);
///
switch (true)
{
case var _
when
inGlobalScope &&
kindKeyword.KeywordType == NeuKeywordType.Let:
var globalScopedLet = interpreter.CreateVar(name, null, null, null, initValue);
if (globalScopedLet == null)
{
throw new Exception();
}
return(globalScopedLet);
///
case var _
when
inGlobalScope &&
kindKeyword.KeywordType == NeuKeywordType.Var:
var globalScopedVar = interpreter.CreateVar(name, null, null, null, initValue);
if (globalScopedVar == null)
{
throw new Exception();
}
return(globalScopedVar);
///
case var _
when
kindKeyword.KeywordType == NeuKeywordType.Let:
var hoistedLet = interpreter.HoistVar(kindKeyword.KeywordType, name, initValue);
if (hoistedLet == null)
{
throw new Exception();
}
return(hoistedLet);
///
case var _
when
kindKeyword.KeywordType == NeuKeywordType.Var:
var hoistedVar = interpreter.HoistVar(kindKeyword.KeywordType, name, initValue);
if (hoistedVar == null)
{
throw new Exception();
}
return(hoistedVar);
///
default:
throw new Exception();
}
}
