void ParseAttributeParameters(List <string> parameters)
{
// Attribute parameters are funny
// The contents between the brackets vary.
// They may be comma separated. They may not.
// Therefore this code is likely to break, but since I'm responsible for
// generating the text of the attributes parsed here, I can try to ensure
// that it will always fit the pattern.
while (true)
{
if (tokenizer.Peek().Kind == TypeTokenKind.RightBracket)
{
tokenizer.Next();
return;
}
TypeSpecToken value = tokenizer.Next();
if (value.Kind != TypeTokenKind.TypeName)
{
throw ErrorHelper.CreateError(ReflectorError.kTypeParseBase + 6, $"Unexpected token {value.Value} while parsing attribute parameter.");
}
parameters.Add(value.Value);
if (tokenizer.Peek().Kind == TypeTokenKind.Comma)
{
tokenizer.Next();
}
}
}
public TypeSpecToken Next()
{
if (curr != null)
{
TypeSpecToken retval = curr;
curr = null;
return(retval);
}
TypeSpecToken token = null;
do
{
switch (state)
{
case State.InName:
token = DoName();
break;
case State.InArrow:
token = DoArrow();
break;
case State.Start:
token = DoStart();
break;
}
} while (token == null);
return(token);
}
TypeSpecToken DoName()
{
int curr = reader.Peek();
if (curr < 0 || InvalidNameCharacter((char)curr))
{
if (curr == ':')
{
reader.Read(); // drop the colon
state = State.Start;
TypeSpecToken token = TypeSpecToken.LabelFromString(buffer.ToString());
buffer.Clear();
return(token);
}
else
{
state = State.Start;
TypeSpecToken token = TypeSpecToken.FromString(buffer.ToString());
buffer.Clear();
return(token);
}
}
else
{
buffer.Append((char)reader.Read());
return(null);
}
}
public TypeSpecToken Peek()
{
if (curr == null)
{
curr = Next();
}
return(curr);
}
TypeSpec Parse()
{
TypeSpecToken token = tokenizer.Peek();
TypeSpec type = null;
List <TypeSpecAttribute> attrs = null;
var inout = false;
string typeLabel = null;
// Prefix
// parse any attributes
if (token.Kind == TypeTokenKind.At)
{
attrs = ParseAttributes();
token = tokenizer.Peek();
}
// looks like it's inout
if (token.Kind == TypeTokenKind.TypeName && token.Value == "inout")
{
inout = true;
tokenizer.Next();
token = tokenizer.Peek();
}
if (token.Kind == TypeTokenKind.TypeLabel)
{
typeLabel = token.Value;
tokenizer.Next();
token = tokenizer.Peek();
}
// meat
if (token.Kind == TypeTokenKind.LeftParenthesis) // tuple
{
tokenizer.Next();
TupleTypeSpec tuple = ParseTuple();
type = tuple.Elements.Count == 1 ? tuple.Elements [0] : tuple;
typeLabel = type.TypeLabel;
}
else if (token.Kind == TypeTokenKind.TypeName) // name
{
tokenizer.Next();
var tokenValue = token.Value.StartsWith("ObjectiveC.", StringComparison.Ordinal) ?
"Foundation" + token.Value.Substring("ObjectiveC".Length) : token.Value;
type = new NamedTypeSpec(tokenValue);
}
else if (token.Kind == TypeTokenKind.LeftBracket) // array
{
tokenizer.Next();
type = ParseArray();
}
else // illegal
{
throw ErrorHelper.CreateError(ReflectorError.kTypeParseBase + 0, $"Unexpected token {token.Value}.");
}
// look-ahead for closure
if (tokenizer.Peek().Kind == TypeTokenKind.TypeName && tokenizer.Peek().Value == "throws")
{
tokenizer.Next();
if (tokenizer.Peek().Kind != TypeTokenKind.Arrow)
{
throw ErrorHelper.CreateError(ReflectorError.kTypeParseBase + 1, $"Unexpected token {tokenizer.Peek ().Value} after a 'throws' in a closure.");
}
tokenizer.Next();
type = ParseClosure(type, true);
}
if (tokenizer.Peek().Kind == TypeTokenKind.Arrow)
{
tokenizer.Next();
type = ParseClosure(type, false);
}
else if (tokenizer.Peek().Kind == TypeTokenKind.LeftAngle)
{
tokenizer.Next();
type = Genericize(type);
}
if (tokenizer.Peek().Kind == TypeTokenKind.Period)
{
tokenizer.Next();
var currType = type as NamedTypeSpec;
if (currType == null)
{
throw ErrorHelper.CreateError(ReflectorError.kTypeParseBase + 2, $"In parsing an inner type (type.type), first element is a {type.Kind} instead of a NamedTypeSpec.");
}
var nextType = Parse() as NamedTypeSpec;
if (nextType == null)
{
throw ErrorHelper.CreateError(ReflectorError.kTypeParseBase + 3, $"In parsing an inner type (type.type), the second element is a {nextType.Kind} instead of a NamedTypeSpec");
}
currType.InnerType = nextType;
}
// Postfix
if (tokenizer.Peek().Kind == TypeTokenKind.Ampersand)
{
type = ParseProtocolList(type as NamedTypeSpec);
}
while (tokenizer.Peek().Kind == TypeTokenKind.QuestionMark)
{
tokenizer.Next();
type = WrapAsBoundGeneric(type, "Swift.Optional");
}
if (tokenizer.Peek().Kind == TypeTokenKind.ExclamationPoint)
{
tokenizer.Next();
type = WrapAsBoundGeneric(type, "Swift.ImplicitlyUnwrappedOptional");
}
type.IsInOut = inout;
type.TypeLabel = typeLabel;
if (type != null && attrs != null)
{
type.Attributes.AddRange(attrs);
}
return(type);
}