protected SourceSnippet(SourceObject start, SourceObject end, SourceStruct.Type type)
{
OfType = type;
Name = ""; // name maybe set by inherited class
Sequence = start;
End = end;
}
protected SourceSnippet(string name, SourceObject start, SourceObject end, SourceStruct.Type type)
{
OfType = type;
Name = name;
Sequence = start;
End = end;
}
public SourceObject(string text, TokenRef.Type type)
{
OfType = type;
Text = text;
Sequence = null;
Previous = null;
}
protected SourceSnippet(string name, SourceStruct.Type type, SourceObject start)
{
OfType = type;
Name = name; // name maybe set by inherited class
Sequence = start;
End = null; // designates an empty Struct -e.g. a QName without a Namespace
}
public void LinkNext(SourceObject srcObj)
{
if (Sequence == null)
{
Sequence = srcObj;
srcObj.Previous = this;
}
else
{
Sequence.LinkNext(srcObj); // find the current end of the list
}
}
public static SourceStruct Build(SourceFile srcFile)
{
SourceObject start = srcFile.Sequence; // the start object in a sequence of Struct objects to process
SourceObject next = start; // the next object to process
SourceStruct first = null; // the 1st struct built upon this call
SourceStruct previous, build = null;
ParseResponse response = NextStateFunc.GoToNextState(next);
do
{
} while (response != ParseResponse.Null);
return(first);
}
private static SourceStruct.Type IdentifyType(ref SourceObject next, out SourceObject end)
{
SourceStruct.Type ofType = SourceStruct.Type.Identifying; // if not changed, this value indicates that could not be identified
switch (next.OfType)
{
case TokenRef.Type.Keyword when next.Text == "using":
ofType = SourceStruct.Type.Using;
break;
default:
throw new InvalidOperationException($"Could not identify {next.ToString()}!");
}
end = next.Sequence;
return(ofType);
}
public void InsertNextLink(SourceObject srcObj)
{
if (Sequence == null)
{
Sequence = srcObj; // at the end of the list -add object here
srcObj.Previous = this;
}
else
{
srcObj.Previous = this;
SourceObject oldNext = Sequence;
Sequence = srcObj;
srcObj.LinkNext(oldNext); // find the current end of the inserted list and link the old next object there to complete Sequence
}
}
/// <summary>Build the SourceStruct using the SoucreObject sequence from a SourceFile</summary>
/// <param name="lastSrcStruct">Ref: loaded with the last SourceStruct created previously or null if none. Gets set to the last created this call</param>
/// <param name="srcFile">The SourceFile to use for building the SourceStruct from</param>
/// <returns>The 1st SourceStruct created by this call ...</returns>
internal SourceStruct Build(ref SourceStruct lastSrcStruct, SourceFile srcFile)
{
BuildInstr instr = BuildInstr.Continue; // continue until a struct is identified
SourceObject start = srcFile.Sequence; // the start object in a sequence of Struct objects to process
SourceObject next = start; // the next object to process
SourceStruct first = null; // the 1st struct built upon this call
SourceStruct previous, build = null;
NextStateFunc.BeginParse();
while (next != null)
{
ParseResponse response = NextStateFunc.GoToNextState(next);
switch (response)
{
case ParseResponse.Accept:
if (first == null)
{
first = build;
}
break;
case ParseResponse.Resume:
break;
case ParseResponse.Next:
case ParseResponse.Call:
next = next.Sequence;
break;
default:
throw new InvalidEnumValueException(typeof(ParseResponse), response);
}
}
// TODO: add check for source file completion, i.e. nothing left on the stack
return(first);
}
protected SourceStruct(SourceObject start, Type type, SourceFile srcFile)
: base(start, type)
{
Next = null;
File = srcFile;
}
public ParseResponse GoToNextState(SourceObject next)
{
ParseResponse response = ParseResponse.Null;
NextStateRec state = CurrentState;
TokenRef token = TokenRef.Create(next.OfType, next.Text);
do
{
Debug.WriteIf(state != null, $"{{{token}}} against {{{state.Token}}}", "Check");
if (state == null)
{
response = ParseResponse.Reject;
Debug.WriteLine(" -Match! Response = Reject");
}
else if (token == state.Token)
{
response = state.Response;
Debug.WriteLine(" -Match! Response = " + response);
}
else if (state.Token.OfType == TokenRef.Type.Empty)
{
response = state.Response;
Debug.WriteLine(" -Match on Empty! Response = " + response);
}
else if (state.Token.OfType == TokenRef.Type.Null)
{
if (state.Response == ParseResponse.Next)
{
state = state.Sequence;
response = ParseResponse.Null;
}
else
{
response = state.Response;
}
Debug.WriteLine(" -Special Response = " + response);
}
else
{
Debug.WriteLine(" -NO Match! Check Next");
state = state.Sequence;
}
} while (response == ParseResponse.Null);
// Determine next state based on response
Debug.Write($"{{{state.Token }}} -> ", "Result");
switch (response)
{
case ParseResponse.Next:
CurrentState = state.Sequence;
break;
default:
throw new InvalidEnumValueException(typeof(ParseResponse), response);
}
Debug.WriteLine($"{{{CurrentState.Token}}} -Response {response}!");
return(response);
}
