public Task <CodeBlock> ParseAsync(ITextSnapshot snapshot, CancellationToken token)
{
CodeBlock root = new CodeBlock(null, BlockType.Root, null, new SnapshotSpan(snapshot, 0, snapshot.Length), 0, 0);
CodeBlock parent = root;
Stack <CodeBlock> blockOpenings = new Stack <CodeBlock>();
bool leadingWhitespace = true;
int statementStart = 0;
StringBuilder currentStatement = new StringBuilder();
StringBuilder filteredStatement = new StringBuilder();
SnapshotFilter filter = new SnapshotFilter(snapshot);
while (filter.Next())
{
int position = filter.Position;
char c = filter.Character;
if (leadingWhitespace)
{
leadingWhitespace = char.IsWhiteSpace(c);
statementStart = position;
}
if (!filter.InQuote)
{
if (c == '{')
{
CodeBlock child = CreateCodeBlock(parent, currentStatement, filteredStatement, new SnapshotSpan(snapshot, position, 0), statementStart, blockOpenings.Count + 1);
blockOpenings.Push(child);
parent = child;
}
else if (c == '}')
{
if (blockOpenings.Count > 0)
{
CodeBlock child = blockOpenings.Pop();
child.SetSpan(new SnapshotSpan(snapshot, Span.FromBounds(child.Span.Start, position + 1)));
parent = child.Parent;
}
}
}
if (filter.EOS)
{
currentStatement.Length = 0;
filteredStatement.Length = 0;
leadingWhitespace = true;
}
else
{
AppendCharacter(currentStatement, c);
if (!filter.InQuote)
{
AppendCharacter(filteredStatement, c);
}
}
if (token.IsCancellationRequested)
{
return(null);
}
}
while (blockOpenings.Count > 0)
{
CodeBlock child = blockOpenings.Pop();
child.SetSpan(new SnapshotSpan(snapshot, Span.FromBounds(child.Span.Start, snapshot.Length)));
}
return(Task.FromResult <CodeBlock>(root));
}
protected abstract void ParseSyntaxNode(ITextSnapshot snapshot, SyntaxNode parentSyntaxNode, CodeBlock parentCodeBlockNode, CancellationToken token, int level);
protected abstract BlockType FindType(CodeBlock parent, string statement);
protected override void ParseSyntaxNode(ITextSnapshot snapshot, SyntaxNode parentSyntaxNode, CodeBlock parentCodeBlockNode, CancellationToken token, int level)
{
if (token.IsCancellationRequested)
{
throw new TaskCanceledException();
}
else
{
foreach (var childnode in parentSyntaxNode.ChildNodes())
{
SyntaxKind kind = SyntaxKind.None;
int startPosition = 0;
int endPosition = 0;
int statementEndPosition = 0;
if (TryAsNamespace(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsClass(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsStruct(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsInterface(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsEnum(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsModule(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsMethod(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsProperty(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsPropertyAccessor(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsIf(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsElse(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsElseIf(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsFor(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsForEach(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsSelect(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsSelectCase(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsDo(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsWhile(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsTry(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsCatch(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsFinally(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsUsing(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition) ||
TryAsSyncLock(childnode, ref kind, ref startPosition, ref endPosition, ref statementEndPosition))
{
var statementStart = childnode.SpanStart;
string statement = StatementFromSpan(snapshot, startPosition, statementEndPosition);
CodeBlock child = CreateCodeBlock(parentCodeBlockNode, statement, kind, new SnapshotSpan(snapshot, Span.FromBounds(startPosition, endPosition)), statementStart, level + 1);
ParseSyntaxNode(snapshot, childnode, child, token, level + 1);
}
}
}
}
