namespace Tvl.VisualStudio.Language.Java

{

using System;

using System.Collections.Generic;

using System.Diagnostics.Contracts;

using Antlr.Runtime;

using Microsoft.VisualStudio.Text;

using Tvl.VisualStudio.Language.Parsing;

using Tvl.VisualStudio.OutputWindow.Interfaces;

using Stopwatch = System.Diagnostics.Stopwatch;

public class JavaBackgroundParser : BackgroundParser

{

private readonly JavaBackgroundParserProvider _provider;

public JavaBackgroundParser(ITextBuffer textBuffer, JavaBackgroundParserProvider provider)

: base(textBuffer, provider.BackgroundIntelliSenseTaskScheduler, provider.TextDocumentFactoryService, provider.OutputWindowService)

{

Contract.Requires<ArgumentNullException>(provider != null, "provider");

_provider = provider;

}

protected override void ReParseImpl()

{

var outputWindow = OutputWindowService.TryGetPane(PredefinedOutputWindowPanes.TvlIntellisense);

Stopwatch stopwatch = Stopwatch.StartNew();

string filename = "<Unknown File>";

ITextDocument textDocument = TextDocument;

if (textDocument != null)

filename = textDocument.FilePath;

var snapshot = TextBuffer.CurrentSnapshot;

ANTLRStringStream input = new ANTLRStringStream(snapshot.GetText());

Java2Lexer lexer = new Java2Lexer(new JavaUnicodeStream(input));

CommonTokenStream tokens = new CommonTokenStream(lexer);

Java2Parser parser = new Java2Parser(tokens);

List<ParseErrorEventArgs> errors = new List<ParseErrorEventArgs>();

parser.ParseError += (sender, e) =>

{

errors.Add(e);

string message = e.Message;

if (message.Length > 100)

message = message.Substring(0, 100) + " ...";

ITextSnapshotLine startLine = snapshot.GetLineFromPosition(e.Span.Start);

int line = startLine.LineNumber;

int column = e.Span.Start - startLine.Start;

if (outputWindow != null)

outputWindow.WriteLine(string.Format("{0}({1},{2}): {3}", filename, line + 1, column + 1, message));

if (errors.Count > 100)

throw new OperationCanceledException();

};

var result = parser.compilationUnit();

OnParseComplete(new AntlrParseResultEventArgs(snapshot, errors, stopwatch.Elapsed, tokens.GetTokens(), result));

}

}

}