private static SyntaxTree CommentSingleLineComment(this SyntaxTree syntaxTree, TextSpan textSpan)
{
var text = syntaxTree.Text;
var startLine = text.GetLineNumberFromPosition(textSpan.Start);
var endLine = text.GetLineNumberFromPosition(textSpan.End);
var lineCount = endLine - startLine + 1;
var changes = Enumerable.Range(startLine, lineCount)
.Select(i => text.Lines[i])
.Select(l => TextChange.ForInsertion(l.Span.Start, @"--"));
return(syntaxTree.WithChanges(changes));
}
private static SyntaxTree CommentMultiLineComment(this SyntaxTree syntaxTree, TextSpan textSpan)
{
var empty = new[]
{
TextChange.ForInsertion(textSpan.Start, @"/**/"),
};
var surround = new[]
{
TextChange.ForInsertion(textSpan.Start, @"/*"),
TextChange.ForInsertion(textSpan.End, @"*/")
};
var changes = textSpan.Length == 0 ? empty : surround;
return(syntaxTree.WithChanges(changes));
}
public static async Task <string> GenerateParserTest(this DocumentView documentView)
{
var document = documentView.Document;
var textSpan = documentView.Selection;
if (textSpan.Length == 0)
{
textSpan = new TextSpan(0, document.Text.Length);
}
var syntaxTree = await document.GetSyntaxTreeAsync();
var node = syntaxTree.Root.DescendantNodes()
.Last(n => n.Span.Contains(textSpan));
var nodeOrTokens = syntaxTree.Root.Root.DescendantNodesAndTokensAndSelf(true)
.Where(n => textSpan.Contains(n.Span));
var isExpression = node is ExpressionSyntax;
string text;
if (node.Span == textSpan)
{
text = document.Text.GetText(node.Span);
}
else if (syntaxTree.Root.Root.Span == textSpan)
{
text = document.Text.GetText();
}
else
{
text = document.Text.WithChanges(
TextChange.ForInsertion(textSpan.Start, "{"),
TextChange.ForInsertion(textSpan.End, "}")
).GetText();
}
using (var stringWriter = new StringWriter())
{
using (var writer = new IndentedTextWriter(stringWriter))
{
writer.Indent = 2;
var testName = node.GetType().Name.Substring(0, node.GetType().Name.Length - "Syntax".Length);
writer.WriteLine("[Fact]");
writer.WriteLine("public void Parser_Parse_{0}()", testName);
writer.WriteLine("{");
writer.Indent++;
writer.WriteLine("const string text = @\"");
using (var stringReader = new StringReader(text))
{
writer.Indent++;
string line;
while ((line = stringReader.ReadLine()) != null)
{
writer.WriteLine(line.Replace("\"", "\"\""));
}
writer.Indent--;
}
var method = isExpression ? "ForExpression" : "ForQuery";
writer.WriteLine("\";");
writer.WriteLine();
writer.WriteLine("using (var enumerator = AssertingEnumerator.{0}(text))", method);
writer.WriteLine("{");
writer.Indent++;
foreach (var nodesOrToken in nodeOrTokens)
{
if (nodesOrToken.IsNode)
{
var missingModifier = nodesOrToken.IsMissing ? "Missing" : "";
writer.WriteLine($"enumerator.AssertNode{missingModifier}(SyntaxKind.{nodesOrToken.Kind});");
}
else
{
var token = nodesOrToken.AsToken();
var tokenText = token.Text.Replace("\"", "\"\"");
if (token.IsMissing)
{
writer.WriteLine($"enumerator.AssertTokenMissing(SyntaxKind.{nodesOrToken.Kind});");
}
else
{
writer.WriteLine($"enumerator.AssertToken(SyntaxKind.{nodesOrToken.Kind}, @\"{tokenText}\");");
}
foreach (var diagnostic in token.Diagnostics)
{
writer.WriteLine($"enumerator.AssertDiagnostic(DiagnosticId.{diagnostic.DiagnosticId}, @\"{diagnostic.Message}\");");
}
}
}
writer.Indent--;
writer.WriteLine("}");
writer.Indent--;
writer.WriteLine("}");
}
return(stringWriter.ToString());
}
}