private StatementSyntax ParseReturnStatement()
{
var keyword = MatchToken(SyntaxKind.ReturnKeyword);
var keywordLine = _text.GetLineIndex(keyword.Span.Start);
var currentLine = _text.GetLineIndex(Current.Span.Start);
var isEof = Current.Kind == SyntaxKind.EndOfFileToken;
var sameLine = !isEof && keywordLine == currentLine;
var expression = sameLine ? ParseExpression() : null;
return(new ReturnStatementSyntax(keyword, expression));
}
private static void WriteDiagnostics(SourceText sourceText, ImmutableArray <Diagnostic> diagnostics)
{
Console.WriteLine();
foreach (var diagnostic in diagnostics)
{
var lineIndex = sourceText.GetLineIndex(diagnostic.Span.Start);
var line = sourceText.Lines[lineIndex];
var columnNumber = diagnostic.Span.Start - line.Start + 1;
var prefixSpan = TextSpan.FromBounds(line.Start, diagnostic.Span.Start);
var suffixSpan = TextSpan.FromBounds(diagnostic.Span.End, line.End);
var prefix = sourceText.ToString(prefixSpan.Start, prefixSpan.Length);
var error = sourceText.ToString(diagnostic.Span.Start, diagnostic.Span.Length);
var suffix = sourceText.ToString(suffixSpan.Start, suffixSpan.Length);
Console.ForegroundColor = ConsoleColor.DarkRed;
Console.Write($"({lineIndex + 1}, {columnNumber}): ");
Console.WriteLine(diagnostic);
Console.ResetColor();
Console.Write(" ");
Console.Write(prefix);
Console.ForegroundColor = ConsoleColor.DarkRed;
Console.Write(error);
Console.ResetColor();
Console.WriteLine(suffix);
}
Console.WriteLine();
}
public void Calculates_LineIndex_Correctly(int position, int expectedLine)
{
var input = "One\nTwo\r\nThree";
var sourceText = new SourceText(input);
Assert.That(sourceText.GetLineIndex(position), Is.EqualTo(expectedLine));
}
private static void PrintErrors(IEnumerable <Error> errors, SourceText text)
{
foreach (var error in errors)
{
// Stuff for line numbers
var lineindex = text.GetLineIndex(error.Span.Start);
var linenumber = lineindex + 1;
var line = text.Lines[lineindex];
var character = error.Span.Start - line.Start + 1;
// Print the message
Console.ForegroundColor = ConsoleColor.Red;
Console.Write($"({linenumber}, {character}): {error}");
Console.ResetColor();
// Prevent it from trying to highlight an empty token
if (error.Details.Contains("Unexpected token <EOFToken>"))
{
Console.WriteLine();
break;
}
var prefixspan = TextSpan.FromBounds(line.Start, error.Span.Start);
var suffixspan = TextSpan.FromBounds(error.Span.End, line.End);
var prefix = text.ToString(prefixspan);
var occurrence = text.ToString(error.Span);
var suffix = text.ToString(suffixspan);
// Print what is before the error
Console.WriteLine(" ");
Console.Write(prefix);
// Print where the error occurs
Console.ForegroundColor = ConsoleColor.DarkRed;
Console.Write(occurrence);
Console.ResetColor();
// Print what is after the error
Console.Write(suffix);
Console.WriteLine();
// Print arrow
Console.ForegroundColor = ConsoleColor.DarkRed;
for (int _ = 0; _ < prefix.Length; _++)
{
Console.Write(" ");
}
for (int _ = 0; _ < occurrence.Length; _++)
{
Console.Write("^");
}
Console.WriteLine();
Console.ResetColor();
}
}
protected override void EvaluateSubmission(string text)
{
SyntaxTree syntaxTree = SyntaxTree.Parse(text);
Compilation compilation = previous == null
? new Compilation(syntaxTree)
: previous.ContinueWith(syntaxTree);
if (showTree)
{
syntaxTree.Root.WriteTo(Console.Out);
}
if (showProgram)
{
compilation.EmitTree(Console.Out);
}
EvaluationResult result = compilation.Evaluate(variables);
IReadOnlyList <Diagnostic> diagnostics = result.Diagnostics;
if (!diagnostics.Any())
{
if (result.Value != null)
{
Console.ForegroundColor = ConsoleColor.White;
Console.WriteLine(result.Value);
Console.ResetColor();
}
previous = compilation;
}
else
{
foreach (Diagnostic diagnostic in diagnostics.OrderBy(d => d.Span, new TextSpanComparer()))
{
SourceText treeText = syntaxTree.Text;
int lineIndex = treeText.GetLineIndex(diagnostic.Span.Start);
var line = treeText.Lines[lineIndex];
int lineNumber = lineIndex + 1;
int character = diagnostic.Span.Start - line.Start + 1;
Console.WriteLine();
Console.ForegroundColor = ConsoleColor.DarkRed;
Console.Write($"({lineNumber}, {character}): ");
Console.WriteLine(diagnostic);
Console.ResetColor();
TextSpan prefixSpan = TextSpan.FromBounds(line.Start, diagnostic.Span.Start);
TextSpan suffixSpan = TextSpan.FromBounds(diagnostic.Span.End, line.End);
string prefix = treeText.ToString(prefixSpan);
string error = treeText.ToString(diagnostic.Span);
string suffix = treeText.ToString(suffixSpan);
Console.Write($" {prefix}");
Console.ForegroundColor = ConsoleColor.DarkRed;
Console.Write(error);
Console.ResetColor();
Console.Write(suffix);
Console.WriteLine();
}
Console.WriteLine();
}
}