/// <summary> /// Converts a given source text into a stream of tokens that can be consumed to create a syntax tree. /// </summary> /// <param name="source">The source text to analyze.</param> /// <returns>TokenStream.</returns> public static TokenStream Tokenize(SourceText source) { var tokenSet = new TokenStream(source.Text); source.SkipWhitespace(); while (source.HasData) { SourceLocation location; // Comments // ------------------- if (source.CheckCursor(SR.IsCommentGlyph)) { var text = source.NextComment(out location); tokenSet.Enqueue(new CommentToken(text, location)); } // Flow Controler characer (non-text entities) // ------------------- else if (source.CheckCursor(SR.IsControlGlyph)) { var text = source.NextControlPhrase(out location); tokenSet.Enqueue(new ControlToken(text.ToTokenType(), text, location)); } // Named fields // --------------------------------- else if (source.CheckCursor(SR.IsStartOfNameGlyph)) { var text = source.NextName(out location); tokenSet.Enqueue(Lexer.CharactersToToken(text, location)); } // Numbers // ---------------------------------- else if (source.CheckCursor(SR.IsStartOfNumberGlyph)) { var text = source.NextNumber(out location); tokenSet.Enqueue(NumberToken.FromSourceText(text, location)); } // Strings // ---------------------------------- else if (source.CheckCursor(SR.IsStringDelimiterGlyph)) { var text = source.NextString(out location); tokenSet.Enqueue(new StringToken(text, location)); } else { // who the heck knows, just fail location = source.RetrieveCurrentLocation(); throw new GraphQLSyntaxException( location, $"Unexpected character: '{source.Peek()}'"); } source.SkipWhitespace(); } tokenSet.Enqueue(EndOfFileToken.Instance); return(tokenSet); }
public void SourceText_CheckCursor(string sourceText, int offSet, GraphQLSourceRule rule, bool expectedValue) { var source = new SourceText(sourceText.AsMemory(), offSet); Assert.AreEqual(expectedValue, source.CheckCursor(rule)); }