コード例 #1
0
        /// <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);
        }
コード例 #2
0
        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));
        }