public void TestSkipNewLine()
        {
            var tokeniser = new PhpTokeniser("\n\n\n \n   $");

            tokeniser.SkipWhitespace();

            Assert.Equal('$', tokeniser.GetTrivia());
        }
        public void TestSkipLineComment()
        {
            var tokeniser = new PhpTokeniser(@"
//
// line 1
// line 2
// // //

$");

            tokeniser.SkipWhitespace();

            Assert.Equal('$', tokeniser.GetTrivia());
        }
        public static PhpArrayElementSyntaxNode Parse(PhpTokeniser tokeniser)
        {
            tokeniser.SkipWhitespace();

            PhpStringLiteralSyntaxNode key = tokeniser.GetTrivia() switch
            {
                '\'' => PhpStringLiteralSyntaxNode.Parse(tokeniser),
                '"' => PhpStringLiteralSyntaxNode.Parse(tokeniser),
                _ => throw tokeniser.ConstructError($"Invalid array value identifier ({tokeniser.GetTrivia()}).")
            };

            tokeniser.SkipWhitespace();
            tokeniser.SkipPattern(new[] { '=', '>' });
            tokeniser.SkipWhitespace();

            PhpSyntaxNode value = tokeniser.GetTrivia() switch
            {
                '\'' => PhpStringLiteralSyntaxNode.Parse(tokeniser),
                '"' => PhpStringLiteralSyntaxNode.Parse(tokeniser),
                '[' => PhpArraySyntaxNode.Parse(tokeniser),
                _ => throw tokeniser.ConstructError($"Invalid array value identifier ({tokeniser.GetTrivia()}).")
            };

            tokeniser.SkipWhitespace();

            // Skip trailing trivia for this element.
            if (tokeniser.TryGetTrivia(out var trivia) && trivia == ',')
            {
                tokeniser.Advance();
            }
            tokeniser.SkipWhitespace();

            return(new PhpArrayElementSyntaxNode(key, value));
        }
    }
}
        public void TestSkipBlockComment()
        {
            var tokeniser = new PhpTokeniser(@"
/**
 * This is a
 * BLOCK COMMENT!!
 */
/**/

$");

            tokeniser.SkipWhitespace();

            Assert.Equal('$', tokeniser.GetTrivia());
        }