예제 #1
0
        public void Parser_BinaryExpression_HonorsPrecedences(SyntaxKind op1, SyntaxKind op2)
        {
            var op1Precedence = SyntaxFacts.GetBinaryOperatorPrecedence(op1);
            var op2Precedence = SyntaxFacts.GetBinaryOperatorPrecedence(op2);

            var op1Text = SyntaxFacts.GetText(op1);
            var op2Text = SyntaxFacts.GetText(op2);

            var text       = $"a {op1Text} b {op2Text} c";
            var expression = ParseExpression(text);

            if (op1Precedence >= op2Precedence)
            {
                //      op2
                //     /   \
                //    op1   c
                //   /   \
                //  a     b

                using (var e = new AssertingEnumerator(expression))
                {
                    e.AssertNode(SyntaxKind.BinaryExpression);
                    e.AssertNode(SyntaxKind.BinaryExpression);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "a");
                    e.AssertToken(op1, op1Text);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "b");
                    e.AssertToken(op2, op2Text);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "c");
                }
            }
            else
            {
                //      op1
                //     /   \
                //    a    op2
                //        /   \
                //       b     c

                using (var e = new AssertingEnumerator(expression))
                {
                    e.AssertNode(SyntaxKind.BinaryExpression);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "a");
                    e.AssertToken(op1, op1Text);
                    e.AssertNode(SyntaxKind.BinaryExpression);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "b");
                    e.AssertToken(op2, op2Text);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "c");
                }
            }
        }
예제 #2
0
        public void Parser_UnaryExpression_HonorsPrecedences(SyntaxKind unaryKind, SyntaxKind binaryKind)
        {
            var unaryPrecedence  = SyntaxFacts.GetUnaryOperatorPrecedence(unaryKind);
            var binaryPrecedence = SyntaxFacts.GetBinaryOperatorPrecedence(binaryKind);

            var unaryText  = SyntaxFacts.GetText(unaryKind);
            var binaryText = SyntaxFacts.GetText(binaryKind);

            var text       = $"{unaryText} a {binaryText} b";
            var expression = ParseExpression(text);

            if (unaryPrecedence >= binaryPrecedence)
            {
                //    binary
                //    /   \
                //  unary  b
                //    |
                //    a

                using (var e = new AssertingEnumerator(expression))
                {
                    e.AssertNode(SyntaxKind.BinaryExpression);
                    e.AssertNode(SyntaxKind.UnaryExpression);
                    e.AssertToken(unaryKind, unaryText);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "a");
                    e.AssertToken(binaryKind, binaryText);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "b");
                }
            }
            else
            {
                //    binary
                //      |
                //    unary
                //    /   \
                //   a     b

                using (var e = new AssertingEnumerator(expression))
                {
                    e.AssertNode(SyntaxKind.UnaryExpression);
                    e.AssertToken(unaryKind, unaryText);
                    e.AssertNode(SyntaxKind.BinaryExpression);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "a");
                    e.AssertToken(binaryKind, binaryText);
                    e.AssertNode(SyntaxKind.NameExpression);
                    e.AssertToken(SyntaxKind.IdentifierToken, "b");
                }
            }
        }