Ejemplo n.º 1
0
        public void Parser_UnaryExpression_HonorsPrecedences(SyntaxKind unaryKind, SyntaxKind binaryKind)
        {
            var unaryPrecedence  = unaryKind.GetUnaryOperatorPrecedence();
            var binaryPrecedence = binaryKind.GetBinaryOperatorPrecedence();
            var unaryText        = SyntaxFacts.GetText(unaryKind);
            var binaryText       = SyntaxFacts.GetText(binaryKind);
            var text             = $"{unaryText} a {binaryText} b";
            var expression       = SyntaxTree.Parse(text).Root;

            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
            {
                //  unary
                //    |
                //  binary
                //  /   \
                // 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");
                }
            }
        }
Ejemplo n.º 2
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    = SyntaxTree.Parse(text).Root;

            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");
                }
            }
        }