Exemple #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");
            }
        }
Exemple #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
            {
                //  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");
            }
        }