Exemple #1
0
        public void Parser_BinaryExpression_HonorsPrecedence(SyntaxKind op1, SyntaxKind op2)
        {
            var op1Precedence = SyntaxRules.GetBinaryOperatorPrecedence(op1);
            var op2Precedence = SyntaxRules.GetBinaryOperatorPrecedence(op2);
            var op1Text       = SyntaxRules.GetText(op1);
            var op2Text       = SyntaxRules.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_HonorsPrecedence(SyntaxKind unaryKind, SyntaxKind binaryKind)
        {
            var unaryPrecedence  = SyntaxRules.GetUnaryOperatorPrecedence(unaryKind);
            var binaryPrecedence = SyntaxRules.GetBinaryOperatorPrecedence(binaryKind);
            var unaryText        = SyntaxRules.GetText(unaryKind);
            var binaryText       = SyntaxRules.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");
                }
            }
        }