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"); } }
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"); } }