Expression?MakeSqlValue(Expression?exp)
{
if (exp == null)
{
return(null !);
}
if (!inSql || !IsBooleanExpression(exp))
{
return(exp);
}
if (exp.NodeType == ExpressionType.Constant)
{
switch (((bool?)((ConstantExpression)exp).Value))
{
case false: return(new SqlConstantExpression(0, exp.Type));
case true: return(new SqlConstantExpression(1, exp.Type));
case null: return(new SqlConstantExpression(null, exp.Type));
}
}
if (!IsSqlCondition(exp))
{
return(exp);
}
var result = new CaseExpression(new[] { new When(exp, new SqlConstantExpression(true)) }, new SqlConstantExpression(false));
return(exp.Type.IsNullable() ? result.Nullify() : result);
}
protected override Expression VisitCase(CaseExpression caseExpression)
{
Check.NotNull(caseExpression, nameof(caseExpression));
var parentOptimize = _optimize;
var testIsCondition = caseExpression.Operand == null;
_optimize = false;
var operand = (SqlExpression)Visit(caseExpression.Operand);
var whenClauses = new List <CaseWhenClause>();
foreach (var whenClause in caseExpression.WhenClauses)
{
_optimize = testIsCondition;
var test = (SqlExpression)Visit(whenClause.Test);
_optimize = false;
var result = (SqlExpression)Visit(whenClause.Result);
whenClauses.Add(new CaseWhenClause(test, result));
}
_optimize = false;
var elseResult = (SqlExpression)Visit(caseExpression.ElseResult);
_optimize = parentOptimize;
return(ApplyConversion(caseExpression.Update(operand, whenClauses, elseResult), condition: false));
}
Expression MakeSqlValue(Expression exp)
{
if (exp == null)
return null;
if (!inSql || !IsBooleanExpression(exp))
return exp;
if (exp.NodeType == ExpressionType.Constant)
{
switch (((bool?)((ConstantExpression)exp).Value))
{
case false: return new SqlConstantExpression(0, exp.Type);
case true: return new SqlConstantExpression(1, exp.Type);
case null: return new SqlConstantExpression(null, exp.Type);
}
throw new InvalidOperationException("Entity");
}
if (!IsSqlCondition(exp))
return exp;
var result = new CaseExpression(new[] { new When(exp, new SqlConstantExpression(true)) }, new SqlConstantExpression(false));
return exp.Type.IsNullable() ? result.Nullify() : result;
}
protected internal override Expression VisitCase(CaseExpression cex)
{
AppendNewLine(Indentation.Inner);
sb.Append("CASE");
AppendNewLine(Indentation.Inner);
for (int i = 0, n = cex.Whens.Count; i < n; i++)
{
When when = cex.Whens[i];
sb.Append("WHEN ");
Visit(when.Condition);
sb.Append(" THEN ");
Visit(when.Value);
AppendNewLine(Indentation.Same);
}
if (cex.DefaultValue != null)
{
sb.Append("ELSE ");
Visit(cex.DefaultValue);
AppendNewLine(Indentation.Outer);
}
sb.Append("END");
AppendNewLine(Indentation.Outer);
return(cex);
}
protected override Expression VisitCase(CaseExpression caseExpression)
{
var parentSearchCondition = _isSearchCondition;
var testIsCondition = caseExpression.Operand == null;
_isSearchCondition = false;
var operand = (SqlExpression)Visit(caseExpression.Operand);
var whenClauses = new List <CaseWhenClause>();
foreach (var whenClause in caseExpression.WhenClauses)
{
_isSearchCondition = testIsCondition;
var test = (SqlExpression)Visit(whenClause.Test);
_isSearchCondition = false;
var result = (SqlExpression)Visit(whenClause.Result);
whenClauses.Add(new CaseWhenClause(test, result));
}
_isSearchCondition = false;
var elseResult = (SqlExpression)Visit(caseExpression.ElseResult);
_isSearchCondition = parentSearchCondition;
return(ApplyConversion(caseExpression.Update(operand, whenClauses, elseResult), condition: false));
}
private ISqlElement GetFieldExpression(QueryField field, SelectClause selectClause)
{
if (field.properties.Length < 1)
{
throw new InvalidOperationException("assertion failure");
}
if (field.properties.Length == 1)
{
return(GetPropertyReference(field.properties[0], selectClause));
}
var result = new CaseExpression();
var eqConditions = new List <ISqlElement>();
foreach (var property in field.properties)
{
eqConditions.Clear();
var entity = property.referer;
while (entity != null)
{
if (entity.unionCondition != null)
{
eqConditions.Add(entity.unionCondition);
}
entity = entity.referer == null ? null : entity.referer.referer;
}
result.Elements.Add(new CaseElement
{
Value = GetPropertyReference(property, selectClause),
Condition = eqConditions.Combine()
});
}
return(result);
}
public async Task TestCaseExpression()
{
var config = new MustacheConfigSchema()
{
Params = new List <Param>
{
new Param {
Name = "MySql", DefaultValue = "true"
},
new Param {
Name = "MySqlEFCore", DefaultValue = "false"
},
new Param {
Name = "C", DefaultValue = "false"
},
},
};
var dv = new Dictionary <string, string>
{
{ "TargetFrameworkVersion", "netcoreapp2.2" },
};
var calcParam = new CalculatedParam
{
Name = "AspNetCoreVersion",
Expression = "TargetFrameworkVersion,netcoreapp2.2=2.2.0,netcoreapp2.1=2.1.1,default=False",
ExpressionType = ExpressionTypeEnum.Case,
};
var expression = new CaseExpression(_logger, calcParam, config);
var result = await expression.EvaluateExpressionAsync(dv);
Assert.Equal("2.2.0", result);
}
/*
* BNF:
* <case expression> ::=
* case [<expression>]
* <ne case item expression commalist>
* else <expression>
* end
*
* <case item expression> ::=
* when <expression> then <expression>
*/
protected CaseExpression CaseExpression(Lexer lexer)
{
lexer.NextToken().CheckSymbol(Keywords.Case);
CaseExpression caseExpression = new CaseExpression();
if (!(lexer.PeekTokenSymbol(1) == Keywords.When))
{
caseExpression.Expression = Expression(lexer);
}
bool done = false;
do
{
caseExpression.CaseItems.Add(CaseItemExpression(lexer));
switch (lexer[1].AsSymbol)
{
case Keywords.When: break;
case Keywords.Else:
caseExpression.ElseExpression = CaseElseExpression(lexer);
done = true;
break;
default: throw new ParserException(ParserException.Codes.CaseItemExpressionExpected);
}
}while (!done);
lexer.NextToken().CheckSymbol(Keywords.End);
return(caseExpression);
}
public void Visit(CaseExpression statement)
{
var arg = VisitChild(statement.Expression);
_codeStack.Peek().Tag = arg.Tag;
_codeStack.Peek().CodeExpression = arg.CodeExpression;
}
private SqlExpression OptimizeCompareTo(
SqlBinaryExpression sqlBinaryExpression,
int intValue,
CaseExpression caseExpression)
{
var testLeft = ((SqlBinaryExpression)caseExpression.WhenClauses[0].Test).Left;
var testRight = ((SqlBinaryExpression)caseExpression.WhenClauses[0].Test).Right;
var operatorType = sqlBinaryExpression.Right is SqlConstantExpression
? sqlBinaryExpression.OperatorType
: sqlBinaryExpression.OperatorType switch
{
ExpressionType.GreaterThan => ExpressionType.LessThan,
ExpressionType.GreaterThanOrEqual => ExpressionType.LessThanOrEqual,
ExpressionType.LessThan => ExpressionType.GreaterThan,
ExpressionType.LessThanOrEqual => ExpressionType.GreaterThanOrEqual,
_ => sqlBinaryExpression.OperatorType
};
switch (operatorType)
{
// CompareTo(a, b) != 0 -> a != b
// CompareTo(a, b) != 1 -> a <= b
// CompareTo(a, b) != -1 -> a >= b
case ExpressionType.NotEqual:
return((SqlExpression)Visit(intValue switch
{
0 => _sqlExpressionFactory.NotEqual(testLeft, testRight),
1 => _sqlExpressionFactory.LessThanOrEqual(testLeft, testRight),
_ => _sqlExpressionFactory.GreaterThanOrEqual(testLeft, testRight),
}));
public override void Accept(MatchExpression match)
{
AstNode value = match.Children [0];
value.Visit(this);
int temporary = methodBuilder.CreateTemporary();
methodBuilder.EmitInstruction(match.Location, Opcode.StoreLocal, temporary);
PatternCompiler compiler = new PatternCompiler(symbolTable, methodBuilder,
temporary,
this);
IodineLabel nextLabel = methodBuilder.CreateLabel();
IodineLabel endLabel = methodBuilder.CreateLabel();
for (int i = 1; i < match.Children.Count; i++)
{
if (i > 1)
{
methodBuilder.MarkLabelPosition(nextLabel);
nextLabel = methodBuilder.CreateLabel();
}
CaseExpression clause = match.Children [i] as CaseExpression;
clause.Pattern.Visit(compiler);
methodBuilder.EmitInstruction(match.Location, Opcode.JumpIfFalse, nextLabel);
if (clause.Condition != null)
{
clause.Condition.Visit(this);
methodBuilder.EmitInstruction(match.Location, Opcode.JumpIfFalse, nextLabel);
}
clause.Value.Visit(this);
methodBuilder.EmitInstruction(match.Location, Opcode.Jump, endLabel);
}
methodBuilder.MarkLabelPosition(endLabel);
}
private bool IsCompareTo(CaseExpression caseExpression)
{
if (caseExpression != null &&
caseExpression.Operand == null &&
caseExpression.ElseResult == null &&
caseExpression.WhenClauses.Count == 3 &&
caseExpression.WhenClauses.All(c => c.Test is SqlBinaryExpression &&
c.Result is SqlConstantExpression constant &&
constant.Value is int))
{
var whenClauses = caseExpression.WhenClauses.Select(c => new
{
test = (SqlBinaryExpression)c.Test,
resultValue = (int)((SqlConstantExpression)c.Result).Value
}).ToList();
if (whenClauses[0].test.Left.Equals(whenClauses[1].test.Left) &&
whenClauses[1].test.Left.Equals(whenClauses[2].test.Left) &&
whenClauses[0].test.Right.Equals(whenClauses[1].test.Right) &&
whenClauses[1].test.Right.Equals(whenClauses[2].test.Right) &&
whenClauses[0].test.OperatorType == ExpressionType.Equal &&
whenClauses[1].test.OperatorType == ExpressionType.GreaterThan &&
whenClauses[2].test.OperatorType == ExpressionType.LessThan &&
whenClauses[0].resultValue == 0 &&
whenClauses[1].resultValue == 1 &&
whenClauses[2].resultValue == -1)
{
return(true);
}
}
return(false);
}
protected override Expression VisitCase(CaseExpression caseExpression)
{
Check.NotNull(caseExpression, nameof(caseExpression));
_isNullable = false;
// if there is no 'else' there is a possibility of null, when none of the conditions are met
// otherwise the result is nullable if any of the WhenClause results OR ElseResult is nullable
var isNullable = caseExpression.ElseResult == null;
var canOptimize = _canOptimize;
var testIsCondition = caseExpression.Operand == null;
_canOptimize = false;
var newOperand = (SqlExpression)Visit(caseExpression.Operand);
var newWhenClauses = new List <CaseWhenClause>();
foreach (var whenClause in caseExpression.WhenClauses)
{
_canOptimize = testIsCondition;
var newTest = (SqlExpression)Visit(whenClause.Test);
_canOptimize = false;
_isNullable = false;
var newResult = (SqlExpression)Visit(whenClause.Result);
isNullable |= _isNullable;
newWhenClauses.Add(new CaseWhenClause(newTest, newResult));
}
_canOptimize = false;
var newElseResult = (SqlExpression)Visit(caseExpression.ElseResult);
_isNullable |= isNullable;
_canOptimize = canOptimize;
return(caseExpression.Update(newOperand, newWhenClauses, newElseResult));
}
protected string FormatCaseElseExpression(int offset, CaseExpression caseSwitch)
{
StringBuilder sql = new StringBuilder(GetIndent(true) + "ELSE");
using (new IndentScope(this))
{
sql.Append(GetIndent(true) + caseSwitch.Else.FormattedValue(offset, this));
}
return(sql.ToString());
}
public override void Accept(CaseExpression caseExpr)
{
PatternAnalyzer analyzer = new PatternAnalyzer(errorLog, symbolTable, this);
caseExpr.Pattern.Visit(analyzer);
if (caseExpr.Condition != null)
{
caseExpr.Condition.Visit(this);
}
caseExpr.Value.Visit(this);
}
protected internal virtual Expression VisitCase(CaseExpression cex)
{
var newWhens = Visit(cex.Whens, w => VisitWhen(w));
var newDefault = Visit(cex.DefaultValue);
if (newWhens != cex.Whens || newDefault != cex.DefaultValue)
{
return(new CaseExpression(newWhens, newDefault));
}
return(cex);
}
public virtual CaseExpression VisitCase(CaseExpression expression)
{
foreach (var element in expression.Elements)
{
element.Condition = Visit(element.Condition);
element.Value = Visit(element.Value);
}
if (expression.DefaultValue != null)
{
expression.DefaultValue = Visit(expression.DefaultValue);
}
return(expression);
}
public virtual Expression VisitCaseExpression(CaseExpression caseExpression)
{
_sql.AppendLine("CASE WHEN (");
using (_sql.Indent())
{
VisitExpression(caseExpression.When);
}
_sql.Append(") THEN CAST(1 AS BIT) ELSE CAST(0 AS BIT) END");
return(caseExpression);
}
protected override Expression VisitExtension(Expression extensionExpression)
{
Check.NotNull(extensionExpression, nameof(extensionExpression));
return(extensionExpression switch
{
ShapedQueryExpression shapedQueryExpression => VisitShapedQueryExpression(shapedQueryExpression),
CaseExpression caseExpression => VisitCase(caseExpression),
SelectExpression selectExpression => VisitSelect(selectExpression),
InnerJoinExpression innerJoinExpression => VisitInnerJoin(innerJoinExpression),
LeftJoinExpression leftJoinExpression => VisitLeftJoin(leftJoinExpression),
_ => base.VisitExtension(extensionExpression),
});
protected override Expression VisitCase(CaseExpression caseExpression)
{
Visit(caseExpression.Operand);
foreach (var whenClause in caseExpression.WhenClauses)
{
Visit(whenClause.Test);
Visit(whenClause.Result);
}
if (caseExpression.ElseResult != null)
{
Visit(caseExpression.ElseResult);
}
return(caseExpression);
}
public bool isCatched(string value, SwitchCaseExpression sce, bool preCatch)
{
if (sce is CaseExpression)
{
CaseExpression cExp = (CaseExpression)sce;
if (cExp.next == null)
{
if (preCatch)
{
evalExpression(cExp.body);
return(true);
}
//if (!cExp.literal.value.stringValue.Equals(value) && !preCatch)
if (!cExp.literal.value.stringValue.Equals(value))
{
return(false);
}
else
{
evalExpression(cExp.body);
return(true);
}
}
else
{
if (preCatch)
{
return(isCatched(value, cExp.next, preCatch));
}
if (cExp.literal.value.stringValue.Equals(value))
{
return(isCatched(value, cExp.next, true));
}
return(isCatched(value, cExp.next, preCatch));
}
}
else if (sce is DefaultExpression)
{
evalExpression(((DefaultExpression)sce).body);
return(true);
}
return(false);
}
private SqlExpression ApplyTypeMappingOnCase(
CaseExpression caseExpression, RelationalTypeMapping typeMapping)
{
var whenClauses = new List<CaseWhenClause>();
foreach (var caseWhenClause in caseExpression.WhenClauses)
{
whenClauses.Add(
new CaseWhenClause(
caseWhenClause.Test,
ApplyTypeMapping(caseWhenClause.Result, typeMapping)));
}
var elseResult = ApplyTypeMapping(caseExpression.ElseResult, typeMapping);
return caseExpression.Update(caseExpression.Operand, whenClauses, elseResult);
}
public bool isCatched(int value, SwitchCaseExpression sce, bool preCatch)
{
if (sce is CaseExpression)
{
CaseExpression cExp = (CaseExpression)sce;
if (cExp.next == null)
{
if (preCatch)
{
evalExpression(cExp.body);
return(true);
}
if (cExp.literal.value.intValue != value && !preCatch)
{
return(false);
}
else
{
evalExpression(cExp.body);
return(true);
}
}
else
{
if (preCatch)
{
return(isCatched(value, cExp.next, preCatch));
}
if (cExp.literal.value.intValue == value)
{
return(isCatched(value, cExp.next, true));
}
return(isCatched(value, cExp.next, preCatch));
}
}
else if (sce is DefaultExpression)
{
evalExpression(((DefaultExpression)sce).body);
return(true);
}
return(false);
}
public override void Compile(Compiler compiler, Node node, NodeParent parent)
{
CaseExpression c = (CaseExpression)node;
compiler.CompileNode(c.Value, parent.CreateChild(node));
compiler.AppendLine("$_caseval = array_pop($_stack);");
foreach (var when in c.WhenClauses)
{
var sb = new StringBuilder();
compiler.AppendLine("$_comparisons = array();");
foreach (var compar in when.Comparisons)
{
if (sb.Length > 0)
{
sb.Append(" || ");
}
sb.Append("_isTruthy(array_pop($_comparisons))");
compiler.CompileNode(compar, parent.CreateChild(node).CreateChild(when));
compiler.AppendLine("$_comparisons[] = array_pop($_stack)->__operator_stricteq(NULL, $_caseval);");
}
compiler.AppendLine("if({0})", sb.ToString());
compiler.AppendLine("{");
compiler.Indent();
foreach (var stmt in when.Statements)
{
compiler.CompileNode(stmt, parent.CreateChild(node).CreateChild(when));
}
compiler.Dedent();
compiler.AppendLine("}");
compiler.AppendLine("else");
compiler.AppendLine("{");
compiler.Indent();
}
if (c.ElseStatements != null)
{
foreach (var stmt in c.ElseStatements)
{
compiler.CompileNode(stmt, parent.CreateChild(node));
}
}
for (int i = 0; i < c.WhenClauses.Length; i++)
{
compiler.Dedent();
compiler.AppendLine("}");
}
}
private static WhenClause MatchingClause(CaseExpression expr, IArgument arg, Scope scope)
{
switch (expr)
{
case SimpleCaseExpression simple:
var input = Evaluate(simple.InputExpression, arg, scope);
return(simple.WhenClauses
.FirstOrDefault(x => Equality.Equal(input, Evaluate(x.WhenExpression, arg, scope))));
case SearchedCaseExpression searched:
return(searched.WhenClauses
.FirstOrDefault(x => Evaluate(x.WhenExpression, arg, scope)));
default:
throw FeatureNotSupportedException.Subtype(expr);
}
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public virtual Expression Translate(MethodCallExpression methodCallExpression)
{
var method = methodCallExpression.Method.OnInterface(typeof(IGeometry));
if (_methodToFunctionName.TryGetValue(method, out var functionName))
{
Expression newExpression = new SqlFunctionExpression(
functionName,
methodCallExpression.Type,
new[] { methodCallExpression.Object }.Concat(methodCallExpression.Arguments));
if (methodCallExpression.Type == typeof(bool))
{
newExpression = new CaseExpression(
new CaseWhenClause(
Expression.Not(new IsNullExpression(methodCallExpression.Object)),
newExpression));
}
return(newExpression);
}
if (Equals(method, _getGeometryN))
{
return(new SqlFunctionExpression(
"GeometryN",
methodCallExpression.Type,
new[]
{
methodCallExpression.Object,
Expression.Add(methodCallExpression.Arguments[0], Expression.Constant(1))
}));
}
if (Equals(method, _isWithinDistance))
{
return(Expression.LessThanOrEqual(
new SqlFunctionExpression(
"Distance",
typeof(double),
new[] { methodCallExpression.Object, methodCallExpression.Arguments[0] }),
methodCallExpression.Arguments[1]));
}
return(null);
}
public override CaseExpression VisitCase(CaseExpression expression)
{
builder.Append("case");
foreach (var e in expression.Elements)
{
builder.Append("\r\n\t");
builder.Append("when ");
Visit(e.Condition);
builder.Append(" then ");
Visit(e.Value);
}
if (expression.DefaultValue != null)
{
builder.Append("\r\n\t");
builder.Append("else ");
Visit(expression.DefaultValue);
}
builder.Append("\r\nend");
return(expression);
}
public virtual SqlExpression ApplyTypeMapping(SqlExpression sqlExpression, RelationalTypeMapping typeMapping)
{
if (sqlExpression == null ||
sqlExpression.TypeMapping != null)
{
return(sqlExpression);
}
return(sqlExpression switch
{
CaseExpression e => ApplyTypeMappingOnCase(e, typeMapping),
LikeExpression e => ApplyTypeMappingOnLike(e),
SqlBinaryExpression e => ApplyTypeMappingOnSqlBinary(e, typeMapping),
SqlUnaryExpression e => ApplyTypeMappingOnSqlUnary(e, typeMapping),
SqlConstantExpression e => e.ApplyTypeMapping(typeMapping),
SqlFragmentExpression e => e,
SqlFunctionExpression e => e.ApplyTypeMapping(typeMapping),
SqlParameterExpression e => e.ApplyTypeMapping(typeMapping),
_ => sqlExpression
});
private IDictionary <string, IExpression> GetEvaluationExpressions(MustacheConfigSchema schema)
{
var evalExpressions = new Dictionary <string, IExpression>();
foreach (var calculatedParam in schema.CalculatedParams)
{
IExpression expression = null;
switch (calculatedParam.ExpressionType)
{
case ExpressionTypeEnum.Any:
expression = new AnyExpression(_logger, calculatedParam, schema);
break;
case ExpressionTypeEnum.Bool:
expression = new BooleanExpression(_logger, calculatedParam, schema);
break;
case ExpressionTypeEnum.Case:
expression = new CaseExpression(_logger, calculatedParam, schema);
break;
case ExpressionTypeEnum.String:
expression = new CaseExpression(_logger, calculatedParam, schema);
break;
case ExpressionTypeEnum.MoreThanOne:
expression = new MoreThanOneExpression(_logger, calculatedParam, schema);
break;
default:
throw new InvalidEnumArgumentException("Calculated Expression", (int)calculatedParam.ExpressionType, typeof(ExpressionTypeEnum));
}
if (expression != null)
{
evalExpressions.Add(calculatedParam.Name, expression);
}
}
return(evalExpressions);
}
public void addCase(SwitchCaseExpression ce)
{
if (cases == null)
{
cases = new List <SwitchCaseExpression>();
}
cases.Add(ce);
if (ce is DefaultExpression)
{
hasDefaultCase = true;
return;
}
if (ce is CaseExpression)
{
SwitchCaseExpression tmp = ce;
while (tmp != null)
{
if (tmp is DefaultExpression)
{
hasDefaultCase = true;
return;
}
else
{
CaseExpression caseExp = (CaseExpression)tmp;
if (intCases == null)
{
intCases = new List <int>();
}
intCases.Add(caseExp.literal.value.intValue);
tmp = caseExp.next;
}
}
}
}
protected override Expression VisitCase(CaseExpression caseExpression)
{
caseExpression.ThrowIfNull(nameof(caseExpression));
Sql.Append("ICASE(");
if (caseExpression.Operand != null)
{
Sql.Append(" ");
Visit(caseExpression.Operand);
}
var first = true;
foreach (var whenClause in caseExpression.WhenClauses)
{
if (first)
{
first = false;
}
else
{
Sql.Append(",");
}
Visit(whenClause.Test);
Sql.Append(",");
Visit(whenClause.Result);
}
if (caseExpression.ElseResult != null)
{
Sql.Append(",");
Visit(caseExpression.ElseResult);
}
Sql.Append(")");
return(caseExpression);
}
protected override Expression VisitCase(CaseExpression cex)
{
AppendNewLine(Indentation.Inner);
sb.Append("CASE");
AppendNewLine(Indentation.Inner);
for (int i = 0, n = cex.Whens.Count; i < n; i++)
{
When when = cex.Whens[i];
sb.Append("WHEN ");
Visit(when.Condition);
sb.Append(" THEN ");
Visit(when.Value);
AppendNewLine(Indentation.Same);
}
if (cex.DefaultValue != null)
{
sb.Append("ELSE ");
Visit(cex.DefaultValue);
AppendNewLine(Indentation.Outer);
}
sb.Append("END");
AppendNewLine(Indentation.Outer);
return cex;
}
protected virtual Expression VisitCase(CaseExpression cex)
{
var newWhens = cex.Whens.NewIfChange(w => VisitWhen(w));
var newDefault = Visit(cex.DefaultValue);
if (newWhens != cex.Whens || newDefault != cex.DefaultValue)
return new CaseExpression(newWhens, newDefault);
return cex;
}
protected override Expression VisitCase(CaseExpression cex)
{
var newWhens = cex.Whens.NewIfChange(w => VisitWhen(w));
var newDefault = MakeSqlValue(Visit(cex.DefaultValue));
if (newWhens != cex.Whens || newDefault != cex.DefaultValue)
return new CaseExpression(newWhens, newDefault);
return cex;
}
public override void ExplicitVisit(CaseExpression fragment)
{
_fragments.Add(fragment);
}
public override void ExplicitVisit(CaseExpression node) { this.action(node); }