public bool TryProcess(Expression expression, ScriptParameterDictionary parameters, out string result)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (expression is ConstantExpression constantExpression)
{
var parameterKey = parameters.AddNext(constantExpression.Value);
result = $"args.{parameterKey}";
return(true);
}
result = default;
return(false);
}
public bool TryProcess(MethodCallExpression methodCallExpression, ScriptParameterDictionary parameters, out string result)
{
if (methodCallExpression == null)
{
throw new ArgumentNullException(nameof(methodCallExpression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (methodCallExpression.Method.DeclaringType != typeof(Enumerable))
{
result = default;
return(false);
}
foreach (var processor in expressionProcessors)
{
if (processor.TryProcess(methodCallExpression, parameters, out result))
{
return(true);
}
}
result = default;
return(false);
}
public bool TryProcess(Expression expression, ScriptParameterDictionary parameters, out string result)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
var lambdaExpression = expression as LambdaExpression;
if (lambdaExpression == null)
{
result = default;
return(false);
}
var parameterList = string.Join(", ", lambdaExpression.Parameters.Select(p => p.Name));
var body = _expressionProcessorPipeline.ProcessExpression(lambdaExpression.Body, parameters);
// TODO: Consider whether "return" is always correct (technically we can return void stuff in JS but what if
result = $"function({parameterList}) {{ return {body}; }}";
return(true);
}
public bool TryProcess(Expression expression, ScriptParameterDictionary parameters, out string result)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (expression.NodeType != ExpressionType.MemberAccess)
{
result = default;
return(false);
}
foreach (var processor in expressionProcessors)
{
if (processor.TryProcess((MemberExpression)expression, parameters, out result))
{
return(true);
}
}
result = default;
return(false);
}
public bool TryProcess(Expression expression, ScriptParameterDictionary parameters, out string result)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (expression is ConditionalExpression conditionalExpression)
{
var test = _expressionProcessorPipeline.ProcessExpression(conditionalExpression.Test, parameters);
var ifTrue = _expressionProcessorPipeline.ProcessExpression(conditionalExpression.IfTrue, parameters);
var ifFalse = _expressionProcessorPipeline.ProcessExpression(conditionalExpression.IfFalse, parameters);
result = $"({test} ? {ifTrue} : {ifFalse})";
return(true);
}
result = default;
return(false);
}
public bool TryProcess(MethodCallExpression methodCallExpression, ScriptParameterDictionary parameters, out string result)
{
if (methodCallExpression == null)
{
throw new ArgumentNullException(nameof(methodCallExpression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (TryProcessPredicatelessAny(methodCallExpression, parameters, out result))
{
return(true);
}
if (TryProcessPredicatedAny(methodCallExpression, parameters, out result))
{
return(true);
}
result = default;
return(false);
}
public bool TryProcess(MethodCallExpression methodCallExpression, ScriptParameterDictionary parameters, out string result)
{
if (methodCallExpression == null)
{
throw new ArgumentNullException(nameof(methodCallExpression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (!integralTypes.Contains(methodCallExpression.Method.DeclaringType))
{
result = default;
return(false);
}
if (methodCallExpression.Method.Name == ToStringMethodName)
{
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(methodCallExpression.Object, parameters);
result = $"{ownerExpressionString}.toString()";
return(true);
}
result = default;
return(false);
}
public bool TryProcess(MemberExpression memberExpression, ScriptParameterDictionary parameters, out string result)
{
if (memberExpression == null)
{
throw new ArgumentNullException(nameof(memberExpression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
// TODO: Tests
if (memberExpression.Member is PropertyInfo propertyInfo)
{
if (IsDictionaryCountAccess(propertyInfo))
{
// Dictionaries are mapped to object literals based on their keys when they are serialized to JSON,
// so we can't use the .length as we would with a regular collection. But there are as many items
// in a dictionary as there are keys, so we need find the number of keys to resolve the expression.
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(memberExpression.Expression, parameters);
// TODO: Check whether RavenDB provides a magic property for Dictionary key collections.
result = $"Object.keys({ownerExpressionString}).length";
return(true);
}
if (IsDictionaryKeysCollectionCountAccess(memberExpression, propertyInfo))
{
// We need to navigate one level further up (i.e. doc.MyDictionary.Keys becomes doc.MyDictionary)
// because dictionaries are mapped to object literals with the respective keys when they become
// JSON, so the Keys segment becomes invalid.
var parentMemberExpression = ((MemberExpression)memberExpression.Expression).Expression;
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(parentMemberExpression, parameters);
// TODO: Check whether RavenDB provides a magic property for Dictionary key collections.
result = $"Object.keys({ownerExpressionString}).length";
return(true);
}
if (IsDictionaryValuesCollectionCountAccess(memberExpression, propertyInfo))
{
// We need to navigate one level further up (i.e. doc.MyDictionary.Values becomes doc.MyDictionary)
// because dictionaries are mapped to object literals with the respective keys when they become
// JSON, so the Values segment becomes invalid.
var parentMemberExpression = ((MemberExpression)memberExpression.Expression).Expression;
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(parentMemberExpression, parameters);
// TODO: Check whether RavenDB provides a magic property for Dictionary value collections.
result = $"Object.values({ownerExpressionString}).length";
return(true);
}
}
result = default;
return(false);
}
private (string script, ScriptParameterDictionary parameters) GetParsedJavaScript(Expression <Func <TestDocument, bool> > expression)
{
var patchScriptConditionBuilder = PatchScriptConditionBuilderFactory.CreatePatchScriptBodyBuilder();
var parameters = new ScriptParameterDictionary();
var script = patchScriptConditionBuilder.CreateScriptCondition(expression, parameters);
return(script, parameters);
}
private static void PrintCondition(Expression <Func <TestDocument, bool> > expression)
{
var originalColor = Console.ForegroundColor;
Console.ForegroundColor = ConsoleColor.Magenta;
Console.WriteLine("***********************************************************************************");
Console.WriteLine("C# Expression:");
Console.Write("\t");
Console.WriteLine(expression.ToString());
Console.WriteLine();
var parameters = new ScriptParameterDictionary();
var script = patchScriptConditionBuilder.CreateScriptCondition(expression, parameters);
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine("Created JavaScript expression:");
Console.Write("\t");
Console.WriteLine(script);
Console.WriteLine();
Console.ForegroundColor = ConsoleColor.DarkCyan;
Console.WriteLine("Parameters:");
foreach (var parameter in parameters)
{
Console.Write("\t");
string value;
if (parameter.Value is string || parameter.Value is char)
{
value = '"' + parameter.Value.ToString().Replace("\"", "\\\"") + '"';
}
else if (parameter.Value == null)
{
value = "null";
}
else
{
value = parameter.Value.ToString();
}
Console.WriteLine($"{parameter.Key}: {value}");
}
Console.WriteLine();
Console.ForegroundColor = originalColor;
Console.WriteLine();
}
public void BinaryOps_Integers_SubtractAssign()
{
var memberExpression = LambdaExpression(doc => doc.SomeInt).Body;
var constantExpression = Expression.Constant(1);
var expression = Expression.SubtractAssign(memberExpression, constantExpression);
var parameters = new ScriptParameterDictionary();
var result = expressionProcessorPipeline.ProcessExpression(expression, parameters);
Assert.AreEqual(
"(doc.SomeInt -= args.__param1)",
result);
Assert.AreEqual(1, parameters.Count);
Assert.AreEqual(1, parameters["__param1"]);
}
public string ProcessExpression(Expression expression, ScriptParameterDictionary parameters)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
var simplifiedExpression = _expressionSimplifierPipeline.ProcessExpression(expression);
foreach (var processor in _expressionProcessors)
{
if (processor.TryProcess(simplifiedExpression, parameters, out var result))
{
return(result);
}
}
throw new NotSupportedException($"Cannot handle expression of type {expression.GetType().FullName}.");
}
public bool TryProcess(MemberExpression memberExpression, ScriptParameterDictionary parameters, out string result)
{
if (memberExpression == null)
{
throw new ArgumentNullException(nameof(memberExpression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (memberExpression.Member is PropertyInfo propertyInfo)
{
var memberOwnerType = propertyInfo.DeclaringType;
if (memberOwnerType.IsGenericType)
{
memberOwnerType = memberOwnerType.GetGenericTypeDefinition();
}
if (memberOwnerType == NullableType)
{
if (propertyInfo.Name == "HasValue")
{
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(memberExpression.Expression, parameters);
result = $"({ownerExpressionString} != null)";
return(true);
}
if (propertyInfo.Name == "Value")
{
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(memberExpression.Expression, parameters);
result = $"{ownerExpressionString}";
return(true);
}
}
}
result = default;
return(false);
}
public bool TryProcess(MemberExpression memberExpression, ScriptParameterDictionary parameters, out string result)
{
if (memberExpression == null)
{
throw new ArgumentNullException(nameof(memberExpression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(memberExpression.Expression, parameters);
// TODO: Consider cases when the property is called differently in the document than in the object model. Check out
// Raven.Client.Documents.Linq.LinqPathProvider, maybe that can solve it out-of-the-box.
result = $"{ownerExpressionString}.{memberExpression.Member.Name}";
return(true);
}
public bool TryProcess(MethodCallExpression methodCallExpression, ScriptParameterDictionary parameters, out string result)
{
if (methodCallExpression == null)
{
throw new ArgumentNullException(nameof(methodCallExpression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (methodCallExpression.Method.DeclaringType != StringType)
{
result = default;
return(false);
}
return(methodCallExpression.Object == null
? TryProcessStaticStringMethodInvocation(methodCallExpression, methodCallExpression.Method, parameters, out result)
: TryProcessNonStaticStringMethodInvocation(methodCallExpression, methodCallExpression.Method, parameters, out result));
}
public bool TryProcess(MemberExpression memberExpression, ScriptParameterDictionary parameters, out string result)
{
if (memberExpression == null)
{
throw new ArgumentNullException(nameof(memberExpression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (memberExpression.Member is PropertyInfo propertyInfo && propertyInfo == NonStatic_Length)
{
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(memberExpression.Expression, parameters);
result = $"{ownerExpressionString}.length";
return(true);
}
result = default;
return(false);
}
public bool TryProcess(Expression expression, ScriptParameterDictionary parameters, out string result)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
if (expression is ParameterExpression parameterExpression)
{
result = parameterExpression.Name;
return(true);
}
result = default;
return(false);
}
public bool TryProcess(MemberExpression memberExpression, ScriptParameterDictionary parameters, out string result)
{
if (memberExpression == null)
{
throw new ArgumentNullException(nameof(memberExpression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
// TODO: Tests
if (memberExpression.Member is PropertyInfo propertyInfo && IsSpeciallyTreatedCountPropertyAccess(propertyInfo))
{
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(memberExpression.Expression, parameters);
result = $"{ownerExpressionString}.length";
return(true);
}
result = default;
return(false);
}
private bool TryProcessNonStaticStringMethodInvocation(MethodCallExpression methodCallExpression, MethodInfo methodInfo, ScriptParameterDictionary parameters, out string result)
{
// Methods to implement:
// indexof, lastindexof, replace (!must do with "/chars/g", but must escape regex control characters!), split, equals, compareTo
var argumentList = new List <string>();
string mappedMethodName = null;
if (methodInfo == NonStatic_Contains_Char || methodInfo == NonStatic_Contains_String)
{
var searchInValue = _expressionProcessorPipeline.ProcessExpression(methodCallExpression.Object, parameters);
var searchForValueExpression = methodCallExpression.Arguments[0];
var searchForValue = _expressionProcessorPipeline.ProcessExpression(searchForValueExpression, parameters);
result = $"({searchInValue}.indexOf({searchForValue}) != -1)";
return(true);
}
else if (methodInfo == NonStatic_Insert)
{
var insertIntoValue = _expressionProcessorPipeline.ProcessExpression(methodCallExpression.Object, parameters);
var indexValueExpression = methodCallExpression.Arguments[0];
var indexValue = _expressionProcessorPipeline.ProcessExpression(indexValueExpression, parameters);
var insertValueExpression = methodCallExpression.Arguments[1];
var insertValue = _expressionProcessorPipeline.ProcessExpression(insertValueExpression, parameters);
result = $"({insertIntoValue}.substring(0, {indexValue}) + {insertValue} + {insertIntoValue}.substring({indexValue}))";
return(true);
}
else if (methodInfo == NonStatic_Remove_StartIndex)
{
mappedMethodName = "substring";
var startIndexValueExpression = methodCallExpression.Arguments[0];
var startIndexValue = _expressionProcessorPipeline.ProcessExpression(startIndexValueExpression, parameters);
argumentList.Add("0");
argumentList.Add(startIndexValue);
}
else if (methodInfo == NonStatic_Remove_StartIndex_Count)
{
var removeFromValue = _expressionProcessorPipeline.ProcessExpression(methodCallExpression.Object, parameters);
var firstSegmentStartIndexExpression = methodCallExpression.Arguments[0];
var firstSegmentStartIndexValue = _expressionProcessorPipeline.ProcessExpression(firstSegmentStartIndexExpression, parameters);
var countExpression = methodCallExpression.Arguments[1];
var secondSegmentStartIndexExpression = Expression.Add(firstSegmentStartIndexExpression, countExpression);
var secondSegmentStartIndexValue = _expressionProcessorPipeline.ProcessExpression(secondSegmentStartIndexExpression, parameters);
result = $"({removeFromValue}.substring(0, {firstSegmentStartIndexValue}) + {removeFromValue}.substring({secondSegmentStartIndexValue}))";
return(true);
}
else if (methodInfo == NonStatic_StartsWith_Value)
{
mappedMethodName = "startsWith";
var startWithValueExpression = methodCallExpression.Arguments[0];
var startWithValue = _expressionProcessorPipeline.ProcessExpression(startWithValueExpression, parameters);
argumentList.Add(startWithValue);
}
else if (methodInfo == NonStatic_EndsWith_Value)
{
mappedMethodName = "endsWith";
var startWithValueExpression = methodCallExpression.Arguments[0];
var startWithValue = _expressionProcessorPipeline.ProcessExpression(startWithValueExpression, parameters);
argumentList.Add(startWithValue);
}
else if (methodInfo == NonStatic_PadLeft_TotalWith || methodInfo == NonStatic_PadLeft_TotalWith_PaddingChar)
{
mappedMethodName = "padStart";
var totalWidthExpression = methodCallExpression.Arguments[0];
var totalWidth = _expressionProcessorPipeline.ProcessExpression(totalWidthExpression, parameters);
Expression paddingCharExpression = Expression.Constant(DefaultPaddingChar);
if (methodInfo == NonStatic_PadLeft_TotalWith_PaddingChar)
{
paddingCharExpression = methodCallExpression.Arguments[1];
}
var paddingChar = _expressionProcessorPipeline.ProcessExpression(paddingCharExpression, parameters);
argumentList.Add(totalWidth);
argumentList.Add(paddingChar);
}
else if (methodInfo == NonStatic_PadRight_TotalWith || methodInfo == NonStatic_PadRight_TotalWith_PaddingChar)
{
mappedMethodName = "padEnd";
var totalWidthExpression = methodCallExpression.Arguments[0];
var totalWidth = _expressionProcessorPipeline.ProcessExpression(totalWidthExpression, parameters);
Expression paddingCharExpression = Expression.Constant(DefaultPaddingChar);
if (methodInfo == NonStatic_PadRight_TotalWith_PaddingChar)
{
paddingCharExpression = methodCallExpression.Arguments[1];
}
var paddingChar = _expressionProcessorPipeline.ProcessExpression(paddingCharExpression, parameters);
argumentList.Add(totalWidth);
argumentList.Add(paddingChar);
}
else if (methodInfo == NonStatic_ToLower)
{
mappedMethodName = "toLowerCase";
}
else if (methodInfo == NonStatic_ToUpper)
{
mappedMethodName = "toUpperCase";
}
else if (methodInfo == NonStatic_TrimStart)
{
mappedMethodName = "trimStart";
}
else if (methodInfo == NonStatic_TrimEnd)
{
mappedMethodName = "trimEnd";
}
else if (methodInfo == NonStatic_Trim)
{
mappedMethodName = "trim";
}
else if (methodInfo == NonStatic_Substring_StartIndex)
{
mappedMethodName = "substring";
var startIndexExpression = methodCallExpression.Arguments[0];
var startIndex = _expressionProcessorPipeline.ProcessExpression(startIndexExpression, parameters);
argumentList.Add(startIndex);
}
else if (methodInfo == NonStatic_Substring_StartIndex_Length)
{
mappedMethodName = "substring";
var startIndexExpression = methodCallExpression.Arguments[0];
var lengthExpression = methodCallExpression.Arguments[1];
var startIndex = _expressionProcessorPipeline.ProcessExpression(startIndexExpression, parameters);
var length = _expressionProcessorPipeline.ProcessExpression(lengthExpression, parameters);
argumentList.Add(startIndex);
argumentList.Add(length);
}
else
{
result = default;
return(false);
}
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(methodCallExpression.Object, parameters);
var arguments = string.Join(", ", argumentList);
result = $"{ownerExpressionString}.{mappedMethodName}({arguments})";
return(true);
}
private bool TryProcessPredicatedAny(MethodCallExpression methodCallExpression, ScriptParameterDictionary parameters, out string result)
{
var invokedMethod = methodCallExpression.Method;
if (invokedMethod.IsGenericMethod)
{
invokedMethod = invokedMethod.GetGenericMethodDefinition();
}
if (invokedMethod == AnyExtensionWithPredicate)
{
// Since extensins are static, we must pass the first method invocation argument as the expression,
// not the methodCallExpression.Object (because that is null).
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(methodCallExpression.Arguments[0], parameters);
var predicate = (LambdaExpression)methodCallExpression.Arguments[1];
var jsPredicateFunction = _expressionProcessorPipeline.ProcessExpression(predicate, parameters);
if (IsInvokedOnDictionary(methodCallExpression))
{
// Ugly but simple. Could write a loop instead so we could terminate early if a match is found.
result = $"Object.keys({ownerExpressionString}).map(function(key) {{ return {{ Key: key, Value: {ownerExpressionString}[key] }}; }}).some({jsPredicateFunction})";
return(true);
}
result = $"({ownerExpressionString}).some({jsPredicateFunction})";
return(true);
}
result = default;
return(false);
}
private bool TryProcessPredicatelessAny(MethodCallExpression methodCallExpression, ScriptParameterDictionary parameters, out string result)
{
var invokedMethod = methodCallExpression.Method;
if (invokedMethod.IsGenericMethod)
{
invokedMethod = invokedMethod.GetGenericMethodDefinition();
}
if (invokedMethod == AnyExtensionWithoutPredicate)
{
// Since extensins are static, we must pass the first method invocation argument as the expression,
// not the methodCallExpression.Object (because that is null).
var ownerExpressionString = _expressionProcessorPipeline.ProcessExpression(methodCallExpression.Arguments[0], parameters);
if (IsInvokedOnDictionary(methodCallExpression))
{
result = $"Object.keys({ownerExpressionString}).length > 0";
return(true);
}
result = $"{ownerExpressionString}.length > 0";
return(true);
}
result = default;
return(false);
}
public bool TryProcess(Expression expression, ScriptParameterDictionary parameters, out string result)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
var binaryExpression = expression as BinaryExpression;
if (binaryExpression == null)
{
result = default;
return(false);
}
var operation = binaryExpression.NodeType;
var left = _expressionProcessorPipeline.ProcessExpression(binaryExpression.Left, parameters);
var right = _expressionProcessorPipeline.ProcessExpression(binaryExpression.Right, parameters);
switch (operation)
{
case ExpressionType.Add:
case ExpressionType.AddChecked:
result = $"({left} + {right})";
return(true);
case ExpressionType.And:
result = $"({left} & {right})";
return(true);
case ExpressionType.AndAlso:
result = $"({left} && {right})";
return(true);
case ExpressionType.ArrayIndex:
result = $"{left}[{right}]";
return(true);
case ExpressionType.Coalesce:
result = $"({left} != null ? {left} : {right})";
return(true);
case ExpressionType.Divide:
result = $"({left} / {right})";
return(true);
case ExpressionType.Equal:
result = $"({left} == {right})";
return(true);
case ExpressionType.ExclusiveOr:
result = $"({left} ^ {right})";
return(true);
case ExpressionType.GreaterThan:
result = $"({left} > {right})";
return(true);
case ExpressionType.GreaterThanOrEqual:
result = $"({left} >= {right})";
return(true);
case ExpressionType.LessThan:
result = $"({left} < {right})";
return(true);
case ExpressionType.LessThanOrEqual:
result = $"({left} <= {right})";
return(true);
case ExpressionType.Modulo:
result = $"({left} % {right})";
return(true);
case ExpressionType.Multiply:
case ExpressionType.MultiplyChecked:
result = $"({left} * {right})";
return(true);
case ExpressionType.NotEqual:
result = $"({left} != {right})";
return(true);
case ExpressionType.Or:
result = $"({left} | {right})";
return(true);
case ExpressionType.OrElse:
result = $"({left} || {right})";
return(true);
case ExpressionType.Subtract:
case ExpressionType.SubtractChecked:
result = $"({left} - {right})";
return(true);
case ExpressionType.Assign:
result = $"({left} = {right})";
return(true);
case ExpressionType.Index:
result = $"{left}[{right}]";
return(true);
case ExpressionType.AddAssign:
case ExpressionType.AddAssignChecked:
result = $"({left} += {right})";
return(true);
case ExpressionType.AndAssign:
result = $"({left} &= {right})";
return(true);
case ExpressionType.DivideAssign:
result = $"({left} /= {right})";
return(true);
case ExpressionType.ExclusiveOrAssign:
result = $"({left} ^= {right})";
return(true);
case ExpressionType.ModuloAssign:
result = $"({left} %= {right})";
return(true);
case ExpressionType.MultiplyAssign:
case ExpressionType.MultiplyAssignChecked:
result = $"({left} *= {right})";
return(true);
case ExpressionType.OrAssign:
result = $"({left} |= {right})";
return(true);
case ExpressionType.SubtractAssign:
case ExpressionType.SubtractAssignChecked:
result = $"({left} -= {right})";
return(true);
default:
result = default;
return(false);
}
}
private bool TryProcessStaticStringMethodInvocation(MethodCallExpression methodCallExpression, MethodInfo methodInfo, ScriptParameterDictionary parameters, out string result)
{
if (methodInfo == Static_IsNullOrEmpty)
{
var methodParameterExpression = methodCallExpression.Arguments[0];
var methodParameter = _expressionProcessorPipeline.ProcessExpression(methodParameterExpression, parameters);
result = $"({methodParameter} == null || {methodParameter} == '')";
return(true);
}
else if (methodInfo == Static_IsNullOrWhiteSpace)
{
var methodParameterExpression = methodCallExpression.Arguments[0];
var methodParameter = _expressionProcessorPipeline.ProcessExpression(methodParameterExpression, parameters);
result = $"({methodParameter} == null || {methodParameter}.trim() == '')";
return(true);
}
/*
* else if (methodInfo == Static_Concat)
* {
* }
* else if (methodInfo == Static_Join)
* {
* }
*/
result = null;
return(false);
}
public bool TryProcess(Expression expression, ScriptParameterDictionary parameters, out string result)
{
if (expression == null)
{
throw new ArgumentNullException(nameof(expression));
}
if (parameters == null)
{
throw new ArgumentNullException(nameof(parameters));
}
var unaryExpression = expression as UnaryExpression;
if (unaryExpression == null)
{
result = default;
return(false);
}
var operation = unaryExpression.NodeType;
var operand = _expressionProcessorPipeline.ProcessExpression(unaryExpression.Operand, parameters);
switch (operation)
{
case ExpressionType.ArrayLength:
result = $"{operand}.length";
return(true);
case ExpressionType.Convert:
result = operand;
return(true);
case ExpressionType.Negate:
result = $"-({operand})";
return(true);
case ExpressionType.UnaryPlus:
result = $"+({operand})";
return(true);
case ExpressionType.Not:
result = $"!({operand})";
return(true);
case ExpressionType.Decrement:
result = $"({operand} - 1)";
return(true);
case ExpressionType.Increment:
result = $"({operand} + 1)";
return(true);
case ExpressionType.PreIncrementAssign:
result = $"(++{operand})";
return(true);
case ExpressionType.PreDecrementAssign:
result = $"(--{operand})";
return(true);
case ExpressionType.PostIncrementAssign:
result = $"({operand}++)";
return(true);
case ExpressionType.PostDecrementAssign:
result = $"({operand}--)";
return(true);
default:
result = default;
return(false);
}
}
