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#region MIT license
//
// MIT license
//
// Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using DbLinq.Data.Linq.Sugar;
using DbLinq.Data.Linq.Sugar.ExpressionMutator;
using DbLinq.Data.Linq.Sugar.Expressions;
namespace DbLinq.Data.Linq.Sugar.Implementation
{
internal class SpecialExpressionTranslator : ISpecialExpressionTranslator
{
/// <summary>
/// Translate a hierarchy's SpecialExpressions to Expressions
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public Expression Translate(Expression expression)
{
return expression.Recurse(Analyzer);
}
protected virtual Expression Analyzer(Expression expression)
{
if (expression is SpecialExpression)
return Translate((SpecialExpression)expression);
else if (expression is StartIndexOffsetExpression)
return Translate(((StartIndexOffsetExpression)expression).InnerExpression);
return expression;
}
/// <summary>
/// Translates a SpecialExpression to standard Expression equivalent
/// </summary>
/// <param name="specialExpression"></param>
/// <returns></returns>
protected virtual Expression Translate(SpecialExpression specialExpression)
{
var operands = specialExpression.Operands.ToList();
switch (specialExpression.SpecialNodeType) // SETuse
{
case SpecialExpressionType.IsNull:
return TranslateIsNull(operands);
case SpecialExpressionType.IsNotNull:
return TranslateIsNotNull(operands);
case SpecialExpressionType.Concat:
return TranslateConcat(operands);
//case SpecialExpressionType.Count:
// break;
//case SpecialExpressionType.Like:
// break;
//case SpecialExpressionType.Min:
// break;
//case SpecialExpressionType.Max:
// break;
//case SpecialExpressionType.Sum:
// break;
//case SpecialExpressionType.Average:
// break;
case SpecialExpressionType.StringLength:
return TranslateStringLength(operands);
case SpecialExpressionType.ToUpper:
return GetStandardCallInvoke("ToUpper", operands);
case SpecialExpressionType.ToLower:
return GetStandardCallInvoke("ToLower", operands);
//case SpecialExpressionType.In:
// break;
case SpecialExpressionType.StringInsert:
return GetStandardCallInvoke("Insert", operands);
case SpecialExpressionType.Substring:
case SpecialExpressionType.Trim:
case SpecialExpressionType.LTrim:
case SpecialExpressionType.RTrim:
case SpecialExpressionType.Replace:
case SpecialExpressionType.Remove:
case SpecialExpressionType.IndexOf:
case SpecialExpressionType.Year:
case SpecialExpressionType.Month:
case SpecialExpressionType.Day:
case SpecialExpressionType.Hour:
case SpecialExpressionType.Minute:
case SpecialExpressionType.Millisecond:
case SpecialExpressionType.Date:
return GetStandardCallInvoke(specialExpression.SpecialNodeType.ToString(), operands);
case SpecialExpressionType.Now:
return GetDateTimeNowCall(operands);
case SpecialExpressionType.DateDiffInMilliseconds:
return GetCallDateDiffInMilliseconds(operands);
default:
throw Error.BadArgument("S0078: Implement translator for {0}", specialExpression.SpecialNodeType);
}
}
private Expression GetCallDateDiffInMilliseconds(List<Expression> operands)
{
return Expression.MakeMemberAccess(Expression.Subtract(operands.First(), operands.ElementAt(1)),
typeof(TimeSpan).GetProperty("TotalMilliseconds"));
}
private Expression GetDateTimeNowCall(List<Expression> operands)
{
return Expression.Call(typeof(DateTime).GetProperty("Now").GetGetMethod());
}
private Expression TranslateStringLength(List<Expression> operands)
{
return Expression.MakeMemberAccess(operands[0], typeof(string).GetProperty("Length"));
}
protected virtual Expression GetStandardCallInvoke(string methodName, List<Expression> operands)
{
var parametersExpressions = operands.Skip(1);
return Expression.Call(operands[0],
operands[0].Type.GetMethod(methodName, parametersExpressions.Select(op => op.Type).ToArray()),
parametersExpressions);
}
//protected virtual Expression TranslateRemove(List<Expression> operands)
//{
// if (operands.Count > 2)
// {
// return Expression.Call(operands[0],
// typeof(string).GetMethod("Remove", new[] { typeof(int), typeof(int) }),
// operands[1], operands[2]);
// }
// return Expression.Call(operands[0],
// typeof(string).GetMethod("Remove", new[] { typeof(int) }),
// operands[1]);
//}
//protected virtual Expression TranslateStringIndexOf(List<Expression> operands)
//{
// if (operands.Count == 2 && operands[1].Type == typeof(string))
// {
// return Expression.Call(operands[0],
// typeof(string).GetMethod("IndexOf", new[] { typeof(string)}),
// operands[1]);
// }
// throw new NotSupportedException();
//}
//protected virtual Expression TranslateReplace(List<Expression> operands)
//{
// if (operands.ElementAt(1).Type == typeof(string))
// {
// return Expression.Call(operands[0],
// typeof(string).GetMethod("Replace", new[] { typeof(string), typeof(string) }),
// operands[1], operands[2]);
// }
// return Expression.Call(operands[0],
// typeof(string).GetMethod("Replace", new[] { typeof(char), typeof(char) }),
// operands[1], operands[2]);
//}
//protected virtual Expression TranslateInsertString(List<Expression> operands)
//{
// return Expression.Call(operands.First(), typeof(string).GetMethod("Insert"), operands[1], operands[2]);
//}
//protected virtual Expression TranslateTrim(List<Expression> operands)
//{
// return Expression.Call(operands.First(), typeof(string).GetMethod("Trim", new Type[] { }));
//}
//protected virtual Expression TranslateSubString(List<Expression> operands)
//{
// if (operands.Count > 2)
// {
// return Expression.Call(operands[0],
// typeof(string).GetMethod("Substring", new[] { operands[1].Type, operands[2].Type }),
// operands[1], operands[2]);
// }
// return Expression.Call(operands[0],
// typeof(string).GetMethod("Substring", new[] { operands[1].Type }),
// operands[1]);
//}
//protected virtual Expression TranslateToLower(List<Expression> operands)
//{
// return Expression.Call(operands[0], typeof(string).GetMethod("ToLower", new Type[0]));
//}
//protected virtual Expression TranslateToUpper(List<Expression> operands)
//{
// return Expression.Call(operands[0], typeof(string).GetMethod("ToUpper", new Type[0]));
//}
protected virtual Expression TranslateConcat(List<Expression> operands)
{
return Expression.Add(operands[0], operands[1]);
}
protected virtual Expression TranslateIsNotNull(List<Expression> operands)
{
return Expression.NotEqual(operands[0], Expression.Constant(null));
}
protected virtual Expression TranslateIsNull(List<Expression> operands)
{
return Expression.Equal(operands[0], Expression.Constant(null));
}
}
}
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