5 // Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
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7 // Permission is hereby granted, free of charge, to any person obtaining a copy
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8 // of this software and associated documentation files (the "Software"), to deal
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9 // in the Software without restriction, including without limitation the rights
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10 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 // copies of the Software, and to permit persons to whom the Software is
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12 // furnished to do so, subject to the following conditions:
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14 // The above copyright notice and this permission notice shall be included in
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15 // all copies or substantial portions of the Software.
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17 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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27 using System.Linq.Expressions;
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30 using System.Data.Linq.Sugar;
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31 using System.Data.Linq.Sugar.ExpressionMutator;
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32 using System.Data.Linq.Sugar.Expressions;
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34 using DbLinq.Data.Linq.Sugar;
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35 using DbLinq.Data.Linq.Sugar.ExpressionMutator;
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36 using DbLinq.Data.Linq.Sugar.Expressions;
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40 namespace System.Data.Linq.Sugar.Implementation
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42 namespace DbLinq.Data.Linq.Sugar.Implementation
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46 /// Analyzes Expressions before translation to SQL, to help the translator
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47 /// "Prequel" stands, of course, for "PreSQL"
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49 internal class PrequelAnalyzer : IPrequelAnalyzer
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52 /// Translates some generic CLR patterns to specific preSQL patterns
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54 /// <param name="expression"></param>
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55 /// <param name="builderContext"></param>
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56 /// <returns></returns>
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57 public virtual Expression Analyze(Expression expression, BuilderContext builderContext)
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59 return expression.Recurse(e => AnalyzeExpression(e, builderContext));
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62 protected virtual Expression AnalyzeExpression(Expression expression, BuilderContext builderContext)
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64 // string Add --> Concat
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65 var binaryExpression = expression as BinaryExpression;
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66 if (expression.NodeType == ExpressionType.Add
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67 && binaryExpression != null && typeof(string).IsAssignableFrom(binaryExpression.Left.Type))
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69 return new SpecialExpression(SpecialExpressionType.Concat, binaryExpression.Left, binaryExpression.Right);
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