From 812c5778b1e0280ce0a82d8985efdc24f367f9cd Mon Sep 17 00:00:00 2001
From: xieguigang <xie.guigang@gcmodeller.org>
Date: Sat, 16 Jan 2021 16:10:57 +0800
Subject: [PATCH] linq keyword expression

---
 .../Expressions/Keywords/OutputProjection.vb  | 22 +++++++++++++++++++
 .../{ => Keywords}/SymbolDeclare.vb           |  0
 .../Expressions/{ => Keywords}/WhereFilter.vb |  0
 LINQ/LINQ/LINQ.vbproj                         |  5 +++--
 4 files changed, 25 insertions(+), 2 deletions(-)
 create mode 100644 LINQ/LINQ/Interpreter/Expressions/Keywords/OutputProjection.vb
 rename LINQ/LINQ/Interpreter/Expressions/{ => Keywords}/SymbolDeclare.vb (100%)
 rename LINQ/LINQ/Interpreter/Expressions/{ => Keywords}/WhereFilter.vb (100%)

diff --git a/LINQ/LINQ/Interpreter/Expressions/Keywords/OutputProjection.vb b/LINQ/LINQ/Interpreter/Expressions/Keywords/OutputProjection.vb
new file mode 100644
index 0000000..7eefa79
--- /dev/null
+++ b/LINQ/LINQ/Interpreter/Expressions/Keywords/OutputProjection.vb
@@ -0,0 +1,22 @@
+Imports LINQ.Runtime
+Imports Microsoft.VisualBasic.ComponentModel.DataSourceModel
+
+Namespace Interpreter.Expressions
+
+    Public Class OutputProjection : Inherits Expression
+
+        Public Property fields As NamedValue(Of Expression)()
+
+        Sub New(fields As IEnumerable(Of NamedValue(Of Expression)))
+            Me.fields = fields.ToArray
+        End Sub
+
+        Public Overrides Function Exec(env As Environment) As Object
+            Throw New NotImplementedException()
+        End Function
+
+        Public Overrides Function ToString() As String
+            Return $"new {{{fields.Select(Function(a) $"{a.Name} = {a.Value}").JoinBy(", ")}}}"
+        End Function
+    End Class
+End Namespace
\ No newline at end of file
diff --git a/LINQ/LINQ/Interpreter/Expressions/SymbolDeclare.vb b/LINQ/LINQ/Interpreter/Expressions/Keywords/SymbolDeclare.vb
similarity index 100%
rename from LINQ/LINQ/Interpreter/Expressions/SymbolDeclare.vb
rename to LINQ/LINQ/Interpreter/Expressions/Keywords/SymbolDeclare.vb
diff --git a/LINQ/LINQ/Interpreter/Expressions/WhereFilter.vb b/LINQ/LINQ/Interpreter/Expressions/Keywords/WhereFilter.vb
similarity index 100%
rename from LINQ/LINQ/Interpreter/Expressions/WhereFilter.vb
rename to LINQ/LINQ/Interpreter/Expressions/Keywords/WhereFilter.vb
diff --git a/LINQ/LINQ/LINQ.vbproj b/LINQ/LINQ/LINQ.vbproj
index 33105a0..cf7a46e 100644
--- a/LINQ/LINQ/LINQ.vbproj
+++ b/LINQ/LINQ/LINQ.vbproj
@@ -129,8 +129,9 @@
     <Compile Include="Interpreter\Executable.vb" />
     <Compile Include="Interpreter\Expressions\BinaryExpression.vb" />
     <Compile Include="Interpreter\Expressions\ArrayExpression.vb" />
-    <Compile Include="Interpreter\Expressions\WhereFilter.vb" />
-    <Compile Include="Interpreter\Expressions\SymbolDeclare.vb" />
+    <Compile Include="Interpreter\Expressions\Keywords\OutputProjection.vb" />
+    <Compile Include="Interpreter\Expressions\Keywords\WhereFilter.vb" />
+    <Compile Include="Interpreter\Expressions\Keywords\SymbolDeclare.vb" />
     <Compile Include="Interpreter\Query\AggregateExpression.vb" />
     <Compile Include="Interpreter\Query\Query.vb" />
     <Compile Include="Interpreter\Query\DataSoruce.vb" />