135 lines
5.2 KiB
VB.net
135 lines
5.2 KiB
VB.net
#Region "Microsoft.VisualBasic::634b9ff803b059f0e05b34bb831afc16, R#\Language\Syntax\SyntaxImplements\SwitchClosureSyntax.vb"
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' Author:
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'
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' asuka (amethyst.asuka@gcmodeller.org)
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' xie (genetics@smrucc.org)
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' xieguigang (xie.guigang@live.com)
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'
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' Copyright (c) 2018 GPL3 Licensed
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'
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'
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' GNU GENERAL PUBLIC LICENSE (GPL3)
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'
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU General Public License as published by
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' the Free Software Foundation, either version 3 of the License, or
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' (at your option) any later version.
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'
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' This program is distributed in the hope that it will be useful,
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' but WITHOUT ANY WARRANTY; without even the implied warranty of
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' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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' GNU General Public License for more details.
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'
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' You should have received a copy of the GNU General Public License
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' along with this program. If not, see <http://www.gnu.org/licenses/>.
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' /********************************************************************************/
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' Summaries:
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' Code Statistics:
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' Total Lines: 80
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' Code Lines: 68 (85.00%)
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' Comment Lines: 0 (0.00%)
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' - Xml Docs: 0.00%
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'
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' Blank Lines: 12 (15.00%)
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' File Size: 3.79 KB
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' Module SwitchClosureSyntax
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'
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' Function: GetSwitchs
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'
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'
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' /********************************************************************************/
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#End Region
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Imports Microsoft.VisualBasic.ApplicationServices.Debugging.Diagnostics
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Imports Microsoft.VisualBasic.Language
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Imports SMRUCC.Rsharp.Interpreter.ExecuteEngine.ExpressionSymbols.Closure
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Imports SMRUCC.Rsharp.Interpreter.ExecuteEngine.ExpressionSymbols.DataSets
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Imports SMRUCC.Rsharp.Interpreter.ExecuteEngine.ExpressionSymbols.Operators
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Imports SMRUCC.Rsharp.Language
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Imports SMRUCC.Rsharp.Language.TokenIcer
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Namespace Language.Syntax.SyntaxParser.SyntaxImplements
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Module SwitchClosureSyntax
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Public Function GetSwitchs(tokens As Token(), opts As SyntaxBuilderOptions) As SyntaxResult
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Dim code = tokens.SplitByTopLevelDelimiter(TokenType.close, tokenText:=")")
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Dim input = code(Scan0).Skip(2).Take(code(Scan0).Length - 2).SplitByTopLevelDelimiter(TokenType.comma)
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Dim keyVal = ExpressionBuilder.ParseExpression(New List(Of Token()) From {input(Scan0)}, opts)
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Dim stackframe As StackFrame = opts.GetStackTrace(tokens(Scan0), "switch")
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Dim [default] As SyntaxResult
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If keyVal.isException Then
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Return keyVal
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ElseIf input = 3 Then
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[default] = ExpressionBuilder.ParseExpression(New List(Of Token()) From {input(2)}, opts)
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If [default].isException Then
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Return [default]
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Else
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Call opts.SetCurrentRange(input(2))
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End If
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If Not TypeOf [default].expression Is DeclareLambdaFunction Then
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Return SyntaxResult.CreateError(New Exception("invalid expression type for the default value of the switch expression!"), opts)
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Else
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With DirectCast([default].expression, DeclareLambdaFunction)
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[default] = New SyntaxResult(.closure)
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End With
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End If
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Else
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[default] = Nothing
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End If
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Dim switch As New SwitchExpression(keyVal.expression, [default]?.expression, stackframe)
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Dim options = code(2) _
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.Skip(1) _
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.Take(code(2).Length - 2) _
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.SplitByTopLevelDelimiter(TokenType.comma)
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For Each opt As Token() In From line In options Where line.Length > 1
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Dim optVal = ExpressionBuilder.ParseExpression(New List(Of Token()) From {opt}, opts)
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If optVal.isException Then
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Return optVal
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ElseIf Not TypeOf optVal.expression Is ValueAssignExpression Then
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Return SyntaxResult.CreateError(
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err:=New Exception("invalid expression for switch options!"),
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opts:=opts.SetCurrentRange(opt)
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)
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Else
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With DirectCast(optVal.expression, ValueAssignExpression)
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Dim keyStr As [Variant](Of String(), Exception)
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If TypeOf .targetSymbols(Scan0) Is Literal Then
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keyStr = {DirectCast(.targetSymbols(Scan0), Literal).ValueStr}
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Else
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keyStr = FormulaExpression.GetSymbols(.targetSymbols(Scan0))
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End If
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If keyStr Like GetType(Exception) Then
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Return SyntaxResult.CreateError(keyStr, opts.SetCurrentRange(opt))
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Else
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Call switch.Add(keyStr.TryCast(Of String())()(0), .value)
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End If
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End With
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End If
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Next
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Return switch
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End Function
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End Module
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End Namespace
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