microsoft-visualbasic-runtime/Scripting/TokenIcer/LangModels/Token.vb

#Region "Microsoft.VisualBasic::8442b5511d4d38c00b4606303d901d89, Microsoft.VisualBasic.Core\Scripting\TokenIcer\LangModels\Token.vb"

    ' Author:
    ' 
    '       asuka (amethyst.asuka@gcmodeller.org)
    '       xie (genetics@smrucc.org)
    '       xieguigang (xie.guigang@live.com)
    ' 
    ' Copyright (c) 2018 GPL3 Licensed
    ' 
    ' 
    ' GNU GENERAL PUBLIC LICENSE (GPL3)
    ' 
    ' 
    ' This program is free software: you can redistribute it and/or modify
    ' it under the terms of the GNU General Public License as published by
    ' the Free Software Foundation, either version 3 of the License, or
    ' (at your option) any later version.
    ' 
    ' This program is distributed in the hope that it will be useful,
    ' but WITHOUT ANY WARRANTY; without even the implied warranty of
    ' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    ' GNU General Public License for more details.
    ' 
    ' You should have received a copy of the GNU General Public License
    ' along with this program. If not, see <http://www.gnu.org/licenses/>.



    ' /********************************************************************************/

    ' Summaries:

    '     Class Token
    ' 
    '         Properties: Arguments, Closure, IsClosure, IsFunction, IsNumeric
    '                     IsObject, name, Text, Type, UNDEFINED
    '                     Value
    ' 
    '         Constructor: (+3 Overloads) Sub New
    '         Function: GetValue, ToString
    ' 
    '     Class Statement
    ' 
    '         Properties: tokens, Trace
    ' 
    '         Function: ToString
    ' 
    '     Class Main
    ' 
    '         Properties: program
    ' 
    ' 
    ' /********************************************************************************/

#End Region

Imports System.Xml.Serialization
Imports Microsoft.VisualBasic.Language
Imports Microsoft.VisualBasic.Text.Xml.Models

Namespace Scripting.TokenIcer

    ''' <summary>
    ''' a Token object class, This defines the Token object
    ''' </summary>
    ''' <typeparam name="Tokens">应该是枚举类型</typeparam>
    ''' <remarks>
    ''' A Token object holds the token and token value.
    ''' </remarks>
    Public Class Token(Of Tokens As IComparable) : Implements Value(Of String).IValueOf

        ''' <summary>
        ''' Token type
        ''' </summary>
        ''' <returns></returns>
        <XmlAttribute("name")> Public Property name As Tokens

        ''' <summary>
        ''' 函数参数列表
        ''' </summary>
        ''' <returns></returns>
        Public Property Arguments As Statement(Of Tokens)()
        ''' <summary>
        ''' 这个token所拥有的闭包下一级代码，这个属性的值可以看作为具体的函数体
        ''' </summary>
        ''' <returns></returns>
        Public Property Closure As Main(Of Tokens)

        ''' <summary>
        ''' The text that makes up the token.
        ''' </summary>
        ''' <returns></returns>
        <XmlText> Public Property Value As String Implements Value(Of String).IValueOf.value

        ''' <summary>
        ''' You must keep the UNDEFINED type equals to ZERO!.
        ''' (务必要保持0为未定义，如果不是使用零来定义未定义类型，则不能够使用这个属性来判断)
        ''' </summary>
        ''' <returns></returns>
        Public ReadOnly Property UNDEFINED(Optional int% = 0) As Boolean
            Get
                If TypeOf name Is [Enum] OrElse TypeOf name Is Integer Then
                    Dim o As Object = name
                    Dim i As Integer = CInt(o)
                    If i = int Then
                        Return True
                    End If
                End If

                Return name Is Nothing OrElse
                    String.IsNullOrEmpty(Value)
            End Get
        End Property

        ''' <summary>
        ''' The token type, this property is an alias of <see cref="name"/> property
        ''' </summary>
        ''' <returns></returns>
        Public ReadOnly Property Type As Tokens
            Get
                Return name
            End Get
        End Property

        ''' <summary>
        ''' Gets the text value that make up this token value, this readonly property 
        ''' is an alias of the <see cref="Value"/> property.
        ''' </summary>
        ''' <returns></returns>
        Public ReadOnly Property Text As String
            Get
                Return Value
            End Get
        End Property

        ''' <summary>
        ''' Returns a Boolean value indicating whether an expression can be evaluated as
        ''' a number.
        ''' </summary>
        ''' <returns></returns>
        Public ReadOnly Property IsNumeric As Boolean
            Get
                Return Information.IsNumeric(Text)
            End Get
        End Property

        Public ReadOnly Property IsFunction As Boolean
            Get
                Return Not Arguments.IsNullOrEmpty
            End Get
        End Property

        Public ReadOnly Property IsClosure As Boolean
            Get
                Return Not Closure Is Nothing
            End Get
        End Property

        ''' <summary>
        ''' This token object eigther not a function and not a closure.
        ''' </summary>
        ''' <returns></returns>
        Public ReadOnly Property IsObject As Boolean
            Get
                Return Not IsClosure AndAlso Not IsFunction
            End Get
        End Property

        Public Sub New(name As Tokens, value$)
            Me.name = name
            Me.Value = value
        End Sub

        Sub New(name As Tokens)
            Me.name = name
        End Sub

        Sub New()
        End Sub

        Public Overrides Function ToString() As String
            If UNDEFINED Then
                Return "* " & Value
            Else
                Return $"[{name}] {Value}"
            End If
        End Function

        Public Function GetValue() As Object
            Return Me.TryCast
        End Function
    End Class

    ''' <summary>
    ''' The statement line that parsing from the script text
    ''' </summary>
    Public Class Statement(Of T As IComparable)

        <XmlElement("t")> Public Property tokens As Token(Of T)()
        ''' <summary>
        ''' The script text raw data?
        ''' </summary>
        ''' <returns></returns>
        Public Property Trace As LineValue

        Public Overrides Function ToString() As String
            Return tokens _
                .Select(Function(t) t.ToString) _
                .JoinBy(" ")
        End Function
    End Class

    ''' <summary>
    ''' inner closure or program main
    ''' </summary>
    ''' <typeparam name="T"></typeparam>
    Public Class Main(Of T As IComparable)
        Public Property program As Statement(Of T)()
    End Class
End Namespace