clsvar.cls

编译原理课程设计用vb编写

VERSION 1.0 CLASS
BEGIN
  MultiUse = -1  'True
  Persistable = 0  'NotPersistable
  DataBindingBehavior = 0  'vbNone
  DataSourceBehavior  = 0  'vbNone
  MTSTransactionMode  = 0  'NotAnMTSObject
END
Attribute VB_Name = "clsVar"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = True
Attribute VB_PredeclaredId = False
Attribute VB_Exposed = False
Private Vars As New Collection
Public VarNames As New Collection

Public Sub Clear()
    '清空所有变量
    Dim v As New Collection
    Set Vars = v
    Dim vn As New Collection
    Set VarNames = New Collection
End Sub

Public Function setVar(ByVal name As String, ByVal value As Double)
    '变量赋值
    On Error Resume Next
    Dim v() As String
    v = Split(KEYWORD, ",")
    If inArray(v, name) Then
        Err.Raise 59, , "变量名" & name & "不合法"
        Exit Function
    End If
    t = Vars(name)
    AddVarName name
    If Err.Number > 0 Then
        Err.Clear
        Vars.Add value, name
    Else
        Vars.Remove (name)
        Vars.Add value, name
    End If
End Function

Public Function getVar(ByVal name As String)
    '读取变量
    On Error Resume Next
    Dim v() As String
    v = Split(KEYWORD, ",")
    If inArray(v, name) Then
        Err.Raise 59, , "变量名" & name & "不合法"
        Exit Function
    End If
    t = Vars(name)
    AddVarName name
    If Err.Number > 0 Then
        Vars.Add 0, name
        Err.Clear
        getVar = 0
    Else
        getVar = t
    End If
End Function

Private Function AddVarName(ByVal name As String)
    For i = 1 To VarNames.Count
        If VarNames(i) = name Then Exit Function
    Next
    VarNames.Add name
End Function