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Copy pathStringBuilder_Implementation.inc
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219 lines (164 loc) · 7.44 KB
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'
' StringBuilder internal implementation
'
Class thinStringBuilder
'---
Instance defaultCapacity As Dword
Instance internalCapacity As Dword
Instance internalLength As Dword
Instance internalBuffer As String
'---Common usage
Instance MaxAddedStringLen As Dword
'--------------------------------------------
Class Method Create()
'--------------------------------------------
defaultCapacity = 16
End Method
'--------------------------------------------
Interface iThinStringBuilder
Inherit IUnknown
'--------------------------------------------
Method Initialize1()
'--------------------------------------------
internalBuffer = Nul$(defaultCapacity)
internalCapacity = Len(internalBuffer)
internalLength = 0
End Method
'--------------------------------------------
Method Initialize2( initialCapacity As Dword )
'--------------------------------------------
defaultCapacity = initialCapacity
Me.Initialize1()
End Method
'--------------------------------------------
Method Initialize3(ByRef initialContent As String )
'--------------------------------------------
Me.Initialize2(Len(initialContent) * 2)
Me.Add(initialContent)
End Method
'--------------------------------------------
Method Add(ByRef addedText As String )
'--------------------------------------------
Local finalLength As Dword
Local addedTextLen As Dword
Local finalCapacity As Dword
Local lIncrement As Dword
Local lIncreaseBufferStrategy As Long
addedTextLen = Len(addedText)
finalLength = internalLength + addedTextLen
'---Determine max added string len so far
If MaxAddedStringLen < addedTextLen Then MaxAddedStringLen = addedTextLen
If finalLength > internalCapacity Then
'---We need to increase internal string adding more capacity
'---But how much more capacity? Here different strategies
lIncreaseBufferStrategy = 1
Select Case Long lIncreaseBufferStrategy
Case 1 '---Startegy 1: increase by double current final len
lIncrement = finalLength
finalCapacity = finalLength + finalLength
Case 2 '---Startegy 2: add 4 times the current added text ...
lIncrement = addedTextLen * 4
finalCapacity = finalLength + lIncrement
Case 3 '---Startegy 3: add Max Added String Len so far ...
lIncrement = MaxAddedStringLen
finalCapacity = finalLength + lIncrement
End Select
internalBuffer += Nul$(finalCapacity - internalCapacity)
internalCapacity = Len(internalBuffer)
End If
Mid$(internalBuffer, internalLength + 1) = addedText
internalLength += addedTextLen
End Method
'--------------------------------------------
Method AddLine(ByRef addedText As String )
'--------------------------------------------
Me.Add(addedText + $CrLf)
End Method
'--------------------------------------------
Method Clear()
'--------------------------------------------
Me.Initialize1()
End Method
'--------------------------------------------
Property Get Capacity As Dword
'--------------------------------------------
Property = internalCapacity
End Property
'--------------------------------------------
Property Set Capacity(ByVal value As Dword )
'--------------------------------------------
If value < internalCapacity Then
internalBuffer = Left$(internalBuffer, value)
If internalLength > value Then
internalLength = value
End If
End If
If value > internalCapacity Then
internalBuffer += Nul$(value - internalCapacity)
End If
internalCapacity = Len(internalBuffer)
End Property
'--------------------------------------------
Property Get Length As Dword
'--------------------------------------------
Property = internalLength
End Property
'--------------------------------------------
Property Get Char(ByVal position As Dword ) As String
'--------------------------------------------
If position > internalLength Then
thinbasic_RunTimeError ( %ERR__MODULE_SPECIFIC, "Position is outside text length. Passed:" + Str$(position) + ", Length:" + Str$(internalLength) )
Exit Property
End If
Property = Mid$(internalBuffer, position, 1)
End Property
'--------------------------------------------
Property Set Char(ByVal position As Dword, ByRef value As String )
'--------------------------------------------
If position > internalLength Then
thinbasic_RunTimeError ( %ERR__MODULE_SPECIFIC, "Position is outside text length. Passed:" + Str$(position) + ", Length:" + Str$(internalLength) )
Exit Property
End If
If Len(value) > 1 Then
thinbasic_RunTimeError ( %ERR__MODULE_SPECIFIC, "Only single character allowed. Passed:" + value)
Exit Property
End If
Mid$(internalBuffer, position) = value
End Property
'--------------------------------------------
Property Get CharCode(ByVal position As Dword ) As Byte
'--------------------------------------------
If position > internalLength Then
thinbasic_RunTimeError ( %ERR__MODULE_SPECIFIC, "Position is outside text length. Passed:" + Str$(position) + ", Length:" + Str$(internalLength) )
Exit Property
End If
Dim asciiCode(1 To position) As Byte At StrPtr(internalBuffer)
Property = asciiCode(position)
End Property
'--------------------------------------------
Property Set CharCode(ByVal position As Dword, value As Byte )
'--------------------------------------------
If position > internalLength Then
thinbasic_RunTimeError ( %ERR__MODULE_SPECIFIC, "Position is outside text length. Passed:" + Str$(position) + ", Length:" + Str$(internalLength) )
Exit Property
End If
Dim asciiCode(1 To position) As Byte At StrPtr(internalBuffer)
asciiCode(position) = value
End Property
'--------------------------------------------
Property Get DataPtr() As Dword
'--------------------------------------------
Property = StrPtr(internalBuffer)
End Property
'--------------------------------------------
Property Get VarPtr() As Dword
'--------------------------------------------
Property = VarPtr(internalBuffer)
End Property
'--------------------------------------------
Method ToString() As String
'--------------------------------------------
Method = Left$(internalBuffer, internalLength)
End Method
End Interface
End Class