source: Include/Classes/System/IO/Path.ab @ 197

' System/IO/Path.ab

#require <Classes/System/Environment.ab>

Class Path
Public
    Static AltDirectorySeparatorChar = &H2F As Char '/
    Static DirectorySeparatorChar = &H5C As Char    '\
    Static PathSeparator = &H3B As Char             ';
    Static VolumeSeparatorChar = &H3A As Char       ':

    Static Function GetFileName(path As String) As String
        Return path.Remove(0, getLastSeparatorPosision(path) + 1)
    End Function

    Static Function GetFileNameWithoutExtension(path As String) As String
        Dim fileName = GetFileName(path) As String
        Dim extPos = getExtensionPosition(fileName) As Long
        If extPos = -1 Then Return ""

        Return fileName.Remove(extPos)
    End Function

    '手抜き
    Static Function GetRandomFileName() As String
        Randomize
        Dim temp As Long
        temp = Rnd() * 900000000 + 10000000
        Return Str$(temp)
    End Function

    Static Function GetExtension(path As String) As String
        Dim extPos = getExtensionPosition(path) As Long
        If extPos = -1 Then Return ""

        Return path.Remove(0, extPos)
    End Function

    Static Function ChangeExtension(path As String, extension As String) As String
        Dim extPos = getExtensionPosition(path) As Long
        If extPos => 0 Then
            path = path.Remove(extPos)
        End If

        Return path + extension
    End Function

    Static Function HasExtension(ByRef path As String) As Boolean
        If GetExtension(path) <> "" Then
            Return True
        Else
            Return False
        End If
    End Function

    Static Function GetTempFileName() As String
        Dim tempPathSize = __GetTempPath(0, 0)
        Dim tempPath = _System_malloc(SizeOf (TCHAR) * tempPathSize) As PTSTR
        If tempPath = 0 Then
            ' Throw OutOfMemoryException
            Debug
        End If
        If __GetTempPath(tempPathSize, tempPath) > tempPathSize Then
            ' Throw IOException?
            Debug
        End If

        Dim tempFileName[ELM(MAX_PATH)] As TCHAR
        __GetTempFileName(tempPath, "ABT", 0, tempFileName)
        free(tempPath)
        Return tempFileName
    End Function

    Static Function GetTempPath() As String
        Dim size = GetTempPath(0, 0)
        Dim tempPath = _System_malloc(size)
        __GetTempPath(size, tempPath)
        GetTempPath = tempPath
        _System_free(tempPath)
    End Function

    Static Function GetFullPath(path As String) As String
        If IsPathRooted(path) Then
            Return path
        Else
            Return Environment.CurrentDirectory + Chr$(DirectorySeparatorChar) + path
        End If
    End Function

    Static Function GetDirectoryName(path As String) As String
        Dim lastSepPos = getLastSeparatorPosision(path) As Long
        If lastSepPos = -1 Then Return ""

        path = path.Remove(lastSepPos)
        If path.Length <= 3 Then
            If IsPathRooted(path) Then Return ""
        End If
        Return path
    End Function

    Static Function GetPathRoot(path As String) As String
        If IsPathRooted(path) Then
            Return path.Remove(3)
        Else
            Return ""
        End If
    End Function

    Static Function IsPathRooted(path As String) As Boolean
        If path.IndexOf(Chr$(VolumeSeparatorChar), 1, 1) = 1 Then
            Return True
        Else
            Return False
        End If
    End Function

    Static Function Combine(path1 As String, path2 As String) As String
        If path1.LastIndexOf(Chr$(VolumeSeparatorChar)) And path1.Length = 2 Then
            Return path1 + path2
        End If

        If path1.LastIndexOf(Chr$(DirectorySeparatorChar), ELM(path1.Length), 1) = -1 Then
            Return path1 + Chr$(DirectorySeparatorChar) + path2
        Else
            Return path1 + path2
        End If
    End Function

Private
    Static Function getExtensionPosition(ByRef path As String) As Long
        Dim lastSepPos = getLastSeparatorPosision(path) As Long
        getExtensionPosition = path.LastIndexOf(".", ELM(path.Length), path.Length - lastSepPos)
    End Function

    Static Function getLastSeparatorPosision(ByRef path As String) As Long
        Dim lastSepPos = path.LastIndexOf(Chr$(DirectorySeparatorChar)) As Long
        If lastSepPos <> -1 Then Return lastSepPos

        lastSepPos = path.LastIndexOf(Chr$(VolumeSeparatorChar))
        Return lastSepPos
    End Function
End Class

'今はメソッド内で使えないので、実装されるまで回避
Function __GetTempPath(nBufferLength As DWord, lpBuffer As LPSTR) As DWord
    Return GetTempPath(nBufferLength, lpBuffer)
End Function

Function __GetTempFileName(pPathName As PCSTR, pPrefixString As PCSTR, uUnique As DWord, pTempFileName As PSTR) As DWord
    Return GetTempFileName(pPathName, pPrefixString, uUnique, pTempFileName)
End Function