source: trunk/Include/Classes/System/String.ab@ 328

' Classes/System/String.ab

#require <basic/function.sbp>
#require <Classes/System/Text/StringBuilder.ab>
#require <Classes/ActiveBasic/Strings/Strings.ab>

#ifdef __STRING_IS_NOT_ALWAYS_UNICODE
TypeDef StrChar = Char
#ifndef UNICODE
#define __STRING_IS_NOT_UNICODE
#endif
#else
TypeDef StrChar = WCHAR
#ifndef UNICODE
#define __STRING_UNICODE_WINDOWS_ANSI
#endif
#endif

Namespace System

    Class String
    '   Inherits IComparable, ICloneable, IConvertible, IEnumerable

        m_Length As Long
        Chars As *StrChar

        Sub validPointerCheck(p As VoidPtr, size = 1 As Long)
            If p As ULONG_PTR < &h10000 Then
                'Throw ArgumentException
                Debug
            ElseIf IsBadReadPtr(p, size As ULONG_PTR) Then
                'Throw ArgumentException
                Debug
            End If
        End Sub
    Public
        Static Const Empty = New String

        Sub String()
'           Chars = 0
'           m_Length = 0
        End Sub

        Sub String(initStr As PCWSTR)
            validPointerCheck(initStr)
            Assign(initStr, lstrlenW(initStr))
        End Sub

        Sub String(initStr As PCWSTR, length As Long)
            validPointerCheck(initStr, length)
            Assign(initStr, length)
        End Sub

        Sub String(initStr As PCWSTR, start As Long, length As Long)
            If start < 0 Or length Or start + length < 0 Then
                'Throw New ArgumentOutOfRangeException
            End If
            validPointerCheck(initStr + start, length)
            Assign(initStr + start, length)
        End Sub

        Sub String(initStr As PCSTR)
            validPointerCheck(initStr)
            Assign(initStr, lstrlenA(initStr))
        End Sub

        Sub String(initStr As PCSTR, length As Long)
            validPointerCheck(initStr, length)
            Assign(initStr, length)
        End Sub

        Sub String(initStr As PCSTR, start As Long, length As Long)
            If start < 0 Or length Or start + length < 0 Then
                'Throw New ArgumentOutOfRangeException
            End If
            validPointerCheck(initStr + start, length)
            Assign(initStr + start, length)
        End Sub
        
        Sub String(initStr As String)
            If Not String.IsNullOrEmpty(initStr) Then
                Assign(initStr.Chars, initStr.m_Length)
            End If
        End Sub

        Sub String(initChar As StrChar, length As Long)
            AllocStringBuffer(length)
            ActiveBasic.Strings.ChrFill(Chars, length, initChar)
            Chars[length] = 0
        End Sub

        Sub String(sb As System.Text.StringBuilder)
            Chars = StrPtr(sb)
            m_Length = sb.Length
            sb.__Stringized()
        End Sub

        Const Function Length() As Long
            Return m_Length
        End Function

        Function Operator() As *StrChar
            Return Chars
        End Function

        Const Function Operator [] (n As Long) As StrChar
            rangeCheck(n)
            Return Chars[n]
        End Function

        Const Function Operator + (y As PCSTR) As String
            Return Concat(y, lstrlenA(y))
        End Function

        Const Function Operator + (y As PCWSTR) As String
            Return Concat(y, lstrlenW(y))
        End Function

        Const Function Operator + (y As String) As String
            Return Concat(y.Chars, y.m_Length)
        End Function

        Const Function Operator & (y As PCSTR) As String
            Return This + y
        End Function

        Const Function Operator & (y As PCWSTR) As String
            Dim tempString = This + y
            Return tempString
        End Function

        Const Function Operator & (y As String) As String
            Dim tempString = This + y
            Return tempString
        End Function

        Const Function Operator == (y As String) As Boolean
            Return String.Compare(This, y) = 0
        End Function

        Const Function Operator == (y As *StrChar) As Boolean
            Return String.Compare(This, y) = 0
        End Function

        Const Function Operator <> (y As String) As Boolean
            Return String.Compare(This, y) <> 0
        End Function

        Const Function Operator <> (y As *StrChar) As Boolean
            Return String.Compare(This, y) <> 0
        End Function

        Const Function Operator < (y As String) As Boolean
            Return String.Compare(This, y) < 0
        End Function

        Const Function Operator < (y As *StrChar) As Boolean
            Return String.Compare(This, y) < 0
        End Function

        Const Function Operator > (y As String) As Boolean
            Return String.Compare(This, y) > 0
        End Function

        Const Function Operator > (y As *StrChar) As Boolean
            Return String.Compare(This, y) > 0
        End Function

        Const Function Operator <= (y As String) As Boolean
            Return String.Compare(This, y) <= 0
        End Function

        Const Function Operator <= (y As *StrChar) As Boolean
            Return String.Compare(This, y) <= 0
        End Function

        Const Function Operator >= (y As String) As Boolean
            Return String.Compare(This, y) >= 0
        End Function

        Const Function Operator >= (y As *StrChar) As Boolean
            Return String.Compare(This, y) >= 0
        End Function

        Static Function Compare(x As String, y As String) As Long
            Return CompareOrdinal(x, y)
        End Function

    Public
        Static Function Compare(x As String, indexX As Long, y As String, indexY As Long, length As Long) As Long
            Return String.CompareOrdinal(x, indexX, y, indexY, length)
        End Function

        Static Function CompareOrdinal(x As String, y As String) As Long
            Return String.CompareOrdinal(x.Chars, y.Chars)
        End Function

        Static Function CompareOrdinal(x As String, indexX As Long, y As String, indexY As Long, length As Long) As Long
            Return String.CompareOrdinal(x.Chars, indexX, y.Chars, indexY, length)
        End Function
    Private
        Static Function Compare(x As String, y As *StrChar) As Long
            Return String.CompareOrdinal(x, y)
        End Function

        Static Function CompareOrdinal(x As String, y As *StrChar) As Long
            Return String.CompareOrdinal(x.Chars, y)
        End Function

        Static Function CompareOrdinal(x As *StrChar, y As *StrChar) As Long
            If x = 0 Then
                If y = 0 Then
                    Return 0
                Else
                    Return -1
                End If
            ElseIf y = 0 Then
                Return 1
            End If
            Return ActiveBasic.Strings.StrCmp(x, y)
        End Function

        Static Function CompareOrdinal(x As *StrChar, indexX As Long, y As *StrChar, indexY As Long, length As Long) As Long
            If x = 0 Then
                If y = 0 Then
                    Return 0
                Else
                    Return -1
                End If
            ElseIf y = 0 Then
                Return 1
            End If
            Return ActiveBasic.Strings.ChrCmp(VarPtr(x[indexX]), VarPtr(y[indexY]), length As SIZE_T)
        End Function
    Public
        Function CompareTo(y As String) As Long
            Return String.Compare(This, y)
        End Function

        Function CompareTo(y As Object) As Long
            Dim s = y As String
    '       If y is not String Then
    '           Throw New ArgumentException
    '       End If
            Return CompareTo(y As String)
        End Function

        Function Equals(s As String) As Boolean
            Return This = s
        End Function

        Override Function Equals(s As Object) As Boolean
            If This.GetType = s.GetType Then
                Return This.Equals(s As String)
            End If
            Return False
        End Function

        Const Function StrPtr() As *StrChar
            Return Chars
        End Function
Private

        Sub Assign(text As PCSTR, textLengthA As Long)
#ifdef __STRING_IS_NOT_UNICODE
            AssignFromStrChar(text, textLengthA)
#else
            Dim textLengthW = MultiByteToWideChar(CP_THREAD_ACP, 0, text, textLengthA, 0, 0)
            If AllocStringBuffer(textLengthW) <> 0 Then
                MultiByteToWideChar(CP_THREAD_ACP, 0, text, textLengthA, Chars, textLengthW)
                Chars[textLengthW] = 0
            End If
#endif
        End Sub

        Sub Assign(text As PCWSTR, textLengthW As Long)
#ifdef __STRING_IS_NOT_UNICODE
            Dim textLengthA = WideCharToMultiByte(CP_THREAD_ACP, 0, text, textLengthW, 0, 0, 0, 0)
            If AllocStringBuffer(textLengthA) <> 0 Then
                WideCharToMultiByte(CP_THREAD_ACP, 0, text, textLengthW, Chars, textLengthA, 0, 0)
                Chars[textLengthA] = 0
            End If
#else
            AssignFromStrChar(text, textLengthW)
#endif
        End Sub

    Private
        Static Function ConcatStrChar(text1 As *StrChar, text1Length As Long, text2 As *StrChar, text2Length As Long) As String
            ConcatStrChar = New String()
            With ConcatStrChar
                .AllocStringBuffer(text1Length + text2Length)
                ActiveBasic.Strings.ChrCopy(.Chars, text1, text1Length As SIZE_T)
                ActiveBasic.Strings.ChrCopy(VarPtr(.Chars[text1Length]), text2, text2Length As SIZE_T)
                .Chars[text1Length + text2Length] = 0
            End With
        End Function
    Public
        Const Function Concat(text As PCSTR, len As Long) As String
#ifdef __STRING_IS_NOT_UNICODE
            Return ConcatStrChar(This.Chars, m_Length, text, len)
#else
            With Concat
                Dim lenW = MultiByteToWideChar(CP_THREAD_ACP, 0, text, len, 0, 0)
                Concat = New String
                .AllocStringBuffer(m_Length + lenW)
                ActiveBasic.Strings.ChrCopy(.Chars, This.Chars, m_Length)
                MultiByteToWideChar(CP_THREAD_ACP, 0, text, len, VarPtr(.Chars[m_Length]), lenW)
                .Chars[m_Length + lenW] = 0
            End With
#endif
        End Function

        Const Function Concat(text As PCWSTR, len As Long) As String
#ifdef __STRING_IS_NOT_UNICODE
            With Concat
                Concat = New String
                Dim lenA = WideCharToMultiByte(CP_THREAD_ACP, 0, text, len, 0, 0, 0, 0)
                .AllocStringBuffer(m_Length + lenA)
                ActiveBasic.Strings.ChrCopy(.Chars, This.Chars, m_Length As SIZE_T)
                WideCharToMultiByte(CP_THREAD_ACP, 0, text, len, VarPtr(.Chars[m_Length]), lenA, 0, 0)
                .Chars[m_Length + lenA] = 0
            End With
#else
            Return ConcatStrChar(This.Chars, m_Length, text, len)
#endif
        End Function

        Static Function Concat(x As String, y As String) As String
            If String.IsNullOrEmpty(x) Then
                Return y
            Else
                Return x.Concat(y.Chars, y.m_Length)
            End If
        End Function

        Static Function Concat(x As Object, y As Object) As String
            Return String.Concat(x.ToString, y.ToString)
        End Function

        Const Function Contains(s As String) As Boolean
            If Object.ReferenceEquals(s, Nothing) Then
                'Throw New ArgumentNullException
            End If
            Return IndexOf(s, 0, m_Length) >= 0
        End Function

        Const Function IndexOf(c As StrChar) As Long
            Return indexOfCore(c, 0, m_Length)
        End Function

        Const Function IndexOf(c As StrChar, start As Long) As Long
            rangeCheck(start)
            Return indexOfCore(c, start, m_Length - start)
        End Function

        Const Function IndexOf(c As StrChar, start As Long, count As Long) As Long
            rangeCheck(start, count)
            Return indexOfCore(c, start, count)
        End Function
    Private
        Const Function indexOfCore(c As StrChar, start As Long, count As Long) As Long
            indexOfCore = ActiveBasic.Strings.ChrFind(VarPtr(Chars[start]), count, c)
            If indexOfCore <> -1 Then
                indexOfCore += start
            End If
        End Function
    Public
        Const Function IndexOf(s As String) As Long
            Return IndexOf(s, 0, m_Length)
        End Function

        Const Function IndexOf(s As String, startIndex As Long) As Long
            Return IndexOf(s, startIndex, m_Length - startIndex)
        End Function

        Const Function IndexOf(s As String, startIndex As Long, count As Long) As Long
            rangeCheck(startIndex, count)
            If Object.ReferenceEquals(s, Nothing) Then
                'Throw New ArgumentNullException
                Debug
            End If

            Dim length = s.Length
            If length = 0 Then Return startIndex

            Dim i As Long, j As Long
            For i = startIndex To startIndex + count - 1
                For j = 0 To length - 1
                    If Chars[i + j] = s[j] Then
                        If j = length - 1 Then Return i
                    Else
                        Exit For
                    End If
                Next
            Next
            Return -1
        End Function

        Const Function LastIndexOf(s As String) As Long
            Return LastIndexOf(s, m_Length - 1, m_Length)
        End Function

        Const Function LastIndexOf(s As String, startIndex As Long) As Long
            Return LastIndexOf(s, startIndex, startIndex + 1)
        End Function

        Const Function LastIndexOf(s As String, startIndex As Long, count As Long) As Long
            If Object.ReferenceEquals(s, Nothing) Then
                'Throw New ArgumentNullException
                Debug
            End If

            If startIndex < 0 Or startIndex > m_Length - 1 Or _
                count < 0 Or count > startIndex + 2 Then
                'Throw New ArgumentOutOfRangeException
                Debug
            End If
            Dim length = s.Length
            If length > m_Length Then Return -1
            If length = 0 Then Return startIndex

            Dim i As Long, j As Long
            For i = startIndex To  startIndex - count + 1 Step -1
                For j = length - 1 To 0 Step -1
                    If Chars[i + j] = s[j] Then
                        If j = 0 Then Return i
                    Else
                        Exit For
                    End If
                Next
            Next
            Return -1
        End Function

        Const Function StartsWith(s As String) As Boolean
            Return IndexOf(s) = 0
        End Function

        Const Function EndsWith(s As String) As Boolean
            Return LastIndexOf(s) = m_Length - s.Length
        End Function

        Const Function Insert(startIndex As Long, text As String) As String
            Dim sb = New System.Text.StringBuilder(This)
            sb.Insert(startIndex, text)
            Return sb.ToString
        End Function

        Const Function Substring(startIndex As Long) As String
            rangeCheck(startIndex)
            Return Substring(startIndex, m_Length - startIndex)
        End Function

        Const Function Substring(startIndex As Long, length As Long) As String
            rangeCheck(startIndex, length)
            Return New String(Chars, startIndex, length)
        End Function

        Const Function Remove(startIndex As Long) As String
            rangeCheck(startIndex)
            Remove = Substring(0, startIndex)
        End Function

        Const Function Remove(startIndex As Long, count As Long) As String
            Dim sb = New System.Text.StringBuilder(This)
            sb.Remove(startIndex, count)
            Remove = sb.ToString
        End Function

        Static Function IsNullOrEmpty(s As String) As Boolean
            If Not Object.ReferenceEquals(s, Nothing) Then
                If s.m_Length > 0 Then
                    Return False
                End If
            End If
            Return True
        End Function

        Const Function Replace(oldChar As StrChar, newChar As StrChar) As String
            Dim sb = New System.Text.StringBuilder(This)
            sb.Replace(oldChar, newChar)
            Replace = sb.ToString
        End Function

        Const Function Replace(oldStr As String, newStr As String) As String
            Dim sb = New System.Text.StringBuilder(This)
            sb.Replace(oldStr, newStr)
            Return sb.ToString
        End Function

        Const Function ToLower() As String
            Dim sb = New System.Text.StringBuilder(m_Length)
            sb.Length = m_Length
            Dim i As Long
            For i = 0 To ELM(m_Length)
                sb[i] = _System_ASCII_ToLower(Chars[i])
            Next
            Return sb.ToString
        End Function

        Const Function ToUpper() As String
            Dim sb = New System.Text.StringBuilder(m_Length)
            sb.Length = m_Length
            Dim i As Long
            For i = 0 To ELM(m_Length)
                sb[i] = _System_ASCII_ToUpper(Chars[i])
            Next
            Return sb.ToString
        End Function

        Override Function ToString() As String
            ToString = This
        End Function

        Const Function Clone() As String
            Clone = This
        End Function

        Static Function Copy(s As String) As String
            Copy = New String(s.Chars, s.m_Length)
        End Function

        Sub CopyTo(sourceIndex As Long, destination As *StrChar, destinationIndex As Long, count As Long)
            ActiveBasic.Strings.ChrCopy(VarPtr(destination[destinationIndex]), VarPtr(Chars[sourceIndex]), count As SIZE_T)
        End Sub

        Override Function GetHashCode() As Long
#ifdef __STRING_IS_NOT_UNICODE
            Dim size = (m_Length + 1) >> 1
#else
            Dim size = m_Length
#endif
            Return _System_GetHashFromWordArray(Chars As *Word, size) Xor size
        End Function

        Function PadLeft(total As Long) As String
            PadLeft(total, &h30 As StrChar)
        End Function

        Function PadLeft(total As Long, c As StrChar) As String
            If total < 0 Then
                'Throw New ArgumentException
            End If
            If total >= m_Length Then
                Return This
            End If
            Dim sb = New System.Text.StringBuilder(total)
            sb.Append(c, total - m_Length)
            sb.Append(This)
            Return sb.ToString
        End Function

        Function PadRight(total As Long) As String
            PadRight(total, &h30 As StrChar)
        End Function

        Function PadRight(total As Long, c As StrChar) As String
            If total < 0 Then
                'Throw New ArgumentException
            End If
            If total >= m_Length Then
                Return This
            End If
            Dim sb = New System.Text.StringBuilder(total)
            sb.Append(This)
            sb.Append(c, total - m_Length)
            Return sb.ToString
        End Function
    Private
        Function AllocStringBuffer(textLength As Long) As *StrChar
            If textLength < 0 Then
                Return 0
            End If
            AllocStringBuffer = GC_malloc_atomic(SizeOf(StrChar) * (textLength + 1))
            If AllocStringBuffer = 0 Then
                'Throw New OutOfMemoryException
            End If
            m_Length = textLength
            Chars = AllocStringBuffer
        End Function

        Sub AssignFromStrChar(text As *StrChar, textLength As Long)
            AllocStringBuffer(textLength)
            ActiveBasic.Strings.ChrCopy(Chars, text, textLength As SIZE_T)
            Chars[m_Length] = 0
        End Sub

        Const Sub rangeCheck(index As Long)
            If index < 0 Or index > m_Length Then
                Debug 'ArgumentOutOfRangeException
            End If
        End Sub
        
        Const Sub rangeCheck(start As Long, length As Long)
            If start < 0 Or start > This.m_Length Or length < 0 Then
                Debug 'ArgumentOutOfRangeException
            End If
        End Sub
    End Class

End Namespace