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MFPC.LazUtils.Masks.pas
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MFPC.LazUtils.Masks.pas
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{
*****************************************************************************
This file is part of LazUtils.
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
}
{
jpmod: Removed dependency on "Classes" unit
2018.02.11
=========================================================
FPC 3.1.1 rev. 37820 (trunk)
=========================================================
Original file: lazarus\components\lazutils\masks.pas
Removed routines & classes:
TParseStringList (c)
TMaskList (c)
MatchesMaskList (f)
MatchesWindowsMaskList (f)
}
unit MFPC.LazUtils.Masks;
{$mode objfpc}{$H+}
interface
uses
// For Smart Linking: Do not use the LCL!
//Classes,
SysUtils,
//Contnrs,
MFPC.LazUtilsStrConsts, MFPC.LazUtils.LazUTF8;
type
TMaskCharType = (mcChar, mcCharSet, mcAnyChar, mcAnyText);
TCharSet = set of Char;
PCharSet = ^TCharSet;
TUtf8Char = String[7];
TMaskChar = record
case CharType: TMaskCharType of
mcChar: (CharValue: TUtf8Char);
mcCharSet: (Negative: Boolean; SetValue: PCharSet);
mcAnyChar, mcAnyText: ();
end;
TMaskString = record
MinLength: Integer;
MaxLength: Integer;
Chars: Array of TMaskChar;
end;
{ TMask }
TMask = class
private
FMask: TMaskString;
fCaseSensitive: Boolean;
fInitialMask: String;
procedure InitMaskString(const AValue: String; const CaseSensitive: Boolean);
procedure ClearMaskString;
public
constructor Create(const AValue: String; const CaseSensitive: Boolean = False);
destructor Destroy; override;
function Matches(const AFileName: String): Boolean;
function MatchesWindowsMask(const AFileName: String): Boolean;
end;
function MatchesMask(const FileName, Mask: String; const CaseSensitive: Boolean = False): Boolean;
function MatchesWindowsMask(const FileName, Mask: String; const CaseSensitive: Boolean = False): Boolean;
implementation
//Utf8 helper functions
function GetCodePoint(const S: String; const Index: PtrInt): TUTF8Char;
//equivalent for Result := S[Index], but for Utf8 encoded strings
var
p: PChar;
PLen: PtrInt;
Res: AnsiString; //intermediate needed for PChar -> String -> ShortString assignement
begin
Result := '';
p := UTF8CodepointStart(PChar(S), Length(S), Index - 1); //zero-based call
//determine the length in bytes of this UTF-8 character
PLen := UTF8CodepointSize(p);
Res := p;
//Set correct length for Result (otherwise it returns all chars up to the end of the original string)
SetLength(Res,PLen);
Result := Res;
end;
function MatchesMask(const FileName, Mask: String; const CaseSensitive: Boolean): Boolean;
var
AMask: TMask;
begin
AMask := TMask.Create(Mask, CaseSensitive);
try
Result := AMask.Matches(FileName);
finally
AMask.Free;
end;
end;
function MatchesWindowsMask(const FileName, Mask: String; const CaseSensitive: Boolean): Boolean;
var
AMask: TMask;
begin
AMask := TMask.Create(Mask, CaseSensitive);
try
Result := AMask.MatchesWindowsMask(FileName);
finally
AMask.Free;
end;
end;
{$region ' TMask '}
procedure TMask.InitMaskString(const AValue: String; const CaseSensitive: Boolean);
var
I: Integer;
SkipAnyText: Boolean;
procedure CharSetError;
begin
raise EConvertError.CreateFmt(lrsInvalidCharSet, [AValue]);
end;
procedure AddAnyText;
begin
if SkipAnyText then
begin
Inc(I);
Exit;
end;
SetLength(FMask.Chars, Length(FMask.Chars) + 1);
FMask.Chars[High(FMask.Chars)].CharType := mcAnyText;
FMask.MaxLength := MaxInt;
SkipAnyText := True;
Inc(I);
end;
procedure AddAnyChar;
begin
SkipAnyText := False;
SetLength(FMask.Chars, Length(FMask.Chars) + 1);
FMask.Chars[High(FMask.Chars)].CharType := mcAnyChar;
Inc(FMask.MinLength);
if FMask.MaxLength < MaxInt then Inc(FMask.MaxLength);
Inc(I);
end;
procedure AddCharSet;
var
CharSet: TCharSet;
Valid: Boolean;
C, Last: Char;
CP: TUtf8Char;
begin
SkipAnyText := False;
SetLength(FMask.Chars, Length(FMask.Chars) + 1);
FMask.Chars[High(FMask.Chars)].CharType := mcCharSet;
Inc(I);
if (I <= Utf8Length(AValue)) and (GetCodePoint(AValue,I) = '!') then
begin
FMask.Chars[High(FMask.Chars)].Negative := True;
Inc(I);
end
else FMask.Chars[High(FMask.Chars)].Negative := False;
Last := '-';
CharSet := [];
Valid := False;
while I <= Utf8Length(AValue) do
begin
CP := GetCodePoint(AValue,I);
//CharSets can only contain 1-byte codepoints
if (Length(CP) <> 1) then CharSetError;
case CP of
'-':
begin
if Last = '-' then CharSetError;
Inc(I);
if (I > Utf8Length(AValue)) then CharSetError;
CP := GetCodePoint(AValue, I);
if (Length(CP) <> 1) then CharSetError;
if fCaseSensitive then
begin
//writeln('MaskUtf8: Set: ' + Last + '-' + (CP[1]));
for C := Last to CP[1] do
Include(CharSet, C)
end
else
begin
//writeln('MaskUtf8: Set: ' + Last + '-' + UpCase(CP[1]));
for C := Last to LowerCase(CP[1]) do
Include(CharSet, C)
end;
Inc(I);
end;
']':
begin
Valid := True;
Break;
end;
else
begin
if fCaseSensitive then
Last := CP[1]
else
Last := LowerCase(CP[1]);
Include(CharSet, Last);
Inc(I);
end;
end;
end;
if (not Valid) or (CharSet = []) then CharSetError;
New(FMask.Chars[High(FMask.Chars)].SetValue);
FMask.Chars[High(FMask.Chars)].SetValue^ := CharSet;
Inc(FMask.MinLength);
if FMask.MaxLength < MaxInt then Inc(FMask.MaxLength);
Inc(I);
end;
procedure AddChar;
begin
SkipAnyText := False;
SetLength(FMask.Chars, Length(FMask.Chars) + 1);
with FMask.Chars[High(FMask.Chars)] do
begin
CharType := mcChar;
if fCaseSensitive then
CharValue := GetCodePoint(AValue,I)
else
CharValue := Utf8LowerCase(GetCodePoint(AValue,I));
end;
Inc(FMask.MinLength);
if FMask.MaxLength < MaxInt then Inc(FMask.MaxLength);
Inc(I);
end;
begin
fCaseSensitive:=CaseSensitive;
SetLength(FMask.Chars, 0);
FMask.MinLength := 0;
FMask.MaxLength := 0;
SkipAnyText := False;
I := 1;
while I <= Utf8Length(AValue) do
begin
case GetCodePoint(AValue,I) of
'*': AddAnyText;
'?': AddAnyChar;
'[': AddCharSet;
else AddChar;
end;
end;
end;
procedure TMask.ClearMaskString;
var
I: Integer;
begin
for I := 0 to High(FMask.Chars) do
if FMask.Chars[I].CharType = mcCharSet then
Dispose(FMask.Chars[I].SetValue);
end;
constructor TMask.Create(const AValue: String; const CaseSensitive: Boolean);
begin
fInitialMask := AValue;
fCaseSensitive := CaseSensitive;
InitMaskString(AValue, CaseSensitive);
end;
destructor TMask.Destroy;
begin
ClearMaskString;
inherited Destroy;
end;
function TMask.Matches(const AFileName: String): Boolean;
var
L: Integer;
S: String;
function MatchToEnd(MaskIndex, CharIndex: Integer): Boolean;
var
I, J: Integer;
CP: TUtf8Char;
begin
Result := False;
for I := MaskIndex to High(FMask.Chars) do
begin
case FMask.Chars[I].CharType of
mcChar:
begin
if CharIndex > L then Exit;
//DebugLn('Match ' + S[CharIndex] + '<?>' + FMask.Chars[I].CharValue);
if GetCodePoint(S,CharIndex) <> FMask.Chars[I].CharValue then Exit;
Inc(CharIndex);
end;
mcCharSet:
begin
if CharIndex > L then Exit;
CP := GetCodePoint(S, CharIndex);
//There are only 1-byte codepoints in charsets
if (Length(CP) <> 1) then Exit;
if FMask.Chars[I].Negative xor
(Cp[1] in FMask.Chars[I].SetValue^) then Inc(CharIndex)
else Exit;
end;
mcAnyChar:
begin
//CP := GetCodePoint(S, CharIndex);
//writeln('mcAnyChar: CP = ',UTF8ToConsole(CP),' CharIndex = ',CharIndex);
if CharIndex > L then Exit;
Inc(CharIndex);
end;
mcAnyText:
begin
if I = High(FMask.Chars) then
begin
Result := True;
Exit;
end;
for J := CharIndex to L do
if MatchToEnd(I + 1, J) then
begin
Result := True;
Exit;
end;
end;
end;
end;
Result := CharIndex > L;
end;
begin
Result := False;
L := Utf8Length(AFileName);
if L = 0 then
begin
if FMask.MinLength = 0 then Result := True;
Exit;
end;
if (L < FMask.MinLength) or (L > FMask.MaxLength) then Exit;
if fCaseSensitive then
S := AFileName
else
begin
S := Utf8LowerCase(AFileName);
L := Utf8Length(S);
end;
Result := MatchToEnd(0, 1);
end;
function TMask.MatchesWindowsMask(const AFileName: String): Boolean;
var
NewMaskValue, Ext: String;
begin
// treat initial mask differently for special cases:
// foo*.* -> foo*
// foo*. -> match foo*, but muts not have an extension
// *. -> any file without extension ( .foo is a filename without extension according to Windows)
// foo. matches only foo but not foo.txt
// foo.* -> match either foo or foo.*
if (Utf8Length(fInitialMask) > 2) and (Utf8RightStr(fInitialMask,3) = '*.*') then
// foo*.*
begin
NewMaskValue := Utf8Copy(fInitialMask,1,Utf8Length(fInitialMask)-2);
ClearMaskString;
InitMaskString(NewMaskValue, fCaseSensitive);
Result := Matches(AFileName);
//Restore initial state of FMask
ClearMaskString;
InitMaskString(fInitialMask, fCaseSensitive);
end
//else if (Length(fInitialMask) > 1) and (RightStr(fInitialMask,2) = '*.') then
else if (Utf8Length(fInitialMask) > 1) and (GetCodePoint(fInitialMask,Utf8Length(fInitialMask)) = '.') then
//foo*. or *. or foo.
begin
//if AFileName has an extension then Result is False, otherwise see if it matches foo*/foo
//a filename like .foo under Windows is considered to be a file without an extension
Ext := ExtractFileExt(AFileName);
if (Ext = '') or (Ext = AFileName) then
begin
NewMaskValue := Utf8Copy(fInitialMask,1,Utf8Length(fInitialMask)-1);
ClearMaskString;
InitMaskString(NewMaskValue, fCaseSensitive);
Result := Matches(AFileName);
//Restore initial state of FMask
ClearMaskString;
InitMaskString(fInitialMask, fCaseSensitive);
end
else
begin
Result := False;
end;
end
else if (Utf8Length(fInitialMask) > 2) and (Utf8RightStr(fInitialMask,2) = '.*') then
//foo.* (but not '.*')
begin
//First see if we have 'foo'
if fCaseSensitive then
Result := (AFileName = Utf8Copy(fInitialMask,1,Utf8Length(fInitialMask)-2))
else
Result := (Utf8CompareText(AFileName,Utf8Copy(fInitialMask,1,Utf8Length(fInitialMask)-2)) = 0);
if not Result then Result := Matches(AFileName);
end
else
//all other cases just call Matches()
begin
Result := Matches(AFileName);
end;
end;
{$endregion TMask}
end.