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|
Uses TypInfo;
Function StyleToString( styles: TFontStyles ): String;
var
style: TFontStyle;
Begin
Result := '[';
For style := Low(style) To High(style) Do Begin
If style IN styles Then Begin
If Length(result) > 1 Then
result := result + ',';
result := result + GetEnumname( typeInfo(TFontStyle), Ord(style));
End; { If }
End; { For }
Result := Result + ']';
End; { StyleToString }
Function StringToStyle( S: String ): TFontStyles;
Var
sl : TStringlist;
style: TfontStyle;
i : Integer;
Begin
Result := [];
If Length(S) < 2 Then Exit;
If S[1] = '[' Then
Delete(S, 1, 1);
If S[Length(S)] = ']' Then
Delete(S, Length(S), 1);
If Length(S) = 0 Then Exit;
sl:= TStringlist.Create;
try
sl.commatext := S;
For i := 0 To sl.Count-1 Do Begin
try
style := TFontStyle( GetEnumValue( Typeinfo(TFontStyle), sl[i]
));
Include( Result, style );
except
end;
End; { For }
finally
sl.free
end;
End; { StringToStyle }
The problem with this is that the string can get quite long, so it is
not an efficient storage format. A more compact text format would be
the mentioned string of 0 and 1 digits:
type
EFontBitstringError = class(Exception);
const
FalseBitDigit = '0';
TrueBitDigit = '1';
BitDigits : array [boolean] of char = (FalseBitDigit,TrueBitDigit);
function StyleToBitstring( styles: TFontStyles ): String;
var
style: TFontStyle;
begin
SetLength(Result, Ord(High(Style)) - Ord(Low(Style)) + 1);
for style := Low(style) to High(style) do
Result[Ord(style) - Ord(Low(style)) + 1] :=
BitDigits[style In Styles];
end; { StyleToBitstring }
function BitstringToStyle(const S: String): TFontStyles;
var
style: TFontStyle;
N: Integer;
begin
Result := [];
N:= 0;
for style := Low(style) to High(style) do begin
Inc(N);
if (N > 0) and (N <= Length(S)) then
case S[N] of
FalseBitDigit: ; // nothing to do
TrueBitDigit : Include(Result, style);
else
raise EFontBitstringError.CreateFmt(
'Invalid character "%s" in bitstring "%s"!', [S[N], N]);
end; {case}
end; {for}
end; {BitstringToStyle} Uses TypInfo;
Function StyleToString( styles: TFontStyles ): String;
var
style: TFontStyle;
Begin
Result := '[';
For style := Low(style) To High(style) Do Begin
If style IN styles Then Begin
If Length(result) > 1 Then
result := result + ',';
result := result + GetEnumname( typeInfo(TFontStyle), Ord(style));
End; { If }
End; { For }
Result := Result + ']';
End; { StyleToString }
Function StringToStyle( S: String ): TFontStyles;
Var
sl : TStringlist;
style: TfontStyle;
i : Integer;
Begin
Result := [];
If Length(S) < 2 Then Exit;
If S[1] = '[' Then
Delete(S, 1, 1);
If S[Length(S)] = ']' Then
Delete(S, Length(S), 1);
If Length(S) = 0 Then Exit;
sl:= TStringlist.Create;
try
sl.commatext := S;
For i := 0 To sl.Count-1 Do Begin
try
style := TFontStyle( GetEnumValue( Typeinfo(TFontStyle), sl[i]
));
Include( Result, style );
except
end;
End; { For }
finally
sl.free
end;
End; { StringToStyle }
The problem with this is that the string can get quite long, so it is
not an efficient storage format. A more compact text format would be
the mentioned string of 0 and 1 digits:
type
EFontBitstringError = class(Exception);
const
FalseBitDigit = '0';
TrueBitDigit = '1';
BitDigits : array [boolean] of char = (FalseBitDigit,TrueBitDigit);
function StyleToBitstring( styles: TFontStyles ): String;
var
style: TFontStyle;
begin
SetLength(Result, Ord(High(Style)) - Ord(Low(Style)) + 1);
for style := Low(style) to High(style) do
Result[Ord(style) - Ord(Low(style)) + 1] :=
BitDigits[style In Styles];
end; { StyleToBitstring }
function BitstringToStyle(const S: String): TFontStyles;
var
style: TFontStyle;
N: Integer;
begin
Result := [];
N:= 0;
for style := Low(style) to High(style) do begin
Inc(N);
if (N > 0) and (N <= Length(S)) then
case S[N] of
FalseBitDigit: ; // nothing to do
TrueBitDigit : Include(Result, style);
else
raise EFontBitstringError.CreateFmt(
'Invalid character "%s" in bitstring "%s"!', [S[N], N]);
end; {case}
end; {for}
end; {BitstringToStyle} |
