422 lines
11 KiB
ObjectPascal
422 lines
11 KiB
ObjectPascal
{
|
|
Helpers functions for the X2Software XML Data Binding
|
|
|
|
Last changed: $Date$
|
|
Revision: $Rev$
|
|
URL: $URL$
|
|
}
|
|
unit XMLDataBindingUtils;
|
|
|
|
interface
|
|
uses
|
|
Classes,
|
|
SysUtils,
|
|
XMLIntf;
|
|
|
|
|
|
type
|
|
EBase64Error = class(Exception);
|
|
|
|
TXMLDateTimeFormat = (xdtDateTime, xdtDate, xdtTime);
|
|
TXMLTimeFragment = (xtfMilliseconds, xtfTimezone);
|
|
TXMLTimeFragments = set of TXMLTimeFragment;
|
|
|
|
|
|
const
|
|
AllTimeFragments = [Low(TXMLTimeFragment)..High(TXMLTimeFragment)];
|
|
|
|
|
|
|
|
function DateTimeToXML(ADate: TDateTime; AFormat: TXMLDateTimeFormat; ATimeFragments: TXMLTimeFragments = AllTimeFragments): string;
|
|
function XMLToDateTime(const ADate: string; AFormat: TXMLDateTimeFormat): TDateTime;
|
|
|
|
function BoolToXML(AValue: Boolean): WideString;
|
|
function XMLToBool(const AValue: WideString): Boolean;
|
|
|
|
function FloatToXML(AValue: Extended): WideString;
|
|
function XMLToFloat(const AValue: WideString): Extended;
|
|
|
|
function Base64Encode(AValue: String): String;
|
|
function Base64Decode(AValue: String): String;
|
|
|
|
function GetNodeIsNil(ANode: IXMLNode): Boolean;
|
|
procedure SetNodeIsNil(ANode: IXMLNode; ASetNil: Boolean);
|
|
|
|
|
|
const
|
|
XMLSchemaInstanceURI = 'http://www.w3.org/2001/XMLSchema-instance';
|
|
|
|
XMLDateFormat = 'yyyy"-"mm"-"dd';
|
|
XMLTimeFormat = 'hh":"nn":"ss';
|
|
XMLMsecsFormat = '"."zzz';
|
|
XMLTimezoneZulu = 'Z';
|
|
XMLTimezoneFormat = '%s%.2d:%.2d';
|
|
|
|
XMLDateTimeFormats: array[TXMLDateTimeFormat] of String =
|
|
(
|
|
XMLDateFormat + '"T"' + XMLTimeFormat,
|
|
XMLDateFormat,
|
|
XMLTimeFormat
|
|
);
|
|
|
|
XMLTimezoneSigns: array[Boolean] of Char = ('-', '+');
|
|
XMLBoolValues: array[Boolean] of String =
|
|
(
|
|
'false',
|
|
'true'
|
|
);
|
|
|
|
XMLIsNilAttribute = 'nil';
|
|
|
|
Base64ValidChars = ['A'..'Z', 'a'..'z', '0'..'9', '+', '/'];
|
|
Base64LookupTable = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' +
|
|
'abcdefghijklmnopqrstuvwxyz' +
|
|
'0123456789+/';
|
|
Base64Padding = '=';
|
|
|
|
|
|
implementation
|
|
uses
|
|
DateUtils,
|
|
Windows;
|
|
|
|
|
|
function DateTimeToXML(ADate: TDateTime; AFormat: TXMLDateTimeFormat; ATimeFragments: TXMLTimeFragments): string;
|
|
var
|
|
formatSettings: TFormatSettings;
|
|
timeZone: TTimeZoneInformation;
|
|
timeOffset: Integer;
|
|
|
|
begin
|
|
GetLocaleFormatSettings(LOCALE_SYSTEM_DEFAULT, formatSettings);
|
|
Result := FormatDateTime(XMLDateTimeFormats[AFormat], ADate, formatSettings);
|
|
|
|
if AFormat in [xdtDateTime, xdtTime] then
|
|
begin
|
|
if xtfMilliseconds in ATimeFragments then
|
|
Result := Result + FormatDateTime(XMLMsecsFormat, ADate);
|
|
|
|
if xtfTimezone in ATimeFragments then
|
|
begin
|
|
FillChar(timeZone, SizeOf(TTimeZoneInformation), #0);
|
|
if GetTimeZoneInformation(timeZone) <> TIME_ZONE_ID_INVALID then
|
|
begin
|
|
timeOffset := -timeZone.Bias;
|
|
|
|
if timeOffset = 0 then
|
|
Result := Result + XMLTimezoneZulu
|
|
else
|
|
Result := Result + Format(XMLTimezoneFormat,
|
|
[XMLTimezoneSigns[timeOffset > 0],
|
|
Abs(timeZone.Bias div 60),
|
|
Abs(timeZone.Bias mod 60)]);
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function XMLToDateTime(const ADate: string; AFormat: TXMLDateTimeFormat): TDateTime;
|
|
const
|
|
{ yyyy-mm-ddThh:nn:ss.zzz+xx:xx }
|
|
XMLTimeSeparatorPos = 11;
|
|
XMLTimeSeparator = 'T';
|
|
XMLMinTimeLength = 8;
|
|
|
|
var
|
|
date: string;
|
|
time: string;
|
|
year: Integer;
|
|
month: Integer;
|
|
day: Integer;
|
|
hour: Integer;
|
|
minute: Integer;
|
|
second: Integer;
|
|
msec: Integer;
|
|
hasTimezone: Boolean;
|
|
xmlOffset: Integer;
|
|
timeZone: TTimeZoneInformation;
|
|
localOffset: Integer;
|
|
|
|
begin
|
|
Result := 0;
|
|
date := '';
|
|
time := '';
|
|
|
|
case AFormat of
|
|
xdtDateTime:
|
|
begin
|
|
if (Length(ADate) < XMLTimeSeparatorPos) or
|
|
(ADate[XMLTimeSeparatorPos] <> XMLTimeSeparator) then
|
|
Exit;
|
|
|
|
date := ADate;
|
|
time := ADate;
|
|
SetLength(date, Pred(XMLTimeSeparatorPos));
|
|
Delete(time, 1, XMLTimeSeparatorPos);
|
|
end;
|
|
|
|
xdtDate:
|
|
begin
|
|
if Length(ADate) < Pred(XMLTimeSeparatorPos) then
|
|
Exit;
|
|
|
|
date := ADate;
|
|
end;
|
|
|
|
xdtTime:
|
|
begin
|
|
if Length(ADate) < XMLMinTimeLength then
|
|
Exit;
|
|
|
|
time := ADate;
|
|
end;
|
|
end;
|
|
|
|
if AFormat in [xdtDateTime, xdtDate] then
|
|
begin
|
|
{ Parse date (yyyy-mm-hh) }
|
|
if TryStrToInt(Copy(date, 1, 4), year) and
|
|
TryStrToInt(Copy(date, 6, 2), month) and
|
|
TryStrToInt(Copy(date, 9, 2), day) then
|
|
Result := EncodeDate(year, month, day);
|
|
end;
|
|
|
|
if AFormat in [xdtDateTime, xdtTime] then
|
|
begin
|
|
{ Parse time (hh:nn:ss) }
|
|
if TryStrToInt(Copy(time, 1, 2), hour) and
|
|
TryStrToInt(Copy(time, 4, 2), minute) and
|
|
TryStrToInt(Copy(time, 7, 2), second) then
|
|
begin
|
|
msec := 0;
|
|
Delete(time, 1, 8);
|
|
|
|
if Length(time) > 0 then
|
|
begin
|
|
if time[1] = '.' then
|
|
begin
|
|
{ Parse milliseconds (.zzz) }
|
|
if not TryStrToInt(Copy(time, 2, 3), msec) then
|
|
msec := 0;
|
|
|
|
Delete(time, 1, 4);
|
|
end;
|
|
end;
|
|
|
|
Result := Result + EncodeTime(hour, minute, second, msec);
|
|
|
|
if Length(time) > 0 then
|
|
begin
|
|
hasTimezone := False;
|
|
xmlOffset := 0;
|
|
|
|
if time[1] = XMLTimezoneZulu then
|
|
begin
|
|
{ Zulu time }
|
|
hasTimezone := True;
|
|
end else if time[1] in [XMLTimezoneSigns[False], XMLTimezoneSigns[True]] then
|
|
begin
|
|
{ Parse timezone ([+|-]xx:xx) }
|
|
if TryStrToInt(Copy(time, 2, 2), hour) and
|
|
TryStrToInt(Copy(time, 5, 2), minute) then
|
|
begin
|
|
xmlOffset := (hour * MinsPerHour) + minute;
|
|
hasTimezone := True;
|
|
|
|
if time[1] = XMLTimezoneSigns[False] then
|
|
xmlOffset := -xmlOffset;
|
|
end;
|
|
end;
|
|
|
|
if hasTimezone then
|
|
begin
|
|
FillChar(timeZone, SizeOf(TTimeZoneInformation), #0);
|
|
if GetTimeZoneInformation(timeZone) <> TIME_ZONE_ID_INVALID then
|
|
begin
|
|
localOffset := -timeZone.Bias;
|
|
Result := IncMinute(Result, localOffset - xmlOffset);
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
end;
|
|
|
|
|
|
function BoolToXML(AValue: Boolean): WideString;
|
|
begin
|
|
Result := XMLBoolValues[AValue];
|
|
end;
|
|
|
|
|
|
function XMLToBool(const AValue: WideString): Boolean;
|
|
begin
|
|
Result := StrToBoolDef(AValue, False);
|
|
end;
|
|
|
|
|
|
function GetXMLFloatFormatSettings(): TFormatSettings;
|
|
begin
|
|
Result.DecimalSeparator := '.';
|
|
end;
|
|
|
|
|
|
function FloatToXML(AValue: Extended): WideString;
|
|
begin
|
|
Result := FloatToStr(AValue, GetXMLFloatFormatSettings());
|
|
end;
|
|
|
|
|
|
function XMLToFloat(const AValue: WideString): Extended;
|
|
begin
|
|
Result := StrToFloat(AValue, GetXMLFloatFormatSettings());
|
|
end;
|
|
|
|
|
|
function Base64Encode(AValue: String): String;
|
|
var
|
|
pos: Integer;
|
|
lookupIndex: array[0..3] of Byte;
|
|
padCount: Integer;
|
|
|
|
begin
|
|
Result := '';
|
|
if Length(AValue) = 0 then
|
|
exit;
|
|
|
|
padCount := 0;
|
|
|
|
{ At least 3 input bytes are required, and the input must be a multiple of 3 }
|
|
if Length(AValue) < 3 then
|
|
padCount := 3 - Length(AValue)
|
|
else if Length(AValue) mod 3 <> 0 then
|
|
padCount := 3 - (Length(AValue) mod 3);
|
|
|
|
if padCount > 0 then
|
|
AValue := AValue + StringOfChar(#0, padCount);
|
|
|
|
pos := 1;
|
|
|
|
{ Process in 3-byte blocks }
|
|
while pos <= Length(AValue) - 2 do
|
|
begin
|
|
{ Each 3 input bytes are converted into 4 index values
|
|
in the range of 0..63, by taking 6 bits each step.
|
|
|
|
6 high bytes of first char }
|
|
lookupIndex[0] := (Ord(AValue[pos]) shr 2) and $3F;
|
|
|
|
{ 2 low bytes of first char + 4 high bytes of second char }
|
|
lookupIndex[1] := ((Ord(AValue[pos]) shl 4) and $3F) or
|
|
(Ord(AValue[pos + 1]) shr 4);
|
|
|
|
{ 4 low bytes of second char + 2 high bytes of third char }
|
|
lookupIndex[2] :=((Ord(AValue[pos + 1]) shl 2) and $3F) or
|
|
(Ord(AValue[pos + 2]) shr 6);
|
|
|
|
{ 6 low bytes of third char }
|
|
lookupIndex[3] := Ord(AValue[pos + 2]) and $3F;
|
|
|
|
Result := Result + Base64LookupTable[lookupIndex[0] + 1] +
|
|
Base64LookupTable[lookupIndex[1] + 1] +
|
|
Base64LookupTable[lookupIndex[2] + 1] +
|
|
Base64LookupTable[lookupIndex[3] + 1];
|
|
Inc(pos, 3);
|
|
end;
|
|
|
|
{ Replace padding }
|
|
if padCount > 0 then
|
|
begin
|
|
for pos := Length(Result) downto Length(Result) - Pred(padCount) do
|
|
Result[pos] := Base64Padding;
|
|
end;
|
|
end;
|
|
|
|
|
|
function Base64LookupIndex(AChar: Char): Byte;
|
|
var
|
|
lookupIndex: Integer;
|
|
|
|
begin
|
|
Result := Ord(Base64Padding);
|
|
|
|
for lookupIndex := 1 to Length(Base64LookupTable) do
|
|
if Base64LookupTable[lookupIndex] = AChar then
|
|
begin
|
|
Result := Pred(lookupIndex);
|
|
break;
|
|
end;
|
|
end;
|
|
|
|
|
|
function Base64Decode(AValue: String): String;
|
|
var
|
|
pos: Integer;
|
|
padCount: Integer;
|
|
value: Byte;
|
|
|
|
begin
|
|
Result := '';
|
|
if Length(AValue) = 0 then
|
|
exit;
|
|
|
|
if Length(AValue) mod 4 <> 0 then
|
|
raise EBase64Error.Create('Value length must be a multiple of 4');
|
|
|
|
padCount := 0;
|
|
pos := Length(AValue);
|
|
|
|
{ Count padding chars }
|
|
while (pos > 0) and (AValue[pos] = Base64Padding) do
|
|
begin
|
|
Inc(padCount);
|
|
Dec(pos);
|
|
end;
|
|
|
|
Result := '';
|
|
pos := 1;
|
|
|
|
while pos <= Length(AValue) - 3 do
|
|
begin
|
|
value := (Base64LookupIndex(AValue[pos]) shl 2) or
|
|
(Base64LookupIndex(AValue[pos + 1]) shr 4);
|
|
Result := Result + Chr(value);
|
|
|
|
value := (Base64LookupIndex(AValue[pos + 1]) shl 4) or
|
|
(Base64LookupIndex(AValue[pos + 2]) shr 2);
|
|
Result := Result + Chr(value);
|
|
|
|
value := (Base64LookupIndex(AValue[pos + 2]) shl 6) or
|
|
(Base64LookupIndex(AValue[pos + 3]));
|
|
Result := Result + Chr(value);
|
|
|
|
Inc(pos, 4);
|
|
end;
|
|
|
|
{ Delete padding }
|
|
if padCount > 0 then
|
|
SetLength(Result, Length(Result) - padCount);
|
|
end;
|
|
|
|
|
|
function GetNodeIsNil(ANode: IXMLNode): Boolean;
|
|
begin
|
|
Result := ANode.HasAttribute(XMLIsNilAttribute, XMLSchemaInstanceURI) and
|
|
XMLToBool(ANode.GetAttributeNS(XMLIsNilAttribute, XMLSchemaInstanceURI));
|
|
end;
|
|
|
|
|
|
procedure SetNodeIsNil(ANode: IXMLNode; ASetNil: Boolean);
|
|
begin
|
|
if ASetNil then
|
|
begin
|
|
ANode.ChildNodes.Clear;
|
|
ANode.SetAttributeNS(XMLIsNilAttribute, XMLSchemaInstanceURI, BoolToXML(True));
|
|
end else
|
|
ANode.AttributeNodes.Delete(XMLIsNilAttribute, XMLSchemaInstanceURI);
|
|
end;
|
|
|
|
end.
|
|
|