On Sun, 30 Jul 2017, Michalis Kamburelis via Lazarus wrote:
2017-07-30 10:00 GMT+02:00 Michael Van Canneyt via Lazarus
<[email protected]>:
On Sat, 29 Jul 2017, Marcos Douglas B. Santos via Lazarus wrote:
Hi,
Nowadays, we have full Unicode support in FPC.
So, my question is: The units bellow is still necessary to use XML
with Lazarus or we can use just the original provided by FCL?
laz2_DOM
laz2_XMLRead
laz2_XMLWrite
laz2_XMLCfg
laz2_XMLUtils
laz_XMLStreaming
The FPC units use UnicodeString (UTF16), the lazarus units use UTF8.
If the end result is used excluively in UTF8 strings, the lazarus version
may be
faster as there will be less conversions.
I wonder if we can move the UTF8-based XML units to FPC, to be
available in the main FPC distribution too? (Possibly renamed like
Utf8_XMLXxx or such, instead of LazX_XMLXxx.)
The reason I ask:
This requirement (wanting to have XML units based on AnsiStrings, not
WideStrings, because your data is almost always in UTF8 and you're
fine storing it in AnsiString ) is not really specific to Lazarus, or
applications build on top of Lazarus. E.g. in Castle Game Engine I
would prefer using UTF8-based XML units too, I often read UTF8 XML
files (like X3D, Collada 3D models). But I don't want the "core" CGE
to depend on LCL (this makes the process of building and testing
simpler -- you can use CGE components in Lazarus, but you can also use
CGE with our own minimalistic window management without Lazarus).
That is up to the Lazarus people. If they are fine with that: no problem for
FPC.
I do think that it probably uses some utility functions/units which
then also need to be included in FPC. It also means there are 2 codebases.
An alternative approach would be to do what we do in other units as well,
use 1 codebase for 2 kinds of strings:
unit dom;
Type
DOMString = UnicodeString;
{$DEFINE USEUNICODESTRING}
{$i DOMh.inc}
and
unit domutf8;
Type
DOMString = UTF8String;
{$DEFINE USEUTF8STRING}
{$i DOMh.inc}
etc.
Combined with some macro magic, I think this should be doable too.
Michael.
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