41427 2010-06-30 14:03:29 -0700 Add expat based XMLDocumentParser 2010-07-27 15:13:18 -0700 1 1 1 Unclassified WebKit XML 528+ (Nightly build) PC OS X 10.5 RESOLVED WONTFIX P2 Normal --- 43085 0 paroga webkit-unassigned ap darin oldest_to_newest 244922 0 paroga 2010-06-30 14:03:29 -0700 see patch 244923 1 60147 paroga 2010-06-30 14:04:13 -0700 Created attachment 60147 Patch 244926 2 60147 darin 2010-06-30 14:06:50 -0700 Comment on attachment 60147 Patch Why? We really don’t want a third one of these! 245143 3 paroga 2010-07-01 00:00:15 -0700 (In reply to comment #2) > (From update of attachment 60147 [details]) > Why? The main reason was that I had problems to get libxml working. When you look at the libxml parser you have many toString() calls, which do UTF-8 decoding. This isn't necessary with expat, because it can return UTF-16 strings directly. I din't had the time to do performance tests, but expat is usually a little faster than libxml. > We really don’t want a third one of these! Then you won't accecpt a MSXML implementation too? (will save memory when using the windows system library) What do you think about a "native WebKit XMLParser" with no 3rdparty dependency? 245473 4 ap 2010-07-01 12:18:21 -0700 A native XML engine would be good in that it would allow for a much more efficient and compliant XSLT implementation, as well as sharing code with XPath. But it would take a lot of resources to write and maintain. 254836 5 paroga 2010-07-22 08:59:40 -0700 Some performance data*: libxml2 expat percent 5MB SVG: 0.7183sec 0.5356sec -25% 10MB SVG: 1.6084sec 1.2298sec -24% 20MB SVG: 5.4084sec 4.6952sec -13% * time from begin of first XMLDocumentParser::doWrite until end of XMLDocumentParser::doEnd, average of 3 measurements 254865 6 ap 2010-07-22 10:14:32 -0700 A port that does not use libxml2 has no practical way to implement XSLT, is that correct? 254867 7 paroga 2010-07-22 10:19:26 -0700 (In reply to comment #6) > A port that does not use libxml2 has no practical way to implement XSLT, is that correct? Yes that is correct, libxlst needs libxml2. I don't think that expat is a real option for "fat clients" but as an alternative without XLST support (on small devices). The table in comment #5 shows that there is much room for improvements in the XML parser. 256574 8 60147 abarth 2010-07-27 07:34:04 -0700 Comment on attachment 60147 Patch I really don't like the idea of adding a third (!) XML parser. It's bad enough that we have three. If we can improve perf by switching our XML parser, that's great, but we should kill the old one. IMHO, adding the second XML parser was a mistake too. 256879 9 paroga 2010-07-27 15:12:25 -0700 (In reply to comment #8) > (From update of attachment 60147 [details]) > I really don't like the idea of adding a third (!) XML parser. It's bad enough that we have three. If we can improve perf by switching our XML parser, that's great, but we should kill the old one. IMHO, adding the second XML parser was a mistake too. I agree with you 100%. My expat version was mainly a quick hack to show the possible speed increase of the XMLParser. It can't be a full replacement beacause of the missing xlst support :-(. I've created a new bug for this issue at bug 43085. I think there is no way around to implement a full native WebKit XMLParser? 60147 2010-06-30 14:04:13 -0700 2010-07-27 07:34:04 -0700 Patch bug-41427.patch text/plain 33328 paroga SW5kZXg6IFdlYkNvcmUvQ2hhbmdlTG9nDQo9PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09DQotLS0gV2ViQ29yZS9DaGFuZ2VM b2cJKHJldmlzaW9uIDYyMTk4KQ0KKysrIFdlYkNvcmUvQ2hhbmdlTG9nCSh3b3JraW5nIGNvcHkp DQpAQCAtMSwzICsxLDY3IEBADQorMjAxMC0wNi0zMCAgUGF0cmljayBHYW5zdGVyZXIgIDxwYXJv Z2FAcGFyb2dhLmNvbT4KKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKwor ICAgICAgICBBZGQgZXhwYXQgYmFzZWQgWE1MRG9jdW1lbnRQYXJzZXIuCisgICAgICAgIGh0dHBz Oi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVnLmNnaT9pZD00MTQyNworCisgICAgICAgICogZG9t L1hNTERvY3VtZW50UGFyc2VyLmNwcDoKKyAgICAgICAgKFdlYkNvcmU6OlhNTERvY3VtZW50UGFy c2VyOjplbnRlclRleHQpOgorICAgICAgICAoV2ViQ29yZTo6WE1MRG9jdW1lbnRQYXJzZXI6OmV4 aXRUZXh0KToKKyAgICAgICAgKiBkb20vWE1MRG9jdW1lbnRQYXJzZXIuaDoKKyAgICAgICAgKFdl 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