Subramanya Sastry has uploaded a new change for review.
https://gerrit.wikimedia.org/r/76842
Change subject: WIP: (Bug 52296) Delete empty autoinserted tags in the last DOM
pass
......................................................................
WIP: (Bug 52296) Delete empty autoinserted tags in the last DOM pass
* Normally td-tags should have a leading pipe-char in start-of-line
position. However, with buggy wikitext, table-row tag ("|-")
is followed by text on a new line without the leading pipe.
In order to accommodate and support such buggy wikitext, the tokenizer
attempts to recognize "implicit" td-tags that follow a tr-tag.
However, the tokenizer doesn't have sufficient information to
always do this correctly and occasionally introduces an unnecessary
td-tag (which turns out to be empty).
We also handle this scenario in a DOM pass by recognizing empty
DOM elements that were auto-inserted by the tokenizer (or the
tree-builder when fixing mis-nested buggy wikitext -- more often
than you would think).
However, the dom pass that deleted empty DOM elements was run
too early (when the "empty" elements had marker meta tags used
for other DOM passes). So, it wouldn't get deleted and would
then introduce empty cells in output (examples + live diffs are
linked in the bug report). Simplified test case below:
{{Certification Table Top}}
|-
|foo||bar||baz
|}
* This patch moves the dom pass that deletes empty elements right
to the end before saving data-parsoid. This now fixes the bug,
the test snippet and the examples in the bug report.
* Currently WIP because we have a wt2wt failure introduced by the
reordering. The test case that fails is a contrived test case
where a newline is missing in wt2wt output. This also leads to
a bunch of selser failures (normal when wt2wt fails).
I have blacklisted these failures for now, but will investigate
more tomorrow.
Change-Id: Iaea6e144aae4d7461775b898968231c9e4cb7254
---
M js/lib/mediawiki.DOMPostProcessor.js
M js/tests/parserTests-blacklist.js
2 files changed, 28 insertions(+), 6 deletions(-)
git pull ssh://gerrit.wikimedia.org:29418/mediawiki/extensions/Parsoid
refs/changes/42/76842/1
diff --git a/js/lib/mediawiki.DOMPostProcessor.js
b/js/lib/mediawiki.DOMPostProcessor.js
index 5d1b005..925e6f6 100644
--- a/js/lib/mediawiki.DOMPostProcessor.js
+++ b/js/lib/mediawiki.DOMPostProcessor.js
@@ -1834,8 +1834,7 @@
// 1. Finds start-tag marker metas that dont have a corresponding start
tag
// and adds placeholder metas for the purposes of round-tripping.
// 2. Deletes any useless end-tag marker metas
- // 3. Deletes empty nodes that is entirely builder inserted (both
start/end)
- function findDeletedStartTagsAndDeleteEmptyTags(node) {
+ function findDeletedStartTags(node) {
// handle unmatched mw:StartTag meta tags
var c = node.firstChild;
while (c !== null) {
@@ -1863,10 +1862,8 @@
// other brittle DOM passes
working on the DOM.
deleteNode(c);
}
- } else if (c.childNodes.length === 0 &&
dp.autoInsertedStart && dp.autoInsertedEnd) {
- deleteNode(c);
} else {
-
findDeletedStartTagsAndDeleteEmptyTags(c);
+ findDeletedStartTags(c);
}
}
c = sibling;
@@ -1976,7 +1973,7 @@
}
findAutoInsertedTags(document.body);
- findDeletedStartTagsAndDeleteEmptyTags(document.body);
+ findDeletedStartTags(document.body);
}
/* ---------------------------------------------------------------------------
@@ -2936,6 +2933,18 @@
return true;
}
+function deleteEmptyAutoInsertedElts(node) {
+ var next = node.nextSibling;
+ if (DU.isElt(node) && node.childNodes.length === 0) {
+ var dp = node.data.parsoid;
+ if (dp && dp.autoInsertedStart && dp.autoInsertedEnd) {
+ deleteNode(node);
+ return next;
+ }
+ }
+ return true;
+}
+
/**
* @method
*
@@ -3033,6 +3042,7 @@
var domVisitor2 = new DOMTraverser();
domVisitor2.addHandler( 'meta', stripMarkerMetas.bind(null,
env.conf.parsoid.editMode) );
domVisitor2.addHandler( 'li', cleanUpLIHack.bind( null, env ) );
+ domVisitor2.addHandler( null, deleteEmptyAutoInsertedElts );
domVisitor2.addHandler( null, saveDataParsoid.bind(null, this.options)
);
this.processors.push(domVisitor2.traverse.bind(domVisitor2));
}
diff --git a/js/tests/parserTests-blacklist.js
b/js/tests/parserTests-blacklist.js
index 69e28e2..1ba9789 100644
--- a/js/tests/parserTests-blacklist.js
+++ b/js/tests/parserTests-blacklist.js
@@ -686,6 +686,7 @@
add("wt2wt", "RT-ed inter-element separators should be valid separators");
add("wt2wt", "Trailing newlines in a deep dom-subtree that ends a wikitext
line should be migrated out\n(Parsoid-only since PHP parser relies on Tidy for
correct output)");
add("wt2wt", "Empty TD followed by TD with tpl-generated attribute");
+add("wt2wt", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext)");
add("wt2wt", "Empty TR followed by mixed-ws-comment line should RT correctly");
add("wt2wt", "Improperly nested inline or quotes tags with whitespace in
between");
@@ -3947,6 +3948,17 @@
add("selser", "Empty TD followed by TD with tpl-generated attribute
[[4,[[0,0,4,0],0]]]");
add("selser", "Empty TD followed by TD with tpl-generated attribute [[4,1]]");
add("selser", "Indented table with an empty td [2,[3,[[0,0,0,2],4]]]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [[3,2]]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [[0,[2,3,0,0]]]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [[4,1]]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [[4,[0,4,0,0]]]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [2]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [[3,[0,2,0,0]]]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [[3,[0,0,0,3]]]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [[0,[0,0,0,2]]]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [1]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [[0,2]]");
+add("selser", "Empty TR followed by a template-generated TR\n(Parsoid-specific
since PHP parser doesn't handle this mixed tbl-wikitext) [[0,[0,0,0,4]]]");
add("selser", "Empty TR followed by mixed-ws-comment line should RT correctly
[2]");
add("selser", "Empty TR followed by mixed-ws-comment line should RT correctly
[[0,[2,2,2,0]]]");
add("selser", "Empty TR followed by mixed-ws-comment line should RT correctly
[[0,1]]");
--
To view, visit https://gerrit.wikimedia.org/r/76842
To unsubscribe, visit https://gerrit.wikimedia.org/r/settings
Gerrit-MessageType: newchange
Gerrit-Change-Id: Iaea6e144aae4d7461775b898968231c9e4cb7254
Gerrit-PatchSet: 1
Gerrit-Project: mediawiki/extensions/Parsoid
Gerrit-Branch: master
Gerrit-Owner: Subramanya Sastry <[email protected]>
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