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Add paragraph index LUT for accurate KOReader position sync

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Store per-page paragraph indices in section cache to enable precise
XPath-to-page and page-to-XPath mapping without reparsing XHTML.

Forward path (upload): generates XPath directly from paragraph LUT
instead of byte-offset estimation, eliminating drift in chapters
with non-uniform content density.

Reverse path (download): resolves incoming KOReader XPath p[N] to
the exact page via paragraph LUT lookup.

Paragraph counter counts all <p> elements including display:none
to match ChapterXPathIndexer and crengine's standard XPath counting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
jpirnay
2026-03-22 12:29:30 +01:00
co-authored by Claude Opus 4.6
parent 5b710e960f
commit fd70b3a231
17 changed files with 354 additions and 43 deletions
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lib/I18n/translations/english.yaml
+2
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@@ -264,6 +264,8 @@ STR_SYNCING_TIME: "Syncing time..."
STR_CALC_HASH: "Calculating document hash..."
STR_HASH_FAILED: "Failed to calculate document hash"
STR_FETCH_PROGRESS: "Fetching remote progress..."
STR_MAPPING_REMOTE: "Mapping remote position..."
STR_MAPPING_LOCAL: "Calculating local position..."
STR_UPLOAD_PROGRESS: "Uploading progress..."
STR_NO_CREDENTIALS_MSG: "No credentials configured"
STR_KOREADER_SETUP_HINT: "Set up KOReader account in Settings"