When a Kobo device pushes a last-read-place bookmark, the server now
converts the KEPUB CFI (with koboSpan wrappers) to a standard EPUB CFI
and extracts surrounding text as context_text for use by other devices
(KOReader, web reader) during their pull-side CFI conversions.
Previously the raw KEPUB CFI was stored verbatim as epubcfi, which
meant foliate and CREngine couldn't resolve it (wrong child indices
due to koboSpan wrappers), and no context_text was available for the
text-search fallback in ConvertStandardToCRE.
Changes:
- kepub_cfi_converter.go: Add ExtractedContext field to
KEPUBConversionResult, populated from the already-computed
searchText in both ConvertKEPUBCFIToStandard and
ConvertStandardCFIToKEPUB (exact-match and percentage-fallback
paths).
- kobo.go: Add libraryService field and SetLibraryService setter
(mirrors KOReaderHandler pattern). Add convertKoboCFIToStandard
helper that resolves EPUB+KEPUB paths, instantiates the converter,
and returns the converted CFI + extracted context. The last-read-place
branch in Markup now calls this helper for reflowable formats,
skipping fixed-layout/comic archives (page-index only).
- router.go: Add LibraryService to router Config.
- sync.go: Wire LibraryService to KoboHandler via SetLibraryService.
- main.go: Pass libraryService through router config.
The conversion is purely additive — if no KEPUB file exists on disk
(e.g. side-loaded EPUB without kepubify conversion), the handler
gracefully skips conversion and stores the raw CFI as before.
Instead of reading only from the single resolved text node (which
produces a tiny window when the position is inside <em> or other inline
elements), extractSurroundingText now:
1. Finds the block-level parent (e.g. <p>) of the resolved text node
2. Collects all text within that block, transparently crossing inline
formatting elements via collectInlineText
3. Computes the global offset of the original text node within the
concatenated block text
4. Extracts the [offset-window : offset+window] slice
This gives a full context window regardless of inline element
boundaries, enabling accurate text bridging between EPUB and KEPUB
documents even when reading positions fall inside <em>, <strong>,
<span class="koboSpan">, etc.
Falls back to single-node extraction when no block parent is found
(e.g. orphan text nodes in tests).
Add KEPUBCFIConverter in internal/sync that converts between KEPUB CFIs
(which include extra koboSpan DOM steps) and standard EPUB CFIs at sync
time, so only standard epubcfi values are stored in the database.
The converter works by:
1. Resolving the source CFI in the source document (EPUB or KEPUB)
2. Extracting surrounding text at the resolved position
3. Searching for that same text in the target document
4. Building a new CFI pointing to the matched text in the target
This text-content bridging handles the DOM structural differences
between EPUB (text nodes at depth 2) and KEPUB (text nodes wrapped in
<span class="koboSpan"> at depth 3).
Falls back to percentage-based positioning when text search fails,
matching the pattern used by the existing CRE converter.
No changes to existing cfi_converter.go or KOReader conversion code.
Same-package access to unexported functions (resolveCFIToNode, buildCFI,
findTextInNode, etc.) via internal/sync package placement.
john-okeefe