64 lines
2.2 KiB
C++
64 lines
2.2 KiB
C++
#pragma once
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#include <Epub.h>
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#include <memory>
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#include <string>
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/**
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* Lightweight XPath/progress bridge for KOReader sync.
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*
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* Why this exists:
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* - CrossPoint stores reading position as chapter/page.
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* - KOReader sync uses XPath + percentage.
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*
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* This utility reparses exactly one spine XHTML item with Expat and builds
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* transient text anchors (<xpath, textOffset>) so we can translate in both
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* directions without keeping a full DOM in memory.
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*
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* Design constraints (ESP32-C3):
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* - No persistent full-book structures.
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* - Parse-on-demand and free memory immediately.
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* - Keep fallback behavior deterministic if parsing/matching fails.
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*/
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class ChapterXPathIndexer {
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public:
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/**
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* Convert an intra-spine progress ratio to the nearest element-level XPath.
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*
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* @param epub Loaded EPUB instance
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* @param spineIndex Current spine item index
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* @param intraSpineProgress Position within the spine item [0.0, 1.0]
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* @return Best matching XPath for KOReader, or empty string on failure
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*/
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static std::string findXPathForProgress(const std::shared_ptr<Epub>& epub, int spineIndex, float intraSpineProgress);
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/**
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* Resolve a KOReader XPath to an intra-spine progress ratio.
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*
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* Matching strategy:
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* 1) exact anchor path match,
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* 2) index-insensitive path match,
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* 3) ancestor fallback.
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*
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* @param epub Loaded EPUB instance
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* @param spineIndex Spine item index to parse
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* @param xpath Incoming KOReader XPath
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* @param outIntraSpineProgress Resolved position within spine [0.0, 1.0]
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* @param outExactMatch True only for full exact path match
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* @return true if any match was resolved; false means caller should fallback
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*/
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static bool findProgressForXPath(const std::shared_ptr<Epub>& epub, int spineIndex, const std::string& xpath,
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float& outIntraSpineProgress, bool& outExactMatch);
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/**
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* Parse DocFragment index from KOReader-style path segment:
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* /body/DocFragment[N]/body/...
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*
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* @param xpath KOReader XPath
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* @param outSpineIndex Parsed DocFragment index (0-based)
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* @return true when DocFragment[N] exists and N is valid integer >= 0
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*/
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static bool tryExtractSpineIndexFromXPath(const std::string& xpath, int& outSpineIndex);
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};
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