76 lines
2.4 KiB
Swift
76 lines
2.4 KiB
Swift
import Foundation
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/// 对标 WXRead `WREpubPositionConverter` 的全书位置转换器。
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///
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/// 负责在四套坐标之间做双向转换：
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/// - `(fileIndex, row, column)` 文件级语义锚点
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/// - 章节内字符偏移
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/// - 全书字符偏移
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/// - 页码 / `RDEPUBLocation`
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public struct RDEPUBTextPositionConverter {
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public let book: RDEPUBTextBook
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public init(book: RDEPUBTextBook) {
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self.book = book
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}
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public var totalCharacterCount: Int {
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book.indexTable.totalCharacterCount
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}
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public func globalIndex(for anchor: RDEPUBTextAnchor) -> Int {
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book.indexTable.globalIndex(for: anchor)
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}
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public func globalRange(for rangeAnchor: RDEPUBTextRangeAnchor) -> NSRange {
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book.indexTable.globalRange(for: rangeAnchor)
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}
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public func fileIndex(forCharacterPosition index: Int) -> Int? {
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book.indexTable.fileIndex(forCharacterPosition: index)
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}
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public func localOffsetInFile(at fileIndex: Int, forGlobalPosition index: Int) -> Int? {
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book.indexTable.localOffsetInFile(at: fileIndex, forGlobalPosition: index)
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}
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public func anchor(forCharacterPosition index: Int) -> RDEPUBTextAnchor? {
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book.indexTable.anchor(forGlobalIndex: index)
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}
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public func anchor(for location: RDEPUBLocation) -> RDEPUBTextAnchor? {
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book.indexTable.anchor(for: location)
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}
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public func pageNumber(for anchor: RDEPUBTextAnchor) -> Int? {
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book.indexTable.pageNumber(for: anchor, in: book).map { $0 + 1 }
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}
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public func pageNumber(forCharacterPosition index: Int) -> Int? {
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guard let anchor = anchor(forCharacterPosition: index) else {
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return nil
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}
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return pageNumber(for: anchor)
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}
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public func location(
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for anchor: RDEPUBTextAnchor,
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bookIdentifier: String?
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) -> RDEPUBLocation? {
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guard let chapter = book.chapters.first(where: { $0.spineIndex == anchor.fileIndex }) else {
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return nil
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}
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return book.indexTable.location(for: anchor, in: chapter, bookIdentifier: bookIdentifier)
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}
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public func location(
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for rangeAnchor: RDEPUBTextRangeAnchor,
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bookIdentifier: String?
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) -> RDEPUBLocation? {
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guard let chapter = book.chapters.first(where: { $0.spineIndex == rangeAnchor.start.fileIndex }) else {
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return nil
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}
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return book.indexTable.location(for: rangeAnchor, in: chapter, bookIdentifier: bookIdentifier)
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}
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}
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