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Fix the lede extractor for edge cases

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This commit is contained in:
Angelo Stavrow 2020-11-09 14:56:03 -05:00
parent cd6f8adbbb
commit c32c67040f
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1 changed files with 17 additions and 14 deletions
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31
Shared/PostList/PostListModel.swift
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@ -96,26 +96,29 @@ private extension PostListModel {
}
func extractLede(from string: String) -> String {
if string.isEmpty { return string }
let truncatedString = string.prefix(80)
let terminatingCharacters = CharacterSet(charactersIn: ".。?").union(.newlines)
let terminatingPunctuation = ".。?"
let terminatingCharacters = CharacterSet(charactersIn: terminatingPunctuation).union(.newlines)
var lede: String
// Extract the first sentence from the lede.
var lede: String = ""
let sentences = truncatedString.components(separatedBy: terminatingCharacters)
let firstSentence = sentences.filter { !$0.isEmpty }[0]
if firstSentence == truncatedString && string.utf16.count > 80 {
let endOfStringIndex = truncatedString.lastIndex(of: " ")
lede = String(
truncatedString[..<(endOfStringIndex ?? truncatedString.index(truncatedString.endIndex, offsetBy: -2))]
) + "…"
} else {
lede = String(truncatedString[..<firstSentence.endIndex])
if truncatedString.count > firstSentence.count {
if terminatingPunctuation.contains(truncatedString[firstSentence.endIndex]) {
lede = String(truncatedString[...firstSentence.endIndex])
} else {
lede = firstSentence
}
} else if truncatedString.count == firstSentence.count {
if string.count > 80 {
if let endOfStringIndex = truncatedString.lastIndex(of: " ") {
lede = truncatedString[..<endOfStringIndex] + "…"
}
} else {
lede = firstSentence
}
}
return lede
}
}