昨天上線新版本因?yàn)镺ther-Other賬號(hào)審核被拒了，估計(jì)要等待幾天了侈询，正好抽時(shí)間把最近寫的東西整理一下。

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言歸正傳，TXT電子書解析主要靠正則牡昆，篩選出文件內(nèi)所有章節(jié)，并劃分range摊欠，對(duì)于正則表達(dá)式的基礎(chǔ)內(nèi)容我不做過多描述丢烘，各位有興趣可以去 菜鳥教程正則表達(dá)式自己去看下一下。

正則

(\\s+?)([#☆些椒、【0-9]{0,10})(第[0-9零一二兩三四五六七八九十百千萬(wàn)壹貳叁肆伍陸柒捌玖拾佰仟\\s]{1,10}[章節(jié)回集卷])(.*)

用法

+ (void)parseLocalBookWithFilePath:(NSString *)filePath bookId:(NSString *)bookId success:(void (^)(NSArray<TJChapterModel *> * _Nonnull chapters))success failure:(TJFailureHandler)failure {
    if (!filePath) {
        !failure ?: failure([NSError errorWithDomain:NSCocoaErrorDomain code:-1 userInfo:@{NSUnderlyingErrorKey : @"文件路徑為空"}]);
        return;
    }
    
    if (![filePath hasSuffix:@"txt"]) {
        !failure ?: failure([NSError errorWithDomain:NSCocoaErrorDomain code:-1 userInfo:@{NSUnderlyingErrorKey : @"文件格式不正確"}]);
        return;
    }
    
    NSString *content = [self contentWithFilePath:filePath];
    if (TJIsEmptyObject(content)) {
        !failure ?: failure([NSError errorWithDomain:NSCocoaErrorDomain code:-1 userInfo:@{NSUnderlyingErrorKey : @"書籍內(nèi)容為空或者書籍格式錯(cuò)誤"}]);
        return;
    }
    NSRegularExpression *expression = [NSRegularExpression regularExpressionWithPattern:kParseLocalBookPattern options:NSRegularExpressionCaseInsensitive error:nil];
    NSArray *matches = [expression matchesInString:content options:NSMatchingReportCompletion range:NSMakeRange(0, content.length)];
    NSMutableArray *chapters = [[NSMutableArray alloc] init];
    if (matches.count == 0) {
        // 全書分為一章
        TJChapterModel *chapter = [[TJChapterModel alloc] init];
        chapter.chapterId = [bookId stringByAppendingFormat: @"1000000"];
        chapter.chapterIndex = 1;
        chapter.chapterName = @"開始";
        chapter.content = content;
        [chapters addObject:chapter];
    } else {
        // 當(dāng)前標(biāo)題在全文中的位置
        NSRange currentRange = NSMakeRange(0, 0);
        // 當(dāng)前章節(jié)編號(hào)
        NSInteger chapterIndex = 1;
        // 循環(huán)處理章節(jié)
        for (NSInteger i = 0; i < matches.count; i++) {
            @autoreleasepool {  // 自動(dòng)釋放池保證瞬時(shí)內(nèi)存不會(huì)過高
                NSTextCheckingResult *result = matches[i];
                // 下一個(gè)標(biāo)題在全文中的位置
                NSRange resultRange = result.range;
                // 截取兩個(gè)標(biāo)題之間內(nèi)容為當(dāng)前章節(jié)內(nèi)容
                NSString *chapterContent = [content substringWithRange:NSMakeRange(currentRange.location + currentRange.length, resultRange.location - currentRange.location - currentRange.length)];
                if (!TJIsEmptyObject(chapterContent) && resultRange.length <= 70) {
                    // 章節(jié)內(nèi)容不為空并且章節(jié)標(biāo)題長(zhǎng)度不超過70
                    TJChapterModel *chapterModel = [[TJChapterModel alloc] init];
                    chapterModel.chapterIndex = chapterIndex;
                    chapterModel.chapterId = [bookId stringByAppendingFormat: [NSString stringWithFormat:@"%@", @(1000000 + chapterIndex)]];
                    chapterModel.chapterName = (chapterIndex == 1) ? @"開始" : [[content substringWithRange:currentRange] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
                    chapterModel.content = [self resetContent:chapterContent];
                    [chapters addObject:chapterModel];
                    chapterIndex += 1;
                    currentRange = resultRange;
                }
            };
        }
        NSString *endChapterContent = [content substringWithRange:NSMakeRange(currentRange.location + currentRange.length, content.length - currentRange.location - currentRange.length)];
        if (!TJIsEmptyObject(endChapterContent)) {
            // 最后一章
            TJChapterModel *endChapterModel = [[TJChapterModel alloc] init];
            endChapterModel.chapterIndex = chapterIndex;
            endChapterModel.chapterId = [bookId stringByAppendingFormat: [NSString stringWithFormat:@"%@", @(1000000 + chapterIndex)]];
            endChapterModel.chapterName = [[content substringWithRange:currentRange] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
            endChapterModel.content = [self resetContent:endChapterContent];
            [chapters addObject:endChapterModel];
        }
    }
    if (chapters.count > 0 && success) {
        success(chapters);
    }
}

/// 處理章節(jié)內(nèi)容
/// @param content 內(nèi)容
+ (NSString *)resetContent:(NSString *)content {
    if (!content || content.length == 0) {
        return @"";
    }
    // 替換單換行
    content = [content stringByReplacingOccurrencesOfString:@"r" withString:@""];
    
    // 替換換行和多個(gè)換行（換行加空格）
    NSRegularExpression *regularExpression = [[NSRegularExpression alloc] initWithPattern:@"\\s*\\n+\\s*" options:NSRegularExpressionCaseInsensitive error:nil];
    content = [regularExpression stringByReplacingMatchesInString:content options:NSMatchingReportProgress range:NSMakeRange(0, content.length) withTemplate:@"\n　　"];
    
    // 去掉首尾空格和換行
    content = [content stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    
    // 章節(jié)開頭添加空格
    content = [@"　　" stringByAppendingString:content];
    
    return content;
}