5

HTMLテキストをNSStringに解析するオープンソースの方法を使用しています。

結果の文字列には、最初の 2 つの段落の間に大量の空白がありますが、後続の段落には 1 行の空白しかありません。出力例を次に示します。

ここに画像の説明を入力 以下は、私が呼び出しているメソッドです。コードの 2 行だけを変更しました。stopCharactersとについては、文字セットを含めたときにテキスト全体が 1 つの長い段落になったため、文字セットからnewLineAndWhitespaceCharacters削除しました。/n

- (NSString *)stringByConvertingHTMLToPlainText {

    // Pool
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    // Character sets
    NSCharacterSet *stopCharacters = [NSCharacterSet characterSetWithCharactersInString:[NSString stringWithFormat:@"< \t\r%C%C%C%C", 0x0085, 0x000C, 0x2028, 0x2029]];
    NSCharacterSet *newLineAndWhitespaceCharacters = [NSCharacterSet characterSetWithCharactersInString:[NSString stringWithFormat:@" \t\r%C%C%C%C", 0x0085, 0x000C, 0x2028, 0x2029]];
    NSCharacterSet *tagNameCharacters = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"];

    // Scan and find all tags
    NSMutableString *result = [[NSMutableString alloc] initWithCapacity:self.length];
    NSScanner *scanner = [[NSScanner alloc] initWithString:self];
    [scanner setCharactersToBeSkipped:nil];
    [scanner setCaseSensitive:YES];
    NSString *str = nil, *tagName = nil;
    BOOL dontReplaceTagWithSpace = NO;
    do {

        // Scan up to the start of a tag or whitespace
        if ([scanner scanUpToCharactersFromSet:stopCharacters intoString:&str]) {
            [result appendString:str];
            str = nil; // reset
        }

        // Check if we've stopped at a tag/comment or whitespace
        if ([scanner scanString:@"<" intoString:NULL]) {

            // Stopped at a comment or tag
            if ([scanner scanString:@"!--" intoString:NULL]) {

                // Comment
                [scanner scanUpToString:@"-->" intoString:NULL];
                [scanner scanString:@"-->" intoString:NULL];

            } else {

                // Tag - remove and replace with space unless it's
                // a closing inline tag then dont replace with a space
                if ([scanner scanString:@"/" intoString:NULL]) {

                    // Closing tag - replace with space unless it's inline
                    tagName = nil; dontReplaceTagWithSpace = NO;
                    if ([scanner scanCharactersFromSet:tagNameCharacters intoString:&tagName]) {
                        tagName = [tagName lowercaseString];
                        dontReplaceTagWithSpace = ([tagName isEqualToString:@"a"] ||
                                                   [tagName isEqualToString:@"b"] ||
                                                   [tagName isEqualToString:@"i"] ||
                                                   [tagName isEqualToString:@"q"] ||
                                                   [tagName isEqualToString:@"span"] ||
                                                   [tagName isEqualToString:@"em"] ||
                                                   [tagName isEqualToString:@"strong"] ||
                                                   [tagName isEqualToString:@"cite"] ||
                                                   [tagName isEqualToString:@"abbr"] ||
                                                   [tagName isEqualToString:@"acronym"] ||
                                                   [tagName isEqualToString:@"label"]);
                    }

                    // Replace tag with string unless it was an inline
                    if (!dontReplaceTagWithSpace && result.length > 0 && ![scanner isAtEnd]) [result appendString:@" "];

                }

                // Scan past tag
                [scanner scanUpToString:@">" intoString:NULL];
                [scanner scanString:@">" intoString:NULL];

            }

        } else {

            // Stopped at whitespace - replace all whitespace and newlines with a space
            if ([scanner scanCharactersFromSet:newLineAndWhitespaceCharacters intoString:NULL]) {
                if (result.length > 0 && ![scanner isAtEnd]) [result appendString:@" "]; // Dont append space to beginning or end of result
            }

        }

    } while (![scanner isAtEnd]);

    // Cleanup
    [scanner release];

    // Decode HTML entities and return
    NSString *retString = [[result stringByDecodingHTMLEntities] retain];
    [result release];

    // Drain
    [pool drain];

    // Return
    return [retString autorelease];

}

編集：

文字列の NSLog は次のとおりです。最初の数段落だけ貼り付けました

Mitt Romney spent the past six years running for president. After his loss to President Barack Obama, he'll have to chart a different course.  


 His initial plan: spend time with his family. He has five sons and 18 grandchildren, with a 19th on the way.  






 "I don't look at postelection to be a time of regrouping. Instead it's a time of forward focus," Romney told reporters aboard his plane Tuesday evening as he returned to Boston after the final campaign stop of his political career. "I have, of course, a family and life important to me, win or lose."  

 The most visible member of that family — wife Ann Romney — says neither she nor her husband will seek political office again.

等....

for (int j = 25; j< 50; j++) {
    char test =  [completeTrimmed characterAtIndex:([completeTrimmed rangeOfString:@"chart a different course."].location + j)];

        NSLog(@"%hhd", test);
    }

012-11-11 17:15:57.668 LMU_LAL_LAUNCHER[5431:c07] 32
2012-11-11 17:15:57.669 LMU_LAL_LAUNCHER[5431:c07] 32
2012-11-11 17:15:57.669 LMU_LAL_LAUNCHER[5431:c07] 10
2012-11-11 17:15:57.670 LMU_LAL_LAUNCHER[5431:c07] 32
2012-11-11 17:15:57.670 LMU_LAL_LAUNCHER[5431:c07] 32
2012-11-11 17:15:57.670 LMU_LAL_LAUNCHER[5431:c07] 10
2012-11-11 17:15:57.671 LMU_LAL_LAUNCHER[5431:c07] 32
2012-11-11 17:15:57.671 LMU_LAL_LAUNCHER[5431:c07] 32
2012-11-11 17:15:57.671 LMU_LAL_LAUNCHER[5431:c07] 10
2012-11-11 17:15:57.672 LMU_LAL_LAUNCHER[5431:c07] 32
2012-11-11 17:15:57.672 LMU_LAL_LAUNCHER[5431:c07] 72
2012-11-11 17:15:57.672 LMU_LAL_LAUNCHER[5431:c07] 105
2012-11-11 17:15:57.673 LMU_LAL_LAUNCHER[5431:c07] 115
2012-11-11 17:15:57.673 LMU_LAL_LAUNCHER[5431:c07] 32
2012-11-11 17:15:57.673 LMU_LAL_LAUNCHER[5431:c07] 105
2012-11-11 17:15:57.673 LMU_LAL_LAUNCHER[5431:c07] 110
2012-11-11 17:15:57.674 LMU_LAL_LAUNCHER[5431:c07] 105
2012-11-11 17:15:57.674 LMU_LAL_LAUNCHER[5431:c07] 116
2012-11-11 17:15:57.674 LMU_LAL_LAUNCHER[5431:c07] 105
2012-11-11 17:15:57.675 LMU_LAL_LAUNCHER[5431:c07] 97
2012-11-11 17:15:57.675 LMU_LAL_LAUNCHER[5431:c07] 108
2012-11-11 17:15:57.675 LMU_LAL_LAUNCHER[5431:c07] 32
2012-11-11 17:15:57.675 LMU_LAL_LAUNCHER[5431:c07] 112
2012-11-11 17:15:57.676 LMU_LAL_LAUNCHER[5431:c07] 108
2012-11-11 17:15:57.676 LMU_LAL_LAUNCHER[5431:c07] 97
4

3 に答える 3

4

これで確認して、

  //Decode HTML entities and return
  NSString *retString = [result stringByDecodingHTMLEntities];
  [result release];

  //Drain
  [pool drain];

  retString = [[retString stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] retain];

  //Return
  return [retString autorelease];   
}

上記が機能しない場合は、こちらも試してください

completeTrimmed = [completeTrimmed stringByReplacingOccurrencesOfString:@"\n" withString:@""];

と

completeTrimmed = [completeTrimmed stringByReplacingOccurrencesOfString:@"\r" withString:@""];
于 2012-11-11T04:29:00.350 に答える
2

@"/n/n" を @"/n" に置き換えて、改行の数を減らすことができます。

于 2012-11-18T23:05:26.827 に答える
1

私は上記の質問を試しましたが、これが私がそれを修正した方法です、

NSString *retString = [[result stringByDecodingHTMLEntities] retain];
[result release];

retString = [retString stripDuplicateCharactersInSet:[NSCharacterSet whitespaceCharacterSet] withString:@" "];
retString = [retString stripDuplicateCharactersInSet:[NSCharacterSet newlineCharacterSet] withString:@"\n"];

NSStringのカテゴリメソッドを次のように定義しました。

- (NSString *)stripDuplicateCharactersInSet:(NSCharacterSet *)characterSet withString:(NSString *)joiningString;

実装は次のとおりです。

- (NSString *)stripDuplicateCharactersInSet:(NSCharacterSet *)characterSet withString:(NSString *)joiningString {

    NSMutableString *originalStr = [NSMutableString string];

    if (!self) {
        return nil;
    }

    NSArray *componentsArray = [self componentsSeparatedByCharactersInSet:characterSet];

    int counter = 0;
    for (NSString *stringComponent in componentsArray) {

        counter ++;

        if ((stringComponent) && ([stringComponent length] > 0) && (![stringComponent isEqualToString:@" "]) && ((![stringComponent isEqualToString:@"\n"]) || (![joiningString isEqualToString:@"\n"]))) {

            if ([componentsArray count] == counter) {
                [originalStr appendFormat:@"%@", stringComponent];                
            } else {
                [originalStr appendFormat:@"%@%@", stringComponent, joiningString];
            }
        }
    }

    return originalStr;
}

NSString+HTML.m上記のメソッドをのカテゴリとしてファイルに追加しますNSString。基本的に、あなたが提供したhtmlでは、空白と改行が何度も混在していて、改行だけを削除しようとしても機能しませんでした。そのため、上記のように重複する改行と空白を削除します。これは、文字列を削除してからメイン文字列に追加した後、文字列に改行または空白があるかどうかを比較することによって行います。

または、次のように試すこともできます。

NSString *retString = [[result stringByDecodingHTMLEntities] retain];
[result release];

retString = [retString stripDuplicateNewlineCharacters];

メソッドは次のように定義されます。

- (NSString *)stripDuplicateNewlineCharacters {

    NSMutableString *originalStr = [NSMutableString string];

    if (!self) {
        return nil;
    }

    NSArray *componentsArray = [self componentsSeparatedByCharactersInSet:[NSCharacterSet newlineCharacterSet]];

    int counter = 0;
    for (NSString *stringComponent in componentsArray) {

        counter ++;

        stringComponent = [stringComponent stringByReplacingOccurrencesOfString:@" " withString:@"<#$%$#>"];
        stringComponent = [stringComponent stringByReplacingOccurrencesOfString:@"<#$%$#><#$%$#>" withString:@"<#$%$#>"];
        stringComponent = [stringComponent stringByReplacingOccurrencesOfString:@"<#$%$#>" withString:@" "];

        if ((stringComponent) && ([stringComponent length] > 0) && (![stringComponent isEqualToString:@" "]) && (![stringComponent isEqualToString:@"\n"])) {

            if ([componentsArray count] == counter) {
                [originalStr appendFormat:@"%@", stringComponent];
            } else {
                [originalStr appendFormat:@"%@\n", stringComponent];
            }
        }
    }

    return originalStr;
}

この場合、改行文字を削除するときに、メソッド自体で重複する空白が削除されます。

于 2012-11-20T02:34:58.883 に答える