如何解析一些Wiki标记 [英] How to Parse Some Wiki Markup
问题描述
嘿，给定一个以纯文本形式显示的数据集，如下所示:
Hey guys, given a data set in plain text such as the following:
==Events==
* [[312]] – [[Constantine the Great]] is said to have received his famous [[Battle of Milvian Bridge#Vision of Constantine|Vision of the Cross]].
* [[710]] – [[Saracen]] invasion of [[Sardinia]].
* [[939]] – [[Edmund I of England|Edmund I]] succeeds [[Athelstan of England|Athelstan]] as [[King of England]].
*[[1275]] – Traditional founding of the city of [[Amsterdam]].
*[[1524]] – [[Italian Wars]]: The French troops lay siege to [[Pavia]].
*[[1553]] – Condemned as a [[Heresy|heretic]], [[Michael Servetus]] is [[burned at the stake]] just outside [[Geneva]].
*[[1644]] – [[Second Battle of Newbury]] in the [[English Civil War]].
*[[1682]] – [[Philadelphia]], [[Pennsylvania]] is founded.
我想以NSDictionary或其他形式的结尾，这样我就可以将年份(左侧的数字)映射到摘录(右侧的文本).这就是模板"的样子:
I would like to end up with an NSDictionary or other form of collection so that I can have the year (The Number on the left) mapping to the excerpt (The text on the right). So this is what the 'template' is like:
*[[YEAR]] – THE_TEXT
尽管我希望摘录是纯文本，也就是说，没有Wiki标记，所以没有设置[[.实际上，使用[[Edmund I of England|Edmund I]]之类的别名链接可能很难证明这一点.
Though I would like the excerpt to be plain text, that is, no wiki markup so no [[ sets. Actually, this could prove difficult with alias links such as [[Edmund I of England|Edmund I]].
我对正则表达式不是很了解，所以我有几个问题.我应该首先尝试美化"数据吗?例如，要删除始终为==Events==的第一行，并删除[[和]]出现的内容?
I am not all that experienced with regular expressions so I have a few questions. Should I first try to 'beautify' the data? For example, removing the first line which will always be ==Events==, and removing the [[ and ]] occurrences?
也许是一个更好的解决方案:我应该分阶段进行吗?因此，例如，第一遍，我可以将每行分成* [[710]]和[[Saracen]] invasion of [[Sardinia]].并将它们存储在不同的NSArrays中.
Or perhaps a better solution: Should I do this in passes? So for example, the first pass I can separate each line into * [[710]] and [[Saracen]] invasion of [[Sardinia]]. and store them into different NSArrays.
然后经历年份的头一个NSArray，仅在[[]]之内得到文本(我说的是文本，而不是数字，因为它可能是公元前530 )，因此* [[710]]变为710.
Then go through the first NSArray of years and only get the text within the [[]] (I say text and not number because it can be 530 BC), so * [[710]] becomes 710.
然后对于摘录的NSArray进行检查，如果找到了[[some_article|alias]]，则以某种方式使其仅成为[[alias]]，然后删除所有的[[和]]集?
And then for the excerpt NSArray, go through and if an [[some_article|alias]] is found, make it only be [[alias]] somehow, and then remove all of the [[ and ]] sets?
这可能吗?我应该使用正则表达式吗?对于正则表达式，您能提出什么建议吗?
Is this possible? Should I use regular expressions? Are there any ideas you can come up with for regular expressions that might help?
谢谢！我真的很感激.
编辑:很抱歉造成混乱，但是我只想解析以上数据.假设那是我将遇到的唯一标记类型.我不一定总希望解析Wiki标记，除非已经有一个预先存在的库可以做到这一点.再次感谢！
EDIT: Sorry for the confusion, but I only want to parse the above data. Assume that that's the only type of markup that I will encounter. I'm not necessarily looking forward to parsing wiki markup in general, unless there is already a pre-existing library which does this. Thanks again!
推荐答案
此代码假定您使用的是 RegexKitLite :
This code assumes you are using RegexKitLite:
NSString *data = @"* [[312]] – [[Constantine the Great]] is said to have received his famous [[Battle of Milvian Bridge#Vision of Constantine|Vision of the Cross]].\n\
* [[710]] – [[Saracen]] invasion of [[Sardinia]].\n\
* [[939]] – [[Edmund I of England|Edmund I]] succeeds [[Athelstan of England|Athelstan]] as [[King of England]].\n\
*[[1275]] – Traditional founding of the city of [[Amsterdam]].";
NSString *captureRegex = @"(?i)(?:\\* *\\[\\[)([0-9]*)(?:\\]\\] \\– )(.*)";
NSRange captureRange;
NSRange stringRange;
stringRange.location = 0;
stringRange.length = data.length;
do
{
captureRange = [data rangeOfRegex:captureRegex inRange:stringRange];
if ( captureRange.location != NSNotFound )
{
NSString *year = [data stringByMatching:captureRegex options:RKLNoOptions inRange:stringRange capture:1 error:NULL];
NSString *textStuff = [data stringByMatching:captureRegex options:RKLNoOptions inRange:stringRange capture:2 error:NULL];
stringRange.location = captureRange.location + captureRange.length;
stringRange.length = data.length - stringRange.location;
NSLog(@"Year:%@, Stuff:%@", year, textStuff);
}
}
while ( captureRange.location != NSNotFound );
请注意，您确实需要研究RegEx才能很好地构建它们，但这就是我所说的:
Note that you really need to study up on RegEx's to build these well, but here's what the one I have is saying:
(?i)
忽略大小写，因为我不匹配字母，所以我可以忽略掉它.
Ignore case, I could have left that out since I'm not matching letters.
(?:\* *\[\[)
?:表示不捕获此块，我将*进行匹配以将其转义，然后有零个或多个空格("*")，然后我将两个方括号转义(因为方括号也是正则表达式中的特殊字符).
?: means don't capture this block, I escape * to match it, then there are zero or more spaces (" *") then I escape out two brackets (since brackets are also special characters in a regex).
([0-9]*)
抓住任何数字.
(?:\]\] \– )
这里是我们再次忽略内容的地方，基本上与–"匹配.注意正则表达式中的任何"\"，我必须在上面的Objective-C字符串中添加另一个，因为"\"是字符串中的特殊字符...是的，这意味着匹配正则表达式转义的单个"\"结尾在Obj-C字符串中显示为"\\".
Here's where we ignore stuff again, basically matching " – ". Note any "\" in the regex, I have to add another one to in the Objective-C string above since "\" is a special character in a string... and yes that means matching a regex escaped single "\" ends up as "\\" in an Obj-C string.
(.*)
只需抓取其他任何东西，默认情况下，RegEX引擎都会在一行的末尾停止匹配，这就是为什么它不仅仅匹配其他所有内容的原因.您必须添加代码才能从文本中删除[[LINK]]内容.
Just grab anything else, by default the RegEX engine will stop matching at the end of a line which is why it doesn't just match everything else. You'll have to add code to strip out the [[LINK]] stuff from the text.
NSRange变量用于在整个文件中保持匹配，而无需重新匹配原始匹配.可以这么说.
The NSRange variables are used to keep matching through the file without re-matching original matches. So to speak.
添加RegExKitLite类文件后不要忘记，还需要添加特殊的链接器标志，否则会出现很多链接错误(RegexKitLite网站上有安装说明).
Don't forget after you add the RegExKitLite class files, you also need to add the special linker flag or you'll get lots of link errors (the RegexKitLite site has installation instructions).
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