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From "Henri Yandell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LANG-426) String splitting with escaped delimiter
Date Sun, 11 May 2008 05:27:55 GMT

    [ https://issues.apache.org/jira/browse/LANG-426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12595882#action_12595882
] 

Henri Yandell commented on LANG-426:
------------------------------------

Need to write a unit test.

> String splitting with escaped delimiter
> ---------------------------------------
>
>                 Key: LANG-426
>                 URL: https://issues.apache.org/jira/browse/LANG-426
>             Project: Commons Lang
>          Issue Type: New Feature
>    Affects Versions: 2.4
>            Reporter: Emmanuel Bourg
>            Priority: Minor
>             Fix For: 3.0
>
>
> In Commons Configuration we use a custom split method that supports the concept of an
escaped delimiter, that may be nice if this was available in Commons Lang (as a method in
StringUtils, or as a setting in StrTokenizer).
> Example:
> {code}
> a,b\,c,d    ->    ["a", "b,c", "d"]
> {code}
> Here is the code of the method:
> {code:java}
> public static List<String> split(String s, char delimiter)
> {
>     if (s == null)
>     {
>         return new ArrayList<String>();
>     }
>     List<String> list = new ArrayList<String>();
>     StringBuilder token = new StringBuilder();
>     int begin = 0;
>     boolean inEscape = false;
>     while (begin < s.length())
>     {
>         char c = s.charAt(begin);
>         if (inEscape)
>         {
>             // last character was the escape marker
>             // can current character be escaped?
>             if (c != delimiter && c != LIST_ESC_CHAR)
>             {
>                 // no, also add escape character
>                 token.append(LIST_ESC_CHAR);
>             }
>             token.append(c);
>             inEscape = false;
>         }
>         else
>         {
>             if (c == delimiter)
>             {
>                 // found a list delimiter -> add token and reset buffer
>                 list.add(token.toString().trim());
>                 token = new StringBuilder();
>             }
>             else if (c == LIST_ESC_CHAR)
>             {
>                 // eventually escape next character
>                 inEscape = true;
>             }
>             else
>             {
>                 token.append(c);
>             }
>         }
>         begin++;
>     }
>     // Trailing delimiter?
>     if (inEscape)
>     {
>         token.append(LIST_ESC_CHAR);
>     }
>     // Add last token
>     list.add(token.toString().trim());
>     return list;
> }
> {code}

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