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From "Volker Mische (JIRA)" <>
Subject [jira] Updated: (COUCHDB-1006) Ability to replace substrings in rewriter
Date Mon, 03 Jan 2011 11:18:45 GMT


Volker Mische updated COUCHDB-1006:

    Attachment: rewrite-replace.patch

Allow replacement of substrings.

> Ability to replace substrings in rewriter
> -----------------------------------------
>                 Key: COUCHDB-1006
>                 URL:
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Database Core
>            Reporter: Volker Mische
>            Priority: Minor
>         Attachments: rewrite-replace.patch
> The current rewriter is bound to the parts of a path. Therefore I propose and additional
"replace" property to be able to rewrite URLs beyond that limitation. One example would be
subpages in a wiki, where each subpage corresponds to one document in the database. Here's
an example:
> Desired URL:
> URL without rewriting:
> Another use case is when you have to deal with attachments. For example if you want to
build a TMS tilecache [1] bases on CouchDB. My URL would look like this (where "tile" is the
> But I'd need an URL like
> (resp.
> My modification to the rewriter allows you to replace substrings with other ones. Here's
the rewriter rule for this example:
> {
>     "from" : "/tiles/<x>/<y>/<z>.png",
>     "to" : "..\\/..\\/:x/:y/:z/tile",
>     "replace": {
>         "old": "/",
>         "new": "-",
>         "limit": -1
>     }
> }
> It replaces all occurences of "/" with "-" on the "to"-path. Two slashes ("\\") escape
a character, so it won't be replaced. The "limit" parameter specifies how many occurences
should be replaced. It could be either positive, then it will just count how often a string
was already replaced and stop at the limit. If "limit" is negative, it will count from the
back. This is especially useful if you want to replace slashes and know how many slashes the
attachment has, but not how many the document has.

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