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https://issues.apache.org/jira/browse/COUCHDB-1006?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Volker Mische updated COUCHDB-1006:
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Attachment: rewrite-replace.patch
Allow replacement of substrings.
> Ability to replace substrings in rewriter
> -----------------------------------------
>
> Key: COUCHDB-1006
> URL: https://issues.apache.org/jira/browse/COUCHDB-1006
> 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:
> http://example.com/wiki/apache-projects/couchdb/info
> URL without rewriting:
> http://example.com/wiki/apache-projects%2fcouchd%2f/info
> 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 attachement):
> http://example.com/tilecache/3-5-2/tile
> But I'd need an URL like
> http://example.com/tilecache/tiles/3/5/2.png
> (resp.
> http://example.com/tilecache/_design/tilecache/_rewrite/tiles/6/9/9.png)
> 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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