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In a Magnolia CMS integration, I produced user tweets looking on some attributes (tag, Twitter search, Twitter user id..). For this, I used Twitter4J, a beautiful Java API to interact with Twitter.
Twitter production was really easy, 15 minutes of simple Java & Magnolia implementation.
The critical part was to parse every Tweet text in order to split ‘@’, ‘#’ and links, to make them clickable and CSSable.
For this, I used a Freemarker function, built for the occasion, and I want to share it here, for future purpose / users.
This is the function:
[#function parseTwitterText text] [#assign innerText = text] [#assign twitterUserRegexp = r'@(\w+)'] [#assign twitterUserReplaceStr = r'<a href="http://twitter.com/$1" target="_blank">@$1</a>' ] [#assign twitterHashRegexp = r'\s#(\w+)'] [#assign twitterStartingHashRegexp = r'^#(\w+)'] [#assign twitterHashReplaceStr = r' <a href="http://search.twitter.com/search?q=%23$1" target="_blank">#$1</a>'] [#assign twitterLinksRegexp = r'((http|https|ftp)?:\/\/([-\w\.]+)+(\/[\w\/\.*]*)?(\?\S+)?(\&\S+)?(\#\S+)?)'] [#assign twitterLinksReplaceStr = r'<a href="$1" target="_blank">$1</a>' ] [#if text?has_content] [#assign innerText = innerText?replace(twitterLinksRegexp, twitterLinksReplaceStr, 'r')] [#assign innerText = innerText?replace(twitterUserRegexp, twitterUserReplaceStr, 'r')] [#assign innerText = innerText?replace(twitterHashRegexp, twitterHashReplaceStr, 'r')] [#assign innerText = innerText?replace(twitterStartingHashRegexp, twitterHashReplaceStr, 'r')] [/#if] [#return innerText /] [/#function] |
Just few comments:
- Links must be replaced first: otherwise, @replacements or #replacements would be processed twice.
- Regexp must be written in a raw format (r’xyz’), to avoid Freemarker automatic escaping.
- I build regexp looking on some website example (1 :: 2)
- I wrote my code inspiring to Justin Shacklette article: Parsing Twitter with RegExp
This is a test FTL for testing this function:
[#assign testTexts = [
"this is a simple text",
"this is a simple text with @rule. and a point",
"this is a simple text with @rule and a word",
"this is a simple text with @rule",
"@rule this is a simple text with 2 @rules",
"this is a simple text with #rule. and a point",
"this is a simple text with #rule and a word",
"this is a simple text with #rule",
"#rule this is a simple text with 2 #rules",
"this is a simple text mixed rules #rule @rules",
"this contains a url: http://www.domain.com?test=true"
"this contains all items: http://www.domain.com, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://domain.com, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com/, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com/element, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com/element/, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com/element.html, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com/element.html?test=true, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com/element.html?test=true&test=false, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com/element.html?test=true&test=false#id, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com/element.html?test=true#id, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com/element.html#id, @rule and #rule, repeated: @rule and #rule",
"this contains all items: http://www.domain.com#id, @rule and #rule, repeated: @rule and #rule"]]
[#list testTexts as text]
<p>${text} :: ${parseTwitterText(text)}</p>
[/#list] |
In case you can not copy / paste this code, you can download the sample code here.
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