Adding a trust value to Doku Wiki

Hello, I Have installed DokuWiki in my website, its just like mediawiki, a wiki software. In it I need a trust value factor to be installed. Here is what it means : *each article's page should have an accompanying trust [login to view URL] trust value is calculated as follows: {(t*|V1| + a*|I| - min((1-a)|D|,t*v1) - max(a*|D| - (1-t)*|V1|,0)}/|v2|, where t= original trust value of article |v1| = size of the articles(in number of characters) a = trust value of author i.e user who is editing the article(trust values for different users are Administrator=0.95,editors=.7,anynomous users=0.6,blocked users=.05) |I|=amount of insertion the person who is editing has made,in number of characters |D|=amount of deletion the person who has edited the article has made,in number of characters |v2|=|v1| +|I| - |D| as an example,suppose there is an article with a trust value of [login to view URL] size of the article is 56 [login to view URL] editor comes and edits this article making an insertion of 8 characters,i.e|I|=8 and a deletion of 14 characters,i.e |D|=[login to view URL] the above formula the trust value changes to 0.92 Obviously,whenever any user creates an article the trust value of the article is the same as that of the user that created it,as per the formula.