issuefunction in linkedIssuesOfAll("sub,[link description]") jql search parser

[Ramonde Zrihen]

Hi,

i need to (create+update issue listener)
- calculate latest date(CF) for certain issues considering its sub-task and linked issues, 
- update latest date in date(CF) of issue 

i want to use jql search with issueFunction in linkedIssuesOfAll("")

1. issuekey 
2. linkType : blocks, finish together with, done before etc'

i am struggling with parser section converting this jql search to 'proper strings'

please help !

Many Thanks !!