AlabLan opened a new pull request, #522:
URL: https://github.com/apache/casbin-jcasbin/pull/522
## Summary
Added the keyGet3 function to jcasbin for the `{var}` placeholder style,
which was previously only available in the Go version.
## Problem
The documentation at https://casbin.apache.org/docs/function shows keyGet3
function, but jcasbin only implemented keyGet and keyGet2.
## Implementation
- Added KeyGet3Func wrapper class
- Added keyGet3Func implementation in BuiltInFunctions
- Registered keyGet3 in FunctionMap
- Added comprehensive tests ported from Go's TestKeyGet3
## Note on Go/Java Regex Incompatibility
The following Go test cases fail in Java due to regex engine differences:
- testKeyGet3("/{id/using/myresid", "/{id/using/{resId}", "resId",
"myresid")
- testKeyGet3("/{id/using/myresid/status}", "/{id/using/{resId}/status}",
"resId", "myresid")
- testKeyGet3("/api/group1_group_name/project1_admin/info",
"/api/{proj}_admin/info", "proj", "")
Java treats `{` as a repetition quantifier modifier, so patterns like
"/{id/using/(" are invalid. The Java implementation adds escaping for remaining
`{` and `}` characters after the key replacement to
handle this incompatibility.
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