[poky-contrib][RFC PATCH 4/5] license.bbclass: Add functions to split and canonicalise license strings

["Meh Mbeh Ida Delphine" <idadelm@gmail.com>]

These functions that will later be used in package.bbclass simply make the source and recipe licenses in the same format so that they can easily be compared and the ouput warnings filtered accordingly.
split_spdx_lic() splits the license strings and returns a set of the canonicalised licenses.
rem_false_lics() does two things:
- Converts '-or-later' licenses to their canonicalised form
- Gets rid of "WITH Linux-syscall-note" from license string if specified in local.conf

Signed-off-by: Ida Delphine <idadelm@gmail.com>
---
 meta/classes/license.bbclass | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/meta/classes/license.bbclass b/meta/classes/license.bbclass
index dc91118340..576464cb26 100644
--- a/meta/classes/license.bbclass
+++ b/meta/classes/license.bbclass
@@ -435,3 +435,30 @@ python do_populate_lic_setscene () {
     sstate_setscene(d)
 }
 addtask do_populate_lic_setscene
+
+
+def split_spdx_lic(d, licensestr):
+    """
+    Split the license strings and returns a set of the
+    canonicalised licenses.
+    """
+    import oe.license
+    split_lic = oe.license.list_licenses(licensestr)
+    spdx_lic = set([canonical_license(d, l) for l in split_lic])
+    return spdx_lic
+
+def rem_false_lics(d, pkglic):
+    pkglicsperpkg = set([])
+    for l in pkglic:
+        if l.endswith('-or-later'):
+            # Converts '-or-later' licenses to their canonicalised form
+            lic_ = l.replace('-or-later', '+')
+            pkglicsperpkg.add(lic_)
+        elif l.endswith(' WITH Linux-syscall-note'):
+        # Gets rid of "WITH Linux-syscall-note from license sring"
+            if d.getVar("LICENSE_WITH_LINUX_SYS") == "1":
+                lic_ = l.replace(' WITH Linux-syscall-note', '')
+                pkglicsperpkg.add(lic_)
+        else:
+            pkglicsperpkg.add(l)
+    return pkglicsperpkg
\ No newline at end of file
-- 
2.25.1