feat(spdx-utils)!: Ensure matching digits in simple license mappings

But tolerate differences in trailing zeros. This makes simple license
mapping more trustworthy by removing cases that were already identified
to be ambiguous with one exception: `ALv2: Apache-2.0` is accepted as
non-ambiguous now.

However, 12 other licenses are removed for beign ambiguous now, as they
do not contain sufficient indicators for the version of the license or
variant.

Signed-off-by: Sebastian Schuberth <[email protected]>

Author: sschuberth

utils/spdx/src/main/resources/simple-license-mapping.yml

@@ -22,34 +22,8 @@
 # Sort the entries below via IntelliJ's "Edit" -> "Sort Lines".
 ---
 
-# Ambiguous mappings (mapping reason not obvious without additional information)
-ALv2: Apache-2.0
-ASL: Apache-2.0
-Apache-style: Apache-2.0
-Apache: Apache-2.0
-BSD-like: BSD-3-Clause
-BSD-style: BSD-3-Clause
-BSD: BSD-3-Clause
-GPL: GPL-2.0-or-later
-MPL: MPL-2.0
-afl: AFL-3.0
-agpl: AGPL-3.0-or-later
-apache-license: Apache-2.0
-bsd-license: BSD-3-Clause
-bsd-licensed: BSD-3-Clause
-cddl: CDDL-1.0
-efl: EFL-2.0
-epl: EPL-1.0
-eupl: EUPL-1.0
-fdl: GFDL-1.3-or-later
-gfdl: GFDL-1.3-or-later
-gpl-license: GPL-2.0-or-later
-psf: PSF-2.0
-psfl: PSF-2.0
-python: Python-2.0
-
-# Non-ambiguous mappings
 AFLv2.1: AFL-2.1
+ALv2: Apache-2.0
 APACHEv2: Apache-2.0
 APL2: Apache-2.0
 APLv2.0: Apache-2.0
@@ -59,11 +33,7 @@ Apache2: Apache-2.0
 BSD-3: BSD-3-Clause
 BSD2: BSD-2-Clause
 BSD3: BSD-3-Clause
-Boost: BSL-1.0
 Bouncy: MIT
-CC0: CC0-1.0
-CPL: CPL-1.0
-CeCILL: CECILL-1.1
 EDL-1.0: BSD-3-Clause
 FreeBSD: BSD-2-Clause-Views
 GPL-2: GPL-2.0-only
@@ -74,31 +44,24 @@ GPLv3+: GPL-3.0-or-later
 GPLv3: GPL-3.0-only
 ISCL: ISC
 LGPL-3: LGPL-3.0-only
-LGPL2: LGPL-2.1-only
 LGPL3: LGPL-3.0-only
-LGPL: LGPL-2.0-or-later
-LGPLv2: LGPL-2.1-only
 LGPLv3+: LGPL-3.0-or-later
 LGPLv3: LGPL-3.0-only
 MIT-like: MIT
 MIT-style: MIT
 MPLv2.0: MPL-2.0
 MPLv2: MPL-2.0
-ODBL: ODbL-1.0
 PSF2: PSF-2.0
 UNLICENSED: Unlicense
 Unlicence: Unlicense
-Vovida: VSL-1.0
 afl-2: AFL-2.0
 afl2.0: AFL-2.0
 afl2.1: AFL-2.1
 afl2: AFL-2.0
 bouncy-license: MIT
 bsl1.0: BSL-1.0
-bsl: BSL-1.0
 cddl1.0: CDDL-1.0
 cddl1.1: CDDL-1.1
-cpal: CPAL-1.0
 epl1.0: EPL-1.0
 epl2.0: EPL-2.0
 eupl1.0: EUPL-1.0
@@ -113,4 +76,3 @@ mpl2.0: MPL-2.0
 mpl2: MPL-2.0
 w3cl: W3C
 wtf: WTFPL
-zope: ZPL-2.1

utils/spdx/src/test/kotlin/SpdxSimpleLicenseMappingTest.kt

@@ -57,6 +57,23 @@ class SpdxSimpleLicenseMappingTest : WordSpec({
                 if (license.id.endsWith("-only")) key should containADigit()
             }
         }
+
+        "contain matching digits disregarding trailing zeros" {
+            val exceptions = mapOf(
+                // See https://www.eclipse.org/org/documents/edl-v10.php.
+                "EDL-1.0" to SpdxLicense.BSD_3_CLAUSE,
+                // See https://spdx.org/licenses/BSD-2-Clause-Views.html.
+                "FreeBSD" to SpdxLicense.BSD_2_CLAUSE_VIEWS
+            )
+
+            SpdxSimpleLicenseMapping.simpleLicenseMapping.filterNot {
+                it in exceptions.entries
+            }.forAll { (key, license) ->
+                val digitsInKey = key.filter { it.isDigit() }.dropLastWhile { it == '0' }
+                val digitsInLicense = license.id.filter { it.isDigit() }.dropLastWhile { it == '0' }
+                digitsInKey shouldBe digitsInLicense
+            }
+        }
     }
 
     "The simple expression mapping" should {