write function such that we get extra-words for 2-aho

Signed-off-by: Alok Kumar <alokkumarjipura9973@gmail.com>

Author: alok1304

src/licensedcode/detection.py

@@ -1055,10 +1055,27 @@ def is_correct_detection_non_unknown(license_matches):
     are correct/perfect license detections and also there aren't any unknowns.
     """
     return (
-        is_correct_detection(license_matches)
+        is_correct_detection_2(license_matches)
         and not has_unknown_matches(license_matches)
     )
 
+def is_correct_detection_2(license_matches):
+    """
+    Return True if all the matches in ``license_matches`` List of LicenseMatch
+    are perfect license detections, and the matcher is always either `1-hash` 
+    or `1-spdx-id`.
+    """
+    matchers = (license_match.matcher for license_match in license_matches)
+    is_match_coverage_perfect = [
+        license_match.coverage() == 100
+        for license_match in license_matches
+    ]
+
+    return (
+        all(matcher in ("1-hash", "1-spdx-id") for matcher in matchers)
+        and all(is_match_coverage_perfect)
+    )    
+
 
 def is_correct_detection(license_matches):
     """
@@ -1734,7 +1751,7 @@ def analyze_detection(license_matches, package_license=False):
     ):
         return DetectionCategory.LICENSE_CLUES.value
 
-    # Case where all matches have `matcher` as `1-hash` or `4-spdx-id`
+    # Case where all matches have `matcher` as `1-hash` or `1-spdx-id`
     elif is_correct_detection_non_unknown(license_matches=license_matches):
         return DetectionCategory.PERFECT_DETECTION.value
 

tests/licensedcode/data/plugin_license/extra-words/scan-extra-words-2-aho-license.expected.json

@@ -5,7 +5,9 @@
       "license_expression": "bsd-new",
       "license_expression_spdx": "BSD-3-Clause",
       "detection_count": 1,
-      "detection_log": [],
+      "detection_log": [
+        "extra-words"
+      ],
       "reference_matches": [
         {
           "license_expression": "bsd-new",
@@ -54,7 +56,9 @@
               "matched_text_diagnostics": "Redistribution and use in source and binary forms, with or without\r\nmodification, are permitted provided that the following conditions are met:\r\n\r\n* Redistributions of source code must retain the above copyright notice, this\r\n  list of conditions and the following disclaimer.\r\n\r\n* Redistributions in binary form must reproduce the above copyright notice,\r\n  this list of conditions and the following disclaimer in the documentation\r\n  and/or other materials provided with the distribution.\r\n\r\n* Neither the name of [filesize] nor the names of its\r\n  contributors may be used to endorse or promote products derived from\r\n  this software without specific prior written permission.\r\n\r\nTHIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\"\r\nAND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r\nIMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE\r\nDISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE\r\nFOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r\nDAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR\r\nSERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER\r\nCAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,\r\nOR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\r\nOF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
             }
           ],
-          "detection_log": [],
+          "detection_log": [
+            "extra-words"
+          ],
           "identifier": "bsd_new-fbfc5955-0c63-4c98-2ce9-08e1e1796f50"
         }
       ],