fix: list of available language parsers (fixes #4334) (#4336)

* fixes #4334  
* fixes #4328

cve_bin_tool/parsers/parse.py

@@ -75,6 +75,19 @@ def load_valid_files() -> dict[str, list[type[Parser]]]:
 valid_files = load_valid_files()
 
 
+def identify_parsers() -> list:
+    """Reports names of parsers"""
+    parsers = []
+    for i in BUILTIN_PARSERS.items():
+        parser = i[0].split(".")[0]
+        if parser not in parsers:
+            parsers.append(parser)
+    return parsers
+
+
+available_parsers = identify_parsers()
+
+
 def parse(filename, output, cve_db, logger):
     """
     Parses the given filename using the appropriate parser.

cve_bin_tool/version_scanner.py

@@ -2,7 +2,6 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 from __future__ import annotations
 
-import itertools
 import subprocess
 import sys
 from logging import Logger
@@ -16,7 +15,7 @@
 from cve_bin_tool.extractor import Extractor, TempDirExtractorContext
 from cve_bin_tool.file import is_binary
 from cve_bin_tool.log import LOGGER
-from cve_bin_tool.parsers.parse import parse, valid_files
+from cve_bin_tool.parsers.parse import available_parsers, parse, valid_files
 from cve_bin_tool.strings import parse_strings
 from cve_bin_tool.util import (
     DirWalk,
@@ -137,7 +136,7 @@ def number_of_checkers(self) -> int:
     @classmethod
     def available_language_checkers(cls) -> list[str]:
         """Find Language checkers"""
-        return list(sorted(map(str, set(itertools.chain(*valid_files.values())))))
+        return sorted(available_parsers)
 
     def print_language_checkers(self) -> None:
         """Logs the message that lists the names of the language checkers"""