* Replace config._iuse_implicit_re with a callable _iuse_implicit_match

  object that simply returns boolean, and update consumers.
* Make check_required_use() take a callable for the iuse parameter,
  and pass in Package.use.is_valid_flag or iuse.__contains__ as
   appropriate.

6 files changed, 29 insertions, 31 deletions

diff --git a/pym/_emerge/Package.py b/pym/_emerge/Package.py
index 2941b273d..640f8bca1 100644
--- a/pym/_emerge/Package.py
+++ b/pym/_emerge/Package.py
@@ -201,11 +201,11 @@ class Package(Task):
 	class _iuse(object):
 
 		__slots__ = ("__weakref__", "all", "enabled", "disabled",
-			"tokens") + ("_iuse_implicit_regex",)
+			"tokens") + ("_iuse_implicit_match",)
 
-		def __init__(self, tokens, iuse_implicit_regex):
+		def __init__(self, tokens, iuse_implicit_match):
 			self.tokens = tuple(tokens)
-			self._iuse_implicit_regex = iuse_implicit_regex
+			self._iuse_implicit_match = iuse_implicit_match
 			enabled = []
 			disabled = []
 			other = []
@@ -231,7 +231,7 @@ class Package(Task):
 
 			for flag in flags:
 				if not flag in self.all and \
-					self._iuse_implicit_regex.match(flag) is None:
+					not self._iuse_implicit_match(flag):
 					return False
 			return True
 		
@@ -244,7 +244,7 @@ class Package(Task):
 			missing_iuse = []
 			for flag in flags:
 				if not flag in self.all and \
-					self._iuse_implicit_regex.match(flag) is None:
+					not self._iuse_implicit_match(flag):
 					missing_iuse.append(flag)
 			return missing_iuse
 
@@ -362,7 +362,7 @@ class _PackageMetadataWrapper(_PackageMetadataWrapperBase):
 
 	def _set_iuse(self, k, v):
 		self._pkg.iuse = self._pkg._iuse(
-			v.split(), self._pkg.root_config.settings._iuse_implicit_re)
+			v.split(), self._pkg.root_config.settings._iuse_implicit_match)
 
 	def _set_slot(self, k, v):
 		self._pkg.slot = v
diff --git a/pym/_emerge/depgraph.py b/pym/_emerge/depgraph.py
index 01afa88c1..f4d251478 100644
--- a/pym/_emerge/depgraph.py
+++ b/pym/_emerge/depgraph.py
@@ -2036,7 +2036,6 @@ class depgraph(object):
 		missing_licenses = []
 		have_eapi_mask = False
 		pkgsettings = self._frozen_config.pkgsettings[root]
-		implicit_iuse = pkgsettings._get_implicit_iuse()
 		root_config = self._frozen_config.roots[root]
 		portdb = self._frozen_config.roots[root].trees["porttree"].dbapi
 		dbs = self._dynamic_config._filtered_trees[root]["dbs"]
@@ -2672,11 +2671,9 @@ class depgraph(object):
 						eapi_has_required_use(pkg.metadata["EAPI"]):
 						required_use = pkg.metadata["REQUIRED_USE"]
 						use = pkg.use.enabled
-						iuse = self._frozen_config.settings._get_implicit_iuse()
-						iuse.update(pkg.iuse.all)
 						try:
 							required_use_is_sat = portage.dep.check_required_use(
-								pkg.metadata["REQUIRED_USE"], use, iuse)
+								pkg.metadata["REQUIRED_USE"], use, pkg.iuse.is_valid_flag)
 						except portage.exception.InvalidDependString as e:
 							portage.writemsg("!!! Invalid REQUIRED_USE specified by " + \
 								"'%s': %s\n" % (pkg.cpv, str(e)), noiselevel=-1)
@@ -6058,11 +6055,9 @@ def _get_masking_status(pkg, pkgsettings, root_config):
 			eapi_has_required_use(pkg.metadata["EAPI"]):
 			required_use = pkg.metadata["REQUIRED_USE"]
 			use = pkg.use.enabled
-			iuse = pkgsettings._get_implicit_iuse()
-			iuse.update(pkg.iuse.all)
 			try:
 				required_use_is_sat = portage.dep.check_required_use(
-					required_use, use, iuse)
+					required_use, use, pkg.iuse.is_valid_flag)
 			except portage.exception.InvalidDependString:
 				mreasons.append("invalid: REQUIRED_USE")
 			else:
diff --git a/pym/portage/dbapi/__init__.py b/pym/portage/dbapi/__init__.py
index 99fb55723..3803339d5 100644
--- a/pym/portage/dbapi/__init__.py
+++ b/pym/portage/dbapi/__init__.py
@@ -145,7 +145,7 @@ class dbapi(object):
 		2) Check enabled/disabled flag states.
 		"""
 
-		iuse_implicit_re = self.settings._iuse_implicit_re
+		iuse_implicit_match = self.settings._iuse_implicit_match
 		for cpv in cpv_iter:
 			try:
 				iuse, slot, use = self.aux_get(cpv, ["IUSE", "SLOT", "USE"])
@@ -156,7 +156,7 @@ class dbapi(object):
 			missing_iuse = False
 			for x in atom.use.required:
 				if x not in iuse and x not in atom.use.missing_enabled \
-					and x not in atom.use.missing_disabled and iuse_implicit_re.match(x) is None:
+					and x not in atom.use.missing_disabled and not iuse_implicit_match(x):
 					missing_iuse = True
 					break
 			if missing_iuse:
diff --git a/pym/portage/dep/__init__.py b/pym/portage/dep/__init__.py
index 98d248938..ecce5d0c5 100644
--- a/pym/portage/dep/__init__.py
+++ b/pym/portage/dep/__init__.py
@@ -1635,7 +1635,7 @@ def match_from_list(mydep, candidate_list):
 			mylist.append(x)
 	return mylist
 
-def check_required_use(required_use, use, iuse):
+def check_required_use(required_use, use, iuse_match):
 	"""
 	Checks if the use flags listed in 'use' satisfy all
 	constraints specified in 'constraints'.
@@ -1644,8 +1644,9 @@ def check_required_use(required_use, use, iuse):
 	@type constraints: String
 	@param use: Enabled use flags
 	@param use: List
-	@param iuse: Referenceable use flags
-	@param iuse: List
+	@param iuse_match: Callable that takes a single flag argument and returns
+		True if the flag is matched, false otherwise,
+	@param iuse_match: Callable
 	@rtype: Bool
 	@return: Indicates if REQUIRED_USE constraints are satisfied
 	"""
@@ -1658,7 +1659,7 @@ def check_required_use(required_use, use, iuse):
 			flag = token
 			is_negated = False
 
-		if not flag or not flag in iuse:
+		if not flag or not iuse_match(flag):
 			raise portage.exception.InvalidDependString(
 				_("malformed syntax: '%s'") % required_use)
 
diff --git a/pym/portage/package/ebuild/config.py b/pym/portage/package/ebuild/config.py
index b0cd72ce9..3c3d72603 100644
--- a/pym/portage/package/ebuild/config.py
+++ b/pym/portage/package/ebuild/config.py
@@ -110,15 +110,19 @@ def _lazy_iuse_regex(iuse_implicit):
 
 class _iuse_implicit_match_cache(object):
 
-	def __init__(self, iuse_implicit_re):
-		self._iuse_implicit_re = iuse_implicit_re
+	def __init__(self, settings):
+		self._iuse_implicit_re = re.compile("^(%s)$" % \
+			"|".join(settings._get_implicit_iuse()))
 		self._cache = {}
 
-	def match(self, flag):
+	def __call__(self, flag):
+		"""
+		Returns True if the flag is matched, False otherwise.
+		"""
 		try:
 			return self._cache[flag]
 		except KeyError:
-			m = self._iuse_implicit_re.match(flag)
+			m = self._iuse_implicit_re.match(flag) is not None
 			self._cache[flag] = m
 			return m
 
@@ -388,7 +392,7 @@ class config(object):
 			self.packages = clone.packages
 			self.useforce_list = clone.useforce_list
 			self.usemask_list = clone.usemask_list
-			self._iuse_implicit_re = clone._iuse_implicit_re
+			self._iuse_implicit_match = clone._iuse_implicit_match
 
 			self.user_profile_dir = copy.deepcopy(clone.user_profile_dir)
 			self.local_config = copy.deepcopy(clone.local_config)
@@ -1060,9 +1064,7 @@ class config(object):
 			if 'parse-eapi-ebuild-head' in self.features:
 				_validate_cache_for_unsupported_eapis = False
 
-			self._iuse_implicit_re = _iuse_implicit_match_cache(
-				re.compile("^(%s)$" % \
-				"|".join(self._get_implicit_iuse())))
+			self._iuse_implicit_match = _iuse_implicit_match_cache(self)
 
 		for k in self._case_insensitive_vars:
 			if k in self:
@@ -1587,7 +1589,7 @@ class config(object):
 		use = set(self["USE"].split())
 		if explicit_iuse is None:
 			explicit_iuse = frozenset(x.lstrip("+-") for x in iuse.split())
-		implicit_iuse_re = self._iuse_implicit_re
+		iuse_implicit_match = self._iuse_implicit_match
 		portage_iuse = self._get_implicit_iuse()
 		portage_iuse.update(explicit_iuse)
 
@@ -1616,7 +1618,7 @@ class config(object):
 		# Allow _* flags from USE_EXPAND wildcards to pass through here.
 		use.difference_update([x for x in use \
 			if (x not in explicit_iuse and \
-			implicit_iuse_re.match(x) is None) and x[-2:] != '_*'])
+			not iuse_implicit_match(x)) and x[-2:] != '_*'])
 
 		# Use the calculated USE flags to regenerate the USE_EXPAND flags so
 		# that they are consistent. For optimal performance, use slice
diff --git a/pym/portage/tests/dep/testCheckRequiredUse.py b/pym/portage/tests/dep/testCheckRequiredUse.py
index f09c963a8..9468ca394 100644
--- a/pym/portage/tests/dep/testCheckRequiredUse.py
+++ b/pym/portage/tests/dep/testCheckRequiredUse.py
@@ -85,9 +85,9 @@ class TestCheckRequiredUse(TestCase):
 		)
 
 		for required_use, use, iuse, expected in test_cases:
-			self.assertEqual(check_required_use(required_use, use, iuse), \
+			self.assertEqual(check_required_use(required_use, use, iuse.__contains__), \
 				expected, required_use + ", USE = " + " ".join(use))
 
 		for required_use, use, iuse in test_cases_xfail:
 			self.assertRaisesMsg(required_use + ", USE = " + " ".join(use), \
-				InvalidDependString, check_required_use, required_use, use, iuse)
+				InvalidDependString, check_required_use, required_use, use, iuse.__contains__)