replacement cache subsystem that's gestated in 2.1 and 3.0.

it rocks your world, baby.

svn path=/main/branches/2.0/; revision=2257

1 files changed, 88 insertions, 0 deletions

diff --git a/pym/cache/metadata.py b/pym/cache/metadata.py
new file mode 100644
index 000000000..5e5f0bde7
--- /dev/null
+++ b/pym/cache/metadata.py
@@ -0,0 +1,88 @@
+# Copyright: 2005 Gentoo Foundation
+# Author(s): Brian Harring (ferringb@gentoo.org)
+# License: GPL2
+# $Id: metadata.py 1964 2005-09-03 00:16:16Z ferringb $
+
+import os, stat
+import flat_hash
+import cache_errors
+import eclass_cache 
+from template import reconstruct_eclasses, serialize_eclasses
+from mappings import ProtectedDict, LazyLoad
+
+# this is the old cache format, flat_list.  count maintained here.
+magic_line_count = 22
+
+# store the current key order *here*.
+class database(flat_hash.database):
+	complete_eclass_entries = False
+	auxdbkey_order=('DEPEND', 'RDEPEND', 'SLOT', 'SRC_URI',
+		'RESTRICT',  'HOMEPAGE',  'LICENSE', 'DESCRIPTION',
+		'KEYWORDS',  'INHERITED', 'IUSE', 'CDEPEND',
+		'PDEPEND',   'PROVIDE', 'EAPI')
+
+	autocommits = True
+
+	def __init__(self, location, *args, **config):
+		loc = location
+		super(database, self).__init__(location, *args, **config)
+		self.location = os.path.join(loc, "metadata","cache")
+		self.ec = eclass_cache.cache(loc)
+
+	def __getitem__(self, cpv):
+		return flat_hash.database.__getitem__(self, cpv)
+
+
+	def _parse_data(self, data, mtime):
+		# easy attempt first.
+		data = list(data)
+		if len(data) != magic_line_count:
+			d = flat_hash.database._parse_data(self, data, mtime)
+		else:
+			# this one's interesting.
+			d = {}
+
+			for line in data:
+				# yes, meant to iterate over a string.
+				hashed = False
+				# poor mans enumerate.  replace when python 2.3 is required
+				for idx, c in zip(range(len(line)), line):
+					if not c.isalpha():
+						if c == "=" and idx > 0:
+							hashed = True
+							d[line[:idx]] = line[idx + 1:]
+						elif c == "_" or c.isdigit():
+							continue
+						break
+					elif not c.isupper():
+						break
+			
+				if not hashed:
+					# non hashed.
+					d.clear()
+					# poor mans enumerate.  replace when python 2.3 is required
+					for idx, key in zip(range(len(self.auxdbkey_order)), self.auxdbkey_order):
+						d[key] = data[idx].strip()
+					break
+
+		if "_eclasses_" not in d:
+			if "INHERITED" in d:
+				d["_eclasses_"] = self.ec.get_eclass_data(d["INHERITED"].split(), from_master_only=True)
+				del d["INHERITED"]
+		else:
+			d["_eclasses_"] = reconstruct_eclasses(cpv, d["_eclasses_"])
+
+		return d
+
+
+		
+	def _setitem(self, cpv, values):
+		values = ProtectedDict(values)
+		
+		# hack.  proper solution is to make this a __setitem__ override, since template.__setitem__ 
+		# serializes _eclasses_, then we reconstruct it.
+		if "_eclasses_" in values:
+			values["INHERITED"] = ' '.join(reconstruct_eclasses(cpv, values["_eclasses_"]).keys())
+			del values["_eclasses_"]
+
+		flat_hash.database._setitem(self, cpv, values)