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authorRené 'Necoro' Neumann <necoro@necoro.net>2009-08-14 15:54:22 +0200
committerRené 'Necoro' Neumann <necoro@necoro.net>2009-08-14 15:54:22 +0200
commit0e6702e069aeabcd995b8968d0ebbc1593d59bf6 (patch)
treec41cd3af8bdb1a3bc0b20d95d7cf9c55934a5ab2 /portato/eix/parser.py
parent1e88fe3bee51cd04928499f8ec29e00cf129ad33 (diff)
downloadportato-0e6702e069aeabcd995b8968d0ebbc1593d59bf6.tar.gz
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Add header-object
Diffstat (limited to 'portato/eix/parser.py')
-rw-r--r--portato/eix/parser.py44
1 files changed, 35 insertions, 9 deletions
diff --git a/portato/eix/parser.py b/portato/eix/parser.py
index 676cdd5..90c569b 100644
--- a/portato/eix/parser.py
+++ b/portato/eix/parser.py
@@ -15,7 +15,8 @@ from __future__ import absolute_import, with_statement
import os
import struct
-from .helper import debug
+from ..helper import debug
+from functools import partial
from . import exceptions as ex
@@ -30,7 +31,7 @@ def _get_bytes (file, length, expect_list = False):
else:
return struct.unpack("%sB" % length, s)
-def number (file):
+def number (file, skip = False):
n = _get_bytes(file, 1)
if n < 0xFF:
@@ -49,10 +50,16 @@ def number (file):
value = n << (count*8)
if count > 0:
- rest = _get_bytes(file, count, expect_list = True)
- for i, r in enumerate(rest):
- value += r << ((count - i - 1)*8)
+ if skip:
+ file.seek(count, os.SEEK_CUR)
+ return
+
+ else:
+ rest = _get_bytes(file, count, expect_list = True)
+
+ for i, r in enumerate(rest):
+ value += r << ((count - i - 1)*8)
return value
@@ -65,11 +72,15 @@ def vector (file, get_type, skip = False):
else:
return [get_type(file) for i in range(nelems)]
+def typed_vector(type):
+ return partial(vector, get_type = type)
+
def string (file, skip = False):
nelems = number(file)
if skip:
file.seek(nelems, os.SEEK_CUR)
+ return
else:
s = file.read(nelems)
@@ -92,17 +103,32 @@ class LazyElement (object):
self._value = None
self.pos = file.tell()
- get_type(skip=True) # skip it for the moment
+ get_type(file, skip=True) # skip it for the moment
@property
def value (self):
if self._value is None:
old_pos = self.file.tell()
- self.file.seek(self.pos)
- self._value = self.get_type(skip = False)
- self.file.seek(old_pos)
+ self.file.seek(self.pos, os.SEEK_SET)
+ self._value = self.get_type(self.file, skip = False)
+ self.file.seek(old_pos, os.SEEK_SET)
return self._value
def __call__ (self):
return self.value
+
+class header (object):
+ def __init__ (self, file):
+ def LE (t):
+ return LazyElement(t, file)
+
+ self.version = LE(number)
+ self.ncats = LE(number)
+ self.overlays = LE(typed_vector(overlay))
+ self.provide = LE(typed_vector(string))
+ self.licenses = LE(typed_vector(string))
+ self.keywords = LE(typed_vector(string))
+ self.useflags = LE(typed_vector(string))
+ self.slots = LE(typed_vector(string))
+ self.sets = LE(typed_vector(string))