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# R overlay -- dependency resolution, dependency environment
# -*- coding: utf-8 -*-
# Copyright (C) 2012 André Erdmann <dywi@mailerd.de>
# Distributed under the terms of the GNU General Public License;
# either version 2 of the License, or (at your option) any later version.
"""dependency environment
This module implements DepEnv, a dependency environment that is used during
dependency resolution. Typically, a DepEnv instance contains the original
dependency string to be looked up, its resolution progess ("to be resolved",
"is resolved, resolved by <>", "unresolvable") and some calculated data.
"""
__all__ = [ 'DepEnv', ]
import re
import string
import roverlay.versiontuple
from roverlay import strutil
def make_regexes ( regex_patterns, fmt_kwargs ):
"""Generator that (string-)formats regexes and compiles them afterwards.
arguments:
* regex_patterns --
* fmt_kwargs --
"""
formatter = string.Formatter()
for s in regex_patterns:
yield re.compile ( formatter.vformat ( s, (), fmt_kwargs ) )
# --- end of make_regexes (...) ---
class DepEnv ( object ):
"""Dependency environment
class-wide variables:
* VERSION_REGEX -- a set of regexes (compiled) that match dependency
strings that can be used by fuzzy dependency
resolution
* FIXVERSION_REGEX -- a regex (compiled) used to replace R package
version separator chars '_', '-' with dots '.'.
* URI_PURGE -- a regex (compiled) that matches "useless" uri
statements from dependency strings, e.g.
"GDAL library from http://..." => "GDAL library"
* WHITESPACE -- a regex (compiled) that matches whitespace
* TRY_ALL_REGEXES -- a bool that controls whether _depsplit() should
stop after the first matching regex (which should
be fine since the regexes currently used are
mutually exclusive)
class-wide integer variables used with bitwise operations:
* STATUS_UNDONE -- indicates that a DepEnv has to be processed
* STATUS_RESOLVED -- indicates that a DepEnv has been resolved
* STATUS_UNRESOLVABLE -- indicates that a DepEnv is unresolvable
"""
# integer representation of version modifiers
## duplicate of versiontuple.py
VMOD_NONE = roverlay.versiontuple.VMOD_NONE
VMOD_UNDEF = roverlay.versiontuple.VMOD_UNDEF
VMOD_NOT = roverlay.versiontuple.VMOD_NOT
VMOD_EQ = roverlay.versiontuple.VMOD_EQ
VMOD_NE = roverlay.versiontuple.VMOD_NE
VMOD_GT = roverlay.versiontuple.VMOD_GT
VMOD_GE = roverlay.versiontuple.VMOD_GE
VMOD_LT = roverlay.versiontuple.VMOD_LT
VMOD_LE = roverlay.versiontuple.VMOD_LE
VMOD = {
'!=' : VMOD_NE,
'=' : VMOD_EQ,
#'==' : VMOD_EQ, # normalized by _depslit()
'>' : VMOD_GT,
'>=' : VMOD_GE,
'<' : VMOD_LT,
'<=' : VMOD_LE,
}
# name/version regexes used for fuzzy dep rules
VERSION_REGEX = frozenset ( make_regexes (
[
# 'R >= 2.15', 'R >=2.15' etc. (but not 'R>=2.15'!)
'^{prefix}?\s*{name}\s+{vermod}?\s*{ver}\s*{suffix}?\s*$',
# 'R (>= 2.15)', 'R(>=2.15)' etc.
'^{prefix}?\s*{name}\s*\(\s*{vermod}?\s*{ver}\s*\)\s*{suffix}?$',
# 'R [>= 2.15]', 'R[>=2.15]' etc.
'^{prefix}?\s*{name}\s*\[\s*{vermod}?\s*{ver}\s*\]\s*{suffix}?$',
# 'R {>= 2.15}', 'R{>=2.15}' etc.
'^{prefix}?\s*{name}\s*\{{\s*{vermod}?\s*{ver}\s*\}}\s*{suffix}?$',
],
{
# name matches a dependency name, e.g. "GDAL library"
# (the " library" suffix gets removed, see suffix pattern below)
#
# excluding A-Z since dep_str_low will be used to find a match
# name ::= word{<whitespace><word>}
'name' : '(?P<name>[a-z0-9_\-/.:+-]+(\s+[a-z0-9_\-/.+-]+)*)',
# version matches a dependency version, e.g. "1.4"
# ver ::= [[<version_separator>]*<digit>[<digit>]*]*
# digit ::= {0..9}
# version_separator ::= {'.','_','-'}
# examples: .9, 1.0-5, 3, 5..-_--2
'ver' : '(?P<ver>[0-9._\-]+)',
# dependency version modifier
# any of { <, >, ==, <=, >=, =, != }
'vermod' : '(?P<vmod>[<>]|[=<>!]?[=])',
# str prefixes/suffixes that should be ignored
'prefix' : '(?P<name_prefix>for building from source[:])',
'suffix' : '(?P<name_suffix>lib|library)',
}
) )
FIXVERSION_REGEX = re.compile ( '[_\-]' )
URI_PURGE = re.compile ( '\s*from\s*(http|ftp|https)://[^\s]+' )
WHITESPACE = re.compile ( '\s+' )
#AND_SPLIT = re.compile ( '\s+and\s+|\s+&&\s+', flags=re.IGNORECASE )
AND_SPLIT = re.compile ( '\s+and\s+', flags=re.IGNORECASE )
# try all version regexes if True, else break after first match
TRY_ALL_REGEXES = False
STATUS_UNDONE = 1
STATUS_RESOLVED = 2
STATUS_UNRESOLVABLE = 4
@classmethod
def from_str ( cls, dep_str, deptype_mask, package_ref=None ):
"""Generator that (pre-)parses a dependency string and creates
DepEnv objects for it.
arguments:
* dep_str --
* deptype_mask --
* package_ref --
"""
# split dep_str into logically ANDed dependency strings,
# unquote them, remove "from <uri>.." entries and replace all
# whitespace by a single ' ' char
for substring in cls.AND_SPLIT.split ( dep_str ):
yield cls (
dep_str = (
cls.WHITESPACE.sub ( ' ',
cls.URI_PURGE.sub ( '',
strutil.unquote ( substring )
)
).strip()
),
deptype_mask = deptype_mask,
package_ref = package_ref,
)
# --- end of from_str (...) ---
def __init__ ( self, dep_str, deptype_mask, package_ref=None ):
"""Initializes a dependency environment that represents the dependency
resolution of one entry in the description data of an R package.
Precalculating most (if not all) data since this object will be passed
through many dep rules.
arguments:
* dep_str -- dependency string at it appears in the description data.
* deptype_mask --
* package_ref --
"""
self.deptype_mask = deptype_mask
self.status = DepEnv.STATUS_UNDONE
self.resolved_by = None
self.package_ref = package_ref
if package_ref is not None:
self.get_package_info = self._deref_package_info
self.repo_id = (
package_ref.deref_safe().get ( 'origin' ).get_identifier()
)
else:
self.get_package_info = self._deref_none
self.repo_id = None
self.dep_str = dep_str
self.dep_str_low = dep_str.lower()
self.try_all_regexes = self.__class__.TRY_ALL_REGEXES
self._depsplit()
# (maybe) TODO: analyze dep_str: remove useless comments,...
# --- end of __init__ (...) ---
def _deref_none ( self ):
return None
# --- end of _deref_none (...) ---
def _deref_package_info ( self ):
return self.package_ref.deref_safe()
# --- end of _deref_package_info (...) ---
def _depsplit ( self ):
result = list()
for r in self.__class__.VERSION_REGEX:
m = r.match ( self.dep_str_low )
if m is not None:
version = self.__class__.FIXVERSION_REGEX.sub (
'.', m.group ( 'ver' )
)
# fix versions like ".9" (-> "0.9")
if version [0] == '.': version = '0' + version
vmod = m.group ( 'vmod' )
if not vmod:
# version required, but no modifier: set vmod to '>='
vmod = '>='
elif vmod == '==':
# "normalize"
vmod = '='
version_strlist = version.split ( '.' )
version_iparts = list()
for v in version_strlist:
#i = None
try:
i = int ( v )
version_iparts.append ( i )
except ValueError:
v2 = v.partition ( '_' )[0].partition ( '-' ) [0]
version_iparts.append ( int ( v2 ) if v2 else 0 )
result.append ( dict (
name = m.group ( 'name' ),
name_low = m.group ( 'name' ).lower(),
version_modifier = vmod,
version = version,
version_strlist = version_strlist,
version_tuple = roverlay.versiontuple.IntVersionTuple (
version_iparts
),
vmod = self.VMOD.get ( vmod, self.VMOD_UNDEF ),
) )
if not self.try_all_regexes: break
if result:
self.fuzzy = tuple ( result )
# --- end of _depsplit (...) ---
def set_resolved ( self, resolved_by, append=False ):
"""Marks this DepEnv as resolved with resolved_by as corresponding
portage package.
arguments:
* resolved_by -- resolving portage package
* append -- whether to append resolved_by or not; NOT IMPLEMENTED
"""
if self.resolved_by is None:
self.resolved_by = resolved_by
elif append:
# useful?
raise Exception ( "appending is not supported..." )
else:
raise Exception (
"dependency is already resolved and append is disabled."
)
# add RESOLVED status
self.status |= DepEnv.STATUS_RESOLVED
# --- end of set_resolved (...) ---
def set_unresolvable ( self, force=False ):
"""Marks this DepEnv as unresolvable.
arguments:
force -- force unresolvable status even if this DepEnv
is already resolved
"""
if force or not self.status & DepEnv.STATUS_RESOLVED:
self.resolved_by = None
self.status |= DepEnv.STATUS_UNRESOLVABLE
else:
raise Exception ("dependency is already marked as resolved." )
# --- end of set_unresolvable (...) ---
def zap ( self ):
"""Resets the status of this DepEnv and clears out all resolving pkgs."""
self.status = DepEnv.STATUS_UNDONE
self.resolved_by = None
# --- end of zap (...) ---
def is_resolved ( self ):
"""Returns True if this DepEnv is resolved, else false."""
return bool ( self.status & DepEnv.STATUS_RESOLVED )
# --- end of is_resolved (...) ---
def get_result ( self ):
"""Returns the result of this DepEnv as a tuple
( original dep str, resolving portage package ) where resolving portage
package may be None.
"""
return ( self.dep_str, self.resolved_by )
# --- end of get_result (...) ---
def get_resolved ( self ):
return self.resolved_by
# --- end of get_resolved (...) ---
# --- end of DepEnv ---
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