poky/bitbake/lib/bb/data_smart.py
Richard Purdie 3492bff64a bitbake: Add codeparser for parsing shell and python functions
This commit is derived from Chris Larson's checksum work, turned into a
standalone piece of code for parsing python and shell functions.

The deindent code has been replaced with code to work around indentation
for speed. The original NodeVisitor in the ast was replaced with a faster
class walk call.

Signed-off-by: Richard Purdie <rpurdie@linux.intel.com>
2010-08-31 12:41:23 +01:00

372 lines
11 KiB
Python

# ex:ts=4:sw=4:sts=4:et
# -*- tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*-
"""
BitBake Smart Dictionary Implementation
Functions for interacting with the data structure used by the
BitBake build tools.
"""
# Copyright (C) 2003, 2004 Chris Larson
# Copyright (C) 2004, 2005 Seb Frankengul
# Copyright (C) 2005, 2006 Holger Hans Peter Freyther
# Copyright (C) 2005 Uli Luckas
# Copyright (C) 2005 ROAD GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Based on functions from the base bb module, Copyright 2003 Holger Schurig
import copy, re, sys
import bb
from bb import utils
from bb.COW import COWDictBase
__setvar_keyword__ = ["_append", "_prepend"]
__setvar_regexp__ = re.compile('(?P<base>.*?)(?P<keyword>_append|_prepend)(_(?P<add>.*))?')
__expand_var_regexp__ = re.compile(r"\${[^{}]+}")
__expand_python_regexp__ = re.compile(r"\${@.+?}")
class VariableParse:
def __init__(self, varname, d, val = None):
self.varname = varname
self.d = d
self.value = val
self.references = set()
self.execs = set()
def var_sub(self, match):
key = match.group()[2:-1]
if self.varname and key:
if self.varname == key:
raise Exception("variable %s references itself!" % self.varname)
var = self.d.getVar(key, 1)
if var is not None:
self.references.add(key)
return var
else:
return match.group()
def python_sub(self, match):
code = match.group()[3:-1]
codeobj = compile(code.strip(), self.varname or "<expansion>", "eval")
parser = bb.codeparser.PythonParser()
parser.parse_python(code)
self.references |= parser.references
self.execs |= parser.execs
value = utils.better_eval(codeobj, {"d": self.d})
return str(value)
class DataSmart:
def __init__(self, special = COWDictBase.copy(), seen = COWDictBase.copy() ):
self.dict = {}
# cookie monster tribute
self._special_values = special
self._seen_overrides = seen
self.expand_cache = {}
def expandWithRefs(self, s, varname):
if not isinstance(s, basestring): # sanity check
return VariableParse(varname, self, s)
if varname and varname in self.expand_cache:
return self.expand_cache[varname]
varparse = VariableParse(varname, self)
while s.find('${') != -1:
olds = s
try:
s = __expand_var_regexp__.sub(varparse.var_sub, s)
s = __expand_python_regexp__.sub(varparse.python_sub, s)
if s == olds:
break
except KeyboardInterrupt:
raise
except:
bb.msg.note(1, bb.msg.domain.Data, "%s:%s while evaluating:\n%s" % (sys.exc_info()[0], sys.exc_info()[1], s))
raise
varparse.value = s
if varname:
self.expand_cache[varname] = varparse
return varparse
def expand(self, s, varname):
return self.expandWithRefs(s, varname).value
def finalize(self):
"""Performs final steps upon the datastore, including application of overrides"""
overrides = (self.getVar("OVERRIDES", True) or "").split(":") or []
#
# Well let us see what breaks here. We used to iterate
# over each variable and apply the override and then
# do the line expanding.
# If we have bad luck - which we will have - the keys
# where in some order that is so important for this
# method which we don't have anymore.
# Anyway we will fix that and write test cases this
# time.
#
# First we apply all overrides
# Then we will handle _append and _prepend
#
for o in overrides:
# calculate '_'+override
l = len(o) + 1
# see if one should even try
if o not in self._seen_overrides:
continue
vars = self._seen_overrides[o]
for var in vars:
name = var[:-l]
try:
self[name] = self[var]
except Exception:
bb.msg.note(1, bb.msg.domain.Data, "Untracked delVar")
# now on to the appends and prepends
if "_append" in self._special_values:
appends = self._special_values["_append"] or []
for append in appends:
for (a, o) in self.getVarFlag(append, "_append") or []:
# maybe the OVERRIDE was not yet added so keep the append
if (o and o in overrides) or not o:
self.delVarFlag(append, "_append")
if o and not o in overrides:
continue
sval = self.getVar(append, False) or ""
sval += a
self.setVar(append, sval)
if "_prepend" in self._special_values:
prepends = self._special_values["_prepend"] or []
for prepend in prepends:
for (a, o) in self.getVarFlag(prepend, "_prepend") or []:
# maybe the OVERRIDE was not yet added so keep the prepend
if (o and o in overrides) or not o:
self.delVarFlag(prepend, "_prepend")
if o and not o in overrides:
continue
sval = a + (self.getVar(prepend, False) or "")
self.setVar(prepend, sval)
def initVar(self, var):
self.expand_cache = {}
if not var in self.dict:
self.dict[var] = {}
def _findVar(self, var):
dest = self.dict
while dest:
if var in dest:
return dest[var]
if "_data" not in dest:
break
dest = dest["_data"]
def _makeShadowCopy(self, var):
if var in self.dict:
return
local_var = self._findVar(var)
if local_var:
self.dict[var] = copy.copy(local_var)
else:
self.initVar(var)
def setVar(self, var, value):
self.expand_cache = {}
match = __setvar_regexp__.match(var)
if match and match.group("keyword") in __setvar_keyword__:
base = match.group('base')
keyword = match.group("keyword")
override = match.group('add')
l = self.getVarFlag(base, keyword) or []
l.append([value, override])
self.setVarFlag(base, keyword, l)
# todo make sure keyword is not __doc__ or __module__
# pay the cookie monster
try:
self._special_values[keyword].add( base )
except KeyError:
self._special_values[keyword] = set()
self._special_values[keyword].add( base )
return
if not var in self.dict:
self._makeShadowCopy(var)
# more cookies for the cookie monster
if '_' in var:
override = var[var.rfind('_')+1:]
if override not in self._seen_overrides:
self._seen_overrides[override] = set()
self._seen_overrides[override].add( var )
# setting var
self.dict[var]["content"] = value
def getVar(self, var, exp):
value = self.getVarFlag(var, "content")
if exp and value:
return self.expand(value, var)
return value
def renameVar(self, key, newkey):
"""
Rename the variable key to newkey
"""
val = self.getVar(key, 0)
if val is not None:
self.setVar(newkey, val)
for i in ('_append', '_prepend'):
src = self.getVarFlag(key, i)
if src is None:
continue
dest = self.getVarFlag(newkey, i) or []
dest.extend(src)
self.setVarFlag(newkey, i, dest)
if i in self._special_values and key in self._special_values[i]:
self._special_values[i].remove(key)
self._special_values[i].add(newkey)
self.delVar(key)
def delVar(self, var):
self.expand_cache = {}
self.dict[var] = {}
def setVarFlag(self, var, flag, flagvalue):
if not var in self.dict:
self._makeShadowCopy(var)
self.dict[var][flag] = flagvalue
def getVarFlag(self, var, flag):
local_var = self._findVar(var)
if local_var:
if flag in local_var:
return copy.copy(local_var[flag])
return None
def delVarFlag(self, var, flag):
local_var = self._findVar(var)
if not local_var:
return
if not var in self.dict:
self._makeShadowCopy(var)
if var in self.dict and flag in self.dict[var]:
del self.dict[var][flag]
def setVarFlags(self, var, flags):
if not var in self.dict:
self._makeShadowCopy(var)
for i in flags:
if i == "content":
continue
self.dict[var][i] = flags[i]
def getVarFlags(self, var):
local_var = self._findVar(var)
flags = {}
if local_var:
for i in local_var:
if i == "content":
continue
flags[i] = local_var[i]
if len(flags) == 0:
return None
return flags
def delVarFlags(self, var):
if not var in self.dict:
self._makeShadowCopy(var)
if var in self.dict:
content = None
# try to save the content
if "content" in self.dict[var]:
content = self.dict[var]["content"]
self.dict[var] = {}
self.dict[var]["content"] = content
else:
del self.dict[var]
def createCopy(self):
"""
Create a copy of self by setting _data to self
"""
# we really want this to be a DataSmart...
data = DataSmart(seen=self._seen_overrides.copy(), special=self._special_values.copy())
data.dict["_data"] = self.dict
return data
# Dictionary Methods
def keys(self):
def _keys(d, mykey):
if "_data" in d:
_keys(d["_data"], mykey)
for key in d.keys():
if key != "_data":
mykey[key] = None
keytab = {}
_keys(self.dict, keytab)
return keytab.keys()
def __getitem__(self, item):
#print "Warning deprecated"
return self.getVar(item, False)
def __setitem__(self, var, data):
#print "Warning deprecated"
self.setVar(var, data)