# 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, os, re, sys, time, types
import bb
from bb   import utils, methodpool
from COW  import COWDictBase
from sets import Set
from new  import classobj


__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 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 expand(self,s, varname):
        def var_sub(match):
            key = match.group()[2:-1]
            if varname and key:
                if varname == key:
                    raise Exception("variable %s references itself!" % varname)
            var = self.getVar(key, 1)
            if var is not None:
                return var
            else:
                return match.group()

        def python_sub(match):
            import bb
            code = match.group()[3:-1]
            locals()['d'] = self
            s = eval(code)
            if type(s) == types.IntType: s = str(s)
            return s

        if type(s) is not types.StringType: # sanity check
            return s

        if varname and varname in self.expand_cache:
            return self.expand_cache[varname]

        while s.find('${') != -1:
            olds = s
            try:
                s = __expand_var_regexp__.sub(var_sub, s)
                s = __expand_python_regexp__.sub(python_sub, s)
                if s == olds: break
                if type(s) is not types.StringType: # sanity check
                    bb.msg.error(bb.msg.domain.Data, 'expansion of %s returned non-string %s' % (olds, s))
            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

        if varname:
            self.expand_cache[varname] = s

        return s

    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 and var not in _dest):
            if not "_data" in _dest:
                _dest = None
                break
            _dest = _dest["_data"]

        if _dest and var in _dest:
            return _dest[var]
        return None

    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:
                self._special_values[keyword] = Set()
                self._special_values[keyword].add( base )

            return

        if not var in self.dict:
            self._makeShadowCopy(var)
        if self.getVarFlag(var, 'matchesenv'):
            self.delVarFlag(var, 'matchesenv')
            self.setVarFlag(var, 'export', 1)

        # more cookies for the cookie monster
        if '_' in var:
            override = var[var.rfind('_')+1:]
            if not self._seen_overrides.has_key(override):
                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 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.keys():
            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 self.dict[var].keys():
                if i == "content":
                    continue
                flags[i] = self.dict[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)