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import refrom collections import defaultdict
class AccountingExpressionProcessor(object): """ Processor for accounting expressions.
Expressions of the form <field><mode>[accounts][optional move line domain] are supported, where: * field is bal, crd, deb * mode is i (initial balance), e (ending balance), p (moves over period) * accounts is a list of accounts, possibly containing % wildcards * an optional domain on analytic lines allowing filters on eg analytic accounts or journal
Examples: * bal[70]: balance of moves on account 70 over the period (it is the same as balp[70]); * bali[70,60]: initial balance of accounts 70 and 60; * bale[1%]: balance of accounts starting with 1 at end of period.
How to use: * repeatedly invoke parse_expr() for each expression containing accounting variables as described above; this let the processor group domains and modes and accounts; * when all expressions have been parsed, invoke done_parsing() to notify the processor that he can prepare to query (mainly search all accounts - children, consolidation - that will need to be queried; * for each period, call do_queries(), the call replace_expr() for each expression to replace accounting variables with their resulting value for the given period.
How it works: * by accumulating the expressions before hand, it ensure to do the strict minimum number of queries to the database (for each period, one query per domain and mode); * it queries using the orm read_group which reduces to a query with sum on debit and credit and group by on account_id (note: it seems the orm then does one query per account to fetch the account name...); * additionally, one query per view/consolidation account is done to discover the children accounts. """
ACC_RE = re.compile(r"(?P<field>\bbal|\bcrd|\bdeb)" r"(?P<mode>[pise])?" r"(?P<accounts>_[0-9]+|\[.*?\])" r"(?P<domain>\[.*?\])?")
def __init__(self, env): self.env = env self._map = defaultdict(set) # {(domain, mode): set(account_ids)} self._account_ids_by_code = defaultdict(set)
def _load_account_codes(self, account_codes, account_domain): account_model = self.env['account.account'] # TODO: account_obj is necessary because _get_children_and_consol # does not work in new API? account_obj = self.env.registry('account.account') exact_codes = set() like_codes = set() for account_code in account_codes: if account_code in self._account_ids_by_code: continue if '%' in account_code: like_codes.add(account_code) else: exact_codes.add(account_code) for account in account_model.\ search([('code', 'in', list(exact_codes))] + account_domain): if account.type in ('view', 'consolidation'): self._account_ids_by_code[account.code].update( account_obj._get_children_and_consol( self.env.cr, self.env.uid, [account.id], self.env.context)) else: self._account_ids_by_code[account.code].add(account.id) for like_code in like_codes: for account in account_model.\ search([('code', 'like', like_code)] + account_domain): if account.type in ('view', 'consolidation'): self._account_ids_by_code[like_code].update( account_obj._get_children_and_consol( self.env.cr, self.env.uid, [account.id], self.env.context)) else: self._account_ids_by_code[like_code].add(account.id)
def _parse_mo(self, mo): """Split a match object corresponding to an accounting variable
Returns field, mode, [account codes], [domain expression]. """
field, mode, account_codes, domain = mo.groups() if not mode: mode = 'p' elif mode == 's': mode = 'e' if account_codes.startswith('_'): account_codes = account_codes[1:] else: account_codes = account_codes[1:-1] account_codes = [a.strip() for a in account_codes.split(',')] domain = domain or '[]' domain = tuple(eval(domain)) # TODO: safe_eval return field, mode, account_codes, domain
def parse_expr(self, expr): """Parse an expression, extracting accounting variables.
Domains and accounts are extracted and stored in the map so when all expressions have been parsed, we know what to query. """
for mo in self.ACC_RE.finditer(expr): field, mode, account_codes, domain = self._parse_mo(mo) key = (domain, mode) self._map[key].update(account_codes)
def done_parsing(self, account_domain): # load account codes and replace account codes by account ids in _map for key, account_codes in self._map.items(): self._load_account_codes(account_codes, account_domain) account_ids = set() for account_code in account_codes: account_ids.update(self._account_ids_by_code[account_code]) self._map[key] = list(account_ids)
def do_queries(self, period_domain, period_domain_i, period_domain_e): aml_model = self.env['account.move.line'] self._data = {} # {(domain, mode): {account_id: (debit, credit)}} for key in self._map: self._data[key] = {} domain, mode = key if mode == 'p': domain = list(domain) + period_domain elif mode == 'i': domain = list(domain) + period_domain_i elif mode == 'e': domain = list(domain) + period_domain_e else: raise RuntimeError("unexpected mode %s" % (mode,)) domain = [('account_id', 'in', self._map[key])] + domain accs = aml_model.read_group(domain, ['debit', 'credit', 'account_id'], ['account_id']) for acc in accs: self._data[key][acc['account_id'][0]] = \ (acc['debit'], acc['credit'])
def replace_expr(self, expr): """Replace accounting variables in an expression by their amount.
Returns a new expression.
This method must be executed after do_queries(). """
def f(mo): field, mode, account_codes, domain = self._parse_mo(mo) key = (domain, mode) account_ids_data = self._data[key] v = 0.0 for account_code in account_codes: for account_id in self._account_ids_by_code[account_code]: debit, credit = account_ids_data.get(account_id, (0.0, 0.0)) if field == 'deb': v += debit elif field == 'crd': v += credit elif field == 'bal': v += debit - credit return '(' + repr(v) + ')' return self.ACC_RE.sub(f, expr)
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