231 lines
7.4 KiB
Python
231 lines
7.4 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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from datetime import datetime
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import unicodedata
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from sqlalchemy.sql import operators
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from sqlalchemy.orm import load_only
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import utils
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import settings
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import logging
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logger = logging.getLogger(__name__)
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def get_operator(op, type='str'):
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return {
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'str': {
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'==': operators.eq,
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'>': operators.gt,
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'>=': operators.ge,
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'<': operators.lt,
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'<=': operators.le,
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'^': operators.startswith_op,
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'$': operators.endswith_op,
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},
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'int': {
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'==': operators.eq,
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'>': operators.gt,
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'>=': operators.ge,
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'<': operators.lt,
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'<=': operators.le,
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}
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}[type].get(op, {
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'str': operators.contains_op,
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'int': operators.eq
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}[type])
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class Parser(object):
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def __init__(self, model, user_items, find, sort):
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self._model = model
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self._find = find
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self._sort = sort
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self._user = model.users.mapper.class_
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self._user_items = user_items
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self._list = model.lists.mapper.class_
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self.item_keys = model.item_keys
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self.filter_keys = model.filter_keys
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def parse_condition(self, condition):
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'''
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condition: {
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value: "war"
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}
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or
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condition: {
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key: "year",
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value: [1970, 1980],
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operator: "="
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}
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...
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'''
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#logger.debug('parse_condition %s', condition)
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if not 'value' in condition:
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return None
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k = condition.get('key', '*')
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if not k:
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k = '*'
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v = condition['value']
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op = condition.get('operator')
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if not op:
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op = '='
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if op.startswith('!'):
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op = op[1:]
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exclude = True
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else:
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exclude = False
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key_type = (utils.get_by_id(self.item_keys, k) or {'type': 'string'}).get('type')
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if isinstance(key_type, list):
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key_type = key_type[0]
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if k == 'list':
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key_type = ''
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if (not exclude and op == '=' or op in ('$', '^')) and v == '':
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return None
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elif k == 'resolution':
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q = self.parse_condition({'key': 'width', 'value': v[0], 'operator': op}) \
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& self.parse_condition({'key': 'height', 'value': v[1], 'operator': op})
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if exclude:
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q = ~q
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return q
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elif isinstance(v, list) and len(v) == 2 and op == '=':
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q = self.parse_condition({'key': k, 'value': v[0], 'operator': '>='}) \
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& self.parse_condition({'key': k, 'value': v[1], 'operator': '<'})
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if exclude:
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q = ~q
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return q
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elif key_type == 'boolean':
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v = str(v).lower()
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v = v == 'true'
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vk = getattr(self._sort, k)
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q = operators.eq(vk, v)
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ids = self._model.query.join(self._sort).filter(q).options(load_only('id'))
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in_op = operators.notin_op if exclude else operators.in_op
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q = in_op(self._model.id, ids)
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return q
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elif key_type in ("string", "text"):
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if isinstance(v, str):
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v = unicodedata.normalize('NFKD', v).lower()
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else:
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v = v.lower()
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q = get_operator(op)(self._find.findvalue, v)
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if k != '*':
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q &= (self._find.key == k)
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ids = self._model.query.join(self._find).filter(q).options(load_only('id'))
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in_op = operators.notin_op if exclude else operators.in_op
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q = in_op(self._model.id, ids)
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return q
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elif k == 'list':
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nickname, name = v.split(':', 1)
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if nickname:
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u = self._user.query.filter_by(nickname=nickname).one()
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else:
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u = self._user.query.filter_by(id=settings.USER_ID).one()
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if nickname:
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peer = utils.get_peer(u.id)
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if name:
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ids = peer.info['lists'].get(name, [])
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else:
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ids = list(peer.library.keys())
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else:
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l = self._list.query.filter_by(user_id=u.id, name=name).one()
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ids = l.get_items().options(load_only('id'))
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in_op = operators.notin_op if exclude else operators.in_op
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q = in_op(self._model.id, ids)
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return q
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elif key_type == 'date':
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def parse_date(d):
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while len(d) < 3:
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d.append(1)
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return datetime(*[int(i) for i in d])
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#using sort here since find only contains strings
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v = parse_date(v.split('-'))
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vk = getattr(self._sort, k)
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q = get_operator(op, 'int')(vk, v)
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ids = self._model.query.join(self._find).filter(q).options(load_only('id'))
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in_op = operators.notin_op if exclude else operators.in_op
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q = in_op(self._model.id, ids)
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return q
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else: #integer, float, time
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q = get_operator(op, 'int')(getattr(self._sort, k), v)
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ids = self._model.query.join(self._find).filter(q).options(load_only('id'))
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in_op = operators.notin_op if exclude else operators.in_op
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q = in_op(self._model.id, ids)
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return q
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def parse_conditions(self, conditions, operator):
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'''
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conditions: [
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{
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value: "war"
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}
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{
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key: "year",
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value: "1970-1980,
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operator: "!="
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},
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{
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key: "country",
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value: "f",
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operator: "^"
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}
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],
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operator: "&"
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'''
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conn = []
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for condition in conditions:
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if 'conditions' in condition:
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q = self.parse_conditions(condition['conditions'],
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condition.get('operator', '&'))
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else:
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q = self.parse_condition(condition)
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if isinstance(q, list):
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conn += q
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else:
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conn.append(q)
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conn = [q for q in conn if not isinstance(q, None.__class__)]
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if conn:
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if operator == '|':
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q = conn[0]
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for c in conn[1:]:
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q = q | c
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q = [q]
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else:
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q = conn
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return q
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return []
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def find(self, data):
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'''
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query: {
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conditions: [
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{
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value: "war"
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}
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{
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key: "year",
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value: "1970-1980,
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operator: "!="
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},
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{
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key: "country",
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value: "f",
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operator: "^"
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}
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],
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operator: "&"
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}
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'''
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#join query with operator
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qs = self._model.query
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#only include items that have hard metadata
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conditions = self.parse_conditions(data.get('query', {}).get('conditions', []),
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data.get('query', {}).get('operator', '&'))
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for c in conditions:
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qs = qs.filter(c)
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#print(qs)
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return qs
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