307 lines
13 KiB
Python
307 lines
13 KiB
Python
import re
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import string
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import unicodedata
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from django.core.cache import caches
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from cookbook.models import Unit, Food, Automation, Ingredient
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class IngredientParser:
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request = None
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ignore_rules = False
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food_aliases = {}
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unit_aliases = {}
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def __init__(self, request, cache_mode, ignore_automations=False):
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"""
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Initialize ingredient parser
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:param request: request context (to control caching, rule ownership, etc.)
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:param cache_mode: defines if all rules should be loaded on initialization (good when parser is used many times) or if they should be retrieved every time (good when parser is not used many times in a row)
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:param ignore_automations: ignore automation rules, allows to use ingredient parser without database access/request (request can be None)
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"""
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self.request = request
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self.ignore_rules = ignore_automations
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if cache_mode:
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FOOD_CACHE_KEY = f'automation_food_alias_{self.request.space.pk}'
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if c := caches['default'].get(FOOD_CACHE_KEY, None):
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self.food_aliases = c
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caches['default'].touch(FOOD_CACHE_KEY, 30)
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else:
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for a in Automation.objects.filter(space=self.request.space, disabled=False, type=Automation.FOOD_ALIAS).only('param_1', 'param_2').all():
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self.food_aliases[a.param_1] = a.param_2
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caches['default'].set(FOOD_CACHE_KEY, self.food_aliases, 30)
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UNIT_CACHE_KEY = f'automation_unit_alias_{self.request.space.pk}'
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if c := caches['default'].get(UNIT_CACHE_KEY, None):
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self.unit_aliases = c
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caches['default'].touch(UNIT_CACHE_KEY, 30)
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else:
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for a in Automation.objects.filter(space=self.request.space, disabled=False, type=Automation.UNIT_ALIAS).only('param_1', 'param_2').all():
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self.unit_aliases[a.param_1] = a.param_2
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caches['default'].set(UNIT_CACHE_KEY, self.unit_aliases, 30)
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else:
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self.food_aliases = {}
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self.unit_aliases = {}
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def apply_food_automation(self, food):
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"""
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Apply food alias automations to passed food
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:param food: unit as string
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:return: food as string (possibly changed by automation)
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"""
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if self.ignore_rules:
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return food
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else:
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if self.food_aliases:
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try:
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return self.food_aliases[food]
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except KeyError:
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return food
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else:
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if automation := Automation.objects.filter(space=self.request.space, type=Automation.FOOD_ALIAS, param_1=food, disabled=False).first():
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return automation.param_2
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return food
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def apply_unit_automation(self, unit):
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"""
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Apply unit alias automations to passed unit
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:param unit: unit as string
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:return: unit as string (possibly changed by automation)
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"""
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if self.ignore_rules:
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return unit
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else:
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if self.unit_aliases:
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try:
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return self.unit_aliases[unit]
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except KeyError:
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return unit
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else:
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if automation := Automation.objects.filter(space=self.request.space, type=Automation.UNIT_ALIAS, param_1=unit, disabled=False).first():
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return automation.param_2
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return unit
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def get_unit(self, unit):
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"""
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Get or create a unit for given space respecting possible automations
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:param unit: string unit
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:return: None if unit passed is invalid, Unit object otherwise
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"""
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if not unit:
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return None
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if len(unit) > 0:
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u, created = Unit.objects.get_or_create(name=self.apply_unit_automation(unit), space=self.request.space)
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return u
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return None
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def get_food(self, food):
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"""
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Get or create a food for given space respecting possible automations
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:param food: string food
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:return: None if food passed is invalid, Food object otherwise
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"""
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if not food:
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return None
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if len(food) > 0:
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f, created = Food.objects.get_or_create(name=self.apply_food_automation(food), space=self.request.space)
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return f
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return None
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def parse_fraction(self, x):
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if len(x) == 1 and 'fraction' in unicodedata.decomposition(x):
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frac_split = unicodedata.decomposition(x[-1:]).split()
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return (float((frac_split[1]).replace('003', ''))
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/ float((frac_split[3]).replace('003', '')))
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else:
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frac_split = x.split('/')
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if not len(frac_split) == 2:
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raise ValueError
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try:
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return int(frac_split[0]) / int(frac_split[1])
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except ZeroDivisionError:
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raise ValueError
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def parse_amount(self, x):
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amount = 0
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unit = None
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note = ''
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did_check_frac = False
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end = 0
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while (end < len(x) and (x[end] in string.digits
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or (
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(x[end] == '.' or x[end] == ',' or x[end] == '/')
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and end + 1 < len(x)
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and x[end + 1] in string.digits
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))):
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end += 1
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if end > 0:
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if "/" in x[:end]:
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amount = self.parse_fraction(x[:end])
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else:
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amount = float(x[:end].replace(',', '.'))
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else:
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amount = self.parse_fraction(x[0])
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end += 1
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did_check_frac = True
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if end < len(x):
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if did_check_frac:
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unit = x[end:]
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else:
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try:
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amount += self.parse_fraction(x[end])
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unit = x[end + 1:]
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except ValueError:
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unit = x[end:]
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if unit is not None and unit.strip() == '':
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unit = None
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if unit is not None and (unit.startswith('(') or unit.startswith('-')): # i dont know any unit that starts with ( or - so its likely an alternative like 1L (500ml) Water or 2-3
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unit = None
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note = x
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return amount, unit, note
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def parse_food_with_comma(self, tokens):
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food = ''
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note = ''
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start = 0
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# search for first occurrence of an argument ending in a comma
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while start < len(tokens) and not tokens[start].endswith(','):
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start += 1
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if start == len(tokens):
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# no token ending in a comma found -> use everything as food
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food = ' '.join(tokens)
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else:
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food = ' '.join(tokens[:start + 1])[:-1]
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note = ' '.join(tokens[start + 1:])
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return food, note
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def parse_food(self, tokens):
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food = ''
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note = ''
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if tokens[-1].endswith(')'):
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# Check if the matching opening bracket is in the same token
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if (not tokens[-1].startswith('(')) and ('(' in tokens[-1]):
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return self.parse_food_with_comma(tokens)
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# last argument ends with closing bracket -> look for opening bracket
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start = len(tokens) - 1
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while not tokens[start].startswith('(') and not start == 0:
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start -= 1
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if start == 0:
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# the whole list is wrapped in brackets -> assume it is an error (e.g. assumed first argument was the unit) # noqa: E501
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raise ValueError
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elif start < 0:
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# no opening bracket anywhere -> just ignore the last bracket
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food, note = self.parse_food_with_comma(tokens)
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else:
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# opening bracket found -> split in food and note, remove brackets from note # noqa: E501
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note = ' '.join(tokens[start:])[1:-1]
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food = ' '.join(tokens[:start])
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else:
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food, note = self.parse_food_with_comma(tokens)
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return food, note
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def parse(self, ingredient):
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"""
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Main parsing function, takes an ingredient string (e.g. '1 l Water') and extracts amount, unit, food, ...
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:param ingredient: string ingredient
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:return: amount, unit (can be None), food, note (can be empty)
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"""
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# initialize default values
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amount = 0
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unit = None
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food = ''
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note = ''
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unit_note = ''
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if len(ingredient) == 0:
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raise ValueError('string to parse cannot be empty')
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# some people/languages put amount and unit at the end of the ingredient string
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# if something like this is detected move it to the beginning so the parser can handle it
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if re.search(r'^([A-z])+(.)*[1-9](\d)*\s([A-z])+', ingredient):
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match = re.search(r'[1-9](\d)*\s([A-z])+', ingredient)
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print(f'reording from {ingredient} to {ingredient[match.start():match.end()] + " " + ingredient.replace(ingredient[match.start():match.end()], "")}')
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ingredient = ingredient[match.start():match.end()] + ' ' + ingredient.replace(ingredient[match.start():match.end()], '')
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# if the string contains parenthesis early on remove it and place it at the end
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# because its likely some kind of note
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if re.match('(.){1,6}\s\((.[^\(\)])+\)\s', ingredient):
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match = re.search('\((.[^\(])+\)', ingredient)
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ingredient = ingredient[:match.start()] + ingredient[match.end():] + ' ' + ingredient[match.start():match.end()]
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tokens = ingredient.split() # split at each space into tokens
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if len(tokens) == 1:
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# there only is one argument, that must be the food
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food = tokens[0]
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else:
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try:
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# try to parse first argument as amount
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amount, unit, unit_note = self.parse_amount(tokens[0])
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# only try to parse second argument as amount if there are at least
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# three arguments if it already has a unit there can't be
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# a fraction for the amount
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if len(tokens) > 2:
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try:
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if unit is not None:
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# a unit is already found, no need to try the second argument for a fraction
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# probably not the best method to do it, but I didn't want to make an if check and paste the exact same thing in the else as already is in the except
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raise ValueError
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# try to parse second argument as amount and add that, in case of '2 1/2' or '2 ½'
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amount += self.parse_fraction(tokens[1])
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# assume that units can't end with a comma
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if len(tokens) > 3 and not tokens[2].endswith(','):
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# try to use third argument as unit and everything else as food, use everything as food if it fails
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try:
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food, note = self.parse_food(tokens[3:])
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unit = tokens[2]
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except ValueError:
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food, note = self.parse_food(tokens[2:])
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else:
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food, note = self.parse_food(tokens[2:])
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except ValueError:
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# assume that units can't end with a comma
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if not tokens[1].endswith(','):
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# try to use second argument as unit and everything else as food, use everything as food if it fails
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try:
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food, note = self.parse_food(tokens[2:])
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if unit is None:
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unit = tokens[1]
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else:
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note = tokens[1]
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except ValueError:
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food, note = self.parse_food(tokens[1:])
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else:
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food, note = self.parse_food(tokens[1:])
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else:
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# only two arguments, first one is the amount
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# which means this is the food
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food = tokens[1]
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except ValueError:
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try:
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# can't parse first argument as amount
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# -> no unit -> parse everything as food
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food, note = self.parse_food(tokens)
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except ValueError:
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food = ' '.join(tokens[1:])
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if unit_note not in note:
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note += ' ' + unit_note
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if unit:
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unit = self.apply_unit_automation(unit.strip())
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food = self.apply_food_automation(food.strip())
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if len(food) > Food._meta.get_field('name').max_length: # test if food name is to long
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# try splitting it at a space and taking only the first arg
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if len(food.split()) > 1 and len(food.split()[0]) < Food._meta.get_field('name').max_length:
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note = ' '.join(food.split()[1:]) + ' ' + note
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food = food.split()[0]
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else:
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note = food + ' ' + note
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food = food[:Food._meta.get_field('name').max_length]
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return amount, unit, food, note[:Ingredient._meta.get_field('note').max_length].strip()
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