128 lines
3.9 KiB
Python
128 lines
3.9 KiB
Python
#!/usr/bin/env python3
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from glob import glob
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from os import path
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import itertools
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from copy import deepcopy
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from typing import Iterable, List, Union, Tuple
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from tatsu import parse as tatsu_parse
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from tatsu.ast import AST
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from tatsu.exceptions import SemanticError
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from .models import Location, Choice, Option, Dish
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from utils import first
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# TODO Use proper way to get resources, see https://stackoverflow.com/a/10935674
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with open(path.join(path.dirname(__file__), "hlds.tatsu")) as fh:
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GRAMMAR = fh.read()
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def filter_instance(cls, iterable):
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return [item for item in iterable if isinstance(item, cls)]
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# pylint: disable=no-self-use
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class HldsSemanticActions:
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def location(self, ast) -> Location:
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choices = {choice.id: choice for choice in filter_instance(Choice, ast["items_"])}
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dishes = filter_instance(Dish, ast["items_"])
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for dish in dishes:
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for i, choice in enumerate(dish.choices):
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if not isinstance(choice[1], Choice):
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dish.choices[i] = (dish.choices[i][0], deepcopy(choices[choice[1]]))
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# Move the base price to the first single choice if there is any
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first_single_choice = first(c[1] for c in dish.choices if c[0] == "single_choice")
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if dish.price and first_single_choice:
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for option in first_single_choice.options:
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option.price += dish.price
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dish.price = 0
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attributes = {att["key"]: att["value"] for att in ast["attributes"]}
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return Location(
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ast["id"],
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name=ast["name"],
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dishes=dishes,
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osm=attributes.get("osm"),
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address=attributes.get("address"),
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telephone=attributes.get("phone"),
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website=attributes.get("website"),
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)
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def dish_block(self, ast) -> Dish:
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return Dish(
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ast["id"],
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name=ast["name"],
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description=ast["description"],
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price=ast["price"] or 0,
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tags=ast["tags"] or [],
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choices=ast["choices"],
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)
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def choice_block(self, ast) -> Choice:
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if ast["price"] or ast["tags"]:
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raise SemanticError("Choice blocks cannot have price or tags, put them on each of its options instead")
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return Choice(
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ast["id"],
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name=ast["name"],
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description=ast["description"],
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options=ast["entries"],
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)
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def indent_choice_block(self, ast) -> Tuple[str, Union[Choice, AST]]:
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return (
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(ast["type"], self.choice_block(ast))
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if ast["kind"] == "declaration" else
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(ast["type"], ast["id"])
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)
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def indent_choice_entry(self, ast) -> Option:
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return Option(
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ast["id"],
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name=ast["name"],
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description=ast["description"],
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price=ast["price"] or 0,
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tags=ast["tags"] or [],
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)
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noindent_choice_entry = indent_choice_entry
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def price(self, ast) -> int:
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return (
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100 * int(ast["value_unit"]) +
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(
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0 if not ast["value_cents"] else
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10 * int(ast["value_cents"]) if len(ast["value_cents"]) == 1 else
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int(ast["value_cents"])
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)
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)
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def _default(self, ast):
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return ast
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SEMANTICS = HldsSemanticActions()
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def parse(menu: str) -> List[Location]:
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parsed = tatsu_parse(GRAMMAR, menu, semantics=SEMANTICS)
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return parsed
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def parse_file(filename: str) -> List[Location]:
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with open(filename, "r") as file_handle:
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return parse(file_handle.read())
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def parse_files(files: Iterable[str]) -> List[Location]:
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menus = map(parse_file, files)
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return list(itertools.chain.from_iterable(menus))
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def parse_all_directory(directory: str) -> List[Location]:
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# TODO Use proper way to get resources, see https://stackoverflow.com/a/10935674
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files = glob(path.join(directory, "**.hlds"), recursive=True)
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return parse_files(files)
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