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from pathlib import Path
from typing import Dict, Union, Generic, TypeVar, Optional
from json import loads
from re import compile
from bs4 import BeautifulSoup
from requests import Session
T = TypeVar('T')
class Reference(Generic[T]):
"""Represents a reference to something which may not exist yet."""
def __init__(self, initial_value: Optional[T] = None):
self._value = initial_value
@property
def value(self) -> Optional[T]:
return self._value
@value.setter
def value(self, new_value: T):
self._value = new_value
class Element:
"""An element is something that has a selector property with other optional properties that refine that selection"""
def __init__(self, name: str, data: Dict[str, str]):
self.name = name
self.selector = data['selector'] # I want this to error
self.regex = None
self.attribute = None
if 'regex' in data:
self.regex = compile(data['regex'])
elif 'attribute' in data:
self.attribute = data['attribute']
def process(self, soup: BeautifulSoup) -> str:
selection = soup.select_one(self.selector)
if self.attribute is not None:
# TODO: this is fragile; fix
try:
text = selection[self.attribute]
except TypeError: # NoneType
text = ''
else:
try:
text = selection.text
except AttributeError: # NoneType
text = ''
if self.regex is not None:
# TODO: this is fragile; fix
try:
return self.regex.search(text).group(1)
except AttributeError: # NoneType
return ''
else:
return text
def __repr__(self):
return f'<Element:{self.name}>'
class Container:
"""A container contains multiple elements or even other containers"""
def __init__(self, name: str, soup_ref: Reference[BeautifulSoup] = Reference()):
self.name = name
self.entries = {}
self.soup_ref = soup_ref
self.selector_root = None
def add(self, name: str, data: Union['Container', Element]):
# TODO: raise error on overwriting key
self.entries[name] = data
def __getattr__(self, name):
if name in self.entries:
entry = self.entries[name]
if isinstance(entry, Element):
return entry.process(self.soup_ref.value)
return self.entries[name]
def __iter__(self):
def internal_iterator():
for entry in self.entries:
yield entry
return internal_iterator()
def to_json(self):
json = {self.name: {}}
for entry in self.entries.values():
if isinstance(entry, Element):
json[self.name].update({entry.name: entry.process(self.soup_ref.value)})
else: # container
json[self.name].update({entry.name: entry.to_json()})
return json
def set_selector_root(self, root):
self.selector_root = root
def contains(self):
"""returns a list of everything this container contains"""
return self.entries.keys()
def __dir__(self):
return self.entries.keys()
def __repr__(self):
return f'<Container:{self.name}>'
class Definition:
"""Takes in a json definition file and stores its name/definition"""
def __init__(self, path: Union[str, Path], fmt_url: str, *, session: Optional[Session] = Session()):
if isinstance(path, str):
path = Path(path)
if path.suffix != '.json':
raise Exception('something is wrong.. why is this loading a non-json file?')
self.fmt_url = fmt_url
self.name = path.stem
self.tree = Container(self.name)
self.session = session
with open(path.expanduser()) as f:
json_data = loads(f.read())
self._build_tree(json_data, self.tree)
def _build_tree(self, json_data, root: Container):
for k, v in json_data.items():
if 'selector' in v:
# we're making an element to add to our container
root.add(k.lower(), Element(
k.lower(),
v
))
else:
# build a new Container and recurse
c = Container(k.lower())
# if 'ROOT' in k:
# selector_root = k['ROOT']['selector']
self._build_tree(v, root=c)
root.add(k.lower(), c)
def process(self, vars: Dict[str, str]):
response = self.session.get(
self.fmt_url % vars
)
response.raise_for_status()
with open(self.name + '.html', 'w', encoding='utf-8') as f:
f.write(response.text)
self.tree.soup_ref.value = BeautifulSoup(response.text, features="html.parser")
def to_json(self):
return self.tree.to_json()
def __getattr__(self, name):
return getattr(self.tree, name)
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