918 lines
31 KiB
Python
918 lines
31 KiB
Python
from __future__ import annotations
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import ast
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import re
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import typing as t
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from dataclasses import dataclass
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from string import Template
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from types import CodeType
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from urllib.parse import quote
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from ..datastructures import iter_multi_items
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from ..urls import _urlencode
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from .converters import ValidationError
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if t.TYPE_CHECKING:
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from .converters import BaseConverter
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from .map import Map
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class Weighting(t.NamedTuple):
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number_static_weights: int
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static_weights: list[tuple[int, int]]
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number_argument_weights: int
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argument_weights: list[int]
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@dataclass
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class RulePart:
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"""A part of a rule.
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Rules can be represented by parts as delimited by `/` with
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instances of this class representing those parts. The *content* is
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either the raw content if *static* or a regex string to match
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against. The *weight* can be used to order parts when matching.
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"""
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content: str
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final: bool
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static: bool
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suffixed: bool
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weight: Weighting
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_part_re = re.compile(
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r"""
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(?:
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(?P<slash>/) # a slash
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(?P<static>[^</]+) # static rule data
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(?:
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<
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(?:
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(?P<converter>[a-zA-Z_][a-zA-Z0-9_]*) # converter name
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(?:\((?P<arguments>.*?)\))? # converter arguments
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: # variable delimiter
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)?
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(?P<variable>[a-zA-Z_][a-zA-Z0-9_]*) # variable name
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>
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)
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)
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""",
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re.VERBOSE,
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)
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_simple_rule_re = re.compile(r"<([^>]+)>")
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_converter_args_re = re.compile(
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r"""
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\s*
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((?P<name>\w+)\s*=\s*)?
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(?P<value>
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True|False|
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\d+.\d+|
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\d+.|
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\d+|
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[\w\d_.]+|
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[urUR]?(?P<stringval>"[^"]*?"|'[^']*')
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)\s*,
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""",
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re.VERBOSE,
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)
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_PYTHON_CONSTANTS = {"None": None, "True": True, "False": False}
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def _find(value: str, target: str, pos: int) -> int:
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"""Find the *target* in *value* after *pos*.
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Returns the *value* length if *target* isn't found.
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"""
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try:
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return value.index(target, pos)
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except ValueError:
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return len(value)
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def _pythonize(value: str) -> None | bool | int | float | str:
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if value in _PYTHON_CONSTANTS:
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return _PYTHON_CONSTANTS[value]
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for convert in int, float:
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try:
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return convert(value) # type: ignore
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except ValueError:
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pass
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if value[:1] == value[-1:] and value[0] in "\"'":
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value = value[1:-1]
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return str(value)
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def parse_converter_args(argstr: str) -> tuple[tuple[t.Any, ...], dict[str, t.Any]]:
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argstr += ","
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args = []
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kwargs = {}
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position = 0
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for item in _converter_args_re.finditer(argstr):
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if item.start() != position:
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raise ValueError(
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f"Cannot parse converter argument '{argstr[position:item.start()]}'"
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)
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value = item.group("stringval")
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if value is None:
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value = item.group("value")
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value = _pythonize(value)
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if not item.group("name"):
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args.append(value)
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else:
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name = item.group("name")
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kwargs[name] = value
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position = item.end()
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return tuple(args), kwargs
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class RuleFactory:
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"""As soon as you have more complex URL setups it's a good idea to use rule
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factories to avoid repetitive tasks. Some of them are builtin, others can
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be added by subclassing `RuleFactory` and overriding `get_rules`.
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"""
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def get_rules(self, map: Map) -> t.Iterable[Rule]:
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"""Subclasses of `RuleFactory` have to override this method and return
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an iterable of rules."""
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raise NotImplementedError()
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class Subdomain(RuleFactory):
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"""All URLs provided by this factory have the subdomain set to a
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specific domain. For example if you want to use the subdomain for
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the current language this can be a good setup::
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url_map = Map([
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Rule('/', endpoint='#select_language'),
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Subdomain('<string(length=2):lang_code>', [
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Rule('/', endpoint='index'),
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Rule('/about', endpoint='about'),
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Rule('/help', endpoint='help')
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])
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])
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All the rules except for the ``'#select_language'`` endpoint will now
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listen on a two letter long subdomain that holds the language code
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for the current request.
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"""
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def __init__(self, subdomain: str, rules: t.Iterable[RuleFactory]) -> None:
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self.subdomain = subdomain
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self.rules = rules
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def get_rules(self, map: Map) -> t.Iterator[Rule]:
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for rulefactory in self.rules:
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for rule in rulefactory.get_rules(map):
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rule = rule.empty()
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rule.subdomain = self.subdomain
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yield rule
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class Submount(RuleFactory):
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"""Like `Subdomain` but prefixes the URL rule with a given string::
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url_map = Map([
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Rule('/', endpoint='index'),
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Submount('/blog', [
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Rule('/', endpoint='blog/index'),
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Rule('/entry/<entry_slug>', endpoint='blog/show')
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])
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])
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Now the rule ``'blog/show'`` matches ``/blog/entry/<entry_slug>``.
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"""
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def __init__(self, path: str, rules: t.Iterable[RuleFactory]) -> None:
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self.path = path.rstrip("/")
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self.rules = rules
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def get_rules(self, map: Map) -> t.Iterator[Rule]:
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for rulefactory in self.rules:
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for rule in rulefactory.get_rules(map):
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rule = rule.empty()
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rule.rule = self.path + rule.rule
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yield rule
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class EndpointPrefix(RuleFactory):
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"""Prefixes all endpoints (which must be strings for this factory) with
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another string. This can be useful for sub applications::
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url_map = Map([
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Rule('/', endpoint='index'),
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EndpointPrefix('blog/', [Submount('/blog', [
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Rule('/', endpoint='index'),
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Rule('/entry/<entry_slug>', endpoint='show')
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])])
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])
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"""
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def __init__(self, prefix: str, rules: t.Iterable[RuleFactory]) -> None:
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self.prefix = prefix
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self.rules = rules
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def get_rules(self, map: Map) -> t.Iterator[Rule]:
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for rulefactory in self.rules:
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for rule in rulefactory.get_rules(map):
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rule = rule.empty()
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rule.endpoint = self.prefix + rule.endpoint
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yield rule
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class RuleTemplate:
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"""Returns copies of the rules wrapped and expands string templates in
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the endpoint, rule, defaults or subdomain sections.
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Here a small example for such a rule template::
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from werkzeug.routing import Map, Rule, RuleTemplate
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resource = RuleTemplate([
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Rule('/$name/', endpoint='$name.list'),
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Rule('/$name/<int:id>', endpoint='$name.show')
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])
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url_map = Map([resource(name='user'), resource(name='page')])
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When a rule template is called the keyword arguments are used to
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replace the placeholders in all the string parameters.
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"""
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def __init__(self, rules: t.Iterable[Rule]) -> None:
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self.rules = list(rules)
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def __call__(self, *args: t.Any, **kwargs: t.Any) -> RuleTemplateFactory:
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return RuleTemplateFactory(self.rules, dict(*args, **kwargs))
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class RuleTemplateFactory(RuleFactory):
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"""A factory that fills in template variables into rules. Used by
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`RuleTemplate` internally.
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:internal:
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"""
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def __init__(
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self, rules: t.Iterable[RuleFactory], context: dict[str, t.Any]
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) -> None:
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self.rules = rules
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self.context = context
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def get_rules(self, map: Map) -> t.Iterator[Rule]:
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for rulefactory in self.rules:
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for rule in rulefactory.get_rules(map):
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new_defaults = subdomain = None
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if rule.defaults:
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new_defaults = {}
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for key, value in rule.defaults.items():
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if isinstance(value, str):
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value = Template(value).substitute(self.context)
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new_defaults[key] = value
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if rule.subdomain is not None:
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subdomain = Template(rule.subdomain).substitute(self.context)
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new_endpoint = rule.endpoint
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if isinstance(new_endpoint, str):
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new_endpoint = Template(new_endpoint).substitute(self.context)
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yield Rule(
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Template(rule.rule).substitute(self.context),
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new_defaults,
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subdomain,
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rule.methods,
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rule.build_only,
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new_endpoint,
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rule.strict_slashes,
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)
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def _prefix_names(src: str) -> ast.stmt:
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"""ast parse and prefix names with `.` to avoid collision with user vars"""
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tree = ast.parse(src).body[0]
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if isinstance(tree, ast.Expr):
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tree = tree.value # type: ignore
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for node in ast.walk(tree):
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if isinstance(node, ast.Name):
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node.id = f".{node.id}"
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return tree
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_CALL_CONVERTER_CODE_FMT = "self._converters[{elem!r}].to_url()"
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_IF_KWARGS_URL_ENCODE_CODE = """\
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if kwargs:
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params = self._encode_query_vars(kwargs)
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q = "?" if params else ""
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else:
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q = params = ""
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"""
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_IF_KWARGS_URL_ENCODE_AST = _prefix_names(_IF_KWARGS_URL_ENCODE_CODE)
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_URL_ENCODE_AST_NAMES = (_prefix_names("q"), _prefix_names("params"))
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class Rule(RuleFactory):
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"""A Rule represents one URL pattern. There are some options for `Rule`
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that change the way it behaves and are passed to the `Rule` constructor.
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Note that besides the rule-string all arguments *must* be keyword arguments
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in order to not break the application on Werkzeug upgrades.
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`string`
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Rule strings basically are just normal URL paths with placeholders in
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the format ``<converter(arguments):name>`` where the converter and the
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arguments are optional. If no converter is defined the `default`
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converter is used which means `string` in the normal configuration.
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URL rules that end with a slash are branch URLs, others are leaves.
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If you have `strict_slashes` enabled (which is the default), all
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branch URLs that are matched without a trailing slash will trigger a
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redirect to the same URL with the missing slash appended.
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The converters are defined on the `Map`.
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`endpoint`
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The endpoint for this rule. This can be anything. A reference to a
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function, a string, a number etc. The preferred way is using a string
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because the endpoint is used for URL generation.
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`defaults`
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An optional dict with defaults for other rules with the same endpoint.
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This is a bit tricky but useful if you want to have unique URLs::
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url_map = Map([
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Rule('/all/', defaults={'page': 1}, endpoint='all_entries'),
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Rule('/all/page/<int:page>', endpoint='all_entries')
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])
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If a user now visits ``http://example.com/all/page/1`` they will be
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redirected to ``http://example.com/all/``. If `redirect_defaults` is
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disabled on the `Map` instance this will only affect the URL
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generation.
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`subdomain`
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The subdomain rule string for this rule. If not specified the rule
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only matches for the `default_subdomain` of the map. If the map is
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not bound to a subdomain this feature is disabled.
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Can be useful if you want to have user profiles on different subdomains
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and all subdomains are forwarded to your application::
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url_map = Map([
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Rule('/', subdomain='<username>', endpoint='user/homepage'),
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Rule('/stats', subdomain='<username>', endpoint='user/stats')
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])
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`methods`
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A sequence of http methods this rule applies to. If not specified, all
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methods are allowed. For example this can be useful if you want different
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endpoints for `POST` and `GET`. If methods are defined and the path
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matches but the method matched against is not in this list or in the
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list of another rule for that path the error raised is of the type
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`MethodNotAllowed` rather than `NotFound`. If `GET` is present in the
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list of methods and `HEAD` is not, `HEAD` is added automatically.
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`strict_slashes`
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Override the `Map` setting for `strict_slashes` only for this rule. If
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not specified the `Map` setting is used.
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`merge_slashes`
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Override :attr:`Map.merge_slashes` for this rule.
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`build_only`
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Set this to True and the rule will never match but will create a URL
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that can be build. This is useful if you have resources on a subdomain
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or folder that are not handled by the WSGI application (like static data)
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`redirect_to`
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If given this must be either a string or callable. In case of a
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callable it's called with the url adapter that triggered the match and
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the values of the URL as keyword arguments and has to return the target
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for the redirect, otherwise it has to be a string with placeholders in
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rule syntax::
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def foo_with_slug(adapter, id):
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# ask the database for the slug for the old id. this of
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# course has nothing to do with werkzeug.
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return f'foo/{Foo.get_slug_for_id(id)}'
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url_map = Map([
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Rule('/foo/<slug>', endpoint='foo'),
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Rule('/some/old/url/<slug>', redirect_to='foo/<slug>'),
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Rule('/other/old/url/<int:id>', redirect_to=foo_with_slug)
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])
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When the rule is matched the routing system will raise a
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`RequestRedirect` exception with the target for the redirect.
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Keep in mind that the URL will be joined against the URL root of the
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script so don't use a leading slash on the target URL unless you
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really mean root of that domain.
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`alias`
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If enabled this rule serves as an alias for another rule with the same
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endpoint and arguments.
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`host`
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If provided and the URL map has host matching enabled this can be
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used to provide a match rule for the whole host. This also means
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that the subdomain feature is disabled.
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`websocket`
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If ``True``, this rule is only matches for WebSocket (``ws://``,
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``wss://``) requests. By default, rules will only match for HTTP
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requests.
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.. versionchanged:: 2.1
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Percent-encoded newlines (``%0a``), which are decoded by WSGI
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servers, are considered when routing instead of terminating the
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match early.
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.. versionadded:: 1.0
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Added ``websocket``.
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.. versionadded:: 1.0
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Added ``merge_slashes``.
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.. versionadded:: 0.7
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Added ``alias`` and ``host``.
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.. versionchanged:: 0.6.1
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``HEAD`` is added to ``methods`` if ``GET`` is present.
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"""
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|
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def __init__(
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self,
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string: str,
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defaults: t.Mapping[str, t.Any] | None = None,
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subdomain: str | None = None,
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methods: t.Iterable[str] | None = None,
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build_only: bool = False,
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endpoint: str | None = None,
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strict_slashes: bool | None = None,
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merge_slashes: bool | None = None,
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redirect_to: str | t.Callable[..., str] | None = None,
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alias: bool = False,
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host: str | None = None,
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websocket: bool = False,
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) -> None:
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if not string.startswith("/"):
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raise ValueError(f"URL rule '{string}' must start with a slash.")
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self.rule = string
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self.is_leaf = not string.endswith("/")
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self.is_branch = string.endswith("/")
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self.map: Map = None # type: ignore
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self.strict_slashes = strict_slashes
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self.merge_slashes = merge_slashes
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self.subdomain = subdomain
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self.host = host
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self.defaults = defaults
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self.build_only = build_only
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self.alias = alias
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self.websocket = websocket
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if methods is not None:
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if isinstance(methods, str):
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raise TypeError("'methods' should be a list of strings.")
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methods = {x.upper() for x in methods}
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|
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if "HEAD" not in methods and "GET" in methods:
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methods.add("HEAD")
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if websocket and methods - {"GET", "HEAD", "OPTIONS"}:
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raise ValueError(
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"WebSocket rules can only use 'GET', 'HEAD', and 'OPTIONS' methods."
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)
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self.methods = methods
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self.endpoint: str = endpoint # type: ignore
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self.redirect_to = redirect_to
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if defaults:
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self.arguments = set(map(str, defaults))
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else:
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self.arguments = set()
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self._converters: dict[str, BaseConverter] = {}
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self._trace: list[tuple[bool, str]] = []
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self._parts: list[RulePart] = []
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def empty(self) -> Rule:
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"""
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|
Return an unbound copy of this rule.
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This can be useful if want to reuse an already bound URL for another
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map. See ``get_empty_kwargs`` to override what keyword arguments are
|
|
provided to the new copy.
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|
"""
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return type(self)(self.rule, **self.get_empty_kwargs())
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|
|
def get_empty_kwargs(self) -> t.Mapping[str, t.Any]:
|
|
"""
|
|
Provides kwargs for instantiating empty copy with empty()
|
|
|
|
Use this method to provide custom keyword arguments to the subclass of
|
|
``Rule`` when calling ``some_rule.empty()``. Helpful when the subclass
|
|
has custom keyword arguments that are needed at instantiation.
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|
|
Must return a ``dict`` that will be provided as kwargs to the new
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instance of ``Rule``, following the initial ``self.rule`` value which
|
|
is always provided as the first, required positional argument.
|
|
"""
|
|
defaults = None
|
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if self.defaults:
|
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defaults = dict(self.defaults)
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return dict(
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defaults=defaults,
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subdomain=self.subdomain,
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methods=self.methods,
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build_only=self.build_only,
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endpoint=self.endpoint,
|
|
strict_slashes=self.strict_slashes,
|
|
redirect_to=self.redirect_to,
|
|
alias=self.alias,
|
|
host=self.host,
|
|
)
|
|
|
|
def get_rules(self, map: Map) -> t.Iterator[Rule]:
|
|
yield self
|
|
|
|
def refresh(self) -> None:
|
|
"""Rebinds and refreshes the URL. Call this if you modified the
|
|
rule in place.
|
|
|
|
:internal:
|
|
"""
|
|
self.bind(self.map, rebind=True)
|
|
|
|
def bind(self, map: Map, rebind: bool = False) -> None:
|
|
"""Bind the url to a map and create a regular expression based on
|
|
the information from the rule itself and the defaults from the map.
|
|
|
|
:internal:
|
|
"""
|
|
if self.map is not None and not rebind:
|
|
raise RuntimeError(f"url rule {self!r} already bound to map {self.map!r}")
|
|
self.map = map
|
|
if self.strict_slashes is None:
|
|
self.strict_slashes = map.strict_slashes
|
|
if self.merge_slashes is None:
|
|
self.merge_slashes = map.merge_slashes
|
|
if self.subdomain is None:
|
|
self.subdomain = map.default_subdomain
|
|
self.compile()
|
|
|
|
def get_converter(
|
|
self,
|
|
variable_name: str,
|
|
converter_name: str,
|
|
args: tuple[t.Any, ...],
|
|
kwargs: t.Mapping[str, t.Any],
|
|
) -> BaseConverter:
|
|
"""Looks up the converter for the given parameter.
|
|
|
|
.. versionadded:: 0.9
|
|
"""
|
|
if converter_name not in self.map.converters:
|
|
raise LookupError(f"the converter {converter_name!r} does not exist")
|
|
return self.map.converters[converter_name](self.map, *args, **kwargs)
|
|
|
|
def _encode_query_vars(self, query_vars: t.Mapping[str, t.Any]) -> str:
|
|
items: t.Iterable[tuple[str, str]] = iter_multi_items(query_vars)
|
|
|
|
if self.map.sort_parameters:
|
|
items = sorted(items, key=self.map.sort_key)
|
|
|
|
return _urlencode(items)
|
|
|
|
def _parse_rule(self, rule: str) -> t.Iterable[RulePart]:
|
|
content = ""
|
|
static = True
|
|
argument_weights = []
|
|
static_weights: list[tuple[int, int]] = []
|
|
final = False
|
|
convertor_number = 0
|
|
|
|
pos = 0
|
|
while pos < len(rule):
|
|
match = _part_re.match(rule, pos)
|
|
if match is None:
|
|
raise ValueError(f"malformed url rule: {rule!r}")
|
|
|
|
data = match.groupdict()
|
|
if data["static"] is not None:
|
|
static_weights.append((len(static_weights), -len(data["static"])))
|
|
self._trace.append((False, data["static"]))
|
|
content += data["static"] if static else re.escape(data["static"])
|
|
|
|
if data["variable"] is not None:
|
|
if static:
|
|
# Switching content to represent regex, hence the need to escape
|
|
content = re.escape(content)
|
|
static = False
|
|
c_args, c_kwargs = parse_converter_args(data["arguments"] or "")
|
|
convobj = self.get_converter(
|
|
data["variable"], data["converter"] or "default", c_args, c_kwargs
|
|
)
|
|
self._converters[data["variable"]] = convobj
|
|
self.arguments.add(data["variable"])
|
|
if not convobj.part_isolating:
|
|
final = True
|
|
content += f"(?P<__werkzeug_{convertor_number}>{convobj.regex})"
|
|
convertor_number += 1
|
|
argument_weights.append(convobj.weight)
|
|
self._trace.append((True, data["variable"]))
|
|
|
|
if data["slash"] is not None:
|
|
self._trace.append((False, "/"))
|
|
if final:
|
|
content += "/"
|
|
else:
|
|
if not static:
|
|
content += r"\Z"
|
|
weight = Weighting(
|
|
-len(static_weights),
|
|
static_weights,
|
|
-len(argument_weights),
|
|
argument_weights,
|
|
)
|
|
yield RulePart(
|
|
content=content,
|
|
final=final,
|
|
static=static,
|
|
suffixed=False,
|
|
weight=weight,
|
|
)
|
|
content = ""
|
|
static = True
|
|
argument_weights = []
|
|
static_weights = []
|
|
final = False
|
|
convertor_number = 0
|
|
|
|
pos = match.end()
|
|
|
|
suffixed = False
|
|
if final and content[-1] == "/":
|
|
# If a converter is part_isolating=False (matches slashes) and ends with a
|
|
# slash, augment the regex to support slash redirects.
|
|
suffixed = True
|
|
content = content[:-1] + "(?<!/)(/?)"
|
|
if not static:
|
|
content += r"\Z"
|
|
weight = Weighting(
|
|
-len(static_weights),
|
|
static_weights,
|
|
-len(argument_weights),
|
|
argument_weights,
|
|
)
|
|
yield RulePart(
|
|
content=content,
|
|
final=final,
|
|
static=static,
|
|
suffixed=suffixed,
|
|
weight=weight,
|
|
)
|
|
if suffixed:
|
|
yield RulePart(
|
|
content="", final=False, static=True, suffixed=False, weight=weight
|
|
)
|
|
|
|
def compile(self) -> None:
|
|
"""Compiles the regular expression and stores it."""
|
|
assert self.map is not None, "rule not bound"
|
|
|
|
if self.map.host_matching:
|
|
domain_rule = self.host or ""
|
|
else:
|
|
domain_rule = self.subdomain or ""
|
|
self._parts = []
|
|
self._trace = []
|
|
self._converters = {}
|
|
if domain_rule == "":
|
|
self._parts = [
|
|
RulePart(
|
|
content="",
|
|
final=False,
|
|
static=True,
|
|
suffixed=False,
|
|
weight=Weighting(0, [], 0, []),
|
|
)
|
|
]
|
|
else:
|
|
self._parts.extend(self._parse_rule(domain_rule))
|
|
self._trace.append((False, "|"))
|
|
rule = self.rule
|
|
if self.merge_slashes:
|
|
rule = re.sub("/{2,}?", "/", self.rule)
|
|
self._parts.extend(self._parse_rule(rule))
|
|
|
|
self._build: t.Callable[..., tuple[str, str]]
|
|
self._build = self._compile_builder(False).__get__(self, None)
|
|
self._build_unknown: t.Callable[..., tuple[str, str]]
|
|
self._build_unknown = self._compile_builder(True).__get__(self, None)
|
|
|
|
@staticmethod
|
|
def _get_func_code(code: CodeType, name: str) -> t.Callable[..., tuple[str, str]]:
|
|
globs: dict[str, t.Any] = {}
|
|
locs: dict[str, t.Any] = {}
|
|
exec(code, globs, locs)
|
|
return locs[name] # type: ignore
|
|
|
|
def _compile_builder(
|
|
self, append_unknown: bool = True
|
|
) -> t.Callable[..., tuple[str, str]]:
|
|
defaults = self.defaults or {}
|
|
dom_ops: list[tuple[bool, str]] = []
|
|
url_ops: list[tuple[bool, str]] = []
|
|
|
|
opl = dom_ops
|
|
for is_dynamic, data in self._trace:
|
|
if data == "|" and opl is dom_ops:
|
|
opl = url_ops
|
|
continue
|
|
# this seems like a silly case to ever come up but:
|
|
# if a default is given for a value that appears in the rule,
|
|
# resolve it to a constant ahead of time
|
|
if is_dynamic and data in defaults:
|
|
data = self._converters[data].to_url(defaults[data])
|
|
opl.append((False, data))
|
|
elif not is_dynamic:
|
|
# safe = https://url.spec.whatwg.org/#url-path-segment-string
|
|
opl.append((False, quote(data, safe="!$&'()*+,/:;=@")))
|
|
else:
|
|
opl.append((True, data))
|
|
|
|
def _convert(elem: str) -> ast.stmt:
|
|
ret = _prefix_names(_CALL_CONVERTER_CODE_FMT.format(elem=elem))
|
|
ret.args = [ast.Name(str(elem), ast.Load())] # type: ignore # str for py2
|
|
return ret
|
|
|
|
def _parts(ops: list[tuple[bool, str]]) -> list[ast.AST]:
|
|
parts = [
|
|
_convert(elem) if is_dynamic else ast.Constant(elem)
|
|
for is_dynamic, elem in ops
|
|
]
|
|
parts = parts or [ast.Constant("")]
|
|
# constant fold
|
|
ret = [parts[0]]
|
|
for p in parts[1:]:
|
|
if isinstance(p, ast.Constant) and isinstance(ret[-1], ast.Constant):
|
|
ret[-1] = ast.Constant(ret[-1].value + p.value)
|
|
else:
|
|
ret.append(p)
|
|
return ret
|
|
|
|
dom_parts = _parts(dom_ops)
|
|
url_parts = _parts(url_ops)
|
|
if not append_unknown:
|
|
body = []
|
|
else:
|
|
body = [_IF_KWARGS_URL_ENCODE_AST]
|
|
url_parts.extend(_URL_ENCODE_AST_NAMES)
|
|
|
|
def _join(parts: list[ast.AST]) -> ast.AST:
|
|
if len(parts) == 1: # shortcut
|
|
return parts[0]
|
|
return ast.JoinedStr(parts)
|
|
|
|
body.append(
|
|
ast.Return(ast.Tuple([_join(dom_parts), _join(url_parts)], ast.Load()))
|
|
)
|
|
|
|
pargs = [
|
|
elem
|
|
for is_dynamic, elem in dom_ops + url_ops
|
|
if is_dynamic and elem not in defaults
|
|
]
|
|
kargs = [str(k) for k in defaults]
|
|
|
|
func_ast: ast.FunctionDef = _prefix_names("def _(): pass") # type: ignore
|
|
func_ast.name = f"<builder:{self.rule!r}>"
|
|
func_ast.args.args.append(ast.arg(".self", None))
|
|
for arg in pargs + kargs:
|
|
func_ast.args.args.append(ast.arg(arg, None))
|
|
func_ast.args.kwarg = ast.arg(".kwargs", None)
|
|
for _ in kargs:
|
|
func_ast.args.defaults.append(ast.Constant(""))
|
|
func_ast.body = body
|
|
|
|
# Use `ast.parse` instead of `ast.Module` for better portability, since the
|
|
# signature of `ast.Module` can change.
|
|
module = ast.parse("")
|
|
module.body = [func_ast]
|
|
|
|
# mark everything as on line 1, offset 0
|
|
# less error-prone than `ast.fix_missing_locations`
|
|
# bad line numbers cause an assert to fail in debug builds
|
|
for node in ast.walk(module):
|
|
if "lineno" in node._attributes:
|
|
node.lineno = 1
|
|
if "end_lineno" in node._attributes:
|
|
node.end_lineno = node.lineno
|
|
if "col_offset" in node._attributes:
|
|
node.col_offset = 0
|
|
if "end_col_offset" in node._attributes:
|
|
node.end_col_offset = node.col_offset
|
|
|
|
code = compile(module, "<werkzeug routing>", "exec")
|
|
return self._get_func_code(code, func_ast.name)
|
|
|
|
def build(
|
|
self, values: t.Mapping[str, t.Any], append_unknown: bool = True
|
|
) -> tuple[str, str] | None:
|
|
"""Assembles the relative url for that rule and the subdomain.
|
|
If building doesn't work for some reasons `None` is returned.
|
|
|
|
:internal:
|
|
"""
|
|
try:
|
|
if append_unknown:
|
|
return self._build_unknown(**values)
|
|
else:
|
|
return self._build(**values)
|
|
except ValidationError:
|
|
return None
|
|
|
|
def provides_defaults_for(self, rule: Rule) -> bool:
|
|
"""Check if this rule has defaults for a given rule.
|
|
|
|
:internal:
|
|
"""
|
|
return bool(
|
|
not self.build_only
|
|
and self.defaults
|
|
and self.endpoint == rule.endpoint
|
|
and self != rule
|
|
and self.arguments == rule.arguments
|
|
)
|
|
|
|
def suitable_for(
|
|
self, values: t.Mapping[str, t.Any], method: str | None = None
|
|
) -> bool:
|
|
"""Check if the dict of values has enough data for url generation.
|
|
|
|
:internal:
|
|
"""
|
|
# if a method was given explicitly and that method is not supported
|
|
# by this rule, this rule is not suitable.
|
|
if (
|
|
method is not None
|
|
and self.methods is not None
|
|
and method not in self.methods
|
|
):
|
|
return False
|
|
|
|
defaults = self.defaults or ()
|
|
|
|
# all arguments required must be either in the defaults dict or
|
|
# the value dictionary otherwise it's not suitable
|
|
for key in self.arguments:
|
|
if key not in defaults and key not in values:
|
|
return False
|
|
|
|
# in case defaults are given we ensure that either the value was
|
|
# skipped or the value is the same as the default value.
|
|
if defaults:
|
|
for key, value in defaults.items():
|
|
if key in values and value != values[key]:
|
|
return False
|
|
|
|
return True
|
|
|
|
def build_compare_key(self) -> tuple[int, int, int]:
|
|
"""The build compare key for sorting.
|
|
|
|
:internal:
|
|
"""
|
|
return (1 if self.alias else 0, -len(self.arguments), -len(self.defaults or ()))
|
|
|
|
def __eq__(self, other: object) -> bool:
|
|
return isinstance(other, type(self)) and self._trace == other._trace
|
|
|
|
__hash__ = None # type: ignore
|
|
|
|
def __str__(self) -> str:
|
|
return self.rule
|
|
|
|
def __repr__(self) -> str:
|
|
if self.map is None:
|
|
return f"<{type(self).__name__} (unbound)>"
|
|
parts = []
|
|
for is_dynamic, data in self._trace:
|
|
if is_dynamic:
|
|
parts.append(f"<{data}>")
|
|
else:
|
|
parts.append(data)
|
|
parts = "".join(parts).lstrip("|")
|
|
methods = f" ({', '.join(self.methods)})" if self.methods is not None else ""
|
|
return f"<{type(self).__name__} {parts!r}{methods} -> {self.endpoint}>"
|