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ruler.py
""" class Ruler Helper class, used by [[MarkdownIt#core]], [[MarkdownIt#block]] and [[MarkdownIt#inline]] to manage sequences of functions (rules): - keep rules in defined order - assign the name to each rule - enable/disable rules - add/replace rules - allow assign rules to additional named chains (in the same) - caching lists of active rules You will not need use this class directly until write plugins. For simple rules control use [[MarkdownIt.disable]], [[MarkdownIt.enable]] and [[MarkdownIt.use]]. """ from __future__ import annotations from collections.abc import Iterable from dataclasses import dataclass, field from typing import TYPE_CHECKING, Generic, TypedDict, TypeVar import warnings from markdown_it._compat import DATACLASS_KWARGS from .utils import EnvType if TYPE_CHECKING: from markdown_it import MarkdownIt class StateBase: def __init__(self, src: str, md: MarkdownIt, env: EnvType): self.src = src self.env = env self.md = md @property def src(self) -> str: return self._src @src.setter def src(self, value: str) -> None: self._src = value self._srcCharCode: tuple[int, ...] | None = None @property def srcCharCode(self) -> tuple[int, ...]: warnings.warn( "StateBase.srcCharCode is deprecated. Use StateBase.src instead.", DeprecationWarning, stacklevel=2, ) if self._srcCharCode is None: self._srcCharCode = tuple(ord(c) for c in self._src) return self._srcCharCode class RuleOptionsType(TypedDict, total=False): alt: list[str] RuleFuncTv = TypeVar("RuleFuncTv") """A rule function, whose signature is dependent on the state type.""" @dataclass(**DATACLASS_KWARGS) class Rule(Generic[RuleFuncTv]): name: str enabled: bool fn: RuleFuncTv = field(repr=False) alt: list[str] class Ruler(Generic[RuleFuncTv]): def __init__(self) -> None: # List of added rules. self.__rules__: list[Rule[RuleFuncTv]] = [] # Cached rule chains. # First level - chain name, '' for default. # Second level - diginal anchor for fast filtering by charcodes. self.__cache__: dict[str, list[RuleFuncTv]] | None = None def __find__(self, name: str) -> int: """Find rule index by name""" for i, rule in enumerate(self.__rules__): if rule.name == name: return i return -1 def __compile__(self) -> None: """Build rules lookup cache""" chains = {""} # collect unique names for rule in self.__rules__: if not rule.enabled: continue for name in rule.alt: chains.add(name) self.__cache__ = {} for chain in chains: self.__cache__[chain] = [] for rule in self.__rules__: if not rule.enabled: continue if chain and (chain not in rule.alt): continue self.__cache__[chain].append(rule.fn) def at( self, ruleName: str, fn: RuleFuncTv, options: RuleOptionsType | None = None ) -> None: """Replace rule by name with new function & options. :param ruleName: rule name to replace. :param fn: new rule function. :param options: new rule options (not mandatory). :raises: KeyError if name not found """ index = self.__find__(ruleName) options = options or {} if index == -1: raise KeyError(f"Parser rule not found: {ruleName}") self.__rules__[index].fn = fn self.__rules__[index].alt = options.get("alt", []) self.__cache__ = None def before( self, beforeName: str, ruleName: str, fn: RuleFuncTv, options: RuleOptionsType | None = None, ) -> None: """Add new rule to chain before one with given name. :param beforeName: new rule will be added before this one. :param ruleName: new rule will be added before this one. :param fn: new rule function. :param options: new rule options (not mandatory). :raises: KeyError if name not found """ index = self.__find__(beforeName) options = options or {} if index == -1: raise KeyError(f"Parser rule not found: {beforeName}") self.__rules__.insert( index, Rule[RuleFuncTv](ruleName, True, fn, options.get("alt", [])) ) self.__cache__ = None def after( self, afterName: str, ruleName: str, fn: RuleFuncTv, options: RuleOptionsType | None = None, ) -> None: """Add new rule to chain after one with given name. :param afterName: new rule will be added after this one. :param ruleName: new rule will be added after this one. :param fn: new rule function. :param options: new rule options (not mandatory). :raises: KeyError if name not found """ index = self.__find__(afterName) options = options or {} if index == -1: raise KeyError(f"Parser rule not found: {afterName}") self.__rules__.insert( index + 1, Rule[RuleFuncTv](ruleName, True, fn, options.get("alt", [])) ) self.__cache__ = None def push( self, ruleName: str, fn: RuleFuncTv, options: RuleOptionsType | None = None ) -> None: """Push new rule to the end of chain. :param ruleName: new rule will be added to the end of chain. :param fn: new rule function. :param options: new rule options (not mandatory). """ self.__rules__.append( Rule[RuleFuncTv](ruleName, True, fn, (options or {}).get("alt", [])) ) self.__cache__ = None def enable( self, names: str | Iterable[str], ignoreInvalid: bool = False ) -> list[str]: """Enable rules with given names. :param names: name or list of rule names to enable. :param ignoreInvalid: ignore errors when rule not found :raises: KeyError if name not found and not ignoreInvalid :return: list of found rule names """ if isinstance(names, str): names = [names] result: list[str] = [] for name in names: idx = self.__find__(name) if (idx < 0) and ignoreInvalid: continue if (idx < 0) and not ignoreInvalid: raise KeyError(f"Rules manager: invalid rule name {name}") self.__rules__[idx].enabled = True result.append(name) self.__cache__ = None return result def enableOnly( self, names: str | Iterable[str], ignoreInvalid: bool = False ) -> list[str]: """Enable rules with given names, and disable everything else. :param names: name or list of rule names to enable. :param ignoreInvalid: ignore errors when rule not found :raises: KeyError if name not found and not ignoreInvalid :return: list of found rule names """ if isinstance(names, str): names = [names] for rule in self.__rules__: rule.enabled = False return self.enable(names, ignoreInvalid) def disable( self, names: str | Iterable[str], ignoreInvalid: bool = False ) -> list[str]: """Disable rules with given names. :param names: name or list of rule names to enable. :param ignoreInvalid: ignore errors when rule not found :raises: KeyError if name not found and not ignoreInvalid :return: list of found rule names """ if isinstance(names, str): names = [names] result = [] for name in names: idx = self.__find__(name) if (idx < 0) and ignoreInvalid: continue if (idx < 0) and not ignoreInvalid: raise KeyError(f"Rules manager: invalid rule name {name}") self.__rules__[idx].enabled = False result.append(name) self.__cache__ = None return result def getRules(self, chainName: str = "") -> list[RuleFuncTv]: """Return array of active functions (rules) for given chain name. It analyzes rules configuration, compiles caches if not exists and returns result. Default chain name is `''` (empty string). It can't be skipped. That's done intentionally, to keep signature monomorphic for high speed. """ if self.__cache__ is None: self.__compile__() assert self.__cache__ is not None # Chain can be empty, if rules disabled. But we still have to return Array. return self.__cache__.get(chainName, []) or [] def get_all_rules(self) -> list[str]: """Return all available rule names.""" return [r.name for r in self.__rules__] def get_active_rules(self) -> list[str]: """Return the active rule names.""" return [r.name for r in self.__rules__ if r.enabled]
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