Adding upstream version 2.1.0.upstream/2.1.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 237 insertions, 0 deletions

diff --git a/markdown_it/ruler.py b/markdown_it/ruler.py
new file mode 100644
index 0000000..11b937a
--- /dev/null
+++ b/markdown_it/ruler.py
@@ -0,0 +1,237 @@
+"""
+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 Callable, Iterable, MutableMapping
+from dataclasses import dataclass, field
+from typing import TYPE_CHECKING
+
+from markdown_it._compat import DATACLASS_KWARGS
+
+if TYPE_CHECKING:
+    from markdown_it import MarkdownIt
+
+
+class StateBase:
+    srcCharCode: tuple[int, ...]
+
+    def __init__(self, src: str, md: MarkdownIt, env: MutableMapping):
+        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(ord(c) for c in self.src)
+
+
+# The first positional arg is always a subtype of `StateBase`. Other
+# arguments may or may not exist, based on the rule's type (block,
+# core, inline). Return type is either `None` or `bool` based on the
+# rule's type.
+RuleFunc = Callable
+
+
+@dataclass(**DATACLASS_KWARGS)
+class Rule:
+    name: str
+    enabled: bool
+    fn: RuleFunc = field(repr=False)
+    alt: list[str]
+
+
+class Ruler:
+    def __init__(self):
+        # List of added rules.
+        self.__rules__: list[Rule] = []
+        # Cached rule chains.
+        # First level - chain name, '' for default.
+        # Second level - diginal anchor for fast filtering by charcodes.
+        self.__cache__: dict[str, list[RuleFunc]] | 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: RuleFunc, options=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: RuleFunc, options=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(ruleName, True, fn, options.get("alt", [])))
+        self.__cache__ = None
+
+    def after(self, afterName: str, ruleName: str, fn: RuleFunc, options=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(ruleName, True, fn, options.get("alt", []))
+        )
+        self.__cache__ = None
+
+    def push(self, ruleName: str, fn: RuleFunc, options=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(ruleName, True, fn, (options or {}).get("alt", [])))
+        self.__cache__ = None
+
+    def enable(self, names: str | Iterable[str], ignoreInvalid: bool = False):
+        """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 = []
+        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):
+        """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
+        self.enable(names, ignoreInvalid)
+
+    def disable(self, names: str | Iterable[str], ignoreInvalid: bool = False):
+        """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[RuleFunc]:
+        """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]