356 lines
12 KiB
Python
356 lines
12 KiB
Python
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from __future__ import annotations
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from collections.abc import Callable, Generator, Iterable, Mapping, MutableMapping
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from contextlib import contextmanager
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from typing import Any, Literal, overload
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from . import helpers, presets
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from .common import normalize_url, utils
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from .parser_block import ParserBlock
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from .parser_core import ParserCore
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from .parser_inline import ParserInline
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from .renderer import RendererHTML, RendererProtocol
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from .rules_core.state_core import StateCore
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from .token import Token
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from .utils import EnvType, OptionsDict, OptionsType, PresetType
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try:
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import linkify_it
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except ModuleNotFoundError:
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linkify_it = None
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_PRESETS: dict[str, PresetType] = {
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"default": presets.default.make(),
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"js-default": presets.js_default.make(),
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"zero": presets.zero.make(),
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"commonmark": presets.commonmark.make(),
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"gfm-like": presets.gfm_like.make(),
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}
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class MarkdownIt:
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def __init__(
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self,
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config: str | PresetType = "commonmark",
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options_update: Mapping[str, Any] | None = None,
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*,
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renderer_cls: Callable[[MarkdownIt], RendererProtocol] = RendererHTML,
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):
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"""Main parser class
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:param config: name of configuration to load or a pre-defined dictionary
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:param options_update: dictionary that will be merged into ``config["options"]``
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:param renderer_cls: the class to load as the renderer:
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``self.renderer = renderer_cls(self)
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"""
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# add modules
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self.utils = utils
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self.helpers = helpers
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# initialise classes
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self.inline = ParserInline()
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self.block = ParserBlock()
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self.core = ParserCore()
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self.renderer = renderer_cls(self)
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self.linkify = linkify_it.LinkifyIt() if linkify_it else None
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# set the configuration
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if options_update and not isinstance(options_update, Mapping):
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# catch signature change where renderer_cls was not used as a key-word
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raise TypeError(
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f"options_update should be a mapping: {options_update}"
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"\n(Perhaps you intended this to be the renderer_cls?)"
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)
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self.configure(config, options_update=options_update)
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def __repr__(self) -> str:
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return f"{self.__class__.__module__}.{self.__class__.__name__}()"
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@overload
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def __getitem__(self, name: Literal["inline"]) -> ParserInline:
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...
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@overload
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def __getitem__(self, name: Literal["block"]) -> ParserBlock:
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...
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@overload
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def __getitem__(self, name: Literal["core"]) -> ParserCore:
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...
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@overload
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def __getitem__(self, name: Literal["renderer"]) -> RendererProtocol:
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...
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@overload
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def __getitem__(self, name: str) -> Any:
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...
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def __getitem__(self, name: str) -> Any:
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return {
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"inline": self.inline,
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"block": self.block,
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"core": self.core,
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"renderer": self.renderer,
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}[name]
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def set(self, options: OptionsType) -> None:
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"""Set parser options (in the same format as in constructor).
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Probably, you will never need it, but you can change options after constructor call.
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__Note:__ To achieve the best possible performance, don't modify a
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`markdown-it` instance options on the fly. If you need multiple configurations
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it's best to create multiple instances and initialize each with separate config.
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"""
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self.options = OptionsDict(options)
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def configure(
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self, presets: str | PresetType, options_update: Mapping[str, Any] | None = None
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) -> MarkdownIt:
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"""Batch load of all options and component settings.
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This is an internal method, and you probably will not need it.
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But if you will - see available presets and data structure
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[here](https://github.com/markdown-it/markdown-it/tree/master/lib/presets)
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We strongly recommend to use presets instead of direct config loads.
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That will give better compatibility with next versions.
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"""
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if isinstance(presets, str):
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if presets not in _PRESETS:
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raise KeyError(f"Wrong `markdown-it` preset '{presets}', check name")
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config = _PRESETS[presets]
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else:
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config = presets
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if not config:
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raise ValueError("Wrong `markdown-it` config, can't be empty")
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options = config.get("options", {}) or {}
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if options_update:
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options = {**options, **options_update} # type: ignore
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self.set(options) # type: ignore
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if "components" in config:
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for name, component in config["components"].items():
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rules = component.get("rules", None)
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if rules:
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self[name].ruler.enableOnly(rules)
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rules2 = component.get("rules2", None)
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if rules2:
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self[name].ruler2.enableOnly(rules2)
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return self
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def get_all_rules(self) -> dict[str, list[str]]:
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"""Return the names of all active rules."""
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rules = {
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chain: self[chain].ruler.get_all_rules()
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for chain in ["core", "block", "inline"]
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}
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rules["inline2"] = self.inline.ruler2.get_all_rules()
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return rules
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def get_active_rules(self) -> dict[str, list[str]]:
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"""Return the names of all active rules."""
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rules = {
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chain: self[chain].ruler.get_active_rules()
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for chain in ["core", "block", "inline"]
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}
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rules["inline2"] = self.inline.ruler2.get_active_rules()
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return rules
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def enable(
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self, names: str | Iterable[str], ignoreInvalid: bool = False
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) -> MarkdownIt:
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"""Enable list or rules. (chainable)
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:param names: rule name or list of rule names to enable.
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:param ignoreInvalid: set `true` to ignore errors when rule not found.
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It will automatically find appropriate components,
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containing rules with given names. If rule not found, and `ignoreInvalid`
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not set - throws exception.
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Example::
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md = MarkdownIt().enable(['sub', 'sup']).disable('smartquotes')
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"""
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result = []
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if isinstance(names, str):
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names = [names]
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for chain in ["core", "block", "inline"]:
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result.extend(self[chain].ruler.enable(names, True))
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result.extend(self.inline.ruler2.enable(names, True))
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missed = [name for name in names if name not in result]
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if missed and not ignoreInvalid:
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raise ValueError(f"MarkdownIt. Failed to enable unknown rule(s): {missed}")
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return self
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def disable(
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self, names: str | Iterable[str], ignoreInvalid: bool = False
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) -> MarkdownIt:
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"""The same as [[MarkdownIt.enable]], but turn specified rules off. (chainable)
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:param names: rule name or list of rule names to disable.
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:param ignoreInvalid: set `true` to ignore errors when rule not found.
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"""
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result = []
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if isinstance(names, str):
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names = [names]
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for chain in ["core", "block", "inline"]:
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result.extend(self[chain].ruler.disable(names, True))
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result.extend(self.inline.ruler2.disable(names, True))
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missed = [name for name in names if name not in result]
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if missed and not ignoreInvalid:
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raise ValueError(f"MarkdownIt. Failed to disable unknown rule(s): {missed}")
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return self
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@contextmanager
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def reset_rules(self) -> Generator[None, None, None]:
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"""A context manager, that will reset the current enabled rules on exit."""
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chain_rules = self.get_active_rules()
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yield
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for chain, rules in chain_rules.items():
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if chain != "inline2":
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self[chain].ruler.enableOnly(rules)
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self.inline.ruler2.enableOnly(chain_rules["inline2"])
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def add_render_rule(
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self, name: str, function: Callable[..., Any], fmt: str = "html"
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) -> None:
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"""Add a rule for rendering a particular Token type.
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Only applied when ``renderer.__output__ == fmt``
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"""
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if self.renderer.__output__ == fmt:
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self.renderer.rules[name] = function.__get__(self.renderer) # type: ignore
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def use(
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self, plugin: Callable[..., None], *params: Any, **options: Any
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) -> MarkdownIt:
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"""Load specified plugin with given params into current parser instance. (chainable)
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It's just a sugar to call `plugin(md, params)` with curring.
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Example::
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def func(tokens, idx):
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tokens[idx].content = tokens[idx].content.replace('foo', 'bar')
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md = MarkdownIt().use(plugin, 'foo_replace', 'text', func)
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"""
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plugin(self, *params, **options)
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return self
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def parse(self, src: str, env: EnvType | None = None) -> list[Token]:
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"""Parse the source string to a token stream
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:param src: source string
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:param env: environment sandbox
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Parse input string and return list of block tokens (special token type
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"inline" will contain list of inline tokens).
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`env` is used to pass data between "distributed" rules and return additional
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metadata like reference info, needed for the renderer. It also can be used to
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inject data in specific cases. Usually, you will be ok to pass `{}`,
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and then pass updated object to renderer.
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"""
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env = {} if env is None else env
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if not isinstance(env, MutableMapping):
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raise TypeError(f"Input data should be a MutableMapping, not {type(env)}")
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if not isinstance(src, str):
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raise TypeError(f"Input data should be a string, not {type(src)}")
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state = StateCore(src, self, env)
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self.core.process(state)
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return state.tokens
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def render(self, src: str, env: EnvType | None = None) -> Any:
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"""Render markdown string into html. It does all magic for you :).
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:param src: source string
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:param env: environment sandbox
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:returns: The output of the loaded renderer
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`env` can be used to inject additional metadata (`{}` by default).
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But you will not need it with high probability. See also comment
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in [[MarkdownIt.parse]].
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"""
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env = {} if env is None else env
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return self.renderer.render(self.parse(src, env), self.options, env)
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def parseInline(self, src: str, env: EnvType | None = None) -> list[Token]:
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"""The same as [[MarkdownIt.parse]] but skip all block rules.
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:param src: source string
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:param env: environment sandbox
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It returns the
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block tokens list with the single `inline` element, containing parsed inline
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tokens in `children` property. Also updates `env` object.
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"""
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env = {} if env is None else env
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if not isinstance(env, MutableMapping):
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raise TypeError(f"Input data should be an MutableMapping, not {type(env)}")
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if not isinstance(src, str):
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raise TypeError(f"Input data should be a string, not {type(src)}")
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state = StateCore(src, self, env)
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state.inlineMode = True
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self.core.process(state)
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return state.tokens
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def renderInline(self, src: str, env: EnvType | None = None) -> Any:
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"""Similar to [[MarkdownIt.render]] but for single paragraph content.
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:param src: source string
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:param env: environment sandbox
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Similar to [[MarkdownIt.render]] but for single paragraph content. Result
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will NOT be wrapped into `<p>` tags.
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"""
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env = {} if env is None else env
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return self.renderer.render(self.parseInline(src, env), self.options, env)
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# link methods
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def validateLink(self, url: str) -> bool:
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"""Validate if the URL link is allowed in output.
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This validator can prohibit more than really needed to prevent XSS.
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It's a tradeoff to keep code simple and to be secure by default.
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Note: the url should be normalized at this point, and existing entities decoded.
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"""
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return normalize_url.validateLink(url)
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def normalizeLink(self, url: str) -> str:
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"""Normalize destination URLs in links
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::
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[label]: destination 'title'
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^^^^^^^^^^^
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"""
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return normalize_url.normalizeLink(url)
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def normalizeLinkText(self, link: str) -> str:
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"""Normalize autolink content
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::
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<destination>
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~~~~~~~~~~~
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"""
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return normalize_url.normalizeLinkText(link)
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