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state_inline.py
from __future__ import annotations from collections import namedtuple from dataclasses import dataclass from typing import TYPE_CHECKING, Any, Literal from .._compat import DATACLASS_KWARGS from ..common.utils import isMdAsciiPunct, isPunctChar, isWhiteSpace from ..ruler import StateBase from ..token import Token from ..utils import EnvType if TYPE_CHECKING: from markdown_it import MarkdownIt @dataclass(**DATACLASS_KWARGS) class Delimiter: # Char code of the starting marker (number). marker: int # Total length of these series of delimiters. length: int # A position of the token this delimiter corresponds to. token: int # If this delimiter is matched as a valid opener, `end` will be # equal to its position, otherwise it's `-1`. end: int # Boolean flags that determine if this delimiter could open or close # an emphasis. open: bool close: bool level: bool | None = None Scanned = namedtuple("Scanned", ["can_open", "can_close", "length"]) class StateInline(StateBase): def __init__( self, src: str, md: MarkdownIt, env: EnvType, outTokens: list[Token] ) -> None: self.src = src self.env = env self.md = md self.tokens = outTokens self.tokens_meta: list[dict[str, Any] | None] = [None] * len(outTokens) self.pos = 0 self.posMax = len(self.src) self.level = 0 self.pending = "" self.pendingLevel = 0 # Stores { start: end } pairs. Useful for backtrack # optimization of pairs parse (emphasis, strikes). self.cache: dict[int, int] = {} # List of emphasis-like delimiters for current tag self.delimiters: list[Delimiter] = [] # Stack of delimiter lists for upper level tags self._prev_delimiters: list[list[Delimiter]] = [] # backticklength => last seen position self.backticks: dict[int, int] = {} self.backticksScanned = False # Counter used to disable inline linkify-it execution # inside <a> and markdown links self.linkLevel = 0 def __repr__(self) -> str: return ( f"{self.__class__.__name__}" f"(pos=[{self.pos} of {self.posMax}], token={len(self.tokens)})" ) def pushPending(self) -> Token: token = Token("text", "", 0) token.content = self.pending token.level = self.pendingLevel self.tokens.append(token) self.pending = "" return token def push(self, ttype: str, tag: str, nesting: Literal[-1, 0, 1]) -> Token: """Push new token to "stream". If pending text exists - flush it as text token """ if self.pending: self.pushPending() token = Token(ttype, tag, nesting) token_meta = None if nesting < 0: # closing tag self.level -= 1 self.delimiters = self._prev_delimiters.pop() token.level = self.level if nesting > 0: # opening tag self.level += 1 self._prev_delimiters.append(self.delimiters) self.delimiters = [] token_meta = {"delimiters": self.delimiters} self.pendingLevel = self.level self.tokens.append(token) self.tokens_meta.append(token_meta) return token def scanDelims(self, start: int, canSplitWord: bool) -> Scanned: """ Scan a sequence of emphasis-like markers, and determine whether it can start an emphasis sequence or end an emphasis sequence. - start - position to scan from (it should point at a valid marker); - canSplitWord - determine if these markers can be found inside a word """ pos = start maximum = self.posMax marker = self.src[start] # treat beginning of the line as a whitespace lastChar = self.src[start - 1] if start > 0 else " " while pos < maximum and self.src[pos] == marker: pos += 1 count = pos - start # treat end of the line as a whitespace nextChar = self.src[pos] if pos < maximum else " " isLastPunctChar = isMdAsciiPunct(ord(lastChar)) or isPunctChar(lastChar) isNextPunctChar = isMdAsciiPunct(ord(nextChar)) or isPunctChar(nextChar) isLastWhiteSpace = isWhiteSpace(ord(lastChar)) isNextWhiteSpace = isWhiteSpace(ord(nextChar)) left_flanking = not ( isNextWhiteSpace or (isNextPunctChar and not (isLastWhiteSpace or isLastPunctChar)) ) right_flanking = not ( isLastWhiteSpace or (isLastPunctChar and not (isNextWhiteSpace or isNextPunctChar)) ) if not canSplitWord: can_open = left_flanking and ((not right_flanking) or isLastPunctChar) can_close = right_flanking and ((not left_flanking) or isNextPunctChar) else: can_open = left_flanking can_close = right_flanking return Scanned(can_open, can_close, count)
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