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112 lines
3.8 KiB
112 lines
3.8 KiB
2 weeks ago
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"""Block-level tokenizer."""
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from __future__ import annotations
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import logging
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from typing import TYPE_CHECKING, Callable
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from . import rules_block
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from .ruler import Ruler
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from .rules_block.state_block import StateBlock
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from .token import Token
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from .utils import EnvType
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if TYPE_CHECKING:
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from markdown_it import MarkdownIt
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LOGGER = logging.getLogger(__name__)
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RuleFuncBlockType = Callable[[StateBlock, int, int, bool], bool]
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"""(state: StateBlock, startLine: int, endLine: int, silent: bool) -> matched: bool)
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`silent` disables token generation, useful for lookahead.
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"""
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_rules: list[tuple[str, RuleFuncBlockType, list[str]]] = [
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# First 2 params - rule name & source. Secondary array - list of rules,
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# which can be terminated by this one.
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("table", rules_block.table, ["paragraph", "reference"]),
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("code", rules_block.code, []),
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("fence", rules_block.fence, ["paragraph", "reference", "blockquote", "list"]),
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(
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"blockquote",
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rules_block.blockquote,
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["paragraph", "reference", "blockquote", "list"],
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),
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("hr", rules_block.hr, ["paragraph", "reference", "blockquote", "list"]),
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("list", rules_block.list_block, ["paragraph", "reference", "blockquote"]),
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("reference", rules_block.reference, []),
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("html_block", rules_block.html_block, ["paragraph", "reference", "blockquote"]),
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("heading", rules_block.heading, ["paragraph", "reference", "blockquote"]),
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("lheading", rules_block.lheading, []),
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("paragraph", rules_block.paragraph, []),
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]
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class ParserBlock:
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"""
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ParserBlock#ruler -> Ruler
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[[Ruler]] instance. Keep configuration of block rules.
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"""
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def __init__(self) -> None:
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self.ruler = Ruler[RuleFuncBlockType]()
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for name, rule, alt in _rules:
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self.ruler.push(name, rule, {"alt": alt})
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def tokenize(self, state: StateBlock, startLine: int, endLine: int) -> None:
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"""Generate tokens for input range."""
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rules = self.ruler.getRules("")
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line = startLine
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maxNesting = state.md.options.maxNesting
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hasEmptyLines = False
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while line < endLine:
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state.line = line = state.skipEmptyLines(line)
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if line >= endLine:
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break
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if state.sCount[line] < state.blkIndent:
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# Termination condition for nested calls.
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# Nested calls currently used for blockquotes & lists
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break
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if state.level >= maxNesting:
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# If nesting level exceeded - skip tail to the end.
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# That's not ordinary situation and we should not care about content.
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state.line = endLine
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break
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# Try all possible rules.
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# On success, rule should:
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# - update `state.line`
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# - update `state.tokens`
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# - return True
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for rule in rules:
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if rule(state, line, endLine, False):
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break
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# set state.tight if we had an empty line before current tag
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# i.e. latest empty line should not count
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state.tight = not hasEmptyLines
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line = state.line
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# paragraph might "eat" one newline after it in nested lists
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if (line - 1) < endLine and state.isEmpty(line - 1):
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hasEmptyLines = True
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if line < endLine and state.isEmpty(line):
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hasEmptyLines = True
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line += 1
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state.line = line
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def parse(
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self, src: str, md: MarkdownIt, env: EnvType, outTokens: list[Token]
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) -> list[Token] | None:
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"""Process input string and push block tokens into `outTokens`."""
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if not src:
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return None
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state = StateBlock(src, md, env, outTokens)
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self.tokenize(state, state.line, state.lineMax)
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return state.tokens
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