Varia's website
https://varia.zone
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
112 lines
3.8 KiB
112 lines
3.8 KiB
1 week ago
|
"""Block-level tokenizer."""
|
||
|
|
from __future__ import annotations
|
||
|
|
|
||
|
|
import logging
|
||
|
|
from typing import TYPE_CHECKING, Callable
|
||
|
|
|
||
|
|
from . import rules_block
|
||
|
|
from .ruler import Ruler
|
||
|
|
from .rules_block.state_block import StateBlock
|
||
|
|
from .token import Token
|
||
|
|
from .utils import EnvType
|
||
|
|
|
||
|
|
if TYPE_CHECKING:
|
||
|
|
from markdown_it import MarkdownIt
|
||
|
|
|
||
|
|
LOGGER = logging.getLogger(__name__)
|
||
|
|
|
||
|
|
|
||
|
|
RuleFuncBlockType = Callable[[StateBlock, int, int, bool], bool]
|
||
|
|
"""(state: StateBlock, startLine: int, endLine: int, silent: bool) -> matched: bool)
|
||
|
|
|
||
|
|
`silent` disables token generation, useful for lookahead.
|
||
|
|
"""
|
||
|
|
|
||
|
|
_rules: list[tuple[str, RuleFuncBlockType, list[str]]] = [
|
||
|
|
# First 2 params - rule name & source. Secondary array - list of rules,
|
||
|
|
# which can be terminated by this one.
|
||
|
|
("table", rules_block.table, ["paragraph", "reference"]),
|
||
|
|
("code", rules_block.code, []),
|
||
|
|
("fence", rules_block.fence, ["paragraph", "reference", "blockquote", "list"]),
|
||
|
|
(
|
||
|
|
"blockquote",
|
||
|
|
rules_block.blockquote,
|
||
|
|
["paragraph", "reference", "blockquote", "list"],
|
||
|
|
),
|
||
|
|
("hr", rules_block.hr, ["paragraph", "reference", "blockquote", "list"]),
|
||
|
|
("list", rules_block.list_block, ["paragraph", "reference", "blockquote"]),
|
||
|
|
("reference", rules_block.reference, []),
|
||
|
|
("html_block", rules_block.html_block, ["paragraph", "reference", "blockquote"]),
|
||
|
|
("heading", rules_block.heading, ["paragraph", "reference", "blockquote"]),
|
||
|
|
("lheading", rules_block.lheading, []),
|
||
|
|
("paragraph", rules_block.paragraph, []),
|
||
|
|
]
|
||
|
|
|
||
|
|
|
||
|
|
class ParserBlock:
|
||
|
|
"""
|
||
|
|
ParserBlock#ruler -> Ruler
|
||
|
|
|
||
|
|
[[Ruler]] instance. Keep configuration of block rules.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self) -> None:
|
||
|
|
self.ruler = Ruler[RuleFuncBlockType]()
|
||
|
|
for name, rule, alt in _rules:
|
||
|
|
self.ruler.push(name, rule, {"alt": alt})
|
||
|
|
|
||
|
|
def tokenize(self, state: StateBlock, startLine: int, endLine: int) -> None:
|
||
|
|
"""Generate tokens for input range."""
|
||
|
|
rules = self.ruler.getRules("")
|
||
|
|
line = startLine
|
||
|
|
maxNesting = state.md.options.maxNesting
|
||
|
|
hasEmptyLines = False
|
||
|
|
|
||
|
|
while line < endLine:
|
||
|
|
state.line = line = state.skipEmptyLines(line)
|
||
|
|
if line >= endLine:
|
||
|
|
break
|
||
|
|
if state.sCount[line] < state.blkIndent:
|
||
|
|
# Termination condition for nested calls.
|
||
|
|
# Nested calls currently used for blockquotes & lists
|
||
|
|
break
|
||
|
|
if state.level >= maxNesting:
|
||
|
|
# If nesting level exceeded - skip tail to the end.
|
||
|
|
# That's not ordinary situation and we should not care about content.
|
||
|
|
state.line = endLine
|
||
|
|
break
|
||
|
|
|
||
|
|
# Try all possible rules.
|
||
|
|
# On success, rule should:
|
||
|
|
# - update `state.line`
|
||
|
|
# - update `state.tokens`
|
||
|
|
# - return True
|
||
|
|
for rule in rules:
|
||
|
|
if rule(state, line, endLine, False):
|
||
|
|
break
|
||
|
|
|
||
|
|
# set state.tight if we had an empty line before current tag
|
||
|
|
# i.e. latest empty line should not count
|
||
|
|
state.tight = not hasEmptyLines
|
||
|
|
|
||
|
|
line = state.line
|
||
|
|
|
||
|
|
# paragraph might "eat" one newline after it in nested lists
|
||
|
|
if (line - 1) < endLine and state.isEmpty(line - 1):
|
||
|
|
hasEmptyLines = True
|
||
|
|
|
||
|
|
if line < endLine and state.isEmpty(line):
|
||
|
|
hasEmptyLines = True
|
||
|
|
line += 1
|
||
|
|
state.line = line
|
||
|
|
|
||
|
|
def parse(
|
||
|
|
self, src: str, md: MarkdownIt, env: EnvType, outTokens: list[Token]
|
||
|
|
) -> list[Token] | None:
|
||
|
|
"""Process input string and push block tokens into `outTokens`."""
|
||
|
|
if not src:
|
||
|
|
return None
|
||
|
|
state = StateBlock(src, md, env, outTokens)
|
||
|
|
self.tokenize(state, state.line, state.lineMax)
|
||
|
|
return state.tokens
|