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✏️ Editing: fence.py

# fences (``` lang, ~~~ lang)
import logging

from .state_block import StateBlock

LOGGER = logging.getLogger(__name__)

def fence(state: StateBlock, startLine: int, endLine: int, silent: bool) -> bool:
    LOGGER.debug("entering fence: %s, %s, %s, %s", state, startLine, endLine, silent)

haveEndMarker = False
    pos = state.bMarks[startLine] + state.tShift[startLine]
    maximum = state.eMarks[startLine]

if state.is_code_block(startLine):
        return False

if pos + 3 > maximum:
        return False

marker = state.src[pos]

if marker not in ("~", "`"):
        return False

# scan marker length
    mem = pos
    pos = state.skipCharsStr(pos, marker)

length = pos - mem

if length < 3:
        return False

markup = state.src[mem:pos]
    params = state.src[pos:maximum]

if marker == "`" and marker in params:
        return False

# Since start is found, we can report success here in validation mode
    if silent:
        return True

# search end of block
    nextLine = startLine

while True:
        nextLine += 1
        if nextLine >= endLine:
            # unclosed block should be autoclosed by end of document.
            # also block seems to be autoclosed by end of parent
            break

pos = mem = state.bMarks[nextLine] + state.tShift[nextLine]
        maximum = state.eMarks[nextLine]

if pos < maximum and state.sCount[nextLine] < state.blkIndent:
            # non-empty line with negative indent should stop the list:
            # - ```
            #  test
            break

try:
            if state.src[pos] != marker:
                continue
        except IndexError:
            break

if state.is_code_block(nextLine):
            continue

pos = state.skipCharsStr(pos, marker)

# closing code fence must be at least as long as the opening one
        if pos - mem < length:
            continue

# make sure tail has spaces only
        pos = state.skipSpaces(pos)

if pos < maximum:
            continue

haveEndMarker = True
        # found!
        break

# If a fence has heading spaces, they should be removed from its inner block
    length = state.sCount[startLine]

state.line = nextLine + (1 if haveEndMarker else 0)

token = state.push("fence", "code", 0)
    token.info = params
    token.content = state.getLines(startLine + 1, nextLine, length, True)
    token.markup = markup
    token.map = [startLine, state.line]

return True

MR SKB