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from markdown_it import MarkdownIt
from markdown_it.common.utils import escapeHtml, unescapeAll
from markdown_it.rules_block import StateBlock
def colon_fence_plugin(md: MarkdownIt):
"""This plugin directly mimics regular fences, but with `:` colons.
Example::
:::name
contained text
:::
"""
md.block.ruler.before(
"fence",
"colon_fence",
_rule,
{"alt": ["paragraph", "reference", "blockquote", "list", "footnote_def"]},
)
md.add_render_rule("colon_fence", _render)
def _rule(state: StateBlock, startLine: int, endLine: int, silent: bool):
haveEndMarker = False
pos = state.bMarks[startLine] + state.tShift[startLine]
maximum = state.eMarks[startLine]
# if it's indented more than 3 spaces, it should be a code block
if state.sCount[startLine] - state.blkIndent >= 4:
return False
if pos + 3 > maximum:
return False
marker = state.srcCharCode[pos]
# /* : */
if marker != 0x3A:
return False
# scan marker length
mem = pos
pos = state.skipChars(pos, marker)
length = pos - mem
if length < 3:
return False
markup = state.src[mem:pos]
params = state.src[pos:maximum]
# 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
if state.srcCharCode[pos] != marker:
continue
if state.sCount[nextLine] - state.blkIndent >= 4:
# closing fence should be indented less than 4 spaces
continue
pos = state.skipChars(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("colon_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
def _render(self, tokens, idx, options, env):
token = tokens[idx]
info = unescapeAll(token.info).strip() if token.info else ""
content = escapeHtml(token.content)
block_name = ""
if info:
block_name = info.split()[0]
return (
"<pre><code"
+ (f' class="block-{block_name}" ' if block_name else "")
+ ">"
+ content
+ "</code></pre>\n"
)
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