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"""Process front matter."""
from markdown_it import MarkdownIt
from markdown_it.rules_block import StateBlock
from mdit_py_plugins.utils import is_code_block
def front_matter_plugin(md: MarkdownIt) -> None:
"""Plugin ported from
`markdown-it-front-matter <https://github.com/ParkSB/markdown-it-front-matter>`__.
It parses initial metadata, stored between opening/closing dashes:
.. code-block:: md
---
valid-front-matter: true
---
"""
md.block.ruler.before(
"table",
"front_matter",
_front_matter_rule,
{"alt": ["paragraph", "reference", "blockquote", "list"]},
)
def _front_matter_rule(
state: StateBlock, startLine: int, endLine: int, silent: bool
) -> bool:
marker_chr = "-"
min_markers = 3
auto_closed = False
start = state.bMarks[startLine] + state.tShift[startLine]
maximum = state.eMarks[startLine]
src_len = len(state.src)
# Check out the first character of the first line quickly,
# this should filter out non-front matter
if startLine != 0 or state.src[0] != marker_chr:
return False
# Check out the rest of the marker string
# while pos <= 3
pos = start + 1
while pos <= maximum and pos < src_len:
if state.src[pos] != marker_chr:
break
pos += 1
marker_count = pos - start
if marker_count < min_markers:
return False
# Since start is found, we can report success here in validation mode
if silent:
return True
# Search for the end of the block
nextLine = startLine
while True:
nextLine += 1
if nextLine >= endLine:
# unclosed block should be autoclosed by end of document.
return False
if state.src[start:maximum] == "...":
break
start = state.bMarks[nextLine] + state.tShift[nextLine]
maximum = state.eMarks[nextLine]
if start < maximum and state.sCount[nextLine] < state.blkIndent:
# non-empty line with negative indent should stop the list:
# - ```
# test
break
if state.src[start] != marker_chr:
continue
if is_code_block(state, nextLine):
continue
pos = start + 1
while pos < maximum:
if state.src[pos] != marker_chr:
break
pos += 1
# closing code fence must be at least as long as the opening one
if (pos - start) < marker_count:
continue
# make sure tail has spaces only
pos = state.skipSpaces(pos)
if pos < maximum:
continue
# found!
auto_closed = True
break
old_parent = state.parentType
old_line_max = state.lineMax
state.parentType = "container"
# this will prevent lazy continuations from ever going past our end marker
state.lineMax = nextLine
token = state.push("front_matter", "", 0)
token.hidden = True
token.markup = marker_chr * min_markers
token.content = state.src[state.bMarks[startLine + 1] : state.eMarks[nextLine - 1]]
token.block = True
state.parentType = old_parent
state.lineMax = old_line_max
state.line = nextLine + (1 if auto_closed else 0)
token.map = [startLine, state.line]
return True
|
