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from __future__ import annotations
from . import error
Err = error.Err
class Post:
def __init__(self):
self.meta: dict[bytes, bytes] = {}
self.title: bytes = b""
self.replies: list[Post] = []
def reply_get(self, needle: bytes) -> Post | None:
for reply in self.replies:
if b"id" not in reply.meta:
continue
if reply.meta[b"id"] == needle:
return reply
res = reply.reply_get(needle)
if res is not None:
return res
return None
def post_count(self) -> int:
count = 1
for reply in self.replies:
count += reply.post_count()
return count
def is_newline(c: int) -> bool:
return (
c == ord('\n')
or c == ord('\r')
)
def is_whitespace(c: int) -> bool:
return (
c == ord(' ')
or c == ord('\t')
or is_newline(c)
)
def parse_ini(src: bytes | memoryview, i: int, res: dict[bytes, bytes]) -> int:
src = memoryview(src)
STATE_START = 0
STATE_KEY = 1
STATE_VALUE = 2
state = STATE_START
key = bytearray()
value = bytearray()
while i < len(src):
if state == STATE_START:
if src[i:i+4] == b"```\n":
return i + 4
elif src[i] == ord(' '):
pass
else:
state = STATE_KEY
continue
elif state == STATE_KEY:
if src[i] == ord('='):
state = STATE_VALUE
else:
key.append(src[i])
elif state == STATE_VALUE:
if is_newline(src[i]) or src[i] == ord(';'):
if src[i] == ord(';'):
while len(value) > 0 and is_whitespace(value[-1]):
value.pop()
while i < len(src) and not is_newline(src[i]):
i += 1
res[bytes(key)] = bytes(value)
state = STATE_START
key.clear()
value.clear()
else:
value.append(src[i])
else:
assert False, "unreachable: state enum not exhausted"
i += 1
return -1
def parse(src: bytes | memoryview) -> tuple[Post, Err | None]:
def success(post: Post) -> tuple[Post, Err | None]:
return post, None
def fail(msg: str) -> tuple[Post, Err | None]:
return Post(), Err(msg)
src = memoryview(src)
issue = Post()
issue_title: bytes | None = None
i = 0
post = issue
while i < len(src):
if src[i:i+4] == b"\n---":
i += 4
post = Post()
continue
if src[i:i+7] == b"```ini\n":
i += 7
i = parse_ini(src, i, post.meta)
if i == -1:
return fail("ERR_FAILED_TO_PARSE_INI")
if b"reply" in post.meta:
reply = issue.reply_get(post.meta[b"reply"])
if reply is None:
return fail("ERR_REPLY_TO_NONEXISTENT_ID")
reply.replies.append(post)
elif post != issue:
issue.replies.append(post)
continue
if issue_title is None and src[i:i+2] == b"# ":
i += 2
title_start = i
while i < len(src):
if is_newline(src[i]):
break
i += 1
issue_title = bytes(src[title_start:i])
continue
i += 1
if issue_title is None:
return fail("ERR_ISSUE_NO_TITLE")
issue.title = issue_title
return success(issue)
def clean_after_edit(src: bytes | memoryview, last_ini_prefix: bytes) -> bytes:
src = memoryview(src)
last_ini_prefix = bytes(last_ini_prefix)
res: list[int] = []
i = 0
last_ini_start = 0
while i < len(src):
while i < len(src):
if src[i:i+7] == b"```ini\n":
res.extend(src[i:i+7])
last_ini_start = len(res)
i += 7
break
res.append(src[i])
i += 1
while i < len(src):
# inside ini
if src[i:i+4] == b"\n```":
res.extend(src[i:i+4])
i += 4
break
elif src[i:i+3] == b" ; ":
i += 3
while i < len(src):
if is_newline(src[i]):
break
i += 1
res.append(src[i])
i += 1
res[last_ini_start:last_ini_start] = last_ini_prefix
return bytes(res)
|
