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from __future__ import annotations
from typing import TYPE_CHECKING, Literal
from ..common.utils import isStrSpace
from ..ruler import StateBase
from ..token import Token
from ..utils import EnvType
if TYPE_CHECKING:
from markdown_it.main import MarkdownIt
class StateBlock(StateBase):
def __init__(
self, src: str, md: MarkdownIt, env: EnvType, tokens: list[Token]
) -> None:
self.src = src
# link to parser instance
self.md = md
self.env = env
#
# Internal state variables
#
self.tokens = tokens
self.bMarks: list[int] = [] # line begin offsets for fast jumps
self.eMarks: list[int] = [] # line end offsets for fast jumps
# offsets of the first non-space characters (tabs not expanded)
self.tShift: list[int] = []
self.sCount: list[int] = [] # indents for each line (tabs expanded)
# An amount of virtual spaces (tabs expanded) between beginning
# of each line (bMarks) and real beginning of that line.
#
# It exists only as a hack because blockquotes override bMarks
# losing information in the process.
#
# It's used only when expanding tabs, you can think about it as
# an initial tab length, e.g. bsCount=21 applied to string `\t123`
# means first tab should be expanded to 4-21%4 === 3 spaces.
#
self.bsCount: list[int] = []
# block parser variables
self.blkIndent = 0 # required block content indent (for example, if we are
# inside a list, it would be positioned after list marker)
self.line = 0 # line index in src
self.lineMax = 0 # lines count
self.tight = False # loose/tight mode for lists
self.ddIndent = -1 # indent of the current dd block (-1 if there isn't any)
self.listIndent = -1 # indent of the current list block (-1 if there isn't any)
# can be 'blockquote', 'list', 'root', 'paragraph' or 'reference'
# used in lists to determine if they interrupt a paragraph
self.parentType = "root"
self.level = 0
# renderer
self.result = ""
# Create caches
# Generate markers.
indent_found = False
start = pos = indent = offset = 0
length = len(self.src)
for pos, character in enumerate(self.src):
if not indent_found:
if isStrSpace(character):
indent += 1
if character == "\t":
offset += 4 - offset % 4
else:
offset += 1
continue
else:
indent_found = True
if character == "\n" or pos == length - 1:
if character != "\n":
pos += 1
self.bMarks.append(start)
self.eMarks.append(pos)
self.tShift.append(indent)
self.sCount.append(offset)
self.bsCount.append(0)
indent_found = False
indent = 0
offset = 0
start = pos + 1
# Push fake entry to simplify cache bounds checks
self.bMarks.append(length)
self.eMarks.append(length)
self.tShift.append(0)
self.sCount.append(0)
self.bsCount.append(0)
self.lineMax = len(self.bMarks) - 1 # don't count last fake line
# pre-check if code blocks are enabled, to speed up is_code_block method
self._code_enabled = "code" in self.md["block"].ruler.get_active_rules()
def __repr__(self) -> str:
return (
f"{self.__class__.__name__}"
f"(line={self.line},level={self.level},tokens={len(self.tokens)})"
)
def push(self, ttype: str, tag: str, nesting: Literal[-1, 0, 1]) -> Token:
"""Push new token to "stream"."""
token = Token(ttype, tag, nesting)
token.block = True
if nesting < 0:
self.level -= 1 # closing tag
token.level = self.level
if nesting > 0:
self.level += 1 # opening tag
self.tokens.append(token)
return token
def isEmpty(self, line: int) -> bool:
"""."""
return (self.bMarks[line] + self.tShift[line]) >= self.eMarks[line]
def skipEmptyLines(self, from_pos: int) -> int:
"""."""
while from_pos < self.lineMax:
try:
if (self.bMarks[from_pos] + self.tShift[from_pos]) < self.eMarks[
from_pos
]:
break
except IndexError:
pass
from_pos += 1
return from_pos
def skipSpaces(self, pos: int) -> int:
"""Skip spaces from given position."""
while True:
try:
current = self.src[pos]
except IndexError:
break
if not isStrSpace(current):
break
pos += 1
return pos
def skipSpacesBack(self, pos: int, minimum: int) -> int:
"""Skip spaces from given position in reverse."""
if pos <= minimum:
return pos
while pos > minimum:
pos -= 1
if not isStrSpace(self.src[pos]):
return pos + 1
return pos
def skipChars(self, pos: int, code: int) -> int:
"""Skip character code from given position."""
while True:
try:
current = self.srcCharCode[pos]
except IndexError:
break
if current != code:
break
pos += 1
return pos
def skipCharsStr(self, pos: int, ch: str) -> int:
"""Skip character string from given position."""
while True:
try:
current = self.src[pos]
except IndexError:
break
if current != ch:
break
pos += 1
return pos
def skipCharsBack(self, pos: int, code: int, minimum: int) -> int:
"""Skip character code reverse from given position - 1."""
if pos <= minimum:
return pos
while pos > minimum:
pos -= 1
if code != self.srcCharCode[pos]:
return pos + 1
return pos
def skipCharsStrBack(self, pos: int, ch: str, minimum: int) -> int:
"""Skip character string reverse from given position - 1."""
if pos <= minimum:
return pos
while pos > minimum:
pos -= 1
if ch != self.src[pos]:
return pos + 1
return pos
def getLines(self, begin: int, end: int, indent: int, keepLastLF: bool) -> str:
"""Cut lines range from source."""
line = begin
if begin >= end:
return ""
queue = [""] * (end - begin)
i = 1
while line < end:
lineIndent = 0
lineStart = first = self.bMarks[line]
last = (
self.eMarks[line] + 1
if line + 1 < end or keepLastLF
else self.eMarks[line]
)
while (first < last) and (lineIndent < indent):
ch = self.src[first]
if isStrSpace(ch):
if ch == "\t":
lineIndent += 4 - (lineIndent + self.bsCount[line]) % 4
else:
lineIndent += 1
elif first - lineStart < self.tShift[line]:
lineIndent += 1
else:
break
first += 1
if lineIndent > indent:
# partially expanding tabs in code blocks, e.g '\t\tfoobar'
# with indent=2 becomes ' \tfoobar'
queue[i - 1] = (" " * (lineIndent - indent)) + self.src[first:last]
else:
queue[i - 1] = self.src[first:last]
line += 1
i += 1
return "".join(queue)
def is_code_block(self, line: int) -> bool:
"""Check if line is a code block,
i.e. the code block rule is enabled and text is indented by more than 3 spaces.
"""
return self._code_enabled and (self.sCount[line] - self.blkIndent) >= 4
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