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import re
import string
from collections.abc import Iterable
from typing import List, Tuple
from textwrap import dedent
from sybil import Region, Document
from sybil.evaluators.capture import evaluate_capture
CAPTURE_DIRECTIVE = re.compile(
r'^(?P<indent>(\t| )*)\.\.\s*-+>\s*(?P<name>\S+).*$'
)
def indent_matches(line: str, indent: str) -> bool:
# Is the indentation of a line match what we're looking for?
if not line.strip():
# the line consists entirely of whitespace (or nothing at all),
# so is not considered to be of the appropriate indentation
return False
if line.startswith(indent):
if line[len(indent)] not in string.whitespace:
return True
# if none of the above found the indentation to be a match, it is
# not a match
return False
class DocumentReversedLines(List[str]):
def __init__(self, document: Document) -> None:
super().__init__()
self[:] = document.text.splitlines(keepends=True)
self.current_line = len(self)
self.current_line_end_position = len(document.text)
def iterate_with_line_number(self) -> Iterable[Tuple[int, str]]:
while self.current_line > 0:
self.current_line -= 1
line = self[self.current_line]
self.current_line_end_position -= len(line)
yield self.current_line, line
class CaptureParser:
"""
A :any:`Parser` for :ref:`captures <capture-parser>`.
"""
def __call__(self, document: Document) -> Iterable[Region]:
lines = DocumentReversedLines(document)
for end_index, line in lines.iterate_with_line_number():
directive = CAPTURE_DIRECTIVE.match(line)
if directive:
region_end = lines.current_line_end_position
indent = directive.group('indent')
for start_index, line in lines.iterate_with_line_number():
if indent_matches(line, indent):
# don't include the preceding line in the capture
start_index += 1
break
else:
# make it blow up
start_index = end_index
if end_index - start_index < 2:
raise ValueError((
"couldn't find the start of the block to match "
"%r on line %i of %s"
) % (directive.group(), end_index+1, document.path))
# after dedenting, we need to remove excess leading and trailing
# newlines, before adding back the final newline that's strippped
# off
text = dedent(''.join(lines[start_index:end_index])).strip()+'\n'
name = directive.group('name')
parsed = name, text
yield Region(
lines.current_line_end_position,
region_end,
parsed,
evaluate_capture
)
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