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# -*- coding: utf-8 -*-
# Copyright (C) 2016 Adrien Vergé
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import yaml
class Line(object):
def __init__(self, line_no, buffer, start, end):
self.line_no = line_no
self.start = start
self.end = end
self.buffer = buffer
@property
def content(self):
return self.buffer[self.start:self.end]
class Token(object):
def __init__(self, line_no, curr, prev, next, nextnext):
self.line_no = line_no
self.curr = curr
self.prev = prev
self.next = next
self.nextnext = nextnext
class Comment(object):
def __init__(self, line_no, column_no, buffer, pointer,
token_before=None, token_after=None, comment_before=None):
self.line_no = line_no
self.column_no = column_no
self.buffer = buffer
self.pointer = pointer
self.token_before = token_before
self.token_after = token_after
self.comment_before = comment_before
def __str__(self):
end = self.buffer.find('\n', self.pointer)
if end == -1:
end = self.buffer.find('\0', self.pointer)
if end != -1:
return self.buffer[self.pointer:end]
return self.buffer[self.pointer:]
def __eq__(self, other):
return (isinstance(other, Comment) and
self.line_no == other.line_no and
self.column_no == other.column_no and
str(self) == str(other))
def is_inline(self):
return (
not isinstance(self.token_before, yaml.StreamStartToken) and
self.line_no == self.token_before.end_mark.line + 1 and
# sometimes token end marks are on the next line
self.buffer[self.token_before.end_mark.pointer - 1] != '\n'
)
def line_generator(buffer):
line_no = 1
cur = 0
next = buffer.find('\n')
while next != -1:
if next > 0 and buffer[next - 1] == '\r':
yield Line(line_no, buffer, start=cur, end=next - 1)
else:
yield Line(line_no, buffer, start=cur, end=next)
cur = next + 1
next = buffer.find('\n', cur)
line_no += 1
yield Line(line_no, buffer, start=cur, end=len(buffer))
def comments_between_tokens(token1, token2):
"""Find all comments between two tokens"""
if token2 is None:
buf = token1.end_mark.buffer[token1.end_mark.pointer:]
elif (token1.end_mark.line == token2.start_mark.line and
not isinstance(token1, yaml.StreamStartToken) and
not isinstance(token2, yaml.StreamEndToken)):
return
else:
buf = token1.end_mark.buffer[token1.end_mark.pointer:
token2.start_mark.pointer]
line_no = token1.end_mark.line + 1
column_no = token1.end_mark.column + 1
pointer = token1.end_mark.pointer
comment_before = None
for line in buf.split('\n'):
pos = line.find('#')
if pos != -1:
comment = Comment(line_no, column_no + pos,
token1.end_mark.buffer, pointer + pos,
token1, token2, comment_before)
yield comment
comment_before = comment
pointer += len(line) + 1
line_no += 1
column_no = 1
def token_or_comment_generator(buffer):
yaml_loader = yaml.BaseLoader(buffer)
try:
prev = None
curr = yaml_loader.get_token()
while curr is not None:
next = yaml_loader.get_token()
nextnext = (yaml_loader.peek_token()
if yaml_loader.check_token() else None)
yield Token(curr.start_mark.line + 1, curr, prev, next, nextnext)
for comment in comments_between_tokens(curr, next):
yield comment
prev = curr
curr = next
except yaml.scanner.ScannerError:
pass
def token_or_comment_or_line_generator(buffer):
"""Generator that mixes tokens and lines, ordering them by line number"""
tok_or_com_gen = token_or_comment_generator(buffer)
line_gen = line_generator(buffer)
tok_or_com = next(tok_or_com_gen, None)
line = next(line_gen, None)
while tok_or_com is not None or line is not None:
if tok_or_com is None or (line is not None and
tok_or_com.line_no > line.line_no):
yield line
line = next(line_gen, None)
else:
yield tok_or_com
tok_or_com = next(tok_or_com_gen, None)
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