def _find_true_position(self, node):
"""Return correct line number and column offset for a given node.
This is necessary mainly because ListComp's location reporting reports
the next token after the list comprehension list opening.
Args:
node: Node for which we wish to know the lineno and col_offset
"""
import re
find_open = re.compile("^\s*(\\[).*$")
find_string_chars = re.compile("['\"]")
if isinstance(node, ast.ListComp):
# Strangely, ast.ListComp returns the col_offset of the first token
# after the '[' token which appears to be a bug. Workaround by
# explicitly finding the real start of the list comprehension.
line = node.lineno
col = node.col_offset
# loop over lines
while 1:
# Reverse the text to and regular expression search for whitespace
text = self._lines[line-1]
reversed_preceding_text = text[:col][::-1]
# First find if a [ can be found with only whitespace between it and
# col.
m = find_open.match(reversed_preceding_text)
if m:
new_col_offset = col - m.start(1) - 1
return line, new_col_offset
else:
if (reversed_preceding_text=="" or
reversed_preceding_text.isspace()):
line = line - 1
prev_line = self._lines[line - 1]
# TODO(aselle):
# this is poor comment detection, but it is good enough for
# cases where the comment does not contain string literal starting/
# ending characters. If ast gave us start and end locations of the
# ast nodes rather than just start, we could use string literal
# node ranges to filter out spurious #'s that appear in string
# literals.
comment_start = prev_line.find("#")
if comment_start == -1:
col = len(prev_line) -1
elif find_string_chars.search(prev_line[comment_start:]) is None:
col = comment_start
else:
return None, None
# Most other nodes return proper locations (with notably does not), but
# it is not possible to use that in an argument.
return node.lineno, node.col_offset
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