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#!/usr/bin/env python
# encoding: utf-8
"""Implements TabStop transformations."""
import re
import sys
from UltiSnips.text import unescape, fill_in_whitespace
from UltiSnips.text_objects.mirror import Mirror
def _find_closing_brace(string, start_pos):
"""Finds the corresponding closing brace after start_pos."""
bracks_open = 1
escaped = False
for idx, char in enumerate(string[start_pos:]):
if char == "(":
if not escaped:
bracks_open += 1
elif char == ")":
if not escaped:
bracks_open -= 1
if not bracks_open:
return start_pos + idx + 1
if char == "\\":
escaped = not escaped
else:
escaped = False
def _split_conditional(string):
"""Split the given conditional 'string' into its arguments."""
bracks_open = 0
args = []
carg = ""
escaped = False
for idx, char in enumerate(string):
if char == "(":
if not escaped:
bracks_open += 1
elif char == ")":
if not escaped:
bracks_open -= 1
elif char == ":" and not bracks_open and not escaped:
args.append(carg)
carg = ""
escaped = False
continue
carg += char
if char == "\\":
escaped = not escaped
else:
escaped = False
args.append(carg)
return args
def _replace_conditional(match, string):
"""Replaces a conditional match in a transformation."""
conditional_match = _CONDITIONAL.search(string)
while conditional_match:
start = conditional_match.start()
end = _find_closing_brace(string, start + 4)
args = _split_conditional(string[start + 4 : end - 1])
rv = ""
if match.group(int(conditional_match.group(1))):
rv = unescape(_replace_conditional(match, args[0]))
elif len(args) > 1:
rv = unescape(_replace_conditional(match, args[1]))
string = string[:start] + rv + string[end:]
conditional_match = _CONDITIONAL.search(string)
return string
_ONE_CHAR_CASE_SWITCH = re.compile(r"\\([ul].)", re.DOTALL)
_LONG_CASEFOLDINGS = re.compile(r"\\([UL].*?)\\E", re.DOTALL)
_DOLLAR = re.compile(r"\$(\d+)", re.DOTALL)
_CONDITIONAL = re.compile(r"\(\?(\d+):", re.DOTALL)
class _CleverReplace(object):
"""Mimics TextMates replace syntax."""
def __init__(self, expression):
self._expression = expression
def replace(self, match):
"""Replaces 'match' through the correct replacement string."""
transformed = self._expression
# Replace all $? with capture groups
transformed = _DOLLAR.subn(lambda m: match.group(int(m.group(1))), transformed)[
0
]
# Replace Case switches
def _one_char_case_change(match):
"""Replaces one character case changes."""
if match.group(1)[0] == "u":
return match.group(1)[-1].upper()
else:
return match.group(1)[-1].lower()
transformed = _ONE_CHAR_CASE_SWITCH.subn(_one_char_case_change, transformed)[0]
def _multi_char_case_change(match):
"""Replaces multi character case changes."""
if match.group(1)[0] == "U":
return match.group(1)[1:].upper()
else:
return match.group(1)[1:].lower()
transformed = _LONG_CASEFOLDINGS.subn(_multi_char_case_change, transformed)[0]
transformed = _replace_conditional(match, transformed)
return unescape(fill_in_whitespace(transformed))
# flag used to display only one time the lack of unidecode
UNIDECODE_ALERT_RAISED = False
class TextObjectTransformation(object):
"""Base class for Transformations and ${VISUAL}."""
def __init__(self, token):
self._convert_to_ascii = False
self._find = None
if token.search is None:
return
flags = 0
self._match_this_many = 1
if token.options:
if "g" in token.options:
self._match_this_many = 0
if "i" in token.options:
flags |= re.IGNORECASE
if "m" in token.options:
flags |= re.MULTILINE
if "a" in token.options:
self._convert_to_ascii = True
self._find = re.compile(token.search, flags | re.DOTALL)
self._replace = _CleverReplace(token.replace)
def _transform(self, text):
"""Do the actual transform on the given text."""
global UNIDECODE_ALERT_RAISED # pylint:disable=global-statement
if self._convert_to_ascii:
try:
import unidecode
text = unidecode.unidecode(text)
except Exception: # pylint:disable=broad-except
if UNIDECODE_ALERT_RAISED == False:
UNIDECODE_ALERT_RAISED = True
sys.stderr.write(
"Please install unidecode python package in order to "
"be able to make ascii conversions.\n"
)
if self._find is None:
return text
return self._find.subn(self._replace.replace, text, self._match_this_many)[0]
class Transformation(Mirror, TextObjectTransformation):
"""See module docstring."""
def __init__(self, parent, ts, token):
Mirror.__init__(self, parent, ts, token)
TextObjectTransformation.__init__(self, token)
def _get_text(self):
return self._transform(self._ts.current_text)
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