122 lines
3.4 KiB
Python
122 lines
3.4 KiB
Python
#
|
|
# Copyright (C) 2009-2020 the sqlparse authors and contributors
|
|
# <see AUTHORS file>
|
|
#
|
|
# This module is part of python-sqlparse and is released under
|
|
# the BSD License: https://opensource.org/licenses/BSD-3-Clause
|
|
|
|
import itertools
|
|
import re
|
|
from collections import deque
|
|
from contextlib import contextmanager
|
|
|
|
# This regular expression replaces the home-cooked parser that was here before.
|
|
# It is much faster, but requires an extra post-processing step to get the
|
|
# desired results (that are compatible with what you would expect from the
|
|
# str.splitlines() method).
|
|
#
|
|
# It matches groups of characters: newlines, quoted strings, or unquoted text,
|
|
# and splits on that basis. The post-processing step puts those back together
|
|
# into the actual lines of SQL.
|
|
SPLIT_REGEX = re.compile(r"""
|
|
(
|
|
(?: # Start of non-capturing group
|
|
(?:\r\n|\r|\n) | # Match any single newline, or
|
|
[^\r\n'"]+ | # Match any character series without quotes or
|
|
# newlines, or
|
|
"(?:[^"\\]|\\.)*" | # Match double-quoted strings, or
|
|
'(?:[^'\\]|\\.)*' # Match single quoted strings
|
|
)
|
|
)
|
|
""", re.VERBOSE)
|
|
|
|
LINE_MATCH = re.compile(r'(\r\n|\r|\n)')
|
|
|
|
|
|
def split_unquoted_newlines(stmt):
|
|
"""Split a string on all unquoted newlines.
|
|
|
|
Unlike str.splitlines(), this will ignore CR/LF/CR+LF if the requisite
|
|
character is inside of a string."""
|
|
text = str(stmt)
|
|
lines = SPLIT_REGEX.split(text)
|
|
outputlines = ['']
|
|
for line in lines:
|
|
if not line:
|
|
continue
|
|
elif LINE_MATCH.match(line):
|
|
outputlines.append('')
|
|
else:
|
|
outputlines[-1] += line
|
|
return outputlines
|
|
|
|
|
|
def remove_quotes(val):
|
|
"""Helper that removes surrounding quotes from strings."""
|
|
if val is None:
|
|
return
|
|
if val[0] in ('"', "'") and val[0] == val[-1]:
|
|
val = val[1:-1]
|
|
return val
|
|
|
|
|
|
def recurse(*cls):
|
|
"""Function decorator to help with recursion
|
|
|
|
:param cls: Classes to not recurse over
|
|
:return: function
|
|
"""
|
|
def wrap(f):
|
|
def wrapped_f(tlist):
|
|
for sgroup in tlist.get_sublists():
|
|
if not isinstance(sgroup, cls):
|
|
wrapped_f(sgroup)
|
|
f(tlist)
|
|
|
|
return wrapped_f
|
|
|
|
return wrap
|
|
|
|
|
|
def imt(token, i=None, m=None, t=None):
|
|
"""Helper function to simplify comparisons Instance, Match and TokenType
|
|
:param token:
|
|
:param i: Class or Tuple/List of Classes
|
|
:param m: Tuple of TokenType & Value. Can be list of Tuple for multiple
|
|
:param t: TokenType or Tuple/List of TokenTypes
|
|
:return: bool
|
|
"""
|
|
clss = i
|
|
types = [t, ] if t and not isinstance(t, list) else t
|
|
mpatterns = [m, ] if m and not isinstance(m, list) else m
|
|
|
|
if token is None:
|
|
return False
|
|
elif clss and isinstance(token, clss):
|
|
return True
|
|
elif mpatterns and any(token.match(*pattern) for pattern in mpatterns):
|
|
return True
|
|
elif types and any(token.ttype in ttype for ttype in types):
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
|
|
def consume(iterator, n):
|
|
"""Advance the iterator n-steps ahead. If n is none, consume entirely."""
|
|
deque(itertools.islice(iterator, n), maxlen=0)
|
|
|
|
|
|
@contextmanager
|
|
def offset(filter_, n=0):
|
|
filter_.offset += n
|
|
yield
|
|
filter_.offset -= n
|
|
|
|
|
|
@contextmanager
|
|
def indent(filter_, n=1):
|
|
filter_.indent += n
|
|
yield
|
|
filter_.indent -= n
|