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venv/Lib/site-packages/sqlparse/utils.py

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+#
+# 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