# This code is part of Ansible, but is an independent component.
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# still belong to the author of the module, and may assign their own license
# to the complete work.
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# Copyright (c) 2014, Toshio Kuratomi <tkuratomi@ansible.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
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# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
[docs]class SQLParseError(Exception):
pass
[docs]class UnclosedQuoteError(SQLParseError):
pass
# maps a type of identifier to the maximum number of dot levels that are
# allowed to specify that identifier. For example, a database column can be
# specified by up to 4 levels: database.schema.table.column
_PG_IDENTIFIER_TO_DOT_LEVEL = dict(database=1, schema=2, table=3, column=4, role=1)
_MYSQL_IDENTIFIER_TO_DOT_LEVEL = dict(database=1, table=2, column=3, role=1, vars=1)
def _find_end_quote(identifier, quote_char):
accumulate = 0
while True:
try:
quote = identifier.index(quote_char)
except ValueError:
raise UnclosedQuoteError
accumulate = accumulate + quote
try:
next_char = identifier[quote+1]
except IndexError:
return accumulate
if next_char == quote_char:
try:
identifier = identifier[quote+2:]
accumulate = accumulate + 2
except IndexError:
raise UnclosedQuoteError
else:
return accumulate
def _identifier_parse(identifier, quote_char):
if not identifier:
raise SQLParseError('Identifier name unspecified or unquoted trailing dot')
already_quoted = False
if identifier.startswith(quote_char):
already_quoted = True
try:
end_quote = _find_end_quote(identifier[1:], quote_char=quote_char) + 1
except UnclosedQuoteError:
already_quoted = False
else:
if end_quote < len(identifier) - 1:
if identifier[end_quote+1] == '.':
dot = end_quote + 1
first_identifier = identifier[:dot]
next_identifier = identifier[dot+1:]
further_identifiers = _identifier_parse(next_identifier, quote_char)
further_identifiers.insert(0, first_identifier)
else:
raise SQLParseError('User escaped identifiers must escape extra quotes')
else:
further_identifiers = [identifier]
if not already_quoted:
try:
dot = identifier.index('.')
except ValueError:
identifier = identifier.replace(quote_char, quote_char*2)
identifier = ''.join((quote_char, identifier, quote_char))
further_identifiers = [identifier]
else:
if dot == 0 or dot >= len(identifier) - 1:
identifier = identifier.replace(quote_char, quote_char*2)
identifier = ''.join((quote_char, identifier, quote_char))
further_identifiers = [identifier]
else:
first_identifier = identifier[:dot]
next_identifier = identifier[dot+1:]
further_identifiers = _identifier_parse(next_identifier, quote_char)
first_identifier = first_identifier.replace(quote_char, quote_char*2)
first_identifier = ''.join((quote_char, first_identifier, quote_char))
further_identifiers.insert(0, first_identifier)
return further_identifiers
[docs]def pg_quote_identifier(identifier, id_type):
identifier_fragments = _identifier_parse(identifier, quote_char='"')
if len(identifier_fragments) > _PG_IDENTIFIER_TO_DOT_LEVEL[id_type]:
raise SQLParseError('PostgreSQL does not support %s with more than %i dots' % (id_type, _PG_IDENTIFIER_TO_DOT_LEVEL[id_type]))
return '.'.join(identifier_fragments)
[docs]def mysql_quote_identifier(identifier, id_type):
identifier_fragments = _identifier_parse(identifier, quote_char='`')
if len(identifier_fragments) > _MYSQL_IDENTIFIER_TO_DOT_LEVEL[id_type]:
raise SQLParseError('MySQL does not support %s with more than %i dots' % (id_type, _MYSQL_IDENTIFIER_TO_DOT_LEVEL[id_type]))
special_cased_fragments = []
for fragment in identifier_fragments:
if fragment == '`*`':
special_cased_fragments.append('*')
else:
special_cased_fragments.append(fragment)
return '.'.join(special_cased_fragments)