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Normalize the identifier quoting so we can reuse the functions for mysql
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parent
19606afe5f
commit
0287e9a23d
1 changed files with 23 additions and 16 deletions
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@ -35,13 +35,14 @@ class UnclosedQuoteError(SQLParseError):
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# maps a type of identifier to the maximum number of dot levels that are
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# allowed to specifiy that identifier. For example, a database column can be
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# specified by up to 4 levels: database.schema.table.column
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_IDENTIFIER_TO_DOT_LEVEL = dict(database=1, schema=2, table=3, column=4, role=1)
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_PG_IDENTIFIER_TO_DOT_LEVEL = dict(database=1, schema=2, table=3, column=4, role=1)
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_MYSQL_IDENTIFIER_TO_DOT_LEVEL = dict(database=1, table=2, column=3, role=1)
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def _find_end_quote(identifier):
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def _find_end_quote(identifier, quote_char='"'):
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accumulate = 0
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while True:
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try:
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quote = identifier.index('"')
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quote = identifier.index(quote_char)
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except ValueError:
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raise UnclosedQuoteError
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accumulate = accumulate + quote
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@ -49,7 +50,7 @@ def _find_end_quote(identifier):
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next_char = identifier[quote+1]
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except IndexError:
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return accumulate
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if next_char == '"':
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if next_char == quote_char:
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try:
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identifier = identifier[quote+2:]
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accumulate = accumulate + 2
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@ -59,15 +60,15 @@ def _find_end_quote(identifier):
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return accumulate
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def _identifier_parse(identifier):
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def _identifier_parse(identifier, quote_char='"'):
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if not identifier:
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raise SQLParseError('Identifier name unspecified or unquoted trailing dot')
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already_quoted = False
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if identifier.startswith('"'):
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if identifier.startswith(quote_char):
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already_quoted = True
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try:
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end_quote = _find_end_quote(identifier[1:]) + 1
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end_quote = _find_end_quote(identifier[1:], quote_char=quote_char) + 1
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except UnclosedQuoteError:
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already_quoted = False
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else:
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@ -87,27 +88,33 @@ def _identifier_parse(identifier):
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try:
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dot = identifier.index('.')
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except ValueError:
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identifier = identifier.replace('"', '""')
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identifier = ''.join(('"', identifier, '"'))
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identifier = identifier.replace(quote_char, quote_char*2)
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identifier = ''.join((quote_char, identifier, quote_char))
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further_identifiers = [identifier]
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else:
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if dot == 0 or dot >= len(identifier) - 1:
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identifier = identifier.replace('"', '""')
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identifier = ''.join(('"', identifier, '"'))
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identifier = identifier.replace(quote_char, quote_char*2)
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identifier = ''.join((quote_char, identifier, quote_char))
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further_identifiers = [identifier]
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else:
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first_identifier = identifier[:dot]
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next_identifier = identifier[dot+1:]
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further_identifiers = _identifier_parse(next_identifier)
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first_identifier = first_identifier.replace('"', '""')
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first_identifier = ''.join(('"', first_identifier, '"'))
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first_identifier = first_identifier.replace(quote_char, quote_char*2)
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first_identifier = ''.join((quote_char, first_identifier, quote_char))
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further_identifiers.insert(0, first_identifier)
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return further_identifiers
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def pg_quote_identifier(identifier, id_type):
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identifier_fragments = _identifier_parse(identifier)
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if len(identifier_fragments) > _IDENTIFIER_TO_DOT_LEVEL[id_type]:
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raise SQLParseError('PostgreSQL does not support %s with more than %i dots' % (id_type, _IDENTIFIER_TO_DOT_LEVEL[id_type]))
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identifier_fragments = _identifier_parse(identifier, quote_char='"')
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if len(identifier_fragments) > _PG_IDENTIFIER_TO_DOT_LEVEL[id_type]:
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raise SQLParseError('PostgreSQL does not support %s with more than %i dots' % (id_type, _PG_IDENTIFIER_TO_DOT_LEVEL[id_type]))
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return '.'.join(identifier_fragments)
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def mysql_quote_identifier(identifier, id_type):
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identifier_fragments = _identifier_parse(identifier, quote_char='`')
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if len(identifier_fragments) > _MYSQL_IDENTIFIER_TO_DOT_LEVEL[id_type]:
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raise SQLParseError('MySQL does not support %s with more than %i dots' % (id_type, _IDENTIFIER_TO_DOT_LEVEL[id_type]))
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return '.'.join(identifier_fragments)
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