Normalize the identifier quoting so we can reuse the functions for mysql

lib/ansible/module_utils/database.py

@@ -35,13 +35,14 @@ class UnclosedQuoteError(SQLParseError):
 # maps a type of identifier to the maximum number of dot levels that are
 # allowed to specifiy that identifier.  For example, a database column can be
 # specified by up to 4 levels: database.schema.table.column
-_IDENTIFIER_TO_DOT_LEVEL = dict(database=1, schema=2, table=3, column=4, role=1)
+_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)
 
-def _find_end_quote(identifier):
+def _find_end_quote(identifier, quote_char='"'):
     accumulate = 0
     while True:
         try:
-            quote = identifier.index('"')
+            quote = identifier.index(quote_char)
         except ValueError:
             raise UnclosedQuoteError
         accumulate = accumulate + quote
@@ -49,7 +50,7 @@ def _find_end_quote(identifier):
             next_char = identifier[quote+1]
         except IndexError:
             return accumulate
-        if next_char == '"':
+        if next_char == quote_char:
             try:
                 identifier = identifier[quote+2:]
                 accumulate = accumulate + 2
@@ -59,15 +60,15 @@ def _find_end_quote(identifier):
             return accumulate
 
 
-def _identifier_parse(identifier):
+def _identifier_parse(identifier, quote_char='"'):
     if not identifier:
         raise SQLParseError('Identifier name unspecified or unquoted trailing dot')
 
     already_quoted = False
-    if identifier.startswith('"'):
+    if identifier.startswith(quote_char):
         already_quoted = True
         try:
-            end_quote = _find_end_quote(identifier[1:]) + 1
+            end_quote = _find_end_quote(identifier[1:], quote_char=quote_char) + 1
         except UnclosedQuoteError:
             already_quoted = False
         else:
@@ -87,27 +88,33 @@ def _identifier_parse(identifier):
         try:
             dot = identifier.index('.')
         except ValueError:
-            identifier = identifier.replace('"', '""')
-            identifier = ''.join(('"', identifier, '"'))
+            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('"', '""')
-                identifier = ''.join(('"', identifier, '"'))
+                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)
-                first_identifier = first_identifier.replace('"', '""')
-                first_identifier = ''.join(('"', first_identifier, '"'))
+                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
 
 
 def pg_quote_identifier(identifier, id_type):
-    identifier_fragments = _identifier_parse(identifier)
-    if len(identifier_fragments) > _IDENTIFIER_TO_DOT_LEVEL[id_type]:
-        raise SQLParseError('PostgreSQL does not support %s with more than %i dots' % (id_type, _IDENTIFIER_TO_DOT_LEVEL[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)
+
+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, _IDENTIFIER_TO_DOT_LEVEL[id_type]))
     return '.'.join(identifier_fragments)