Refactor sql_analyser into multiple classes for simpler extension in the future

django_migration_linter/sql_analyser/analyser.py

@@ -0,0 +1,46 @@
+# Copyright 2019 3YOURMIND GmbH
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+# http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+
+from django_migration_linter.sql_analyser import (
+    BaseAnalyser,
+    MySqlAnalyser,
+    PostgresqlAnalyser,
+    SqliteAnalyser,
+)
+
+logger = logging.getLogger(__name__)
+
+
+def get_sql_analyser(database_vendor, exclude_migration_tests=None):
+    if "mysql" in database_vendor:
+        sql_analyser_class = MySqlAnalyser
+    elif "postgre" in database_vendor:
+        sql_analyser_class = PostgresqlAnalyser
+    elif "sqlite" in database_vendor:
+        sql_analyser_class = SqliteAnalyser
+    else:
+        sql_analyser_class = BaseAnalyser
+
+    logger.debug("Chosen SQL analyser class: %s", sql_analyser_class)
+    return sql_analyser_class(exclude_migration_tests)
+
+
+def analyse_sql_statements(
+    sql_statements, database_vendor, exclude_migration_tests=None
+):
+    sql_analyser = get_sql_analyser(database_vendor, exclude_migration_tests)
+    sql_analyser.analyse(sql_statements)
+    return sql_analyser.errors, sql_analyser.ignored