Add define_database

Author: Ce11an

examples/define_database.surql

@@ -0,0 +1,11 @@
+-- Define database
+DEFINE DATABASE app_vitalsense;
+
+-- Create a DATABASE if it does not already exist
+DEFINE DATABASE IF NOT EXISTS app_vitalsense;
+
+-- Create a DATABASE and overwrite if it already exists
+DEFINE DATABASE OVERWRITE app_vitalsense;
+
+-- Create a DATABASE and overwrite if it already exists with a comment
+DEFINE DATABASE OVERWRITE app_vitalsense COMMENT "This is a comment";

grammar.js

@@ -200,6 +200,7 @@ module.exports = grammar({
         $.cancel_statement,
         $.commit_statement,
         $.define_analyzer_statement,
+        $.define_database,
         $.define_event_statement,
         $.define_field_statement,
         $.define_function_statement,
@@ -242,6 +243,15 @@ module.exports = grammar({
         ),
       ),
 
+    define_database: $ =>
+      seq(
+        $.keyword_define,
+        $.keyword_database,
+        optional(choice($.if_not_exists_clause, $.keyword_overwrite)),
+        $.identifier,
+        optional($.comment_clause),
+      ),
+
     define_event_statement: $ =>
       seq(
         $.keyword_define,