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-rw-r--r--common/entities.js22
1 files changed, 22 insertions, 0 deletions
diff --git a/common/entities.js b/common/entities.js
index 74cad20..41d6e3b 100644
--- a/common/entities.js
+++ b/common/entities.js
@@ -116,6 +116,28 @@ function* get_used_files(item)
}
#EXPORT get_used_files AS get_files
+/*
+ * Regex to parse URIs like:
+ * https://hydrilla.koszko.org/schemas/api_mapping_description-2.schema.json
+ */
+const name_base_re = "(?<name_base>[^/]*)";
+const major_number_re = "(?<major>[1-9][0-9]*)";
+const minor_number_re = "(?:[1-9][0-9]*|0)";
+const numbers_rest_re = `(?:\\.${minor_number_re})*`;
+const version_re = `(?<ver>${major_number_re}${numbers_rest_re})`;
+const schema_name_re = `${name_base_re}-${version_re}\\.schema\\.json`;
+
+const haketilo_schema_name_regex = new RegExp(schema_name_re);
+#EXPORT haketilo_schema_name_regex
+
+/* Extract the number that indicates entity's compatibility mode. */
+function get_schema_major_version(instance) {
+ const match = haketilo_schema_name_regex.exec(instance.$schema);
+
+ return parseInt(match.groups.major);
+}
+#EXPORT get_schema_major_version
+
#IF NEVER
/*