Initial import from local backup (Documents-Playground/pakerpale)

node_modules/mysql2/lib/parsers/parser_cache.js

@@ -0,0 +1,55 @@
+'use strict';
+
+const LRU = require('lru-cache');
+
+const parserCache = new LRU({
+  max: 15000
+});
+
+function keyFromFields(type, fields, options) {
+  let res =
+    type +
+    '/' +
+    typeof options.nestTables +
+    '/' +
+    options.nestTables +
+    '/' +
+    options.rowsAsArray +
+    options.supportBigNumbers +
+    '/' +
+    options.bigNumberStrings +
+    '/' +
+    typeof options.typeCast;
+  for (let i = 0; i < fields.length; ++i) {
+    res +=
+      '/' + fields[i].name + ':' + fields[i].columnType + ':' + fields[i].flags;
+  }
+  return res;
+}
+
+function getParser(type, fields, options, config, compiler) {
+  const key = keyFromFields(type, fields, options);
+  let parser = parserCache.get(key);
+
+  if (parser) {
+    return parser;
+  }
+
+  parser = compiler(fields, options, config);
+  parserCache.set(key, parser);
+  return parser;
+}
+
+function setMaxCache(max) {
+  parserCache.max = max;
+}
+
+function clearCache() {
+  parserCache.reset();
+}
+
+module.exports = {
+  getParser: getParser,
+  setMaxCache: setMaxCache,
+  clearCache: clearCache
+};