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node_modules/mysql2/lib/parsers/parser_cache.js

@@ -0,0 +1,59 @@
+'use strict';
+
+const LRU = require('lru-cache');
+
+const parserCache = new LRU({
+  max: 15000
+});
+
+function keyFromFields(type, fields, options, config) {
+  let res =
+    `${type}` +
+    `/${typeof options.nestTables}` +
+    `/${options.nestTables}` +
+    `/${options.rowsAsArray}` +
+    `/${options.supportBigNumbers || config.supportBigNumbers}` +
+    `/${options.bigNumberStrings || config.bigNumberStrings}` +
+    `/${typeof options.typeCast}` +
+    `/${options.timezone || config.timezone}` +
+    `/${options.decimalNumbers}` +
+    `/${options.dateStrings}`;
+  for (let i = 0; i < fields.length; ++i) {
+    const field = fields[i];
+    res += `/${field.name}:${field.columnType}:${field.flags}:${
+      field.characterSet
+    }`;
+
+    if (options.nestTables) {
+      res += `:${field.table}`
+    }
+  }
+  return res;
+}
+
+function getParser(type, fields, options, config, compiler) {
+  const key = keyFromFields(type, fields, options, config);
+  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
+};