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'use strict';
const LRU = require('lru-cache').default;
const parserCache = new LRU({
max: 15000,
});
function keyFromFields(type, fields, options, config) {
const res = [
type,
typeof options.nestTables,
options.nestTables,
Boolean(options.rowsAsArray),
Boolean(options.supportBigNumbers || config.supportBigNumbers),
Boolean(options.bigNumberStrings || config.bigNumberStrings),
typeof options.typeCast,
options.timezone || config.timezone,
Boolean(options.decimalNumbers),
options.dateStrings,
];
for (let i = 0; i < fields.length; ++i) {
const field = fields[i];
res.push([
field.name,
field.columnType,
field.length,
field.schema,
field.table,
field.flags,
field.characterSet,
]);
}
return JSON.stringify(res, null, 0);
}
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.clear();
}
module.exports = {
getParser: getParser,
setMaxCache: setMaxCache,
clearCache: clearCache,
_keyFromFields: keyFromFields,
};
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