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20 lines
669 B
20 lines
669 B
3 years ago
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import LRUCache from './LRUCache.js'
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// A cache for frequently used country-specific regular expressions. Set to 32 to cover ~2-3
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// countries being used for the same doc with ~10 patterns for each country. Some pages will have
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// a lot more countries in use, but typically fewer numbers for each so expanding the cache for
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// that use-case won't have a lot of benefit.
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export default class RegExpCache {
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constructor(size) {
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this.cache = new LRUCache(size)
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}
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getPatternForRegExp(pattern) {
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let regExp = this.cache.get(pattern)
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if (!regExp) {
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regExp = new RegExp('^' + pattern)
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this.cache.put(pattern, regExp)
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}
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return regExp
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}
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}
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