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package main

import "sync"

var (
	stringCache      map[string]string
	stringCacheMu    sync.Mutex
	stringCacheTotal int // allows to calculate efficiency
)

// internString ensures there's only one string instance for a given s.
// Should only be used for strings that you believe have multiple copies.
// It saves memory in that case. If used for mostly unique strings, it'll
// create overhead
func internString(s string) string {
	if len(s) == 0 {
		return s
	}
	stringCacheMu.Lock()
	defer stringCacheMu.Unlock()
	if stringCache == nil {
		stringCache = make(map[string]string)
	}
	stringCacheTotal++
	res, ok := stringCache[s]
	if ok {
		return res
	}
	stringCache[s] = s
	return s
}