35 lines
773 B
Go
35 lines
773 B
Go
package token
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// StringSet is a useful type for looking up strings.
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type stringSet map[string]struct{}
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// NewStringSet creates a new StringSet with the given strings.
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func newStringSet(keys ...string) stringSet {
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ss := make(stringSet, len(keys))
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ss.add(keys...)
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return ss
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}
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// Add inserts the given keys into this StringSet.
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func (ss stringSet) add(keys ...string) {
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for _, key := range keys {
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ss[key] = struct{}{}
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}
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}
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// Contains returns whether the given key is in this StringSet.
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func (ss stringSet) contains(key string) bool {
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_, ok := ss[key]
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return ok
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}
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// Keys returns a slice of all keys in this StringSet.
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func (ss stringSet) keys() []string {
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keys := make([]string, 0, len(ss))
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for key := range ss {
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keys = append(keys, key)
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}
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return keys
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}
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