32 lines
1001 B
Kotlin
32 lines
1001 B
Kotlin
package jp.juggler.emoji
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import androidx.collection.SparseArrayCompat
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class EmojiTrie<T> {
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data class Result<T>(val data: T, val endPos: Int)
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var data: T? = null
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val map = SparseArrayCompat<EmojiTrie<T>>()
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fun append(src: String, offset: Int, data: T) {
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if (offset >= src.length) {
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if (this.data != null) error("EmojiTrie.append: duplicate: $src")
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this.data = data
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return
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}
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val c = src[offset].toInt()
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val next = map[c] ?: EmojiTrie<T>().also { map.put(c, it) }
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next.append(src, offset + 1, data)
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}
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fun hasNext(c: Char) = map.containsKey(c.toInt())
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fun get(src: String, offset: Int, end: Int): Result<T>? {
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// 長い方を優先するので、先に子を調べる
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if (offset < end)
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map[src[offset].toInt()]?.get(src, offset + 1, end)
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?.let { return it }
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return this.data?.let { Result(it, offset) }
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}
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} |