feat(hamt): properly implement search
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@ -66,14 +66,13 @@ pub fn search(self: *HashArrayMappedTrie, key: []const u8) ?Pair {
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while (true) {
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switch (current.*) {
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.table => |table| {
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hash_offset += t;
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const mask = @as(u32, 1) << amtIdx(u32, bitset, hash_offset);
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if (table.map & mask != 0) {
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const idx = @popCount(table.map & (mask - 1));
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current = &table.base[idx];
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hash_offset += t;
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} else return null; // hash table entry is empty
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},
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.kv => |pair| {
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@ -218,17 +217,22 @@ test "search doesn't panic" {
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std.debug.assert(trie.search("hello") == null);
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}
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test "insert then search" {
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test "insert edge cases" {
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var trie = try HashArrayMappedTrie.init(std.heap.page_allocator);
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defer trie.deinit();
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// Basic Usage
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try trie.insert("hello", {});
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const test1 = trie.search("hello").?;
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try std.testing.expectEqual(Pair{ .key = "hello", .value = {} }, test1);
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try trie.insert("world", {});
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try trie.insert("zywxv", {});
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// Collision in Root Node
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try trie.insert("helloworld", {});
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const test2 = trie.search("helloworld").?;
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try std.testing.expectEqual(Pair{ .key = "helloworld", .value = {} }, test2);
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// Colliding Keys
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try trie.insert("abcde", {});
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try trie.insert("abcdef", {});
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trie.walk();
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try std.testing.expectEqual(Pair{ .key = "hello", .value = {} }, trie.search("hello").?);
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// try std.testing.expectEqual(Pair{ .key = "abcde", .value = {} }, trie.search("abcde").?);
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}
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