89 lines
2.5 KiB
Zig
89 lines
2.5 KiB
Zig
const std = @import("index.zig");
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const HashMap = std.HashMap;
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const mem = std.mem;
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const Allocator = mem.Allocator;
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const assert = std.debug.assert;
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/// BufMap copies keys and values before they go into the map, and
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/// frees them when they get removed.
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pub const BufMap = struct {
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hash_map: BufMapHashMap,
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const BufMapHashMap = HashMap([]const u8, []const u8, mem.hash_slice_u8, mem.eql_slice_u8);
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pub fn init(allocator: *Allocator) BufMap {
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var self = BufMap{ .hash_map = BufMapHashMap.init(allocator) };
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return self;
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}
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pub fn deinit(self: *const BufMap) void {
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var it = self.hash_map.iterator();
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while (true) {
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const entry = it.next() ?? break;
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self.free(entry.key);
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self.free(entry.value);
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}
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self.hash_map.deinit();
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}
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pub fn set(self: *BufMap, key: []const u8, value: []const u8) !void {
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self.delete(key);
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const key_copy = try self.copy(key);
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errdefer self.free(key_copy);
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const value_copy = try self.copy(value);
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errdefer self.free(value_copy);
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_ = try self.hash_map.put(key_copy, value_copy);
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}
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pub fn get(self: *const BufMap, key: []const u8) ?[]const u8 {
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const entry = self.hash_map.get(key) ?? return null;
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return entry.value;
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}
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pub fn delete(self: *BufMap, key: []const u8) void {
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const entry = self.hash_map.remove(key) ?? return;
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self.free(entry.key);
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self.free(entry.value);
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}
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pub fn count(self: *const BufMap) usize {
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return self.hash_map.count();
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}
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pub fn iterator(self: *const BufMap) BufMapHashMap.Iterator {
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return self.hash_map.iterator();
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}
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fn free(self: *const BufMap, value: []const u8) void {
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self.hash_map.allocator.free(value);
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}
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fn copy(self: *const BufMap, value: []const u8) ![]const u8 {
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return mem.dupe(self.hash_map.allocator, u8, value);
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}
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};
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test "BufMap" {
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var direct_allocator = std.heap.DirectAllocator.init();
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defer direct_allocator.deinit();
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var bufmap = BufMap.init(&direct_allocator.allocator);
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defer bufmap.deinit();
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try bufmap.set("x", "1");
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assert(mem.eql(u8, ??bufmap.get("x"), "1"));
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assert(1 == bufmap.count());
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try bufmap.set("x", "2");
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assert(mem.eql(u8, ??bufmap.get("x"), "2"));
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assert(1 == bufmap.count());
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try bufmap.set("x", "3");
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assert(mem.eql(u8, ??bufmap.get("x"), "3"));
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assert(1 == bufmap.count());
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bufmap.delete("x");
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assert(0 == bufmap.count());
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}
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