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std.Build.Cache.Path: add subPathOpt and TableAdapter

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Helpful methods when using one of these structs as a hash table key.
This commit is contained in:
Andrew Kelley 2024-07-08 23:41:08 -07:00
parent 6c64090e7a
commit deea36250f
1 changed files with 20 additions and 0 deletions
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20
lib/std/Build/Cache/Path.zig
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@ -151,6 +151,26 @@ pub fn eql(self: Path, other: Path) bool {
return self.root_dir.eql(other.root_dir) and std.mem.eql(u8, self.sub_path, other.sub_path);
}
pub fn subPathOpt(self: Path) ?[]const u8 {
return if (self.sub_path.len == 0) null else self.sub_path;
}
/// Useful to make `Path` a key in `std.ArrayHashMap`.
pub const TableAdapter = struct {
pub const Hash = std.hash.Wyhash;
pub fn hash(self: TableAdapter, a: Cache.Path) u32 {
_ = self;
const seed: u32 = @bitCast(a.root_dir.handle.fd);
return @truncate(Hash.hash(seed, a.sub_path));
}
pub fn eql(self: TableAdapter, a: Cache.Path, b: Cache.Path, b_index: usize) bool {
_ = self;
_ = b_index;
return a.eql(b);
}
};
const Path = @This();
const std = @import("../../std.zig");
const fs = std.fs;