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intern.zig
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intern.zig
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const std = @import("std");
pub const InternedString = struct {
ptr: [*]const u8,
len: u32,
pub fn slice(self: InternedString) []const u8 {
return self.ptr[0..self.len];
}
pub fn eql(a: InternedString, b: InternedString) bool {
return a.ptr == b.ptr and a.len == b.len;
}
pub fn hash(self: InternedString) u64 {
return @intFromPtr(self.ptr);
}
pub const empty: InternedString = .{ .ptr = "", .len = 0 };
};
pub const StringPool = struct {
allocator: std.mem.Allocator,
strings: std.StringHashMap(InternedString),
storage: std.ArrayListUnmanaged([]const u8),
pub fn init(allocator: std.mem.Allocator) StringPool {
return .{
.allocator = allocator,
.strings = std.StringHashMap(InternedString).init(allocator),
.storage = std.ArrayListUnmanaged([]const u8){},
};
}
pub fn deinit(self: *StringPool) void {
for (self.storage.items) |s| {
self.allocator.free(s);
}
self.storage.deinit(self.allocator);
self.strings.deinit();
}
pub fn intern(self: *StringPool, str: []const u8) !InternedString {
if (str.len == 0) return InternedString.empty;
if (self.strings.get(str)) |interned| return interned;
const owned = try self.allocator.dupe(u8, str);
errdefer self.allocator.free(owned);
try self.storage.append(self.allocator, owned);
const interned = InternedString{
.ptr = owned.ptr,
.len = @intCast(owned.len),
};
try self.strings.put(owned, interned);
return interned;
}
pub fn internOwned(self: *StringPool, owned: []const u8) !InternedString {
if (owned.len == 0) return InternedString.empty;
if (self.strings.get(owned)) |interned| {
self.allocator.free(@constCast(owned));
return interned;
}
try self.storage.append(self.allocator, owned);
const interned = InternedString{
.ptr = owned.ptr,
.len = @intCast(owned.len),
};
try self.strings.put(owned, interned);
return interned;
}
pub fn stats(self: *const StringPool) Stats {
var total_bytes: usize = 0;
for (self.storage.items) |s| {
total_bytes += s.len;
}
return .{
.string_count = self.storage.items.len,
.total_bytes = total_bytes,
};
}
pub const Stats = struct {
string_count: usize,
total_bytes: usize,
};
};
pub const CommonStrings = struct {
pool: *StringPool,
lodash: InternedString = InternedString.empty,
react: InternedString = InternedString.empty,
typescript: InternedString = InternedString.empty,
webpack: InternedString = InternedString.empty,
babel: InternedString = InternedString.empty,
eslint: InternedString = InternedString.empty,
jest: InternedString = InternedString.empty,
express: InternedString = InternedString.empty,
caret: InternedString = InternedString.empty, // ^
tilde: InternedString = InternedString.empty, // ~
pub fn init(pool: *StringPool) !CommonStrings {
return .{
.pool = pool,
.lodash = try pool.intern("lodash"),
.react = try pool.intern("react"),
.typescript = try pool.intern("typescript"),
.webpack = try pool.intern("webpack"),
.babel = try pool.intern("@babel/core"),
.eslint = try pool.intern("eslint"),
.jest = try pool.intern("jest"),
.express = try pool.intern("express"),
.caret = try pool.intern("^"),
.tilde = try pool.intern("~"),
};
}
};

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