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const std = @import("std");
const Rc = @import("./rc.zig").Rc;
pub const ValueKind = enum {
null,
bool,
integer,
float,
string,
array,
object,
};
pub const Value = union(ValueKind) {
null: void,
bool: bool,
integer: i64,
float: f64,
string: []const u8,
array: Array,
object: Object,
pub const @"true": Value = .{ .bool = true };
pub const @"false": Value = .{ .bool = false };
pub fn initBool(b: bool) Value {
return .{ .bool = b };
}
pub fn initInteger(i: i64) Value {
return .{ .integer = i };
}
pub fn initFloat(f: f64) Value {
return .{ .float = f };
}
pub fn initString(s: []const u8) Value {
return .{ .string = s };
}
pub fn initArray(arr: Array) Value {
return .{ .array = arr };
}
pub fn initObject(obj: Object) Value {
return .{ .object = obj };
}
pub fn kind(self: Value) ValueKind {
return self;
}
pub fn clone(self: Value) Value {
return switch (self) {
.array => |a| .{ .array = a.clone() },
.object => |o| .{ .object = o.clone() },
else => self,
};
}
pub fn deinit(self: Value, allocator: std.mem.Allocator) void {
switch (self) {
.array => |a| a.deinit(allocator),
.object => |o| o.deinit(allocator),
else => {},
}
}
pub fn arrayAppend(self: *Value, allocator: std.mem.Allocator, item: Value) !void {
try self.array.append(allocator, item);
}
pub fn jsonStringify(self: Value, jws: anytype) !void {
switch (self) {
.null => try jws.write(null),
.bool => |b| try jws.write(b),
.integer => |i| try jws.write(i),
.float => |f| try jws.write(f),
.string => |s| try jws.write(s),
.array => |a| {
try jws.beginArray();
for (0..a.len()) |i| {
try a.get(i).jsonStringify(jws);
}
try jws.endArray();
},
.object => |o| {
try jws.beginObject();
var it = o.iterator();
while (it.next()) |entry| {
try jws.objectField(entry.key_ptr.*);
try entry.value_ptr.jsonStringify(jws);
}
try jws.endObject();
},
}
}
};
pub const Array = struct {
const Inner = std.ArrayList(Value);
rc: Rc(Inner),
pub fn init(allocator: std.mem.Allocator) !Array {
return .{ .rc = try Rc(Inner).init(allocator, .{}) };
}
pub fn clone(self: Array) Array {
return .{ .rc = self.rc.retain() };
}
pub fn deinit(self: Array, allocator: std.mem.Allocator) void {
if (self.rc.isUnique()) {
for (self.rc.get().items) |item| {
item.deinit(allocator);
}
self.rc.get().deinit(allocator);
}
self.rc.release(allocator);
}
pub fn get(self: Array, idx: usize) Value {
const items = self.rc.get().items;
if (idx < items.len) {
return items[idx];
}
return Value.null;
}
pub fn len(self: Array) usize {
return self.rc.get().items.len;
}
pub fn append(self: *Array, allocator: std.mem.Allocator, value: Value) !void {
try self.ensureUnique(allocator);
try self.rc.get().append(allocator, value);
}
fn ensureUnique(self: *Array, allocator: std.mem.Allocator) !void {
if (!self.rc.isUnique()) {
const old_items = self.rc.get().items;
var new_inner: Inner = .{};
try new_inner.ensureTotalCapacity(allocator, old_items.len);
for (old_items) |item| {
new_inner.appendAssumeCapacity(item.clone());
}
self.rc.release(allocator);
self.rc = try Rc(Inner).init(allocator, new_inner);
}
}
};
pub const Object = struct {
const Inner = std.StringArrayHashMapUnmanaged(Value);
rc: Rc(Inner),
pub fn init(allocator: std.mem.Allocator) !Object {
return .{ .rc = try Rc(Inner).init(allocator, .{}) };
}
pub fn clone(self: Object) Object {
return .{ .rc = self.rc.retain() };
}
pub fn deinit(self: Object, allocator: std.mem.Allocator) void {
if (self.rc.isUnique()) {
for (self.rc.get().values()) |v| {
v.deinit(allocator);
}
self.rc.get().deinit(allocator);
}
self.rc.release(allocator);
}
pub fn get(self: Object, key: []const u8) ?Value {
return self.rc.get().get(key);
}
pub fn set(self: *Object, allocator: std.mem.Allocator, key: []const u8, value: Value) !void {
try self.ensureUnique(allocator);
try self.rc.get().put(allocator, key, value);
}
pub fn count(self: Object) usize {
return self.rc.get().count();
}
pub fn iterator(self: Object) Inner.Iterator {
return self.rc.get().iterator();
}
fn ensureUnique(self: *Object, allocator: std.mem.Allocator) !void {
if (!self.rc.isUnique()) {
const old = self.rc.get();
var new_inner: Inner = .{};
try new_inner.ensureTotalCapacity(allocator, old.count());
var it = old.iterator();
while (it.next()) |entry| {
new_inner.putAssumeCapacity(entry.key_ptr.*, entry.value_ptr.clone());
}
self.rc.release(allocator);
self.rc = try Rc(Inner).init(allocator, new_inner);
}
}
};
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