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const std = @import("std");
const Allocator = std.mem.Allocator;
const Arena = std.heap.ArenaAllocator;
const List = std.ArrayList;
const Element = @import("Element.zig");
const Error = Element.Error;
content: List(Element),
arena: Arena,
const Self = @This();
pub fn init(parent: Allocator) Error!*Self {
var s = Self{
.content = undefined,
.arena = .init(parent),
};
var alloc = s.arena.allocator();
s.content = try .initCapacity(alloc, 2);
const v = try alloc.create(Self);
v.* = s;
return v;
}
pub fn deinit(self: *Self) void {
self.arena.deinit();
}
pub fn element(self: *Self) Element {
return .{ .vtable = .{ .render = Self.render, }, .ptr = self };
}
pub fn allocator(self: *Self) Allocator {
return self.arena.allocator();
}
pub fn append(self: *Self, el: Element) Error!void {
try self.content.append(self.allocator(), el);
}
fn render(context: *anyopaque, alloc: Allocator) Error![]const u8 {
const self: *Self = @ptrCast(@alignCast(context));
if (self.content.items.len == 0) return "";
var acc = try List(u8).initCapacity(alloc, self.content.items.len);
errdefer acc.deinit(alloc);
var arena = Arena.init(alloc);
defer arena.deinit();
for (self.content.items) |it| {
const res = try it.render(arena.allocator());
try acc.appendSlice(alloc, res);
}
return acc.toOwnedSlice(alloc);
}
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