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const std = @import("std");
const Allocator = std.mem.Allocator;
const Arena = std.heap.ArenaAllocator;
const Element = @import("Element.zig");
const Node = Element.Node;
const Error = Element.Error;
content: std.DoublyLinkedList = .{},
arena: Arena,
node: Node = .{
.ptr = undefined,
.vtable = .{ .element = fromNode },
},
const Self = @This();
pub fn init(parent: Allocator) Error!*Self {
var s = Self{ .arena = .init(parent) };
var alloc = s.arena.allocator();
const v = try alloc.create(Self);
v.* = s;
v.node.ptr = v;
return v;
}
pub fn deinit(self: *Self) void {
self.arena.deinit();
}
pub fn element(self: *Self) Element {
return (Element.Wrapper(Self){ .ptr = self }).element();
}
pub fn allocator(self: *Self) Allocator {
return self.arena.allocator();
}
pub fn append(self: *Self, raw: anytype) Error!void {
const el: Element = blk: {
const T = @TypeOf(raw);
if (T == Element) break :blk raw;
if (@hasDecl(T, "html")) break :blk try raw.html(self.allocator());
@compileError("cannot convert " ++ @typeName(T) ++ " into " ++ @typeName(Element));
};
self.content.append(&el.node().node);
}
fn fromNode(context: *anyopaque) Element {
const self: *Self = @ptrCast(@alignCast(context));
return self.element();
}
pub fn render(self: *Self, alloc: Allocator) Error![]const u8 {
if (self.content.first == null) return "";
var acc = try std.ArrayList(u8).initCapacity(alloc, 8);
errdefer acc.deinit(alloc);
var arena = Arena.init(alloc);
defer arena.deinit();
var v = self.content.first;
while (v) |it| : (v = it.next) try acc.appendSlice(alloc, try Node.from(it).render(arena.allocator()));
return acc.toOwnedSlice(alloc);
}
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