perf(eval): reduce memory syscall

1 files changed, 53 insertions, 0 deletions

diff --git a/src/eval/Root.zig b/src/eval/Root.zig
new file mode 100644
index 0000000..1834dd0
--- /dev/null
+++ b/src/eval/Root.zig
@@ -0,0 +1,53 @@
+const std = @import("std");
+const Allocator = std.mem.Allocator;
+const Arena = std.heap.ArenaAllocator;
+const HTML = @import("html/Element.zig");
+const Element = @import("Element.zig");
+
+const Self = @This();
+
+content: std.ArrayList(Element),
+arena: Arena,
+
+pub fn init(parent: Allocator) !*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 allocator(self: *Self) Allocator {
+    return self.arena.allocator();
+}
+
+pub fn append(self: *Self, el: Element) !void {
+    try self.content.append(self.allocator(), el);
+}
+
+pub fn element(self: *Self) Element {
+    return .{ .vtable = .{ .html = html }, .ptr = self };
+}
+
+pub fn renderHTML(self: *Self, alloc: Allocator) HTML.Error![]const u8 {
+    return try self.element().renderHTML(alloc);
+}
+
+fn html(context: *anyopaque, alloc: Allocator) HTML.Error!HTML {
+    const self: *Self = @ptrCast(@alignCast(context));
+    const el = try HTML.Root.init(alloc);
+    errdefer el.deinit();
+    if (self.content.items.len == 0) return el.element();
+    for (self.content.items) |it| {
+        try el.append(try it.html(el.allocator()));
+    }
+    return el.element();
+}