dom: add HTMLCollectionIterator

src/dom/html_collection.zig

@@ -338,6 +338,34 @@ pub const WalkerNone = struct {
     }
 };
 
+pub const HTMLCollectionIterator = struct {
+    pub const mem_guarantied = true;
+
+    coll: *HTMLCollection,
+    index: u32 = 0,
+
+    pub const Return = struct {
+        value: ?Union,
+        done: bool,
+    };
+
+    pub fn _next(self: *HTMLCollectionIterator, allocator: std.mem.Allocator) !Return {
+        const e = try self.coll._item(allocator, self.index);
+        if (e == null) {
+            return Return{
+                .value = null,
+                .done = true,
+            };
+        }
+
+        self.index += 1;
+        return Return{
+            .value = e,
+            .done = false,
+        };
+    }
+};
+
 // WEB IDL https://dom.spec.whatwg.org/#htmlcollection
 // HTMLCollection is re implemented in zig here because libdom
 // dom_html_collection expects a comparison function callback as arguement.
@@ -370,6 +398,12 @@ pub const HTMLCollection = struct {
         return try self.walker.get_next(self.root.?, null);
     }
 
+    pub fn _symbol_iterator(self: *HTMLCollection) HTMLCollectionIterator {
+        return HTMLCollectionIterator{
+            .coll = self,
+        };
+    }
+
     /// get_length computes the collection's length dynamically according to
     /// the current root structure.
     // TODO: nodes retrieved must be de-referenced.

src/dom/node.zig

@@ -19,6 +19,7 @@ const Document = @import("document.zig").Document;
 const DocumentType = @import("document_type.zig").DocumentType;
 const DocumentFragment = @import("document_fragment.zig").DocumentFragment;
 const HTMLCollection = @import("html_collection.zig").HTMLCollection;
+const HTMLCollectionIterator = @import("html_collection.zig").HTMLCollectionIterator;
 
 // HTML
 const HTML = @import("../html/html.zig");
@@ -34,6 +35,7 @@ pub const Interfaces = generate.Tuple(.{
     DocumentType,
     DocumentFragment,
     HTMLCollection,
+    HTMLCollectionIterator,
 
     HTML.Interfaces,
 });