From 91d1f539d4963b6422d5dfa73c0720b994352c7e Mon Sep 17 00:00:00 2001
From: Pierre Tachoire <pierre@lightpanda.io>
Date: Thu, 4 Jan 2024 15:16:48 +0100
Subject: [PATCH] HTMLDocument: implements anchors

---
 src/dom/html_collection.zig | 30 ++++++++++++++++++++++++++++++
 src/html/document.zig       |  5 +++++
 2 files changed, 35 insertions(+)

diff --git a/src/dom/html_collection.zig b/src/dom/html_collection.zig
index 1f04ae84..41e88299 100644
--- a/src/dom/html_collection.zig
+++ b/src/dom/html_collection.zig
@@ -16,6 +16,7 @@ const Matcher = union(enum) {
     matchByTagName: MatchByTagName,
     matchByClassName: MatchByClassName,
     matchByLinks: MatchByLinks,
+    matchByAnchors: MatchByAnchors,
     matchTrue: struct {},
     matchFalse: struct {},
 
@@ -27,6 +28,7 @@ const Matcher = union(enum) {
             inline .matchByClassName => |case| return case.match(node),
             inline .matchByName => |case| return case.match(node),
             inline .matchByLinks => return MatchByLinks.match(node),
+            inline .matchByAnchors => return MatchByAnchors.match(node),
         }
     }
 
@@ -38,6 +40,7 @@ const Matcher = union(enum) {
             inline .matchByClassName => |case| return case.deinit(alloc),
             inline .matchByName => |case| return case.deinit(alloc),
             inline .matchByLinks => return,
+            inline .matchByAnchors => return,
         }
     }
 };
@@ -213,6 +216,33 @@ pub fn HTMLCollectionByLinks(
     };
 }
 
+// MatchByAnchors matches the a elements in the Document that have name
+// attributes.
+// https://html.spec.whatwg.org/#dom-document-anchors
+pub const MatchByAnchors = struct {
+    pub fn match(node: *parser.Node) !bool {
+        const tag = try parser.nodeName(node);
+        if (!std.ascii.eqlIgnoreCase(tag, "a")) return false;
+
+        const elem = @as(*parser.Element, @ptrCast(node));
+        return parser.elementHasAttribute(elem, "name");
+    }
+};
+
+pub fn HTMLCollectionByAnchors(
+    root: ?*parser.Node,
+    include_root: bool,
+) !HTMLCollection {
+    return HTMLCollection{
+        .root = root,
+        .walker = Walker{ .walkerDepthFirst = .{} },
+        .matcher = Matcher{
+            .matchByAnchors = MatchByAnchors{},
+        },
+        .include_root = include_root,
+    };
+}
+
 const Walker = union(enum) {
     walkerDepthFirst: WalkerDepthFirst,
     walkerChildren: WalkerChildren,
diff --git a/src/html/document.zig b/src/html/document.zig
index bc182af4..4fb05692 100644
--- a/src/html/document.zig
+++ b/src/html/document.zig
@@ -134,6 +134,10 @@ pub const HTMLDocument = struct {
         return try collection.HTMLCollectionByLinks(try rootNode(self), false);
     }
 
+    pub fn get_anchors(self: *parser.DocumentHTML) !collection.HTMLCollection {
+        return try collection.HTMLCollectionByAnchors(try rootNode(self), false);
+    }
+
     pub fn get_currentScript(_: *parser.DocumentHTML) !?*parser.Element {
         return null;
     }
@@ -177,6 +181,7 @@ pub fn testExecFn(
         .{ .src = "document.forms.length", .ex = "0" },
         .{ .src = "document.links.length", .ex = "1" },
         .{ .src = "document.applets.length", .ex = "0" },
+        .{ .src = "document.anchors.length", .ex = "0" },
         .{ .src = "document.currentScript", .ex = "null" },
     };
     try checkCases(js_env, &getters);