From 52dcc6765af407da356333fdcab86ff56e987fb9 Mon Sep 17 00:00:00 2001
From: Karl Seguin <k@openmymind.io>
Date: Sat, 13 Dec 2025 12:47:54 +0800
Subject: [PATCH] URLSearchParams from FormData

---
 .../tests/legacy/url/url_search_params.html   |  1 -
 src/browser/tests/net/url_search_params.html  | 14 +++++++++++
 src/browser/webapi/URL.zig                    | 24 ++++++-------------
 src/browser/webapi/net/URLSearchParams.zig    |  5 +++-
 4 files changed, 25 insertions(+), 19 deletions(-)

diff --git a/src/browser/tests/legacy/url/url_search_params.html b/src/browser/tests/legacy/url/url_search_params.html
index 344f33cc..738253d2 100644
--- a/src/browser/tests/legacy/url/url_search_params.html
+++ b/src/browser/tests/legacy/url/url_search_params.html
@@ -81,7 +81,6 @@
 
   testing.expectEqual(3, ups.size);
   testing.expectEqual(['1', '2'], ups.getAll('a'));
-
   testing.expectEqual(['3'], ups.getAll('b'));
 
   fd.delete('a'); // the two aren't linked, it created a copy
diff --git a/src/browser/tests/net/url_search_params.html b/src/browser/tests/net/url_search_params.html
index 54b66b3d..74d7c03b 100644
--- a/src/browser/tests/net/url_search_params.html
+++ b/src/browser/tests/net/url_search_params.html
@@ -353,3 +353,17 @@
   testing.expectEqual(['a', 'a', 'b', 'b', 'c'], Array.from(usp.keys()));
 }
 </script>
+
+<script id=formData>
+  {
+    let fd = new FormData();
+    fd.append('a', '1');
+    fd.append('a', '2');
+    fd.append('b', '3');
+    ups = new URLSearchParams(fd);
+
+    testing.expectEqual(3, ups.size);
+    testing.expectEqual(['1', '2'], ups.getAll('a'));
+    testing.expectEqual(['3'], ups.getAll('b'));
+  }
+</script>
diff --git a/src/browser/webapi/URL.zig b/src/browser/webapi/URL.zig
index 766bd3c2..e886c8eb 100644
--- a/src/browser/webapi/URL.zig
+++ b/src/browser/webapi/URL.zig
@@ -35,23 +35,6 @@ _search_params: ?*URLSearchParams = null,
 pub const resolve = @import("../URL.zig").resolve;
 pub const eqlDocument = @import("../URL.zig").eqlDocument;
 
-pub fn canParse(url: []const u8, base_: ?[]const u8, page: *Page) bool {
-    _ = page;
-    const url_is_absolute = U.isCompleteHTTPUrl(url);
-
-    if (base_) |b| {
-        // Base must be valid even if URL is absolute
-        if (!U.isCompleteHTTPUrl(b)) {
-            return false;
-        }
-        return true;
-    } else if (!url_is_absolute) {
-        return false;
-    } else {
-        return true;
-    }
-}
-
 pub fn init(url: [:0]const u8, base_: ?[:0]const u8, page: *Page) !*URL {
     const url_is_absolute = @import("../URL.zig").isCompleteHTTPUrl(url);
 
@@ -238,6 +221,13 @@ pub fn toString(self: *const URL, page: *const Page) ![:0]const u8 {
     return buf.written()[0 .. buf.written().len - 1 :0];
 }
 
+pub fn canParse(url: []const u8, base_: ?[]const u8) bool {
+    if (base_) |b| {
+        return U.isCompleteHTTPUrl(b);
+    }
+    return U.isCompleteHTTPUrl(url);
+}
+
 pub const JsApi = struct {
     pub const bridge = js.Bridge(URL);
 
diff --git a/src/browser/webapi/net/URLSearchParams.zig b/src/browser/webapi/net/URLSearchParams.zig
index 2cfe3b2c..482c4c7f 100644
--- a/src/browser/webapi/net/URLSearchParams.zig
+++ b/src/browser/webapi/net/URLSearchParams.zig
@@ -24,8 +24,9 @@ const String = @import("../../../string.zig").String;
 const Allocator = std.mem.Allocator;
 
 const Page = @import("../../Page.zig");
-const GenericIterator = @import("../collections/iterator.zig").Entry;
+const FormData = @import("FormData.zig");
 const KeyValueList = @import("../KeyValueList.zig");
+const GenericIterator = @import("../collections/iterator.zig").Entry;
 
 const URLSearchParams = @This();
 
@@ -33,6 +34,7 @@ _arena: Allocator,
 _params: KeyValueList,
 
 const InitOpts = union(enum) {
+    form_data: *FormData,
     value: js.Value,
     query_string: []const u8,
 };
@@ -43,6 +45,7 @@ pub fn init(opts_: ?InitOpts, page: *Page) !*URLSearchParams {
         const opts = opts_ orelse break :blk .empty;
         switch (opts) {
             .query_string => |qs| break :blk try paramsFromString(arena, qs, &page.buf),
+            .form_data => |fd| break :blk try KeyValueList.copy(arena, fd._list),
             .value => |js_val| {
                 if (js_val.isObject()) {
                     break :blk try KeyValueList.fromJsObject(arena, js_val.toObject(), null, page);