text: add splitText method

Signed-off-by: Francis Bouvier <francis.bouvier@gmail.com>

src/dom/text.zig

@@ -21,6 +21,13 @@ pub const Text = struct {
     pub fn get_wholeText(self: *parser.Text) []const u8 {
         return parser.textWholdeText(self);
     }
+
+    // JS methods
+    // ----------
+
+    pub fn _splitText(self: *parser.Text, offset: u32) *parser.Text {
+        return parser.textSplitText(self, offset);
+    }
 };
 
 // Tests
@@ -36,4 +43,12 @@ pub fn testExecFn(
         .{ .src = "text.wholeText === 'OK'", .ex = "true" },
     };
     try checkCases(js_env, &get_whole_text);
+
+    var split_text = [_]Case{
+        .{ .src = "text.data = 'OK modified'", .ex = "OK modified" },
+        .{ .src = "let split = text.splitText('OK'.length)", .ex = "undefined" },
+        .{ .src = "split.data === ' modified'", .ex = "true" },
+        .{ .src = "text.data === 'OK'", .ex = "true" },
+    };
+    try checkCases(js_env, &split_text);
 }

src/netsurf.zig

@@ -513,6 +513,12 @@ pub fn textWholdeText(text: *Text) []const u8 {
     return stringToData(s.?);
 }
 
+pub fn textSplitText(text: *Text, offset: u32) *Text {
+    var res: ?*Text = undefined;
+    _ = textVtable(text).dom_text_split_text.?(text, offset, &res);
+    return res.?;
+}
+
 // Comment
 pub const Comment = c.dom_comment;