Adds support for input element's maxlength attr

servo/servo#7320
servo/servo#7004

tests/unit/script/textinput.rs

@@ -13,11 +13,111 @@ use msg::constellation_msg::CONTROL;
 use msg::constellation_msg::SUPER;
 use msg::constellation_msg::{Key, KeyModifiers};
 use script::clipboard_provider::DummyClipboardContext;
-use script::textinput::{TextInput, Selection, Lines, Direction};
+use script::textinput::{TextInput, TextPoint, Selection, Lines, Direction};
 use util::str::DOMString;
 
 fn text_input(lines: Lines, s: &str) -> TextInput<DummyClipboardContext> {
-    TextInput::new(lines, DOMString::from(s), DummyClipboardContext::new(""))
+    TextInput::new(lines, DOMString::from(s), DummyClipboardContext::new(""), None)
+}
+
+#[test]
+fn test_textinput_when_inserting_multiple_lines_over_a_selection_respects_max_length() {
+    let mut textinput = TextInput::new(
+        Lines::Multiple,
+        DOMString::from("hello\nworld"),
+        DummyClipboardContext::new(""),
+        Some(17)
+    );
+
+    textinput.edit_point = TextPoint { line: 0, index: 1 };
+    textinput.adjust_horizontal(3, Selection::Selected);
+    textinput.adjust_vertical(1, Selection::Selected);
+
+    // Selection is now "hello\n
+    //                    ------
+    //                   world"
+    //                   ----
+
+    textinput.insert_string("cruel\nterrible\nbad".to_string());
+
+    assert_eq!(textinput.get_content(), "hcruel\nterrible\nd");
+}
+
+#[test]
+fn test_textinput_when_inserting_multiple_lines_still_respects_max_length() {
+    let mut textinput = TextInput::new(
+        Lines::Multiple,
+        DOMString::from("hello\nworld"),
+        DummyClipboardContext::new(""),
+        Some(17)
+    );
+
+    textinput.edit_point = TextPoint { line: 1, index: 0 };
+
+    textinput.insert_string("cruel\nterrible".to_string());
+
+    assert_eq!(textinput.get_content(), "hello\ncruel\nworld");
+}
+
+#[test]
+fn test_textinput_when_content_is_already_longer_than_max_length_and_theres_no_selection_dont_insert_anything() {
+    let mut textinput = TextInput::new(
+        Lines::Single,
+        DOMString::from("abc"),
+        DummyClipboardContext::new(""),
+        Some(1)
+    );
+
+    textinput.insert_char('a');
+
+    assert_eq!(textinput.get_content(), "abc");
+}
+
+#[test]
+fn test_multi_line_textinput_with_maxlength_doesnt_allow_appending_characters_when_input_spans_lines() {
+    let mut textinput = TextInput::new(
+        Lines::Multiple,
+        DOMString::from("abc\nd"),
+        DummyClipboardContext::new(""),
+        Some(5)
+    );
+
+    textinput.insert_char('a');
+
+    assert_eq!(textinput.get_content(), "abc\nd");
+}
+
+#[test]
+fn test_single_line_textinput_with_max_length_doesnt_allow_appending_characters_when_replacing_a_selection() {
+    let mut textinput = TextInput::new(
+        Lines::Single,
+        DOMString::from("abcde"),
+        DummyClipboardContext::new(""),
+        Some(5)
+    );
+
+    textinput.edit_point = TextPoint { line: 0, index: 1 };
+    textinput.adjust_horizontal(3, Selection::Selected);
+
+    // Selection is now "abcde"
+    //                    ---
+
+    textinput.replace_selection(DOMString::from("too long"));
+
+    assert_eq!(textinput.get_content(), "atooe");
+}
+
+#[test]
+fn test_single_line_textinput_with_max_length_doesnt_allow_appending_characters_after_max_length_is_reached() {
+    let mut textinput = TextInput::new(
+        Lines::Single,
+        DOMString::from("a"),
+        DummyClipboardContext::new(""),
+        Some(1)
+    );
+
+    textinput.insert_char('b');
+    assert_eq!(textinput.get_content(), "a");
 }
 
 #[test]
@@ -199,7 +299,8 @@ fn test_clipboard_paste() {
 
     let mut textinput = TextInput::new(Lines::Single,
                                        DOMString::from("defg"),
-                                       DummyClipboardContext::new("abc"));
+                                       DummyClipboardContext::new("abc"),
+                                       None);
     assert_eq!(textinput.get_content(), "defg");
     assert_eq!(textinput.edit_point.index, 0);
     textinput.handle_keydown_aux(Key::V, MODIFIERS);