Makes layout respect <textarea> cols attribute

components/script/dom/element.rs

@@ -19,7 +19,7 @@ use dom::bindings::codegen::InheritTypes::{ElementCast, ElementDerived, EventTar
 use dom::bindings::codegen::InheritTypes::{HTMLBodyElementDerived, HTMLInputElementCast};
 use dom::bindings::codegen::InheritTypes::{HTMLInputElementDerived, HTMLTableElementCast};
 use dom::bindings::codegen::InheritTypes::{HTMLTableElementDerived, HTMLTableCellElementDerived};
-use dom::bindings::codegen::InheritTypes::{HTMLTableRowElementDerived};
+use dom::bindings::codegen::InheritTypes::{HTMLTableRowElementDerived, HTMLTextAreaElementDerived};
 use dom::bindings::codegen::InheritTypes::{HTMLTableSectionElementDerived, NodeCast};
 use dom::bindings::js::{MutNullableJS, JS, JSRef, Temporary, TemporaryPushable};
 use dom::bindings::js::{OptionalRootable, Root};
@@ -41,6 +41,7 @@ use dom::htmltableelement::{HTMLTableElement, HTMLTableElementHelpers};
 use dom::htmltablecellelement::{HTMLTableCellElement, HTMLTableCellElementHelpers};
 use dom::htmltablerowelement::{HTMLTableRowElement, HTMLTableRowElementHelpers};
 use dom::htmltablesectionelement::{HTMLTableSectionElement, HTMLTableSectionElementHelpers};
+use dom::htmltextareaelement::{HTMLTextAreaElement, RawLayoutHTMLTextAreaElementHelpers};
 use dom::node::{CLICK_IN_PROGRESS, ElementNodeTypeId, LayoutNodeHelpers, Node, NodeHelpers};
 use dom::node::{NodeIterator, NodeStyleDamaged, OtherNodeDamage, document_from_node};
 use dom::node::{window_from_node};
@@ -49,7 +50,7 @@ use dom::virtualmethods::{VirtualMethods, vtable_for};
 use devtools_traits::AttrInfo;
 use style::{mod, AuthorOrigin, BgColorSimpleColorAttribute, BorderUnsignedIntegerAttribute};
 use style::{ColSpanUnsignedIntegerAttribute, IntegerAttribute, LengthAttribute, ParserContext};
-use style::{SimpleColorAttribute, SizeIntegerAttribute, UnsignedIntegerAttribute};
+use style::{SimpleColorAttribute, SizeIntegerAttribute, ColsIntegerAttribute, UnsignedIntegerAttribute};
 use style::{WidthLengthAttribute, matches};
 use servo_util::namespace;
 use servo_util::str::{DOMString, LengthOrPercentageOrAuto};
@@ -323,6 +324,13 @@ impl RawLayoutElementHelpers for Element {
                 let this: &HTMLInputElement = mem::transmute(self);
                 Some(this.get_size_for_layout() as i32)
             }
+            ColsIntegerAttribute => {
+                if !self.is_htmltextareaelement() {
+                    panic!("I'm not a textarea element!")
+                }
+                let this: &HTMLTextAreaElement = mem::transmute(self);
+                Some(this.get_cols_for_layout() as i32)
+            }
         }
     }
 

components/script/dom/htmltextareaelement.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-use dom::attr::{Attr, AttrValue};
+use dom::attr::{Attr, AttrValue, UIntAttrValue};
 use dom::attr::AttrHelpers;
 use dom::bindings::cell::DOMRefCell;
 use dom::bindings::codegen::Bindings::EventBinding::EventMethods;
@@ -34,6 +34,7 @@ use std::cell::Cell;
 pub struct HTMLTextAreaElement {
     htmlelement: HTMLElement,
     textinput: DOMRefCell<TextInput>,
+    cols: Cell<u32>,
 
     // https://html.spec.whatwg.org/multipage/forms.html#concept-textarea-dirty
     value_changed: Cell<bool>,
@@ -49,6 +50,10 @@ pub trait LayoutHTMLTextAreaElementHelpers {
     unsafe fn get_value_for_layout(self) -> String;
 }
 
+pub trait RawLayoutHTMLTextAreaElementHelpers {
+    unsafe fn get_cols_for_layout(&self) -> u32;
+}
+
 impl LayoutHTMLTextAreaElementHelpers for JS<HTMLTextAreaElement> {
     #[allow(unrooted_must_root)]
     unsafe fn get_value_for_layout(self) -> String {
@@ -56,6 +61,13 @@ impl LayoutHTMLTextAreaElementHelpers for JS<HTMLTextAreaElement> {
     }
 }
 
+impl RawLayoutHTMLTextAreaElementHelpers for HTMLTextAreaElement {
+    #[allow(unrooted_must_root)]
+    unsafe fn get_cols_for_layout(&self) -> u32 {
+        self.cols.get()
+    }
+}
+
 static DEFAULT_COLS: u32 = 20;
 static DEFAULT_ROWS: u32 = 2;
 
@@ -64,6 +76,7 @@ impl HTMLTextAreaElement {
         HTMLTextAreaElement {
             htmlelement: HTMLElement::new_inherited(HTMLTextAreaElementTypeId, localName, prefix, document),
             textinput: DOMRefCell::new(TextInput::new(Multiple, "".to_string())),
+            cols: Cell::new(DEFAULT_COLS),
             value_changed: Cell::new(false),
         }
     }
@@ -186,6 +199,12 @@ impl<'a> VirtualMethods for JSRef<'a, HTMLTextAreaElement> {
                 node.set_disabled_state(true);
                 node.set_enabled_state(false);
             },
+            &atom!("cols") => {
+                match *attr.value() {
+                    UIntAttrValue(_, value) => self.cols.set(value),
+                    _ => panic!("Expected a UIntAttrValue"),
+                }
+            },
             _ => ()
         }
     }
@@ -203,6 +222,9 @@ impl<'a> VirtualMethods for JSRef<'a, HTMLTextAreaElement> {
                 node.set_enabled_state(true);
                 node.check_ancestors_disabled_state_for_form_control();
             },
+            &atom!("cols") => {
+                self.cols.set(DEFAULT_COLS);
+            },
             _ => ()
         }
     }

components/style/legacy.rs

@@ -26,6 +26,7 @@ pub enum LengthAttribute {
 pub enum IntegerAttribute {
     /// `<input size>`
     SizeIntegerAttribute,
+    ColsIntegerAttribute,
 }
 
 /// Legacy presentational attributes that take a nonnegative integer as defined in HTML5 § 2.4.4.2.
@@ -160,6 +161,23 @@ impl PresentationalHintSynthesis for Stylist {
                     Some(_) | None => {}
                 }
             }
+            name if *name == atom!("textarea") => {
+                match element.get_integer_attribute(ColsIntegerAttribute) {
+                    Some(value) if value != 0 => {
+                        // TODO ServoCharacterWidth uses the size math for <input type="text">, but
+                        // the math for <textarea> is a little different since we need to take
+                        // scrollbar size into consideration (but we don't have a scrollbar yet!)
+                        //
+                        // https://html.spec.whatwg.org/multipage/rendering.html#textarea-effective-width
+                        let value = specified::ServoCharacterWidth(value);
+                        matching_rules_list.vec_push(DeclarationBlock::from_declaration(
+                                WidthDeclaration(SpecifiedValue(specified::LPA_Length(
+                                            value)))));
+                        *shareable = false
+                    }
+                    Some(_) | None => {}
+                }
+            }
             _ => {}
         }
     }

components/style/lib.rs

@@ -57,7 +57,7 @@ pub use cssparser::{Color, RGBA};
 pub use legacy::{BgColorSimpleColorAttribute, BorderUnsignedIntegerAttribute};
 pub use legacy::{ColSpanUnsignedIntegerAttribute, IntegerAttribute, LengthAttribute};
 pub use legacy::{SimpleColorAttribute, SizeIntegerAttribute, UnsignedIntegerAttribute};
-pub use legacy::{WidthLengthAttribute};
+pub use legacy::{WidthLengthAttribute, ColsIntegerAttribute};
 pub use font_face::{Source, LocalSource, UrlSource_};
 
 mod stylesheets;