Revert "Use instanceof to safely downcast (#182)"

src/Webapi/Canvas/Webapi__Canvas__Canvas2d.re

@@ -112,22 +112,25 @@ let setFillStyle = (type a, ctx: t, _: style(a), v: a) =>
  setFillStyle(ctx, v);
 
 let reifyStyle = (type a, x: 'a) : (style(a), a) => {
- let isCanvasGradient: 'a => bool = [%raw {|
- function(x) { return x instanceof CanvasGradient; }
- |}];
-
- let isCanvasPattern: 'a => bool = [%raw {|
- function(x) { return x instanceof CanvasPattern; }
- |}];
+ module Internal = {
+ type constructor;
+ [@bs.val] external canvasGradient : constructor = "CanvasGradient"; /* internal */
+ [@bs.val] external canvasPattern : constructor = "CanvasPattern"; /* internal */
+ let instanceOf: ('a, constructor) => bool = [%bs.raw {|function(x,y) {return +(x instanceof y)}|}]; /* internal */
+ };
 
  (
- if (Js.typeof(x) == "string") Obj.magic(String)
- else if (isCanvasGradient(x)) Obj.magic(Gradient)
- else if (isCanvasPattern(x)) Obj.magic(Pattern)
- else invalid_arg(
- "Unknown canvas style kind. Known values are: String, CanvasGradient, CanvasPattern"),
+ if (Js.typeof(x) == "string") {
+ Obj.magic(String)
+ } else if (Internal.instanceOf(x, Internal.canvasGradient)) {
+ Obj.magic(Gradient)
+ } else if (Internal.instanceOf(x, Internal.canvasPattern)) {
+ Obj.magic(Pattern)
+ } else {
+ raise(Invalid_argument("Unknown canvas style kind. Known values are: String, CanvasGradient, CanvasPattern"))
+ },
  Obj.magic(x)
- );
+ )
 };
 
 [@bs.get] external fillStyle : t => 'a = "fillStyle";

src/Webapi/Dom/Webapi__Dom__Document.re

@@ -1,21 +1,17 @@
 module Impl = (T: {type t;}) => {
  external asDocument : T.t => Dom.document = "%identity";
 
- let asHtmlDocument: T.t => option(Dom.htmlDocument) = [%raw {|
- function(document) {
- var defaultView = document.defaultView;
-
- if (defaultView != null) {
- var HTMLDocument = defaultView.HTMLDocument;
-
- if (HTMLDocument != null && document instanceof HTMLDocument) {
- return document;
- }
- }
+ let asHtmlDocument: T.t => Js.null(Dom.htmlDocument) = [%raw
+ {|
+ function (document) {
+ return document.doctype.name === "html" ? document : null;
  }
- |}];
+ |}
+ ];
+ [@deprecated "Will fail if no doctype is defined, consider using unsafeAsHtmlDocument instead"]
+ let asHtmlDocument: T.t => option(Dom.htmlDocument) =
+ (self) => Js.Null.toOption(asHtmlDocument(self));
 
- /** Unsafe cast, use [ashtmlDocument] instead */
  external unsafeAsHtmlDocument : T.t => Dom.htmlDocument = "%identity";
 
  let ofNode = (node: Dom.node) : option(T.t) =>

src/Webapi/Dom/Webapi__Dom__Element.re

@@ -5,25 +5,18 @@ let ofNode = (node: Dom.node) : option('a) =>
  None;
 
 module Impl = (T: {type t;}) => {
- let asHtmlElement: T.t => option(Dom.htmlElement) = [%raw {|
- function(element) {
- var ownerDocument = element.ownerDocument;
-
- if (ownerDocument != null) {
- var defaultView = ownerDocument.defaultView;
-
- if (defaultView != null) {
- var HTMLElement = defaultView.HTMLElement;
-
- if (HTMLElement != null && element instanceof HTMLElement) {
- return element;
- }
- }
- }
+ let asHtmlElement: T.t => Js.null(Dom.htmlElement) = [%raw
+ {|
+ function (element) {
+ // BEWARE: Assumes "contentEditable" uniquely identifies an HTMLELement
+ return element.contentEditable !== undefined ? element : null;
  }
- |}];
+ |}
+ ];
+ [@deprecated "asHtmlElement uses a weak heuristic, consider using unsafeAsHtmlElement instead"]
+ let asHtmlElement: T.t => option(Dom.htmlElement) =
+ (self) => Js.Null.toOption(asHtmlElement(self));
 
- /** Unsafe cast, use [asHtmlElement] instead */
  external unsafeAsHtmlElement : T.t => Dom.htmlElement = "%identity";
 
  let ofNode: Dom.node => option(T.t) = ofNode;

src/Webapi/Dom/Webapi__Dom__HtmlElement.re

@@ -1,7 +1,16 @@
 module Impl = (T: {type t;}) => {
  type t_htmlElement = T.t;
 
- let ofElement = Webapi__Dom__Element.asHtmlElement;
+ let ofElement: Dom.element => Js.null(t_htmlElement) = [%bs.raw
+ {|
+ function (element) {
+ // BEWARE: Assumes "contentEditable" uniquely identifies an HTMLELement
+ return element.contentEditable !== undefined ? element : null;
+ }
+ |}
+ ];
+ [@deprecated "Consider using Element.asHtmlElement or Element.unsafeAsHtmlElement instead"]
+ let ofElement: Dom.element => option(t_htmlElement) = (self) => Js.Null.toOption(ofElement(self));
 
  [@bs.get] external accessKey : t_htmlElement => string = "accessKey";
  [@bs.set] external setAccessKey : (t_htmlElement, string) => unit = "accessKey";

tests/Webapi/Dom/Webapi__Dom__DomStringMap__test.re

@@ -4,13 +4,9 @@ open Webapi.Dom.DomStringMap;
 let dataset =
  document
  |> Document.createElement("div")
- |> Element.asHtmlElement
- |> Belt.Option.map(_, HtmlElement.dataset);
+ |> Element.unsafeAsHtmlElement
+ |> HtmlElement.dataset;
 
-let () = switch (dataset) {
- | Some(dataset) =>
- set("fooKey", "barValue", dataset);
- dataset |> get("fooKey") |> ignore;
- unsafeDeleteKey("fooKey", dataset);
- | None => ()
-};
+let () = set("fooKey", "barValue", dataset);
+let _ = get("fooKey", dataset);
+let () = unsafeDeleteKey("fooKey", dataset);