DevTools: Add autocomplete for ARIA

third_party/WebKit/Source/devtools/front_end/accessibility/ARIAMetadata.js

Index: third_party/WebKit/Source/devtools/front_end/accessibility/ARIAMetadata.js
diff --git a/third_party/WebKit/Source/devtools/front_end/accessibility/ARIAMetadata.js b/third_party/WebKit/Source/devtools/front_end/accessibility/ARIAMetadata.js
new file mode 100644
index 0000000000000000000000000000000000000000..ca165f3253650dc16299385a5a0e76c4261099be
--- /dev/null
+++ b/third_party/WebKit/Source/devtools/front_end/accessibility/ARIAMetadata.js
@@ -0,0 +1,150 @@
+// Copyright (c) 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @constructor
+ * @param {?Object} config
+ */
+WebInspector.ARIAMetadata = function(config)
+{
+    /**
+     * @type {!Map<string, !WebInspector.ARIAMetadata.Attribute>}

[lushnikov, 2016/08/25 18:46:45]

nit: we usually do one-line typedefs

/** @type {!Map<string, !WebInspector.ARIAMetadata.Attribute>} */

[aboxhall, 2016/08/26 18:15:06]

Oops, done, thanks.

+     */
+    this._attributes = new Map();
+
+    if (config)
+        this._initialize(config);
+}
+
+/**
+ * @param {!Object} config
+ */
+WebInspector.ARIAMetadata.initializeWithConfig = function(config)
+{
+    WebInspector.ARIAMetadata.instance = new WebInspector.ARIAMetadata(config);

[lushnikov, 2016/08/25 18:46:45]

let's design it like WI.CSSMetadata object? This will make our code consistent

WebInspector.ariaMetadata = function()
{
    if (!WebInspector.ARIAMetadata._instance)
        WebInspector.ARIAMetadata._instance = new
WebInspector.ARIAMetadata(WebInspector.ARIAMetadata._generatedConfig || null);
    return WebInspector.ARIAMetadata._instance;
}

[aboxhall, 2016/08/26 18:15:06]

Done.

+};
+
+WebInspector.ARIAMetadata.prototype = {
+    /**
+     * @param {!Object} config
+     */
+    _initialize: function(config)
+    {
+        var attributes = config["attributes"];
+        WebInspector.ARIAMetadata.Attributes = new WebInspector.ARIAMetadata.ValueSet(Object.keys(attributes));
+
+        var booleanEnum = ["true", "false"];
+        for (var name in attributes) {
+            var attributeConfig = attributes[name];
+            if (attributeConfig.type === "boolean")
+                attributeConfig.enum = booleanEnum;
+            this._attributes.set(name, new WebInspector.ARIAMetadata.Attribute(name, attributeConfig));
+        }
+
+        if (!("roles" in config))
+            return;
+
+        var roles = config["roles"];
+        WebInspector.ARIAMetadata.Roles = new WebInspector.ARIAMetadata.ValueSet(Object.keys(roles));

[lushnikov, 2016/08/25 18:46:46]

why store this as a global object? Can we just make this._roles =
Object.keys(roles);

[aboxhall, 2016/08/26 18:15:06]

A future change will add back this._roles as the set of richer roles metadata
(based on the data in ARIAConfig), whereas this is just the set of role names.

+    },
+
+    /**
+     * @param {string} property
+     * @return {!WebInspector.ARIAMetadata.ValueSet}
+     */
+    valueSetForProperty: function(property)
+    {
+        if (this._attributes.has(property))
+            return new WebInspector.ARIAMetadata.ValueSet(this._attributes.get(property).enum());
+
+        if (property === "role")
+            return WebInspector.ARIAMetadata.Roles;
+
+        return new WebInspector.ARIAMetadata.ValueSet([]);
+    }
+};
+
+/**
+ * @constructor
+ * @param {?Array<string>} values

[lushnikov, 2016/08/25 18:46:46]

do we ever create it with a null?

[aboxhall, 2016/08/26 18:15:06]

n/a

+ */
+WebInspector.ARIAMetadata.ValueSet = function(values)

[lushnikov, 2016/08/25 18:46:46]

Let's get rid of this class altogether - it doesn't do much.
We would be able to filter things ad-hoc in ARIAAttributesView.js:240

[aboxhall, 2016/08/26 18:15:06]

Done.

+{
+    this._values = values;
+};
+
+WebInspector.ARIAMetadata.ValueSet.prototype = {
+    /**
+     * @param {string} prefix
+     * @return {!Array<string>}
+     */
+    startsWith: function(prefix)
+    {
+        return this._values.filter((value) => value.startsWith(prefix));
+    }
+};
+
+/**
+ * @constructor
+ * @param {string} name
+ * @param {!Object} config
+ */
+WebInspector.ARIAMetadata.Attribute = function(name, config)
+{
+    /** @type {string} */
+    this._name = name;

[lushnikov, 2016/08/25 18:46:46]

is this ever used?

[aboxhall, 2016/08/26 18:15:06]

No.

+
+    /** @type {string} */
+    this._type = config.type;
+
+    /** @type {?string} */
+    this._default = null;
+
+    /** @type {?Array<string>} */
+    this._enum = null;

[lushnikov, 2016/08/25 18:46:46]

it looks like you never actually expect these to be null - can we enforce this
through constructor non-nullable types?

[aboxhall, 2016/08/26 18:15:06]

Done.

+
+    if ("default" in config)
+        this._default = config["default"];
+
+    if ("enum" in config)
+        this._enum = config.enum;
+};
+
+WebInspector.ARIAMetadata.Attribute.prototype = {
+    /**
+     * @return {string}
+     */
+    type: function()

[lushnikov, 2016/08/25 18:46:46]

this seems to be unused as well

[aboxhall, 2016/08/26 18:15:06]

Done.

+    {
+        return this._type;
+    },
+
+    /**
+     * @return {?string}
+     */
+    defaultValue: function()

[lushnikov, 2016/08/25 18:46:46]

where do you use this? 

[aboxhall, 2016/08/26 18:15:06]

Not yet used.

+    {
+        return this._default;
+    },
+
+    /**
+     * @return {?Array<string>}
+     */
+    enum: function()

[lushnikov, 2016/08/25 18:46:46]

are these values? we have a defaultValue, so this would be natural to call
values: as well

[aboxhall, 2016/08/26 18:15:06]

I'd rather keep it as enum, as it's only relevant for certain types of
attributes. (i.e. the value of the attribute may be one of the values of `enum`,
iff the type of the attribute is token or boolean)

+    {
+        return this._enum

[lushnikov, 2016/08/25 18:46:45]

nit: missing ;

[aboxhall, 2016/08/26 18:15:06]

Done.

+    }
+};
+
+/** @enum {string} */
+WebInspector.ARIAMetadata.AttributeTypes = {

[lushnikov, 2016/08/25 18:46:45]

are these ever used? I didn't find any occurrence.

[aboxhall, 2016/08/26 18:15:06]

Not yet.

+    BOOLEAN: "boolean",
+    IDREF: "IDREF",
+    IDREF_LIST: "IDREF_list",
+    INTEGER: "integer",
+    NUMBER: "decimal",
+    STRING: "string",
+    TOKEN: "token",
+    TOKEN_LIST: "token_list",
+};