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"use strict";
exports.__esModule = true;
exports.default = getRole;
exports.getLocalName = getLocalName;
// https://w3c.github.io/html-aria/#document-conformance-requirements-for-use-of-aria-attributes-in-html
/**
* Safe Element.localName for all supported environments
* @param element
*/
function getLocalName(element) {
var _element$localName;
return (// eslint-disable-next-line no-restricted-properties -- actual guard for environments without localName
(_element$localName = element.localName) !== null && _element$localName !== void 0 ? _element$localName : // eslint-disable-next-line no-restricted-properties -- required for the fallback
element.tagName.toLowerCase()
);
}
var localNameToRoleMappings = {
article: "article",
aside: "complementary",
button: "button",
datalist: "listbox",
dd: "definition",
details: "group",
dialog: "dialog",
dt: "term",
fieldset: "group",
figure: "figure",
// WARNING: Only with an accessible name
form: "form",
footer: "contentinfo",
h1: "heading",
h2: "heading",
h3: "heading",
h4: "heading",
h5: "heading",
h6: "heading",
header: "banner",
hr: "separator",
html: "document",
legend: "legend",
li: "listitem",
math: "math",
main: "main",
menu: "list",
nav: "navigation",
ol: "list",
optgroup: "group",
// WARNING: Only in certain context
option: "option",
output: "status",
progress: "progressbar",
// WARNING: Only with an accessible name
section: "region",
summary: "button",
table: "table",
tbody: "rowgroup",
textarea: "textbox",
tfoot: "rowgroup",
// WARNING: Only in certain context
td: "cell",
th: "columnheader",
thead: "rowgroup",
tr: "row",
ul: "list"
};
var prohibitedAttributes = {
caption: new Set(["aria-label", "aria-labelledby"]),
code: new Set(["aria-label", "aria-labelledby"]),
deletion: new Set(["aria-label", "aria-labelledby"]),
emphasis: new Set(["aria-label", "aria-labelledby"]),
generic: new Set(["aria-label", "aria-labelledby", "aria-roledescription"]),
insertion: new Set(["aria-label", "aria-labelledby"]),
paragraph: new Set(["aria-label", "aria-labelledby"]),
presentation: new Set(["aria-label", "aria-labelledby"]),
strong: new Set(["aria-label", "aria-labelledby"]),
subscript: new Set(["aria-label", "aria-labelledby"]),
superscript: new Set(["aria-label", "aria-labelledby"])
};
/**
*
* @param element
* @param role The role used for this element. This is specified to control whether you want to use the implicit or explicit role.
*/
function hasGlobalAriaAttributes(element, role) {
// https://rawgit.com/w3c/aria/stable/#global_states
// commented attributes are deprecated
return ["aria-atomic", "aria-busy", "aria-controls", "aria-current", "aria-describedby", "aria-details", // "disabled",
"aria-dropeffect", // "errormessage",
"aria-flowto", "aria-grabbed", // "haspopup",
"aria-hidden", // "invalid",
"aria-keyshortcuts", "aria-label", "aria-labelledby", "aria-live", "aria-owns", "aria-relevant", "aria-roledescription"].some(function (attributeName) {
var _prohibitedAttributes;
return element.hasAttribute(attributeName) && !((_prohibitedAttributes = prohibitedAttributes[role]) !== null && _prohibitedAttributes !== void 0 && _prohibitedAttributes.has(attributeName));
});
}
function ignorePresentationalRole(element, implicitRole) {
// https://rawgit.com/w3c/aria/stable/#conflict_resolution_presentation_none
return hasGlobalAriaAttributes(element, implicitRole);
}
function getRole(element) {
var explicitRole = getExplicitRole(element);
if (explicitRole === null || explicitRole === "presentation") {
var implicitRole = getImplicitRole(element);
if (explicitRole !== "presentation" || ignorePresentationalRole(element, implicitRole || "")) {
return implicitRole;
}
}
return explicitRole;
}
function getImplicitRole(element) {
var mappedByTag = localNameToRoleMappings[getLocalName(element)];
if (mappedByTag !== undefined) {
return mappedByTag;
}
switch (getLocalName(element)) {
case "a":
case "area":
case "link":
if (element.hasAttribute("href")) {
return "link";
}
break;
case "img":
if (element.getAttribute("alt") === "" && !ignorePresentationalRole(element, "img")) {
return "presentation";
}
return "img";
case "input":
{
var _ref = element,
type = _ref.type;
switch (type) {
case "button":
case "image":
case "reset":
case "submit":
return "button";
case "checkbox":
case "radio":
return type;
case "range":
return "slider";
case "email":
case "tel":
case "text":
case "url":
if (element.hasAttribute("list")) {
return "combobox";
}
return "textbox";
case "search":
if (element.hasAttribute("list")) {
return "combobox";
}
return "searchbox";
case "number":
return "spinbutton";
default:
return null;
}
}
case "select":
if (element.hasAttribute("multiple") || element.size > 1) {
return "listbox";
}
return "combobox";
}
return null;
}
function getExplicitRole(element) {
var role = element.getAttribute("role");
if (role !== null) {
var explicitRole = role.trim().split(" ")[0]; // String.prototype.split(sep, limit) will always return an array with at least one member
// as long as limit is either undefined or > 0
if (explicitRole.length > 0) {
return explicitRole;
}
}
return null;
}
//# sourceMappingURL=getRole.js.map