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a11y.ts
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a11y.ts
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import {
ARIARoleDefintionKey,
roles as roles_map,
elementRoles,
ARIARoleRelationConcept
} from 'aria-query';
import { AXObjects, AXObjectRoles, elementAXObjects } from 'axobject-query';
import Attribute from '../nodes/Attribute';
const aria_roles = roles_map.keys();
const abstract_roles = new Set(aria_roles.filter(role => roles_map.get(role).abstract));
const non_abstract_roles = aria_roles.filter((name) => !abstract_roles.has(name) && name !== 'generic');
const non_interactive_roles = new Set(
non_abstract_roles
.filter((name) => {
const role = roles_map.get(name);
return (
// 'toolbar' does not descend from widget, but it does support
// aria-activedescendant, thus in practice we treat it as a widget.
// focusable tabpanel elements are recommended if any panels in a set contain content where the first element in the panel is not focusable.
!['toolbar', 'tabpanel'].includes(name) &&
!role.superClass.some((classes) => classes.includes('widget'))
);
})
.concat(
// The `progressbar` is descended from `widget`, but in practice, its
// value is always `readonly`, so we treat it as a non-interactive role.
'progressbar'
)
);
const interactive_roles = new Set(
non_abstract_roles.filter((name) => !non_interactive_roles.has(name))
);
export enum RoleType {
Interactive = 'interactive',
NonInteractive = 'non-interactive',
Abstract = 'abstract',
Generic = 'generic',
}
export function role_type(role: ARIARoleDefintionKey): RoleType {
if (interactive_roles.has(role)) {
return RoleType.Interactive;
} else if (non_interactive_roles.has(role)) {
return RoleType.NonInteractive;
} else if (abstract_roles.has(role)) {
return RoleType.Abstract;
} else {
return RoleType.Generic;
}
}
const presentation_roles = new Set(['presentation', 'none']);
export function is_presentation_role(role: ARIARoleDefintionKey) {
return presentation_roles.has(role);
}
export function is_hidden_from_screen_reader(tag_name: string, attribute_map: Map<string, Attribute>) {
if (tag_name === 'input') {
const type = attribute_map.get('type')?.get_static_value();
if (type && type === 'hidden') {
return true;
}
}
const aria_hidden = attribute_map.get('aria-hidden');
if (!aria_hidden) return false;
if (!aria_hidden.is_static) return true;
const aria_hidden_value = aria_hidden.get_static_value();
return aria_hidden_value === true || aria_hidden_value === 'true';
}
const non_interactive_element_role_schemas: ARIARoleRelationConcept[] = [];
elementRoles.entries().forEach(([schema, roles]) => {
if ([...roles].every((role) => non_interactive_roles.has(role))) {
non_interactive_element_role_schemas.push(schema);
}
});
const interactive_element_role_schemas: ARIARoleRelationConcept[] = [];
elementRoles.entries().forEach(([schema, roles]) => {
if ([...roles].every((role) => interactive_roles.has(role))) {
interactive_element_role_schemas.push(schema);
}
});
const interactive_ax_objects = new Set(
[...AXObjects.keys()].filter((name) => AXObjects.get(name).type === 'widget')
);
const non_interactive_ax_objects = new Set(
[...AXObjects.keys()].filter((name) => ['windows', 'structure'].includes(AXObjects.get(name).type))
);
const interactive_element_ax_object_schemas: ARIARoleRelationConcept[] = [];
elementAXObjects.entries().forEach(([schema, ax_object]) => {
if ([...ax_object].every((role) => interactive_ax_objects.has(role))) {
interactive_element_ax_object_schemas.push(schema);
}
});
const non_interactive_element_ax_object_schemas: ARIARoleRelationConcept[] = [];
elementAXObjects.entries().forEach(([schema, ax_object]) => {
if ([...ax_object].every((role) => non_interactive_ax_objects.has(role))) {
non_interactive_element_ax_object_schemas.push(schema);
}
});
function match_schema(
schema: ARIARoleRelationConcept,
tag_name: string,
attribute_map: Map<string, Attribute>
) {
if (schema.name !== tag_name) return false;
if (!schema.attributes) return true;
return schema.attributes.every((schema_attribute) => {
const attribute = attribute_map.get(schema_attribute.name);
if (!attribute) return false;
if (
schema_attribute.value &&
schema_attribute.value !== attribute.get_static_value()
) {
return false;
}
return true;
});
}
export enum ElementInteractivity {
Interactive = 'interactive',
NonInteractive = 'non-interactive',
Static = 'static',
}
export function element_interactivity(
tag_name: string,
attribute_map: Map<string, Attribute>
): ElementInteractivity {
if (
interactive_element_role_schemas.some((schema) =>
match_schema(schema, tag_name, attribute_map)
)
) {
return ElementInteractivity.Interactive;
}
if (
tag_name !== 'header' &&
non_interactive_element_role_schemas.some((schema) =>
match_schema(schema, tag_name, attribute_map)
)
) {
return ElementInteractivity.NonInteractive;
}
if (
interactive_element_ax_object_schemas.some((schema) =>
match_schema(schema, tag_name, attribute_map)
)
) {
return ElementInteractivity.Interactive;
}
if (
non_interactive_element_ax_object_schemas.some((schema) =>
match_schema(schema, tag_name, attribute_map)
)
) {
return ElementInteractivity.NonInteractive;
}
return ElementInteractivity.Static;
}
export function is_semantic_role_element(role: ARIARoleDefintionKey, tag_name: string, attribute_map: Map<string, Attribute>) {
for (const [schema, ax_object] of elementAXObjects.entries()) {
if (schema.name === tag_name && (!schema.attributes || schema.attributes.every(
(attr) => attribute_map.has(attr.name) && attribute_map.get(attr.name).get_static_value() === attr.value
))) {
for (const name of ax_object) {
const roles = AXObjectRoles.get(name);
if (roles) {
for (const { name } of roles) {
if (name === role) {
return true;
}
}
}
}
}
}
return false;
}