react-pdf
Version:
Display PDFs in your React app as easily as if they were images.
70 lines (69 loc) • 2.24 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.isPdfRole = isPdfRole;
exports.isStructTreeNode = isStructTreeNode;
exports.isStructTreeNodeWithOnlyContentChild = isStructTreeNodeWithOnlyContentChild;
exports.getRoleAttributes = getRoleAttributes;
exports.getBaseAttributes = getBaseAttributes;
exports.getAttributes = getAttributes;
const constants_js_1 = require("./constants.js");
function isPdfRole(role) {
return role in constants_js_1.PDF_ROLE_TO_HTML_ROLE;
}
function isStructTreeNode(node) {
return 'children' in node;
}
function isStructTreeNodeWithOnlyContentChild(node) {
if (!isStructTreeNode(node)) {
return false;
}
return node.children.length === 1 && 0 in node.children && 'id' in node.children[0];
}
function getRoleAttributes(node) {
const attributes = {};
if (isStructTreeNode(node)) {
const { role } = node;
const matches = role.match(constants_js_1.HEADING_PATTERN);
if (matches) {
attributes.role = 'heading';
attributes['aria-level'] = Number(matches[1]);
}
else if (isPdfRole(role)) {
const htmlRole = constants_js_1.PDF_ROLE_TO_HTML_ROLE[role];
if (htmlRole) {
attributes.role = htmlRole;
}
}
}
return attributes;
}
function getBaseAttributes(node) {
const attributes = {};
if (isStructTreeNode(node)) {
if (node.alt !== undefined) {
attributes['aria-label'] = node.alt;
}
if (node.lang !== undefined) {
attributes.lang = node.lang;
}
if (isStructTreeNodeWithOnlyContentChild(node)) {
const [child] = node.children;
if (child) {
const childAttributes = getBaseAttributes(child);
return Object.assign(Object.assign({}, attributes), childAttributes);
}
}
}
else {
if ('id' in node) {
attributes['aria-owns'] = node.id;
}
}
return attributes;
}
function getAttributes(node) {
if (!node) {
return null;
}
return Object.assign(Object.assign({}, getRoleAttributes(node)), getBaseAttributes(node));
}