62 lines
1.8 KiB
JavaScript
62 lines
1.8 KiB
JavaScript
import { AuditoryDescription } from '../audio/auditory_description.js';
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import * as XpathUtil from '../common/xpath_util.js';
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import { LOCALE } from '../l10n/locale.js';
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import { SemanticType } from '../semantic_tree/semantic_meaning.js';
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export function unitMultipliers(nodes, _context) {
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const children = nodes;
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let counter = 0;
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return function () {
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const descr = AuditoryDescription.create({
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text: rightMostUnit(children[counter]) &&
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leftMostUnit(children[counter + 1])
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? LOCALE.MESSAGES.unitTimes
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: ''
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}, {});
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counter++;
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return [descr];
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};
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}
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const SCRIPT_ELEMENTS = [
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SemanticType.SUPERSCRIPT,
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SemanticType.SUBSCRIPT,
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SemanticType.OVERSCORE,
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SemanticType.UNDERSCORE
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];
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function rightMostUnit(node) {
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while (node) {
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if (node.getAttribute('role') === 'unit') {
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return true;
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}
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const tag = node.tagName;
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const children = XpathUtil.evalXPath('children/*', node);
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node = (SCRIPT_ELEMENTS.indexOf(tag) !== -1
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? children[0]
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: children[children.length - 1]);
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}
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return false;
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}
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function leftMostUnit(node) {
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while (node) {
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if (node.getAttribute('role') === 'unit') {
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return true;
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}
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const children = XpathUtil.evalXPath('children/*', node);
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node = children[0];
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}
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return false;
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}
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export function oneLeft(node) {
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while (node) {
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if (node.tagName === 'number' && node.textContent === '1') {
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return [node];
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}
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if (node.tagName !== 'infixop' ||
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(node.getAttribute('role') !== 'multiplication' &&
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node.getAttribute('role') !== 'implicit')) {
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return [];
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}
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node = XpathUtil.evalXPath('children/*', node)[0];
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}
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return [];
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}
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