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links.ts
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links.ts
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import {htmlify} from '../util';
/**
* Renders a single link to HTML.
*/
export function renderLink(target: string, label?: string) {
// Does the target look like an external link?
if (/^\w+:\/\/\/?\w/i.test(target)) {
return htmlify('a', {class: 'link', href: target}, [label ?? target]);
}
// We'll treat it as a passage link if not.
return htmlify('passage-link', {class: 'link', to: target}, [
label ?? target
]);
}
/**
* Renders all Twine link formats into HTML links.
*/
export function renderLinks(source: string) {
return source.replace(
/\[\[(.*?)\]\]/g,
(originalSource: string, target: string) => {
let label = target;
// display|target format
const barIndex = target.indexOf('|');
if (barIndex !== -1) {
label = target.substring(0, barIndex);
target = target.substring(barIndex + 1);
} else {
// display->target format
const rightArrIndex = target.indexOf('->');
if (rightArrIndex !== -1) {
label = target.substring(0, rightArrIndex);
target = target.substring(rightArrIndex + 2);
} else {
// target<-display format
const leftArrIndex = target.indexOf('<-');
if (leftArrIndex !== -1) {
label = target.substring(leftArrIndex + 2);
target = target.substring(0, leftArrIndex);
}
}
}
// If the target or label is an empty string, don't process it.
if (label === '' || target === '') {
return originalSource;
}
return renderLink(target, label ?? target);
}
);
}