93709fbeb8
1. Find and tokenize timestamps, i.e. "XX:XX:XX" strings. 2. Transform 'timestamp' nodes to Links.
82 lines
2.4 KiB
JavaScript
82 lines
2.4 KiB
JavaScript
import visit from 'unist-util-visit';
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const TIMESTAMP_NODE_TYPE = 'timestamp';
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const TIMESTAMP_REGEX = /(?<!\d|:)([01]?\d|2[0-3]):([0-5]\d)(?::([0-5]\d))?(?!\d|:)/g;
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// ***************************************************************************
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// Tokenize timestamp
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// ***************************************************************************
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function locateTimestamp(value, fromIndex) {
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const timestamps = Array.from(value.matchAll(TIMESTAMP_REGEX));
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return timestamps.length === 0 ? -1 : timestamps[0].index;
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}
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// Generate 'timestamp' markdown node
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const createTimestampNode = text => ({
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type: TIMESTAMP_NODE_TYPE,
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value: text,
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children: [{ type: 'text', value: text }],
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});
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// Generate a markdown link from timestamp
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function tokenizeTimestamp(eat, value, silent) {
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if (silent) {
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return true;
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}
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const match = value.match(TIMESTAMP_REGEX);
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if (match) {
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try {
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const text = match[0];
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return eat(text)(createTimestampNode(text));
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} catch (err) {
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// Do nothing
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}
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}
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}
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tokenizeTimestamp.locator = locateTimestamp;
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tokenizeTimestamp.notInList = true;
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tokenizeTimestamp.notInLink = true;
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tokenizeTimestamp.notInBlock = true;
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export function inlineTimestamp() {
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const Parser = this.Parser;
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const tokenizers = Parser.prototype.inlineTokenizers;
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const methods = Parser.prototype.inlineMethods;
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// Add an inline tokenizer (defined in the following example).
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tokenizers.timestamp = tokenizeTimestamp;
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// Run it just before `text`.
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methods.splice(methods.indexOf('text'), 0, 'timestamp');
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}
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// ***************************************************************************
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// Format timestamp
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// ***************************************************************************
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function strToSeconds(stime) {
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const tt = stime.split(':').reverse();
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return (tt.length >= 3 ? +tt[2] : 0) * 60 * 60 + (tt.length >= 2 ? +tt[1] : 0) * 60 + (tt.length >= 1 ? +tt[0] : 0);
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}
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const transformer = (node, index, parent) => {
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if (node.type === TIMESTAMP_NODE_TYPE && parent && parent.type === 'paragraph') {
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const timestampStr = node.value;
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const seconds = strToSeconds(timestampStr);
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node.type = 'link';
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node.url = `?t=${seconds}`;
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node.title = timestampStr;
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node.children = [{ type: 'text', value: timestampStr }];
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}
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};
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const transform = tree => {
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visit(tree, [TIMESTAMP_NODE_TYPE], transformer);
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};
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export const formattedTimestamp = () => transform;
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