Tokenize and format timestamps in Markdown

1. Find and tokenize timestamps, i.e. "XX:XX:XX" strings.
2. Transform 'timestamp' nodes to Links.
This commit is contained in:
infiinte-persistence 2020-12-09 21:20:07 +08:00 committed by Sean Yesmunt
parent 04fbde49ec
commit 93709fbeb8
2 changed files with 84 additions and 0 deletions

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@ -10,6 +10,7 @@ import reactRenderer from 'remark-react';
import MarkdownLink from 'component/markdownLink';
import defaultSchema from 'hast-util-sanitize/lib/github.json';
import { formatedLinks, inlineLinks } from 'util/remark-lbry';
import { formattedTimestamp, inlineTimestamp } from 'util/remark-timestamp';
type SimpleTextProps = {
children?: React.Node,
@ -149,6 +150,8 @@ const MarkdownPreview = (props: MarkdownProps) => {
// Note: The order is important
.use(formatedLinks)
.use(inlineLinks)
.use(isMarkdownPost ? null : inlineTimestamp)
.use(isMarkdownPost ? null : formattedTimestamp)
// Emojis
.use(remarkEmoji)
// Render new lines without needing spaces.

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@ -0,0 +1,81 @@
import visit from 'unist-util-visit';
const TIMESTAMP_NODE_TYPE = 'timestamp';
const TIMESTAMP_REGEX = /(?<!\d|:)([01]?\d|2[0-3]):([0-5]\d)(?::([0-5]\d))?(?!\d|:)/g;
// ***************************************************************************
// Tokenize timestamp
// ***************************************************************************
function locateTimestamp(value, fromIndex) {
const timestamps = Array.from(value.matchAll(TIMESTAMP_REGEX));
return timestamps.length === 0 ? -1 : timestamps[0].index;
}
// Generate 'timestamp' markdown node
const createTimestampNode = text => ({
type: TIMESTAMP_NODE_TYPE,
value: text,
children: [{ type: 'text', value: text }],
});
// Generate a markdown link from timestamp
function tokenizeTimestamp(eat, value, silent) {
if (silent) {
return true;
}
const match = value.match(TIMESTAMP_REGEX);
if (match) {
try {
const text = match[0];
return eat(text)(createTimestampNode(text));
} catch (err) {
// Do nothing
}
}
}
tokenizeTimestamp.locator = locateTimestamp;
tokenizeTimestamp.notInList = true;
tokenizeTimestamp.notInLink = true;
tokenizeTimestamp.notInBlock = true;
export function inlineTimestamp() {
const Parser = this.Parser;
const tokenizers = Parser.prototype.inlineTokenizers;
const methods = Parser.prototype.inlineMethods;
// Add an inline tokenizer (defined in the following example).
tokenizers.timestamp = tokenizeTimestamp;
// Run it just before `text`.
methods.splice(methods.indexOf('text'), 0, 'timestamp');
}
// ***************************************************************************
// Format timestamp
// ***************************************************************************
function strToSeconds(stime) {
const tt = stime.split(':').reverse();
return (tt.length >= 3 ? +tt[2] : 0) * 60 * 60 + (tt.length >= 2 ? +tt[1] : 0) * 60 + (tt.length >= 1 ? +tt[0] : 0);
}
const transformer = (node, index, parent) => {
if (node.type === TIMESTAMP_NODE_TYPE && parent && parent.type === 'paragraph') {
const timestampStr = node.value;
const seconds = strToSeconds(timestampStr);
node.type = 'link';
node.url = `?t=${seconds}`;
node.title = timestampStr;
node.children = [{ type: 'text', value: timestampStr }];
}
};
const transform = tree => {
visit(tree, [TIMESTAMP_NODE_TYPE], transformer);
};
export const formattedTimestamp = () => transform;