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b7f670f5a0
This is definitely better than having linkifiers reach directly into marked.js, but there is probably further improvement we can do here to clean up how these regexes get set. This introduces a circular dependency between markdown.js and linkifiers.js, but we will soon break it in the other direction.
88 lines
2.9 KiB
JavaScript
88 lines
2.9 KiB
JavaScript
import * as blueslip from "./blueslip";
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import * as markdown from "./markdown";
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const linkifier_map = new Map(); // regex -> url
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export function get_linkifier_map() {
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return linkifier_map;
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}
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function python_to_js_linkifier(pattern, url) {
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// Converts a python named-group regex to a javascript-compatible numbered
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// group regex... with a regex!
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const named_group_re = /\(?P<([^>]+?)>/g;
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let match = named_group_re.exec(pattern);
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let current_group = 1;
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while (match) {
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const name = match[1];
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// Replace named group with regular matching group
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pattern = pattern.replace("(?P<" + name + ">", "(");
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// Replace named reference in URL to numbered reference
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url = url.replace("%(" + name + ")s", "\\" + current_group);
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// Reset the RegExp state
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named_group_re.lastIndex = 0;
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match = named_group_re.exec(pattern);
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current_group += 1;
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}
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// Convert any python in-regex flags to RegExp flags
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let js_flags = "g";
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const inline_flag_re = /\(\?([Limsux]+)\)/;
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match = inline_flag_re.exec(pattern);
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// JS regexes only support i (case insensitivity) and m (multiline)
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// flags, so keep those and ignore the rest
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if (match) {
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const py_flags = match[1].split("");
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for (const flag of py_flags) {
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if ("im".includes(flag)) {
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js_flags += flag;
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}
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}
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pattern = pattern.replace(inline_flag_re, "");
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}
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// Ideally we should have been checking that linkifiers
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// begin with certain characters but since there is no
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// support for negative lookbehind in javascript, we check
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// for this condition in `contains_backend_only_syntax()`
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// function. If the condition is satisfied then the message
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// is rendered locally, otherwise, we return false there and
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// message is rendered on the backend which has proper support
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// for negative lookbehind.
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pattern = pattern + /(?!\w)/.source;
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let final_regex = null;
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try {
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final_regex = new RegExp(pattern, js_flags);
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} catch (error) {
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// We have an error computing the generated regex syntax.
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// We'll ignore this linkifier for now, but log this
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// failure for debugging later.
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blueslip.error("python_to_js_linkifier: " + error.message);
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}
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return [final_regex, url];
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}
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export function update_linkifier_rules(linkifiers) {
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linkifier_map.clear();
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for (const linkifier of linkifiers) {
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const [regex, final_url] = python_to_js_linkifier(linkifier.pattern, linkifier.url_format);
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if (!regex) {
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// Skip any linkifiers that could not be converted
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continue;
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}
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linkifier_map.set(regex, final_url);
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}
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// Update our parser with our particular set of linkifiers.
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markdown.set_linkifier_regexes(Array.from(linkifier_map.keys()));
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}
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export function initialize(linkifiers) {
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update_linkifier_rules(linkifiers);
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}
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