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Factor out common URL regular expression code

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This also eliminates the differences between the regular expressions.
This commit is contained in:
Richard Hansen 2020-12-11 15:55:13 -05:00 • committed by John McLear
parent 66d0eb9a1f
commit 7e8de5540f
4 changed files with 74 additions and 73 deletions
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104
src/static/js/pad_utils.js
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@ -39,6 +39,55 @@ const randomString = (len) => {
return randomstring;
};
// Set of "letter or digit" chars is based on section 20.5.16 of the original Java Language Spec.
const wordCharRegex = new RegExp(`[${[
'\u0030-\u0039',
'\u0041-\u005A',
'\u0061-\u007A',
'\u00C0-\u00D6',
'\u00D8-\u00F6',
'\u00F8-\u00FF',
'\u0100-\u1FFF',
'\u3040-\u9FFF',
'\uF900-\uFDFF',
'\uFE70-\uFEFE',
'\uFF10-\uFF19',
'\uFF21-\uFF3A',
'\uFF41-\uFF5A',
'\uFF66-\uFFDC',
].join('')}]`);
const urlRegex = (() => {
// TODO: wordCharRegex matches many characters that are not permitted in URIs. Are they included
// here as an attempt to support IRIs? (See https://tools.ietf.org/html/rfc3987.)
const urlChar = `[-:@_.,~%+/?=&#!;()$${wordCharRegex.source.slice(1, -1)}]`;
// Matches a single character that should not be considered part of the URL if it is the last
// character that matches urlChar.
const postUrlPunct = '[:.,;]';
// Schemes that must be followed by ://
const withAuth = `(?:${[
'(?:x-)?man',
'afp',
'file',
'ftps?',
'gopher',
'https?',
'nfs',
'sftp',
'smb',
'txmt',
].join('|')})://`;
// Schemes that do not need to be followed by ://
const withoutAuth = `(?:${[
'about',
'geo',
'mailto',
'tel',
].join('|')}):`;
return new RegExp(
`(?:${withAuth}|${withoutAuth}|www\\.)${urlChar}*(?!${postUrlPunct})${urlChar}`, 'g');
})();
const padutils = {
escapeHtml: (x) => Security.escapeHTML(String(x)),
uniqueId: () => {
@ -75,45 +124,24 @@ const padutils = {
const hourmin = `${d.getHours()}:${(`0${d.getMinutes()}`).slice(-2)}`;
return `${dayOfWeek} ${month} ${dayOfMonth} ${year} ${hourmin}`;
},
wordCharRegex,
urlRegex,
// returns null if no URLs, or [[startIndex1, url1], [startIndex2, url2], ...]
findURLs: (text) => {
// copied from ACE
const _REGEX_WORDCHAR = new RegExp(`[${[
'\u0030-\u0039',
'\u0041-\u005A',
'\u0061-\u007A',
'\u00C0-\u00D6',
'\u00D8-\u00F6',
'\u00F8-\u00FF',
'\u0100-\u1FFF',
'\u3040-\u9FFF',
'\uF900-\uFDFF',
'\uFE70-\uFEFE',
'\uFF10-\uFF19',
'\uFF21-\uFF3A',
'\uFF41-\uFF5A',
'\uFF66-\uFFDC',
].join('')}]`);
const _REGEX_URLCHAR = new RegExp(`([-:@a-zA-Z0-9_.,~%+/?=&#;()$]|${_REGEX_WORDCHAR.source})`);
const _REGEX_URL = new RegExp(
'(?:(?:https?|s?ftp|ftps|file|nfs)://|(about|geo|mailto|tel):)' +
`${_REGEX_URLCHAR.source}*(?![:.,;])${_REGEX_URLCHAR.source}`, 'g');
// returns null if no URLs, or [[startIndex1, url1], [startIndex2, url2], ...]
const _findURLs = (text) => {
_REGEX_URL.lastIndex = 0;
let urls = null;
let execResult;
while ((execResult = _REGEX_URL.exec(text))) {
urls = (urls || []);
const startIndex = execResult.index;
const url = execResult[0];
urls.push([startIndex, url]);
}
return urls;
};
return _findURLs(text);
// Copy padutils.urlRegex so that the use of .exec() below (which mutates the RegExp object)
// does not break other concurrent uses of padutils.urlRegex.
const urlRegex = new RegExp(padutils.urlRegex, 'g');
urlRegex.lastIndex = 0;
let urls = null;
let execResult;
// TODO: Switch to String.prototype.matchAll() after support for Node.js < 12.0.0 is dropped.
while ((execResult = urlRegex.exec(text))) {
urls = (urls || []);
const startIndex = execResult.index;
const url = execResult[0];
urls.push([startIndex, url]);
}
return urls;
},
escapeHtmlWithClickableLinks: (text, target) => {
let idx = 0;