58 lines
1.5 KiB
JavaScript
58 lines
1.5 KiB
JavaScript
function escapeRegexp(text) {
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return text.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&');
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}
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export function censorFn(censoredWords, censoredPattern, replacementLetter) {
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let patterns = [];
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replacementLetter = replacementLetter || "■";
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if (censoredWords && censoredWords.length) {
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patterns = censoredWords.split("|").map(t => `(${escapeRegexp(t)})`);
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}
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if (censoredPattern && censoredPattern.length > 0) {
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patterns.push("(" + censoredPattern + ")");
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}
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if (patterns.length) {
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let censorRegexp;
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try {
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censorRegexp = new RegExp("(\\b(?:" + patterns.join("|") + ")\\b)(?![^\\(]*\\))", "ig");
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if (censorRegexp) {
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return function(text) {
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let original = text;
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try {
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let m = censorRegexp.exec(text);
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while (m && m[0]) {
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if (m[0].length > original.length) { return original; } // regex is dangerous
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const replacement = new Array(m[0].length+1).join(replacementLetter);
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text = text.replace(new RegExp(`(\\b${escapeRegexp(m[0])}\\b)(?![^\\(]*\\))`, "ig"), replacement);
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m = censorRegexp.exec(text);
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}
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return text;
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} catch (e) {
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return original;
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}
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};
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}
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} catch(e) {
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// fall through
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}
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}
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return function(t){ return t;};
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}
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export function censor(text, censoredWords, censoredPattern, replacementLetter) {
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return censorFn(censoredWords, censoredPattern, replacementLetter)(text);
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}
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