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75 lines
1.7 KiB
JavaScript
75 lines
1.7 KiB
JavaScript
function pregQuote(str, delimiter = '') {
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return (`${str}`).replace(new RegExp(`[.\\\\+*?\\[\\^\\]$(){}=!<>|:\\${delimiter || ''}-]`, 'g'), '\\$&');
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}
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function replaceRegexDiacritics(regexString) {
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if (!regexString) return '';
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const diacriticReplacements = {
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a: '[aàáâãäåāą]',
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A: '[AÀÁÂÃÄÅĀĄ]',
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c: '[cçćč]',
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C: '[CÇĆČ]',
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d: '[dđď]',
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D: '[DĐĎ]',
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e: '[eèéêëěēę]',
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E: '[EÈÉÊËĚĒĘ]',
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i: '[iìíîïī]',
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I: '[IÌÍÎÏĪ]',
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l: '[lł]',
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L: '[LŁ]',
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n: '[nñňń]',
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N: '[NÑŇŃ]',
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o: '[oòóôõöøō]',
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O: '[OÒÓÔÕÖØŌ]',
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r: '[rř]',
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R: '[RŘ]',
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s: '[sšś]',
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S: '[SŠŚ]',
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t: '[tť]',
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T: '[TŤ]',
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u: '[uùúûüůū]',
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U: '[UÙÚÛÜŮŪ]',
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y: '[yÿý]',
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Y: '[YŸÝ]',
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z: '[zžżź]',
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Z: '[ZŽŻŹ]',
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};
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let output = '';
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for (let i = 0; i < regexString.length; i++) {
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const c = regexString[i];
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const r = diacriticReplacements[c];
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if (r) {
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output += r;
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} else {
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output += c;
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}
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}
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return output;
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}
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// keywords can either be a list of strings, or a list of objects with the format:
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// { value: 'actualkeyword', type: 'regex/string' }
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// The function surrounds the keywords wherever they are, even within other words.
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function surroundKeywords(keywords, text, prefix, suffix) {
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if (!keywords.length) return text;
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let regexString = keywords
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.map(k => {
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if (k.type === 'regex') {
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return replaceRegexDiacritics(k.valueRegex);
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} else {
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const value = typeof k === 'string' ? k : k.value;
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return replaceRegexDiacritics(pregQuote(value));
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}
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})
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.join('|');
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regexString = `(${regexString})`;
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const re = new RegExp(regexString, 'gi');
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return text.replace(re, `${prefix}$1${suffix}`);
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}
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module.exports = { surroundKeywords };
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