39 lines
1.3 KiB
JavaScript
39 lines
1.3 KiB
JavaScript
/**
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* @copyright 2020, the Converse.js contributors
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* @license Mozilla Public License (MPLv2)
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* @description Pure functions to help functionally parse messages.
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* @todo Other parsing helpers can be made more abstract and placed here.
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*/
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const helpers = {};
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const escapeRegexChars = (string, char) => string.replace(RegExp('\\' + char, 'ig'), '\\' + char);
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helpers.escapeCharacters = characters => string =>
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characters.split('').reduce(escapeRegexChars, string);
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helpers.escapeRegexString = helpers.escapeCharacters('[\\^$.?*+(){}|');
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// `for` is ~25% faster than using `Array.find()`
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helpers.findFirstMatchInArray = array => text => {
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for (let i = 0; i < array.length; i++) {
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if (text.localeCompare(array[i], undefined, {sensitivity: 'base'}) === 0) {
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return array[i];
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}
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}
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return null;
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};
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const reduceReferences = ([text, refs], ref, index) => {
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let updated_text = text;
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let { begin, end } = ref;
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const { value } = ref;
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begin = begin - index;
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end = end - index - 1; // -1 to compensate for the removed @
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updated_text = `${updated_text.slice(0, begin)}${value}${updated_text.slice(end + 1)}`;
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return [updated_text, [...refs, { ...ref, begin, end }]]
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}
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helpers.reduceTextFromReferences = (text, refs) => refs.reduce(reduceReferences, [text, []]);
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export default helpers;
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