43 lines
1.7 KiB
TypeScript
43 lines
1.7 KiB
TypeScript
/* Adapted from: To Title Case © 2018 David Gouch | https://github.com/gouch/to-title-case */
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// eslint-disable-next-line no-extend-native
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export function to_title_case(text_string) {
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// console.log('*** to_title_case() ***');
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let smallWords = /^(a|an|and|as|at|but|by|en|for|if|in|nor|of|on|or|per|the|to|v.?|vs.?|via)$/i;
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let alphanumericPattern = /([A-Za-z0-9\u00C0-\u00FF])/;
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let wordSeparators = /([ :–—-])/;
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return text_string.split(wordSeparators)
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.map(function (current, index, array) {
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if (
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/* Check for small words */
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current.search(smallWords) > -1 &&
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/* Skip first and last word */
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index !== 0 &&
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index !== array.length - 1 &&
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/* Ignore title end and subtitle start */
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array[index - 3] !== ':' &&
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array[index + 1] !== ':' &&
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/* Ignore small words that start a hyphenated phrase */
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(array[index + 1] !== '-' ||
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(array[index - 1] === '-' && array[index + 1] === '-'))) {
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return current.toLowerCase();
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}
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/* Ignore intentional capitalization */
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if (current.substr(1).search(/[A-Z]|\../) > -1) {
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return current;
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}
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/* Ignore URLs */
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if (array[index + 1] === ':' && array[index + 2] !== '') {
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return current;
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}
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/* Capitalize the first letter */
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return current.replace(alphanumericPattern, function (match) {
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return match.toUpperCase();
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});
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})
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.join('');
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}
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