51 lines
1.4 KiB
JavaScript
51 lines
1.4 KiB
JavaScript
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/**
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* @fileoverview Interpolate keys from an object into a string with {{ }} markers.
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* @author Jed Fox
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Public Interface
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//------------------------------------------------------------------------------
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/**
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* Returns a global expression matching placeholders in messages.
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* @returns {RegExp} Global regular expression matching placeholders
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*/
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function getPlaceholderMatcher() {
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return /\{\{([^{}]+?)\}\}/gu;
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}
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/**
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* Replaces {{ placeholders }} in the message with the provided data.
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* Does not replace placeholders not available in the data.
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* @param {string} text Original message with potential placeholders
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* @param {Record<string, string>} data Map of placeholder name to its value
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* @returns {string} Message with replaced placeholders
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*/
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function interpolate(text, data) {
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if (!data) {
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return text;
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}
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const matcher = getPlaceholderMatcher();
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// Substitution content for any {{ }} markers.
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return text.replace(matcher, (fullMatch, termWithWhitespace) => {
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const term = termWithWhitespace.trim();
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if (term in data) {
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return data[term];
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}
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// Preserve old behavior: If parameter name not provided, don't replace it.
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return fullMatch;
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});
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}
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module.exports = {
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getPlaceholderMatcher,
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interpolate
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};
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