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