Method _getReplacement

src/prism.js:269–272

(passedBlock, replaceBlock, matchName)

                 * @param {string|null} matchName
                 */
                const _getReplacement = function(passedBlock, replaceBlock, matchName) {
                    replacement = replaceAtPosition(indexOfGroup(match, groupKey), passedBlock, matchName ? _wrapCodeInSpan(matchName, replaceBlock) : replaceBlock, replacement);
                    return;
                };

                // If this is a string then this match is directly mapped
                // to selector so all we have to do is wrap it in a span