wrapped inside (not inline)
var pre = env.element.parentNode;
var clsReg = /\s*\bline-numbers\b\s*/;
if (
!pre || !/pre/i.test(pre.nodeName) ||
// Abort only if nor the nor the have the class
(!clsReg.test(pre.className) && !clsReg.test(env.element.className))
) {
return;
}
if (env.element.querySelector(".line-numbers-rows")) {
// Abort if line numbers already exists
return;
}
if (clsReg.test(env.element.className)) {
// Remove the class "line-numbers" from the
env.element.className = env.element.className.replace(clsReg, '');
}
if (!clsReg.test(pre.className)) {
// Add the class "line-numbers" to the
pre.className += ' line-numbers';
}
var match = env.code.match(/\n(?!$)/g);
var linesNum = match ? match.length + 1 : 1;
var lineNumbersWrapper;
var lines = new Array(linesNum + 1);
lines = lines.join('');
lineNumbersWrapper = document.createElement('span');
lineNumbersWrapper.className = 'line-numbers-rows';
lineNumbersWrapper.innerHTML = lines;
if (pre.hasAttribute('data-start')) {
pre.style.counterReset = 'linenumber ' + (parseInt(pre.getAttribute('data-start'), 10) - 1);
}
env.element.appendChild(lineNumbersWrapper);
});
}());