mirror of https://github.com/jkjoy/sunpeiwen.git
127 lines
3.4 KiB
JavaScript
127 lines
3.4 KiB
JavaScript
(function () {
|
|
|
|
if (typeof Prism === 'undefined' || typeof document === 'undefined' || !document.createRange) {
|
|
return;
|
|
}
|
|
|
|
Prism.plugins.KeepMarkup = true;
|
|
|
|
Prism.hooks.add('before-highlight', function (env) {
|
|
if (!env.element.children.length) {
|
|
return;
|
|
}
|
|
|
|
if (!Prism.util.isActive(env.element, 'keep-markup', true)) {
|
|
return;
|
|
}
|
|
|
|
var dropTokens = Prism.util.isActive(env.element, 'drop-tokens', false);
|
|
/**
|
|
* Returns whether the given element should be kept.
|
|
*
|
|
* @param {HTMLElement} element
|
|
* @returns {boolean}
|
|
*/
|
|
function shouldKeep(element) {
|
|
if (dropTokens && element.nodeName.toLowerCase() === 'span' && element.classList.contains('token')) {
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
var pos = 0;
|
|
var data = [];
|
|
function processElement(element) {
|
|
if (!shouldKeep(element)) {
|
|
// don't keep this element and just process its children
|
|
processChildren(element);
|
|
return;
|
|
}
|
|
|
|
var o = {
|
|
// Store original element so we can restore it after highlighting
|
|
element: element,
|
|
posOpen: pos
|
|
};
|
|
data.push(o);
|
|
|
|
processChildren(element);
|
|
|
|
o.posClose = pos;
|
|
}
|
|
function processChildren(element) {
|
|
for (var i = 0, l = element.childNodes.length; i < l; i++) {
|
|
var child = element.childNodes[i];
|
|
if (child.nodeType === 1) { // element
|
|
processElement(child);
|
|
} else if (child.nodeType === 3) { // text
|
|
pos += child.data.length;
|
|
}
|
|
}
|
|
}
|
|
processChildren(env.element);
|
|
|
|
if (data.length) {
|
|
// data is an array of all existing tags
|
|
env.keepMarkup = data;
|
|
}
|
|
});
|
|
|
|
Prism.hooks.add('after-highlight', function (env) {
|
|
if (env.keepMarkup && env.keepMarkup.length) {
|
|
|
|
var walk = function (elt, nodeState) {
|
|
for (var i = 0, l = elt.childNodes.length; i < l; i++) {
|
|
|
|
var child = elt.childNodes[i];
|
|
|
|
if (child.nodeType === 1) { // element
|
|
if (!walk(child, nodeState)) {
|
|
return false;
|
|
}
|
|
|
|
} else if (child.nodeType === 3) { // text
|
|
if (!nodeState.nodeStart && nodeState.pos + child.data.length > nodeState.node.posOpen) {
|
|
// We found the start position
|
|
nodeState.nodeStart = child;
|
|
nodeState.nodeStartPos = nodeState.node.posOpen - nodeState.pos;
|
|
}
|
|
if (nodeState.nodeStart && nodeState.pos + child.data.length >= nodeState.node.posClose) {
|
|
// We found the end position
|
|
nodeState.nodeEnd = child;
|
|
nodeState.nodeEndPos = nodeState.node.posClose - nodeState.pos;
|
|
}
|
|
|
|
nodeState.pos += child.data.length;
|
|
}
|
|
|
|
if (nodeState.nodeStart && nodeState.nodeEnd) {
|
|
// Select the range and wrap it with the element
|
|
var range = document.createRange();
|
|
range.setStart(nodeState.nodeStart, nodeState.nodeStartPos);
|
|
range.setEnd(nodeState.nodeEnd, nodeState.nodeEndPos);
|
|
nodeState.node.element.innerHTML = '';
|
|
nodeState.node.element.appendChild(range.extractContents());
|
|
range.insertNode(nodeState.node.element);
|
|
range.detach();
|
|
|
|
// Process is over
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
};
|
|
|
|
// For each tag, we walk the DOM to reinsert it
|
|
env.keepMarkup.forEach(function (node) {
|
|
walk(env.element, {
|
|
node: node,
|
|
pos: 0
|
|
});
|
|
});
|
|
// Store new highlightedCode for later hooks calls
|
|
env.highlightedCode = env.element.innerHTML;
|
|
}
|
|
});
|
|
}());
|