hexo/node_modules/prismjs/plugins/line-highlight/prism-line-highlight.js

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JavaScript
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2023-09-25 15:58:56 +08:00
(function () {
if (typeof Prism === 'undefined' || typeof document === 'undefined' || !document.querySelector) {
return;
}
var LINE_NUMBERS_CLASS = 'line-numbers';
var LINKABLE_LINE_NUMBERS_CLASS = 'linkable-line-numbers';
var NEW_LINE_EXP = /\n(?!$)/g;
/**
* @param {string} selector
* @param {ParentNode} [container]
* @returns {HTMLElement[]}
*/
function $$(selector, container) {
return Array.prototype.slice.call((container || document).querySelectorAll(selector));
}
/**
* Returns whether the given element has the given class.
*
* @param {Element} element
* @param {string} className
* @returns {boolean}
*/
function hasClass(element, className) {
return element.classList.contains(className);
}
/**
* Calls the given function.
*
* @param {() => any} func
* @returns {void}
*/
function callFunction(func) {
func();
}
// Some browsers round the line-height, others don't.
// We need to test for it to position the elements properly.
var isLineHeightRounded = (function () {
var res;
return function () {
if (typeof res === 'undefined') {
var d = document.createElement('div');
d.style.fontSize = '13px';
d.style.lineHeight = '1.5';
d.style.padding = '0';
d.style.border = '0';
d.innerHTML = '&nbsp;<br />&nbsp;';
document.body.appendChild(d);
// Browsers that round the line-height should have offsetHeight === 38
// The others should have 39.
res = d.offsetHeight === 38;
document.body.removeChild(d);
}
return res;
};
}());
/**
* Returns the top offset of the content box of the given parent and the content box of one of its children.
*
* @param {HTMLElement} parent
* @param {HTMLElement} child
*/
function getContentBoxTopOffset(parent, child) {
var parentStyle = getComputedStyle(parent);
var childStyle = getComputedStyle(child);
/**
* Returns the numeric value of the given pixel value.
*
* @param {string} px
*/
function pxToNumber(px) {
return +px.substr(0, px.length - 2);
}
return child.offsetTop
+ pxToNumber(childStyle.borderTopWidth)
+ pxToNumber(childStyle.paddingTop)
- pxToNumber(parentStyle.paddingTop);
}
/**
* Returns whether the Line Highlight plugin is active for the given element.
*
* If this function returns `false`, do not call `highlightLines` for the given element.
*
* @param {HTMLElement | null | undefined} pre
* @returns {boolean}
*/
function isActiveFor(pre) {
if (!pre || !/pre/i.test(pre.nodeName)) {
return false;
}
if (pre.hasAttribute('data-line')) {
return true;
}
if (pre.id && Prism.util.isActive(pre, LINKABLE_LINE_NUMBERS_CLASS)) {
// Technically, the line numbers plugin is also necessary but this plugin doesn't control the classes of
// the line numbers plugin, so we can't assume that they are present.
return true;
}
return false;
}
var scrollIntoView = true;
Prism.plugins.lineHighlight = {
/**
* Highlights the lines of the given pre.
*
* This function is split into a DOM measuring and mutate phase to improve performance.
* The returned function mutates the DOM when called.
*
* @param {HTMLElement} pre
* @param {string | null} [lines]
* @param {string} [classes='']
* @returns {() => void}
*/
highlightLines: function highlightLines(pre, lines, classes) {
lines = typeof lines === 'string' ? lines : (pre.getAttribute('data-line') || '');
var ranges = lines.replace(/\s+/g, '').split(',').filter(Boolean);
var offset = +pre.getAttribute('data-line-offset') || 0;
var parseMethod = isLineHeightRounded() ? parseInt : parseFloat;
var lineHeight = parseMethod(getComputedStyle(pre).lineHeight);
var hasLineNumbers = Prism.util.isActive(pre, LINE_NUMBERS_CLASS);
var codeElement = pre.querySelector('code');
var parentElement = hasLineNumbers ? pre : codeElement || pre;
var mutateActions = /** @type {(() => void)[]} */ ([]);
var lineBreakMatch = codeElement.textContent.match(NEW_LINE_EXP);
var numberOfLines = lineBreakMatch ? lineBreakMatch.length + 1 : 1;
/**
* The top offset between the content box of the <code> element and the content box of the parent element of
* the line highlight element (either `<pre>` or `<code>`).
*
* This offset might not be zero for some themes where the <code> element has a top margin. Some plugins
* (or users) might also add element above the <code> element. Because the line highlight is aligned relative
* to the <pre> element, we have to take this into account.
*
* This offset will be 0 if the parent element of the line highlight element is the `<code>` element.
*/
var codePreOffset = !codeElement || parentElement == codeElement ? 0 : getContentBoxTopOffset(pre, codeElement);
ranges.forEach(function (currentRange) {
var range = currentRange.split('-');
var start = +range[0];
var end = +range[1] || start;
end = Math.min(numberOfLines + offset, end);
if (end < start) {
return;
}
/** @type {HTMLElement} */
var line = pre.querySelector('.line-highlight[data-range="' + currentRange + '"]') || document.createElement('div');
mutateActions.push(function () {
line.setAttribute('aria-hidden', 'true');
line.setAttribute('data-range', currentRange);
line.className = (classes || '') + ' line-highlight';
});
// if the line-numbers plugin is enabled, then there is no reason for this plugin to display the line numbers
if (hasLineNumbers && Prism.plugins.lineNumbers) {
var startNode = Prism.plugins.lineNumbers.getLine(pre, start);
var endNode = Prism.plugins.lineNumbers.getLine(pre, end);
if (startNode) {
var top = startNode.offsetTop + codePreOffset + 'px';
mutateActions.push(function () {
line.style.top = top;
});
}
if (endNode) {
var height = (endNode.offsetTop - startNode.offsetTop) + endNode.offsetHeight + 'px';
mutateActions.push(function () {
line.style.height = height;
});
}
} else {
mutateActions.push(function () {
line.setAttribute('data-start', String(start));
if (end > start) {
line.setAttribute('data-end', String(end));
}
line.style.top = (start - offset - 1) * lineHeight + codePreOffset + 'px';
line.textContent = new Array(end - start + 2).join(' \n');
});
}
mutateActions.push(function () {
line.style.width = pre.scrollWidth + 'px';
});
mutateActions.push(function () {
// allow this to play nicely with the line-numbers plugin
// need to attack to pre as when line-numbers is enabled, the code tag is relatively which screws up the positioning
parentElement.appendChild(line);
});
});
var id = pre.id;
if (hasLineNumbers && Prism.util.isActive(pre, LINKABLE_LINE_NUMBERS_CLASS) && id) {
// This implements linkable line numbers. Linkable line numbers use Line Highlight to create a link to a
// specific line. For this to work, the pre element has to:
// 1) have line numbers,
// 2) have the `linkable-line-numbers` class or an ascendant that has that class, and
// 3) have an id.
if (!hasClass(pre, LINKABLE_LINE_NUMBERS_CLASS)) {
// add class to pre
mutateActions.push(function () {
pre.classList.add(LINKABLE_LINE_NUMBERS_CLASS);
});
}
var start = parseInt(pre.getAttribute('data-start') || '1');
// iterate all line number spans
$$('.line-numbers-rows > span', pre).forEach(function (lineSpan, i) {
var lineNumber = i + start;
lineSpan.onclick = function () {
var hash = id + '.' + lineNumber;
// this will prevent scrolling since the span is obviously in view
scrollIntoView = false;
location.hash = hash;
setTimeout(function () {
scrollIntoView = true;
}, 1);
};
});
}
return function () {
mutateActions.forEach(callFunction);
};
}
};
function applyHash() {
var hash = location.hash.slice(1);
// Remove pre-existing temporary lines
$$('.temporary.line-highlight').forEach(function (line) {
line.parentNode.removeChild(line);
});
var range = (hash.match(/\.([\d,-]+)$/) || [, ''])[1];
if (!range || document.getElementById(hash)) {
return;
}
var id = hash.slice(0, hash.lastIndexOf('.'));
var pre = document.getElementById(id);
if (!pre) {
return;
}
if (!pre.hasAttribute('data-line')) {
pre.setAttribute('data-line', '');
}
var mutateDom = Prism.plugins.lineHighlight.highlightLines(pre, range, 'temporary ');
mutateDom();
if (scrollIntoView) {
document.querySelector('.temporary.line-highlight').scrollIntoView();
}
}
var fakeTimer = 0; // Hack to limit the number of times applyHash() runs
Prism.hooks.add('before-sanity-check', function (env) {
var pre = env.element.parentElement;
if (!isActiveFor(pre)) {
return;
}
/*
* Cleanup for other plugins (e.g. autoloader).
*
* Sometimes <code> blocks are highlighted multiple times. It is necessary
* to cleanup any left-over tags, because the whitespace inside of the <div>
* tags change the content of the <code> tag.
*/
var num = 0;
$$('.line-highlight', pre).forEach(function (line) {
num += line.textContent.length;
line.parentNode.removeChild(line);
});
// Remove extra whitespace
if (num && /^(?: \n)+$/.test(env.code.slice(-num))) {
env.code = env.code.slice(0, -num);
}
});
Prism.hooks.add('complete', function completeHook(env) {
var pre = env.element.parentElement;
if (!isActiveFor(pre)) {
return;
}
clearTimeout(fakeTimer);
var hasLineNumbers = Prism.plugins.lineNumbers;
var isLineNumbersLoaded = env.plugins && env.plugins.lineNumbers;
if (hasClass(pre, LINE_NUMBERS_CLASS) && hasLineNumbers && !isLineNumbersLoaded) {
Prism.hooks.add('line-numbers', completeHook);
} else {
var mutateDom = Prism.plugins.lineHighlight.highlightLines(pre);
mutateDom();
fakeTimer = setTimeout(applyHash, 1);
}
});
window.addEventListener('hashchange', applyHash);
window.addEventListener('resize', function () {
var actions = $$('pre')
.filter(isActiveFor)
.map(function (pre) {
return Prism.plugins.lineHighlight.highlightLines(pre);
});
actions.forEach(callFunction);
});
}());