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function quoteReply(path, selectorForContentElement, textFormatting) {
const contentElement = $(selectorForContentElement).get(0);
const selectedRange = QuoteExtractor.extract(contentElement);
let formatter;
if (textFormatting === 'common_mark') {
formatter = new QuoteCommonMarkFormatter();
} else {
formatter = new QuoteTextFormatter();
}
$.ajax({
url: path,
type: 'post',
data: { quote: formatter.format(selectedRange) }
});
}
class QuoteExtractor {
static extract(targetElement) {
return new QuoteExtractor(targetElement).extract();
}
constructor(targetElement) {
this.targetElement = targetElement;
this.selection = window.getSelection();
}
extract() {
const range = this.retriveSelectedRange();
if (!range) {
return null;
}
if (!this.targetElement.contains(range.startContainer)) {
range.setStartBefore(this.targetElement);
}
if (!this.targetElement.contains(range.endContainer)) {
range.setEndAfter(this.targetElement);
}
return range;
}
retriveSelectedRange() {
if (!this.isSelected) {
return null;
}
// Retrive the first range that intersects with the target element.
// NOTE: Firefox allows to select multiple ranges in the document.
for (let i = 0; i < this.selection.rangeCount; i++) {
let range = this.selection.getRangeAt(i);
if (range.intersectsNode(this.targetElement)) {
return range;
}
}
return null;
}
get isSelected() {
return this.selection.containsNode(this.targetElement, true);
}
}
class QuoteTextFormatter {
format(selectedRange) {
if (!selectedRange) {
return null;
}
const fragment = document.createElement('div');
fragment.appendChild(selectedRange.cloneContents());
// Remove all unnecessary anchor elements
fragment.querySelectorAll('a.wiki-anchor').forEach(e => e.remove());
const html = this.adjustLineBreaks(fragment.innerHTML);
const result = document.createElement('div');
result.innerHTML = html;
// Replace continuous line breaks with a single line break and remove tab characters
return result.textContent
.trim()
.replace(/\t/g, '')
.replace(/\n+/g, "\n");
}
adjustLineBreaks(html) {
return html
.replace(/<\/(h1|h2|h3|h4|div|p|li|tr)>/g, "\n</$1>")
.replace(/<br>/g, "\n")
}
}
class QuoteCommonMarkFormatter {
format(selectedRange) {
if (!selectedRange) {
return null;
}
const htmlFragment = this.extractHtmlFragmentFrom(selectedRange);
const preparedHtml = this.prepareHtml(htmlFragment);
return this.convertHtmlToCommonMark(preparedHtml);
}
extractHtmlFragmentFrom(range) {
const fragment = document.createElement('div');
const ancestorNodeName = range.commonAncestorContainer.nodeName;
if (ancestorNodeName == 'CODE' || ancestorNodeName == '#text') {
fragment.appendChild(this.wrapPreCode(range));
} else {
fragment.appendChild(range.cloneContents());
}
return fragment;
}
// When only the content within the `<code>` element is selected,
// the HTML within the selection range does not include the `<pre><code>` element itself.
// To create a complete code block, wrap the selected content with the `<pre><code>` tags.
//
// selected contentes => <pre><code class="ruby">selected contents</code></pre>
wrapPreCode(range) {
const rangeAncestor = range.commonAncestorContainer;
let codeElement = null;
if (rangeAncestor.nodeName == 'CODE') {
codeElement = rangeAncestor;
} else {
codeElement = rangeAncestor.parentElement.closest('code');
}
if (!codeElement) {
return range.cloneContents();
}
const pre = document.createElement('pre');
const code = codeElement.cloneNode(false);
code.appendChild(range.cloneContents());
pre.appendChild(code);
return pre;
}
convertHtmlToCommonMark(html) {
const turndownService = new TurndownService({
codeBlockStyle: 'fenced',
headingStyle: 'atx'
});
turndownService.addRule('del', {
filter: ['del'],
replacement: content => `~~${content}~~`
});
turndownService.addRule('checkList', {
filter: node => {
return node.type === 'checkbox' && node.parentNode.nodeName === 'LI';
},
replacement: (content, node) => {
return node.checked ? '[x]' : '[ ]';
}
});
// Table does not maintain its original format,
// and the text within the table is displayed as it is
//
// | A | B | C |
// |---|---|---|
// | 1 | 2 | 3 |
// =>
// A B C
// 1 2 3
turndownService.addRule('table', {
filter: ['td', 'th'],
replacement: (content, node) => {
const separator = node.parentElement.lastElementChild === node ? '' : ' ';
return content + separator;
}
});
turndownService.addRule('tableHeading', {
filter: ['thead', 'tbody', 'tfoot', 'tr'],
replacement: (content, _node) => content
});
turndownService.addRule('tableRow', {
filter: ['tr'],
replacement: (content, _node) => {
return content + '\n'
}
});
return turndownService.turndown(html);
}
prepareHtml(htmlFragment) {
// Remove all anchor elements.
// <h1>Title1<a href="#Title" class="wiki-anchor">¶</a></h1> => <h1>Title1</h1>
htmlFragment.querySelectorAll('a.wiki-anchor').forEach(e => e.remove());
// Convert code highlight blocks to CommonMark format code blocks.
// <code class="ruby" data-language="ruby"> => <code class="language-ruby" data-language="ruby">
htmlFragment.querySelectorAll('code[data-language]').forEach(e => {
e.classList.replace(e.dataset['language'], 'language-' + e.dataset['language'])
});
return htmlFragment.innerHTML;
}
}
|
