FEATURE: HTML to Markdown conversion using native JavaScript ES6 classes (#5425)
This commit is contained in:
Vinoth Kannan
GitHub
parent
0a863dd031
commit
f0497ee9c4
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@ -9,6 +9,7 @@ import { emojiUrlFor } from 'discourse/lib/text';
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import { getRegister } from 'discourse-common/lib/get-owner';
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import { findRawTemplate } from 'discourse/lib/raw-templates';
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import { determinePostReplaceSelection, clipboardData } from 'discourse/lib/utilities';
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import toMarkdown from 'discourse/lib/to-markdown';
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import { ajax } from 'discourse/lib/ajax';
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import { popupAjaxError } from 'discourse/lib/ajax-error';
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import deprecated from 'discourse-common/lib/deprecated';
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@ -647,7 +648,7 @@ export default Ember.Component.extend({
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const { clipboard, types } = clipboardData(e);
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let plainText = clipboard.getData("text/plain");
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const html = clipboard.getData("text/html");
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let html = clipboard.getData("text/html");
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let handled = false;
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if (plainText) {
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@ -657,30 +658,19 @@ export default Ember.Component.extend({
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this.appEvents.trigger('composer:insert-text', table);
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handled = true;
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}
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if (html && html.includes("urn:schemas-microsoft-com:office:word")) {
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html = ""; // use plain text data for microsoft word
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}
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}
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if (this.siteSettings.enable_rich_text_paste && html && !handled) {
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const placeholder = `${ plainText || I18n.t('pasting') }`;
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const self = this;
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const markdown = toMarkdown(html);
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this.appEvents.trigger('composer:insert-text', placeholder);
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if (!plainText || plainText.length < markdown.length) {
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this.appEvents.trigger('composer:insert-text', markdown);
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handled = true;
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ajax('/composer/parse_html', {
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type: 'POST',
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data: { html }
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}).then(response => {
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if (response.markdown) {
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self.appEvents.trigger('composer:replace-text', placeholder, response.markdown);
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} else if (!plainText) {
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self.appEvents.trigger('composer:replace-text', placeholder, "");
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}
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}).catch(error => {
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if (!plainText) {
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self.appEvents.trigger('composer:replace-text', placeholder, "");
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popupAjaxError(error);
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}
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});
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}
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const uploadFiles = types.includes("Files") && !plainText && !handled;
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@ -0,0 +1,285 @@
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import parseHTML from 'discourse/helpers/parse-html';
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const trimLeft = text => text.replace(/^\s+/,"");
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const trimRight = text => text.replace(/\s+$/,"");
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class Tag {
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constructor(name, prefix = "", suffix = "") {
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this.name = name;
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this.prefix = prefix;
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this.suffix = suffix;
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}
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decorate(text) {
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if (this.prefix || this.suffix) {
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return [this.prefix, text, this.suffix].join("");
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}
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return text;
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}
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toMarkdown() {
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const text = this.element.innerMarkdown();
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if (text && text.trim()) {
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return this.decorate(text);
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}
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return text;
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}
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static blocks() {
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return ["address", "article", "aside", "blockquote", "dd", "div", "dl", "dt", "fieldset",
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"figcaption", "figure", "footer", "form", "header", "hgroup", "hr", "main", "nav",
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"ol", "p", "pre", "section", "table", "ul"];
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}
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static headings() {
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return ["h1", "h2", "h3", "h4", "h5", "h6"];
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}
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static emphases() {
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return [ ["b", "**"], ["strong", "**"], ["i", "_"], ["em", "_"], ["s", "~~"], ["strike", "~~"] ];
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}
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static slices() {
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return ["dt", "dd", "tr", "thead", "tbody", "tfoot"];
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}
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static trimmable() {
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return [...Tag.blocks(), ...Tag.headings(), ...Tag.slices(), "li", "td", "th", "br", "hr"];
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}
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static block(name, prefix, suffix) {
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return class extends Tag {
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constructor() {
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super(name, prefix, suffix);
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}
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decorate(text) {
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return `\n\n${this.prefix}${text}${this.suffix}\n\n`;
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}
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};
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}
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static heading(name, i) {
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const prefix = `${[...Array(i)].map(() => "#").join("")} `;
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return Tag.block(name, prefix, "");
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}
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static emphasis(name, decorator) {
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return class extends Tag {
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constructor() {
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super(name, decorator, decorator);
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}
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decorate(text) {
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text = text.trim();
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if (text.includes("\n")) {
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this.prefix = `<${this.name}>`;
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this.suffix = `</${this.name}>`;
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}
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return super.decorate(text);
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}
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};
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}
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static replace(name, text) {
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return class extends Tag {
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constructor() {
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super(name, "", "");
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this.text = text;
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}
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toMarkdown() {
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return this.text;
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}
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};
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}
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static link() {
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return class extends Tag {
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constructor() {
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super("a");
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}
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decorate(text) {
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const attr = this.element.attributes;
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if (attr && attr.href && text !== attr.href) {
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return "[" + text + "](" + attr.href + ")";
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}
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return text;
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}
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};
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}
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static image() {
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return class extends Tag {
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constructor() {
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super("img");
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}
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toMarkdown() {
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const e = this.element;
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const attr = e.attributes;
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const pAttr = e.parent && e.parent.attributes;
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const src = (attr && attr.src) || (pAttr && pAttr.src);
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if (src) {
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const alt = (attr && attr.alt) || (pAttr && pAttr.alt) || "";
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return "![" + alt + "](" + src + ")";
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}
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return "";
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}
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};
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}
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static slice(name, prefix, suffix) {
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return class extends Tag {
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constructor() {
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super(name, prefix, suffix);
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}
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decorate(text) {
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if (!this.element.next) {
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this.suffix = "";
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}
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return `${text}${this.suffix}`;
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}
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};
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}
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static cell(name) {
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return Tag.slice(name, "", " ");
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}
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static li() {
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return class extends Tag.slice("li", "", "\n") {
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decorate(text) {
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const indent = this.element.filterParentNames("ul").slice(1).map(() => " ").join("");
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return super.decorate(`${indent}* ${trimLeft(text)}`);
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}
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};
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}
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}
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const tags = [
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...Tag.blocks().map((b) => Tag.block(b)),
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...Tag.headings().map((h, i) => Tag.heading(h, i + 1)),
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...Tag.slices().map((s) => Tag.slice(s, "", "\n")),
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...Tag.emphases().map((e) => Tag.emphasis(e[0], e[1])),
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Tag.cell("td"), Tag.cell("th"),
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Tag.replace("br", "\n"), Tag.replace("hr", "\n---\n"), Tag.replace("head", ""),
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Tag.li(), Tag.link(), Tag.image(),
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// TO-DO CREATE: code, tbody, ins, del, blockquote, small, large
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// UPDATE: ol, pre, thead, th, td
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];
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class Element {
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constructor(element, parent, previous, next) {
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this.name = element.name;
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this.type = element.type;
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this.data = element.data;
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this.children = element.children;
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this.attributes = element.attributes;
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if (parent) {
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this.parent = parent;
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this.parentNames = (parent.parentNames || []).slice();
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this.parentNames.push(parent.name);
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}
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this.previous = previous;
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this.next = next;
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}
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tag() {
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const tag = new (tags.filter(t => (new t().name === this.name))[0] || Tag)();
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tag.element = this;
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return tag;
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}
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innerMarkdown() {
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return Element.parseChildren(this);
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}
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leftTrimmable() {
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return this.previous && Tag.trimmable().includes(this.previous.name);
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}
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rightTrimmable() {
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return this.next && Tag.trimmable().includes(this.next.name);
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}
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text() {
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let text = this.data || "";
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if (this.leftTrimmable()) {
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text = trimLeft(text);
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}
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if (this.rightTrimmable()) {
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text = trimRight(text);
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}
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text = text.replace(/[ \t]+/g, " ");
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return text;
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}
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toMarkdown() {
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switch(this.type) {
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case "text":
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return this.text();
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break;
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case "tag":
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return this.tag().toMarkdown();
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break;
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}
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}
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filterParentNames(name) {
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return this.parentNames.filter(p => p === name);
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}
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static toMarkdown(element, parent, prev, next) {
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return new Element(element, parent, prev, next).toMarkdown();
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}
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static parseChildren(parent) {
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return Element.parse(parent.children, parent);
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}
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static parse(elements, parent = null) {
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if (elements) {
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let result = [];
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for (let i = 0; i < elements.length; i++) {
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const prev = (i === 0) ? null : elements[i-1];
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const next = (i === elements.length) ? null : elements[i+1];
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result.push(Element.toMarkdown(elements[i], parent, prev, next));
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}
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return result.join("");
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}
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return "";
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}
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}
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export default function toMarkdown(html) {
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try {
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let markdown = Element.parse(parseHTML(html)).trim();
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markdown = markdown.replace(/^<b>/, "").replace(/<\/b>$/, "").trim(); // fix for google doc copy paste
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return markdown.replace(/\r/g, "").replace(/\n \n/g, "\n\n").replace(/\n{3,}/g, "\n\n");
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} catch(err) {
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return "";
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}
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}
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@ -37,3 +37,4 @@
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//= require virtual-dom
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//= require virtual-dom-amd
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//= require highlight.js
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//= require htmlparser.js
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@ -2,7 +2,7 @@ import createStore from 'helpers/create-store';
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QUnit.module("lib:category-link");
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import parseHTML from 'helpers/parse-html';
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import parseHTML from 'discourse/helpers/parse-html';
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import { categoryBadgeHTML } from "discourse/helpers/category-link";
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QUnit.test("categoryBadge without a category", assert => {
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@ -0,0 +1,126 @@
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import toMarkdown from 'discourse/lib/to-markdown';
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QUnit.module("lib:to-markdown");
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QUnit.test("converts styles between normal words", assert => {
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const html = `Line with <s>styles</s> <b><i>between</i></b> words.`;
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const markdown = `Line with ~~styles~~ **_between_** words.`;
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assert.equal(toMarkdown(html), markdown);
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});
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QUnit.test("converts inline nested styles", assert => {
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let html = `<em>Italicised line with <strong>some random</strong> <b>bold</b> words.</em>`;
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let markdown = `_Italicised line with **some random** **bold** words._`;
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assert.equal(toMarkdown(html), markdown);
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html = `<i class="fa">Italicised line
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with <b title="strong">some
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random</b> <s>bold</s> words.</i>`;
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markdown = `<i>Italicised line\n with <b>some\n random</b> ~~bold~~ words.</i>`;
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assert.equal(toMarkdown(html), markdown);
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});
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QUnit.test("converts a link", assert => {
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const html = `<a href="https://discourse.org">Discourse</a>`;
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const markdown = `[Discourse](https://discourse.org)`;
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assert.equal(toMarkdown(html), markdown);
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});
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QUnit.test("put raw URL instead of converting the link", assert => {
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let url = "https://discourse.org";
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const html = () => `<a href="${url}">${url}</a>`;
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assert.equal(toMarkdown(html()), url);
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url = "discourse.org/t/topic-slug/1";
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assert.equal(toMarkdown(html()), url);
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});
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QUnit.test("skip empty link", assert => {
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assert.equal(toMarkdown(`<a href="https://example.com"></a>`), "");
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});
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QUnit.test("converts heading tags", assert => {
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const html = `
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<h1>Heading 1</h1>
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<h2>Heading 2</h2>
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\t <h3>Heading 3</h3>
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<h4>Heading 4</h4>
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<h5>Heading 5</h5>
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<h6>Heading 6</h6>
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`;
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const markdown = `# Heading 1\n\n## Heading 2\n\n### Heading 3\n\n#### Heading 4\n\n##### Heading 5\n\n###### Heading 6`;
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assert.equal(toMarkdown(html), markdown);
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});
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QUnit.test("converts ul and ol list tags", assert => {
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const html = `
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<ul>
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<li>Item 1</li>
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<li>
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Item 2
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<ul>
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<li>Sub Item 1</li>
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<li>Sub Item 2</li>
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<ul><li>Sub <i>Sub</i> Item 1</li><li>Sub <b>Sub</b> Item 2</li></ul>
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</ul>
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</li>
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<li>Item 3</li>
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</ul>
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`;
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const markdown = `* Item 1\n* Item 2\n\n * Sub Item 1\n * Sub Item 2\n\n * Sub _Sub_ Item 1\n * Sub **Sub** Item 2\n\n* Item 3`;
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assert.equal(toMarkdown(html), markdown);
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});
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QUnit.test("stripes unwanted inline tags", assert => {
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const html = `
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<p>Lorem ipsum <span>dolor sit amet, consectetur</span> <strike>elit.</strike></p>
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<p>Ut minim veniam, <label>quis nostrud</label> laboris <nisi> ut aliquip ex ea</nisi> commodo.</p>
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`;
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const markdown = `Lorem ipsum dolor sit amet, consectetur ~~elit.~~\n\nUt minim veniam, quis nostrud laboris ut aliquip ex ea commodo.`;
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assert.equal(toMarkdown(html), markdown);
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});
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QUnit.test("converts table as readable", assert => {
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const html = `<address>Discourse Avenue</address><b>laboris</b>
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<table>
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<thead> <tr><th>Heading 1</th><th>Head 2</th></tr> </thead>
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<tbody>
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<tr><td>Lorem</td><td>ipsum</td></tr>
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<tr><td><b>dolor</b></td> <td><i>sit amet</i></td></tr></tbody>
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</table>
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`;
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const markdown = `Discourse Avenue\n\n**laboris**\n\nHeading 1 Head 2\n\nLorem ipsum\n**dolor** _sit amet_`;
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assert.equal(toMarkdown(html), markdown);
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});
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QUnit.test("converts img tag", assert => {
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const url = "https://example.com/image.png";
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let html = `<img src="${url}">`;
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assert.equal(toMarkdown(html), ``);
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html = `<div><span><img src="${url}" alt="description" /></span></div>`;
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assert.equal(toMarkdown(html), ``);
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html = `<a href="http://example.com"><img src="${url}" alt="description" /></a>`;
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assert.equal(toMarkdown(html), `[](http://example.com)`);
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html = `<a href="http://example.com">description <img src="${url}" /></a>`;
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assert.equal(toMarkdown(html), `[description ](http://example.com)`);
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html = `<img alt="description" />`;
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assert.equal(toMarkdown(html), "");
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html = `<a><img src="${url}" alt="description" /></a>`;
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assert.equal(toMarkdown(html), ``);
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});
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