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import OrderedMap from 'orderedmap';
import { Extension } from '@tiptap/core';
import { Plugin, PluginKey } from '@tiptap/pm/state';
import { Schema, DOMParser as ProseMirrorDOMParser, DOMSerializer } from '@tiptap/pm/model';
import { __ } from '~/locale';
import { VARIANT_DANGER } from '~/alert';
import createMarkdownDeserializer from '../services/gl_api_markdown_deserializer';
import { ALERT_EVENT, EXTENSION_PRIORITY_HIGHEST } from '../constants';
import CodeBlockHighlight from './code_block_highlight';
import Diagram from './diagram';
import Frontmatter from './frontmatter';
const TEXT_FORMAT = 'text/plain';
const GFM_FORMAT = 'text/x-gfm';
const HTML_FORMAT = 'text/html';
const VS_CODE_FORMAT = 'vscode-editor-data';
const CODE_BLOCK_NODE_TYPES = [CodeBlockHighlight.name, Diagram.name, Frontmatter.name];
function parseHTML(schema, html) {
const parser = new DOMParser();
const startTag = '<body>';
const endTag = '</body>';
const { body } = parser.parseFromString(startTag + html + endTag, 'text/html');
return { document: ProseMirrorDOMParser.fromSchema(schema).parse(body) };
}
export default Extension.create({
name: 'pasteMarkdown',
priority: EXTENSION_PRIORITY_HIGHEST,
addOptions() {
return {
renderMarkdown: null,
serializer: null,
};
},
addCommands() {
return {
pasteContent: (content = '', processMarkdown = true) => async () => {
const { editor, options } = this;
const { renderMarkdown, eventHub } = options;
const deserializer = createMarkdownDeserializer({ render: renderMarkdown });
const pasteSchemaSpec = { ...editor.schema.spec };
pasteSchemaSpec.marks = OrderedMap.from(pasteSchemaSpec.marks).remove('span');
pasteSchemaSpec.nodes = OrderedMap.from(pasteSchemaSpec.nodes).remove('div').remove('pre');
const schema = new Schema(pasteSchemaSpec);
const promise = processMarkdown
? deserializer.deserialize({ schema, markdown: content })
: Promise.resolve(parseHTML(schema, content));
promise
.then(({ document }) => {
if (!document) return;
const { firstChild } = document.content;
const toPaste =
document.content.childCount === 1 && firstChild.type.name === 'paragraph'
? firstChild.content
: document.content;
editor.commands.insertContent(toPaste.toJSON());
})
.catch(() => {
eventHub.$emit(ALERT_EVENT, {
message: __('An error occurred while pasting text in the editor. Please try again.'),
variant: VARIANT_DANGER,
});
});
return true;
},
};
},
addProseMirrorPlugins() {
let pasteRaw = false;
const handleCutAndCopy = (view, event) => {
const slice = view.state.selection.content();
const gfmContent = this.options.serializer.serialize({ doc: slice.content });
const documentFragment = DOMSerializer.fromSchema(view.state.schema).serializeFragment(
slice.content,
);
const div = document.createElement('div');
div.appendChild(documentFragment);
event.clipboardData.setData(TEXT_FORMAT, div.innerText);
event.clipboardData.setData(HTML_FORMAT, div.innerHTML);
event.clipboardData.setData(GFM_FORMAT, gfmContent);
event.preventDefault();
event.stopPropagation();
};
return [
new Plugin({
key: new PluginKey('pasteMarkdown'),
props: {
handleDOMEvents: {
copy: handleCutAndCopy,
cut: (view, event) => {
handleCutAndCopy(view, event);
this.editor.commands.deleteSelection();
},
},
handleKeyDown: (_, event) => {
pasteRaw = event.key === 'v' && (event.metaKey || event.ctrlKey) && event.shiftKey;
},
handlePaste: (view, event) => {
const { clipboardData } = event;
const gfmContent = clipboardData.getData(GFM_FORMAT);
if (gfmContent) {
return this.editor.commands.pasteContent(gfmContent, true);
}
const textContent = clipboardData.getData(TEXT_FORMAT);
const htmlContent = clipboardData.getData(HTML_FORMAT);
const { from, to } = view.state.selection;
if (pasteRaw) {
this.editor.commands.insertContentAt(
{ from, to },
textContent.replace(/^\s+|\s+$/gm, ''),
);
return true;
}
const hasHTML = clipboardData.types.some((type) => type === HTML_FORMAT);
const hasVsCode = clipboardData.types.some((type) => type === VS_CODE_FORMAT);
const vsCodeMeta = hasVsCode ? JSON.parse(clipboardData.getData(VS_CODE_FORMAT)) : {};
const language = vsCodeMeta.mode;
// if a code block is active, paste as plain text
if (!textContent || CODE_BLOCK_NODE_TYPES.some((type) => this.editor.isActive(type))) {
return false;
}
if (hasVsCode) {
return this.editor.commands.pasteContent(
language === 'markdown' ? textContent : `\`\`\`${language}\n${textContent}\n\`\`\``,
true,
);
}
return this.editor.commands.pasteContent(hasHTML ? htmlContent : textContent, !hasHTML);
},
},
}),
];
},
});
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