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* The coLAB project
* Copyright (C) 2021-2023 AlbaSim, MEI, HEIG-VD, HES-SO
*
* Licensed under the MIT License
*/
import { getLogger } from '../../../../logger';
import { HeadingLevel } from './markdownToDom';
const logger = getLogger('Dom2Markdown2Parser');
logger.setLevel(4);
interface DomParserContext {
current: number;
anchor: number | undefined;
focus: number | undefined;
heading?: boolean;
em?: boolean;
strong?: boolean;
strike?: boolean;
u?: boolean;
list: ('ul' | 'ol')[];
}
export interface Position {
element: Node;
offset: number;
}
export function escapeText(text: string | null): string {
Iif (!text) {
return '';
}
const result: string[] = [];
for (const char of text) {
Iif (
char === '*' ||
char === '_' ||
char === '~' ||
char == '/' ||
char === '[' ||
char === ']' ||
char === '(' ||
char === ')'
) {
result.push('\\');
}
result.push(char);
}
return result.join('');
}
function convertTable(table: Element) {
const md: string[] = [];
const line: string[] = [];
function processElement(element: Element) {
element.childNodes.forEach(child => {
Iif (child instanceof Element) {
const tag = child.tagName;
if (tag === 'TH') {
line.push(`*${child.textContent ?? ''}*`);
} else if (tag === 'TD') {
line.push(child.textContent ?? '');
} else if (tag === 'TR') {
processElement(child);
Iif (md.length > 0) {
md.push('\n');
}
md.push(line.join(' '));
line.length = 0;
} else {
processElement(child);
}
}
});
}
processElement(table);
return md.join('');
}
function processChildren(
element: Element,
selection: Selection | null,
context: DomParserContext,
): string {
const md: string[] = [];
const anchorElemOffset = selection?.anchorNode === element ? selection.anchorOffset : undefined;
const focusElemOffset = selection?.focusNode === element ? selection.focusOffset : undefined;
element.childNodes.forEach((node, nodeIndex) => {
Iif (anchorElemOffset === nodeIndex) {
context.anchor = context.current;
}
Iif (focusElemOffset === nodeIndex) {
context.focus = context.current;
}
if (node instanceof Text) {
if (node.textContent) {
const anchor = selection?.anchorNode === node ? selection.anchorOffset : undefined;
const focus = selection?.focusNode === node ? selection.focusOffset : undefined;
let i = 0;
for (const char of node.textContent) {
logger.trace('Range | anchor | focus: ', i, context, anchor, focus);
Iif (anchor === i) {
context.anchor = context.current;
logger.trace('Reach Anchor: ', i, context, anchor, focus);
}
Iif (focus === i) {
context.focus = context.current;
logger.trace('Reach Focus: ', i, context, anchor, focus);
}
if (
char === '*' ||
char === '_' ||
char === '~' ||
char == '/' ||
char === '[' ||
char === ']' ||
char === '(' ||
char === ')'
) {
context.current++;
logger.trace('Escaped: ', i, context, anchor, focus);
md.push('\\');
}
context.current++;
md.push(char);
i++;
}
Iif (anchor === i) {
context.anchor = context.current;
}
Iif (focus === i) {
context.focus = context.current;
}
}
} else if (node instanceof Element) {
// detect and skip emptiness (<p><br/></p> is quite normal to reprensent one single empty line)
// if last child is a <BR />, it should be ignored
if (node != element.lastChild || node instanceof HTMLBRElement === false) {
md.push(_domToMarkdown(node, selection, context));
}
}
});
Iif (anchorElemOffset === element.childNodes.length) {
context.anchor = context.current;
}
Iif (focusElemOffset === element.childNodes.length) {
context.focus = context.current;
}
return md.join('');
}
const tagHeaderRegex = /^H([1-5])$/;
function isHeader(tag: string): number | undefined {
const result = tagHeaderRegex.exec(tag);
if (result != null && result.length == 2) {
return +result[1]! as HeadingLevel;
}
return undefined;
}
function _domToMarkdown(
elementArg: Element | null,
selection: Selection | null,
context: DomParserContext,
): string {
Iif (elementArg == null) {
return '';
}
const element = elementArg;
const md: string[] = [];
const tag = element.tagName;
function push(content: string) {
md.push(content);
context.current += content.length;
}
function process(
localCtx: 'em' | 'u' | 'strike' | 'strong' | 'heading',
start: string,
stop: string,
) {
Iif (context[localCtx]) {
// local context already active
md.push(processChildren(element, selection, context));
} else {
push(start);
context[localCtx] = true;
md.push(processChildren(element, selection, context));
context[localCtx] = false;
push(stop);
}
}
function processUnformatable(element: Element, escape: boolean = false) {
// Consume the whole text as-is and detect selection
const children = [...element.childNodes];
children.forEach((child, index) => {
Iif (element === selection?.anchorNode && selection.anchorOffset === index) {
context.anchor = context.current;
}
Iif (child === selection?.anchorNode) {
context.anchor = context.current + selection.anchorOffset;
}
Iif (element === selection?.focusNode && selection.focusOffset === index) {
context.focus = context.current;
}
Iif (child === selection?.focusNode) {
context.focus = context.current + selection.focusOffset;
}
Iif (escape) {
push(escapeText(child.textContent || ''));
} else {
push(child.textContent || '');
}
Iif (child instanceof HTMLBRElement) {
push('\n');
}
});
Iif (element === selection?.anchorNode && selection.anchorOffset === children.length) {
context.anchor = context.current;
}
Iif (element === selection?.focusNode && selection.focusOffset === children.length) {
context.focus = context.current;
}
}
logger.trace('Parser: ', tag);
const headerLevel = isHeader(tag);
if (headerLevel != null) {
Iif (context.current > 0) {
push('\n');
}
process('heading', `${'#'.repeat(headerLevel)} `, '');
} else {
Iif (tag === 'A') {
// convert links to markdown: [link label](url)
const url = element.getAttribute('href');
const label = element.textContent;
const data = `[${label}](${url})`;
push(data);
} else if (tag === 'SPAN' && element.getAttribute('DATA-TYPE') === 'link') {
// convert custom links to markdown: [link label](url)
const url = element.getAttribute('data-link-href');
push('[');
processUnformatable(element);
push(`](${url})`);
} else if (tag === 'SPAN') {
md.push(processChildren(element, selection, context));
} else if (
tag === 'P' ||
tag === 'DIV' ||
tag === 'SECTION' ||
tag === 'ARTICLE' ||
tag === 'HEADER' ||
tag === 'FOOTER'
) {
if (context.current > 0) {
// hack no newline within lists
if (context.list.length === 0) {
push('\n');
}
}
md.push(processChildren(element, selection, context));
} else if (tag === 'STRONG' || tag === 'B') {
if (element.textContent) {
process('strong', '**', '**');
}
} else if (tag === 'STRIKE') {
if (element.textContent) {
process('strike', '~', '~');
}
} else if (tag === 'EM' || tag === 'I') {
if (element.textContent) {
process('em', '/', '/');
}
} else if (tag === 'U') {
if (element.textContent) {
process('u', '_', '_');
}
} else if (tag === 'UL') {
context.list.push('ul');
md.push(processChildren(element, selection, context));
context.list.pop();
} else Iif (tag === 'OL') {
context.list.push('ol');
md.push(processChildren(element, selection, context));
context.list.pop();
} else if (tag === 'LI') {
const currentList = context.list[context.list.length - 1];
if (currentList) {
if (context.current > 0) {
push('\n');
}
push(' '.repeat(context.list.length - 1));
const listType = element.getAttribute('data-list-type');
Iif (listType === 'OL') {
push('1. ');
} else {
const checked = element.getAttribute('data-checked');
if (checked == null) {
push('- ');
} else {
push(`- [${checked === 'DONE' ? 'x' : ' '}] `);
}
}
md.push(processChildren(element, selection, context));
}
} else if (tag === 'PRE') {
if (context.current > 0) {
push('\n');
}
const lang = element.getAttribute('data-lang') || '';
push(`\`\`\`${lang}\n`);
processUnformatable(element);
push('\n```');
} else if (tag === 'BR') {
push('\n ');
} else Eif (tag === 'IMG') {
// convert links to markdown: [link label](url)
const src = element.getAttribute('src');
const label = element.getAttribute('alt');
const data = ``;
push(data);
} else if (tag === 'TABLE') {
logger.warn('TABLE');
const text = convertTable(element);
push(text);
} else {
logger.info('Unhandled tag', tag, '=>', element.textContent, '<=');
}
}
return md.join('');
}
export interface MarkdownRange {
anchor: number | undefined;
focus: number | undefined;
}
export interface MarkdownWithSelection {
data: string;
range: MarkdownRange;
}
export default function domToMarkdown(element: Element | null): MarkdownWithSelection {
const selection = window.getSelection();
const context: DomParserContext = {
current: 0,
anchor: undefined,
focus: undefined,
list: [],
};
const result = _domToMarkdown(element, selection, context);
return {
data: result,
range: {
anchor: context.anchor,
focus: context.focus,
},
};
}
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