1
0
mirror of https://github.com/laurent22/joplin.git synced 2024-12-03 08:35:29 +02:00
joplin/packages/lib/import-enex-md-gen.ts

1426 lines
41 KiB
TypeScript

import markdownUtils from './markdownUtils';
import { ResourceEntity } from './services/database/types';
const stringPadding = require('string-padding');
const stringToStream = require('string-to-stream');
const resourceUtils = require('./resourceUtils.js');
const cssParser = require('css');
const BLOCK_OPEN = '[[BLOCK_OPEN]]';
const BLOCK_CLOSE = '[[BLOCK_CLOSE]]';
const NEWLINE = '[[NEWLINE]]';
const NEWLINE_MERGED = '[[MERGED]]';
const SPACE = '[[SPACE]]';
enum SectionType {
Text = 'text',
Tr = 'tr',
Td = 'td',
Table = 'table',
Caption = 'caption',
Hidden = 'hidden',
Code = 'code',
}
interface Section {
type: SectionType;
parent: Section;
lines: any[];
isHeader?: boolean;
}
interface ParserStateTag {
name: string;
visible: boolean;
isCodeBlock: boolean;
isHighlight: boolean;
}
enum ListTag {
Ul = 'ul',
Ol = 'ol',
CheckboxList = 'checkboxList',
TaskList = 'taskList',
}
interface ParserStateList {
tag: ListTag;
counter: number;
startedText: boolean;
}
interface ParserState {
inCode: boolean[];
inPre: boolean;
inQuote: boolean;
lists: ParserStateList[];
anchorAttributes: any[];
spanAttributes: string[];
tags: ParserStateTag[];
currentCode?: string;
}
interface ExtractedTask {
title: string;
completed: boolean;
groupId: string;
}
interface EnexXmlToMdArrayResult {
content: Section;
resources: ResourceEntity[];
}
function processMdArrayNewLines(md: string[]): string {
while (md.length && md[0] === BLOCK_OPEN) {
md.shift();
}
while (md.length && md[md.length - 1] === BLOCK_CLOSE) {
md.pop();
}
let temp = [];
let last = '';
for (let i = 0; i < md.length; i++) {
const v = md[i];
if (isNewLineBlock(last) && isNewLineBlock(v) && last === v) {
// Skip it
} else {
temp.push(v);
}
last = v;
}
md = temp;
temp = [];
last = '';
for (let i = 0; i < md.length; i++) {
const v = md[i];
if (last === BLOCK_CLOSE && v === BLOCK_OPEN) {
temp.pop();
temp.push(NEWLINE_MERGED);
} else {
temp.push(v);
}
last = v;
}
md = temp;
temp = [];
last = '';
for (let i = 0; i < md.length; i++) {
const v = md[i];
if (last === NEWLINE && (v === NEWLINE_MERGED || v === BLOCK_CLOSE)) {
// Skip it
} else {
temp.push(v);
}
last = v;
}
md = temp;
// NEW!!!
temp = [];
last = '';
for (let i = 0; i < md.length; i++) {
const v = md[i];
if (last === NEWLINE && (v === NEWLINE_MERGED || v === BLOCK_OPEN)) {
// Skip it
} else {
temp.push(v);
}
last = v;
}
md = temp;
if (md.length > 2) {
if (md[md.length - 2] === NEWLINE_MERGED && md[md.length - 1] === NEWLINE) {
md.pop();
}
}
let output = '';
let previous = '';
let start = true;
for (let i = 0; i < md.length; i++) {
const v = md[i];
let add = '';
if (v === BLOCK_CLOSE || v === BLOCK_OPEN || v === NEWLINE || v === NEWLINE_MERGED) {
add = '\n';
} else if (v === SPACE) {
if (previous === SPACE || previous === '\n' || start) {
continue; // skip
} else {
add = ' ';
}
} else {
add = v;
}
start = false;
output += add;
previous = add;
}
if (!output.trim().length) return '';
// To simplify the result, we only allow up to one empty line between blocks of text
const mergeMultipleNewLines = function(lines: string[]) {
const output = [];
let newlineCount = 0;
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
if (!line.trim()) {
newlineCount++;
} else {
newlineCount = 0;
}
if (newlineCount >= 2) continue;
output.push(line);
}
return output;
};
let lines = output.replace(/\\r/g, '').split('\n');
lines = formatMdLayout(lines);
lines = mergeMultipleNewLines(lines);
return lines.join('\n');
}
// While the processMdArrayNewLines() function adds newlines in a way that's technically correct, the resulting Markdown can look messy.
// This is because while a "block" element should be surrounded by newlines, in practice, some should be surrounded by TWO new lines, while
// others by only ONE.
//
// For instance, this:
//
// <li>one</li>
// <li>two</li>
// <li>three</li>
//
// should result in this:
//
// - one
// - two
// - three
//
// While this:
//
// <p>Some long paragraph</p><p>And another one</p><p>And the last paragraph</p>
//
// should result in this:
//
// Some long paragraph
//
// And another one
//
// And the last paragraph
//
// So in one case, one newline between tags, and in another two newlines. In HTML this would be done via CSS, but in Markdown we need
// to add new lines. It's also important to get these newlines right because two blocks of text next to each others might be renderered
// differently than if there's a newlines between them. So the function below parses the almost final MD and add new lines depending
// on various rules.
const isHeading = function(line: string) {
return !!line.match(/^#+\s/);
};
const isListItem = function(line: string) {
return line && line.trim().indexOf('- ') === 0;
};
const isCodeLine = function(line: string) {
return line && line.indexOf('\t') === 0;
};
const isTableLine = function(line: string) {
return line.indexOf('| ') === 0;
};
const isPlainParagraph = function(line: string) {
// Note: if a line is no longer than 80 characters, we don't consider it's a paragraph, which
// means no newlines will be added before or after. This is to handle text that has been
// written with "hard" new lines.
if (!line || line.length < 80) return false;
if (isListItem(line)) return false;
if (isHeading(line)) return false;
if (isCodeLine(line)) return false;
if (isTableLine(line)) return false;
return true;
};
function formatMdLayout(lines: string[]) {
let previous = '';
const newLines = [];
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
// Add a new line at the end of a list of items
if (isListItem(previous) && line && !isListItem(line)) {
newLines.push('');
// Add a new line at the beginning of a list of items
} else if (isListItem(line) && previous && !isListItem(previous)) {
newLines.push('');
// Add a new line before a heading
} else if (isHeading(line) && previous) {
newLines.push('');
// Add a new line after a heading
} else if (isHeading(previous) && line) {
newLines.push('');
} else if (isCodeLine(line) && !isCodeLine(previous)) {
newLines.push('');
} else if (!isCodeLine(line) && isCodeLine(previous)) {
newLines.push('');
} else if (isTableLine(line) && !isTableLine(previous)) {
newLines.push('');
} else if (!isTableLine(line) && isTableLine(previous)) {
newLines.push('');
// Add a new line at beginning of paragraph
} else if (isPlainParagraph(line) && previous) {
newLines.push('');
// Add a new line at end of paragraph
} else if (isPlainParagraph(previous) && line) {
newLines.push('');
}
newLines.push(line);
previous = newLines[newLines.length - 1];
}
return newLines;
}
function isWhiteSpace(c: string): boolean {
return c === '\n' || c === '\r' || c === '\v' || c === '\f' || c === '\t' || c === ' ';
}
// Like QString::simpified(), except that it preserves non-breaking spaces (which
// Evernote uses for identation, etc.)
function simplifyString(s: string): string {
let output = '';
let previousWhite = false;
for (let i = 0; i < s.length; i++) {
const c = s[i];
const isWhite = isWhiteSpace(c);
if (previousWhite && isWhite) {
// skip
} else {
output += c;
}
previousWhite = isWhite;
}
while (output.length && isWhiteSpace(output[0])) output = output.substr(1);
while (output.length && isWhiteSpace(output[output.length - 1])) output = output.substr(0, output.length - 1);
return output;
}
function collapseWhiteSpaceAndAppend(lines: string[], state: any, text: string) {
if (state.inCode.length) {
lines.push(text);
} else {
// Remove all \n and \r from the left and right of the text
while (text.length && (text[0] === '\n' || text[0] === '\r')) text = text.substr(1);
while (text.length && (text[text.length - 1] === '\n' || text[text.length - 1] === '\r')) text = text.substr(0, text.length - 1);
// Collapse all white spaces to just one. If there are spaces to the left and right of the string
// also collapse them to just one space.
const spaceLeft = text.length && text[0] === ' ';
const spaceRight = text.length && text[text.length - 1] === ' ';
text = simplifyString(text);
if (!spaceLeft && !spaceRight && text === '') return lines;
if (state.inQuote) {
// Add a ">" at the beginning of the block then at the beginning of each lines. So it turns this:
// "my quote\nsecond line" into this => "> my quote\n> second line"
lines.push('> ');
if (lines.indexOf('\r') >= 0) {
text = text.replace(/\n\r/g, '\n\r> ');
} else {
text = text.replace(/\n/g, '\n> ');
}
}
if (spaceLeft) lines.push(SPACE);
lines.push(text);
if (spaceRight) lines.push(SPACE);
}
return lines;
}
function tagAttributeToMdText(attr: string): string {
// HTML attributes may contain newlines so remove them.
// https://github.com/laurent22/joplin/issues/1583
if (!attr) return '';
attr = attr.replace(/[\n\r]+/g, ' ');
attr = attr.replace(/\]/g, '\\]');
return attr;
}
function addResourceTag(lines: string[], resource: ResourceEntity, alt = ''): string[] {
// Note: refactor to use Resource.markdownTag
if (!alt) alt = resource.title;
if (!alt) alt = resource.filename;
if (!alt) alt = '';
alt = tagAttributeToMdText(alt);
if (resourceUtils.isImageMimeType(resource.mime)) {
lines.push('![');
lines.push(alt);
lines.push(`](:/${resource.id})`);
} else {
lines.push('[');
lines.push(alt);
lines.push(`](:/${resource.id})`);
}
return lines;
}
function isBlockTag(n: string) {
return ['div', 'p', 'dl', 'dd', 'dt', 'center', 'address'].indexOf(n) >= 0;
}
function isStrongTag(n: string) {
return n === 'strong' || n === 'b' || n === 'big';
}
function isStrikeTag(n: string) {
return n === 'strike' || n === 's' || n === 'del';
}
function isEmTag(n: string) {
return n === 'em' || n === 'i' || n === 'u';
}
function isAnchor(n: string) {
return n === 'a';
}
function isIgnoredEndTag(n: string) {
return ['en-note', 'en-todo', 'body', 'html', 'font', 'br', 'hr', 'tbody', 'sup', 'img', 'abbr', 'cite', 'thead', 'small', 'tt', 'sub', 'colgroup', 'col', 'ins', 'caption', 'var', 'map', 'area'].indexOf(n) >= 0;
}
function isListTag(n: string) {
return n === 'ol' || n === 'ul';
}
// Elements that don't require any special treatment beside adding a newline character
function isNewLineOnlyEndTag(n: string) {
return ['div', 'p', 'li', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'dl', 'dd', 'dt', 'center', 'address'].indexOf(n) >= 0;
}
function isInlineCodeTag(n: string) {
return ['samp', 'kbd'].indexOf(n) >= 0;
}
function isNewLineBlock(s: string) {
return s === BLOCK_OPEN || s === BLOCK_CLOSE;
}
function attributeToLowerCase(node: any) {
if (!node.attributes) return {};
const output: any = {};
for (const n in node.attributes) {
if (!node.attributes.hasOwnProperty(n)) continue;
output[n.toLowerCase()] = node.attributes[n];
}
return output;
}
function cssValue(context: any, style: string, propName: string | string[]): string {
if (!style) return null;
const propNames = Array.isArray(propName) ? propName : [propName];
try {
const o = cssParser.parse(`pre {${style}}`);
if (!o.stylesheet.rules.length) return null;
for (const propName of propNames) {
const prop = o.stylesheet.rules[0].declarations.find((d: any) => d.property.toLowerCase() === propName);
if (prop && prop.value) return prop.value.trim().toLowerCase();
}
return null;
} catch (error) {
displaySaxWarning(context, error.message);
return null;
}
}
function isInvisibleBlock(context: any, attributes: any) {
const display = cssValue(context, attributes.style, 'display');
return display && display.indexOf('none') === 0;
}
function trimBlockOpenAndClose(lines: string[]): string[] {
const output = lines.slice();
while (output.length && [BLOCK_OPEN, BLOCK_CLOSE, ''].includes(output[0])) {
output.splice(0, 1);
}
while (output.length && [BLOCK_OPEN, BLOCK_CLOSE, ''].includes(output[output.length - 1])) {
output.pop();
}
return output;
}
function isSpanWithStyle(attributes: any) {
if (attributes) {
if ('style' in attributes) {
return true;
} else {
return false;
}
}
return false;
}
function isSpanStyleBold(attributes: any) {
let style = attributes.style;
if (!style) return false;
style = style.replace(/\s+/g, '');
if (style.includes('font-weight:bold') || style.includes('font-weight:700') || style.includes('font-weight:800') || style.includes('font-weight:900')) {
return true;
} else if (style.search(/font-family:.*,Bold.*;/) !== -1) {
return true;
} else {
return false;
}
}
function isSpanStyleItalic(attributes: any) {
let style = attributes.style;
style = style.replace(/\s+/g, '');
return (style.toLowerCase().includes('font-style:italic'));
}
function displaySaxWarning(context: any, message: string) {
const line = [];
const parser = context ? context._parser : null;
if (parser) {
line.push(`Line ${parser.line}:${parser.column}`);
}
line.push(message);
console.warn(line.join(': '));
}
function isCodeBlock(context: any, nodeName: string, attributes: any) {
if (nodeName === 'code') return true;
if (attributes && attributes.style) {
// Yes, this property sometimes appears as -en-codeblock, sometimes as
// --en-codeblock. Would be too easy to import ENEX data otherwise.
// https://github.com/laurent22/joplin/issues/4965
const enCodeBlock = cssValue(context, attributes.style, [
'-en-codeblock',
'--en-codeblock',
'-evernote-codeblock',
'--evernote-codeblock',
]);
if (enCodeBlock && enCodeBlock.toLowerCase() === 'true') return true;
}
return false;
}
function isHighlight(context: any, _nodeName: string, attributes: any) {
if (attributes && attributes.style) {
// Evernote uses various inconsistent CSS prefixes: so far I've found
// "--en", "-en", "-evernote", so I'm guessing "--evernote" probably
// exists too.
const enHighlight = cssValue(context, attributes.style, [
'-evernote-highlight',
'--evernote-highlight',
'-en-highlight',
'--en-highlight',
]);
// Value can be any colour or "true". I guess if it's set at all it
// should be highlighted but just in case handle case where it's
// "false".
if (enHighlight && enHighlight.toLowerCase() !== 'false') return true;
}
return false;
}
function enexXmlToMdArray(stream: any, resources: ResourceEntity[], tasks: ExtractedTask[]): Promise<EnexXmlToMdArrayResult> {
const remainingResources = resources.slice();
const removeRemainingResource = (id: string) => {
for (let i = 0; i < remainingResources.length; i++) {
const r = remainingResources[i];
if (r.id === id) {
remainingResources.splice(i, 1);
}
}
};
return new Promise((resolve) => {
const state: ParserState = {
inCode: [],
inPre: false,
inQuote: false,
lists: [],
anchorAttributes: [],
spanAttributes: [],
tags: [],
};
const options = {};
const strict = false;
const saxStream = require('@joplin/fork-sax').createStream(strict, options);
let section: Section = {
type: SectionType.Text,
lines: [],
parent: null,
};
saxStream.on('error', (e: any) => {
console.warn(e);
});
const unwrapInnerText = (text: string) => {
const lines = text.split('\n');
let output = '';
for (let i = 0; i < lines.length; i++) {
const line = lines[i];
const nextLine = i < lines.length - 1 ? lines[i + 1] : '';
if (!line) {
output += '\n';
continue;
}
if (nextLine) {
output += `${line} `;
} else {
output += line;
}
}
return output;
};
saxStream.on('text', (text: string) => {
if (['table', 'tr', 'tbody'].indexOf(section.type) >= 0) return;
const currentList = state.lists && state.lists.length ? state.lists[state.lists.length - 1] : null;
if ((currentList) && (currentList.tag === ListTag.TaskList)) {
// skip text on task lists
return;
}
text = !state.inPre ? unwrapInnerText(text) : text;
section.lines = collapseWhiteSpaceAndAppend(section.lines, state, text);
});
saxStream.on('opentag', function(node: any) {
const nodeAttributes = attributeToLowerCase(node);
const n = node.name.toLowerCase();
const isVisible = !isInvisibleBlock(this, nodeAttributes);
const tagInfo: ParserStateTag = {
name: n,
visible: isVisible,
isCodeBlock: isCodeBlock(this, n, nodeAttributes),
isHighlight: isHighlight(this, n, nodeAttributes),
};
state.tags.push(tagInfo);
const currentList = state.lists && state.lists.length ? state.lists[state.lists.length - 1] : null;
// Kind of a hack: If we are inside a list, at the beginning of an item (when a "- " or "1. " has been added
// but no other text yet), if the current tag is eg. a <div> or any other block tag, we skip it, so that a new line
// does not get created. It is to handle list4.html test case.
// https://github.com/laurent22/joplin/issues/832
if (currentList) {
if (!currentList.startedText && isBlockTag(n)) return;
currentList.startedText = true;
}
// Note that the order of if/else blocks is important. In
// particular table-related blocks should always be on top and
// take priority over, in particular, hidden blocks. This is so
// that a block that is both table-related and hidden is simply
// handled as table-related. This is to ensure that the table
// structure is valid.
if (n === 'en-note') {
// Start of note
} else if (n === 'table') {
const newSection: Section = {
type: SectionType.Table,
lines: [],
parent: section,
};
section.lines.push(newSection);
section = newSection;
} else if (n === 'tbody' || n === 'thead') {
// Ignore it
} else if (n === 'tr') {
// Note: Even if we encounter tags in the wrong place, we
// create the sections anyway so that the data is imported.
// Invalid HTML like would most likely be from clipped
// pages which would look like a mess in Evernote. So it
// will look like a mess in Joplin too but at least the
// data will be there.
//
// Also if we simply skip the section, it will cause an
// error in drawTable() later on.
//
// https://discourse.joplinapp.org/t/not-all-notes-imported-from-evernote/13056/12?u=laurent
if (section.type !== 'table') {
displaySaxWarning(this, 'Found a <tr> tag outside of a table');
// return;
}
const newSection: Section = {
type: SectionType.Tr,
lines: [],
parent: section,
isHeader: false,
};
section.lines.push(newSection);
section = newSection;
} else if (n === 'td' || n === 'th') {
if (section.type !== 'tr') {
displaySaxWarning(this, 'Found a <td> tag outside of a <tr>');
// return;
}
if (n === 'th') section.isHeader = true;
const newSection: Section = {
type: SectionType.Td,
lines: [],
parent: section,
};
section.lines.push(newSection);
section = newSection;
} else if (n === 'caption') {
if (section.type !== 'table') {
displaySaxWarning(this, 'Found a <caption> tag outside of a <table>');
}
const newSection: Section = {
type: SectionType.Caption,
lines: [],
parent: section,
};
section.lines.push(newSection);
section = newSection;
} else if (!isVisible) {
const newSection: Section = {
type: SectionType.Hidden,
lines: [],
parent: section,
};
section.lines.push(newSection);
section = newSection;
} else if (tagInfo.isCodeBlock) {
state.inCode.push(true);
state.currentCode = '';
const newSection: Section = {
type: SectionType.Code,
lines: [],
parent: section,
};
section.lines.push(newSection);
section = newSection;
} else if (isBlockTag(n)) {
const isTodosList = cssValue(this, nodeAttributes.style, '--en-task-group') === 'true';
if (isTodosList) {
const todoGroup = cssValue(this, nodeAttributes.style, '--en-id');
section.lines.push(BLOCK_OPEN);
for (const t of tasks) {
if (t.groupId === todoGroup) {
section.lines.push(`- [${t.completed ? 'x' : ' '}] ${t.title}\n`);
}
}
tagInfo.name = ListTag.TaskList;
state.lists.push({ tag: ListTag.TaskList, counter: 1, startedText: false });
} else {
section.lines.push(BLOCK_OPEN);
}
} else if (isListTag(n)) {
section.lines.push(BLOCK_OPEN);
const isCheckboxList = cssValue(this, nodeAttributes.style, '--en-todo') === 'true';
const tag = isCheckboxList ? ListTag.CheckboxList : n as ListTag;
state.lists.push({ tag: tag, counter: 1, startedText: false });
} else if (n === 'li') {
section.lines.push(BLOCK_OPEN);
if (!state.lists.length) {
displaySaxWarning(this, 'Found <li> tag without being inside a list');
return;
}
const container = state.lists[state.lists.length - 1];
container.startedText = false;
const indent = ' '.repeat(state.lists.length - 1);
if (container.tag === ListTag.CheckboxList) {
const x = cssValue(this, nodeAttributes.style, '--en-checked') === 'true' ? 'X' : ' ';
section.lines.push(`${indent}- [${x}] `);
} else if (container.tag === ListTag.Ul) {
section.lines.push(`${indent}- `);
} else {
section.lines.push(`${indent + container.counter}. `);
container.counter++;
}
} else if (tagInfo.isHighlight) {
section.lines.push('==');
} else if (isStrongTag(n)) {
section.lines.push('**');
} else if (isStrikeTag(n)) {
section.lines.push('<s>');
} else if (isInlineCodeTag(n)) {
section.lines.push('`');
} else if (n === 'q') {
section.lines.push('"');
} else if (n === 'img') {
if (nodeAttributes.src) {
// Many (most?) img tags don't have no source associated, especially when they were imported from HTML
let s = '![';
if (nodeAttributes.alt) s += tagAttributeToMdText(nodeAttributes.alt);
s += `](${markdownUtils.escapeLinkUrl(nodeAttributes.src)})`;
section.lines.push(s);
}
} else if (isAnchor(n)) {
state.anchorAttributes.push(nodeAttributes);
// Need to add the '[' via this function to make sure that links within code blocks
// are handled correctly.
collapseWhiteSpaceAndAppend(section.lines, state, '[');
} else if (isEmTag(n)) {
section.lines.push('*');
} else if (n === 'en-todo') {
const x = nodeAttributes.checked && nodeAttributes.checked.toLowerCase() === 'true' ? 'X' : ' ';
section.lines.push(`- [${x}] `);
} else if (n === 'hr') {
// Needs to be surrounded by new lines so that it's properly rendered as a line when converting to HTML
section.lines.push(NEWLINE);
section.lines.push('* * *');
section.lines.push(NEWLINE);
section.lines.push(NEWLINE);
} else if (n === 'h1') {
section.lines.push(BLOCK_OPEN);
section.lines.push('# ');
} else if (n === 'h2') {
section.lines.push(BLOCK_OPEN);
section.lines.push('## ');
} else if (n === 'h3') {
section.lines.push(BLOCK_OPEN);
section.lines.push('### ');
} else if (n === 'h4') {
section.lines.push(BLOCK_OPEN);
section.lines.push('#### ');
} else if (n === 'h5') {
section.lines.push(BLOCK_OPEN);
section.lines.push('##### ');
} else if (n === 'h6') {
section.lines.push(BLOCK_OPEN);
section.lines.push('###### ');
} else if (n === 'blockquote') {
section.lines.push(BLOCK_OPEN);
state.inQuote = true;
} else if (n === 'pre') {
section.lines.push(BLOCK_OPEN);
state.inPre = true;
} else if (n === 'br') {
section.lines.push(NEWLINE);
} else if (n === 'en-media') {
const hash = nodeAttributes.hash;
let resource = null;
for (let i = 0; i < resources.length; i++) {
const r = resources[i];
if (r.id === hash) {
resource = r;
removeRemainingResource(r.id);
break;
}
}
if (!resource) {
// This is a bit of a hack. Notes sometime have resources attached to it, but those <resource> tags don't contain
// an "objID" tag, making it impossible to reference the resource. However, in this case the content of the note
// will contain a corresponding <en-media/> tag, which has the ID in the "hash" attribute. All this information
// has been collected above so we now set the resource ID to the hash attribute of the en-media tags. Here's an
// example of note that shows this problem:
// <?xml version="1.0" encoding="UTF-8"?>
// <!DOCTYPE en-export SYSTEM "http://xml.evernote.com/pub/evernote-export2.dtd">
// <en-export export-date="20161221T203133Z" application="Evernote/Windows" version="6.x">
// <note>
// <title>Commande</title>
// <content>
// <![CDATA[
// <?xml version="1.0" encoding="UTF-8"?>
// <!DOCTYPE en-note SYSTEM "http://xml.evernote.com/pub/enml2.dtd">
// <en-note>
// <en-media alt="your QR code" hash="216a16a1bbe007fba4ccf60b118b4ccc" type="image/png"></en-media>
// </en-note>
// ]]>
// </content>
// <created>20160921T203424Z</created>
// <updated>20160921T203438Z</updated>
// <note-attributes>
// <reminder-order>20160902T140445Z</reminder-order>
// <reminder-done-time>20160924T101120Z</reminder-done-time>
// </note-attributes>
// <resource>
// <data encoding="base64">........</data>
// <mime>image/png</mime>
// <width>150</width>
// <height>150</height>
// </resource>
// </note>
// </en-export>
// Note that there's also the case of resources with no ID where the ID is actually the MD5 of the content.
// This is handled in import-enex.js
let found = false;
for (let i = 0; i < remainingResources.length; i++) {
const r = remainingResources[i];
if (!r.id) {
resource = { ...r };
resource.id = hash;
remainingResources.splice(i, 1);
found = true;
break;
}
}
if (!found) {
// console.warn(`Hash with no associated resource: ${hash}`);
}
}
// If the resource does not appear among the note's resources, it
// means it's an attachement. It will be appended along with the
// other remaining resources at the bottom of the markdown text.
if (resource && !!resource.id) {
section.lines = addResourceTag(section.lines, resource, nodeAttributes.alt);
}
} else if (n === 'span') {
if (isSpanWithStyle(nodeAttributes)) {
// Found style(s) in span tag
state.spanAttributes.push(nodeAttributes);
if (isSpanStyleBold(nodeAttributes)) {
// Applying style found in span tag: bold'
section.lines.push('**');
}
if (isSpanStyleItalic(nodeAttributes)) {
// Applying style found in span tag: italic'
section.lines.push('*');
}
}
} else if (['font', 'sup', 'cite', 'abbr', 'small', 'tt', 'sub', 'colgroup', 'col', 'ins', 'caption', 'var', 'map', 'area'].indexOf(n) >= 0) {
// Inline tags that can be ignored in Markdown
} else {
console.warn(`Unsupported start tag: ${n}`);
}
});
saxStream.on('closetag', (n: string) => {
n = n ? n.toLowerCase() : n;
const poppedTag = state.tags.pop();
if (n === 'en-note') {
// End of note
} else if (!poppedTag.visible) {
if (section && section.parent) section = section.parent;
} else if (poppedTag.isHighlight) {
section.lines.push('==');
} else if (poppedTag.isCodeBlock) {
state.inCode.pop();
if (!state.inCode.length) {
// When a codeblock is wrapped in <pre><code>, it will have
// extra empty lines added by the "pre" logic, but since we
// are in a codeblock we should actually trim those.
const codeLines = trimBlockOpenAndClose(processMdArrayNewLines(section.lines).split('\n'));
section.lines = [];
if (codeLines.length > 1) {
section.lines.push('\n\n```\n');
for (let i = 0; i < codeLines.length; i++) {
if (i > 0) section.lines.push('\n');
section.lines.push(codeLines[i]);
}
section.lines.push('\n```\n\n');
} else {
section.lines.push(`\`${markdownUtils.escapeInlineCode(codeLines.join(''))}\``);
}
if (section && section.parent) section = section.parent;
}
} else if (isNewLineOnlyEndTag(n)) {
if (poppedTag.name === ListTag.TaskList) {
state.lists.pop();
}
section.lines.push(BLOCK_CLOSE);
} else if (n === 'td' || n === 'th') {
if (section && section.parent) section = section.parent;
} else if (n === 'tr' || n === 'caption') {
if (section && section.parent) section = section.parent;
} else if (n === 'table') {
if (section && section.parent) section = section.parent;
} else if (isIgnoredEndTag(n)) {
// Skip
} else if (isListTag(n)) {
section.lines.push(BLOCK_CLOSE);
state.lists.pop();
} else if (isStrongTag(n)) {
section.lines.push('**');
} else if (isStrikeTag(n)) {
section.lines.push('</s>');
} else if (isInlineCodeTag(n)) {
section.lines.push('`');
} else if (isEmTag(n)) {
section.lines.push('*');
} else if (n === 'q') {
section.lines.push('"');
} else if (n === 'blockquote') {
section.lines.push(BLOCK_OPEN);
state.inQuote = false;
} else if (n === 'pre') {
state.inPre = false;
section.lines.push(BLOCK_CLOSE);
} else if (isAnchor(n)) {
const attributes = state.anchorAttributes.pop();
const url = attributes && attributes.href ? attributes.href : '';
if (section.lines.length < 1) throw new Error('Invalid anchor tag closing'); // Sanity check, but normally not possible
// When closing the anchor tag, check if there's is any text content. If not
// put the URL as is (don't wrap it in [](url)). The markdown parser, using
// GitHub flavour, will turn this URL into a link. This is to generate slightly
// cleaner markdown.
// Need to loop on the previous tags so as to skip the special ones, which are not relevant for the below algorithm.
let previous = null;
for (let i = section.lines.length - 1; i >= 0; i--) {
previous = section.lines[i];
if ([BLOCK_OPEN, BLOCK_CLOSE, NEWLINE, NEWLINE_MERGED, SPACE].indexOf(previous) >= 0 || !previous) {
continue;
} else {
break;
}
}
if (previous === '[') {
// We have a link that had some content but, after parsing, nothing is left. The content was most likely
// something that shows up via CSS and which we cannot support. For example:
//
// <a onclick="return vote()" href="vote?id=17045576">
// <div class="votearrow" title="upvote"></div>
// </a>
//
// In the case above the arrow is displayed via CSS.
// It is useless to display the full URL since often it is not relevant for a note (for example
// it's interactive bits) and it's not user-generated content such as a URL that would appear in a comment.
// So in this case, we still want to preserve the information but display it in a discreet way as a simple [L].
// Need to pop everything inside the current [] because it can only be special chars that we don't want (they would create uncessary newlines)
for (let i = section.lines.length - 1; i >= 0; i--) {
if (section.lines[i] !== '[') {
section.lines.pop();
} else {
break;
}
}
if (!url) {
// If there's no URL and no content, pop the [ and don't save any content.
section.lines.pop();
} else {
section.lines.push('(L)');
section.lines.push(`](${url})`);
}
} else if (!previous || previous === url) {
section.lines.pop();
section.lines.pop();
section.lines.push(url);
} else {
// Need to remove any new line character between the current ']' and the previous '['
// otherwise it won't render properly.
let allSpaces = true;
for (let i = section.lines.length - 1; i >= 0; i--) {
const c = section.lines[i];
if (c === '[') {
break;
} else {
if (c === BLOCK_CLOSE || c === BLOCK_OPEN || c === NEWLINE) {
section.lines[i] = SPACE;
} else {
if (!isWhiteSpace(c)) allSpaces = false;
}
}
}
if (allSpaces) {
for (let i = section.lines.length - 1; i >= 0; i--) {
const c = section.lines.pop();
if (c === '[') break;
}
section.lines.push(url);
} else {
// Eg. converts:
// [ Sign in ](https://example.com)
// to:
// [Sign in](https://example.com)
const trimTextStartAndEndSpaces = function(lines: string[]) {
let firstBracketIndex = 0;
let foundFirstNonWhite = false;
for (let i = lines.length - 1; i >= 0; i--) {
const l = lines[i];
if (!foundFirstNonWhite && (l === SPACE || l === ' ' || !l)) {
lines.pop();
} else {
foundFirstNonWhite = true;
}
if (l === '[') {
firstBracketIndex = i;
break;
}
}
for (let i = firstBracketIndex + 1; i < lines.length; i++) {
const l = lines[i];
if (l === SPACE || l === ' ' || !l) {
lines.splice(i, 1);
} else {
break;
}
}
return lines;
};
section.lines = trimTextStartAndEndSpaces(section.lines);
section.lines.push(`](${url})`);
}
}
} else if (n === 'en-media') {
// Skip
} else if (n === 'span') {
const attributes = state.spanAttributes.pop();
if (isSpanWithStyle(attributes)) {
if (isSpanStyleBold(attributes)) {
// Applying style found in span tag (closing): bold'
section.lines.push('**');
}
if (isSpanStyleItalic(attributes)) {
// Applying style found in span tag (closing): italic'
section.lines.push('*');
}
}
} else {
console.warn(`Unsupported end tag: ${n}`);
}
});
saxStream.on('attribute', () => {});
saxStream.on('end', () => {
resolve({
content: section,
resources: remainingResources,
} as EnexXmlToMdArrayResult);
});
stream.pipe(saxStream);
});
}
function tableHasSubTables(table: Section) {
for (let trIndex = 0; trIndex < table.lines.length; trIndex++) {
const tr = table.lines[trIndex];
if (!tr || !tr.lines) continue;
for (let tdIndex = 0; tdIndex < tr.lines.length; tdIndex++) {
const td = tr.lines[tdIndex];
// We are inside a CAPTION, not a TD
if (typeof td === 'string') continue;
for (let i = 0; i < td.lines.length; i++) {
if (typeof td.lines[i] === 'object') return true;
}
}
}
return false;
}
// Markdown tables don't support tables within tables, which is common in notes that are complete web pages, for example when imported
// via Web Clipper. So to handle this, we render all the outer tables as regular text (as if replacing all the <table>, <tr> and <td>
// elements by <div>) and only the inner ones, those that don't contain any other tables, are rendered as actual tables. This is generally
// the required behaviour since the outer tables are usually for layout and the inner ones are the content.
function drawTable(table: Section) {
// | First Header | Second Header |
// | ------------- | ------------- |
// | Content Cell | Content Cell |
// | Content Cell | Content Cell |
// There must be at least 3 dashes separating each header cell.
// https://gist.github.com/IanWang/28965e13cdafdef4e11dc91f578d160d#tables
const flatRender = tableHasSubTables(table); // Render the table has regular text
let lines = [];
lines.push(BLOCK_OPEN);
let headerDone = false;
let caption = null;
for (let trIndex = 0; trIndex < table.lines.length; trIndex++) {
const tr = table.lines[trIndex];
if (tr.type === 'caption') {
caption = tr;
continue;
}
const isHeader = tr.isHeader;
const line = [];
const headerLine = [];
let emptyHeader = null;
for (let tdIndex = 0; tdIndex < tr.lines.length; tdIndex++) {
const td = tr.lines[tdIndex];
if (flatRender) {
line.push(BLOCK_OPEN);
let currentCells: any[] = [];
const renderCurrentCells = () => {
if (!currentCells.length) return;
const cellText = processMdArrayNewLines(currentCells);
line.push(cellText);
currentCells = [];
};
// In here, recursively render the tables
for (let i = 0; i < td.lines.length; i++) {
const c = td.lines[i];
if (typeof c === 'object' && ['table', 'td', 'tr', 'th', 'caption'].indexOf(c.type) >= 0) {
// This is a table
renderCurrentCells();
currentCells = currentCells.concat(drawTable(c));
} else {
// This is plain text
// currentCells.push(c);
currentCells = currentCells.concat(renderLine(c));
}
}
renderCurrentCells();
line.push(BLOCK_CLOSE);
} else {
// Regular table rendering
// A cell in a Markdown table cannot have actual new lines so replace
// them with <br>, which are supported by the markdown renderers.
let cellText = processMdArrayNewLines(td.lines);
let lines = cellText.split('\n');
lines = postProcessMarkdown(lines);
cellText = lines.join('\n').replace(/\n+/g, '<br>');
// Inside tables cells, "|" needs to be escaped
cellText = cellText.replace(/\|/g, '\\|');
// Previously the width of the cell was as big as the content since it looks nicer, however that often doesn't work
// since the content can be very long, resulting in unreadable markdown. So no solution is perfect but making it a
// width of 3 is a bit better. Note that 3 is the minimum width of a cell - below this, it won't be rendered by
// markdown parsers.
const width = 3;
line.push(stringPadding(cellText, width, ' ', stringPadding.RIGHT));
if (!headerDone) {
if (!isHeader) {
if (!emptyHeader) emptyHeader = [];
const h = stringPadding(' ', width, ' ', stringPadding.RIGHT);
emptyHeader.push(h);
}
headerLine.push('-'.repeat(width));
}
}
}
if (flatRender) {
headerDone = true;
lines.push(BLOCK_OPEN);
lines = lines.concat(line);
lines.push(BLOCK_CLOSE);
} else {
if (emptyHeader) {
lines.push(`| ${emptyHeader.join(' | ')} |`);
lines.push(`| ${headerLine.join(' | ')} |`);
headerDone = true;
}
lines.push(`| ${line.join(' | ')} |`);
if (!headerDone) {
lines.push(`| ${headerLine.join(' | ')} |`);
headerDone = true;
}
}
}
lines.push(BLOCK_CLOSE);
if (caption) {
const captionLines: any[] = renderLines(caption.lines);
lines = lines.concat(captionLines);
}
return flatRender ? lines : lines.join(`<<<<:D>>>>${NEWLINE}<<<<:D>>>>`).split('<<<<:D>>>>');
}
function postProcessMarkdown(lines: string[]) {
// After importing HTML, the resulting Markdown often has empty lines at the beginning and end due to
// block start/end or elements that were ignored, etc. If these white spaces were intended it's not really
// possible to detect it, so simply trim them all so that the result is more deterministic and can be
// easily unit tested.
const trimEmptyLines = function(lines: string[]) {
while (lines.length) {
if (!lines[0].trim()) {
lines.splice(0, 1);
} else {
break;
}
}
while (lines.length) {
if (!lines[lines.length - 1].trim()) {
lines.pop();
} else {
break;
}
}
return lines;
};
function cleanUpSpaces(lines: string[]) {
const output = [];
for (let i = 0; i < lines.length; i++) {
let line = lines[i];
if (line.length) {
// eg. " - Some list item" => " - Some list item"
// Note that spaces before the "-" are preserved
line = line.replace(/^(\s+|)-\s+/, '$1- ');
// eg "Some text " => "Some text"
line = line.replace(/^(.*?)\s+$/, '$1');
}
output.push(line);
}
return output;
}
lines = trimEmptyLines(lines);
lines = cleanUpSpaces(lines);
return lines;
}
// A "line" can be some Markdown text, or it can be a section, like a table,
// etc. so this function returns an array of strings.
function renderLine(line: any) {
if (typeof line === 'object' && line.type === 'table') {
// A table
const table = line;
return drawTable(table);
} else if (typeof line === 'object' && line.type === 'code') {
return line.lines;
} else if (typeof line === 'object' && line.type === 'hidden') {
// ENEX notes sometimes have hidden tags. We could strip off these
// sections but in the spirit of preserving all data we wrap them in
// a hidden tag too.
let hiddenLines = ['<div style="display: none;">'];
hiddenLines = hiddenLines.concat(renderLines(line.lines));
hiddenLines.push('</div>');
// We need to add two new lines after the HTML block, or the Markdown
// after that will not render.
// https://github.com/markdown-it/markdown-it/issues/746
hiddenLines.push(NEWLINE);
hiddenLines.push(NEWLINE);
return hiddenLines;
} else if (typeof line === 'object') {
console.warn('Unhandled object type:', line);
return line.lines;
} else {
// an actual line
return [line];
}
}
function renderLines(lines: any[]) {
let mdLines: string[] = [];
for (let i = 0; i < lines.length; i++) {
const renderedLines = renderLine(lines[i]);
mdLines = mdLines.concat(renderedLines);
}
return mdLines;
}
async function enexXmlToMd(xmlString: string, resources: ResourceEntity[], tasks: ExtractedTask[]) {
const stream = stringToStream(xmlString);
const result = await enexXmlToMdArray(stream, resources, tasks);
let mdLines = renderLines(result.content.lines);
let firstAttachment = true;
for (let i = 0; i < result.resources.length; i++) {
const r = result.resources[i];
if (firstAttachment) mdLines.push(NEWLINE);
mdLines.push(NEWLINE);
mdLines = addResourceTag(mdLines, r, r.filename);
firstAttachment = false;
}
let output = processMdArrayNewLines(mdLines).split('\n');
output = postProcessMarkdown(output);
return output.join('\n');
}
export { enexXmlToMd, processMdArrayNewLines, NEWLINE, addResourceTag, cssValue };