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ExpensiMark.js
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ExpensiMark.js
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import * as _ from 'underscore';
import Str from './str';
import * as Constants from './CONST';
import * as UrlPatterns from './Url';
const MARKDOWN_LINK_REGEX = new RegExp(`\\[([^\\][]*(?:\\[[^\\][]*][^\\][]*)*)]\\(${UrlPatterns.MARKDOWN_URL_REGEX}\\)(?![^<]*(<\\/pre>|<\\/code>))`, 'gi');
const MARKDOWN_IMAGE_REGEX = new RegExp(`\\!(?:\\[([^\\][]*(?:\\[[^\\][]*][^\\][]*)*)])?\\(${UrlPatterns.MARKDOWN_URL_REGEX}\\)(?![^<]*(<\\/pre>|<\\/code>))`, 'gi');
const SLACK_SPAN_NEW_LINE_TAG = '<span class="c-mrkdwn__br" data-stringify-type="paragraph-break" style="box-sizing: inherit; display: block; height: unset;"></span>';
export default class ExpensiMark {
constructor() {
/**
* The list of regex replacements to do on a comment. Check the link regex is first so links are processed
* before other delimiters
*
* @type {Object[]}
*/
this.rules = [
// Apply the emoji first avoid applying any other formatting rules inside of it
{
name: 'emoji',
regex: Constants.CONST.REG_EXP.EMOJI_RULE,
replacement: match => `<emoji>${match}</emoji>`
},
/**
* Apply the code-fence to avoid replacing anything inside of it that we're not supposed to
* (aka any rule with the '(?![^<]*<\/pre>)' avoidance in it
*/
{
name: 'codeFence',
// ` is a backtick symbol we are matching on three of them before then after a new line character
regex: /(```(?:\r\n|\n)?)((?:\s*?(?!(?:\r\n|\n)?```(?!`))[\S])+\s*?)((?=(?:\r\n|\n)?)```)/g,
// We're using a function here to perform an additional replace on the content
// inside the backticks because Android is not able to use <pre> tags and does
// not respect whitespace characters at all like HTML does. We do not want to mess
// with the new lines here since they need to be converted into <br>. And we don't
// want to do this anywhere else since that would break HTML.
// will create styling issues so use  
replacement: (match, __, textWithinFences) => {
const group = textWithinFences.replace(/(?:(?![\n\r])\s)/g, ' ');
return `<pre>${group}</pre>`;
},
rawInputReplacement: (match, __, textWithinFences) => {
const withinFences = match.replace(/(?:```)([\s\S]*?)(?:```)/g, '$1');
const group = textWithinFences.replace(/(?:(?![\n\r])\s)/g, ' ');
return `<pre data-code-raw="${withinFences}">${group}</pre>`;
},
},
/**
* Apply inline code-block to avoid applying any other formatting rules inside of it,
* like we do for the multi-line code-blocks
*/
{
name: 'inlineCodeBlock',
// Use the url escaped version of a backtick (`) symbol. Mobile platforms do not support lookbehinds,
// so capture the first and third group and place them in the replacement.
// but we should not replace backtick symbols if they include <pre> tags between them.
regex: /(\B|_|)`(?:(?!(?:(?!`).)*?<pre>))(.*?\S.*?)`(\B|_|)(?!`|[^<]*<\/pre>)/g,
replacement: (match, g1, g2, g3) => {
const regex = /^[`]+$/i;
// if content of the inline code block is only backtick symbols, we should not replace them with <code> tag
if (regex.test(g2)) {
return match;
}
return `${g1}<code>${g2}</code>${g3}`;
},
},
/**
* Converts markdown style links to anchor tags e.g. [Expensify](concierge@expensify.com)
* We need to convert before the auto email link rule and the manual link rule since it will not try to
* create a link from an existing anchor tag.
*/
{
name: 'email',
process: (textToProcess, replacement, shouldKeepRawInput) => {
const regex = new RegExp(`(?!\\[\\s*\\])\\[([^[\\]]*)]\\((mailto:)?${Constants.CONST.REG_EXP.MARKDOWN_EMAIL}\\)`, 'gim');
return this.modifyTextForEmailLinks(regex, textToProcess, replacement, shouldKeepRawInput);
},
replacement: (match, g1, g2) => {
if (g1.match(Constants.CONST.REG_EXP.EMOJIS) || !g1.trim()) {
return match;
}
const label = g1.trim();
const href = `mailto:${g2}`;
const formattedLabel = label === href ? g2 : label;
return `<a href="${href}">${formattedLabel}</a>`;
},
rawInputReplacement: (match, g1, g2, g3) => {
if (g1.match(Constants.CONST.REG_EXP.EMOJIS) || !g1.trim()) {
return match;
}
const dataRawHref = g2 ? g2 + g3 : g3;
const href = `mailto:${g3}`;
return `<a href="${href}" data-raw-href="${dataRawHref}" data-link-variant="labeled">${g1}</a>`;
},
},
{
name: 'heading1',
process: (textToProcess, replacement, shouldKeepRawInput = false) => {
const regexp = shouldKeepRawInput ? /^# ( *(?! )(?:(?!<pre>|\n|\r\n).)+)/gm : /^# +(?! )((?:(?!<pre>|\n|\r\n).)+)/gm;
return textToProcess.replace(regexp, replacement);
},
replacement: '<h1>$1</h1>',
},
/**
* Converts markdown style images to img tags e.g. 
* We need to convert before linking rules since they will not try to create a link from an existing img
* tag.
* Additional sanitization is done to the alt attribute to prevent parsing it further to html by later
* rules.
*/
{
name: 'image',
regex: MARKDOWN_IMAGE_REGEX,
replacement: (match, g1, g2) => `<img src="${Str.sanitizeURL(g2)}"${g1 ? ` alt="${this.escapeAttributeContent(g1)}"` : ''} />`,
rawInputReplacement: (match, g1, g2) => `<img src="${Str.sanitizeURL(g2)}"${g1 ? ` alt="${this.escapeAttributeContent(g1)}"` : ''} data-raw-href="${g2}" data-link-variant="${typeof (g1) === 'string' ? 'labeled' : 'auto'}" />`
},
/**
* Converts markdown style links to anchor tags e.g. [Expensify](https://www.expensify.com)
* We need to convert before the autolink rule since it will not try to create a link
* from an existing anchor tag.
*/
{
name: 'link',
process: (textToProcess, replacement) => this.modifyTextForUrlLinks(MARKDOWN_LINK_REGEX, textToProcess, replacement),
replacement: (match, g1, g2) => {
if (g1.match(Constants.CONST.REG_EXP.EMOJIS) || !g1.trim()) {
return match;
}
return `<a href="${Str.sanitizeURL(g2)}" target="_blank" rel="noreferrer noopener">${g1.trim()}</a>`;
},
rawInputReplacement: (match, g1, g2) => {
if (g1.match(Constants.CONST.REG_EXP.EMOJIS) || !g1.trim()) {
return match;
}
return `<a href="${Str.sanitizeURL(g2)}" data-raw-href="${g2}" data-link-variant="labeled" target="_blank" rel="noreferrer noopener">${g1.trim()}</a>`;
},
},
/**
* Apply the hereMention first because the string @here is still a valid mention for the userMention regex.
* This ensures that the hereMention is always considered first, even if it is followed by a valid
* userMention.
*
* Also, apply the mention rule after email/link to prevent mention appears in an email/link.
*/
{
name: 'hereMentions',
regex: /([a-zA-Z0-9.!$%&+/=?^`{|}_-]?)(@here)([.!$%&+/=?^`{|}_-]?)(?=\b)(?!([\w'#%+-]*@(?:[a-z\d-]+\.)+[a-z]{2,}(?:\s|$|@here))|((?:(?!<a).)+)?<\/a>|[^<]*(<\/pre>|<\/code>))/gm,
replacement: (match, g1, g2, g3) => {
if (!Str.isValidMention(match)) {
return match;
}
return `${g1}<mention-here>${g2}</mention-here>${g3}`;
},
},
/**
* A room mention is a string that starts with the '#' symbol and is followed by a valid room name.
*
* Note: We are allowing mentions in a format of #room-name The room name can contain any
* combination of letters and hyphens
*/
{
name: 'reportMentions',
regex: /(?<![^ \n*~_])(#[\p{Ll}0-9-]{1,80})/gmiu,
replacement: '<mention-report>$1</mention-report>',
},
/**
* This regex matches a valid user mention in a string.
* A user mention is a string that starts with the '@' symbol and is followed by a valid user's primary
* login
*
* Note: currently we are only allowing mentions in a format of @+19728974297 (E.164 format phone number)
* and @username@example.com The username can contain any combination of alphanumeric letters, numbers, and
* underscores
*/
{
name: 'userMentions',
regex: new RegExp(`(@here|[a-zA-Z0-9.!$%&+=?^\`{|}-]?)(@${Constants.CONST.REG_EXP.EMAIL_PART}|@${Constants.CONST.REG_EXP.PHONE_PART})(?!((?:(?!<a).)+)?<\\/a>|[^<]*(<\\/pre>|<\\/code>))`, 'gim'),
replacement: (match, g1, g2) => {
if (!Str.isValidMention(match)) {
return match;
}
const phoneRegex = new RegExp(`^@${Constants.CONST.REG_EXP.PHONE_PART}$`);
return `${g1}<mention-user>${g2}${phoneRegex.test(g2) ? `@${Constants.CONST.SMS.DOMAIN}` : ''}</mention-user>`;
},
rawInputReplacement: (match, g1, g2) => {
if (!Str.isValidMention(match)) {
return match;
}
return `${g1}<mention-user>${g2}</mention-user>`;
},
},
{
name: 'hereMentionAfterUserMentions',
regex: /(<\/mention-user>)(@here)(?=\b)/gm,
replacement: '$1<mention-here>$2</mention-here>',
},
/**
* Automatically link urls. Runs last of our linkers since we want anything manual to link before this,
* and we do not want to break emails.
*/
{
name: 'autolink',
process: (textToProcess, replacement) => {
const regex = new RegExp(
`(?![^<]*>|[^<>]*<\\/(?!h1>))([_*~]*?)${UrlPatterns.MARKDOWN_URL_REGEX}\\1(?!((?:(?!<a).)+)?<\\/a>|[^<]*(<\\/pre>|<\\/code>|.+\\/>))`,
'gi',
);
return this.modifyTextForUrlLinks(regex, textToProcess, replacement);
},
replacement: (match, g1, g2) => {
const href = Str.sanitizeURL(g2);
return `${g1}<a href="${href}" target="_blank" rel="noreferrer noopener">${g2}</a>${g1}`;
},
rawInputReplacement: (_match, g1, g2) => {
const href = Str.sanitizeURL(g2);
return `${g1}<a href="${href}" data-raw-href="${g2}" data-link-variant="auto" target="_blank" rel="noreferrer noopener">${g2}</a>${g1}`;
}
},
{
name: 'quote',
// We also want to capture a blank line before or after the quote so that we do not add extra spaces.
// block quotes naturally appear on their own line. Blockquotes should not appear in code fences or
// inline code blocks. A single prepending space should be stripped if it exists
process: (textToProcess, replacement, shouldKeepRawInput = false) => {
const regex = /^> *(?! )(?![^<]*(?:<\/pre>|<\/code>))([^\v\n\r]+)/gm;
if (shouldKeepRawInput) {
return textToProcess.replace(regex, (g1) => replacement(g1, shouldKeepRawInput));
}
return this.modifyTextForQuote(regex, textToProcess, replacement);
},
replacement: (g1, shouldKeepRawInput = false) => {
// We want to enable 2 options of nested heading inside the blockquote: "># heading" and "> # heading".
// To do this we need to parse body of the quote without first space
let isStartingWithSpace = false;
const textToReplace = g1.replace(/^>( )?/gm, (match, g2) => {
if (shouldKeepRawInput) {
isStartingWithSpace = !!g2;
return '';
}
return match;
});
const filterRules = ['heading1'];
// if we don't reach the max quote depth we allow the recursive call to process possible quote
if (this.currentQuoteDepth < this.maxQuoteDepth - 1) {
filterRules.push('quote');
this.currentQuoteDepth++;
}
const replacedText = this.replace(textToReplace, {
filterRules,
shouldEscapeText: false,
shouldKeepRawInput
});
this.currentQuoteDepth = 0;
return `<blockquote>${isStartingWithSpace ? ' ' : ''}${replacedText}</blockquote>`;
},
},
{
/**
* Use \b in this case because it will match on words, letters,
* and _: https://www.rexegg.com/regex-boundaries.html#wordboundary
* The !_blank is to prevent the `target="_blank">` section of the
* link replacement from being captured Additionally, something like
* `\b\_([^<>]*?)\_\b` doesn't work because it won't replace
* `_https://www.test.com_`
* Use [\s\S]* instead of .* to match newline
*/
name: 'italic',
regex: /(?<!<[^>]*)(\b_+|\b)(?!_blank")_((?![\s_])[\s\S]*?[^\s_](?<!\s))_(?![^\W_])(?![^<]*>)(?![^<]*(<\/pre>|<\/code>|<\/a>|<\/mention-user>|_blank))/g,
// We want to add extraLeadingUnderscores back before the <em> tag unless textWithinUnderscores starts with valid email
replacement: (match, extraLeadingUnderscores, textWithinUnderscores) => {
if (textWithinUnderscores.includes('</pre>') || this.containsNonPairTag(textWithinUnderscores)) {
return match;
}
if (String(textWithinUnderscores).match(`^${Constants.CONST.REG_EXP.MARKDOWN_EMAIL}`)) {
return `<em>${extraLeadingUnderscores}${textWithinUnderscores}</em>`;
}
return `${extraLeadingUnderscores}<em>${textWithinUnderscores}</em>`;
},
},
/**
* Automatically links emails that are not in a link. Runs before the autolinker as it will not link an
* email that is in a link
* Prevent emails from starting with [~_*]. Such emails should not be supported.
*/
{
name: 'autoEmail',
regex: new RegExp(`([^\\w'#%+-]|^)${Constants.CONST.REG_EXP.MARKDOWN_EMAIL}(?!((?:(?!<a).)+)?<\\/a>|[^<>]*<\\/(?!em|h1|blockquote))`, 'gim'),
replacement: '$1<a href="mailto:$2">$2</a>',
rawInputReplacement: '$1<a href="mailto:$2" data-raw-href="$2" data-link-variant="auto">$2</a>',
},
{
// Use \B in this case because \b doesn't match * or ~.
// \B will match everything that \b doesn't, so it works
// for * and ~: https://www.rexegg.com/regex-boundaries.html#notb
name: 'bold',
regex: /(?<!<[^>]*)\B\*(?![^<]*(?:<\/pre>|<\/code>|<\/a>))((?![\s*])[\s\S]*?[^\s*](?<!\s))\*\B(?![^<]*>)(?![^<]*(<\/pre>|<\/code>|<\/a>))/g,
replacement: (match, g1) => (g1.includes('</pre>') || this.containsNonPairTag(g1) ? match : `<strong>${g1}</strong>`),
},
{
name: 'strikethrough',
regex: /(?<!<[^>]*)\B~((?![\s~])[\s\S]*?[^\s~](?<!\s))~\B(?![^<]*>)(?![^<]*(<\/pre>|<\/code>|<\/a>))/g,
replacement: (match, g1) => (g1.includes('</pre>') || this.containsNonPairTag(g1) ? match : `<del>${g1}</del>`),
},
{
name: 'newline',
regex: /\r?\n/g,
replacement: '<br />',
},
{
// We're removing <br /> because when </pre> and <br /> occur together, an extra line is added.
name: 'replacepre',
regex: /<\/pre>\s*<br\s*[/]?>/gi,
replacement: '</pre>',
},
{
// We're removing <br /> because when <h1> and <br /> occur together, an extra line is added.
name: 'replaceh1br',
regex: /<\/h1><br\s*[/]?>/gi,
replacement: '</h1>',
},
];
/**
* The list of regex replacements to do on a HTML comment for converting it to markdown.
* Order of rules is important
* @type {Object[]}
*/
this.htmlToMarkdownRules = [
// Used to Exclude tags
{
name: 'replacepre',
regex: /<\/pre>(.)/gi,
replacement: '</pre><br />$1',
},
{
name: 'exclude',
regex: new RegExp(['<(script|style)(?:"[^"]*"|\'[^\']*\'|[^\'">])*>([\\s\\S]*?)<\\/\\1>', '(?![^<]*(<\\/pre>|<\\/code>))(\n|\r\n)?'].join(''), 'gim'),
replacement: '',
},
{
name: 'nested',
regex: /<(pre)(?:"[^"]*"|'[^']*'|[^'">])*><(div|code)(?:"[^"]*"|'[^']*'|[^'">])*>([\s\S]*?)<\/\2><\/pre>/gi,
replacement: '<pre>$3</pre>',
},
{
name: 'newline',
// Replaces open and closing <br><br/> tags with a single <br/>
// Slack uses special <span> tag for empty lines instead of <br> tag
pre: (inputString) =>
inputString
.replace('<br></br>', '<br/>')
.replace('<br><br/>', '<br/>')
.replace(/(<tr.*?<\/tr>)/g, '$1<br/>')
.replace('<br/></tbody>', '')
.replace(SLACK_SPAN_NEW_LINE_TAG + SLACK_SPAN_NEW_LINE_TAG, '<br/><br/><br/>')
.replace(SLACK_SPAN_NEW_LINE_TAG, '<br/><br/>'),
// Include the immediately followed newline as `<br>\n` should be equal to one \n.
regex: /<br(?:"[^"]*"|'[^']*'|[^'"><])*>\n?/gi,
replacement: '\n',
},
{
name: 'heading1',
regex: /[^\S\r\n]*<(h1)(?:"[^"]*"|'[^']*'|[^'">])*>(.*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))/gi,
replacement: '<h1># $2</h1>',
},
{
name: 'listItem',
regex: /\s*<(li)(?:"[^"]*"|'[^']*'|[^'">])*>(.*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))\s*/gi,
replacement: '<li> $2</li>',
},
// Use [\s\S]* instead of .* to match newline
{
name: 'italic',
regex: /<(em|i)(?:"[^"]*"|'[^']*'|[^'">])*>([\s\S]*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))/gi,
replacement: '_$2_',
},
{
name: 'bold',
regex: /<(b|strong)(?:"[^"]*"|'[^']*'|[^'">])*>([\s\S]*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))/gi,
replacement: '*$2*',
},
{
name: 'strikethrough',
regex: /<(del|s)(?:"[^"]*"|'[^']*'|[^'">])*>([\s\S]*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))/gi,
replacement: '~$2~',
},
{
name: 'quote',
regex: /<(blockquote|q)(?:"[^"]*"|'[^']*'|[^'">])*>([\s\S]*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))/gi,
replacement: (match, g1, g2) => {
// We remove the line break before heading inside quote to avoid adding extra line
let resultString = g2
.replace(/\n?(<h1># )/g, '$1')
.replace(/(<h1>|<\/h1>)+/g, '\n')
.trim()
.split('\n');
resultString = _.map(resultString, (m) => `> ${m}`).join('\n');
// We want to keep <blockquote> tag here and let method replaceBlockElementWithNewLine to handle the line break later
return `<blockquote>${resultString}</blockquote>`;
},
},
{
name: 'inlineCodeBlock',
regex: /<(code)(?:"[^"]*"|'[^']*'|[^'">])*>(.*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))/gi,
replacement: '`$2`',
},
{
name: 'codeFence',
regex: /<(pre)(?:"[^"]*"|'[^']*'|[^'">])*>([\s\S]*?)(\n?)<\/\1>(?![^<]*(<\/pre>|<\/code>))/gi,
replacement: (match, g1, g2) => `\`\`\`\n${g2}\n\`\`\``,
},
{
name: 'anchor',
regex: /<(a)[^><]*href\s*=\s*(['"])(.*?)\2(?:".*?"|'.*?'|[^'"><])*>([\s\S]*?)<\/\1>(?![^<]*(<\/pre>|<\/code>))/gi,
replacement: (match, g1, g2, g3, g4) => {
const email = g3.startsWith('mailto:') ? g3.slice(7) : '';
if (email === g4) {
return email;
}
return `[${g4}](${email || g3})`;
},
},
{
name: 'image',
regex: /<img[^><]*src\s*=\s*(['"])(.*?)\1(?:[^><]*alt\s*=\s*(['"])(.*?)\3)?[^><]*>*(?![^<][\s\S]*?(<\/pre>|<\/code>))/gi,
replacement: (match, g1, g2, g3, g4) => {
if (g4) {
return ``;
}
return `!(${g2})`;
}
},
{
name: 'reportMentions',
regex: /<mention-report reportID="(\d+)" *\/>/gi,
replacement: (match, g1, offset, string, extras) => {
const reportToNameMap = extras.reportIdToName;
if (!reportToNameMap || !reportToNameMap[g1]) {
return '';
}
return reportToNameMap[g1];
},
},
{
name: 'userMention',
regex: /<mention-user accountID="(\d+)" *\/>/gi,
replacement: (match, g1, offset, string, extras) => {
const accountToNameMap = extras.accountIdToName;
if (!accountToNameMap || !accountToNameMap[g1]) {
return '';
}
return `@${extras.accountIdToName[g1]}`;
},
},
];
/**
* The list of rules to covert the HTML to text.
* Order of rules is important
* @type {Object[]}
*/
this.htmlToTextRules = [
{
name: 'breakline',
regex: /<br[^>]*>/gi,
replacement: '\n',
},
{
name: 'blockquoteWrapHeadingOpen',
regex: /<blockquote><h1>/gi,
replacement: '<blockquote>',
},
{
name: 'blockquoteWrapHeadingClose',
regex: /<\/h1><\/blockquote>/gi,
replacement: '</blockquote>',
},
{
name: 'blockElementOpen',
regex: /(.|\s)<(blockquote|h1|pre)>/gi,
replacement: '$1\n',
},
{
name: 'blockElementClose',
regex: /<\/(blockquote|h1|pre)>(.|\s)/gm,
replacement: '\n$2',
},
{
name: 'removeStyle',
regex: /<style>.*?<\/style>/gi,
replacement: '',
},
{
name: 'image',
regex: /<img[^><]*src\s*=\s*(['"])(.*?)\1(?:[^><]*alt\s*=\s*(['"])(.*?)\3)?[^><]*>*(?![^<][\s\S]*?(<\/pre>|<\/code>))/gi,
replacement: '[Attachment]',
},
{
name: 'reportMentions',
regex: /<mention-report reportID="(\d+)" *\/>/gi,
replacement: (match, g1, offset, string, extras) => {
const reportToNameMap = extras.reportIdToName;
if (!reportToNameMap || !reportToNameMap[g1]) {
return '';
}
return reportToNameMap[g1];
},
},
{
name: 'userMention',
regex: /<mention-user accountID="(\d+)" *\/>/gi,
replacement: (match, g1, offset, string, extras) => {
const accountToNameMap = extras.accountIdToName;
if (!accountToNameMap || !accountToNameMap[g1]) {
return '';
}
return `@${extras.accountIdToName[g1]}`;
},
},
{
name: 'stripTag',
regex: /(<([^>]+)>)/gi,
replacement: '',
}
];
/**
* The list of rules that we have to exclude in shouldKeepWhitespaceRules list.
* @type {Object[]}
*/
this.whitespaceRulesToDisable = ['newline', 'replacepre', 'replacebr', 'replaceh1br'];
/**
* The list of rules that have to be applied when shouldKeepWhitespace flag is true.
* @type {Object[]}
*/
this.shouldKeepWhitespaceRules = _.filter(this.rules, (rule) => !_.includes(this.whitespaceRulesToDisable, rule.name));
/**
* maxQuoteDepth is the maximum depth of nested quotes that we want to support.
* @type {Number}
*/
this.maxQuoteDepth = 3;
/**
* currentQuoteDepth is the current depth of nested quotes that we are processing.
* @type {Number}
*/
this.currentQuoteDepth = 0;
}
getHtmlRuleset(filterRules, disabledRules, shouldKeepRawInput) {
let rules = this.rules;
if(shouldKeepRawInput) {
rules = this.shouldKeepWhitespaceRules;
}
if (!_.isEmpty(filterRules)) {
rules = _.filter(this.rules, (rule) => _.contains(filterRules, rule.name));
}
if (!_.isEmpty(disabledRules)) {
rules = _.filter(rules, (rule) => !_.contains(disabledRules, rule.name));
}
return rules;
}
/**
* Replaces markdown with html elements
*
* @param {String} text - Text to parse as markdown
* @param {Object} [options] - Options to customize the markdown parser
* @param {String[]} [options.filterRules=[]] - An array of name of rules as defined in this class.
* If not provided, all available rules will be applied.
* @param {Boolean} [options.shouldEscapeText=true] - Whether or not the text should be escaped
* @param {String[]} [options.disabledRules=[]] - An array of name of rules as defined in this class.
* If not provided, all available rules will be applied. If provided, the rules in the array will be skipped.
*
* @returns {String}
*/
replace(text, {filterRules = [], shouldEscapeText = true, shouldKeepRawInput = false, disabledRules = []} = {}) {
// This ensures that any html the user puts into the comment field shows as raw html
let replacedText = shouldEscapeText ? _.escape(text) : text;
const rules = this.getHtmlRuleset(filterRules, disabledRules, shouldKeepRawInput);
try {
rules.forEach((rule) => {
// Pre-process text before applying regex
if (rule.pre) {
replacedText = rule.pre(replacedText);
}
const replacementFunction = shouldKeepRawInput && rule.rawInputReplacement ? rule.rawInputReplacement : rule.replacement;
if (rule.process) {
replacedText = rule.process(replacedText, replacementFunction, shouldKeepRawInput);
} else {
replacedText = replacedText.replace(rule.regex, replacementFunction);
}
// Post-process text after applying regex
if (rule.post) {
replacedText = rule.post(replacedText);
}
});
} catch (e) {
// eslint-disable-next-line no-console
console.warn('Error replacing text with html in ExpensiMark.replace', {error: e});
// We want to return text without applying rules if exception occurs during replacing
return shouldEscapeText ? _.escape(text) : text;
}
return replacedText;
}
/**
* Checks matched URLs for validity and replace valid links with html elements
*
* @param {RegExp} regex
* @param {String} textToCheck
* @param {Function} replacement
*
* @returns {String}
*/
modifyTextForUrlLinks(regex, textToCheck, replacement) {
let match = regex.exec(textToCheck);
let replacedText = '';
let startIndex = 0;
while (match !== null) {
// We end the link at the last closing parenthesis that matches an opening parenthesis because unmatched closing parentheses are unlikely to be in the url
// and can be part of markdown for example
let unmatchedOpenParentheses = 0;
let url = match[2];
for (let i = 0; i < url.length; i++) {
if (url[i] === '(') {
unmatchedOpenParentheses++;
} else if (url[i] === ')') {
// Unmatched closing parenthesis
if (unmatchedOpenParentheses <= 0) {
const numberOfCharsToRemove = url.length - i;
match[0] = match[0].substr(0, match[0].length - numberOfCharsToRemove);
url = url.substr(0, url.length - numberOfCharsToRemove);
break;
}
unmatchedOpenParentheses--;
}
}
// Because we are removing ) parenthesis, some special characters that shouldn't be in the href are in the href
// For example google.com/toto.) is accepted by the regular expression above and we remove the ) parenthesis, so the link becomes google.com/toto. which is not a valid link
// In that case we should also remove the "."
// Those characters should only be remove from the url if this url doesn't have a parameter or a fragment
if (!url.includes('?') && !url.includes('#')) {
let numberOfCharsToRemove = 0;
for (let i = url.length - 1; i >= 0; i--) {
if (Constants.CONST.SPECIAL_CHARS_TO_REMOVE.includes(url[i])) {
numberOfCharsToRemove++;
} else {
break;
}
}
if (numberOfCharsToRemove) {
match[0] = match[0].substring(0, match[0].length - numberOfCharsToRemove);
url = url.substring(0, url.length - numberOfCharsToRemove);
}
}
replacedText = replacedText.concat(textToCheck.substr(startIndex, match.index - startIndex));
// We want to avoid matching domains in email addresses so we don't render them as URLs,
// but we need to check if there are valid URLs after the email address and render them accordingly,
// e.g. test@expensify.com/https://www.test.com
let isDoneMatching = false;
let shouldApplyAutoLinkAgain = true;
// If we find a URL with a leading @ sign, we need look for other domains in the rest of the string
if (match.index !== 0 && textToCheck[match.index - 1] === '@') {
const domainRegex = /^(([a-z-0-9]+\.)+[a-z]{2,})(\S*)/i;
const domainMatch = domainRegex.exec(url);
// If we find another domain in the remainder of the string, we apply the auto link rule again and set a flag to avoid re-doing below.
if (domainMatch !== null && domainMatch[3] !== '') {
replacedText = replacedText.concat(domainMatch[1] + this.replace(domainMatch[3], {filterRules: ['autolink']}));
shouldApplyAutoLinkAgain = false;
} else {
// Otherwise, we're done applying rules
isDoneMatching = true;
}
}
// We don't want to apply link rule if match[1] contains the code block inside the [] of the markdown e.g. [```example```](https://example.com)
// or if match[1] is multiline text preceeded by markdown heading, e.g., # [example\nexample\nexample](https://example.com)
if (isDoneMatching || match[1].includes('</pre>') || match[1].includes('</h1>')) {
replacedText = replacedText.concat(textToCheck.substr(match.index, match[0].length));
} else if (shouldApplyAutoLinkAgain) {
const urlRegex = new RegExp(`^${UrlPatterns.LOOSE_URL_REGEX}$|^${UrlPatterns.URL_REGEX}$`, 'i');
// `match[1]` contains the text inside the [] of the markdown e.g. [example](https://example.com)
// At the entry of function this.replace, text is already escaped due to the rules that precede the link
// rule (eg, codeFence, inlineCodeBlock, email), so we don't need to escape the text again here.
// If the text `match[1]` exactly matches a URL, we skip translating the filterRules
// So that special characters such as ['_', '*', '~'] are preserved in the text.
const linkText = urlRegex.test(match[1])
? match[1]
: this.replace(match[1], {
filterRules: ['bold', 'strikethrough', 'italic'],
shouldEscapeText: false,
});
replacedText = replacedText.concat(replacement(match[0], linkText, url));
}
startIndex = match.index + match[0].length;
// Now we move to the next match that the js regex found in the text
match = regex.exec(textToCheck);
}
if (startIndex < textToCheck.length) {
replacedText = replacedText.concat(textToCheck.substr(startIndex));
}
return replacedText;
}
/**
* Checks matched Emails for validity and replace valid links with html elements
*
* @param {RegExp} regex
* @param {String} textToCheck
* @param {Function} replacement
* @param {Boolean} shouldKeepRawInput
*
* @returns {String}
*/
modifyTextForEmailLinks(regex, textToCheck, replacement, shouldKeepRawInput) {
let match = regex.exec(textToCheck);
let replacedText = '';
let startIndex = 0;
while (match !== null) {
replacedText = replacedText.concat(textToCheck.substr(startIndex, match.index - startIndex));
// `match[1]` contains the text inside []. Text is already escaped due to the rules
// that precede the link rule (eg, codeFence, inlineCodeBlock, email).
const linkText = this.replace(match[1], {
filterRules: ['bold', 'strikethrough', 'italic'],
shouldEscapeText: false,
});
// rawInputReplacment needs to be called with additional parameters from match
const replacedMatch = shouldKeepRawInput ? replacement(match[0], linkText, match[2], match[3]) : replacement(match[0], linkText, match[3]);
replacedText = replacedText.concat(replacedMatch);
startIndex = match.index + match[0].length;
// Now we move to the next match that the js regex found in the text
match = regex.exec(textToCheck);
}
if (startIndex < textToCheck.length) {
replacedText = replacedText.concat(textToCheck.substr(startIndex));
}
return replacedText;
}
/**
* replace block element with '\n' if :
* 1. We have text within the element.
* 2. The text does not end with a new line.
* 3. The text does not have quote mark '>' .
* 4. It's not the last element in the string.
*
* @param {String} htmlString
* @returns {String}
*/
replaceBlockElementWithNewLine(htmlString) {
// eslint-disable-next-line max-len
let splitText = htmlString.split(
/<div.*?>|<\/div>|<comment.*?>|\n<\/comment>|<\/comment>|<h1>|<\/h1>|<h2>|<\/h2>|<h3>|<\/h3>|<h4>|<\/h4>|<h5>|<\/h5>|<h6>|<\/h6>|<p>|<\/p>|<li>|<\/li>|<blockquote>|<\/blockquote>/,
);
splitText = _.map(splitText, (text) => Str.stripHTML(text));
let joinedText = '';
// Delete whitespace at the end
while (splitText.length) {
if (splitText[splitText.length - 1].trim().length > 0 || splitText[splitText.length - 1].match(/\n/)) {
break;
}
splitText.pop();
}
splitText.forEach((text, index) => {
if (text.trim().length === 0 && !text.match(/\n/)) {
return;
}
// Insert '\n' unless it ends with '\n' or '>' or it's the last element.
if (text.match(/[\n|>][>]?[\s]?$/) || index === splitText.length - 1) {
joinedText += text;
} else {
joinedText += `${text}\n`;
}
});
return joinedText;
}
/**
* Replaces HTML with markdown
*
* @param {String} htmlString
* @param {Object} extras
*
* @returns {String}
*/
htmlToMarkdown(htmlString, extras = {}) {
let generatedMarkdown = htmlString;
const body = /<(body)(?:"[^"]*"|'[^']*'|[^'"><])*>(?:\n|\r\n)?([\s\S]*?)(?:\n|\r\n)?<\/\1>(?![^<]*(<\/pre>|<\/code>))/im;
const parseBodyTag = generatedMarkdown.match(body);
// If body tag is found then use the content of body rather than the whole HTML
if (parseBodyTag) {
generatedMarkdown = parseBodyTag[2];
}
this.htmlToMarkdownRules.forEach((rule) => {
// Pre-processes input HTML before applying regex
if (rule.pre) {
generatedMarkdown = rule.pre(generatedMarkdown);
}
// if replacement is a function, we want to pass optional extras to it
const replacementFunction = typeof rule.replacement === 'function' ? (...args) => rule.replacement(...args, extras) : rule.replacement;
generatedMarkdown = generatedMarkdown.replace(rule.regex, replacementFunction);
});
return Str.htmlDecode(this.replaceBlockElementWithNewLine(generatedMarkdown));
}
/**
* Convert HTML to text
*
* @param {String} htmlString
* @param {Object} extras
*
* @returns {String}
*/
htmlToText(htmlString, extras) {
let replacedText = htmlString;
this.htmlToTextRules.forEach((rule) => {
// if replacement is a function, we want to pass optional extras to it
const replacementFunction = typeof rule.replacement === 'function' ? (...args) => rule.replacement(...args, extras) : rule.replacement;
replacedText = replacedText.replace(rule.regex, replacementFunction);
});
// Unescaping because the text is escaped in 'replace' function
// We use 'htmlDecode' instead of 'unescape' to replace entities like ' '
replacedText = Str.htmlDecode(replacedText);
return replacedText;
}
/**
* Modify text for Quotes replacing chevrons with html elements
*
* @param {RegExp} regex
* @param {String} textToCheck
* @param {Function} replacement
*
* @returns {String}
*/
modifyTextForQuote(regex, textToCheck, replacement) {
let replacedText = '';
let textToFormat = '';
const match = textToCheck.match(regex);
// If there's matches we need to modify the quotes
if (match !== null) {
let insideCodefence = false;
// Split the textToCheck in lines
const textSplitted = textToCheck.split('\n');
for (let i = 0; i < textSplitted.length; i++) {
if (!insideCodefence) {
// We need to know when there is a start of codefence so we dont quote
insideCodefence = Str.contains(textSplitted[i], '<pre>');
}
// We only want to modify lines starting with > that is not codefence
if (Str.startsWith(textSplitted[i], '>') && !insideCodefence) {
textToFormat += `${textSplitted[i]}\n`;
} else {
// Make sure we will only modify if we have Text needed to be formatted for quote
if (textToFormat !== '') {
replacedText += this.formatTextForQuote(regex, textToFormat, replacement);
textToFormat = '';
}
// We dont want a \n after the textSplitted if it is the last row
if (i === textSplitted.length - 1) {
replacedText += `${textSplitted[i]}`;
} else {
replacedText += `${textSplitted[i]}\n`;
}
// We need to know when we are not inside codefence anymore
if (insideCodefence) {
insideCodefence = !Str.contains(textSplitted[i], '</pre>');
}
}
}
// When loop ends we need the last quote to be formatted if we have quotes at last rows
if (textToFormat !== '') {
replacedText += this.formatTextForQuote(regex, textToFormat, replacement);
}
} else {
// If we doesn't have matches make sure the function will return the same textToCheck
replacedText = textToCheck;
}
return replacedText;
}
/**
* Format the content of blockquote if the text matches the regex or else just return the original text
*
* @param {RegExp} regex
* @param {String} textToCheck
* @param {Function} replacement
*
* @returns {String}
*/
formatTextForQuote(regex, textToCheck, replacement) {
if (textToCheck.match(regex)) {
// Remove '>' and trim the spaces between nested quotes
let textToFormat = _.map(textToCheck.split('\n'), (row) => {
const quoteContent = row[4] === ' ' ? row.substr(5) : row.substr(4);
if (quoteContent.trimStart().startsWith('>')) {
return quoteContent.trimStart();
}
return quoteContent;
}).join('\n');
// Remove leading and trailing line breaks
textToFormat = textToFormat.replace(/^\n+|\n+$/g, '');
return replacement(textToFormat);
}
return textToCheck;
}
/**
* Check if the input text includes only the open or the close tag of an element.
*
* @param {String} textToCheck - Text to check
*
* @returns {Boolean}
*/
containsNonPairTag(textToCheck) {
// Create a regular expression to match HTML tags
const tagRegExp = /<([a-z][a-z0-9-]*)\b[^>]*>|<\/([a-z][a-z0-9-]*)\s*>/gi;
// Use a stack to keep track of opening tags
const tagStack = [];
// Match all HTML tags in the string