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showdown.js
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showdown.js
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;/*! showdown v 2.0.0 - 10-03-2022 */
(function(){
/**
* Created by Tivie on 13-07-2015.
*/
function getDefaultOpts (simple) {
'use strict';
var defaultOptions = {
omitExtraWLInCodeBlocks: {
defaultValue: false,
describe: 'Omit the default extra whiteline added to code blocks',
type: 'boolean'
},
noHeaderId: {
defaultValue: false,
describe: 'Turn on/off generated header id',
type: 'boolean'
},
prefixHeaderId: {
defaultValue: false,
describe: 'Add a prefix to the generated header ids. Passing a string will prefix that string to the header id. Setting to true will add a generic \'section-\' prefix',
type: 'string'
},
rawPrefixHeaderId: {
defaultValue: false,
describe: 'Setting this option to true will prevent showdown from modifying the prefix. This might result in malformed IDs (if, for instance, the " char is used in the prefix)',
type: 'boolean'
},
ghCompatibleHeaderId: {
defaultValue: false,
describe: 'Generate header ids compatible with github style (spaces are replaced with dashes, a bunch of non alphanumeric chars are removed)',
type: 'boolean'
},
rawHeaderId: {
defaultValue: false,
describe: 'Remove only spaces, \' and " from generated header ids (including prefixes), replacing them with dashes (-). WARNING: This might result in malformed ids',
type: 'boolean'
},
headerLevelStart: {
defaultValue: false,
describe: 'The header blocks level start',
type: 'integer'
},
parseImgDimensions: {
defaultValue: false,
describe: 'Turn on/off image dimension parsing',
type: 'boolean'
},
simplifiedAutoLink: {
defaultValue: false,
describe: 'Turn on/off GFM autolink style',
type: 'boolean'
},
literalMidWordUnderscores: {
defaultValue: false,
describe: 'Parse midword underscores as literal underscores',
type: 'boolean'
},
literalMidWordAsterisks: {
defaultValue: false,
describe: 'Parse midword asterisks as literal asterisks',
type: 'boolean'
},
strikethrough: {
defaultValue: false,
describe: 'Turn on/off strikethrough support',
type: 'boolean'
},
tables: {
defaultValue: false,
describe: 'Turn on/off tables support',
type: 'boolean'
},
tablesHeaderId: {
defaultValue: false,
describe: 'Add an id to table headers',
type: 'boolean'
},
ghCodeBlocks: {
defaultValue: true,
describe: 'Turn on/off GFM fenced code blocks support',
type: 'boolean'
},
tasklists: {
defaultValue: false,
describe: 'Turn on/off GFM tasklist support',
type: 'boolean'
},
smoothLivePreview: {
defaultValue: false,
describe: 'Prevents weird effects in live previews due to incomplete input',
type: 'boolean'
},
smartIndentationFix: {
defaultValue: false,
describe: 'Tries to smartly fix indentation in es6 strings',
type: 'boolean'
},
disableForced4SpacesIndentedSublists: {
defaultValue: false,
describe: 'Disables the requirement of indenting nested sublists by 4 spaces',
type: 'boolean'
},
simpleLineBreaks: {
defaultValue: false,
describe: 'Parses simple line breaks as <br> (GFM Style)',
type: 'boolean'
},
requireSpaceBeforeHeadingText: {
defaultValue: false,
describe: 'Makes adding a space between `#` and the header text mandatory (GFM Style)',
type: 'boolean'
},
ghMentions: {
defaultValue: false,
describe: 'Enables github @mentions',
type: 'boolean'
},
ghMentionsLink: {
defaultValue: 'https://github.com/{u}',
describe: 'Changes the link generated by @mentions. Only applies if ghMentions option is enabled.',
type: 'string'
},
encodeEmails: {
defaultValue: true,
describe: 'Encode e-mail addresses through the use of Character Entities, transforming ASCII e-mail addresses into its equivalent decimal entities',
type: 'boolean'
},
openLinksInNewWindow: {
defaultValue: false,
describe: 'Open all links in new windows',
type: 'boolean'
},
backslashEscapesHTMLTags: {
defaultValue: false,
describe: 'Support for HTML Tag escaping. ex: \<div>foo\</div>',
type: 'boolean'
},
emoji: {
defaultValue: false,
describe: 'Enable emoji support. Ex: `this is a :smile: emoji`',
type: 'boolean'
},
underline: {
defaultValue: false,
describe: 'Enable support for underline. Syntax is double or triple underscores: `__underline word__`. With this option enabled, underscores no longer parses into `<em>` and `<strong>`',
type: 'boolean'
},
ellipsis: {
defaultValue: true,
describe: 'Replaces three dots with the ellipsis unicode character',
type: 'boolean'
},
completeHTMLDocument: {
defaultValue: false,
describe: 'Outputs a complete html document, including `<html>`, `<head>` and `<body>` tags',
type: 'boolean'
},
metadata: {
defaultValue: false,
describe: 'Enable support for document metadata (defined at the top of the document between `«««` and `»»»` or between `---` and `---`).',
type: 'boolean'
},
splitAdjacentBlockquotes: {
defaultValue: false,
describe: 'Split adjacent blockquote blocks',
type: 'boolean'
},
moreStyling: {
defaultValue: false,
describe: 'Adds some useful styling css classes in the generated html',
type: 'boolean'
},
relativePathBaseUrl: {
defaultValue: false,
describe: 'Prepends a base URL to relative paths',
type: 'string'
},
};
if (simple === false) {
return JSON.parse(JSON.stringify(defaultOptions));
}
var ret = {};
for (var opt in defaultOptions) {
if (defaultOptions.hasOwnProperty(opt)) {
ret[opt] = defaultOptions[opt].defaultValue;
}
}
return ret;
}
function allOptionsOn () {
'use strict';
var options = getDefaultOpts(true),
ret = {};
for (var opt in options) {
if (options.hasOwnProperty(opt)) {
ret[opt] = true;
}
}
return ret;
}
/**
* Created by Tivie on 06-01-2015.
*/
// Private properties
var showdown = {},
parsers = {},
extensions = {},
globalOptions = getDefaultOpts(true),
setFlavor = 'vanilla',
flavor = {
github: {
omitExtraWLInCodeBlocks: true,
simplifiedAutoLink: true,
literalMidWordUnderscores: true,
strikethrough: true,
tables: true,
tablesHeaderId: true,
ghCodeBlocks: true,
tasklists: true,
disableForced4SpacesIndentedSublists: true,
simpleLineBreaks: true,
requireSpaceBeforeHeadingText: true,
ghCompatibleHeaderId: true,
ghMentions: true,
backslashEscapesHTMLTags: true,
emoji: true,
splitAdjacentBlockquotes: true
},
original: {
noHeaderId: true,
ghCodeBlocks: false
},
ghost: {
omitExtraWLInCodeBlocks: true,
parseImgDimensions: true,
simplifiedAutoLink: true,
literalMidWordUnderscores: true,
strikethrough: true,
tables: true,
tablesHeaderId: true,
ghCodeBlocks: true,
tasklists: true,
smoothLivePreview: true,
simpleLineBreaks: true,
requireSpaceBeforeHeadingText: true,
ghMentions: false,
encodeEmails: true
},
vanilla: getDefaultOpts(true),
allOn: allOptionsOn()
};
/**
* helper namespace
* @type {{}}
*/
showdown.helper = {};
/**
* TODO LEGACY SUPPORT CODE
* @type {{}}
*/
showdown.extensions = {};
/**
* Set a global option
* @static
* @param {string} key
* @param {*} value
* @returns {showdown}
*/
showdown.setOption = function (key, value) {
'use strict';
globalOptions[key] = value;
return this;
};
/**
* Get a global option
* @static
* @param {string} key
* @returns {*}
*/
showdown.getOption = function (key) {
'use strict';
return globalOptions[key];
};
/**
* Get the global options
* @static
* @returns {{}}
*/
showdown.getOptions = function () {
'use strict';
return globalOptions;
};
/**
* Reset global options to the default values
* @static
*/
showdown.resetOptions = function () {
'use strict';
globalOptions = getDefaultOpts(true);
};
/**
* Set the flavor showdown should use as default
* @param {string} name
*/
showdown.setFlavor = function (name) {
'use strict';
if (!flavor.hasOwnProperty(name)) {
throw Error(name + ' flavor was not found');
}
showdown.resetOptions();
var preset = flavor[name];
setFlavor = name;
for (var option in preset) {
if (preset.hasOwnProperty(option)) {
globalOptions[option] = preset[option];
}
}
};
/**
* Get the currently set flavor
* @returns {string}
*/
showdown.getFlavor = function () {
'use strict';
return setFlavor;
};
/**
* Get the options of a specified flavor. Returns undefined if the flavor was not found
* @param {string} name Name of the flavor
* @returns {{}|undefined}
*/
showdown.getFlavorOptions = function (name) {
'use strict';
if (flavor.hasOwnProperty(name)) {
return flavor[name];
}
};
/**
* Get the default options
* @static
* @param {boolean} [simple=true]
* @returns {{}}
*/
showdown.getDefaultOptions = function (simple) {
'use strict';
return getDefaultOpts(simple);
};
/**
* Get or set a subParser
*
* subParser(name) - Get a registered subParser
* subParser(name, func) - Register a subParser
* @static
* @param {string} name
* @param {function} [func]
* @returns {*}
*/
showdown.subParser = function (name, func) {
'use strict';
if (showdown.helper.isString(name)) {
if (typeof func !== 'undefined') {
parsers[name] = func;
} else {
if (parsers.hasOwnProperty(name)) {
return parsers[name];
} else {
throw Error('SubParser named ' + name + ' not registered!');
}
}
} else {
throw Error('showdown.subParser function first argument must be a string (the name of the subparser)');
}
};
/**
* Gets or registers an extension
* @static
* @param {string} name
* @param {object|object[]|function=} ext
* @returns {*}
*/
showdown.extension = function (name, ext) {
'use strict';
if (!showdown.helper.isString(name)) {
throw Error('Extension \'name\' must be a string');
}
name = showdown.helper.stdExtName(name);
// Getter
if (showdown.helper.isUndefined(ext)) {
if (!extensions.hasOwnProperty(name)) {
throw Error('Extension named ' + name + ' is not registered!');
}
return extensions[name];
// Setter
} else {
// Expand extension if it's wrapped in a function
if (typeof ext === 'function') {
ext = ext();
}
// Ensure extension is an array
if (!showdown.helper.isArray(ext)) {
ext = [ext];
}
var validExtension = validate(ext, name);
if (validExtension.valid) {
extensions[name] = ext;
} else {
throw Error(validExtension.error);
}
}
};
/**
* Gets all extensions registered
* @returns {{}}
*/
showdown.getAllExtensions = function () {
'use strict';
return extensions;
};
/**
* Remove an extension
* @param {string} name
*/
showdown.removeExtension = function (name) {
'use strict';
delete extensions[name];
};
/**
* Removes all extensions
*/
showdown.resetExtensions = function () {
'use strict';
extensions = {};
};
/**
* Validate extension
* @param {array} extension
* @param {string} name
* @returns {{valid: boolean, error: string}}
*/
function validate (extension, name) {
'use strict';
var errMsg = (name) ? 'Error in ' + name + ' extension->' : 'Error in unnamed extension',
ret = {
valid: true,
error: ''
};
if (!showdown.helper.isArray(extension)) {
extension = [extension];
}
for (var i = 0; i < extension.length; ++i) {
var baseMsg = errMsg + ' sub-extension ' + i + ': ',
ext = extension[i];
if (typeof ext !== 'object') {
ret.valid = false;
ret.error = baseMsg + 'must be an object, but ' + typeof ext + ' given';
return ret;
}
if (!showdown.helper.isString(ext.type)) {
ret.valid = false;
ret.error = baseMsg + 'property "type" must be a string, but ' + typeof ext.type + ' given';
return ret;
}
var type = ext.type = ext.type.toLowerCase();
// normalize extension type
if (type === 'language') {
type = ext.type = 'lang';
}
if (type === 'html') {
type = ext.type = 'output';
}
if (type !== 'lang' && type !== 'output' && type !== 'listener') {
ret.valid = false;
ret.error = baseMsg + 'type ' + type + ' is not recognized. Valid values: "lang/language", "output/html" or "listener"';
return ret;
}
if (type === 'listener') {
if (showdown.helper.isUndefined(ext.listeners)) {
ret.valid = false;
ret.error = baseMsg + '. Extensions of type "listener" must have a property called "listeners"';
return ret;
}
} else {
if (showdown.helper.isUndefined(ext.filter) && showdown.helper.isUndefined(ext.regex)) {
ret.valid = false;
ret.error = baseMsg + type + ' extensions must define either a "regex" property or a "filter" method';
return ret;
}
}
if (ext.listeners) {
if (typeof ext.listeners !== 'object') {
ret.valid = false;
ret.error = baseMsg + '"listeners" property must be an object but ' + typeof ext.listeners + ' given';
return ret;
}
for (var ln in ext.listeners) {
if (ext.listeners.hasOwnProperty(ln)) {
if (typeof ext.listeners[ln] !== 'function') {
ret.valid = false;
ret.error = baseMsg + '"listeners" property must be an hash of [event name]: [callback]. listeners.' + ln +
' must be a function but ' + typeof ext.listeners[ln] + ' given';
return ret;
}
}
}
}
if (ext.filter) {
if (typeof ext.filter !== 'function') {
ret.valid = false;
ret.error = baseMsg + '"filter" must be a function, but ' + typeof ext.filter + ' given';
return ret;
}
} else if (ext.regex) {
if (showdown.helper.isString(ext.regex)) {
ext.regex = new RegExp(ext.regex, 'g');
}
if (!(ext.regex instanceof RegExp)) {
ret.valid = false;
ret.error = baseMsg + '"regex" property must either be a string or a RegExp object, but ' + typeof ext.regex + ' given';
return ret;
}
if (showdown.helper.isUndefined(ext.replace)) {
ret.valid = false;
ret.error = baseMsg + '"regex" extensions must implement a replace string or function';
return ret;
}
}
}
return ret;
}
/**
* Validate extension
* @param {object} ext
* @returns {boolean}
*/
showdown.validateExtension = function (ext) {
'use strict';
var validateExtension = validate(ext, null);
if (!validateExtension.valid) {
console.warn(validateExtension.error);
return false;
}
return true;
};
/**
* showdownjs helper functions
*/
if (!showdown.hasOwnProperty('helper')) {
showdown.helper = {};
}
if (typeof this === 'undefined' && typeof window !== 'undefined') {
showdown.helper.document = window.document;
} else {
if (typeof this.document === 'undefined' && typeof this.window === 'undefined') {
var jsdom = require('jsdom');
this.window = new jsdom.JSDOM('', {}).window; // jshint ignore:line
}
showdown.helper.document = this.window.document;
}
/**
* Check if var is string
* @static
* @param {string} a
* @returns {boolean}
*/
showdown.helper.isString = function (a) {
'use strict';
return (typeof a === 'string' || a instanceof String);
};
/**
* Check if var is a function
* @static
* @param {*} a
* @returns {boolean}
*/
showdown.helper.isFunction = function (a) {
'use strict';
var getType = {};
return a && getType.toString.call(a) === '[object Function]';
};
/**
* isArray helper function
* @static
* @param {*} a
* @returns {boolean}
*/
showdown.helper.isArray = function (a) {
'use strict';
return Array.isArray(a);
};
/**
* Check if value is undefined
* @static
* @param {*} value The value to check.
* @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
*/
showdown.helper.isUndefined = function (value) {
'use strict';
return typeof value === 'undefined';
};
/**
* ForEach helper function
* Iterates over Arrays and Objects (own properties only)
* @static
* @param {*} obj
* @param {function} callback Accepts 3 params: 1. value, 2. key, 3. the original array/object
*/
showdown.helper.forEach = function (obj, callback) {
'use strict';
// check if obj is defined
if (showdown.helper.isUndefined(obj)) {
throw new Error('obj param is required');
}
if (showdown.helper.isUndefined(callback)) {
throw new Error('callback param is required');
}
if (!showdown.helper.isFunction(callback)) {
throw new Error('callback param must be a function/closure');
}
if (typeof obj.forEach === 'function') {
obj.forEach(callback);
} else if (showdown.helper.isArray(obj)) {
for (var i = 0; i < obj.length; i++) {
callback(obj[i], i, obj);
}
} else if (typeof (obj) === 'object') {
for (var prop in obj) {
if (obj.hasOwnProperty(prop)) {
callback(obj[prop], prop, obj);
}
}
} else {
throw new Error('obj does not seem to be an array or an iterable object');
}
};
/**
* Standardidize extension name
* @static
* @param {string} s extension name
* @returns {string}
*/
showdown.helper.stdExtName = function (s) {
'use strict';
return s.replace(/[_?*+\/\\.^-]/g, '').replace(/\s/g, '').toLowerCase();
};
function escapeCharactersCallback (wholeMatch, m1) {
'use strict';
var charCodeToEscape = m1.charCodeAt(0);
return '¨E' + charCodeToEscape + 'E';
}
/**
* Callback used to escape characters when passing through String.replace
* @static
* @param {string} wholeMatch
* @param {string} m1
* @returns {string}
*/
showdown.helper.escapeCharactersCallback = escapeCharactersCallback;
/**
* Escape characters in a string
* @static
* @param {string} text
* @param {string} charsToEscape
* @param {boolean} afterBackslash
* @returns {string|void|*}
*/
showdown.helper.escapeCharacters = function (text, charsToEscape, afterBackslash) {
'use strict';
// First we have to escape the escape characters so that
// we can build a character class out of them
var regexString = '([' + charsToEscape.replace(/([\[\]\\])/g, '\\$1') + '])';
if (afterBackslash) {
regexString = '\\\\' + regexString;
}
var regex = new RegExp(regexString, 'g');
text = text.replace(regex, escapeCharactersCallback);
return text;
};
var rgxFindMatchPos = function (str, left, right, flags) {
'use strict';
var f = flags || '',
g = f.indexOf('g') > -1,
x = new RegExp(left + '|' + right, 'g' + f.replace(/g/g, '')),
l = new RegExp(left, f.replace(/g/g, '')),
pos = [],
t, s, m, start, end;
do {
t = 0;
while ((m = x.exec(str))) {
if (l.test(m[0])) {
if (!(t++)) {
s = x.lastIndex;
start = s - m[0].length;
}
} else if (t) {
if (!--t) {
end = m.index + m[0].length;
var obj = {
left: {start: start, end: s},
match: {start: s, end: m.index},
right: {start: m.index, end: end},
wholeMatch: {start: start, end: end}
};
pos.push(obj);
if (!g) {
return pos;
}
}
}
}
} while (t && (x.lastIndex = s));
return pos;
};
/**
* matchRecursiveRegExp
*
* (c) 2007 Steven Levithan <stevenlevithan.com>
* MIT License
*
* Accepts a string to search, a left and right format delimiter
* as regex patterns, and optional regex flags. Returns an array
* of matches, allowing nested instances of left/right delimiters.
* Use the "g" flag to return all matches, otherwise only the
* first is returned. Be careful to ensure that the left and
* right format delimiters produce mutually exclusive matches.
* Backreferences are not supported within the right delimiter
* due to how it is internally combined with the left delimiter.
* When matching strings whose format delimiters are unbalanced
* to the left or right, the output is intentionally as a
* conventional regex library with recursion support would
* produce, e.g. "<<x>" and "<x>>" both produce ["x"] when using
* "<" and ">" as the delimiters (both strings contain a single,
* balanced instance of "<x>").
*
* examples:
* matchRecursiveRegExp("test", "\\(", "\\)")
* returns: []
* matchRecursiveRegExp("<t<<e>><s>>t<>", "<", ">", "g")
* returns: ["t<<e>><s>", ""]
* matchRecursiveRegExp("<div id=\"x\">test</div>", "<div\\b[^>]*>", "</div>", "gi")
* returns: ["test"]
*/
showdown.helper.matchRecursiveRegExp = function (str, left, right, flags) {
'use strict';
var matchPos = rgxFindMatchPos (str, left, right, flags),
results = [];
for (var i = 0; i < matchPos.length; ++i) {
results.push([
str.slice(matchPos[i].wholeMatch.start, matchPos[i].wholeMatch.end),
str.slice(matchPos[i].match.start, matchPos[i].match.end),
str.slice(matchPos[i].left.start, matchPos[i].left.end),
str.slice(matchPos[i].right.start, matchPos[i].right.end)
]);
}
return results;
};
/**
*
* @param {string} str
* @param {string|function} replacement
* @param {string} left
* @param {string} right
* @param {string} flags
* @returns {string}
*/
showdown.helper.replaceRecursiveRegExp = function (str, replacement, left, right, flags) {
'use strict';
if (!showdown.helper.isFunction(replacement)) {
var repStr = replacement;
replacement = function () {
return repStr;
};
}
var matchPos = rgxFindMatchPos(str, left, right, flags),
finalStr = str,
lng = matchPos.length;
if (lng > 0) {
var bits = [];
if (matchPos[0].wholeMatch.start !== 0) {
bits.push(str.slice(0, matchPos[0].wholeMatch.start));
}
for (var i = 0; i < lng; ++i) {
bits.push(
replacement(
str.slice(matchPos[i].wholeMatch.start, matchPos[i].wholeMatch.end),
str.slice(matchPos[i].match.start, matchPos[i].match.end),
str.slice(matchPos[i].left.start, matchPos[i].left.end),
str.slice(matchPos[i].right.start, matchPos[i].right.end)
)
);
if (i < lng - 1) {
bits.push(str.slice(matchPos[i].wholeMatch.end, matchPos[i + 1].wholeMatch.start));
}
}
if (matchPos[lng - 1].wholeMatch.end < str.length) {
bits.push(str.slice(matchPos[lng - 1].wholeMatch.end));
}
finalStr = bits.join('');
}
return finalStr;
};
/**
* Returns the index within the passed String object of the first occurrence of the specified regex,
* starting the search at fromIndex. Returns -1 if the value is not found.
*
* @param {string} str string to search
* @param {RegExp} regex Regular expression to search
* @param {int} [fromIndex = 0] Index to start the search
* @returns {Number}
* @throws InvalidArgumentError
*/
showdown.helper.regexIndexOf = function (str, regex, fromIndex) {
'use strict';
if (!showdown.helper.isString(str)) {
throw 'InvalidArgumentError: first parameter of showdown.helper.regexIndexOf function must be a string';
}
if (!(regex instanceof RegExp)) {
throw 'InvalidArgumentError: second parameter of showdown.helper.regexIndexOf function must be an instance of RegExp';
}
var indexOf = str.substring(fromIndex || 0).search(regex);
return (indexOf >= 0) ? (indexOf + (fromIndex || 0)) : indexOf;
};
/**
* Splits the passed string object at the defined index, and returns an array composed of the two substrings
* @param {string} str string to split
* @param {int} index index to split string at
* @returns {[string,string]}
* @throws InvalidArgumentError
*/
showdown.helper.splitAtIndex = function (str, index) {
'use strict';
if (!showdown.helper.isString(str)) {
throw 'InvalidArgumentError: first parameter of showdown.helper.regexIndexOf function must be a string';
}
return [str.substring(0, index), str.substring(index)];
};
/**
* Obfuscate an e-mail address through the use of Character Entities,
* transforming ASCII characters into their equivalent decimal or hex entities.
*
* Since it has a random component, subsequent calls to this function produce different results
*
* @param {string} mail
* @param {string} seed
* @returns {string}
*/
showdown.helper.encodeEmailAddress = function (mail, seed) {
'use strict';
var encode = [
function (ch) {
return '&#' + ch.charCodeAt(0) + ';';
},
function (ch) {
return '&#x' + ch.charCodeAt(0).toString(16) + ';';
},
function (ch) {
return ch;
}
];
mail = mail.replace(/./g, function (ch) {
if (ch === '@') {
// this *must* be encoded. I insist.
ch = encode[Math.floor(Math.random() * 2)](ch);
} else {
var r = Math.random();
// roughly 10% raw, 45% hex, 45% dec
ch = (
r > 0.9 ? encode[2](ch) : r > 0.45 ? encode[1](ch) : encode[0](ch)
);
}
return ch;
});
return mail;
};
/**
* String.prototype.repeat polyfill
*
* @param {string} str
* @param {int} count
* @returns {string}
*/
showdown.helper.repeat = function (str, count) {
'use strict';
// use built-in method if it's available
if (!showdown.helper.isUndefined(String.prototype.repeat)) {
return str.repeat(count);
}
str = '' + str;
if (count < 0) {
throw new RangeError('repeat count must be non-negative');
}
if (count === Infinity) {
throw new RangeError('repeat count must be less than infinity');
}
count = Math.floor(count);
if (str.length === 0 || count === 0) {
return '';
}
// Ensuring count is a 31-bit integer allows us to heavily optimize the
// main part. But anyway, most current (August 2014) browsers can't handle
// strings 1 << 28 chars or longer, so:
/*jshint bitwise: false*/
if (str.length * count >= 1 << 28) {
throw new RangeError('repeat count must not overflow maximum string size');
}
/*jshint bitwise: true*/
var maxCount = str.length * count;
count = Math.floor(Math.log(count) / Math.log(2));
while (count) {
str += str;
count--;
}
str += str.substring(0, maxCount - str.length);
return str;
};
/**
* String.prototype.padEnd polyfill
*
* @param str
* @param targetLength
* @param padString
* @returns {string}
*/
showdown.helper.padEnd = function padEnd (str, targetLength, padString) {
'use strict';