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utils.js
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utils.js
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/**
* @typedef {import('.').Token} Token
* @typedef {import('.').Options} Options
* @typedef {import('.').AttributePair} AttributePair
* @typedef {import('.').AllowedAttribute} AllowedAttribute
* @typedef {import('.').DetectingStrRule} DetectingStrRule
*/
/**
* parse {.class #id key=val} strings
* @param {string} str: string to parse
* @param {number} start: where to start parsing (including {)
* @param {Options} options
* @returns {AttributePair[]}: [['key', 'val'], ['class', 'red']]
*/
exports.getAttrs = function (str, start, options) {
// not tab, line feed, form feed, space, solidus, greater than sign, quotation mark, apostrophe and equals sign
const allowedKeyChars = /[^\t\n\f />"'=]/;
const pairSeparator = ' ';
const keySeparator = '=';
const classChar = '.';
const idChar = '#';
const attrs = [];
let key = '';
let value = '';
let parsingKey = true;
let valueInsideQuotes = false;
// read inside {}
// start + left delimiter length to avoid beginning {
// breaks when } is found or end of string
for (let i = start + options.leftDelimiter.length; i < str.length; i++) {
if (str.slice(i, i + options.rightDelimiter.length) === options.rightDelimiter) {
if (key !== '') { attrs.push([key, value]); }
break;
}
const char_ = str.charAt(i);
// switch to reading value if equal sign
if (char_ === keySeparator && parsingKey) {
parsingKey = false;
continue;
}
// {.class} {..css-module}
if (char_ === classChar && key === '') {
if (str.charAt(i + 1) === classChar) {
key = 'css-module';
i += 1;
} else {
key = 'class';
}
parsingKey = false;
continue;
}
// {#id}
if (char_ === idChar && key === '') {
key = 'id';
parsingKey = false;
continue;
}
// {value="inside quotes"}
if (char_ === '"' && value === '' && !valueInsideQuotes) {
valueInsideQuotes = true;
continue;
}
if (char_ === '"' && valueInsideQuotes) {
valueInsideQuotes = false;
continue;
}
// read next key/value pair
if ((char_ === pairSeparator && !valueInsideQuotes)) {
if (key === '') {
// beginning or ending space: { .red } vs {.red}
continue;
}
attrs.push([key, value]);
key = '';
value = '';
parsingKey = true;
continue;
}
// continue if character not allowed
if (parsingKey && char_.search(allowedKeyChars) === -1) {
continue;
}
// no other conditions met; append to key/value
if (parsingKey) {
key += char_;
continue;
}
value += char_;
}
if (options.allowedAttributes && options.allowedAttributes.length) {
const allowedAttributes = options.allowedAttributes;
return attrs.filter(function (attrPair) {
const attr = attrPair[0];
/**
* @param {AllowedAttribute} allowedAttribute
*/
function isAllowedAttribute (allowedAttribute) {
return (attr === allowedAttribute
|| (allowedAttribute instanceof RegExp && allowedAttribute.test(attr))
);
}
return allowedAttributes.some(isAllowedAttribute);
});
}
return attrs;
};
/**
* add attributes from [['key', 'val']] list
* @param {AttributePair[]} attrs: [['key', 'val']]
* @param {Token} token: which token to add attributes
* @returns token
*/
exports.addAttrs = function (attrs, token) {
for (let j = 0, l = attrs.length; j < l; ++j) {
const key = attrs[j][0];
if (key === 'class') {
token.attrJoin('class', attrs[j][1]);
} else if (key === 'css-module') {
token.attrJoin('css-module', attrs[j][1]);
} else {
token.attrPush(attrs[j]);
}
}
return token;
};
/**
* Does string have properly formatted curly?
*
* start: '{.a} asdf'
* end: 'asdf {.a}'
* only: '{.a}'
*
* @param {'start'|'end'|'only'} where to expect {} curly. start, end or only.
* @param {Options} options
* @return {DetectingStrRule} Function which testes if string has curly.
*/
exports.hasDelimiters = function (where, options) {
if (!where) {
throw new Error('Parameter `where` not passed. Should be "start", "end" or "only".');
}
/**
* @param {string} str
* @return {boolean}
*/
return function (str) {
// we need minimum three chars, for example {b}
const minCurlyLength = options.leftDelimiter.length + 1 + options.rightDelimiter.length;
if (!str || typeof str !== 'string' || str.length < minCurlyLength) {
return false;
}
/**
* @param {string} curly
*/
function validCurlyLength (curly) {
const isClass = curly.charAt(options.leftDelimiter.length) === '.';
const isId = curly.charAt(options.leftDelimiter.length) === '#';
return (isClass || isId)
? curly.length >= (minCurlyLength + 1)
: curly.length >= minCurlyLength;
}
let start, end, slice, nextChar;
const rightDelimiterMinimumShift = minCurlyLength - options.rightDelimiter.length;
switch (where) {
case 'start':
// first char should be {, } found in char 2 or more
slice = str.slice(0, options.leftDelimiter.length);
start = slice === options.leftDelimiter ? 0 : -1;
end = start === -1 ? -1 : str.indexOf(options.rightDelimiter, rightDelimiterMinimumShift);
// check if next character is not one of the delimiters
nextChar = str.charAt(end + options.rightDelimiter.length);
if (nextChar && options.rightDelimiter.indexOf(nextChar) !== -1) {
end = -1;
}
break;
case 'end':
// last char should be }
start = str.lastIndexOf(options.leftDelimiter);
end = start === -1 ? -1 : str.indexOf(options.rightDelimiter, start + rightDelimiterMinimumShift);
end = end === str.length - options.rightDelimiter.length ? end : -1;
break;
case 'only':
// '{.a}'
slice = str.slice(0, options.leftDelimiter.length);
start = slice === options.leftDelimiter ? 0 : -1;
slice = str.slice(str.length - options.rightDelimiter.length);
end = slice === options.rightDelimiter ? str.length - options.rightDelimiter.length : -1;
break;
default:
throw new Error(`Unexpected case ${where}, expected 'start', 'end' or 'only'`);
}
return start !== -1 && end !== -1 && validCurlyLength(str.substring(start, end + options.rightDelimiter.length));
};
};
/**
* Removes last curly from string.
* @param {string} str
* @param {Options} options
*/
exports.removeDelimiter = function (str, options) {
const start = escapeRegExp(options.leftDelimiter);
const end = escapeRegExp(options.rightDelimiter);
const curly = new RegExp(
'[ \\n]?' + start + '[^' + start + end + ']+' + end + '$'
);
const pos = str.search(curly);
return pos !== -1 ? str.slice(0, pos) : str;
};
/**
* Escapes special characters in string s such that the string
* can be used in `new RegExp`. For example "[" becomes "\\[".
*
* @param {string} s Regex string.
* @return {string} Escaped string.
*/
function escapeRegExp (s) {
return s.replace(/[-/\\^$*+?.()|[\]{}]/g, '\\$&');
}
exports.escapeRegExp = escapeRegExp;
/**
* find corresponding opening block
* @param {Token[]} tokens
* @param {number} i
*/
exports.getMatchingOpeningToken = function (tokens, i) {
if (tokens[i].type === 'softbreak') {
return false;
}
// non closing blocks, example img
if (tokens[i].nesting === 0) {
return tokens[i];
}
const level = tokens[i].level;
const type = tokens[i].type.replace('_close', '_open');
for (; i >= 0; --i) {
if (tokens[i].type === type && tokens[i].level === level) {
return tokens[i];
}
}
return false;
};
/**
* from https://github.com/markdown-it/markdown-it/blob/master/lib/common/utils.js
*/
const HTML_ESCAPE_TEST_RE = /[&<>"]/;
const HTML_ESCAPE_REPLACE_RE = /[&<>"]/g;
const HTML_REPLACEMENTS = {
'&': '&',
'<': '<',
'>': '>',
'"': '"'
};
/**
* @param {string} ch
* @returns {string}
*/
function replaceUnsafeChar(ch) {
return HTML_REPLACEMENTS[ch];
}
/**
* @param {string} str
* @returns {string}
*/
exports.escapeHtml = function (str) {
if (HTML_ESCAPE_TEST_RE.test(str)) {
return str.replace(HTML_ESCAPE_REPLACE_RE, replaceUnsafeChar);
}
return str;
};