lix-website/themes/lix/assets/bootstrap/node_modules/specificity/dist/specificity.js

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2024-04-27 03:39:10 +00:00
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
typeof define === 'function' && define.amd ? define(['exports'], factory) :
(factory((global.SPECIFICITY = {})));
}(this, (function (exports) { 'use strict';
// Calculate the specificity for a selector by dividing it into simple selectors and counting them
var calculate = function(input) {
var selectors,
selector,
i,
len,
results = [];
// Separate input by commas
selectors = input.split(',');
for (i = 0, len = selectors.length; i < len; i += 1) {
selector = selectors[i];
if (selector.length > 0) {
results.push(calculateSingle(selector));
}
}
return results;
};
/**
* Calculates the specificity of CSS selectors
* http://www.w3.org/TR/css3-selectors/#specificity
*
* Returns an object with the following properties:
* - selector: the input
* - specificity: e.g. 0,1,0,0
* - parts: array with details about each part of the selector that counts towards the specificity
* - specificityArray: e.g. [0, 1, 0, 0]
*/
var calculateSingle = function(input) {
var selector = input,
findMatch,
typeCount = {
'a': 0,
'b': 0,
'c': 0
},
parts = [],
// The following regular expressions assume that selectors matching the preceding regular expressions have been removed
attributeRegex = /(\[[^\]]+\])/g,
idRegex = /(#[^\#\s\+>~\.\[:\)]+)/g,
classRegex = /(\.[^\s\+>~\.\[:\)]+)/g,
pseudoElementRegex = /(::[^\s\+>~\.\[:]+|:first-line|:first-letter|:before|:after)/gi,
// A regex for pseudo classes with brackets - :nth-child(), :nth-last-child(), :nth-of-type(), :nth-last-type(), :lang()
// The negation psuedo class (:not) is filtered out because specificity is calculated on its argument
// :global and :local are filtered out - they look like psuedo classes but are an identifier for CSS Modules
pseudoClassWithBracketsRegex = /(:(?!not|global|local)[\w-]+\([^\)]*\))/gi,
// A regex for other pseudo classes, which don't have brackets
pseudoClassRegex = /(:(?!not|global|local)[^\s\+>~\.\[:]+)/g,
elementRegex = /([^\s\+>~\.\[:]+)/g;
// Find matches for a regular expression in a string and push their details to parts
// Type is "a" for IDs, "b" for classes, attributes and pseudo-classes and "c" for elements and pseudo-elements
findMatch = function(regex, type) {
var matches, i, len, match, index, length;
if (regex.test(selector)) {
matches = selector.match(regex);
for (i = 0, len = matches.length; i < len; i += 1) {
typeCount[type] += 1;
match = matches[i];
index = selector.indexOf(match);
length = match.length;
parts.push({
selector: input.substr(index, length),
type: type,
index: index,
length: length
});
// Replace this simple selector with whitespace so it won't be counted in further simple selectors
selector = selector.replace(match, Array(length + 1).join(' '));
}
}
};
// Replace escaped characters with plain text, using the "A" character
// https://www.w3.org/TR/CSS21/syndata.html#characters
(function() {
var replaceWithPlainText = function(regex) {
var matches, i, len, match;
if (regex.test(selector)) {
matches = selector.match(regex);
for (i = 0, len = matches.length; i < len; i += 1) {
match = matches[i];
selector = selector.replace(match, Array(match.length + 1).join('A'));
}
}
},
// Matches a backslash followed by six hexadecimal digits followed by an optional single whitespace character
escapeHexadecimalRegex = /\\[0-9A-Fa-f]{6}\s?/g,
// Matches a backslash followed by fewer than six hexadecimal digits followed by a mandatory single whitespace character
escapeHexadecimalRegex2 = /\\[0-9A-Fa-f]{1,5}\s/g,
// Matches a backslash followed by any character
escapeSpecialCharacter = /\\./g;
replaceWithPlainText(escapeHexadecimalRegex);
replaceWithPlainText(escapeHexadecimalRegex2);
replaceWithPlainText(escapeSpecialCharacter);
}());
// Remove anything after a left brace in case a user has pasted in a rule, not just a selector
(function() {
var regex = /{[^]*/gm,
matches, i, len, match;
if (regex.test(selector)) {
matches = selector.match(regex);
for (i = 0, len = matches.length; i < len; i += 1) {
match = matches[i];
selector = selector.replace(match, Array(match.length + 1).join(' '));
}
}
}());
// Add attribute selectors to parts collection (type b)
findMatch(attributeRegex, 'b');
// Add ID selectors to parts collection (type a)
findMatch(idRegex, 'a');
// Add class selectors to parts collection (type b)
findMatch(classRegex, 'b');
// Add pseudo-element selectors to parts collection (type c)
findMatch(pseudoElementRegex, 'c');
// Add pseudo-class selectors to parts collection (type b)
findMatch(pseudoClassWithBracketsRegex, 'b');
findMatch(pseudoClassRegex, 'b');
// Remove universal selector and separator characters
selector = selector.replace(/[\*\s\+>~]/g, ' ');
// Remove any stray dots or hashes which aren't attached to words
// These may be present if the user is live-editing this selector
selector = selector.replace(/[#\.]/g, ' ');
// Remove the negation psuedo-class (:not) but leave its argument because specificity is calculated on its argument
// Remove non-standard :local and :global CSS Module identifiers because they do not effect the specificity
selector = selector.replace(/:not/g, ' ');
selector = selector.replace(/:local/g, ' ');
selector = selector.replace(/:global/g, ' ');
selector = selector.replace(/[\(\)]/g, ' ');
// The only things left should be element selectors (type c)
findMatch(elementRegex, 'c');
// Order the parts in the order they appear in the original selector
// This is neater for external apps to deal with
parts.sort(function(a, b) {
return a.index - b.index;
});
return {
selector: input,
specificity: '0,' + typeCount.a.toString() + ',' + typeCount.b.toString() + ',' + typeCount.c.toString(),
specificityArray: [0, typeCount.a, typeCount.b, typeCount.c],
parts: parts
};
};
/**
* Compares two CSS selectors for specificity
* Alternatively you can replace one of the CSS selectors with a specificity array
*
* - it returns -1 if a has a lower specificity than b
* - it returns 1 if a has a higher specificity than b
* - it returns 0 if a has the same specificity than b
*/
var compare = function(a, b) {
var aSpecificity,
bSpecificity,
i;
if (typeof a ==='string') {
if (a.indexOf(',') !== -1) {
throw 'Invalid CSS selector';
} else {
aSpecificity = calculateSingle(a)['specificityArray'];
}
} else if (Array.isArray(a)) {
if (a.filter(function(e) { return (typeof e === 'number'); }).length !== 4) {
throw 'Invalid specificity array';
} else {
aSpecificity = a;
}
} else {
throw 'Invalid CSS selector or specificity array';
}
if (typeof b ==='string') {
if (b.indexOf(',') !== -1) {
throw 'Invalid CSS selector';
} else {
bSpecificity = calculateSingle(b)['specificityArray'];
}
} else if (Array.isArray(b)) {
if (b.filter(function(e) { return (typeof e === 'number'); }).length !== 4) {
throw 'Invalid specificity array';
} else {
bSpecificity = b;
}
} else {
throw 'Invalid CSS selector or specificity array';
}
for (i = 0; i < 4; i += 1) {
if (aSpecificity[i] < bSpecificity[i]) {
return -1;
} else if (aSpecificity[i] > bSpecificity[i]) {
return 1;
}
}
return 0;
};
exports.calculate = calculate;
exports.compare = compare;
Object.defineProperty(exports, '__esModule', { value: true });
})));