78 lines
2.4 KiB
JavaScript
78 lines
2.4 KiB
JavaScript
var Marker = require('../../tokenizer/marker');
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var Selector = {
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ADJACENT_SIBLING: '+',
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DESCENDANT: '>',
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DOT: '.',
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HASH: '#',
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NON_ADJACENT_SIBLING: '~',
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PSEUDO: ':'
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};
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var LETTER_PATTERN = /[a-zA-Z]/;
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var NOT_PREFIX = ':not(';
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var SEPARATOR_PATTERN = /[\s,(>~+]/;
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function specificity(selector) {
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var result = [0, 0, 0];
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var character;
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var isEscaped;
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var isSingleQuoted;
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var isDoubleQuoted;
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var roundBracketLevel = 0;
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var couldIntroduceNewTypeSelector;
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var withinNotPseudoClass = false;
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var wasPseudoClass = false;
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var i, l;
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for (i = 0, l = selector.length; i < l; i++) {
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character = selector[i];
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if (isEscaped) {
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// noop
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} else if (character == Marker.SINGLE_QUOTE && !isDoubleQuoted && !isSingleQuoted) {
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isSingleQuoted = true;
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} else if (character == Marker.SINGLE_QUOTE && !isDoubleQuoted && isSingleQuoted) {
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isSingleQuoted = false;
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} else if (character == Marker.DOUBLE_QUOTE && !isDoubleQuoted && !isSingleQuoted) {
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isDoubleQuoted = true;
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} else if (character == Marker.DOUBLE_QUOTE && isDoubleQuoted && !isSingleQuoted) {
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isDoubleQuoted = false;
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} else if (isSingleQuoted || isDoubleQuoted) {
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continue;
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} else if (roundBracketLevel > 0 && !withinNotPseudoClass) {
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// noop
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} else if (character == Marker.OPEN_ROUND_BRACKET) {
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roundBracketLevel++;
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} else if (character == Marker.CLOSE_ROUND_BRACKET && roundBracketLevel == 1) {
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roundBracketLevel--;
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withinNotPseudoClass = false;
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} else if (character == Marker.CLOSE_ROUND_BRACKET) {
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roundBracketLevel--;
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} else if (character == Selector.HASH) {
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result[0]++;
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} else if (character == Selector.DOT || character == Marker.OPEN_SQUARE_BRACKET) {
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result[1]++;
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} else if (character == Selector.PSEUDO && !wasPseudoClass && !isNotPseudoClass(selector, i)) {
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result[1]++;
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withinNotPseudoClass = false;
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} else if (character == Selector.PSEUDO) {
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withinNotPseudoClass = true;
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} else if ((i === 0 || couldIntroduceNewTypeSelector) && LETTER_PATTERN.test(character)) {
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result[2]++;
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}
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isEscaped = character == Marker.BACK_SLASH;
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wasPseudoClass = character == Selector.PSEUDO;
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couldIntroduceNewTypeSelector = !isEscaped && SEPARATOR_PATTERN.test(character);
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}
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return result;
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}
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function isNotPseudoClass(selector, index) {
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return selector.indexOf(NOT_PREFIX, index) === index;
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}
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module.exports = specificity;
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