forked from stylelint/stylelint
/
index.js
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/
index.js
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'use strict';
const _ = require('lodash');
const isKeyframeSelector = require('../../utils/isKeyframeSelector');
const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
const isStandardSyntaxSelector = require('../../utils/isStandardSyntaxSelector');
const parseSelector = require('../../utils/parseSelector');
const report = require('../../utils/report');
const resolveNestedSelector = require('postcss-resolve-nested-selector');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const ruleName = 'selector-class-pattern';
const messages = ruleMessages(ruleName, {
expected: (selectorValue) =>
`Expected class selector ".${selectorValue}" to match specified pattern`,
});
const rule = function(pattern, options) {
return (root, result) => {
const validOptions = validateOptions(
result,
ruleName,
{
actual: pattern,
possible: [_.isRegExp, _.isString],
},
{
actual: options,
possible: {
resolveNestedSelectors: _.isBoolean,
},
optional: true,
},
);
if (!validOptions) {
return;
}
const shouldResolveNestedSelectors = _.get(options, 'resolveNestedSelectors');
const normalizedPattern = _.isString(pattern) ? new RegExp(pattern) : pattern;
root.walkRules((rule) => {
const selector = rule.selector;
const selectors = rule.selectors;
if (!isStandardSyntaxRule(rule)) {
return;
}
if (selectors.some((s) => isKeyframeSelector(s))) {
return;
}
// Only bother resolving selectors that have an interpolating &
if (shouldResolveNestedSelectors && hasInterpolatingAmpersand(selector)) {
resolveNestedSelector(selector, rule).forEach((selector) => {
if (!isStandardSyntaxSelector(selector)) {
return;
}
parseSelector(selector, result, rule, (s) => checkSelector(s, rule));
});
} else {
parseSelector(selector, result, rule, (s) => checkSelector(s, rule));
}
});
function checkSelector(fullSelector, rule) {
fullSelector.walkClasses((classNode) => {
const value = classNode.value;
const sourceIndex = classNode.sourceIndex;
if (normalizedPattern.test(value)) {
return;
}
report({
result,
ruleName,
message: messages.expected(value),
node: rule,
index: sourceIndex,
});
});
}
};
};
// An "interpolating ampersand" means an "&" used to interpolate
// within another simple selector, rather than an "&" that
// stands on its own as a simple selector
function hasInterpolatingAmpersand(selector) {
for (let i = 0, l = selector.length; i < l; i++) {
if (selector[i] !== '&') {
continue;
}
if (selector[i - 1] !== undefined && !isCombinator(selector[i - 1])) {
return true;
}
if (selector[i + 1] !== undefined && !isCombinator(selector[i + 1])) {
return true;
}
}
return false;
}
function isCombinator(x) {
return /[\s+>~]/.test(x);
}
rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;