/
index.js
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/
index.js
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// @ts-nocheck
'use strict';
const declarationValueIndex = require('../../utils/declarationValueIndex');
const report = require('../../utils/report');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const valueParser = require('postcss-value-parser');
const ruleName = 'color-hex-alpha';
const messages = ruleMessages(ruleName, {
expected: (hex) => `Expected alpha channel in "${hex}"`,
unexpected: (hex) => `Unexpected alpha channel in "${hex}"`,
});
const HEX = /^#([\da-f]{3,4}|[\da-f]{6}|[\da-f]{8})$/i;
function rule(primary) {
return (root, result) => {
const validOptions = validateOptions(result, ruleName, {
actual: primary,
possible: ['always', 'never'],
});
if (!validOptions) return;
root.walkDecls((decl) => {
const parsedValue = valueParser(decl.value);
parsedValue.walk((node) => {
if (isUrlFunction(node)) return false;
if (!isHexColor(node)) return;
const { value } = node;
if (primary === 'always' && hasAlphaChannel(value)) return;
if (primary === 'never' && !hasAlphaChannel(value)) return;
report({
message: primary === 'never' ? messages.unexpected(value) : messages.expected(value),
node: decl,
index: declarationValueIndex(decl) + node.sourceIndex,
result,
ruleName,
});
});
});
};
}
function isUrlFunction({ type, value }) {
return type === 'function' && value === 'url';
}
function isHexColor({ type, value }) {
return type === 'word' && HEX.test(value);
}
function hasAlphaChannel(hex) {
return hex.length === 5 || hex.length === 9;
}
rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;