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'use strict';
const report = require('../../utils/report');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const ruleName = 'unicode-bom';
const messages = ruleMessages(ruleName, {
expected: 'Expected Unicode BOM',
rejected: 'Unexpected Unicode BOM',
});
function rule(expectation) {
return (root, result) => {
const validOptions = validateOptions(result, ruleName, {
actual: expectation,
possible: ['always', 'never'],
});
if (
!validOptions ||
root.source.inline ||
root.source.lang === 'object-literal' ||
// Ignore HTML documents
root.document !== undefined
) {
return;
}
const { hasBOM } = root.source.input;
if (expectation === 'always' && !hasBOM) {
report({
result,
ruleName,
message: messages.expected,
root,
line: 1,
});
}
if (expectation === 'never' && hasBOM) {
report({
result,
ruleName,
message: messages.rejected,
root,
line: 1,
});
}
};
}
rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;
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