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index.js
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index.js
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'use strict';
const _ = require('lodash');
const beforeBlockString = require('../../utils/beforeBlockString');
const blockString = require('../../utils/blockString');
const hasBlock = require('../../utils/hasBlock');
const hasEmptyBlock = require('../../utils/hasEmptyBlock');
const optionsMatches = require('../../utils/optionsMatches');
const report = require('../../utils/report');
const ruleMessages = require('../../utils/ruleMessages');
const validateOptions = require('../../utils/validateOptions');
const whitespaceChecker = require('../../utils/whitespaceChecker');
const ruleName = 'block-opening-brace-space-before';
const messages = ruleMessages(ruleName, {
expectedBefore: () => 'Expected single space before "{"',
rejectedBefore: () => 'Unexpected whitespace before "{"',
expectedBeforeSingleLine: () => 'Expected single space before "{" of a single-line block',
rejectedBeforeSingleLine: () => 'Unexpected whitespace before "{" of a single-line block',
expectedBeforeMultiLine: () => 'Expected single space before "{" of a multi-line block',
rejectedBeforeMultiLine: () => 'Unexpected whitespace before "{" of a multi-line block',
});
function rule(expectation, options, context) {
const checker = whitespaceChecker('space', expectation, messages);
return (root, result) => {
const validOptions = validateOptions(
result,
ruleName,
{
actual: expectation,
possible: [
'always',
'never',
'always-single-line',
'never-single-line',
'always-multi-line',
'never-multi-line',
],
},
{
actual: options,
possible: {
ignoreAtRules: [_.isString, _.isRegExp],
ignoreSelectors: [_.isString, _.isRegExp],
},
optional: true,
},
);
if (!validOptions) {
return;
}
// Check both kinds of statements: rules and at-rules
root.walkRules(check);
root.walkAtRules(check);
function check(statement) {
// Return early if blockless or has an empty block
if (!hasBlock(statement) || hasEmptyBlock(statement)) {
return;
}
// Return early if at-rule is to be ignored
if (optionsMatches(options, 'ignoreAtRules', statement.name)) {
return;
}
// Return early if selector is to be ignored
if (optionsMatches(options, 'ignoreSelectors', statement.selector)) {
return;
}
const source = beforeBlockString(statement);
const beforeBraceNoRaw = beforeBlockString(statement, {
noRawBefore: true,
});
let index = beforeBraceNoRaw.length - 1;
if (beforeBraceNoRaw[index - 1] === '\r') {
index -= 1;
}
checker.before({
source,
index: source.length,
lineCheckStr: blockString(statement),
err: (m) => {
if (context.fix) {
if (expectation.startsWith('always')) {
statement.raws.between = ' ';
return;
}
if (expectation.startsWith('never')) {
statement.raws.between = '';
return;
}
}
report({
message: m,
node: statement,
index,
result,
ruleName,
});
},
});
}
};
}
rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;