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# block-opening-brace-newline-before
Require a newline or disallow whitespace before the opening brace of blocks.
<!-- prettier-ignore -->
```css
a
{ color: pink; }
/** ↑
* The newline before this brace */
```
Refer to [combining rules](../../../docs/user-guide/rules/combine.md) for more information on using this rule with [`block-opening-brace-newline-after`](../block-opening-brace-newline-after/README.md) to disallow single-line rules.
The [`fix` option](../../../docs/user-guide/usage/options.md#fix) can automatically fix all of the problems reported by this rule.
## Options
`string`: `"always"|"always-single-line"|"never-single-line"|"always-multi-line"|"never-multi-line"`
### `"always"`
There _must always_ be a newline before the opening brace.
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a{ color: pink; }
```
<!-- prettier-ignore -->
```css
a{ color: pink;
}
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a
{ color: pink; }
```
<!-- prettier-ignore -->
```css
a
{
color: pink; }
```
<!-- prettier-ignore -->
```css
a /* foo */
{
color: pink;
}
```
### `"always-single-line"`
There _must always_ be a newline before the opening brace in single-line blocks.
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a{ color: pink; }
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a
{ color: pink; }
```
<!-- prettier-ignore -->
```css
a{
color: pink; }
```
### `"never-single-line"`
There _must never_ be whitespace before the opening brace in single-line blocks.
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a { color: pink; }
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a{ color: pink; }
```
<!-- prettier-ignore -->
```css
a {
color: pink; }
```
### `"always-multi-line"`
There _must always_ be a newline before the opening brace in multi-line blocks.
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a{
color: pink; }
```
<!-- prettier-ignore -->
```css
a {
color: pink; }
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a{ color: pink; }
```
<!-- prettier-ignore -->
```css
a { color: pink; }
```
<!-- prettier-ignore -->
```css
a
{ color: pink; }
```
<!-- prettier-ignore -->
```css
a
{
color: pink; }
```
### `"never-multi-line"`
There _must never_ be whitespace before the opening brace in multi-line blocks.
The following patterns are considered violations:
<!-- prettier-ignore -->
```css
a {
color: pink; }
```
The following patterns are _not_ considered violations:
<!-- prettier-ignore -->
```css
a { color: pink; }
```
<!-- prettier-ignore -->
```css
a{
color: pink;}
```
@@ -0,0 +1,107 @@
// @ts-nocheck
'use strict';
const beforeBlockString = require('../../utils/beforeBlockString');
const blockString = require('../../utils/blockString');
const hasBlock = require('../../utils/hasBlock');
const hasEmptyBlock = require('../../utils/hasEmptyBlock');
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-newline-before';
const messages = ruleMessages(ruleName, {
expectedBefore: () => 'Expected newline before "{"',
expectedBeforeSingleLine: () => 'Expected newline before "{" of a single-line block',
rejectedBeforeSingleLine: () => 'Unexpected whitespace before "{" of a single-line block',
expectedBeforeMultiLine: () => 'Expected newline before "{" of a multi-line block',
rejectedBeforeMultiLine: () => 'Unexpected whitespace before "{" of a multi-line block',
});
function rule(expectation, options, context) {
const checker = whitespaceChecker('newline', expectation, messages);
return (root, result) => {
const validOptions = validateOptions(result, ruleName, {
actual: expectation,
possible: [
'always',
'always-single-line',
'never-single-line',
'always-multi-line',
'never-multi-line',
],
});
if (!validOptions) {
return;
}
// Check both kinds of statement: 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;
}
const source = beforeBlockString(statement);
const beforeBraceNoRaw = beforeBlockString(statement, {
noRawBefore: true,
});
let index = beforeBraceNoRaw.length - 1;
if (beforeBraceNoRaw[index - 1] === '\r') {
index -= 1;
}
checker.beforeAllowingIndentation({
lineCheckStr: blockString(statement),
source,
index: source.length,
err: (m) => {
if (context.fix) {
if (expectation.startsWith('always')) {
const spaceIndex = statement.raws.between.search(/\s+$/);
if (spaceIndex >= 0) {
statement.raws.between =
statement.raws.between.slice(0, spaceIndex) +
context.newline +
statement.raws.between.slice(spaceIndex);
} else {
statement.raws.between += context.newline;
}
return;
}
if (expectation.startsWith('never')) {
statement.raws.between = statement.raws.between.replace(/\s*$/, '');
return;
}
}
report({
message: m,
node: statement,
index,
result,
ruleName,
});
},
});
}
};
}
rule.ruleName = ruleName;
rule.messages = messages;
module.exports = rule;