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fixes jsx-eslint#1493
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# Enforce linebreaks in curly braces in JSX attributes and expressions. (react/jsx-curly-newline) | ||
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Many style guides require or disallow newlines inside of jsx curly expressions. | ||
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**Fixable:** This rule is automatically fixable using the `--fix` flag on the command line. | ||
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## Rule Details | ||
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This rule enforces consistent linebreaks inside of curlies of jsx curly expressions. | ||
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## Rule Options | ||
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This rule has a string option: | ||
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* `consistent` enforces either both of linebreaks around curlies are present, or none are present. | ||
* `multiline` enforces that when the contained expression spans multiple line, require both linebreaks. When the contained expression is single line, disallow both line breaks. | ||
* `multiline-lax` (default) enforces that when the contained expression spans multiple line, require both linebreaks. When the contained expression is single line, disallow inconsistent line break. | ||
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### consistent | ||
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When `consistent` is set, the following patterns are considered warnings: | ||
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```jsx | ||
<div> | ||
{ foo | ||
} | ||
</div> | ||
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<div> | ||
{ | ||
foo } | ||
</div> | ||
``` | ||
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The following patterns are **not** warnings: | ||
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```jsx | ||
<div> | ||
{ foo } | ||
</div> | ||
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<div> | ||
{ | ||
foo | ||
} | ||
</div> | ||
``` | ||
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### multiline | ||
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When `multiline` is set, the following patterns are considered warnings: | ||
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```jsx | ||
<div> | ||
{ foo && | ||
foo.bar } | ||
</div> | ||
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<div> | ||
{ | ||
foo | ||
} | ||
</div> | ||
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<div> | ||
{ foo | ||
} | ||
</div> | ||
``` | ||
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The following patterns are **not** warnings: | ||
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```jsx | ||
<div> | ||
{ | ||
foo && | ||
foo.bar | ||
} | ||
</div> | ||
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<div> | ||
{ foo } | ||
</div> | ||
``` | ||
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### multiline-lax | ||
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When `multiline-lax` (default) is set, the following patterns are considered warnings: | ||
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```jsx | ||
<div> | ||
{ foo && | ||
foo.bar } | ||
</div> | ||
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<div> | ||
{ foo | ||
} | ||
</div> | ||
``` | ||
The following patterns are **not** warnings: | ||
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```jsx | ||
<div> | ||
{ | ||
foo && | ||
foo.bar | ||
} | ||
</div> | ||
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<div> | ||
{ | ||
foo | ||
} | ||
</div> | ||
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<div> | ||
{ foo } | ||
</div> | ||
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``` | ||
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## When Not To Use It | ||
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You can turn this rule off if you are not concerned with the consistency around the linebreaks inside of JSX attributes or expressions. |
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/** | ||
* @fileoverview enforce consistent line breaks inside jsx curly | ||
*/ | ||
'use strict'; | ||
const docsUrl = require('../util/docsUrl'); | ||
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// ------------------------------------------------------------------------------ | ||
// Rule Definition | ||
// ------------------------------------------------------------------------------ | ||
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module.exports = { | ||
meta: { | ||
type: 'layout', | ||
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docs: { | ||
description: 'enforce consistent line breaks inside jsx curly', | ||
category: 'Stylistic Issues', | ||
recommended: false, | ||
url: docsUrl('jsx-curly-newline') | ||
}, | ||
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fixable: 'whitespace', | ||
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schema: [ | ||
{ | ||
enum: ['consistent', 'multiline', 'multiline-lax'] | ||
} | ||
], | ||
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messages: { | ||
expectedBefore: 'Expected newline before \'}\'.', | ||
expectedAfter: 'Expected newline after \'{\'.', | ||
unexpectedBefore: 'Unexpected newline before \'{\'.', | ||
unexpectedAfter: 'Unexpected newline after \'}\'.' | ||
} | ||
}, | ||
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create(context) { | ||
const sourceCode = context.getSourceCode(); | ||
const rawOption = context.options[0] || 'multiline-lax'; | ||
const multilineOption = rawOption === 'multiline'; | ||
const multilineLaxOption = rawOption === 'multiline-lax'; | ||
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// ---------------------------------------------------------------------- | ||
// Helpers | ||
// ---------------------------------------------------------------------- | ||
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/** | ||
* Determines whether two adjacent tokens are on the same line. | ||
* @param {Object} left - The left token object. | ||
* @param {Object} right - The right token object. | ||
* @returns {boolean} Whether or not the tokens are on the same line. | ||
*/ | ||
function isTokenOnSameLine(left, right) { | ||
return left.loc.end.line === right.loc.start.line; | ||
} | ||
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/** | ||
* Determines whether there should be newlines inside curlys | ||
* @param {ASTNode[]} expression The arguments or parameters in the list | ||
* @param {boolean} hasLeftNewline `true` if the left curly has a newline in the current code. | ||
* @returns {boolean} `true` if there should be newlines inside the function curlys | ||
*/ | ||
function shouldHaveNewlines(expression, hasLeftNewline) { | ||
const expressionIsMultiline = expression.loc.start.line !== expression.loc.end.line; | ||
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if (multilineLaxOption && !expressionIsMultiline) { | ||
return hasLeftNewline; | ||
} | ||
if (multilineOption || multilineLaxOption) { | ||
return expressionIsMultiline; | ||
} | ||
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return hasLeftNewline; | ||
} | ||
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/** | ||
* Validates curlys | ||
* @param {Object} curlys An object with keys `leftParen` for the left paren token, and `rightParen` for the right paren token | ||
* @param {ASTNode} expression The expression inside the curly | ||
* @returns {void} | ||
*/ | ||
function validateCurlys(curlys, expression) { | ||
const leftCurly = curlys.leftCurly; | ||
const rightCurly = curlys.rightCurly; | ||
const tokenAfterLeftCurly = sourceCode.getTokenAfter(leftCurly); | ||
const tokenBeforeRightCurly = sourceCode.getTokenBefore(rightCurly); | ||
const hasLeftNewline = !isTokenOnSameLine( | ||
leftCurly, | ||
tokenAfterLeftCurly | ||
); | ||
const hasRightNewline = !isTokenOnSameLine( | ||
tokenBeforeRightCurly, | ||
rightCurly | ||
); | ||
const needsNewlines = shouldHaveNewlines(expression, hasLeftNewline); | ||
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if (hasLeftNewline && !needsNewlines) { | ||
context.report({ | ||
node: leftCurly, | ||
messageId: 'unexpectedAfter', | ||
fix(fixer) { | ||
return sourceCode | ||
.getText() | ||
.slice(leftCurly.range[1], tokenAfterLeftCurly.range[0]) | ||
.trim() | ||
? // If there is a comment between the { and the first element, don't do a fix. | ||
null | ||
: fixer.removeRange([ | ||
leftCurly.range[1], | ||
tokenAfterLeftCurly.range[0] | ||
]); | ||
} | ||
}); | ||
} else if (!hasLeftNewline && needsNewlines) { | ||
context.report({ | ||
node: leftCurly, | ||
messageId: 'expectedAfter', | ||
fix: fixer => fixer.insertTextAfter(leftCurly, '\n') | ||
}); | ||
} | ||
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if (hasRightNewline && !needsNewlines) { | ||
context.report({ | ||
node: rightCurly, | ||
messageId: 'unexpectedBefore', | ||
fix(fixer) { | ||
return sourceCode | ||
.getText() | ||
.slice(tokenBeforeRightCurly.range[1], rightCurly.range[0]) | ||
.trim() | ||
? // If there is a comment between the last element and the }, don't do a fix. | ||
null | ||
: fixer.removeRange([ | ||
tokenBeforeRightCurly.range[1], | ||
rightCurly.range[0] | ||
]); | ||
} | ||
}); | ||
} else if (!hasRightNewline && needsNewlines) { | ||
context.report({ | ||
node: rightCurly, | ||
messageId: 'expectedBefore', | ||
fix: fixer => fixer.insertTextBefore(rightCurly, '\n') | ||
}); | ||
} | ||
} | ||
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/** | ||
* Gets the left curly and right curly tokens of a node. | ||
* @param {ASTNode} node The JSXExpressionContainer node. | ||
* @returns {{leftCurly: Object, rightCurly: Object}} An object contaning left and right curly tokens. | ||
*/ | ||
function getCurlyTokens(node) { | ||
return { | ||
leftCurly: sourceCode.getFirstToken(node), | ||
rightCurly: sourceCode.getLastToken(node) | ||
}; | ||
} | ||
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/** | ||
* Validates the curlys for a JSXExpressionContainer node. | ||
* @param {ASTNode} node The JSXExpressionContainer node. | ||
* @returns {void} | ||
*/ | ||
function validateNode(node) { | ||
validateCurlys( | ||
getCurlyTokens(node), | ||
node.expression | ||
); | ||
} | ||
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// ---------------------------------------------------------------------- | ||
// Public | ||
// ---------------------------------------------------------------------- | ||
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return { | ||
JSXExpressionContainer: validateNode | ||
}; | ||
} | ||
}; |
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