282 lines
11 KiB
JavaScript
282 lines
11 KiB
JavaScript
|
/**
|
||
|
|
* @fileoverview enforce consistent line breaks inside function parentheses
|
||
|
|
* @author Teddy Katz
|
||
|
|
*/
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Requirements
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
const astUtils = require("./utils/ast-utils");
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Rule Definition
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
meta: {
|
||
|
|
type: "layout",
|
||
|
|
|
||
|
|
docs: {
|
||
|
|
description: "enforce consistent line breaks inside function parentheses",
|
||
|
|
category: "Stylistic Issues",
|
||
|
|
recommended: false,
|
||
|
|
url: "https://eslint.org/docs/rules/function-paren-newline"
|
||
|
|
},
|
||
|
|
|
||
|
|
fixable: "whitespace",
|
||
|
|
|
||
|
|
schema: [
|
||
|
|
{
|
||
|
|
oneOf: [
|
||
|
|
{
|
||
|
|
enum: ["always", "never", "consistent", "multiline", "multiline-arguments"]
|
||
|
|
},
|
||
|
|
{
|
||
|
|
type: "object",
|
||
|
|
properties: {
|
||
|
|
minItems: {
|
||
|
|
type: "integer",
|
||
|
|
minimum: 0
|
||
|
|
}
|
||
|
|
},
|
||
|
|
additionalProperties: false
|
||
|
|
}
|
||
|
|
]
|
||
|
|
}
|
||
|
|
],
|
||
|
|
|
||
|
|
messages: {
|
||
|
|
expectedBefore: "Expected newline before ')'.",
|
||
|
|
expectedAfter: "Expected newline after '('.",
|
||
|
|
expectedBetween: "Expected newline between arguments/params.",
|
||
|
|
unexpectedBefore: "Unexpected newline before ')'.",
|
||
|
|
unexpectedAfter: "Unexpected newline after '('."
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
create(context) {
|
||
|
|
const sourceCode = context.getSourceCode();
|
||
|
|
const rawOption = context.options[0] || "multiline";
|
||
|
|
const multilineOption = rawOption === "multiline";
|
||
|
|
const multilineArgumentsOption = rawOption === "multiline-arguments";
|
||
|
|
const consistentOption = rawOption === "consistent";
|
||
|
|
let minItems;
|
||
|
|
|
||
|
|
if (typeof rawOption === "object") {
|
||
|
|
minItems = rawOption.minItems;
|
||
|
|
} else if (rawOption === "always") {
|
||
|
|
minItems = 0;
|
||
|
|
} else if (rawOption === "never") {
|
||
|
|
minItems = Infinity;
|
||
|
|
} else {
|
||
|
|
minItems = null;
|
||
|
|
}
|
||
|
|
|
||
|
|
//----------------------------------------------------------------------
|
||
|
|
// Helpers
|
||
|
|
//----------------------------------------------------------------------
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Determines whether there should be newlines inside function parens
|
||
|
|
* @param {ASTNode[]} elements The arguments or parameters in the list
|
||
|
|
* @param {boolean} hasLeftNewline `true` if the left paren has a newline in the current code.
|
||
|
|
* @returns {boolean} `true` if there should be newlines inside the function parens
|
||
|
|
*/
|
||
|
|
function shouldHaveNewlines(elements, hasLeftNewline) {
|
||
|
|
if (multilineArgumentsOption && elements.length === 1) {
|
||
|
|
return hasLeftNewline;
|
||
|
|
}
|
||
|
|
if (multilineOption || multilineArgumentsOption) {
|
||
|
|
return elements.some((element, index) => index !== elements.length - 1 && element.loc.end.line !== elements[index + 1].loc.start.line);
|
||
|
|
}
|
||
|
|
if (consistentOption) {
|
||
|
|
return hasLeftNewline;
|
||
|
|
}
|
||
|
|
return elements.length >= minItems;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Validates parens
|
||
|
|
* @param {Object} parens An object with keys `leftParen` for the left paren token, and `rightParen` for the right paren token
|
||
|
|
* @param {ASTNode[]} elements The arguments or parameters in the list
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function validateParens(parens, elements) {
|
||
|
|
const leftParen = parens.leftParen;
|
||
|
|
const rightParen = parens.rightParen;
|
||
|
|
const tokenAfterLeftParen = sourceCode.getTokenAfter(leftParen);
|
||
|
|
const tokenBeforeRightParen = sourceCode.getTokenBefore(rightParen);
|
||
|
|
const hasLeftNewline = !astUtils.isTokenOnSameLine(leftParen, tokenAfterLeftParen);
|
||
|
|
const hasRightNewline = !astUtils.isTokenOnSameLine(tokenBeforeRightParen, rightParen);
|
||
|
|
const needsNewlines = shouldHaveNewlines(elements, hasLeftNewline);
|
||
|
|
|
||
|
|
if (hasLeftNewline && !needsNewlines) {
|
||
|
|
context.report({
|
||
|
|
node: leftParen,
|
||
|
|
messageId: "unexpectedAfter",
|
||
|
|
fix(fixer) {
|
||
|
|
return sourceCode.getText().slice(leftParen.range[1], tokenAfterLeftParen.range[0]).trim()
|
||
|
|
|
||
|
|
// If there is a comment between the ( and the first element, don't do a fix.
|
||
|
|
? null
|
||
|
|
: fixer.removeRange([leftParen.range[1], tokenAfterLeftParen.range[0]]);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
} else if (!hasLeftNewline && needsNewlines) {
|
||
|
|
context.report({
|
||
|
|
node: leftParen,
|
||
|
|
messageId: "expectedAfter",
|
||
|
|
fix: fixer => fixer.insertTextAfter(leftParen, "\n")
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
if (hasRightNewline && !needsNewlines) {
|
||
|
|
context.report({
|
||
|
|
node: rightParen,
|
||
|
|
messageId: "unexpectedBefore",
|
||
|
|
fix(fixer) {
|
||
|
|
return sourceCode.getText().slice(tokenBeforeRightParen.range[1], rightParen.range[0]).trim()
|
||
|
|
|
||
|
|
// If there is a comment between the last element and the ), don't do a fix.
|
||
|
|
? null
|
||
|
|
: fixer.removeRange([tokenBeforeRightParen.range[1], rightParen.range[0]]);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
} else if (!hasRightNewline && needsNewlines) {
|
||
|
|
context.report({
|
||
|
|
node: rightParen,
|
||
|
|
messageId: "expectedBefore",
|
||
|
|
fix: fixer => fixer.insertTextBefore(rightParen, "\n")
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Validates a list of arguments or parameters
|
||
|
|
* @param {Object} parens An object with keys `leftParen` for the left paren token, and `rightParen` for the right paren token
|
||
|
|
* @param {ASTNode[]} elements The arguments or parameters in the list
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function validateArguments(parens, elements) {
|
||
|
|
const leftParen = parens.leftParen;
|
||
|
|
const tokenAfterLeftParen = sourceCode.getTokenAfter(leftParen);
|
||
|
|
const hasLeftNewline = !astUtils.isTokenOnSameLine(leftParen, tokenAfterLeftParen);
|
||
|
|
const needsNewlines = shouldHaveNewlines(elements, hasLeftNewline);
|
||
|
|
|
||
|
|
for (let i = 0; i <= elements.length - 2; i++) {
|
||
|
|
const currentElement = elements[i];
|
||
|
|
const nextElement = elements[i + 1];
|
||
|
|
const hasNewLine = currentElement.loc.end.line !== nextElement.loc.start.line;
|
||
|
|
|
||
|
|
if (!hasNewLine && needsNewlines) {
|
||
|
|
context.report({
|
||
|
|
node: currentElement,
|
||
|
|
messageId: "expectedBetween",
|
||
|
|
fix: fixer => fixer.insertTextBefore(nextElement, "\n")
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Gets the left paren and right paren tokens of a node.
|
||
|
|
* @param {ASTNode} node The node with parens
|
||
|
|
* @returns {Object} An object with keys `leftParen` for the left paren token, and `rightParen` for the right paren token.
|
||
|
|
* Can also return `null` if an expression has no parens (e.g. a NewExpression with no arguments, or an ArrowFunctionExpression
|
||
|
|
* with a single parameter)
|
||
|
|
*/
|
||
|
|
function getParenTokens(node) {
|
||
|
|
switch (node.type) {
|
||
|
|
case "NewExpression":
|
||
|
|
if (!node.arguments.length && !(
|
||
|
|
astUtils.isOpeningParenToken(sourceCode.getLastToken(node, { skip: 1 })) &&
|
||
|
|
astUtils.isClosingParenToken(sourceCode.getLastToken(node))
|
||
|
|
)) {
|
||
|
|
|
||
|
|
// If the NewExpression does not have parens (e.g. `new Foo`), return null.
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
// falls through
|
||
|
|
|
||
|
|
case "CallExpression":
|
||
|
|
return {
|
||
|
|
leftParen: sourceCode.getTokenAfter(node.callee, astUtils.isOpeningParenToken),
|
||
|
|
rightParen: sourceCode.getLastToken(node)
|
||
|
|
};
|
||
|
|
|
||
|
|
case "FunctionDeclaration":
|
||
|
|
case "FunctionExpression": {
|
||
|
|
const leftParen = sourceCode.getFirstToken(node, astUtils.isOpeningParenToken);
|
||
|
|
const rightParen = node.params.length
|
||
|
|
? sourceCode.getTokenAfter(node.params[node.params.length - 1], astUtils.isClosingParenToken)
|
||
|
|
: sourceCode.getTokenAfter(leftParen);
|
||
|
|
|
||
|
|
return { leftParen, rightParen };
|
||
|
|
}
|
||
|
|
|
||
|
|
case "ArrowFunctionExpression": {
|
||
|
|
const firstToken = sourceCode.getFirstToken(node);
|
||
|
|
|
||
|
|
if (!astUtils.isOpeningParenToken(firstToken)) {
|
||
|
|
|
||
|
|
// If the ArrowFunctionExpression has a single param without parens, return null.
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
|
||
|
|
return {
|
||
|
|
leftParen: firstToken,
|
||
|
|
rightParen: sourceCode.getTokenBefore(node.body, astUtils.isClosingParenToken)
|
||
|
|
};
|
||
|
|
}
|
||
|
|
|
||
|
|
case "ImportExpression": {
|
||
|
|
const leftParen = sourceCode.getFirstToken(node, 1);
|
||
|
|
const rightParen = sourceCode.getLastToken(node);
|
||
|
|
|
||
|
|
return { leftParen, rightParen };
|
||
|
|
}
|
||
|
|
|
||
|
|
default:
|
||
|
|
throw new TypeError(`unexpected node with type ${node.type}`);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
//----------------------------------------------------------------------
|
||
|
|
// Public
|
||
|
|
//----------------------------------------------------------------------
|
||
|
|
|
||
|
|
return {
|
||
|
|
[[
|
||
|
|
"ArrowFunctionExpression",
|
||
|
|
"CallExpression",
|
||
|
|
"FunctionDeclaration",
|
||
|
|
"FunctionExpression",
|
||
|
|
"ImportExpression",
|
||
|
|
"NewExpression"
|
||
|
|
]](node) {
|
||
|
|
const parens = getParenTokens(node);
|
||
|
|
let params;
|
||
|
|
|
||
|
|
if (node.type === "ImportExpression") {
|
||
|
|
params = [node.source];
|
||
|
|
} else if (astUtils.isFunction(node)) {
|
||
|
|
params = node.params;
|
||
|
|
} else {
|
||
|
|
params = node.arguments;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (parens) {
|
||
|
|
validateParens(parens, params);
|
||
|
|
|
||
|
|
if (multilineArgumentsOption) {
|
||
|
|
validateArguments(parens, params);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
};
|