90 lines
2.7 KiB
JavaScript
90 lines
2.7 KiB
JavaScript
|
/**
|
||
|
|
* @fileoverview Rule to check multiple var declarations per line
|
||
|
|
* @author Alberto Rodríguez
|
||
|
|
*/
|
||
|
|
"use strict";
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Rule Definition
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
module.exports = {
|
||
|
|
meta: {
|
||
|
|
type: "suggestion",
|
||
|
|
|
||
|
|
docs: {
|
||
|
|
description: "require or disallow newlines around variable declarations",
|
||
|
|
category: "Stylistic Issues",
|
||
|
|
recommended: false,
|
||
|
|
url: "https://eslint.org/docs/rules/one-var-declaration-per-line"
|
||
|
|
},
|
||
|
|
|
||
|
|
schema: [
|
||
|
|
{
|
||
|
|
enum: ["always", "initializations"]
|
||
|
|
}
|
||
|
|
],
|
||
|
|
|
||
|
|
fixable: "whitespace"
|
||
|
|
},
|
||
|
|
|
||
|
|
create(context) {
|
||
|
|
|
||
|
|
const ERROR_MESSAGE = "Expected variable declaration to be on a new line.";
|
||
|
|
const always = context.options[0] === "always";
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
// Helpers
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Determine if provided keyword is a variant of for specifiers
|
||
|
|
* @private
|
||
|
|
* @param {string} keyword keyword to test
|
||
|
|
* @returns {boolean} True if `keyword` is a variant of for specifier
|
||
|
|
*/
|
||
|
|
function isForTypeSpecifier(keyword) {
|
||
|
|
return keyword === "ForStatement" || keyword === "ForInStatement" || keyword === "ForOfStatement";
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Checks newlines around variable declarations.
|
||
|
|
* @private
|
||
|
|
* @param {ASTNode} node `VariableDeclaration` node to test
|
||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function checkForNewLine(node) {
|
||
|
|
if (isForTypeSpecifier(node.parent.type)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
const declarations = node.declarations;
|
||
|
|
let prev;
|
||
|
|
|
||
|
|
declarations.forEach(current => {
|
||
|
|
if (prev && prev.loc.end.line === current.loc.start.line) {
|
||
|
|
if (always || prev.init || current.init) {
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
message: ERROR_MESSAGE,
|
||
|
|
loc: current.loc.start,
|
||
|
|
fix: fixer => fixer.insertTextBefore(current, "\n")
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
prev = current;
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
// Public
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
|
||
|
|
return {
|
||
|
|
VariableDeclaration: checkForNewLine
|
||
|
|
};
|
||
|
|
|
||
|
|
}
|
||
|
|
};
|