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/**
* @fileoverview Require spaces around infix operators
* @author Michael Ficarra
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
type: "layout",
docs: {
description: "require spacing around infix operators",
category: "Stylistic Issues",
recommended: false,
url: "https://eslint.org/docs/rules/space-infix-ops"
},
fixable: "whitespace",
schema: [
{
type: "object",
properties: {
int32Hint: {
type: "boolean",
default: false
}
},
additionalProperties: false
}
]
},
create(context) {
const int32Hint = context.options[0] ? context.options[0].int32Hint === true : false;
const sourceCode = context.getSourceCode();
/**
* Returns the first token which violates the rule
* @param {ASTNode} left - The left node of the main node
* @param {ASTNode} right - The right node of the main node
* @param {string} op - The operator of the main node
* @returns {Object} The violator token or null
* @private
*/
function getFirstNonSpacedToken(left, right, op) {
const operator = sourceCode.getFirstTokenBetween(left, right, token => token.value === op);
const prev = sourceCode.getTokenBefore(operator);
const next = sourceCode.getTokenAfter(operator);
if (!sourceCode.isSpaceBetweenTokens(prev, operator) || !sourceCode.isSpaceBetweenTokens(operator, next)) {
return operator;
}
return null;
}
/**
* Reports an AST node as a rule violation
* @param {ASTNode} mainNode - The node to report
* @param {Object} culpritToken - The token which has a problem
* @returns {void}
* @private
*/
function report(mainNode, culpritToken) {
context.report({
node: mainNode,
loc: culpritToken.loc.start,
message: "Operator '{{operator}}' must be spaced.",
data: {
operator: culpritToken.value
},
fix(fixer) {
const previousToken = sourceCode.getTokenBefore(culpritToken);
const afterToken = sourceCode.getTokenAfter(culpritToken);
let fixString = "";
if (culpritToken.range[0] - previousToken.range[1] === 0) {
fixString = " ";
}
fixString += culpritToken.value;
if (afterToken.range[0] - culpritToken.range[1] === 0) {
fixString += " ";
}
return fixer.replaceText(culpritToken, fixString);
}
});
}
/**
* Check if the node is binary then report
* @param {ASTNode} node node to evaluate
* @returns {void}
* @private
*/
function checkBinary(node) {
const leftNode = (node.left.typeAnnotation) ? node.left.typeAnnotation : node.left;
const rightNode = node.right;
// search for = in AssignmentPattern nodes
const operator = node.operator || "=";
const nonSpacedNode = getFirstNonSpacedToken(leftNode, rightNode, operator);
if (nonSpacedNode) {
if (!(int32Hint && sourceCode.getText(node).endsWith("|0"))) {
report(node, nonSpacedNode);
}
}
}
/**
* Check if the node is conditional
* @param {ASTNode} node node to evaluate
* @returns {void}
* @private
*/
function checkConditional(node) {
const nonSpacedConsequesntNode = getFirstNonSpacedToken(node.test, node.consequent, "?");
const nonSpacedAlternateNode = getFirstNonSpacedToken(node.consequent, node.alternate, ":");
if (nonSpacedConsequesntNode) {
report(node, nonSpacedConsequesntNode);
} else if (nonSpacedAlternateNode) {
report(node, nonSpacedAlternateNode);
}
}
/**
* Check if the node is a variable
* @param {ASTNode} node node to evaluate
* @returns {void}
* @private
*/
function checkVar(node) {
const leftNode = (node.id.typeAnnotation) ? node.id.typeAnnotation : node.id;
const rightNode = node.init;
if (rightNode) {
const nonSpacedNode = getFirstNonSpacedToken(leftNode, rightNode, "=");
if (nonSpacedNode) {
report(node, nonSpacedNode);
}
}
}
return {
AssignmentExpression: checkBinary,
AssignmentPattern: checkBinary,
BinaryExpression: checkBinary,
LogicalExpression: checkBinary,
ConditionalExpression: checkConditional,
VariableDeclarator: checkVar
};
}
};