space-infix-ops.js
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/**
* @fileoverview Require spaces around infix operators
* @author Michael Ficarra
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var int32Hint = context.options[0] ? context.options[0].int32Hint === true : false;
var OPERATORS = [
"*", "/", "%", "+", "-", "<<", ">>", ">>>", "<", "<=", ">", ">=", "in",
"instanceof", "==", "!=", "===", "!==", "&", "^", "|", "&&", "||", "=",
"+=", "-=", "*=", "/=", "%=", "<<=", ">>=", ">>>=", "&=", "^=", "|=",
"?", ":", ","
];
/**
* 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
* @returns {object} The violator token or null
* @private
*/
function getFirstNonSpacedToken(left, right) {
var op, tokens = context.getTokensBetween(left, right, 1);
for (var i = 1, l = tokens.length - 1; i < l; ++i) {
op = tokens[i];
if (
op.type === "Punctuator" &&
OPERATORS.indexOf(op.value) >= 0 &&
(tokens[i - 1].range[1] >= op.range[0] || op.range[1] >= tokens[i + 1].range[0])
) {
return op;
}
}
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: "Infix operators must be spaced.",
fix: function(fixer) {
var previousToken = context.getTokenBefore(culpritToken);
var afterToken = context.getTokenAfter(culpritToken);
var 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) {
var nonSpacedNode = getFirstNonSpacedToken(node.left, node.right);
if (nonSpacedNode) {
if (!(int32Hint && context.getSource(node).substr(-2) === "|0")) {
report(node, nonSpacedNode);
}
}
}
/**
* Check if the node is conditional
* @param {ASTNode} node node to evaluate
* @returns {void}
* @private
*/
function checkConditional(node) {
var nonSpacedConsequesntNode = getFirstNonSpacedToken(node.test, node.consequent);
var 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) {
var nonSpacedNode;
if (node.init) {
nonSpacedNode = getFirstNonSpacedToken(node.id, node.init);
if (nonSpacedNode) {
report(node, nonSpacedNode);
}
}
}
return {
"AssignmentExpression": checkBinary,
"AssignmentPattern": checkBinary,
"BinaryExpression": checkBinary,
"LogicalExpression": checkBinary,
"ConditionalExpression": checkConditional,
"VariableDeclarator": checkVar
};
};
module.exports.schema = [
{
"type": "object",
"properties": {
"int32Hint": {
"type": "boolean"
}
},
"additionalProperties": false
}
];