space-unary-ops.js
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/**
* @fileoverview This rule shoud require or disallow spaces before or after unary operations.
* @author Marcin Kumorek
* @copyright 2014 Marcin Kumorek. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var options = context.options && Array.isArray(context.options) && context.options[0] || { words: true, nonwords: false };
//--------------------------------------------------------------------------
// Helpers
//--------------------------------------------------------------------------
/**
* Check if the node is the first "!" in a "!!" convert to Boolean expression
* @param {ASTnode} node AST node
* @returns {boolean} Whether or not the node is first "!" in "!!"
*/
function isFirstBangInBangBangExpression(node) {
return node && node.type === "UnaryExpression" && node.argument.operator === "!" &&
node.argument && node.argument.type === "UnaryExpression" && node.argument.operator === "!";
}
/**
* Check if the node's child argument is an "ObjectExpression"
* @param {ASTnode} node AST node
* @returns {boolean} Whether or not the argument's type is "ObjectExpression"
*/
function isArgumentObjectExpression(node) {
return node.argument && node.argument.type && node.argument.type === "ObjectExpression";
}
/**
* Check Unary Word Operators for spaces after the word operator
* @param {ASTnode} node AST node
* @param {object} firstToken first token from the AST node
* @param {object} secondToken second token from the AST node
* @param {string} word The word to be used for reporting
* @returns {void}
*/
function checkUnaryWordOperatorForSpaces(node, firstToken, secondToken, word) {
word = word || firstToken.value;
if (options.words) {
if (secondToken.range[0] === firstToken.range[1]) {
context.report({
node: node,
message: "Unary word operator \"" + word + "\" must be followed by whitespace.",
fix: function(fixer) {
return fixer.insertTextAfter(firstToken, " ");
}
});
}
}
if (!options.words && isArgumentObjectExpression(node)) {
if (secondToken.range[0] > firstToken.range[1]) {
context.report({
node: node,
message: "Unexpected space after unary word operator \"" + word + "\".",
fix: function(fixer) {
return fixer.removeRange([firstToken.range[1], secondToken.range[0]]);
}
});
}
}
}
/**
* Checks UnaryExpression, UpdateExpression and NewExpression for spaces before and after the operator
* @param {ASTnode} node AST node
* @returns {void}
*/
function checkForSpaces(node) {
var tokens = context.getFirstTokens(node, 2),
firstToken = tokens[0],
secondToken = tokens[1];
if ((node.type === "NewExpression" || node.prefix) && firstToken.type === "Keyword") {
checkUnaryWordOperatorForSpaces(node, firstToken, secondToken);
return void 0;
}
if (options.nonwords) {
if (node.prefix) {
if (isFirstBangInBangBangExpression(node)) {
return void 0;
}
if (firstToken.range[1] === secondToken.range[0]) {
context.report({
node: node,
message: "Unary operator \"" + firstToken.value + "\" must be followed by whitespace.",
fix: function(fixer) {
return fixer.insertTextAfter(firstToken, " ");
}
});
}
} else {
if (firstToken.range[1] === secondToken.range[0]) {
context.report({
node: node,
message: "Space is required before unary expressions \"" + secondToken.value + "\".",
fix: function(fixer) {
return fixer.insertTextBefore(secondToken, " ");
}
});
}
}
} else {
if (node.prefix) {
if (secondToken.range[0] > firstToken.range[1]) {
context.report({
node: node,
message: "Unexpected space after unary operator \"" + firstToken.value + "\".",
fix: function(fixer) {
return fixer.removeRange([firstToken.range[1], secondToken.range[0]]);
}
});
}
} else {
if (secondToken.range[0] > firstToken.range[1]) {
context.report({
node: node,
message: "Unexpected space before unary operator \"" + secondToken.value + "\".",
fix: function(fixer) {
return fixer.removeRange([firstToken.range[1], secondToken.range[0]]);
}
});
}
}
}
}
//--------------------------------------------------------------------------
// Public
//--------------------------------------------------------------------------
return {
"UnaryExpression": checkForSpaces,
"UpdateExpression": checkForSpaces,
"NewExpression": checkForSpaces,
"YieldExpression": function(node) {
var tokens = context.getFirstTokens(node, 3),
word = "yield";
if (!node.argument) {
return;
}
if (node.delegate) {
word += "*";
checkUnaryWordOperatorForSpaces(node, tokens[1], tokens[2], word);
} else {
checkUnaryWordOperatorForSpaces(node, tokens[0], tokens[1], word);
}
}
};
};
module.exports.schema = [
{
"type": "object",
"properties": {
"words": {
"type": "boolean"
},
"nonwords": {
"type": "boolean"
}
},
"additionalProperties": false
}
];