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/**
* @fileoverview Rule to check the spacing around the * in generator functions.
* @author Jamund Ferguson
* @copyright 2015 Brandon Mills. All rights reserved.
* @copyright 2014 Jamund Ferguson. All rights reserved.
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = function(context) {
var mode = {
before: { before: true, after: false },
after: { before: false, after: true },
both: { before: true, after: true },
neither: { before: false, after: false }
}[context.options[0] || "before"];
/**
* Checks the spacing between two tokens before or after the star token.
* @param {string} side Either "before" or "after".
* @param {Token} leftToken `function` keyword token if side is "before", or
* star token if side is "after".
* @param {Token} rightToken Star token if side is "before", or identifier
* token if side is "after".
* @returns {void}
*/
function checkSpacing(side, leftToken, rightToken) {
if (!!(rightToken.range[0] - leftToken.range[1]) !== mode[side]) {
context.report(
leftToken.value === "*" ? leftToken : rightToken,
"{{type}} space {{side}} *.",
{
type: mode[side] ? "Missing" : "Unexpected",
side: side
}
);
}
}
/**
* Enforces the spacing around the star if node is a generator function.
* @param {ASTNode} node A function expression or declaration node.
* @returns {void}
*/
function checkFunction(node) {
var isMethod, starToken, tokenBefore, tokenAfter;
if (!node.generator) {
return;
}
isMethod = !!context.getAncestors().pop().method;
if (isMethod) {
starToken = context.getTokenBefore(node, 1);
} else {
starToken = context.getFirstToken(node, 1);
}
// Only check before when preceded by `function` keyword
tokenBefore = context.getTokenBefore(starToken);
if (tokenBefore.value === "function") {
checkSpacing("before", tokenBefore, starToken);
}
// Only check after when followed by an identifier
tokenAfter = context.getTokenAfter(starToken);
if (tokenAfter.type === "Identifier") {
checkSpacing("after", starToken, tokenAfter);
}
}
return {
"FunctionDeclaration": checkFunction,
"FunctionExpression": checkFunction
};
};
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