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/**
* @fileoverview Rule to check the spacing around the * in yield* expressions.
* @author Bryan Smith
*/
"use strict";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
module.exports = {
meta: {
docs: {
description: "require or disallow spacing around the `*` in `yield*` expressions",
category: "ECMAScript 6",
recommended: false
},
fixable: "whitespace",
schema: [
{
oneOf: [
{
enum: ["before", "after", "both", "neither"]
},
{
type: "object",
properties: {
before: { type: "boolean" },
after: { type: "boolean" }
},
additionalProperties: false
}
]
}
]
},
create(context) {
const sourceCode = context.getSourceCode();
const mode = (function(option) {
if (!option || typeof option === "string") {
return {
before: { before: true, after: false },
after: { before: false, after: true },
both: { before: true, after: true },
neither: { before: false, after: false }
}[option || "after"];
}
return option;
}(context.options[0]));
/**
* 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 (sourceCode.isSpaceBetweenTokens(leftToken, rightToken) !== mode[side]) {
const after = leftToken.value === "*";
const spaceRequired = mode[side];
const node = after ? leftToken : rightToken;
const type = spaceRequired ? "Missing" : "Unexpected";
const message = "{{type}} space {{side}} *.";
context.report({
node,
message,
data: {
type,
side
},
fix(fixer) {
if (spaceRequired) {
if (after) {
return fixer.insertTextAfter(node, " ");
}
return fixer.insertTextBefore(node, " ");
}
return fixer.removeRange([leftToken.range[1], rightToken.range[0]]);
}
});
}
}
/**
* Enforces the spacing around the star if node is a yield* expression.
* @param {ASTNode} node A yield expression node.
* @returns {void}
*/
function checkExpression(node) {
if (!node.delegate) {
return;
}
const tokens = sourceCode.getFirstTokens(node, 3);
const yieldToken = tokens[0];
const starToken = tokens[1];
const nextToken = tokens[2];
checkSpacing("before", yieldToken, starToken);
checkSpacing("after", starToken, nextToken);
}
return {
YieldExpression: checkExpression
};
}
};
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