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Viewing file:     no-plusplus.js (3.1 KB)      -rw-r--r--

/**
 * @fileoverview Rule to flag use of unary increment and decrement operators.
 * @author Ian Christian Myers
 * @author Brody McKee (github.com/mrmckeb)
 */

"use strict";

//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------

/**
 * Determines whether the given node is the update node of a `ForStatement`.
 * @param {ASTNode} node The node to check.
 * @returns {boolean} `true` if the node is `ForStatement` update.
 */
function isForStatementUpdate(node) {
    const parent = node.parent;

    return parent.type === "ForStatement" && parent.update === node;
}

/**
 * Determines whether the given node is considered to be a for loop "afterthought" by the logic of this rule.
 * In particular, it returns `true` if the given node is either:
 *   - The update node of a `ForStatement`: for (;; i++) {}
 *   - An operand of a sequence expression that is the update node: for (;; foo(), i++) {}
 *   - An operand of a sequence expression that is child of another sequence expression, etc.,
 *     up to the sequence expression that is the update node: for (;; foo(), (bar(), (baz(), i++))) {}
 * @param {ASTNode} node The node to check.
 * @returns {boolean} `true` if the node is a for loop afterthought.
 */
function isForLoopAfterthought(node) {
    const parent = node.parent;

    if (parent.type === "SequenceExpression") {
        return isForLoopAfterthought(parent);
    }

    return isForStatementUpdate(node);
}

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../shared/types').Rule} */
module.exports = {
    meta: {
        type: "suggestion",

        docs: {
            description: "Disallow the unary operators `++` and `--`",
            recommended: false,
            url: "https://eslint.org/docs/latest/rules/no-plusplus"
        },

        schema: [
            {
                type: "object",
                properties: {
                    allowForLoopAfterthoughts: {
                        type: "boolean",
                        default: false
                    }
                },
                additionalProperties: false
            }
        ],

        messages: {
            unexpectedUnaryOp: "Unary operator '{{operator}}' used."
        }
    },

    create(context) {

        const config = context.options[0];
        let allowForLoopAfterthoughts = false;

        if (typeof config === "object") {
            allowForLoopAfterthoughts = config.allowForLoopAfterthoughts === true;
        }

        return {

            UpdateExpression(node) {
                if (allowForLoopAfterthoughts && isForLoopAfterthought(node)) {
                    return;
                }

                context.report({
                    node,
                    messageId: "unexpectedUnaryOp",
                    data: {
                        operator: node.operator
                    }
                });
            }

        };

    }
};