208 lines
		
	
	
		
			7.8 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
			
		
		
	
	
			208 lines
		
	
	
		
			7.8 KiB
		
	
	
	
		
			JavaScript
		
	
	
	
	
	
/**
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 * @fileoverview Rule to flag when IIFE is not wrapped in parens
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 * @author Ilya Volodin
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 * @deprecated in ESLint v8.53.0
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 */
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils");
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const eslintUtils = require("@eslint-community/eslint-utils");
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//----------------------------------------------------------------------
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// Helpers
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//----------------------------------------------------------------------
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/**
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 * Check if the given node is callee of a `NewExpression` node
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 * @param {ASTNode} node node to check
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 * @returns {boolean} True if the node is callee of a `NewExpression` node
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 * @private
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 */
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function isCalleeOfNewExpression(node) {
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    const maybeCallee = node.parent.type === "ChainExpression"
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        ? node.parent
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        : node;
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    return (
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        maybeCallee.parent.type === "NewExpression" &&
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        maybeCallee.parent.callee === maybeCallee
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    );
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}
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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/** @type {import('../shared/types').Rule} */
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module.exports = {
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    meta: {
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        deprecated: true,
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        replacedBy: [],
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        type: "layout",
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        docs: {
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            description: "Require parentheses around immediate `function` invocations",
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            recommended: false,
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            url: "https://eslint.org/docs/latest/rules/wrap-iife"
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        },
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        schema: [
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            {
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                enum: ["outside", "inside", "any"]
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            },
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            {
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                type: "object",
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                properties: {
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                    functionPrototypeMethods: {
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                        type: "boolean",
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                        default: false
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                    }
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                },
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                additionalProperties: false
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            }
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        ],
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        fixable: "code",
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        messages: {
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            wrapInvocation: "Wrap an immediate function invocation in parentheses.",
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            wrapExpression: "Wrap only the function expression in parens.",
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            moveInvocation: "Move the invocation into the parens that contain the function."
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        }
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    },
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    create(context) {
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        const style = context.options[0] || "outside";
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        const includeFunctionPrototypeMethods = context.options[1] && context.options[1].functionPrototypeMethods;
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        const sourceCode = context.sourceCode;
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        /**
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         * Check if the node is wrapped in any (). All parens count: grouping parens and parens for constructs such as if()
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         * @param {ASTNode} node node to evaluate
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         * @returns {boolean} True if it is wrapped in any parens
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         * @private
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         */
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        function isWrappedInAnyParens(node) {
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            return astUtils.isParenthesised(sourceCode, node);
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        }
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        /**
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         * Check if the node is wrapped in grouping (). Parens for constructs such as if() don't count
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         * @param {ASTNode} node node to evaluate
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         * @returns {boolean} True if it is wrapped in grouping parens
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         * @private
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         */
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        function isWrappedInGroupingParens(node) {
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            return eslintUtils.isParenthesized(1, node, sourceCode);
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        }
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        /**
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         * Get the function node from an IIFE
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         * @param {ASTNode} node node to evaluate
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         * @returns {ASTNode} node that is the function expression of the given IIFE, or null if none exist
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         */
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        function getFunctionNodeFromIIFE(node) {
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            const callee = astUtils.skipChainExpression(node.callee);
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            if (callee.type === "FunctionExpression") {
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                return callee;
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            }
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            if (includeFunctionPrototypeMethods &&
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                callee.type === "MemberExpression" &&
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                callee.object.type === "FunctionExpression" &&
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                (astUtils.getStaticPropertyName(callee) === "call" || astUtils.getStaticPropertyName(callee) === "apply")
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            ) {
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                return callee.object;
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            }
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            return null;
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        }
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        return {
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            CallExpression(node) {
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                const innerNode = getFunctionNodeFromIIFE(node);
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                if (!innerNode) {
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                    return;
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                }
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                const isCallExpressionWrapped = isWrappedInAnyParens(node),
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                    isFunctionExpressionWrapped = isWrappedInAnyParens(innerNode);
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                if (!isCallExpressionWrapped && !isFunctionExpressionWrapped) {
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                    context.report({
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                        node,
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                        messageId: "wrapInvocation",
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                        fix(fixer) {
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                            const nodeToSurround = style === "inside" ? innerNode : node;
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                            return fixer.replaceText(nodeToSurround, `(${sourceCode.getText(nodeToSurround)})`);
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                        }
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                    });
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                } else if (style === "inside" && !isFunctionExpressionWrapped) {
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                    context.report({
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                        node,
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                        messageId: "wrapExpression",
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                        fix(fixer) {
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                            // The outer call expression will always be wrapped at this point.
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                            if (isWrappedInGroupingParens(node) && !isCalleeOfNewExpression(node)) {
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                                /*
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                                 * Parenthesize the function expression and remove unnecessary grouping parens around the call expression.
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                                 * Replace the range between the end of the function expression and the end of the call expression.
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                                 * for example, in `(function(foo) {}(bar))`, the range `(bar))` should get replaced with `)(bar)`.
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                                 */
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                                const parenAfter = sourceCode.getTokenAfter(node);
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                                return fixer.replaceTextRange(
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                                    [innerNode.range[1], parenAfter.range[1]],
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                                    `)${sourceCode.getText().slice(innerNode.range[1], parenAfter.range[0])}`
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                                );
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                            }
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                            /*
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                             * Call expression is wrapped in mandatory parens such as if(), or in necessary grouping parens.
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                             * These parens cannot be removed, so just parenthesize the function expression.
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                             */
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                            return fixer.replaceText(innerNode, `(${sourceCode.getText(innerNode)})`);
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                        }
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                    });
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                } else if (style === "outside" && !isCallExpressionWrapped) {
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                    context.report({
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                        node,
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                        messageId: "moveInvocation",
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                        fix(fixer) {
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                            /*
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                             * The inner function expression will always be wrapped at this point.
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                             * It's only necessary to replace the range between the end of the function expression
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                             * and the call expression. For example, in `(function(foo) {})(bar)`, the range `)(bar)`
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                             * should get replaced with `(bar))`.
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                             */
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                            const parenAfter = sourceCode.getTokenAfter(innerNode);
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                            return fixer.replaceTextRange(
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                                [parenAfter.range[0], node.range[1]],
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                                `${sourceCode.getText().slice(parenAfter.range[1], node.range[1])})`
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                            );
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                        }
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                    });
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                }
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            }
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        };
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    }
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};
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