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app_vue/node_modules/eslint/lib/rules/wrap-iife.js

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