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app_vue/node_modules/eslint/lib/rules/space-unary-ops.js

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+/**
+ * @fileoverview This rule should require or disallow spaces before or after unary operations.
+ * @author Marcin Kumorek
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent spacing before or after unary operators",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/space-unary-ops"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    words: {
+                        type: "boolean",
+                        default: true
+                    },
+                    nonwords: {
+                        type: "boolean",
+                        default: false
+                    },
+                    overrides: {
+                        type: "object",
+                        additionalProperties: {
+                            type: "boolean"
+                        }
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+        messages: {
+            unexpectedBefore: "Unexpected space before unary operator '{{operator}}'.",
+            unexpectedAfter: "Unexpected space after unary operator '{{operator}}'.",
+            unexpectedAfterWord: "Unexpected space after unary word operator '{{word}}'.",
+            wordOperator: "Unary word operator '{{word}}' must be followed by whitespace.",
+            operator: "Unary operator '{{operator}}' must be followed by whitespace.",
+            beforeUnaryExpressions: "Space is required before unary expressions '{{token}}'."
+        }
+    },
+
+    create(context) {
+        const options = context.options[0] || { words: true, nonwords: false };
+
+        const sourceCode = context.getSourceCode();
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Check if the node is the first "!" in a "!!" convert to Boolean expression
+         * @param {ASTnode} node AST node
+         * @returns {boolean} Whether or not the node is first "!" in "!!"
+         */
+        function isFirstBangInBangBangExpression(node) {
+            return node && node.type === "UnaryExpression" && node.argument.operator === "!" &&
+                node.argument && node.argument.type === "UnaryExpression" && node.argument.operator === "!";
+        }
+
+        /**
+         * Checks if an override exists for a given operator.
+         * @param {string} operator Operator
+         * @returns {boolean} Whether or not an override has been provided for the operator
+         */
+        function overrideExistsForOperator(operator) {
+            return options.overrides && Object.prototype.hasOwnProperty.call(options.overrides, operator);
+        }
+
+        /**
+         * Gets the value that the override was set to for this operator
+         * @param {string} operator Operator
+         * @returns {boolean} Whether or not an override enforces a space with this operator
+         */
+        function overrideEnforcesSpaces(operator) {
+            return options.overrides[operator];
+        }
+
+        /**
+         * Verify Unary Word Operator has spaces after the word operator
+         * @param {ASTnode} node AST node
+         * @param {Object} firstToken first token from the AST node
+         * @param {Object} secondToken second token from the AST node
+         * @param {string} word The word to be used for reporting
+         * @returns {void}
+         */
+        function verifyWordHasSpaces(node, firstToken, secondToken, word) {
+            if (secondToken.range[0] === firstToken.range[1]) {
+                context.report({
+                    node,
+                    messageId: "wordOperator",
+                    data: {
+                        word
+                    },
+                    fix(fixer) {
+                        return fixer.insertTextAfter(firstToken, " ");
+                    }
+                });
+            }
+        }
+
+        /**
+         * Verify Unary Word Operator doesn't have spaces after the word operator
+         * @param {ASTnode} node AST node
+         * @param {Object} firstToken first token from the AST node
+         * @param {Object} secondToken second token from the AST node
+         * @param {string} word The word to be used for reporting
+         * @returns {void}
+         */
+        function verifyWordDoesntHaveSpaces(node, firstToken, secondToken, word) {
+            if (astUtils.canTokensBeAdjacent(firstToken, secondToken)) {
+                if (secondToken.range[0] > firstToken.range[1]) {
+                    context.report({
+                        node,
+                        messageId: "unexpectedAfterWord",
+                        data: {
+                            word
+                        },
+                        fix(fixer) {
+                            return fixer.removeRange([firstToken.range[1], secondToken.range[0]]);
+                        }
+                    });
+                }
+            }
+        }
+
+        /**
+         * Check Unary Word Operators for spaces after the word operator
+         * @param {ASTnode} node AST node
+         * @param {Object} firstToken first token from the AST node
+         * @param {Object} secondToken second token from the AST node
+         * @param {string} word The word to be used for reporting
+         * @returns {void}
+         */
+        function checkUnaryWordOperatorForSpaces(node, firstToken, secondToken, word) {
+            if (overrideExistsForOperator(word)) {
+                if (overrideEnforcesSpaces(word)) {
+                    verifyWordHasSpaces(node, firstToken, secondToken, word);
+                } else {
+                    verifyWordDoesntHaveSpaces(node, firstToken, secondToken, word);
+                }
+            } else if (options.words) {
+                verifyWordHasSpaces(node, firstToken, secondToken, word);
+            } else {
+                verifyWordDoesntHaveSpaces(node, firstToken, secondToken, word);
+            }
+        }
+
+        /**
+         * Verifies YieldExpressions satisfy spacing requirements
+         * @param {ASTnode} node AST node
+         * @returns {void}
+         */
+        function checkForSpacesAfterYield(node) {
+            const tokens = sourceCode.getFirstTokens(node, 3),
+                word = "yield";
+
+            if (!node.argument || node.delegate) {
+                return;
+            }
+
+            checkUnaryWordOperatorForSpaces(node, tokens[0], tokens[1], word);
+        }
+
+        /**
+         * Verifies AwaitExpressions satisfy spacing requirements
+         * @param {ASTNode} node AwaitExpression AST node
+         * @returns {void}
+         */
+        function checkForSpacesAfterAwait(node) {
+            const tokens = sourceCode.getFirstTokens(node, 3);
+
+            checkUnaryWordOperatorForSpaces(node, tokens[0], tokens[1], "await");
+        }
+
+        /**
+         * Verifies UnaryExpression, UpdateExpression and NewExpression have spaces before or after the operator
+         * @param {ASTnode} node AST node
+         * @param {Object} firstToken First token in the expression
+         * @param {Object} secondToken Second token in the expression
+         * @returns {void}
+         */
+        function verifyNonWordsHaveSpaces(node, firstToken, secondToken) {
+            if (node.prefix) {
+                if (isFirstBangInBangBangExpression(node)) {
+                    return;
+                }
+                if (firstToken.range[1] === secondToken.range[0]) {
+                    context.report({
+                        node,
+                        messageId: "operator",
+                        data: {
+                            operator: firstToken.value
+                        },
+                        fix(fixer) {
+                            return fixer.insertTextAfter(firstToken, " ");
+                        }
+                    });
+                }
+            } else {
+                if (firstToken.range[1] === secondToken.range[0]) {
+                    context.report({
+                        node,
+                        messageId: "beforeUnaryExpressions",
+                        data: {
+                            token: secondToken.value
+                        },
+                        fix(fixer) {
+                            return fixer.insertTextBefore(secondToken, " ");
+                        }
+                    });
+                }
+            }
+        }
+
+        /**
+         * Verifies UnaryExpression, UpdateExpression and NewExpression don't have spaces before or after the operator
+         * @param {ASTnode} node AST node
+         * @param {Object} firstToken First token in the expression
+         * @param {Object} secondToken Second token in the expression
+         * @returns {void}
+         */
+        function verifyNonWordsDontHaveSpaces(node, firstToken, secondToken) {
+            if (node.prefix) {
+                if (secondToken.range[0] > firstToken.range[1]) {
+                    context.report({
+                        node,
+                        messageId: "unexpectedAfter",
+                        data: {
+                            operator: firstToken.value
+                        },
+                        fix(fixer) {
+                            if (astUtils.canTokensBeAdjacent(firstToken, secondToken)) {
+                                return fixer.removeRange([firstToken.range[1], secondToken.range[0]]);
+                            }
+                            return null;
+                        }
+                    });
+                }
+            } else {
+                if (secondToken.range[0] > firstToken.range[1]) {
+                    context.report({
+                        node,
+                        messageId: "unexpectedBefore",
+                        data: {
+                            operator: secondToken.value
+                        },
+                        fix(fixer) {
+                            return fixer.removeRange([firstToken.range[1], secondToken.range[0]]);
+                        }
+                    });
+                }
+            }
+        }
+
+        /**
+         * Verifies UnaryExpression, UpdateExpression and NewExpression satisfy spacing requirements
+         * @param {ASTnode} node AST node
+         * @returns {void}
+         */
+        function checkForSpaces(node) {
+            const tokens = node.type === "UpdateExpression" && !node.prefix
+                ? sourceCode.getLastTokens(node, 2)
+                : sourceCode.getFirstTokens(node, 2);
+            const firstToken = tokens[0];
+            const secondToken = tokens[1];
+
+            if ((node.type === "NewExpression" || node.prefix) && firstToken.type === "Keyword") {
+                checkUnaryWordOperatorForSpaces(node, firstToken, secondToken, firstToken.value);
+                return;
+            }
+
+            const operator = node.prefix ? tokens[0].value : tokens[1].value;
+
+            if (overrideExistsForOperator(operator)) {
+                if (overrideEnforcesSpaces(operator)) {
+                    verifyNonWordsHaveSpaces(node, firstToken, secondToken);
+                } else {
+                    verifyNonWordsDontHaveSpaces(node, firstToken, secondToken);
+                }
+            } else if (options.nonwords) {
+                verifyNonWordsHaveSpaces(node, firstToken, secondToken);
+            } else {
+                verifyNonWordsDontHaveSpaces(node, firstToken, secondToken);
+            }
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            UnaryExpression: checkForSpaces,
+            UpdateExpression: checkForSpaces,
+            NewExpression: checkForSpaces,
+            YieldExpression: checkForSpacesAfterYield,
+            AwaitExpression: checkForSpacesAfterAwait
+        };
+
+    }
+};