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app_vue/node_modules/eslint/lib/rules/keyword-spacing.js

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+/**
+ * @fileoverview Rule to enforce spacing before and after keywords.
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils"),
+    keywords = require("./utils/keywords");
+
+//------------------------------------------------------------------------------
+// Constants
+//------------------------------------------------------------------------------
+
+const PREV_TOKEN = /^[)\]}>]$/u;
+const NEXT_TOKEN = /^(?:[([{<~!]|\+\+?|--?)$/u;
+const PREV_TOKEN_M = /^[)\]}>*]$/u;
+const NEXT_TOKEN_M = /^[{*]$/u;
+const TEMPLATE_OPEN_PAREN = /\$\{$/u;
+const TEMPLATE_CLOSE_PAREN = /^\}/u;
+const CHECK_TYPE = /^(?:JSXElement|RegularExpression|String|Template)$/u;
+const KEYS = keywords.concat(["as", "async", "await", "from", "get", "let", "of", "set", "yield"]);
+
+// check duplications.
+(function() {
+    KEYS.sort();
+    for (let i = 1; i < KEYS.length; ++i) {
+        if (KEYS[i] === KEYS[i - 1]) {
+            throw new Error(`Duplication was found in the keyword list: ${KEYS[i]}`);
+        }
+    }
+}());
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether or not a given token is a "Template" token ends with "${".
+ * @param {Token} token A token to check.
+ * @returns {boolean} `true` if the token is a "Template" token ends with "${".
+ */
+function isOpenParenOfTemplate(token) {
+    return token.type === "Template" && TEMPLATE_OPEN_PAREN.test(token.value);
+}
+
+/**
+ * Checks whether or not a given token is a "Template" token starts with "}".
+ * @param {Token} token A token to check.
+ * @returns {boolean} `true` if the token is a "Template" token starts with "}".
+ */
+function isCloseParenOfTemplate(token) {
+    return token.type === "Template" && TEMPLATE_CLOSE_PAREN.test(token.value);
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent spacing before and after keywords",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/keyword-spacing"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    before: { type: "boolean", default: true },
+                    after: { type: "boolean", default: true },
+                    overrides: {
+                        type: "object",
+                        properties: KEYS.reduce((retv, key) => {
+                            retv[key] = {
+                                type: "object",
+                                properties: {
+                                    before: { type: "boolean" },
+                                    after: { type: "boolean" }
+                                },
+                                additionalProperties: false
+                            };
+                            return retv;
+                        }, {}),
+                        additionalProperties: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+        messages: {
+            expectedBefore: "Expected space(s) before \"{{value}}\".",
+            expectedAfter: "Expected space(s) after \"{{value}}\".",
+            unexpectedBefore: "Unexpected space(s) before \"{{value}}\".",
+            unexpectedAfter: "Unexpected space(s) after \"{{value}}\"."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Reports a given token if there are not space(s) before the token.
+         * @param {Token} token A token to report.
+         * @param {RegExp} pattern A pattern of the previous token to check.
+         * @returns {void}
+         */
+        function expectSpaceBefore(token, pattern) {
+            const prevToken = sourceCode.getTokenBefore(token);
+
+            if (prevToken &&
+                (CHECK_TYPE.test(prevToken.type) || pattern.test(prevToken.value)) &&
+                !isOpenParenOfTemplate(prevToken) &&
+                astUtils.isTokenOnSameLine(prevToken, token) &&
+                !sourceCode.isSpaceBetweenTokens(prevToken, token)
+            ) {
+                context.report({
+                    loc: token.loc,
+                    messageId: "expectedBefore",
+                    data: token,
+                    fix(fixer) {
+                        return fixer.insertTextBefore(token, " ");
+                    }
+                });
+            }
+        }
+
+        /**
+         * Reports a given token if there are space(s) before the token.
+         * @param {Token} token A token to report.
+         * @param {RegExp} pattern A pattern of the previous token to check.
+         * @returns {void}
+         */
+        function unexpectSpaceBefore(token, pattern) {
+            const prevToken = sourceCode.getTokenBefore(token);
+
+            if (prevToken &&
+                (CHECK_TYPE.test(prevToken.type) || pattern.test(prevToken.value)) &&
+                !isOpenParenOfTemplate(prevToken) &&
+                astUtils.isTokenOnSameLine(prevToken, token) &&
+                sourceCode.isSpaceBetweenTokens(prevToken, token)
+            ) {
+                context.report({
+                    loc: { start: prevToken.loc.end, end: token.loc.start },
+                    messageId: "unexpectedBefore",
+                    data: token,
+                    fix(fixer) {
+                        return fixer.removeRange([prevToken.range[1], token.range[0]]);
+                    }
+                });
+            }
+        }
+
+        /**
+         * Reports a given token if there are not space(s) after the token.
+         * @param {Token} token A token to report.
+         * @param {RegExp} pattern A pattern of the next token to check.
+         * @returns {void}
+         */
+        function expectSpaceAfter(token, pattern) {
+            const nextToken = sourceCode.getTokenAfter(token);
+
+            if (nextToken &&
+                (CHECK_TYPE.test(nextToken.type) || pattern.test(nextToken.value)) &&
+                !isCloseParenOfTemplate(nextToken) &&
+                astUtils.isTokenOnSameLine(token, nextToken) &&
+                !sourceCode.isSpaceBetweenTokens(token, nextToken)
+            ) {
+                context.report({
+                    loc: token.loc,
+                    messageId: "expectedAfter",
+                    data: token,
+                    fix(fixer) {
+                        return fixer.insertTextAfter(token, " ");
+                    }
+                });
+            }
+        }
+
+        /**
+         * Reports a given token if there are space(s) after the token.
+         * @param {Token} token A token to report.
+         * @param {RegExp} pattern A pattern of the next token to check.
+         * @returns {void}
+         */
+        function unexpectSpaceAfter(token, pattern) {
+            const nextToken = sourceCode.getTokenAfter(token);
+
+            if (nextToken &&
+                (CHECK_TYPE.test(nextToken.type) || pattern.test(nextToken.value)) &&
+                !isCloseParenOfTemplate(nextToken) &&
+                astUtils.isTokenOnSameLine(token, nextToken) &&
+                sourceCode.isSpaceBetweenTokens(token, nextToken)
+            ) {
+
+                context.report({
+                    loc: { start: token.loc.end, end: nextToken.loc.start },
+                    messageId: "unexpectedAfter",
+                    data: token,
+                    fix(fixer) {
+                        return fixer.removeRange([token.range[1], nextToken.range[0]]);
+                    }
+                });
+            }
+        }
+
+        /**
+         * Parses the option object and determines check methods for each keyword.
+         * @param {Object|undefined} options The option object to parse.
+         * @returns {Object} - Normalized option object.
+         *      Keys are keywords (there are for every keyword).
+         *      Values are instances of `{"before": function, "after": function}`.
+         */
+        function parseOptions(options = {}) {
+            const before = options.before !== false;
+            const after = options.after !== false;
+            const defaultValue = {
+                before: before ? expectSpaceBefore : unexpectSpaceBefore,
+                after: after ? expectSpaceAfter : unexpectSpaceAfter
+            };
+            const overrides = (options && options.overrides) || {};
+            const retv = Object.create(null);
+
+            for (let i = 0; i < KEYS.length; ++i) {
+                const key = KEYS[i];
+                const override = overrides[key];
+
+                if (override) {
+                    const thisBefore = ("before" in override) ? override.before : before;
+                    const thisAfter = ("after" in override) ? override.after : after;
+
+                    retv[key] = {
+                        before: thisBefore ? expectSpaceBefore : unexpectSpaceBefore,
+                        after: thisAfter ? expectSpaceAfter : unexpectSpaceAfter
+                    };
+                } else {
+                    retv[key] = defaultValue;
+                }
+            }
+
+            return retv;
+        }
+
+        const checkMethodMap = parseOptions(context.options[0]);
+
+        /**
+         * Reports a given token if usage of spacing followed by the token is
+         * invalid.
+         * @param {Token} token A token to report.
+         * @param {RegExp} [pattern] Optional. A pattern of the previous
+         *      token to check.
+         * @returns {void}
+         */
+        function checkSpacingBefore(token, pattern) {
+            checkMethodMap[token.value].before(token, pattern || PREV_TOKEN);
+        }
+
+        /**
+         * Reports a given token if usage of spacing preceded by the token is
+         * invalid.
+         * @param {Token} token A token to report.
+         * @param {RegExp} [pattern] Optional. A pattern of the next
+         *      token to check.
+         * @returns {void}
+         */
+        function checkSpacingAfter(token, pattern) {
+            checkMethodMap[token.value].after(token, pattern || NEXT_TOKEN);
+        }
+
+        /**
+         * Reports a given token if usage of spacing around the token is invalid.
+         * @param {Token} token A token to report.
+         * @returns {void}
+         */
+        function checkSpacingAround(token) {
+            checkSpacingBefore(token);
+            checkSpacingAfter(token);
+        }
+
+        /**
+         * Reports the first token of a given node if the first token is a keyword
+         * and usage of spacing around the token is invalid.
+         * @param {ASTNode|null} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingAroundFirstToken(node) {
+            const firstToken = node && sourceCode.getFirstToken(node);
+
+            if (firstToken && firstToken.type === "Keyword") {
+                checkSpacingAround(firstToken);
+            }
+        }
+
+        /**
+         * Reports the first token of a given node if the first token is a keyword
+         * and usage of spacing followed by the token is invalid.
+         *
+         * This is used for unary operators (e.g. `typeof`), `function`, and `super`.
+         * Other rules are handling usage of spacing preceded by those keywords.
+         * @param {ASTNode|null} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingBeforeFirstToken(node) {
+            const firstToken = node && sourceCode.getFirstToken(node);
+
+            if (firstToken && firstToken.type === "Keyword") {
+                checkSpacingBefore(firstToken);
+            }
+        }
+
+        /**
+         * Reports the previous token of a given node if the token is a keyword and
+         * usage of spacing around the token is invalid.
+         * @param {ASTNode|null} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingAroundTokenBefore(node) {
+            if (node) {
+                const token = sourceCode.getTokenBefore(node, astUtils.isKeywordToken);
+
+                checkSpacingAround(token);
+            }
+        }
+
+        /**
+         * Reports `async` or `function` keywords of a given node if usage of
+         * spacing around those keywords is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForFunction(node) {
+            const firstToken = node && sourceCode.getFirstToken(node);
+
+            if (firstToken &&
+                ((firstToken.type === "Keyword" && firstToken.value === "function") ||
+                firstToken.value === "async")
+            ) {
+                checkSpacingBefore(firstToken);
+            }
+        }
+
+        /**
+         * Reports `class` and `extends` keywords of a given node if usage of
+         * spacing around those keywords is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForClass(node) {
+            checkSpacingAroundFirstToken(node);
+            checkSpacingAroundTokenBefore(node.superClass);
+        }
+
+        /**
+         * Reports `if` and `else` keywords of a given node if usage of spacing
+         * around those keywords is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForIfStatement(node) {
+            checkSpacingAroundFirstToken(node);
+            checkSpacingAroundTokenBefore(node.alternate);
+        }
+
+        /**
+         * Reports `try`, `catch`, and `finally` keywords of a given node if usage
+         * of spacing around those keywords is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForTryStatement(node) {
+            checkSpacingAroundFirstToken(node);
+            checkSpacingAroundFirstToken(node.handler);
+            checkSpacingAroundTokenBefore(node.finalizer);
+        }
+
+        /**
+         * Reports `do` and `while` keywords of a given node if usage of spacing
+         * around those keywords is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForDoWhileStatement(node) {
+            checkSpacingAroundFirstToken(node);
+            checkSpacingAroundTokenBefore(node.test);
+        }
+
+        /**
+         * Reports `for` and `in` keywords of a given node if usage of spacing
+         * around those keywords is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForForInStatement(node) {
+            checkSpacingAroundFirstToken(node);
+            checkSpacingAroundTokenBefore(node.right);
+        }
+
+        /**
+         * Reports `for` and `of` keywords of a given node if usage of spacing
+         * around those keywords is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForForOfStatement(node) {
+            if (node.await) {
+                checkSpacingBefore(sourceCode.getFirstToken(node, 0));
+                checkSpacingAfter(sourceCode.getFirstToken(node, 1));
+            } else {
+                checkSpacingAroundFirstToken(node);
+            }
+            checkSpacingAround(sourceCode.getTokenBefore(node.right, astUtils.isNotOpeningParenToken));
+        }
+
+        /**
+         * Reports `import`, `export`, `as`, and `from` keywords of a given node if
+         * usage of spacing around those keywords is invalid.
+         *
+         * This rule handles the `*` token in module declarations.
+         *
+         *     import*as A from "./a"; /*error Expected space(s) after "import".
+         *                               error Expected space(s) before "as".
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForModuleDeclaration(node) {
+            const firstToken = sourceCode.getFirstToken(node);
+
+            checkSpacingBefore(firstToken, PREV_TOKEN_M);
+            checkSpacingAfter(firstToken, NEXT_TOKEN_M);
+
+            if (node.type === "ExportDefaultDeclaration") {
+                checkSpacingAround(sourceCode.getTokenAfter(firstToken));
+            }
+
+            if (node.type === "ExportAllDeclaration" && node.exported) {
+                const asToken = sourceCode.getTokenBefore(node.exported);
+
+                checkSpacingBefore(asToken, PREV_TOKEN_M);
+            }
+
+            if (node.source) {
+                const fromToken = sourceCode.getTokenBefore(node.source);
+
+                checkSpacingBefore(fromToken, PREV_TOKEN_M);
+                checkSpacingAfter(fromToken, NEXT_TOKEN_M);
+            }
+        }
+
+        /**
+         * Reports `as` keyword of a given node if usage of spacing around this
+         * keyword is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForImportNamespaceSpecifier(node) {
+            const asToken = sourceCode.getFirstToken(node, 1);
+
+            checkSpacingBefore(asToken, PREV_TOKEN_M);
+        }
+
+        /**
+         * Reports `static`, `get`, and `set` keywords of a given node if usage of
+         * spacing around those keywords is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForProperty(node) {
+            if (node.static) {
+                checkSpacingAroundFirstToken(node);
+            }
+            if (node.kind === "get" ||
+                node.kind === "set" ||
+                (
+                    (node.method || node.type === "MethodDefinition") &&
+                    node.value.async
+                )
+            ) {
+                const token = sourceCode.getTokenBefore(
+                    node.key,
+                    tok => {
+                        switch (tok.value) {
+                            case "get":
+                            case "set":
+                            case "async":
+                                return true;
+                            default:
+                                return false;
+                        }
+                    }
+                );
+
+                if (!token) {
+                    throw new Error("Failed to find token get, set, or async beside method name");
+                }
+
+
+                checkSpacingAround(token);
+            }
+        }
+
+        /**
+         * Reports `await` keyword of a given node if usage of spacing before
+         * this keyword is invalid.
+         * @param {ASTNode} node A node to report.
+         * @returns {void}
+         */
+        function checkSpacingForAwaitExpression(node) {
+            checkSpacingBefore(sourceCode.getFirstToken(node));
+        }
+
+        return {
+
+            // Statements
+            DebuggerStatement: checkSpacingAroundFirstToken,
+            WithStatement: checkSpacingAroundFirstToken,
+
+            // Statements - Control flow
+            BreakStatement: checkSpacingAroundFirstToken,
+            ContinueStatement: checkSpacingAroundFirstToken,
+            ReturnStatement: checkSpacingAroundFirstToken,
+            ThrowStatement: checkSpacingAroundFirstToken,
+            TryStatement: checkSpacingForTryStatement,
+
+            // Statements - Choice
+            IfStatement: checkSpacingForIfStatement,
+            SwitchStatement: checkSpacingAroundFirstToken,
+            SwitchCase: checkSpacingAroundFirstToken,
+
+            // Statements - Loops
+            DoWhileStatement: checkSpacingForDoWhileStatement,
+            ForInStatement: checkSpacingForForInStatement,
+            ForOfStatement: checkSpacingForForOfStatement,
+            ForStatement: checkSpacingAroundFirstToken,
+            WhileStatement: checkSpacingAroundFirstToken,
+
+            // Statements - Declarations
+            ClassDeclaration: checkSpacingForClass,
+            ExportNamedDeclaration: checkSpacingForModuleDeclaration,
+            ExportDefaultDeclaration: checkSpacingForModuleDeclaration,
+            ExportAllDeclaration: checkSpacingForModuleDeclaration,
+            FunctionDeclaration: checkSpacingForFunction,
+            ImportDeclaration: checkSpacingForModuleDeclaration,
+            VariableDeclaration: checkSpacingAroundFirstToken,
+
+            // Expressions
+            ArrowFunctionExpression: checkSpacingForFunction,
+            AwaitExpression: checkSpacingForAwaitExpression,
+            ClassExpression: checkSpacingForClass,
+            FunctionExpression: checkSpacingForFunction,
+            NewExpression: checkSpacingBeforeFirstToken,
+            Super: checkSpacingBeforeFirstToken,
+            ThisExpression: checkSpacingBeforeFirstToken,
+            UnaryExpression: checkSpacingBeforeFirstToken,
+            YieldExpression: checkSpacingBeforeFirstToken,
+
+            // Others
+            ImportNamespaceSpecifier: checkSpacingForImportNamespaceSpecifier,
+            MethodDefinition: checkSpacingForProperty,
+            Property: checkSpacingForProperty
+        };
+    }
+};