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app_vue/node_modules/eslint/lib/rules/brace-style.js

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+/**
+ * @fileoverview Rule to flag block statements that do not use the one true brace style
+ * @author Ian Christian Myers
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent brace style for blocks",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/brace-style"
+        },
+
+        schema: [
+            {
+                enum: ["1tbs", "stroustrup", "allman"]
+            },
+            {
+                type: "object",
+                properties: {
+                    allowSingleLine: {
+                        type: "boolean",
+                        default: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        fixable: "whitespace",
+
+        messages: {
+            nextLineOpen: "Opening curly brace does not appear on the same line as controlling statement.",
+            sameLineOpen: "Opening curly brace appears on the same line as controlling statement.",
+            blockSameLine: "Statement inside of curly braces should be on next line.",
+            nextLineClose: "Closing curly brace does not appear on the same line as the subsequent block.",
+            singleLineClose: "Closing curly brace should be on the same line as opening curly brace or on the line after the previous block.",
+            sameLineClose: "Closing curly brace appears on the same line as the subsequent block."
+        }
+    },
+
+    create(context) {
+        const style = context.options[0] || "1tbs",
+            params = context.options[1] || {},
+            sourceCode = context.getSourceCode();
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Fixes a place where a newline unexpectedly appears
+         * @param {Token} firstToken The token before the unexpected newline
+         * @param {Token} secondToken The token after the unexpected newline
+         * @returns {Function} A fixer function to remove the newlines between the tokens
+         */
+        function removeNewlineBetween(firstToken, secondToken) {
+            const textRange = [firstToken.range[1], secondToken.range[0]];
+            const textBetween = sourceCode.text.slice(textRange[0], textRange[1]);
+
+            // Don't do a fix if there is a comment between the tokens
+            if (textBetween.trim()) {
+                return null;
+            }
+            return fixer => fixer.replaceTextRange(textRange, " ");
+        }
+
+        /**
+         * Validates a pair of curly brackets based on the user's config
+         * @param {Token} openingCurly The opening curly bracket
+         * @param {Token} closingCurly The closing curly bracket
+         * @returns {void}
+         */
+        function validateCurlyPair(openingCurly, closingCurly) {
+            const tokenBeforeOpeningCurly = sourceCode.getTokenBefore(openingCurly);
+            const tokenAfterOpeningCurly = sourceCode.getTokenAfter(openingCurly);
+            const tokenBeforeClosingCurly = sourceCode.getTokenBefore(closingCurly);
+            const singleLineException = params.allowSingleLine && astUtils.isTokenOnSameLine(openingCurly, closingCurly);
+
+            if (style !== "allman" && !astUtils.isTokenOnSameLine(tokenBeforeOpeningCurly, openingCurly)) {
+                context.report({
+                    node: openingCurly,
+                    messageId: "nextLineOpen",
+                    fix: removeNewlineBetween(tokenBeforeOpeningCurly, openingCurly)
+                });
+            }
+
+            if (style === "allman" && astUtils.isTokenOnSameLine(tokenBeforeOpeningCurly, openingCurly) && !singleLineException) {
+                context.report({
+                    node: openingCurly,
+                    messageId: "sameLineOpen",
+                    fix: fixer => fixer.insertTextBefore(openingCurly, "\n")
+                });
+            }
+
+            if (astUtils.isTokenOnSameLine(openingCurly, tokenAfterOpeningCurly) && tokenAfterOpeningCurly !== closingCurly && !singleLineException) {
+                context.report({
+                    node: openingCurly,
+                    messageId: "blockSameLine",
+                    fix: fixer => fixer.insertTextAfter(openingCurly, "\n")
+                });
+            }
+
+            if (tokenBeforeClosingCurly !== openingCurly && !singleLineException && astUtils.isTokenOnSameLine(tokenBeforeClosingCurly, closingCurly)) {
+                context.report({
+                    node: closingCurly,
+                    messageId: "singleLineClose",
+                    fix: fixer => fixer.insertTextBefore(closingCurly, "\n")
+                });
+            }
+        }
+
+        /**
+         * Validates the location of a token that appears before a keyword (e.g. a newline before `else`)
+         * @param {Token} curlyToken The closing curly token. This is assumed to precede a keyword token (such as `else` or `finally`).
+         * @returns {void}
+         */
+        function validateCurlyBeforeKeyword(curlyToken) {
+            const keywordToken = sourceCode.getTokenAfter(curlyToken);
+
+            if (style === "1tbs" && !astUtils.isTokenOnSameLine(curlyToken, keywordToken)) {
+                context.report({
+                    node: curlyToken,
+                    messageId: "nextLineClose",
+                    fix: removeNewlineBetween(curlyToken, keywordToken)
+                });
+            }
+
+            if (style !== "1tbs" && astUtils.isTokenOnSameLine(curlyToken, keywordToken)) {
+                context.report({
+                    node: curlyToken,
+                    messageId: "sameLineClose",
+                    fix: fixer => fixer.insertTextAfter(curlyToken, "\n")
+                });
+            }
+        }
+
+        //--------------------------------------------------------------------------
+        // Public API
+        //--------------------------------------------------------------------------
+
+        return {
+            BlockStatement(node) {
+                if (!astUtils.STATEMENT_LIST_PARENTS.has(node.parent.type)) {
+                    validateCurlyPair(sourceCode.getFirstToken(node), sourceCode.getLastToken(node));
+                }
+            },
+            ClassBody(node) {
+                validateCurlyPair(sourceCode.getFirstToken(node), sourceCode.getLastToken(node));
+            },
+            SwitchStatement(node) {
+                const closingCurly = sourceCode.getLastToken(node);
+                const openingCurly = sourceCode.getTokenBefore(node.cases.length ? node.cases[0] : closingCurly);
+
+                validateCurlyPair(openingCurly, closingCurly);
+            },
+            IfStatement(node) {
+                if (node.consequent.type === "BlockStatement" && node.alternate) {
+
+                    // Handle the keyword after the `if` block (before `else`)
+                    validateCurlyBeforeKeyword(sourceCode.getLastToken(node.consequent));
+                }
+            },
+            TryStatement(node) {
+
+                // Handle the keyword after the `try` block (before `catch` or `finally`)
+                validateCurlyBeforeKeyword(sourceCode.getLastToken(node.block));
+
+                if (node.handler && node.finalizer) {
+
+                    // Handle the keyword after the `catch` block (before `finally`)
+                    validateCurlyBeforeKeyword(sourceCode.getLastToken(node.handler.body));
+                }
+            }
+        };
+    }
+};