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app_vue/node_modules/eslint/lib/rules/space-before-blocks.js

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+/**
+ * @fileoverview A rule to ensure whitespace before blocks.
+ * @author Mathias Schreck <https://github.com/lo1tuma>
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Checks whether the given node represents the body of a function.
+ * @param {ASTNode} node the node to check.
+ * @returns {boolean} `true` if the node is function body.
+ */
+function isFunctionBody(node) {
+    const parent = node.parent;
+
+    return (
+        node.type === "BlockStatement" &&
+        astUtils.isFunction(parent) &&
+        parent.body === node
+    );
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce consistent spacing before blocks",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/space-before-blocks"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        enum: ["always", "never"]
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            keywords: {
+                                enum: ["always", "never", "off"]
+                            },
+                            functions: {
+                                enum: ["always", "never", "off"]
+                            },
+                            classes: {
+                                enum: ["always", "never", "off"]
+                            }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ],
+
+        messages: {
+            unexpectedSpace: "Unexpected space before opening brace.",
+            missingSpace: "Missing space before opening brace."
+        }
+    },
+
+    create(context) {
+        const config = context.options[0],
+            sourceCode = context.getSourceCode();
+        let alwaysFunctions = true,
+            alwaysKeywords = true,
+            alwaysClasses = true,
+            neverFunctions = false,
+            neverKeywords = false,
+            neverClasses = false;
+
+        if (typeof config === "object") {
+            alwaysFunctions = config.functions === "always";
+            alwaysKeywords = config.keywords === "always";
+            alwaysClasses = config.classes === "always";
+            neverFunctions = config.functions === "never";
+            neverKeywords = config.keywords === "never";
+            neverClasses = config.classes === "never";
+        } else if (config === "never") {
+            alwaysFunctions = false;
+            alwaysKeywords = false;
+            alwaysClasses = false;
+            neverFunctions = true;
+            neverKeywords = true;
+            neverClasses = true;
+        }
+
+        /**
+         * Checks whether the spacing before the given block is already controlled by another rule:
+         * - `arrow-spacing` checks spaces after `=>`.
+         * - `keyword-spacing` checks spaces after keywords in certain contexts.
+         * @param {Token} precedingToken first token before the block.
+         * @param {ASTNode|Token} node `BlockStatement` node or `{` token of a `SwitchStatement` node.
+         * @returns {boolean} `true` if requiring or disallowing spaces before the given block could produce conflicts with other rules.
+         */
+        function isConflicted(precedingToken, node) {
+            return astUtils.isArrowToken(precedingToken) ||
+                astUtils.isKeywordToken(precedingToken) && !isFunctionBody(node);
+        }
+
+        /**
+         * Checks the given BlockStatement node has a preceding space if it doesn’t start on a new line.
+         * @param {ASTNode|Token} node The AST node of a BlockStatement.
+         * @returns {void} undefined.
+         */
+        function checkPrecedingSpace(node) {
+            const precedingToken = sourceCode.getTokenBefore(node);
+
+            if (precedingToken && !isConflicted(precedingToken, node) && astUtils.isTokenOnSameLine(precedingToken, node)) {
+                const hasSpace = sourceCode.isSpaceBetweenTokens(precedingToken, node);
+                let requireSpace;
+                let requireNoSpace;
+
+                if (isFunctionBody(node)) {
+                    requireSpace = alwaysFunctions;
+                    requireNoSpace = neverFunctions;
+                } else if (node.type === "ClassBody") {
+                    requireSpace = alwaysClasses;
+                    requireNoSpace = neverClasses;
+                } else {
+                    requireSpace = alwaysKeywords;
+                    requireNoSpace = neverKeywords;
+                }
+
+                if (requireSpace && !hasSpace) {
+                    context.report({
+                        node,
+                        messageId: "missingSpace",
+                        fix(fixer) {
+                            return fixer.insertTextBefore(node, " ");
+                        }
+                    });
+                } else if (requireNoSpace && hasSpace) {
+                    context.report({
+                        node,
+                        messageId: "unexpectedSpace",
+                        fix(fixer) {
+                            return fixer.removeRange([precedingToken.range[1], node.range[0]]);
+                        }
+                    });
+                }
+            }
+        }
+
+        /**
+         * Checks if the CaseBlock of an given SwitchStatement node has a preceding space.
+         * @param {ASTNode} node The node of a SwitchStatement.
+         * @returns {void} undefined.
+         */
+        function checkSpaceBeforeCaseBlock(node) {
+            const cases = node.cases;
+            let openingBrace;
+
+            if (cases.length > 0) {
+                openingBrace = sourceCode.getTokenBefore(cases[0]);
+            } else {
+                openingBrace = sourceCode.getLastToken(node, 1);
+            }
+
+            checkPrecedingSpace(openingBrace);
+        }
+
+        return {
+            BlockStatement: checkPrecedingSpace,
+            ClassBody: checkPrecedingSpace,
+            SwitchStatement: checkSpaceBeforeCaseBlock
+        };
+
+    }
+};