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app_vue/node_modules/eslint/lib/rules/nonblock-statement-body-position.js

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+/**
+ * @fileoverview enforce the location of single-line statements
+ * @author Teddy Katz
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+const POSITION_SCHEMA = { enum: ["beside", "below", "any"] };
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce the location of single-line statements",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/nonblock-statement-body-position"
+        },
+
+        fixable: "whitespace",
+
+        schema: [
+            POSITION_SCHEMA,
+            {
+                properties: {
+                    overrides: {
+                        properties: {
+                            if: POSITION_SCHEMA,
+                            else: POSITION_SCHEMA,
+                            while: POSITION_SCHEMA,
+                            do: POSITION_SCHEMA,
+                            for: POSITION_SCHEMA
+                        },
+                        additionalProperties: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            expectNoLinebreak: "Expected no linebreak before this statement.",
+            expectLinebreak: "Expected a linebreak before this statement."
+        }
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+        //----------------------------------------------------------------------
+        // Helpers
+        //----------------------------------------------------------------------
+
+        /**
+         * Gets the applicable preference for a particular keyword
+         * @param {string} keywordName The name of a keyword, e.g. 'if'
+         * @returns {string} The applicable option for the keyword, e.g. 'beside'
+         */
+        function getOption(keywordName) {
+            return context.options[1] && context.options[1].overrides && context.options[1].overrides[keywordName] ||
+                context.options[0] ||
+                "beside";
+        }
+
+        /**
+         * Validates the location of a single-line statement
+         * @param {ASTNode} node The single-line statement
+         * @param {string} keywordName The applicable keyword name for the single-line statement
+         * @returns {void}
+         */
+        function validateStatement(node, keywordName) {
+            const option = getOption(keywordName);
+
+            if (node.type === "BlockStatement" || option === "any") {
+                return;
+            }
+
+            const tokenBefore = sourceCode.getTokenBefore(node);
+
+            if (tokenBefore.loc.end.line === node.loc.start.line && option === "below") {
+                context.report({
+                    node,
+                    messageId: "expectLinebreak",
+                    fix: fixer => fixer.insertTextBefore(node, "\n")
+                });
+            } else if (tokenBefore.loc.end.line !== node.loc.start.line && option === "beside") {
+                context.report({
+                    node,
+                    messageId: "expectNoLinebreak",
+                    fix(fixer) {
+                        if (sourceCode.getText().slice(tokenBefore.range[1], node.range[0]).trim()) {
+                            return null;
+                        }
+                        return fixer.replaceTextRange([tokenBefore.range[1], node.range[0]], " ");
+                    }
+                });
+            }
+        }
+
+        //----------------------------------------------------------------------
+        // Public
+        //----------------------------------------------------------------------
+
+        return {
+            IfStatement(node) {
+                validateStatement(node.consequent, "if");
+
+                // Check the `else` node, but don't check 'else if' statements.
+                if (node.alternate && node.alternate.type !== "IfStatement") {
+                    validateStatement(node.alternate, "else");
+                }
+            },
+            WhileStatement: node => validateStatement(node.body, "while"),
+            DoWhileStatement: node => validateStatement(node.body, "do"),
+            ForStatement: node => validateStatement(node.body, "for"),
+            ForInStatement: node => validateStatement(node.body, "for"),
+            ForOfStatement: node => validateStatement(node.body, "for")
+        };
+    }
+};