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app_vue/node_modules/eslint/lib/rules/max-statements-per-line.js

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+/**
+ * @fileoverview Specify the maximum number of statements allowed per line.
+ * @author Kenneth Williams
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce a maximum number of statements allowed per line",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/max-statements-per-line"
+        },
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    max: {
+                        type: "integer",
+                        minimum: 1,
+                        default: 1
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+        messages: {
+            exceed: "This line has {{numberOfStatementsOnThisLine}} {{statements}}. Maximum allowed is {{maxStatementsPerLine}}."
+        }
+    },
+
+    create(context) {
+
+        const sourceCode = context.getSourceCode(),
+            options = context.options[0] || {},
+            maxStatementsPerLine = typeof options.max !== "undefined" ? options.max : 1;
+
+        let lastStatementLine = 0,
+            numberOfStatementsOnThisLine = 0,
+            firstExtraStatement;
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        const SINGLE_CHILD_ALLOWED = /^(?:(?:DoWhile|For|ForIn|ForOf|If|Labeled|While)Statement|Export(?:Default|Named)Declaration)$/u;
+
+        /**
+         * Reports with the first extra statement, and clears it.
+         * @returns {void}
+         */
+        function reportFirstExtraStatementAndClear() {
+            if (firstExtraStatement) {
+                context.report({
+                    node: firstExtraStatement,
+                    messageId: "exceed",
+                    data: {
+                        numberOfStatementsOnThisLine,
+                        maxStatementsPerLine,
+                        statements: numberOfStatementsOnThisLine === 1 ? "statement" : "statements"
+                    }
+                });
+            }
+            firstExtraStatement = null;
+        }
+
+        /**
+         * Gets the actual last token of a given node.
+         * @param {ASTNode} node A node to get. This is a node except EmptyStatement.
+         * @returns {Token} The actual last token.
+         */
+        function getActualLastToken(node) {
+            return sourceCode.getLastToken(node, astUtils.isNotSemicolonToken);
+        }
+
+        /**
+         * Addresses a given node.
+         * It updates the state of this rule, then reports the node if the node violated this rule.
+         * @param {ASTNode} node A node to check.
+         * @returns {void}
+         */
+        function enterStatement(node) {
+            const line = node.loc.start.line;
+
+            /*
+             * Skip to allow non-block statements if this is direct child of control statements.
+             * `if (a) foo();` is counted as 1.
+             * But `if (a) foo(); else foo();` should be counted as 2.
+             */
+            if (SINGLE_CHILD_ALLOWED.test(node.parent.type) &&
+                node.parent.alternate !== node
+            ) {
+                return;
+            }
+
+            // Update state.
+            if (line === lastStatementLine) {
+                numberOfStatementsOnThisLine += 1;
+            } else {
+                reportFirstExtraStatementAndClear();
+                numberOfStatementsOnThisLine = 1;
+                lastStatementLine = line;
+            }
+
+            // Reports if the node violated this rule.
+            if (numberOfStatementsOnThisLine === maxStatementsPerLine + 1) {
+                firstExtraStatement = firstExtraStatement || node;
+            }
+        }
+
+        /**
+         * Updates the state of this rule with the end line of leaving node to check with the next statement.
+         * @param {ASTNode} node A node to check.
+         * @returns {void}
+         */
+        function leaveStatement(node) {
+            const line = getActualLastToken(node).loc.end.line;
+
+            // Update state.
+            if (line !== lastStatementLine) {
+                reportFirstExtraStatementAndClear();
+                numberOfStatementsOnThisLine = 1;
+                lastStatementLine = line;
+            }
+        }
+
+        //--------------------------------------------------------------------------
+        // Public API
+        //--------------------------------------------------------------------------
+
+        return {
+            BreakStatement: enterStatement,
+            ClassDeclaration: enterStatement,
+            ContinueStatement: enterStatement,
+            DebuggerStatement: enterStatement,
+            DoWhileStatement: enterStatement,
+            ExpressionStatement: enterStatement,
+            ForInStatement: enterStatement,
+            ForOfStatement: enterStatement,
+            ForStatement: enterStatement,
+            FunctionDeclaration: enterStatement,
+            IfStatement: enterStatement,
+            ImportDeclaration: enterStatement,
+            LabeledStatement: enterStatement,
+            ReturnStatement: enterStatement,
+            SwitchStatement: enterStatement,
+            ThrowStatement: enterStatement,
+            TryStatement: enterStatement,
+            VariableDeclaration: enterStatement,
+            WhileStatement: enterStatement,
+            WithStatement: enterStatement,
+            ExportNamedDeclaration: enterStatement,
+            ExportDefaultDeclaration: enterStatement,
+            ExportAllDeclaration: enterStatement,
+
+            "BreakStatement:exit": leaveStatement,
+            "ClassDeclaration:exit": leaveStatement,
+            "ContinueStatement:exit": leaveStatement,
+            "DebuggerStatement:exit": leaveStatement,
+            "DoWhileStatement:exit": leaveStatement,
+            "ExpressionStatement:exit": leaveStatement,
+            "ForInStatement:exit": leaveStatement,
+            "ForOfStatement:exit": leaveStatement,
+            "ForStatement:exit": leaveStatement,
+            "FunctionDeclaration:exit": leaveStatement,
+            "IfStatement:exit": leaveStatement,
+            "ImportDeclaration:exit": leaveStatement,
+            "LabeledStatement:exit": leaveStatement,
+            "ReturnStatement:exit": leaveStatement,
+            "SwitchStatement:exit": leaveStatement,
+            "ThrowStatement:exit": leaveStatement,
+            "TryStatement:exit": leaveStatement,
+            "VariableDeclaration:exit": leaveStatement,
+            "WhileStatement:exit": leaveStatement,
+            "WithStatement:exit": leaveStatement,
+            "ExportNamedDeclaration:exit": leaveStatement,
+            "ExportDefaultDeclaration:exit": leaveStatement,
+            "ExportAllDeclaration:exit": leaveStatement,
+            "Program:exit": reportFirstExtraStatementAndClear
+        };
+    }
+};