eslint-plugin-stylistic-compat/dist/rules/max-statements-per-line.js

Compatibility version of @stylistic/eslint-plugin for Node.js >= 12 and ESLint v8

'use strict';

var _includesInstanceProperty = require('@babel/runtime-corejs3/core-js/instance/includes');
var utils = require('../utils.js');
require('@babel/runtime-corejs3/core-js/object/from-entries');
require('@babel/runtime-corejs3/core-js/instance/map');
require('@babel/runtime-corejs3/core-js/instance/filter');
require('@babel/runtime-corejs3/core-js/object/entries');
require('@babel/runtime-corejs3/core-js/set');
require('@babel/runtime-corejs3/core-js/instance/flags');
require('@babel/runtime-corejs3/core-js/instance/starts-with');
require('../vendor.js');
require('@babel/runtime-corejs3/core-js/object/assign');
require('@babel/runtime-corejs3/core-js/object/create');
require('@babel/runtime-corejs3/core-js/object/freeze');
require('@babel/runtime-corejs3/core-js/array/is-array');
require('@babel/runtime-corejs3/core-js/instance/last-index-of');
require('@babel/runtime-corejs3/core-js/instance/slice');
require('@babel/runtime-corejs3/core-js/object/define-properties');
require('@babel/runtime-corejs3/core-js/object/keys');
require('@babel/runtime-corejs3/core-js/instance/index-of');
require('@babel/runtime-corejs3/core-js/instance/at');
require('@babel/runtime-corejs3/core-js/symbol');
require('@babel/runtime-corejs3/core-js/symbol/iterator');
require('@babel/runtime-corejs3/core-js/parse-int');
require('@babel/runtime-corejs3/core-js/parse-float');
require('@babel/runtime-corejs3/core-js/weak-map');
require('@babel/runtime-corejs3/core-js/object/define-property');
require('@babel/runtime-corejs3/core-js/global-this');
require('@babel/runtime-corejs3/core-js/instance/for-each');
require('@babel/runtime-corejs3/core-js/array/from');
require('eslint/use-at-your-own-risk');
require('eslint');
require('@babel/runtime-corejs3/core-js/object/get-own-property-descriptor');
require('@babel/runtime-corejs3/core-js/map');
require('@babel/runtime-corejs3/core-js/instance/some');
require('@babel/runtime-corejs3/core-js/instance/find');
require('@babel/runtime-corejs3/core-js/instance/every');
require('@babel/runtime-corejs3/core-js/instance/sort');
require('@babel/runtime-corejs3/core-js/array/of');
require('@babel/runtime-corejs3/core-js/instance/concat');
require('@babel/runtime-corejs3/core-js/instance/entries');
require('@babel/runtime-corejs3/core-js/instance/find-index');
require('@babel/runtime-corejs3/core-js/instance/flat');
require('@babel/runtime-corejs3/core-js/instance/keys');
require('@babel/runtime-corejs3/core-js/instance/values');
require('@babel/runtime-corejs3/core-js/object/get-own-property-names');
require('@babel/runtime-corejs3/core-js/number/is-finite');
require('@babel/runtime-corejs3/core-js/number/is-nan');
require('@babel/runtime-corejs3/core-js/number/parse-float');
require('@babel/runtime-corejs3/core-js/number/parse-int');
require('@babel/runtime-corejs3/core-js/object/is');
require('@babel/runtime-corejs3/core-js/object/is-extensible');
require('@babel/runtime-corejs3/core-js/object/is-frozen');
require('@babel/runtime-corejs3/core-js/object/is-sealed');
require('@babel/runtime-corejs3/core-js/object/values');
require('@babel/runtime-corejs3/core-js/string/from-code-point');
require('@babel/runtime-corejs3/core-js/string/raw');
require('@babel/runtime-corejs3/core-js/instance/code-point-at');
require('@babel/runtime-corejs3/core-js/instance/ends-with');
require('@babel/runtime-corejs3/core-js/instance/pad-end');
require('@babel/runtime-corejs3/core-js/instance/pad-start');
require('@babel/runtime-corejs3/core-js/instance/trim');
require('@babel/runtime-corejs3/core-js/instance/trim-end');
require('@babel/runtime-corejs3/core-js/instance/trim-left');
require('@babel/runtime-corejs3/core-js/instance/trim-right');
require('@babel/runtime-corejs3/core-js/instance/trim-start');
require('@babel/runtime-corejs3/core-js/symbol/for');
require('@babel/runtime-corejs3/core-js/symbol/key-for');
require('@babel/runtime-corejs3/core-js/object/prevent-extensions');
require('@babel/runtime-corejs3/core-js/object/seal');
require('@babel/runtime-corejs3/core-js/object/get-prototype-of');
require('@babel/runtime-corejs3/core-js/symbol/replace');
require('@babel/runtime-corejs3/core-js/instance/bind');
require('@babel/runtime-corejs3/core-js/instance/splice');
require('@babel/runtime-corejs3/core-js/instance/repeat');
require('@babel/runtime-corejs3/core-js/instance/reduce');
require('@babel/runtime-corejs3/core-js/instance/reverse');

const listeningNodes = ["BreakStatement", "ClassDeclaration", "ContinueStatement", "DebuggerStatement", "DoWhileStatement", "ExpressionStatement", "ForInStatement", "ForOfStatement", "ForStatement", "FunctionDeclaration", "IfStatement", "ImportDeclaration", "LabeledStatement", "ReturnStatement", "SwitchStatement", "ThrowStatement", "TryStatement", "VariableDeclaration", "WhileStatement", "WithStatement", "ExportNamedDeclaration", "ExportDefaultDeclaration", "ExportAllDeclaration"];
var maxStatementsPerLine = utils.createRule({
  name: "max-statements-per-line",
  package: "js",
  meta: {
    type: "layout",
    docs: {
      description: "Enforce a maximum number of statements allowed per line"
    },
    schema: [{
      type: "object",
      properties: {
        max: {
          type: "integer",
          minimum: 1,
          default: 1
        },
        ignoredNodes: {
          type: "array",
          items: {
            type: "string",
            enum: listeningNodes
          }
        }
      },
      additionalProperties: false
    }],
    messages: {
      exceed: "This line has {{numberOfStatementsOnThisLine}} {{statements}}. Maximum allowed is {{maxStatementsPerLine}}."
    }
  },
  create(context) {
    const sourceCode = context.sourceCode;
    const options = context.options[0] || {};
    const maxStatementsPerLine = typeof options.max !== "undefined" ? options.max : 1;
    const ignoredNodes = options.ignoredNodes || [];
    let lastStatementLine = 0;
    let numberOfStatementsOnThisLine = 0;
    let firstExtraStatement = null;
    const SINGLE_CHILD_ALLOWED = /^(?:(?:DoWhile|For|ForIn|ForOf|If|Labeled|While)Statement|Export(?:Default|Named)Declaration)$/u;
    function reportFirstExtraStatementAndClear() {
      if (firstExtraStatement) {
        context.report({
          node: firstExtraStatement,
          messageId: "exceed",
          data: {
            numberOfStatementsOnThisLine,
            maxStatementsPerLine,
            statements: numberOfStatementsOnThisLine === 1 ? "statement" : "statements"
          }
        });
      }
      firstExtraStatement = null;
    }
    function getActualLastToken(node) {
      return sourceCode.getLastToken(node, utils.isNotSemicolonToken);
    }
    function enterStatement(node) {
      const line = node.loc.start.line;
      if (node.parent && SINGLE_CHILD_ALLOWED.test(node.parent.type) && (!("alternate" in node.parent) || node.parent.alternate !== node)) {
        return;
      }
      if (line === lastStatementLine) {
        numberOfStatementsOnThisLine += 1;
      } else {
        reportFirstExtraStatementAndClear();
        numberOfStatementsOnThisLine = 1;
        lastStatementLine = line;
      }
      if (numberOfStatementsOnThisLine === maxStatementsPerLine + 1) firstExtraStatement = firstExtraStatement || node;
    }
    function leaveStatement(node) {
      const line = getActualLastToken(node).loc.end.line;
      if (line !== lastStatementLine) {
        reportFirstExtraStatementAndClear();
        numberOfStatementsOnThisLine = 1;
        lastStatementLine = line;
      }
    }
    const listeners = {
      "Program:exit": reportFirstExtraStatementAndClear
    };
    for (const node of listeningNodes) {
      if (_includesInstanceProperty(ignoredNodes).call(ignoredNodes, node)) continue;
      listeners[node] = enterStatement;
      listeners[`${node}:exit`] = leaveStatement;
    }
    return listeners;
  }
});

module.exports = maxStatementsPerLine;