1704 lines
72 KiB
JavaScript
1704 lines
72 KiB
JavaScript
/**
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* @fileoverview This rule sets a specific indentation style and width for your code
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*
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* @author Teddy Katz
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* @author Vitaly Puzrin
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* @author Gyandeep Singh
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const createTree = require("functional-red-black-tree");
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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const KNOWN_NODES = new Set([
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"AssignmentExpression",
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"AssignmentPattern",
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"ArrayExpression",
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"ArrayPattern",
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"ArrowFunctionExpression",
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"AwaitExpression",
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"BlockStatement",
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"BinaryExpression",
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"BreakStatement",
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"CallExpression",
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"CatchClause",
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"ChainExpression",
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"ClassBody",
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"ClassDeclaration",
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"ClassExpression",
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"ConditionalExpression",
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"ContinueStatement",
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"DoWhileStatement",
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"DebuggerStatement",
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"EmptyStatement",
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"ExperimentalRestProperty",
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"ExperimentalSpreadProperty",
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"ExpressionStatement",
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"ForStatement",
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"ForInStatement",
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"ForOfStatement",
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"FunctionDeclaration",
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"FunctionExpression",
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"Identifier",
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"IfStatement",
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"Literal",
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"LabeledStatement",
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"LogicalExpression",
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"MemberExpression",
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"MetaProperty",
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"MethodDefinition",
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"NewExpression",
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"ObjectExpression",
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"ObjectPattern",
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"Program",
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"Property",
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"RestElement",
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"ReturnStatement",
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"SequenceExpression",
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"SpreadElement",
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"Super",
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"SwitchCase",
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"SwitchStatement",
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"TaggedTemplateExpression",
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"TemplateElement",
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"TemplateLiteral",
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"ThisExpression",
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"ThrowStatement",
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"TryStatement",
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"UnaryExpression",
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"UpdateExpression",
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"VariableDeclaration",
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"VariableDeclarator",
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"WhileStatement",
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"WithStatement",
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"YieldExpression",
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"JSXFragment",
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"JSXOpeningFragment",
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"JSXClosingFragment",
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"JSXIdentifier",
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"JSXNamespacedName",
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"JSXMemberExpression",
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"JSXEmptyExpression",
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"JSXExpressionContainer",
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"JSXElement",
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"JSXClosingElement",
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"JSXOpeningElement",
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"JSXAttribute",
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"JSXSpreadAttribute",
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"JSXText",
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"ExportDefaultDeclaration",
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"ExportNamedDeclaration",
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"ExportAllDeclaration",
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"ExportSpecifier",
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"ImportDeclaration",
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"ImportSpecifier",
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"ImportDefaultSpecifier",
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"ImportNamespaceSpecifier",
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"ImportExpression"
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]);
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/*
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* General rule strategy:
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* 1. An OffsetStorage instance stores a map of desired offsets, where each token has a specified offset from another
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* specified token or to the first column.
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* 2. As the AST is traversed, modify the desired offsets of tokens accordingly. For example, when entering a
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* BlockStatement, offset all of the tokens in the BlockStatement by 1 indent level from the opening curly
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* brace of the BlockStatement.
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* 3. After traversing the AST, calculate the expected indentation levels of every token according to the
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* OffsetStorage container.
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* 4. For each line, compare the expected indentation of the first token to the actual indentation in the file,
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* and report the token if the two values are not equal.
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*/
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/**
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* A mutable balanced binary search tree that stores (key, value) pairs. The keys are numeric, and must be unique.
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* This is intended to be a generic wrapper around a balanced binary search tree library, so that the underlying implementation
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* can easily be swapped out.
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*/
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class BinarySearchTree {
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/**
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* Creates an empty tree
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*/
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constructor() {
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this._rbTree = createTree();
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}
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/**
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* Inserts an entry into the tree.
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* @param {number} key The entry's key
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* @param {*} value The entry's value
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* @returns {void}
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*/
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insert(key, value) {
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const iterator = this._rbTree.find(key);
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if (iterator.valid) {
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this._rbTree = iterator.update(value);
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} else {
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this._rbTree = this._rbTree.insert(key, value);
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}
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}
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/**
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* Finds the entry with the largest key less than or equal to the provided key
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* @param {number} key The provided key
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* @returns {{key: number, value: *}|null} The found entry, or null if no such entry exists.
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*/
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findLe(key) {
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const iterator = this._rbTree.le(key);
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return iterator && { key: iterator.key, value: iterator.value };
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}
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/**
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* Deletes all of the keys in the interval [start, end)
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* @param {number} start The start of the range
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* @param {number} end The end of the range
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* @returns {void}
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*/
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deleteRange(start, end) {
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// Exit without traversing the tree if the range has zero size.
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if (start === end) {
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return;
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}
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const iterator = this._rbTree.ge(start);
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while (iterator.valid && iterator.key < end) {
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this._rbTree = this._rbTree.remove(iterator.key);
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iterator.next();
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}
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}
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}
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/**
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* A helper class to get token-based info related to indentation
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*/
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class TokenInfo {
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// eslint-disable-next-line jsdoc/require-description
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/**
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* @param {SourceCode} sourceCode A SourceCode object
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*/
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constructor(sourceCode) {
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this.sourceCode = sourceCode;
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this.firstTokensByLineNumber = sourceCode.tokensAndComments.reduce((map, token) => {
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if (!map.has(token.loc.start.line)) {
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map.set(token.loc.start.line, token);
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}
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if (!map.has(token.loc.end.line) && sourceCode.text.slice(token.range[1] - token.loc.end.column, token.range[1]).trim()) {
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map.set(token.loc.end.line, token);
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}
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return map;
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}, new Map());
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}
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/**
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* Gets the first token on a given token's line
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* @param {Token|ASTNode} token a node or token
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* @returns {Token} The first token on the given line
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*/
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getFirstTokenOfLine(token) {
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return this.firstTokensByLineNumber.get(token.loc.start.line);
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}
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/**
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* Determines whether a token is the first token in its line
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* @param {Token} token The token
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* @returns {boolean} `true` if the token is the first on its line
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*/
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isFirstTokenOfLine(token) {
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return this.getFirstTokenOfLine(token) === token;
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}
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/**
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* Get the actual indent of a token
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* @param {Token} token Token to examine. This should be the first token on its line.
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* @returns {string} The indentation characters that precede the token
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*/
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getTokenIndent(token) {
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return this.sourceCode.text.slice(token.range[0] - token.loc.start.column, token.range[0]);
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}
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}
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/**
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* A class to store information on desired offsets of tokens from each other
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*/
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class OffsetStorage {
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// eslint-disable-next-line jsdoc/require-description
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/**
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* @param {TokenInfo} tokenInfo a TokenInfo instance
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* @param {number} indentSize The desired size of each indentation level
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* @param {string} indentType The indentation character
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*/
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constructor(tokenInfo, indentSize, indentType) {
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this._tokenInfo = tokenInfo;
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this._indentSize = indentSize;
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this._indentType = indentType;
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this._tree = new BinarySearchTree();
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this._tree.insert(0, { offset: 0, from: null, force: false });
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this._lockedFirstTokens = new WeakMap();
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this._desiredIndentCache = new WeakMap();
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this._ignoredTokens = new WeakSet();
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}
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_getOffsetDescriptor(token) {
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return this._tree.findLe(token.range[0]).value;
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}
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/**
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* Sets the offset column of token B to match the offset column of token A.
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* **WARNING**: This matches a *column*, even if baseToken is not the first token on its line. In
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* most cases, `setDesiredOffset` should be used instead.
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* @param {Token} baseToken The first token
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* @param {Token} offsetToken The second token, whose offset should be matched to the first token
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* @returns {void}
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*/
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matchOffsetOf(baseToken, offsetToken) {
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/*
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* lockedFirstTokens is a map from a token whose indentation is controlled by the "first" option to
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* the token that it depends on. For example, with the `ArrayExpression: first` option, the first
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* token of each element in the array after the first will be mapped to the first token of the first
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* element. The desired indentation of each of these tokens is computed based on the desired indentation
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* of the "first" element, rather than through the normal offset mechanism.
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*/
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this._lockedFirstTokens.set(offsetToken, baseToken);
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}
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/**
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* Sets the desired offset of a token.
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*
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* This uses a line-based offset collapsing behavior to handle tokens on the same line.
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* For example, consider the following two cases:
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*
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* (
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* [
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* bar
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* ]
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* )
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*
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* ([
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* bar
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* ])
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*
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* Based on the first case, it's clear that the `bar` token needs to have an offset of 1 indent level (4 spaces) from
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* the `[` token, and the `[` token has to have an offset of 1 indent level from the `(` token. Since the `(` token is
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* the first on its line (with an indent of 0 spaces), the `bar` token needs to be offset by 2 indent levels (8 spaces)
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* from the start of its line.
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*
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* However, in the second case `bar` should only be indented by 4 spaces. This is because the offset of 1 indent level
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* between the `(` and the `[` tokens gets "collapsed" because the two tokens are on the same line. As a result, the
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* `(` token is mapped to the `[` token with an offset of 0, and the rule correctly decides that `bar` should be indented
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* by 1 indent level from the start of the line.
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*
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* This is useful because rule listeners can usually just call `setDesiredOffset` for all the tokens in the node,
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* without needing to check which lines those tokens are on.
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*
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* Note that since collapsing only occurs when two tokens are on the same line, there are a few cases where non-intuitive
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* behavior can occur. For example, consider the following cases:
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*
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* foo(
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* ).
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* bar(
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* baz
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* )
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*
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* foo(
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* ).bar(
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* baz
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* )
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*
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* Based on the first example, it would seem that `bar` should be offset by 1 indent level from `foo`, and `baz`
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* should be offset by 1 indent level from `bar`. However, this is not correct, because it would result in `baz`
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* being indented by 2 indent levels in the second case (since `foo`, `bar`, and `baz` are all on separate lines, no
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* collapsing would occur).
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*
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* Instead, the correct way would be to offset `baz` by 1 level from `bar`, offset `bar` by 1 level from the `)`, and
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* offset the `)` by 0 levels from `foo`. This ensures that the offset between `bar` and the `)` are correctly collapsed
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* in the second case.
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* @param {Token} token The token
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* @param {Token} fromToken The token that `token` should be offset from
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* @param {number} offset The desired indent level
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* @returns {void}
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*/
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setDesiredOffset(token, fromToken, offset) {
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return this.setDesiredOffsets(token.range, fromToken, offset);
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}
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/**
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* Sets the desired offset of all tokens in a range
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* It's common for node listeners in this file to need to apply the same offset to a large, contiguous range of tokens.
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* Moreover, the offset of any given token is usually updated multiple times (roughly once for each node that contains
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* it). This means that the offset of each token is updated O(AST depth) times.
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* It would not be performant to store and update the offsets for each token independently, because the rule would end
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* up having a time complexity of O(number of tokens * AST depth), which is quite slow for large files.
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*
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* Instead, the offset tree is represented as a collection of contiguous offset ranges in a file. For example, the following
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* list could represent the state of the offset tree at a given point:
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*
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* * Tokens starting in the interval [0, 15) are aligned with the beginning of the file
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* * Tokens starting in the interval [15, 30) are offset by 1 indent level from the `bar` token
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* * Tokens starting in the interval [30, 43) are offset by 1 indent level from the `foo` token
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* * Tokens starting in the interval [43, 820) are offset by 2 indent levels from the `bar` token
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* * Tokens starting in the interval [820, ∞) are offset by 1 indent level from the `baz` token
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*
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* The `setDesiredOffsets` methods inserts ranges like the ones above. The third line above would be inserted by using:
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* `setDesiredOffsets([30, 43], fooToken, 1);`
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* @param {[number, number]} range A [start, end] pair. All tokens with range[0] <= token.start < range[1] will have the offset applied.
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* @param {Token} fromToken The token that this is offset from
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* @param {number} offset The desired indent level
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* @param {boolean} force `true` if this offset should not use the normal collapsing behavior. This should almost always be false.
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* @returns {void}
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*/
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setDesiredOffsets(range, fromToken, offset, force) {
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/*
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* Offset ranges are stored as a collection of nodes, where each node maps a numeric key to an offset
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* descriptor. The tree for the example above would have the following nodes:
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*
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* * key: 0, value: { offset: 0, from: null }
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* * key: 15, value: { offset: 1, from: barToken }
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* * key: 30, value: { offset: 1, from: fooToken }
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* * key: 43, value: { offset: 2, from: barToken }
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* * key: 820, value: { offset: 1, from: bazToken }
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*
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* To find the offset descriptor for any given token, one needs to find the node with the largest key
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* which is <= token.start. To make this operation fast, the nodes are stored in a balanced binary
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* search tree indexed by key.
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*/
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const descriptorToInsert = { offset, from: fromToken, force };
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const descriptorAfterRange = this._tree.findLe(range[1]).value;
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const fromTokenIsInRange = fromToken && fromToken.range[0] >= range[0] && fromToken.range[1] <= range[1];
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const fromTokenDescriptor = fromTokenIsInRange && this._getOffsetDescriptor(fromToken);
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// First, remove any existing nodes in the range from the tree.
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this._tree.deleteRange(range[0] + 1, range[1]);
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// Insert a new node into the tree for this range
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this._tree.insert(range[0], descriptorToInsert);
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/*
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* To avoid circular offset dependencies, keep the `fromToken` token mapped to whatever it was mapped to previously,
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* even if it's in the current range.
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*/
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if (fromTokenIsInRange) {
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this._tree.insert(fromToken.range[0], fromTokenDescriptor);
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this._tree.insert(fromToken.range[1], descriptorToInsert);
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}
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/*
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* To avoid modifying the offset of tokens after the range, insert another node to keep the offset of the following
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* tokens the same as it was before.
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*/
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this._tree.insert(range[1], descriptorAfterRange);
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}
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/**
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* Gets the desired indent of a token
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* @param {Token} token The token
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* @returns {string} The desired indent of the token
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*/
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getDesiredIndent(token) {
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if (!this._desiredIndentCache.has(token)) {
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if (this._ignoredTokens.has(token)) {
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|
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/*
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* If the token is ignored, use the actual indent of the token as the desired indent.
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* This ensures that no errors are reported for this token.
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*/
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this._desiredIndentCache.set(
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token,
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this._tokenInfo.getTokenIndent(token)
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);
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} else if (this._lockedFirstTokens.has(token)) {
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const firstToken = this._lockedFirstTokens.get(token);
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|
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this._desiredIndentCache.set(
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token,
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// (indentation for the first element's line)
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this.getDesiredIndent(this._tokenInfo.getFirstTokenOfLine(firstToken)) +
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|
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// (space between the start of the first element's line and the first element)
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this._indentType.repeat(firstToken.loc.start.column - this._tokenInfo.getFirstTokenOfLine(firstToken).loc.start.column)
|
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);
|
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} else {
|
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const offsetInfo = this._getOffsetDescriptor(token);
|
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const offset = (
|
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offsetInfo.from &&
|
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offsetInfo.from.loc.start.line === token.loc.start.line &&
|
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!/^\s*?\n/u.test(token.value) &&
|
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!offsetInfo.force
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) ? 0 : offsetInfo.offset * this._indentSize;
|
|
|
|
this._desiredIndentCache.set(
|
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token,
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(offsetInfo.from ? this.getDesiredIndent(offsetInfo.from) : "") + this._indentType.repeat(offset)
|
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);
|
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}
|
|
}
|
|
return this._desiredIndentCache.get(token);
|
|
}
|
|
|
|
/**
|
|
* Ignores a token, preventing it from being reported.
|
|
* @param {Token} token The token
|
|
* @returns {void}
|
|
*/
|
|
ignoreToken(token) {
|
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if (this._tokenInfo.isFirstTokenOfLine(token)) {
|
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this._ignoredTokens.add(token);
|
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}
|
|
}
|
|
|
|
/**
|
|
* Gets the first token that the given token's indentation is dependent on
|
|
* @param {Token} token The token
|
|
* @returns {Token} The token that the given token depends on, or `null` if the given token is at the top level
|
|
*/
|
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getFirstDependency(token) {
|
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return this._getOffsetDescriptor(token).from;
|
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}
|
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}
|
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|
|
const ELEMENT_LIST_SCHEMA = {
|
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oneOf: [
|
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{
|
|
type: "integer",
|
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minimum: 0
|
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},
|
|
{
|
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enum: ["first", "off"]
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}
|
|
]
|
|
};
|
|
|
|
module.exports = {
|
|
meta: {
|
|
type: "layout",
|
|
|
|
docs: {
|
|
description: "enforce consistent indentation",
|
|
category: "Stylistic Issues",
|
|
recommended: false,
|
|
url: "https://eslint.org/docs/rules/indent"
|
|
},
|
|
|
|
fixable: "whitespace",
|
|
|
|
schema: [
|
|
{
|
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oneOf: [
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{
|
|
enum: ["tab"]
|
|
},
|
|
{
|
|
type: "integer",
|
|
minimum: 0
|
|
}
|
|
]
|
|
},
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
SwitchCase: {
|
|
type: "integer",
|
|
minimum: 0,
|
|
default: 0
|
|
},
|
|
VariableDeclarator: {
|
|
oneOf: [
|
|
ELEMENT_LIST_SCHEMA,
|
|
{
|
|
type: "object",
|
|
properties: {
|
|
var: ELEMENT_LIST_SCHEMA,
|
|
let: ELEMENT_LIST_SCHEMA,
|
|
const: ELEMENT_LIST_SCHEMA
|
|
},
|
|
additionalProperties: false
|
|
}
|
|
]
|
|
},
|
|
outerIIFEBody: {
|
|
oneOf: [
|
|
{
|
|
type: "integer",
|
|
minimum: 0
|
|
},
|
|
{
|
|
enum: ["off"]
|
|
}
|
|
]
|
|
},
|
|
MemberExpression: {
|
|
oneOf: [
|
|
{
|
|
type: "integer",
|
|
minimum: 0
|
|
},
|
|
{
|
|
enum: ["off"]
|
|
}
|
|
]
|
|
},
|
|
FunctionDeclaration: {
|
|
type: "object",
|
|
properties: {
|
|
parameters: ELEMENT_LIST_SCHEMA,
|
|
body: {
|
|
type: "integer",
|
|
minimum: 0
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
},
|
|
FunctionExpression: {
|
|
type: "object",
|
|
properties: {
|
|
parameters: ELEMENT_LIST_SCHEMA,
|
|
body: {
|
|
type: "integer",
|
|
minimum: 0
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
},
|
|
CallExpression: {
|
|
type: "object",
|
|
properties: {
|
|
arguments: ELEMENT_LIST_SCHEMA
|
|
},
|
|
additionalProperties: false
|
|
},
|
|
ArrayExpression: ELEMENT_LIST_SCHEMA,
|
|
ObjectExpression: ELEMENT_LIST_SCHEMA,
|
|
ImportDeclaration: ELEMENT_LIST_SCHEMA,
|
|
flatTernaryExpressions: {
|
|
type: "boolean",
|
|
default: false
|
|
},
|
|
offsetTernaryExpressions: {
|
|
type: "boolean",
|
|
default: false
|
|
},
|
|
ignoredNodes: {
|
|
type: "array",
|
|
items: {
|
|
type: "string",
|
|
not: {
|
|
pattern: ":exit$"
|
|
}
|
|
}
|
|
},
|
|
ignoreComments: {
|
|
type: "boolean",
|
|
default: false
|
|
}
|
|
},
|
|
additionalProperties: false
|
|
}
|
|
],
|
|
messages: {
|
|
wrongIndentation: "Expected indentation of {{expected}} but found {{actual}}."
|
|
}
|
|
},
|
|
|
|
create(context) {
|
|
const DEFAULT_VARIABLE_INDENT = 1;
|
|
const DEFAULT_PARAMETER_INDENT = 1;
|
|
const DEFAULT_FUNCTION_BODY_INDENT = 1;
|
|
|
|
let indentType = "space";
|
|
let indentSize = 4;
|
|
const options = {
|
|
SwitchCase: 0,
|
|
VariableDeclarator: {
|
|
var: DEFAULT_VARIABLE_INDENT,
|
|
let: DEFAULT_VARIABLE_INDENT,
|
|
const: DEFAULT_VARIABLE_INDENT
|
|
},
|
|
outerIIFEBody: 1,
|
|
FunctionDeclaration: {
|
|
parameters: DEFAULT_PARAMETER_INDENT,
|
|
body: DEFAULT_FUNCTION_BODY_INDENT
|
|
},
|
|
FunctionExpression: {
|
|
parameters: DEFAULT_PARAMETER_INDENT,
|
|
body: DEFAULT_FUNCTION_BODY_INDENT
|
|
},
|
|
CallExpression: {
|
|
arguments: DEFAULT_PARAMETER_INDENT
|
|
},
|
|
MemberExpression: 1,
|
|
ArrayExpression: 1,
|
|
ObjectExpression: 1,
|
|
ImportDeclaration: 1,
|
|
flatTernaryExpressions: false,
|
|
ignoredNodes: [],
|
|
ignoreComments: false
|
|
};
|
|
|
|
if (context.options.length) {
|
|
if (context.options[0] === "tab") {
|
|
indentSize = 1;
|
|
indentType = "tab";
|
|
} else {
|
|
indentSize = context.options[0];
|
|
indentType = "space";
|
|
}
|
|
|
|
if (context.options[1]) {
|
|
Object.assign(options, context.options[1]);
|
|
|
|
if (typeof options.VariableDeclarator === "number" || options.VariableDeclarator === "first") {
|
|
options.VariableDeclarator = {
|
|
var: options.VariableDeclarator,
|
|
let: options.VariableDeclarator,
|
|
const: options.VariableDeclarator
|
|
};
|
|
}
|
|
}
|
|
}
|
|
|
|
const sourceCode = context.getSourceCode();
|
|
const tokenInfo = new TokenInfo(sourceCode);
|
|
const offsets = new OffsetStorage(tokenInfo, indentSize, indentType === "space" ? " " : "\t");
|
|
const parameterParens = new WeakSet();
|
|
|
|
/**
|
|
* Creates an error message for a line, given the expected/actual indentation.
|
|
* @param {int} expectedAmount The expected amount of indentation characters for this line
|
|
* @param {int} actualSpaces The actual number of indentation spaces that were found on this line
|
|
* @param {int} actualTabs The actual number of indentation tabs that were found on this line
|
|
* @returns {string} An error message for this line
|
|
*/
|
|
function createErrorMessageData(expectedAmount, actualSpaces, actualTabs) {
|
|
const expectedStatement = `${expectedAmount} ${indentType}${expectedAmount === 1 ? "" : "s"}`; // e.g. "2 tabs"
|
|
const foundSpacesWord = `space${actualSpaces === 1 ? "" : "s"}`; // e.g. "space"
|
|
const foundTabsWord = `tab${actualTabs === 1 ? "" : "s"}`; // e.g. "tabs"
|
|
let foundStatement;
|
|
|
|
if (actualSpaces > 0) {
|
|
|
|
/*
|
|
* Abbreviate the message if the expected indentation is also spaces.
|
|
* e.g. 'Expected 4 spaces but found 2' rather than 'Expected 4 spaces but found 2 spaces'
|
|
*/
|
|
foundStatement = indentType === "space" ? actualSpaces : `${actualSpaces} ${foundSpacesWord}`;
|
|
} else if (actualTabs > 0) {
|
|
foundStatement = indentType === "tab" ? actualTabs : `${actualTabs} ${foundTabsWord}`;
|
|
} else {
|
|
foundStatement = "0";
|
|
}
|
|
return {
|
|
expected: expectedStatement,
|
|
actual: foundStatement
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Reports a given indent violation
|
|
* @param {Token} token Token violating the indent rule
|
|
* @param {string} neededIndent Expected indentation string
|
|
* @returns {void}
|
|
*/
|
|
function report(token, neededIndent) {
|
|
const actualIndent = Array.from(tokenInfo.getTokenIndent(token));
|
|
const numSpaces = actualIndent.filter(char => char === " ").length;
|
|
const numTabs = actualIndent.filter(char => char === "\t").length;
|
|
|
|
context.report({
|
|
node: token,
|
|
messageId: "wrongIndentation",
|
|
data: createErrorMessageData(neededIndent.length, numSpaces, numTabs),
|
|
loc: {
|
|
start: { line: token.loc.start.line, column: 0 },
|
|
end: { line: token.loc.start.line, column: token.loc.start.column }
|
|
},
|
|
fix(fixer) {
|
|
const range = [token.range[0] - token.loc.start.column, token.range[0]];
|
|
const newText = neededIndent;
|
|
|
|
return fixer.replaceTextRange(range, newText);
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Checks if a token's indentation is correct
|
|
* @param {Token} token Token to examine
|
|
* @param {string} desiredIndent Desired indentation of the string
|
|
* @returns {boolean} `true` if the token's indentation is correct
|
|
*/
|
|
function validateTokenIndent(token, desiredIndent) {
|
|
const indentation = tokenInfo.getTokenIndent(token);
|
|
|
|
return indentation === desiredIndent ||
|
|
|
|
// To avoid conflicts with no-mixed-spaces-and-tabs, don't report mixed spaces and tabs.
|
|
indentation.includes(" ") && indentation.includes("\t");
|
|
}
|
|
|
|
/**
|
|
* Check to see if the node is a file level IIFE
|
|
* @param {ASTNode} node The function node to check.
|
|
* @returns {boolean} True if the node is the outer IIFE
|
|
*/
|
|
function isOuterIIFE(node) {
|
|
|
|
/*
|
|
* Verify that the node is an IIFE
|
|
*/
|
|
if (!node.parent || node.parent.type !== "CallExpression" || node.parent.callee !== node) {
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Navigate legal ancestors to determine whether this IIFE is outer.
|
|
* A "legal ancestor" is an expression or statement that causes the function to get executed immediately.
|
|
* For example, `!(function(){})()` is an outer IIFE even though it is preceded by a ! operator.
|
|
*/
|
|
let statement = node.parent && node.parent.parent;
|
|
|
|
while (
|
|
statement.type === "UnaryExpression" && ["!", "~", "+", "-"].indexOf(statement.operator) > -1 ||
|
|
statement.type === "AssignmentExpression" ||
|
|
statement.type === "LogicalExpression" ||
|
|
statement.type === "SequenceExpression" ||
|
|
statement.type === "VariableDeclarator"
|
|
) {
|
|
statement = statement.parent;
|
|
}
|
|
|
|
return (statement.type === "ExpressionStatement" || statement.type === "VariableDeclaration") && statement.parent.type === "Program";
|
|
}
|
|
|
|
/**
|
|
* Counts the number of linebreaks that follow the last non-whitespace character in a string
|
|
* @param {string} string The string to check
|
|
* @returns {number} The number of JavaScript linebreaks that follow the last non-whitespace character,
|
|
* or the total number of linebreaks if the string is all whitespace.
|
|
*/
|
|
function countTrailingLinebreaks(string) {
|
|
const trailingWhitespace = string.match(/\s*$/u)[0];
|
|
const linebreakMatches = trailingWhitespace.match(astUtils.createGlobalLinebreakMatcher());
|
|
|
|
return linebreakMatches === null ? 0 : linebreakMatches.length;
|
|
}
|
|
|
|
/**
|
|
* Check indentation for lists of elements (arrays, objects, function params)
|
|
* @param {ASTNode[]} elements List of elements that should be offset
|
|
* @param {Token} startToken The start token of the list that element should be aligned against, e.g. '['
|
|
* @param {Token} endToken The end token of the list, e.g. ']'
|
|
* @param {number|string} offset The amount that the elements should be offset
|
|
* @returns {void}
|
|
*/
|
|
function addElementListIndent(elements, startToken, endToken, offset) {
|
|
|
|
/**
|
|
* Gets the first token of a given element, including surrounding parentheses.
|
|
* @param {ASTNode} element A node in the `elements` list
|
|
* @returns {Token} The first token of this element
|
|
*/
|
|
function getFirstToken(element) {
|
|
let token = sourceCode.getTokenBefore(element);
|
|
|
|
while (astUtils.isOpeningParenToken(token) && token !== startToken) {
|
|
token = sourceCode.getTokenBefore(token);
|
|
}
|
|
return sourceCode.getTokenAfter(token);
|
|
}
|
|
|
|
// Run through all the tokens in the list, and offset them by one indent level (mainly for comments, other things will end up overridden)
|
|
offsets.setDesiredOffsets(
|
|
[startToken.range[1], endToken.range[0]],
|
|
startToken,
|
|
typeof offset === "number" ? offset : 1
|
|
);
|
|
offsets.setDesiredOffset(endToken, startToken, 0);
|
|
|
|
// If the preference is "first" but there is no first element (e.g. sparse arrays w/ empty first slot), fall back to 1 level.
|
|
if (offset === "first" && elements.length && !elements[0]) {
|
|
return;
|
|
}
|
|
elements.forEach((element, index) => {
|
|
if (!element) {
|
|
|
|
// Skip holes in arrays
|
|
return;
|
|
}
|
|
if (offset === "off") {
|
|
|
|
// Ignore the first token of every element if the "off" option is used
|
|
offsets.ignoreToken(getFirstToken(element));
|
|
}
|
|
|
|
// Offset the following elements correctly relative to the first element
|
|
if (index === 0) {
|
|
return;
|
|
}
|
|
if (offset === "first" && tokenInfo.isFirstTokenOfLine(getFirstToken(element))) {
|
|
offsets.matchOffsetOf(getFirstToken(elements[0]), getFirstToken(element));
|
|
} else {
|
|
const previousElement = elements[index - 1];
|
|
const firstTokenOfPreviousElement = previousElement && getFirstToken(previousElement);
|
|
const previousElementLastToken = previousElement && sourceCode.getLastToken(previousElement);
|
|
|
|
if (
|
|
previousElement &&
|
|
previousElementLastToken.loc.end.line - countTrailingLinebreaks(previousElementLastToken.value) > startToken.loc.end.line
|
|
) {
|
|
offsets.setDesiredOffsets(
|
|
[previousElement.range[1], element.range[1]],
|
|
firstTokenOfPreviousElement,
|
|
0
|
|
);
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Check and decide whether to check for indentation for blockless nodes
|
|
* Scenarios are for or while statements without braces around them
|
|
* @param {ASTNode} node node to examine
|
|
* @returns {void}
|
|
*/
|
|
function addBlocklessNodeIndent(node) {
|
|
if (node.type !== "BlockStatement") {
|
|
const lastParentToken = sourceCode.getTokenBefore(node, astUtils.isNotOpeningParenToken);
|
|
|
|
let firstBodyToken = sourceCode.getFirstToken(node);
|
|
let lastBodyToken = sourceCode.getLastToken(node);
|
|
|
|
while (
|
|
astUtils.isOpeningParenToken(sourceCode.getTokenBefore(firstBodyToken)) &&
|
|
astUtils.isClosingParenToken(sourceCode.getTokenAfter(lastBodyToken))
|
|
) {
|
|
firstBodyToken = sourceCode.getTokenBefore(firstBodyToken);
|
|
lastBodyToken = sourceCode.getTokenAfter(lastBodyToken);
|
|
}
|
|
|
|
offsets.setDesiredOffsets([firstBodyToken.range[0], lastBodyToken.range[1]], lastParentToken, 1);
|
|
|
|
/*
|
|
* For blockless nodes with semicolon-first style, don't indent the semicolon.
|
|
* e.g.
|
|
* if (foo) bar()
|
|
* ; [1, 2, 3].map(foo)
|
|
*/
|
|
const lastToken = sourceCode.getLastToken(node);
|
|
|
|
if (node.type !== "EmptyStatement" && astUtils.isSemicolonToken(lastToken)) {
|
|
offsets.setDesiredOffset(lastToken, lastParentToken, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks the indentation for nodes that are like function calls (`CallExpression` and `NewExpression`)
|
|
* @param {ASTNode} node A CallExpression or NewExpression node
|
|
* @returns {void}
|
|
*/
|
|
function addFunctionCallIndent(node) {
|
|
let openingParen;
|
|
|
|
if (node.arguments.length) {
|
|
openingParen = sourceCode.getFirstTokenBetween(node.callee, node.arguments[0], astUtils.isOpeningParenToken);
|
|
} else {
|
|
openingParen = sourceCode.getLastToken(node, 1);
|
|
}
|
|
const closingParen = sourceCode.getLastToken(node);
|
|
|
|
parameterParens.add(openingParen);
|
|
parameterParens.add(closingParen);
|
|
|
|
/*
|
|
* If `?.` token exists, set desired offset for that.
|
|
* This logic is copied from `MemberExpression`'s.
|
|
*/
|
|
if (node.optional) {
|
|
const dotToken = sourceCode.getTokenAfter(node.callee, astUtils.isQuestionDotToken);
|
|
const calleeParenCount = sourceCode.getTokensBetween(node.callee, dotToken, { filter: astUtils.isClosingParenToken }).length;
|
|
const firstTokenOfCallee = calleeParenCount
|
|
? sourceCode.getTokenBefore(node.callee, { skip: calleeParenCount - 1 })
|
|
: sourceCode.getFirstToken(node.callee);
|
|
const lastTokenOfCallee = sourceCode.getTokenBefore(dotToken);
|
|
const offsetBase = lastTokenOfCallee.loc.end.line === openingParen.loc.start.line
|
|
? lastTokenOfCallee
|
|
: firstTokenOfCallee;
|
|
|
|
offsets.setDesiredOffset(dotToken, offsetBase, 1);
|
|
}
|
|
|
|
const offsetAfterToken = node.callee.type === "TaggedTemplateExpression" ? sourceCode.getFirstToken(node.callee.quasi) : openingParen;
|
|
const offsetToken = sourceCode.getTokenBefore(offsetAfterToken);
|
|
|
|
offsets.setDesiredOffset(openingParen, offsetToken, 0);
|
|
|
|
addElementListIndent(node.arguments, openingParen, closingParen, options.CallExpression.arguments);
|
|
}
|
|
|
|
/**
|
|
* Checks the indentation of parenthesized values, given a list of tokens in a program
|
|
* @param {Token[]} tokens A list of tokens
|
|
* @returns {void}
|
|
*/
|
|
function addParensIndent(tokens) {
|
|
const parenStack = [];
|
|
const parenPairs = [];
|
|
|
|
tokens.forEach(nextToken => {
|
|
|
|
// Accumulate a list of parenthesis pairs
|
|
if (astUtils.isOpeningParenToken(nextToken)) {
|
|
parenStack.push(nextToken);
|
|
} else if (astUtils.isClosingParenToken(nextToken)) {
|
|
parenPairs.unshift({ left: parenStack.pop(), right: nextToken });
|
|
}
|
|
});
|
|
|
|
parenPairs.forEach(pair => {
|
|
const leftParen = pair.left;
|
|
const rightParen = pair.right;
|
|
|
|
// We only want to handle parens around expressions, so exclude parentheses that are in function parameters and function call arguments.
|
|
if (!parameterParens.has(leftParen) && !parameterParens.has(rightParen)) {
|
|
const parenthesizedTokens = new Set(sourceCode.getTokensBetween(leftParen, rightParen));
|
|
|
|
parenthesizedTokens.forEach(token => {
|
|
if (!parenthesizedTokens.has(offsets.getFirstDependency(token))) {
|
|
offsets.setDesiredOffset(token, leftParen, 1);
|
|
}
|
|
});
|
|
}
|
|
|
|
offsets.setDesiredOffset(rightParen, leftParen, 0);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Ignore all tokens within an unknown node whose offset do not depend
|
|
* on another token's offset within the unknown node
|
|
* @param {ASTNode} node Unknown Node
|
|
* @returns {void}
|
|
*/
|
|
function ignoreNode(node) {
|
|
const unknownNodeTokens = new Set(sourceCode.getTokens(node, { includeComments: true }));
|
|
|
|
unknownNodeTokens.forEach(token => {
|
|
if (!unknownNodeTokens.has(offsets.getFirstDependency(token))) {
|
|
const firstTokenOfLine = tokenInfo.getFirstTokenOfLine(token);
|
|
|
|
if (token === firstTokenOfLine) {
|
|
offsets.ignoreToken(token);
|
|
} else {
|
|
offsets.setDesiredOffset(token, firstTokenOfLine, 0);
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Check whether the given token is on the first line of a statement.
|
|
* @param {Token} token The token to check.
|
|
* @param {ASTNode} leafNode The expression node that the token belongs directly.
|
|
* @returns {boolean} `true` if the token is on the first line of a statement.
|
|
*/
|
|
function isOnFirstLineOfStatement(token, leafNode) {
|
|
let node = leafNode;
|
|
|
|
while (node.parent && !node.parent.type.endsWith("Statement") && !node.parent.type.endsWith("Declaration")) {
|
|
node = node.parent;
|
|
}
|
|
node = node.parent;
|
|
|
|
return !node || node.loc.start.line === token.loc.start.line;
|
|
}
|
|
|
|
/**
|
|
* Check whether there are any blank (whitespace-only) lines between
|
|
* two tokens on separate lines.
|
|
* @param {Token} firstToken The first token.
|
|
* @param {Token} secondToken The second token.
|
|
* @returns {boolean} `true` if the tokens are on separate lines and
|
|
* there exists a blank line between them, `false` otherwise.
|
|
*/
|
|
function hasBlankLinesBetween(firstToken, secondToken) {
|
|
const firstTokenLine = firstToken.loc.end.line;
|
|
const secondTokenLine = secondToken.loc.start.line;
|
|
|
|
if (firstTokenLine === secondTokenLine || firstTokenLine === secondTokenLine - 1) {
|
|
return false;
|
|
}
|
|
|
|
for (let line = firstTokenLine + 1; line < secondTokenLine; ++line) {
|
|
if (!tokenInfo.firstTokensByLineNumber.has(line)) {
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
const ignoredNodeFirstTokens = new Set();
|
|
|
|
const baseOffsetListeners = {
|
|
"ArrayExpression, ArrayPattern"(node) {
|
|
const openingBracket = sourceCode.getFirstToken(node);
|
|
const closingBracket = sourceCode.getTokenAfter([...node.elements].reverse().find(_ => _) || openingBracket, astUtils.isClosingBracketToken);
|
|
|
|
addElementListIndent(node.elements, openingBracket, closingBracket, options.ArrayExpression);
|
|
},
|
|
|
|
"ObjectExpression, ObjectPattern"(node) {
|
|
const openingCurly = sourceCode.getFirstToken(node);
|
|
const closingCurly = sourceCode.getTokenAfter(
|
|
node.properties.length ? node.properties[node.properties.length - 1] : openingCurly,
|
|
astUtils.isClosingBraceToken
|
|
);
|
|
|
|
addElementListIndent(node.properties, openingCurly, closingCurly, options.ObjectExpression);
|
|
},
|
|
|
|
ArrowFunctionExpression(node) {
|
|
const maybeOpeningParen = sourceCode.getFirstToken(node, { skip: node.async ? 1 : 0 });
|
|
|
|
if (astUtils.isOpeningParenToken(maybeOpeningParen)) {
|
|
const openingParen = maybeOpeningParen;
|
|
const closingParen = sourceCode.getTokenBefore(node.body, astUtils.isClosingParenToken);
|
|
|
|
parameterParens.add(openingParen);
|
|
parameterParens.add(closingParen);
|
|
addElementListIndent(node.params, openingParen, closingParen, options.FunctionExpression.parameters);
|
|
}
|
|
|
|
addBlocklessNodeIndent(node.body);
|
|
},
|
|
|
|
AssignmentExpression(node) {
|
|
const operator = sourceCode.getFirstTokenBetween(node.left, node.right, token => token.value === node.operator);
|
|
|
|
offsets.setDesiredOffsets([operator.range[0], node.range[1]], sourceCode.getLastToken(node.left), 1);
|
|
offsets.ignoreToken(operator);
|
|
offsets.ignoreToken(sourceCode.getTokenAfter(operator));
|
|
},
|
|
|
|
"BinaryExpression, LogicalExpression"(node) {
|
|
const operator = sourceCode.getFirstTokenBetween(node.left, node.right, token => token.value === node.operator);
|
|
|
|
/*
|
|
* For backwards compatibility, don't check BinaryExpression indents, e.g.
|
|
* var foo = bar &&
|
|
* baz;
|
|
*/
|
|
|
|
const tokenAfterOperator = sourceCode.getTokenAfter(operator);
|
|
|
|
offsets.ignoreToken(operator);
|
|
offsets.ignoreToken(tokenAfterOperator);
|
|
offsets.setDesiredOffset(tokenAfterOperator, operator, 0);
|
|
},
|
|
|
|
"BlockStatement, ClassBody"(node) {
|
|
let blockIndentLevel;
|
|
|
|
if (node.parent && isOuterIIFE(node.parent)) {
|
|
blockIndentLevel = options.outerIIFEBody;
|
|
} else if (node.parent && (node.parent.type === "FunctionExpression" || node.parent.type === "ArrowFunctionExpression")) {
|
|
blockIndentLevel = options.FunctionExpression.body;
|
|
} else if (node.parent && node.parent.type === "FunctionDeclaration") {
|
|
blockIndentLevel = options.FunctionDeclaration.body;
|
|
} else {
|
|
blockIndentLevel = 1;
|
|
}
|
|
|
|
/*
|
|
* For blocks that aren't lone statements, ensure that the opening curly brace
|
|
* is aligned with the parent.
|
|
*/
|
|
if (!astUtils.STATEMENT_LIST_PARENTS.has(node.parent.type)) {
|
|
offsets.setDesiredOffset(sourceCode.getFirstToken(node), sourceCode.getFirstToken(node.parent), 0);
|
|
}
|
|
|
|
addElementListIndent(node.body, sourceCode.getFirstToken(node), sourceCode.getLastToken(node), blockIndentLevel);
|
|
},
|
|
|
|
CallExpression: addFunctionCallIndent,
|
|
|
|
"ClassDeclaration[superClass], ClassExpression[superClass]"(node) {
|
|
const classToken = sourceCode.getFirstToken(node);
|
|
const extendsToken = sourceCode.getTokenBefore(node.superClass, astUtils.isNotOpeningParenToken);
|
|
|
|
offsets.setDesiredOffsets([extendsToken.range[0], node.body.range[0]], classToken, 1);
|
|
},
|
|
|
|
ConditionalExpression(node) {
|
|
const firstToken = sourceCode.getFirstToken(node);
|
|
|
|
// `flatTernaryExpressions` option is for the following style:
|
|
// var a =
|
|
// foo > 0 ? bar :
|
|
// foo < 0 ? baz :
|
|
// /*else*/ qiz ;
|
|
if (!options.flatTernaryExpressions ||
|
|
!astUtils.isTokenOnSameLine(node.test, node.consequent) ||
|
|
isOnFirstLineOfStatement(firstToken, node)
|
|
) {
|
|
const questionMarkToken = sourceCode.getFirstTokenBetween(node.test, node.consequent, token => token.type === "Punctuator" && token.value === "?");
|
|
const colonToken = sourceCode.getFirstTokenBetween(node.consequent, node.alternate, token => token.type === "Punctuator" && token.value === ":");
|
|
|
|
const firstConsequentToken = sourceCode.getTokenAfter(questionMarkToken);
|
|
const lastConsequentToken = sourceCode.getTokenBefore(colonToken);
|
|
const firstAlternateToken = sourceCode.getTokenAfter(colonToken);
|
|
|
|
offsets.setDesiredOffset(questionMarkToken, firstToken, 1);
|
|
offsets.setDesiredOffset(colonToken, firstToken, 1);
|
|
|
|
offsets.setDesiredOffset(firstConsequentToken, firstToken, firstConsequentToken.type === "Punctuator" &&
|
|
options.offsetTernaryExpressions ? 2 : 1);
|
|
|
|
/*
|
|
* The alternate and the consequent should usually have the same indentation.
|
|
* If they share part of a line, align the alternate against the first token of the consequent.
|
|
* This allows the alternate to be indented correctly in cases like this:
|
|
* foo ? (
|
|
* bar
|
|
* ) : ( // this '(' is aligned with the '(' above, so it's considered to be aligned with `foo`
|
|
* baz // as a result, `baz` is offset by 1 rather than 2
|
|
* )
|
|
*/
|
|
if (lastConsequentToken.loc.end.line === firstAlternateToken.loc.start.line) {
|
|
offsets.setDesiredOffset(firstAlternateToken, firstConsequentToken, 0);
|
|
} else {
|
|
|
|
/**
|
|
* If the alternate and consequent do not share part of a line, offset the alternate from the first
|
|
* token of the conditional expression. For example:
|
|
* foo ? bar
|
|
* : baz
|
|
*
|
|
* If `baz` were aligned with `bar` rather than being offset by 1 from `foo`, `baz` would end up
|
|
* having no expected indentation.
|
|
*/
|
|
offsets.setDesiredOffset(firstAlternateToken, firstToken, firstAlternateToken.type === "Punctuator" &&
|
|
options.offsetTernaryExpressions ? 2 : 1);
|
|
}
|
|
}
|
|
},
|
|
|
|
"DoWhileStatement, WhileStatement, ForInStatement, ForOfStatement": node => addBlocklessNodeIndent(node.body),
|
|
|
|
ExportNamedDeclaration(node) {
|
|
if (node.declaration === null) {
|
|
const closingCurly = sourceCode.getLastToken(node, astUtils.isClosingBraceToken);
|
|
|
|
// Indent the specifiers in `export {foo, bar, baz}`
|
|
addElementListIndent(node.specifiers, sourceCode.getFirstToken(node, { skip: 1 }), closingCurly, 1);
|
|
|
|
if (node.source) {
|
|
|
|
// Indent everything after and including the `from` token in `export {foo, bar, baz} from 'qux'`
|
|
offsets.setDesiredOffsets([closingCurly.range[1], node.range[1]], sourceCode.getFirstToken(node), 1);
|
|
}
|
|
}
|
|
},
|
|
|
|
ForStatement(node) {
|
|
const forOpeningParen = sourceCode.getFirstToken(node, 1);
|
|
|
|
if (node.init) {
|
|
offsets.setDesiredOffsets(node.init.range, forOpeningParen, 1);
|
|
}
|
|
if (node.test) {
|
|
offsets.setDesiredOffsets(node.test.range, forOpeningParen, 1);
|
|
}
|
|
if (node.update) {
|
|
offsets.setDesiredOffsets(node.update.range, forOpeningParen, 1);
|
|
}
|
|
addBlocklessNodeIndent(node.body);
|
|
},
|
|
|
|
"FunctionDeclaration, FunctionExpression"(node) {
|
|
const closingParen = sourceCode.getTokenBefore(node.body);
|
|
const openingParen = sourceCode.getTokenBefore(node.params.length ? node.params[0] : closingParen);
|
|
|
|
parameterParens.add(openingParen);
|
|
parameterParens.add(closingParen);
|
|
addElementListIndent(node.params, openingParen, closingParen, options[node.type].parameters);
|
|
},
|
|
|
|
IfStatement(node) {
|
|
addBlocklessNodeIndent(node.consequent);
|
|
if (node.alternate && node.alternate.type !== "IfStatement") {
|
|
addBlocklessNodeIndent(node.alternate);
|
|
}
|
|
},
|
|
|
|
ImportDeclaration(node) {
|
|
if (node.specifiers.some(specifier => specifier.type === "ImportSpecifier")) {
|
|
const openingCurly = sourceCode.getFirstToken(node, astUtils.isOpeningBraceToken);
|
|
const closingCurly = sourceCode.getLastToken(node, astUtils.isClosingBraceToken);
|
|
|
|
addElementListIndent(node.specifiers.filter(specifier => specifier.type === "ImportSpecifier"), openingCurly, closingCurly, options.ImportDeclaration);
|
|
}
|
|
|
|
const fromToken = sourceCode.getLastToken(node, token => token.type === "Identifier" && token.value === "from");
|
|
const sourceToken = sourceCode.getLastToken(node, token => token.type === "String");
|
|
const semiToken = sourceCode.getLastToken(node, token => token.type === "Punctuator" && token.value === ";");
|
|
|
|
if (fromToken) {
|
|
const end = semiToken && semiToken.range[1] === sourceToken.range[1] ? node.range[1] : sourceToken.range[1];
|
|
|
|
offsets.setDesiredOffsets([fromToken.range[0], end], sourceCode.getFirstToken(node), 1);
|
|
}
|
|
},
|
|
|
|
ImportExpression(node) {
|
|
const openingParen = sourceCode.getFirstToken(node, 1);
|
|
const closingParen = sourceCode.getLastToken(node);
|
|
|
|
parameterParens.add(openingParen);
|
|
parameterParens.add(closingParen);
|
|
offsets.setDesiredOffset(openingParen, sourceCode.getTokenBefore(openingParen), 0);
|
|
|
|
addElementListIndent([node.source], openingParen, closingParen, options.CallExpression.arguments);
|
|
},
|
|
|
|
"MemberExpression, JSXMemberExpression, MetaProperty"(node) {
|
|
const object = node.type === "MetaProperty" ? node.meta : node.object;
|
|
const firstNonObjectToken = sourceCode.getFirstTokenBetween(object, node.property, astUtils.isNotClosingParenToken);
|
|
const secondNonObjectToken = sourceCode.getTokenAfter(firstNonObjectToken);
|
|
|
|
const objectParenCount = sourceCode.getTokensBetween(object, node.property, { filter: astUtils.isClosingParenToken }).length;
|
|
const firstObjectToken = objectParenCount
|
|
? sourceCode.getTokenBefore(object, { skip: objectParenCount - 1 })
|
|
: sourceCode.getFirstToken(object);
|
|
const lastObjectToken = sourceCode.getTokenBefore(firstNonObjectToken);
|
|
const firstPropertyToken = node.computed ? firstNonObjectToken : secondNonObjectToken;
|
|
|
|
if (node.computed) {
|
|
|
|
// For computed MemberExpressions, match the closing bracket with the opening bracket.
|
|
offsets.setDesiredOffset(sourceCode.getLastToken(node), firstNonObjectToken, 0);
|
|
offsets.setDesiredOffsets(node.property.range, firstNonObjectToken, 1);
|
|
}
|
|
|
|
/*
|
|
* If the object ends on the same line that the property starts, match against the last token
|
|
* of the object, to ensure that the MemberExpression is not indented.
|
|
*
|
|
* Otherwise, match against the first token of the object, e.g.
|
|
* foo
|
|
* .bar
|
|
* .baz // <-- offset by 1 from `foo`
|
|
*/
|
|
const offsetBase = lastObjectToken.loc.end.line === firstPropertyToken.loc.start.line
|
|
? lastObjectToken
|
|
: firstObjectToken;
|
|
|
|
if (typeof options.MemberExpression === "number") {
|
|
|
|
// Match the dot (for non-computed properties) or the opening bracket (for computed properties) against the object.
|
|
offsets.setDesiredOffset(firstNonObjectToken, offsetBase, options.MemberExpression);
|
|
|
|
/*
|
|
* For computed MemberExpressions, match the first token of the property against the opening bracket.
|
|
* Otherwise, match the first token of the property against the object.
|
|
*/
|
|
offsets.setDesiredOffset(secondNonObjectToken, node.computed ? firstNonObjectToken : offsetBase, options.MemberExpression);
|
|
} else {
|
|
|
|
// If the MemberExpression option is off, ignore the dot and the first token of the property.
|
|
offsets.ignoreToken(firstNonObjectToken);
|
|
offsets.ignoreToken(secondNonObjectToken);
|
|
|
|
// To ignore the property indentation, ensure that the property tokens depend on the ignored tokens.
|
|
offsets.setDesiredOffset(firstNonObjectToken, offsetBase, 0);
|
|
offsets.setDesiredOffset(secondNonObjectToken, firstNonObjectToken, 0);
|
|
}
|
|
},
|
|
|
|
NewExpression(node) {
|
|
|
|
// Only indent the arguments if the NewExpression has parens (e.g. `new Foo(bar)` or `new Foo()`, but not `new Foo`
|
|
if (node.arguments.length > 0 ||
|
|
astUtils.isClosingParenToken(sourceCode.getLastToken(node)) &&
|
|
astUtils.isOpeningParenToken(sourceCode.getLastToken(node, 1))) {
|
|
addFunctionCallIndent(node);
|
|
}
|
|
},
|
|
|
|
Property(node) {
|
|
if (!node.shorthand && !node.method && node.kind === "init") {
|
|
const colon = sourceCode.getFirstTokenBetween(node.key, node.value, astUtils.isColonToken);
|
|
|
|
offsets.ignoreToken(sourceCode.getTokenAfter(colon));
|
|
}
|
|
},
|
|
|
|
SwitchStatement(node) {
|
|
const openingCurly = sourceCode.getTokenAfter(node.discriminant, astUtils.isOpeningBraceToken);
|
|
const closingCurly = sourceCode.getLastToken(node);
|
|
|
|
offsets.setDesiredOffsets([openingCurly.range[1], closingCurly.range[0]], openingCurly, options.SwitchCase);
|
|
|
|
if (node.cases.length) {
|
|
sourceCode.getTokensBetween(
|
|
node.cases[node.cases.length - 1],
|
|
closingCurly,
|
|
{ includeComments: true, filter: astUtils.isCommentToken }
|
|
).forEach(token => offsets.ignoreToken(token));
|
|
}
|
|
},
|
|
|
|
SwitchCase(node) {
|
|
if (!(node.consequent.length === 1 && node.consequent[0].type === "BlockStatement")) {
|
|
const caseKeyword = sourceCode.getFirstToken(node);
|
|
const tokenAfterCurrentCase = sourceCode.getTokenAfter(node);
|
|
|
|
offsets.setDesiredOffsets([caseKeyword.range[1], tokenAfterCurrentCase.range[0]], caseKeyword, 1);
|
|
}
|
|
},
|
|
|
|
TemplateLiteral(node) {
|
|
node.expressions.forEach((expression, index) => {
|
|
const previousQuasi = node.quasis[index];
|
|
const nextQuasi = node.quasis[index + 1];
|
|
const tokenToAlignFrom = previousQuasi.loc.start.line === previousQuasi.loc.end.line
|
|
? sourceCode.getFirstToken(previousQuasi)
|
|
: null;
|
|
|
|
offsets.setDesiredOffsets([previousQuasi.range[1], nextQuasi.range[0]], tokenToAlignFrom, 1);
|
|
offsets.setDesiredOffset(sourceCode.getFirstToken(nextQuasi), tokenToAlignFrom, 0);
|
|
});
|
|
},
|
|
|
|
VariableDeclaration(node) {
|
|
let variableIndent = Object.prototype.hasOwnProperty.call(options.VariableDeclarator, node.kind)
|
|
? options.VariableDeclarator[node.kind]
|
|
: DEFAULT_VARIABLE_INDENT;
|
|
|
|
const firstToken = sourceCode.getFirstToken(node),
|
|
lastToken = sourceCode.getLastToken(node);
|
|
|
|
if (options.VariableDeclarator[node.kind] === "first") {
|
|
if (node.declarations.length > 1) {
|
|
addElementListIndent(
|
|
node.declarations,
|
|
firstToken,
|
|
lastToken,
|
|
"first"
|
|
);
|
|
return;
|
|
}
|
|
|
|
variableIndent = DEFAULT_VARIABLE_INDENT;
|
|
}
|
|
|
|
if (node.declarations[node.declarations.length - 1].loc.start.line > node.loc.start.line) {
|
|
|
|
/*
|
|
* VariableDeclarator indentation is a bit different from other forms of indentation, in that the
|
|
* indentation of an opening bracket sometimes won't match that of a closing bracket. For example,
|
|
* the following indentations are correct:
|
|
*
|
|
* var foo = {
|
|
* ok: true
|
|
* };
|
|
*
|
|
* var foo = {
|
|
* ok: true,
|
|
* },
|
|
* bar = 1;
|
|
*
|
|
* Account for when exiting the AST (after indentations have already been set for the nodes in
|
|
* the declaration) by manually increasing the indentation level of the tokens in this declarator
|
|
* on the same line as the start of the declaration, provided that there are declarators that
|
|
* follow this one.
|
|
*/
|
|
offsets.setDesiredOffsets(node.range, firstToken, variableIndent, true);
|
|
} else {
|
|
offsets.setDesiredOffsets(node.range, firstToken, variableIndent);
|
|
}
|
|
|
|
if (astUtils.isSemicolonToken(lastToken)) {
|
|
offsets.ignoreToken(lastToken);
|
|
}
|
|
},
|
|
|
|
VariableDeclarator(node) {
|
|
if (node.init) {
|
|
const equalOperator = sourceCode.getTokenBefore(node.init, astUtils.isNotOpeningParenToken);
|
|
const tokenAfterOperator = sourceCode.getTokenAfter(equalOperator);
|
|
|
|
offsets.ignoreToken(equalOperator);
|
|
offsets.ignoreToken(tokenAfterOperator);
|
|
offsets.setDesiredOffsets([tokenAfterOperator.range[0], node.range[1]], equalOperator, 1);
|
|
offsets.setDesiredOffset(equalOperator, sourceCode.getLastToken(node.id), 0);
|
|
}
|
|
},
|
|
|
|
"JSXAttribute[value]"(node) {
|
|
const equalsToken = sourceCode.getFirstTokenBetween(node.name, node.value, token => token.type === "Punctuator" && token.value === "=");
|
|
|
|
offsets.setDesiredOffsets([equalsToken.range[0], node.value.range[1]], sourceCode.getFirstToken(node.name), 1);
|
|
},
|
|
|
|
JSXElement(node) {
|
|
if (node.closingElement) {
|
|
addElementListIndent(node.children, sourceCode.getFirstToken(node.openingElement), sourceCode.getFirstToken(node.closingElement), 1);
|
|
}
|
|
},
|
|
|
|
JSXOpeningElement(node) {
|
|
const firstToken = sourceCode.getFirstToken(node);
|
|
let closingToken;
|
|
|
|
if (node.selfClosing) {
|
|
closingToken = sourceCode.getLastToken(node, { skip: 1 });
|
|
offsets.setDesiredOffset(sourceCode.getLastToken(node), closingToken, 0);
|
|
} else {
|
|
closingToken = sourceCode.getLastToken(node);
|
|
}
|
|
offsets.setDesiredOffsets(node.name.range, sourceCode.getFirstToken(node));
|
|
addElementListIndent(node.attributes, firstToken, closingToken, 1);
|
|
},
|
|
|
|
JSXClosingElement(node) {
|
|
const firstToken = sourceCode.getFirstToken(node);
|
|
|
|
offsets.setDesiredOffsets(node.name.range, firstToken, 1);
|
|
},
|
|
|
|
JSXFragment(node) {
|
|
const firstOpeningToken = sourceCode.getFirstToken(node.openingFragment);
|
|
const firstClosingToken = sourceCode.getFirstToken(node.closingFragment);
|
|
|
|
addElementListIndent(node.children, firstOpeningToken, firstClosingToken, 1);
|
|
},
|
|
|
|
JSXOpeningFragment(node) {
|
|
const firstToken = sourceCode.getFirstToken(node);
|
|
const closingToken = sourceCode.getLastToken(node);
|
|
|
|
offsets.setDesiredOffsets(node.range, firstToken, 1);
|
|
offsets.matchOffsetOf(firstToken, closingToken);
|
|
},
|
|
|
|
JSXClosingFragment(node) {
|
|
const firstToken = sourceCode.getFirstToken(node);
|
|
const slashToken = sourceCode.getLastToken(node, { skip: 1 });
|
|
const closingToken = sourceCode.getLastToken(node);
|
|
const tokenToMatch = astUtils.isTokenOnSameLine(slashToken, closingToken) ? slashToken : closingToken;
|
|
|
|
offsets.setDesiredOffsets(node.range, firstToken, 1);
|
|
offsets.matchOffsetOf(firstToken, tokenToMatch);
|
|
},
|
|
|
|
JSXExpressionContainer(node) {
|
|
const openingCurly = sourceCode.getFirstToken(node);
|
|
const closingCurly = sourceCode.getLastToken(node);
|
|
|
|
offsets.setDesiredOffsets(
|
|
[openingCurly.range[1], closingCurly.range[0]],
|
|
openingCurly,
|
|
1
|
|
);
|
|
},
|
|
|
|
JSXSpreadAttribute(node) {
|
|
const openingCurly = sourceCode.getFirstToken(node);
|
|
const closingCurly = sourceCode.getLastToken(node);
|
|
|
|
offsets.setDesiredOffsets(
|
|
[openingCurly.range[1], closingCurly.range[0]],
|
|
openingCurly,
|
|
1
|
|
);
|
|
},
|
|
|
|
"*"(node) {
|
|
const firstToken = sourceCode.getFirstToken(node);
|
|
|
|
// Ensure that the children of every node are indented at least as much as the first token.
|
|
if (firstToken && !ignoredNodeFirstTokens.has(firstToken)) {
|
|
offsets.setDesiredOffsets(node.range, firstToken, 0);
|
|
}
|
|
}
|
|
};
|
|
|
|
const listenerCallQueue = [];
|
|
|
|
/*
|
|
* To ignore the indentation of a node:
|
|
* 1. Don't call the node's listener when entering it (if it has a listener)
|
|
* 2. Don't set any offsets against the first token of the node.
|
|
* 3. Call `ignoreNode` on the node sometime after exiting it and before validating offsets.
|
|
*/
|
|
const offsetListeners = {};
|
|
|
|
for (const [selector, listener] of Object.entries(baseOffsetListeners)) {
|
|
|
|
/*
|
|
* Offset listener calls are deferred until traversal is finished, and are called as
|
|
* part of the final `Program:exit` listener. This is necessary because a node might
|
|
* be matched by multiple selectors.
|
|
*
|
|
* Example: Suppose there is an offset listener for `Identifier`, and the user has
|
|
* specified in configuration that `MemberExpression > Identifier` should be ignored.
|
|
* Due to selector specificity rules, the `Identifier` listener will get called first. However,
|
|
* if a given Identifier node is supposed to be ignored, then the `Identifier` offset listener
|
|
* should not have been called at all. Without doing extra selector matching, we don't know
|
|
* whether the Identifier matches the `MemberExpression > Identifier` selector until the
|
|
* `MemberExpression > Identifier` listener is called.
|
|
*
|
|
* To avoid this, the `Identifier` listener isn't called until traversal finishes and all
|
|
* ignored nodes are known.
|
|
*/
|
|
offsetListeners[selector] = node => listenerCallQueue.push({ listener, node });
|
|
}
|
|
|
|
// For each ignored node selector, set up a listener to collect it into the `ignoredNodes` set.
|
|
const ignoredNodes = new Set();
|
|
|
|
/**
|
|
* Ignores a node
|
|
* @param {ASTNode} node The node to ignore
|
|
* @returns {void}
|
|
*/
|
|
function addToIgnoredNodes(node) {
|
|
ignoredNodes.add(node);
|
|
ignoredNodeFirstTokens.add(sourceCode.getFirstToken(node));
|
|
}
|
|
|
|
const ignoredNodeListeners = options.ignoredNodes.reduce(
|
|
(listeners, ignoredSelector) => Object.assign(listeners, { [ignoredSelector]: addToIgnoredNodes }),
|
|
{}
|
|
);
|
|
|
|
/*
|
|
* Join the listeners, and add a listener to verify that all tokens actually have the correct indentation
|
|
* at the end.
|
|
*
|
|
* Using Object.assign will cause some offset listeners to be overwritten if the same selector also appears
|
|
* in `ignoredNodeListeners`. This isn't a problem because all of the matching nodes will be ignored,
|
|
* so those listeners wouldn't be called anyway.
|
|
*/
|
|
return Object.assign(
|
|
offsetListeners,
|
|
ignoredNodeListeners,
|
|
{
|
|
"*:exit"(node) {
|
|
|
|
// If a node's type is nonstandard, we can't tell how its children should be offset, so ignore it.
|
|
if (!KNOWN_NODES.has(node.type)) {
|
|
addToIgnoredNodes(node);
|
|
}
|
|
},
|
|
"Program:exit"() {
|
|
|
|
// If ignoreComments option is enabled, ignore all comment tokens.
|
|
if (options.ignoreComments) {
|
|
sourceCode.getAllComments()
|
|
.forEach(comment => offsets.ignoreToken(comment));
|
|
}
|
|
|
|
// Invoke the queued offset listeners for the nodes that aren't ignored.
|
|
listenerCallQueue
|
|
.filter(nodeInfo => !ignoredNodes.has(nodeInfo.node))
|
|
.forEach(nodeInfo => nodeInfo.listener(nodeInfo.node));
|
|
|
|
// Update the offsets for ignored nodes to prevent their child tokens from being reported.
|
|
ignoredNodes.forEach(ignoreNode);
|
|
|
|
addParensIndent(sourceCode.ast.tokens);
|
|
|
|
/*
|
|
* Create a Map from (tokenOrComment) => (precedingToken).
|
|
* This is necessary because sourceCode.getTokenBefore does not handle a comment as an argument correctly.
|
|
*/
|
|
const precedingTokens = sourceCode.ast.comments.reduce((commentMap, comment) => {
|
|
const tokenOrCommentBefore = sourceCode.getTokenBefore(comment, { includeComments: true });
|
|
|
|
return commentMap.set(comment, commentMap.has(tokenOrCommentBefore) ? commentMap.get(tokenOrCommentBefore) : tokenOrCommentBefore);
|
|
}, new WeakMap());
|
|
|
|
sourceCode.lines.forEach((line, lineIndex) => {
|
|
const lineNumber = lineIndex + 1;
|
|
|
|
if (!tokenInfo.firstTokensByLineNumber.has(lineNumber)) {
|
|
|
|
// Don't check indentation on blank lines
|
|
return;
|
|
}
|
|
|
|
const firstTokenOfLine = tokenInfo.firstTokensByLineNumber.get(lineNumber);
|
|
|
|
if (firstTokenOfLine.loc.start.line !== lineNumber) {
|
|
|
|
// Don't check the indentation of multi-line tokens (e.g. template literals or block comments) twice.
|
|
return;
|
|
}
|
|
|
|
if (astUtils.isCommentToken(firstTokenOfLine)) {
|
|
const tokenBefore = precedingTokens.get(firstTokenOfLine);
|
|
const tokenAfter = tokenBefore ? sourceCode.getTokenAfter(tokenBefore) : sourceCode.ast.tokens[0];
|
|
const mayAlignWithBefore = tokenBefore && !hasBlankLinesBetween(tokenBefore, firstTokenOfLine);
|
|
const mayAlignWithAfter = tokenAfter && !hasBlankLinesBetween(firstTokenOfLine, tokenAfter);
|
|
|
|
/*
|
|
* If a comment precedes a line that begins with a semicolon token, align to that token, i.e.
|
|
*
|
|
* let foo
|
|
* // comment
|
|
* ;(async () => {})()
|
|
*/
|
|
if (tokenAfter && astUtils.isSemicolonToken(tokenAfter) && !astUtils.isTokenOnSameLine(firstTokenOfLine, tokenAfter)) {
|
|
offsets.setDesiredOffset(firstTokenOfLine, tokenAfter, 0);
|
|
}
|
|
|
|
// If a comment matches the expected indentation of the token immediately before or after, don't report it.
|
|
if (
|
|
mayAlignWithBefore && validateTokenIndent(firstTokenOfLine, offsets.getDesiredIndent(tokenBefore)) ||
|
|
mayAlignWithAfter && validateTokenIndent(firstTokenOfLine, offsets.getDesiredIndent(tokenAfter))
|
|
) {
|
|
return;
|
|
}
|
|
}
|
|
|
|
// If the token matches the expected indentation, don't report it.
|
|
if (validateTokenIndent(firstTokenOfLine, offsets.getDesiredIndent(firstTokenOfLine))) {
|
|
return;
|
|
}
|
|
|
|
// Otherwise, report the token/comment.
|
|
report(firstTokenOfLine, offsets.getDesiredIndent(firstTokenOfLine));
|
|
});
|
|
}
|
|
}
|
|
);
|
|
}
|
|
};
|