291 lines
10 KiB
JavaScript
Executable File
291 lines
10 KiB
JavaScript
Executable File
/**
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* @fileoverview Validate closing bracket location in JSX
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* @author Yannick Croissant
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*/
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'use strict';
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const has = require('has');
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const docsUrl = require('../util/docsUrl');
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// ------------------------------------------------------------------------------
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// Rule Definition
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// ------------------------------------------------------------------------------
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module.exports = {
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meta: {
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docs: {
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description: 'Validate closing bracket location in JSX',
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category: 'Stylistic Issues',
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recommended: false,
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url: docsUrl('jsx-closing-bracket-location')
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},
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fixable: 'code',
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schema: [{
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oneOf: [
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{
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enum: ['after-props', 'props-aligned', 'tag-aligned', 'line-aligned']
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},
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{
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type: 'object',
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properties: {
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location: {
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enum: ['after-props', 'props-aligned', 'tag-aligned', 'line-aligned']
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}
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},
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additionalProperties: false
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}, {
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type: 'object',
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properties: {
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nonEmpty: {
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enum: ['after-props', 'props-aligned', 'tag-aligned', 'line-aligned', false]
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},
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selfClosing: {
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enum: ['after-props', 'props-aligned', 'tag-aligned', 'line-aligned', false]
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}
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},
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additionalProperties: false
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}
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]
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}]
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},
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create(context) {
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const MESSAGE = 'The closing bracket must be {{location}}{{details}}';
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const MESSAGE_LOCATION = {
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'after-props': 'placed after the last prop',
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'after-tag': 'placed after the opening tag',
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'props-aligned': 'aligned with the last prop',
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'tag-aligned': 'aligned with the opening tag',
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'line-aligned': 'aligned with the line containing the opening tag'
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};
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const DEFAULT_LOCATION = 'tag-aligned';
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const config = context.options[0];
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const options = {
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nonEmpty: DEFAULT_LOCATION,
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selfClosing: DEFAULT_LOCATION
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};
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if (typeof config === 'string') {
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// simple shorthand [1, 'something']
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options.nonEmpty = config;
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options.selfClosing = config;
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} else if (typeof config === 'object') {
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// [1, {location: 'something'}] (back-compat)
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if (has(config, 'location')) {
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options.nonEmpty = config.location;
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options.selfClosing = config.location;
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}
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// [1, {nonEmpty: 'something'}]
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if (has(config, 'nonEmpty')) {
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options.nonEmpty = config.nonEmpty;
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}
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// [1, {selfClosing: 'something'}]
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if (has(config, 'selfClosing')) {
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options.selfClosing = config.selfClosing;
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}
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}
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/**
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* Get expected location for the closing bracket
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* @param {Object} tokens Locations of the opening bracket, closing bracket and last prop
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* @return {String} Expected location for the closing bracket
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*/
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function getExpectedLocation(tokens) {
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let location;
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// Is always after the opening tag if there is no props
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if (typeof tokens.lastProp === 'undefined') {
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location = 'after-tag';
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// Is always after the last prop if this one is on the same line as the opening bracket
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} else if (tokens.opening.line === tokens.lastProp.lastLine) {
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location = 'after-props';
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// Else use configuration dependent on selfClosing property
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} else {
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location = tokens.selfClosing ? options.selfClosing : options.nonEmpty;
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}
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return location;
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}
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/**
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* Get the correct 0-indexed column for the closing bracket, given the
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* expected location.
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* @param {Object} tokens Locations of the opening bracket, closing bracket and last prop
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* @param {String} expectedLocation Expected location for the closing bracket
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* @return {?Number} The correct column for the closing bracket, or null
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*/
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function getCorrectColumn(tokens, expectedLocation) {
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switch (expectedLocation) {
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case 'props-aligned':
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return tokens.lastProp.column;
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case 'tag-aligned':
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return tokens.opening.column;
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case 'line-aligned':
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return tokens.openingStartOfLine.column;
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default:
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return null;
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}
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}
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/**
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* Check if the closing bracket is correctly located
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* @param {Object} tokens Locations of the opening bracket, closing bracket and last prop
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* @param {String} expectedLocation Expected location for the closing bracket
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* @return {Boolean} True if the closing bracket is correctly located, false if not
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*/
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function hasCorrectLocation(tokens, expectedLocation) {
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switch (expectedLocation) {
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case 'after-tag':
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return tokens.tag.line === tokens.closing.line;
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case 'after-props':
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return tokens.lastProp.lastLine === tokens.closing.line;
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case 'props-aligned':
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case 'tag-aligned':
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case 'line-aligned': {
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const correctColumn = getCorrectColumn(tokens, expectedLocation);
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return correctColumn === tokens.closing.column;
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}
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default:
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return true;
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}
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}
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/**
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* Get the characters used for indentation on the line to be matched
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* @param {Object} tokens Locations of the opening bracket, closing bracket and last prop
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* @param {String} expectedLocation Expected location for the closing bracket
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* @param {Number} [correctColumn] Expected column for the closing bracket. Default to 0
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* @return {String} The characters used for indentation
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*/
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function getIndentation(tokens, expectedLocation, correctColumn) {
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correctColumn = correctColumn || 0;
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let indentation;
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let spaces = [];
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switch (expectedLocation) {
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case 'props-aligned':
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indentation = /^\s*/.exec(context.getSourceCode().lines[tokens.lastProp.firstLine - 1])[0];
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break;
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case 'tag-aligned':
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case 'line-aligned':
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indentation = /^\s*/.exec(context.getSourceCode().lines[tokens.opening.line - 1])[0];
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break;
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default:
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indentation = '';
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}
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if (indentation.length + 1 < correctColumn) {
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// Non-whitespace characters were included in the column offset
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spaces = new Array(+correctColumn + 1 - indentation.length);
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}
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return indentation + spaces.join(' ');
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}
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/**
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* Get the locations of the opening bracket, closing bracket, last prop, and
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* start of opening line.
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* @param {ASTNode} node The node to check
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* @return {Object} Locations of the opening bracket, closing bracket, last
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* prop and start of opening line.
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*/
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function getTokensLocations(node) {
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const sourceCode = context.getSourceCode();
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const opening = sourceCode.getFirstToken(node).loc.start;
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const closing = sourceCode.getLastTokens(node, node.selfClosing ? 2 : 1)[0].loc.start;
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const tag = sourceCode.getFirstToken(node.name).loc.start;
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let lastProp;
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if (node.attributes.length) {
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lastProp = node.attributes[node.attributes.length - 1];
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lastProp = {
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column: sourceCode.getFirstToken(lastProp).loc.start.column,
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firstLine: sourceCode.getFirstToken(lastProp).loc.start.line,
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lastLine: sourceCode.getLastToken(lastProp).loc.end.line
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};
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}
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const openingLine = sourceCode.lines[opening.line - 1];
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const openingStartOfLine = {
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column: /^\s*/.exec(openingLine)[0].length,
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line: opening.line
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};
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return {
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tag,
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opening,
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closing,
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lastProp,
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selfClosing: node.selfClosing,
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openingStartOfLine
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};
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}
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/**
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* Get an unique ID for a given JSXOpeningElement
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*
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* @param {ASTNode} node The AST node being checked.
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* @returns {String} Unique ID (based on its range)
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*/
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function getOpeningElementId(node) {
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return node.range.join(':');
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}
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const lastAttributeNode = {};
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return {
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JSXAttribute(node) {
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lastAttributeNode[getOpeningElementId(node.parent)] = node;
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},
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JSXSpreadAttribute(node) {
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lastAttributeNode[getOpeningElementId(node.parent)] = node;
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},
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'JSXOpeningElement:exit': function (node) {
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const attributeNode = lastAttributeNode[getOpeningElementId(node)];
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const cachedLastAttributeEndPos = attributeNode ? attributeNode.range[1] : null;
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let expectedNextLine;
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const tokens = getTokensLocations(node);
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const expectedLocation = getExpectedLocation(tokens);
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if (hasCorrectLocation(tokens, expectedLocation)) {
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return;
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}
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const data = {location: MESSAGE_LOCATION[expectedLocation], details: ''};
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const correctColumn = getCorrectColumn(tokens, expectedLocation);
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if (correctColumn !== null) {
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expectedNextLine = tokens.lastProp &&
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(tokens.lastProp.lastLine === tokens.closing.line);
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data.details = ` (expected column ${correctColumn + 1}${expectedNextLine ? ' on the next line)' : ')'}`;
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}
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context.report({
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node,
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loc: tokens.closing,
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message: MESSAGE,
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data,
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fix(fixer) {
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const closingTag = tokens.selfClosing ? '/>' : '>';
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switch (expectedLocation) {
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case 'after-tag':
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if (cachedLastAttributeEndPos) {
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return fixer.replaceTextRange([cachedLastAttributeEndPos, node.range[1]],
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(expectedNextLine ? '\n' : '') + closingTag);
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}
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return fixer.replaceTextRange([node.name.range[1], node.range[1]],
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(expectedNextLine ? '\n' : ' ') + closingTag);
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case 'after-props':
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return fixer.replaceTextRange([cachedLastAttributeEndPos, node.range[1]],
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(expectedNextLine ? '\n' : '') + closingTag);
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case 'props-aligned':
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case 'tag-aligned':
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case 'line-aligned':
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return fixer.replaceTextRange([cachedLastAttributeEndPos, node.range[1]],
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`\n${getIndentation(tokens, expectedLocation, correctColumn)}${closingTag}`);
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default:
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return true;
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}
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}
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});
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}
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};
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}
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};
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