407 lines
14 KiB
JavaScript
407 lines
14 KiB
JavaScript
/**
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* @fileoverview Enforce or disallow spaces inside of curly braces in JSX attributes.
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* @author Jamund Ferguson
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* @author Brandyn Bennett
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* @author Michael Ficarra
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* @author Vignesh Anand
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* @author Jamund Ferguson
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* @author Yannick Croissant
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* @author Erik Wendel
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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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const SPACING = {
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always: 'always',
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never: 'never'
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};
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const SPACING_VALUES = [SPACING.always, SPACING.never];
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module.exports = {
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meta: {
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docs: {
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description: 'Enforce or disallow spaces inside of curly braces in JSX attributes',
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category: 'Stylistic Issues',
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recommended: false,
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url: docsUrl('jsx-curly-spacing')
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},
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fixable: 'code',
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schema: {
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definitions: {
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basicConfig: {
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type: 'object',
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properties: {
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when: {
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enum: SPACING_VALUES
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},
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allowMultiline: {
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type: 'boolean'
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},
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spacing: {
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type: 'object',
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properties: {
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objectLiterals: {
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enum: SPACING_VALUES
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}
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}
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}
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}
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},
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basicConfigOrBoolean: {
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oneOf: [{
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$ref: '#/definitions/basicConfig'
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}, {
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type: 'boolean'
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}]
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}
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},
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type: 'array',
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items: [{
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oneOf: [{
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allOf: [{
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$ref: '#/definitions/basicConfig'
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}, {
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type: 'object',
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properties: {
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attributes: {
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$ref: '#/definitions/basicConfigOrBoolean'
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},
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children: {
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$ref: '#/definitions/basicConfigOrBoolean'
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}
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}
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}]
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}, {
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enum: SPACING_VALUES
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}]
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}, {
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type: 'object',
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properties: {
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allowMultiline: {
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type: 'boolean'
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},
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spacing: {
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type: 'object',
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properties: {
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objectLiterals: {
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enum: SPACING_VALUES
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}
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}
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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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create(context) {
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function normalizeConfig(configOrTrue, defaults, lastPass) {
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const config = configOrTrue === true ? {} : configOrTrue;
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const when = config.when || defaults.when;
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const allowMultiline = has(config, 'allowMultiline') ? config.allowMultiline : defaults.allowMultiline;
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const spacing = config.spacing || {};
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let objectLiteralSpaces = spacing.objectLiterals || defaults.objectLiteralSpaces;
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if (lastPass) {
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// On the final pass assign the values that should be derived from others if they are still undefined
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objectLiteralSpaces = objectLiteralSpaces || when;
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}
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return {
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when,
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allowMultiline,
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objectLiteralSpaces
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};
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}
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const DEFAULT_WHEN = SPACING.never;
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const DEFAULT_ALLOW_MULTILINE = true;
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const DEFAULT_ATTRIBUTES = true;
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const DEFAULT_CHILDREN = false;
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let originalConfig = context.options[0] || {};
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if (SPACING_VALUES.indexOf(originalConfig) !== -1) {
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originalConfig = Object.assign({when: context.options[0]}, context.options[1]);
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}
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const defaultConfig = normalizeConfig(originalConfig, {
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when: DEFAULT_WHEN,
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allowMultiline: DEFAULT_ALLOW_MULTILINE
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});
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const attributes = has(originalConfig, 'attributes') ? originalConfig.attributes : DEFAULT_ATTRIBUTES;
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const attributesConfig = attributes ? normalizeConfig(attributes, defaultConfig, true) : null;
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const children = has(originalConfig, 'children') ? originalConfig.children : DEFAULT_CHILDREN;
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const childrenConfig = children ? normalizeConfig(children, defaultConfig, true) : null;
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// --------------------------------------------------------------------------
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// Helpers
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// --------------------------------------------------------------------------
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/**
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* Determines whether two adjacent tokens have a newline between them.
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* @param {Object} left - The left token object.
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* @param {Object} right - The right token object.
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* @returns {boolean} Whether or not there is a newline between the tokens.
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*/
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function isMultiline(left, right) {
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return left.loc.end.line !== right.loc.start.line;
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}
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/**
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* Trims text of whitespace between two ranges
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* @param {Fixer} fixer - the eslint fixer object
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* @param {number} fromLoc - the start location
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* @param {number} toLoc - the end location
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* @param {string} mode - either 'start' or 'end'
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* @param {string=} spacing - a spacing value that will optionally add a space to the removed text
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* @returns {Object|*|{range, text}}
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*/
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function fixByTrimmingWhitespace(fixer, fromLoc, toLoc, mode, spacing) {
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let replacementText = context.getSourceCode().text.slice(fromLoc, toLoc);
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if (mode === 'start') {
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replacementText = replacementText.replace(/^\s+/gm, '');
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} else {
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replacementText = replacementText.replace(/\s+$/gm, '');
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}
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if (spacing === SPACING.always) {
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if (mode === 'start') {
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replacementText += ' ';
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} else {
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replacementText = ` ${replacementText}`;
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}
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}
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return fixer.replaceTextRange([fromLoc, toLoc], replacementText);
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}
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/**
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* Reports that there shouldn't be a newline after the first token
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* @param {ASTNode} node - The node to report in the event of an error.
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* @param {Token} token - The token to use for the report.
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* @param {string} spacing
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* @returns {void}
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*/
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function reportNoBeginningNewline(node, token, spacing) {
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context.report({
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node,
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loc: token.loc.start,
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message: `There should be no newline after '${token.value}'`,
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fix(fixer) {
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const nextToken = context.getSourceCode().getTokenAfter(token);
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return fixByTrimmingWhitespace(fixer, token.range[1], nextToken.range[0], 'start', spacing);
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}
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});
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}
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/**
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* Reports that there shouldn't be a newline before the last token
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* @param {ASTNode} node - The node to report in the event of an error.
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* @param {Token} token - The token to use for the report.
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* @param {string} spacing
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* @returns {void}
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*/
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function reportNoEndingNewline(node, token, spacing) {
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context.report({
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node,
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loc: token.loc.start,
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message: `There should be no newline before '${token.value}'`,
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fix(fixer) {
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const previousToken = context.getSourceCode().getTokenBefore(token);
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return fixByTrimmingWhitespace(fixer, previousToken.range[1], token.range[0], 'end', spacing);
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}
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});
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}
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/**
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* Reports that there shouldn't be a space after the first token
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* @param {ASTNode} node - The node to report in the event of an error.
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* @param {Token} token - The token to use for the report.
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* @returns {void}
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*/
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function reportNoBeginningSpace(node, token) {
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context.report({
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node,
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loc: token.loc.start,
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message: `There should be no space after '${token.value}'`,
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fix(fixer) {
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const sourceCode = context.getSourceCode();
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const nextToken = sourceCode.getTokenAfter(token);
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let nextComment;
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// ESLint >=4.x
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if (sourceCode.getCommentsAfter) {
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nextComment = sourceCode.getCommentsAfter(token);
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// ESLint 3.x
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} else {
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const potentialComment = sourceCode.getTokenAfter(token, {includeComments: true});
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nextComment = nextToken === potentialComment ? [] : [potentialComment];
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}
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// Take comments into consideration to narrow the fix range to what is actually affected. (See #1414)
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if (nextComment.length > 0) {
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return fixByTrimmingWhitespace(fixer, token.range[1], Math.min(nextToken.range[0], nextComment[0].start), 'start');
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}
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return fixByTrimmingWhitespace(fixer, token.range[1], nextToken.range[0], 'start');
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}
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});
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}
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/**
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* Reports that there shouldn't be a space before the last token
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* @param {ASTNode} node - The node to report in the event of an error.
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* @param {Token} token - The token to use for the report.
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* @returns {void}
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*/
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function reportNoEndingSpace(node, token) {
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context.report({
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node,
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loc: token.loc.start,
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message: `There should be no space before '${token.value}'`,
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fix(fixer) {
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const sourceCode = context.getSourceCode();
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const previousToken = sourceCode.getTokenBefore(token);
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let previousComment;
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// ESLint >=4.x
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if (sourceCode.getCommentsBefore) {
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previousComment = sourceCode.getCommentsBefore(token);
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// ESLint 3.x
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} else {
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const potentialComment = sourceCode.getTokenBefore(token, {includeComments: true});
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previousComment = previousToken === potentialComment ? [] : [potentialComment];
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}
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// Take comments into consideration to narrow the fix range to what is actually affected. (See #1414)
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if (previousComment.length > 0) {
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return fixByTrimmingWhitespace(fixer, Math.max(previousToken.range[1], previousComment[0].end), token.range[0], 'end');
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}
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return fixByTrimmingWhitespace(fixer, previousToken.range[1], token.range[0], 'end');
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}
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});
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}
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/**
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* Reports that there should be a space after the first token
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* @param {ASTNode} node - The node to report in the event of an error.
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* @param {Token} token - The token to use for the report.
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* @returns {void}
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*/
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function reportRequiredBeginningSpace(node, token) {
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context.report({
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node,
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loc: token.loc.start,
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message: `A space is required after '${token.value}'`,
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fix(fixer) {
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return fixer.insertTextAfter(token, ' ');
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}
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});
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}
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/**
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* Reports that there should be a space before the last token
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* @param {ASTNode} node - The node to report in the event of an error.
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* @param {Token} token - The token to use for the report.
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* @returns {void}
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*/
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function reportRequiredEndingSpace(node, token) {
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context.report({
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node,
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loc: token.loc.start,
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message: `A space is required before '${token.value}'`,
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fix(fixer) {
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return fixer.insertTextBefore(token, ' ');
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}
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});
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}
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/**
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* Determines if spacing in curly braces is valid.
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* @param {ASTNode} node The AST node to check.
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* @returns {void}
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*/
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function validateBraceSpacing(node) {
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let config;
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switch (node.parent.type) {
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case 'JSXAttribute':
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case 'JSXOpeningElement':
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config = attributesConfig;
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break;
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case 'JSXElement':
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case 'JSXFragment':
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config = childrenConfig;
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break;
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default:
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return;
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}
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if (config === null) {
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return;
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}
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const sourceCode = context.getSourceCode();
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const first = context.getFirstToken(node);
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const last = sourceCode.getLastToken(node);
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let second = context.getTokenAfter(first, {includeComments: true});
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let penultimate = sourceCode.getTokenBefore(last, {includeComments: true});
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if (!second) {
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second = context.getTokenAfter(first);
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const leadingComments = sourceCode.getNodeByRangeIndex(second.range[0]).leadingComments;
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second = leadingComments ? leadingComments[0] : second;
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}
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if (!penultimate) {
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penultimate = sourceCode.getTokenBefore(last);
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const trailingComments = sourceCode.getNodeByRangeIndex(penultimate.range[0]).trailingComments;
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penultimate = trailingComments ? trailingComments[trailingComments.length - 1] : penultimate;
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}
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const isObjectLiteral = first.value === second.value;
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const spacing = isObjectLiteral ? config.objectLiteralSpaces : config.when;
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if (spacing === SPACING.always) {
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if (!sourceCode.isSpaceBetweenTokens(first, second)) {
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reportRequiredBeginningSpace(node, first);
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} else if (!config.allowMultiline && isMultiline(first, second)) {
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reportNoBeginningNewline(node, first, spacing);
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}
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if (!sourceCode.isSpaceBetweenTokens(penultimate, last)) {
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reportRequiredEndingSpace(node, last);
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} else if (!config.allowMultiline && isMultiline(penultimate, last)) {
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reportNoEndingNewline(node, last, spacing);
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}
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} else if (spacing === SPACING.never) {
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if (isMultiline(first, second)) {
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if (!config.allowMultiline) {
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reportNoBeginningNewline(node, first, spacing);
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}
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} else if (sourceCode.isSpaceBetweenTokens(first, second)) {
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reportNoBeginningSpace(node, first);
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}
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if (isMultiline(penultimate, last)) {
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if (!config.allowMultiline) {
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reportNoEndingNewline(node, last, spacing);
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}
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} else if (sourceCode.isSpaceBetweenTokens(penultimate, last)) {
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reportNoEndingSpace(node, last);
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}
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}
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}
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// --------------------------------------------------------------------------
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// Public
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// --------------------------------------------------------------------------
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return {
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JSXExpressionContainer: validateBraceSpacing,
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JSXSpreadAttribute: validateBraceSpacing
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};
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}
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};
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