308 lines
12 KiB
JavaScript
308 lines
12 KiB
JavaScript
/**
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* @fileoverview Disallows or enforces spaces inside of object literals.
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* @author Jamund Ferguson
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*/
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"use strict";
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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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/** @type {import('../shared/types').Rule} */
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module.exports = {
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meta: {
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type: "layout",
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docs: {
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description: "enforce consistent spacing inside braces",
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recommended: false,
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url: "https://eslint.org/docs/rules/object-curly-spacing"
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},
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fixable: "whitespace",
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schema: [
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{
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enum: ["always", "never"]
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},
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{
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type: "object",
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properties: {
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arraysInObjects: {
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type: "boolean"
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},
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objectsInObjects: {
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type: "boolean"
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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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messages: {
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requireSpaceBefore: "A space is required before '{{token}}'.",
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requireSpaceAfter: "A space is required after '{{token}}'.",
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unexpectedSpaceBefore: "There should be no space before '{{token}}'.",
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unexpectedSpaceAfter: "There should be no space after '{{token}}'."
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}
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},
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create(context) {
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const spaced = context.options[0] === "always",
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sourceCode = context.getSourceCode();
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/**
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* Determines whether an option is set, relative to the spacing option.
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* If spaced is "always", then check whether option is set to false.
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* If spaced is "never", then check whether option is set to true.
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* @param {Object} option The option to exclude.
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* @returns {boolean} Whether or not the property is excluded.
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*/
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function isOptionSet(option) {
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return context.options[1] ? context.options[1][option] === !spaced : false;
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}
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const options = {
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spaced,
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arraysInObjectsException: isOptionSet("arraysInObjects"),
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objectsInObjectsException: isOptionSet("objectsInObjects")
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};
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//--------------------------------------------------------------------------
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// Helpers
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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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const nextToken = context.getSourceCode().getTokenAfter(token, { includeComments: true });
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context.report({
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node,
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loc: { start: token.loc.end, end: nextToken.loc.start },
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messageId: "unexpectedSpaceAfter",
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data: {
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token: token.value
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},
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fix(fixer) {
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return fixer.removeRange([token.range[1], nextToken.range[0]]);
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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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const previousToken = context.getSourceCode().getTokenBefore(token, { includeComments: true });
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context.report({
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node,
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loc: { start: previousToken.loc.end, end: token.loc.start },
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messageId: "unexpectedSpaceBefore",
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data: {
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token: token.value
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},
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fix(fixer) {
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return fixer.removeRange([previousToken.range[1], token.range[0]]);
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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,
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messageId: "requireSpaceAfter",
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data: {
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token: token.value
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},
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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,
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messageId: "requireSpaceBefore",
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data: {
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token: token.value
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},
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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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* @param {Token} first The first token to check (should be the opening brace)
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* @param {Token} second The second token to check (should be first after the opening brace)
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* @param {Token} penultimate The penultimate token to check (should be last before closing brace)
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* @param {Token} last The last token to check (should be closing brace)
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* @returns {void}
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*/
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function validateBraceSpacing(node, first, second, penultimate, last) {
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if (astUtils.isTokenOnSameLine(first, second)) {
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const firstSpaced = sourceCode.isSpaceBetweenTokens(first, second);
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if (options.spaced && !firstSpaced) {
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reportRequiredBeginningSpace(node, first);
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}
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if (!options.spaced && firstSpaced && second.type !== "Line") {
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reportNoBeginningSpace(node, first);
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}
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}
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if (astUtils.isTokenOnSameLine(penultimate, last)) {
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const shouldCheckPenultimate = (
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options.arraysInObjectsException && astUtils.isClosingBracketToken(penultimate) ||
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options.objectsInObjectsException && astUtils.isClosingBraceToken(penultimate)
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);
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const penultimateType = shouldCheckPenultimate && sourceCode.getNodeByRangeIndex(penultimate.range[0]).type;
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const closingCurlyBraceMustBeSpaced = (
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options.arraysInObjectsException && penultimateType === "ArrayExpression" ||
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options.objectsInObjectsException && (penultimateType === "ObjectExpression" || penultimateType === "ObjectPattern")
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) ? !options.spaced : options.spaced;
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const lastSpaced = sourceCode.isSpaceBetweenTokens(penultimate, last);
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if (closingCurlyBraceMustBeSpaced && !lastSpaced) {
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reportRequiredEndingSpace(node, last);
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}
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if (!closingCurlyBraceMustBeSpaced && lastSpaced) {
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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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* Gets '}' token of an object node.
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*
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* Because the last token of object patterns might be a type annotation,
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* this traverses tokens preceded by the last property, then returns the
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* first '}' token.
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* @param {ASTNode} node The node to get. This node is an
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* ObjectExpression or an ObjectPattern. And this node has one or
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* more properties.
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* @returns {Token} '}' token.
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*/
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function getClosingBraceOfObject(node) {
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const lastProperty = node.properties[node.properties.length - 1];
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return sourceCode.getTokenAfter(lastProperty, astUtils.isClosingBraceToken);
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}
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/**
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* Reports a given object node if spacing in curly braces is invalid.
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* @param {ASTNode} node An ObjectExpression or ObjectPattern node to check.
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* @returns {void}
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*/
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function checkForObject(node) {
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if (node.properties.length === 0) {
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return;
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}
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const first = sourceCode.getFirstToken(node),
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last = getClosingBraceOfObject(node),
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second = sourceCode.getTokenAfter(first, { includeComments: true }),
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penultimate = sourceCode.getTokenBefore(last, { includeComments: true });
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validateBraceSpacing(node, first, second, penultimate, last);
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}
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/**
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* Reports a given import node if spacing in curly braces is invalid.
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* @param {ASTNode} node An ImportDeclaration node to check.
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* @returns {void}
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*/
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function checkForImport(node) {
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if (node.specifiers.length === 0) {
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return;
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}
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let firstSpecifier = node.specifiers[0];
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const lastSpecifier = node.specifiers[node.specifiers.length - 1];
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if (lastSpecifier.type !== "ImportSpecifier") {
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return;
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}
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if (firstSpecifier.type !== "ImportSpecifier") {
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firstSpecifier = node.specifiers[1];
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}
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const first = sourceCode.getTokenBefore(firstSpecifier),
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last = sourceCode.getTokenAfter(lastSpecifier, astUtils.isNotCommaToken),
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second = sourceCode.getTokenAfter(first, { includeComments: true }),
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penultimate = sourceCode.getTokenBefore(last, { includeComments: true });
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validateBraceSpacing(node, first, second, penultimate, last);
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}
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/**
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* Reports a given export node if spacing in curly braces is invalid.
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* @param {ASTNode} node An ExportNamedDeclaration node to check.
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* @returns {void}
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*/
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function checkForExport(node) {
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if (node.specifiers.length === 0) {
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return;
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}
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const firstSpecifier = node.specifiers[0],
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lastSpecifier = node.specifiers[node.specifiers.length - 1],
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first = sourceCode.getTokenBefore(firstSpecifier),
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last = sourceCode.getTokenAfter(lastSpecifier, astUtils.isNotCommaToken),
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second = sourceCode.getTokenAfter(first, { includeComments: true }),
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penultimate = sourceCode.getTokenBefore(last, { includeComments: true });
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validateBraceSpacing(node, first, second, penultimate, last);
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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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// var {x} = y;
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ObjectPattern: checkForObject,
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// var y = {x: 'y'}
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ObjectExpression: checkForObject,
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// import {y} from 'x';
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ImportDeclaration: checkForImport,
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// export {name} from 'yo';
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ExportNamedDeclaration: checkForExport
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};
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}
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};
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