672 lines
26 KiB
JavaScript
672 lines
26 KiB
JavaScript
/**
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* @fileoverview Rule to specify spacing of object literal keys and values
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* @author Brandon Mills
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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 astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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/**
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* Checks whether a string contains a line terminator as defined in
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* http://www.ecma-international.org/ecma-262/5.1/#sec-7.3
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* @param {string} str String to test.
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* @returns {boolean} True if str contains a line terminator.
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*/
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function containsLineTerminator(str) {
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return astUtils.LINEBREAK_MATCHER.test(str);
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}
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/**
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* Gets the last element of an array.
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* @param {Array} arr An array.
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* @returns {any} Last element of arr.
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*/
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function last(arr) {
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return arr[arr.length - 1];
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}
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/**
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* Checks whether a node is contained on a single line.
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* @param {ASTNode} node AST Node being evaluated.
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* @returns {boolean} True if the node is a single line.
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*/
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function isSingleLine(node) {
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return (node.loc.end.line === node.loc.start.line);
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}
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/**
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* Checks whether the properties on a single line.
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* @param {ASTNode[]} properties List of Property AST nodes.
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* @returns {boolean} True if all properies is on a single line.
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*/
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function isSingleLineProperties(properties) {
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const [firstProp] = properties,
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lastProp = last(properties);
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return firstProp.loc.start.line === lastProp.loc.end.line;
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}
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/**
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* Initializes a single option property from the configuration with defaults for undefined values
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* @param {Object} toOptions Object to be initialized
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* @param {Object} fromOptions Object to be initialized from
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* @returns {Object} The object with correctly initialized options and values
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*/
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function initOptionProperty(toOptions, fromOptions) {
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toOptions.mode = fromOptions.mode || "strict";
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// Set value of beforeColon
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if (typeof fromOptions.beforeColon !== "undefined") {
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toOptions.beforeColon = +fromOptions.beforeColon;
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} else {
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toOptions.beforeColon = 0;
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}
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// Set value of afterColon
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if (typeof fromOptions.afterColon !== "undefined") {
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toOptions.afterColon = +fromOptions.afterColon;
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} else {
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toOptions.afterColon = 1;
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}
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// Set align if exists
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if (typeof fromOptions.align !== "undefined") {
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if (typeof fromOptions.align === "object") {
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toOptions.align = fromOptions.align;
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} else { // "string"
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toOptions.align = {
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on: fromOptions.align,
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mode: toOptions.mode,
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beforeColon: toOptions.beforeColon,
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afterColon: toOptions.afterColon
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};
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}
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}
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return toOptions;
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}
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/**
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* Initializes all the option values (singleLine, multiLine and align) from the configuration with defaults for undefined values
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* @param {Object} toOptions Object to be initialized
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* @param {Object} fromOptions Object to be initialized from
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* @returns {Object} The object with correctly initialized options and values
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*/
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function initOptions(toOptions, fromOptions) {
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if (typeof fromOptions.align === "object") {
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// Initialize the alignment configuration
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toOptions.align = initOptionProperty({}, fromOptions.align);
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toOptions.align.on = fromOptions.align.on || "colon";
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toOptions.align.mode = fromOptions.align.mode || "strict";
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toOptions.multiLine = initOptionProperty({}, (fromOptions.multiLine || fromOptions));
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toOptions.singleLine = initOptionProperty({}, (fromOptions.singleLine || fromOptions));
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} else { // string or undefined
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toOptions.multiLine = initOptionProperty({}, (fromOptions.multiLine || fromOptions));
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toOptions.singleLine = initOptionProperty({}, (fromOptions.singleLine || fromOptions));
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// If alignment options are defined in multiLine, pull them out into the general align configuration
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if (toOptions.multiLine.align) {
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toOptions.align = {
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on: toOptions.multiLine.align.on,
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mode: toOptions.multiLine.align.mode || toOptions.multiLine.mode,
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beforeColon: toOptions.multiLine.align.beforeColon,
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afterColon: toOptions.multiLine.align.afterColon
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};
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}
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}
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return toOptions;
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}
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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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type: "layout",
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docs: {
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description: "enforce consistent spacing between keys and values in object literal properties",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/key-spacing"
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},
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fixable: "whitespace",
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schema: [{
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anyOf: [
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{
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type: "object",
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properties: {
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align: {
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anyOf: [
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{
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enum: ["colon", "value"]
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},
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{
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type: "object",
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properties: {
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mode: {
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enum: ["strict", "minimum"]
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},
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on: {
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enum: ["colon", "value"]
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},
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beforeColon: {
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type: "boolean"
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},
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afterColon: {
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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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},
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mode: {
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enum: ["strict", "minimum"]
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},
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beforeColon: {
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type: "boolean"
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},
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afterColon: {
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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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type: "object",
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properties: {
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singleLine: {
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type: "object",
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properties: {
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mode: {
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enum: ["strict", "minimum"]
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},
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beforeColon: {
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type: "boolean"
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},
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afterColon: {
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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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multiLine: {
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type: "object",
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properties: {
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align: {
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anyOf: [
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{
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enum: ["colon", "value"]
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},
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{
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type: "object",
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properties: {
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mode: {
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enum: ["strict", "minimum"]
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},
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on: {
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enum: ["colon", "value"]
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},
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beforeColon: {
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type: "boolean"
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},
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afterColon: {
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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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},
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mode: {
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enum: ["strict", "minimum"]
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},
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beforeColon: {
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type: "boolean"
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},
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afterColon: {
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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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additionalProperties: false
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},
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{
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type: "object",
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properties: {
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singleLine: {
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type: "object",
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properties: {
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mode: {
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enum: ["strict", "minimum"]
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},
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beforeColon: {
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type: "boolean"
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},
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afterColon: {
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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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multiLine: {
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type: "object",
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properties: {
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mode: {
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enum: ["strict", "minimum"]
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},
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beforeColon: {
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type: "boolean"
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},
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afterColon: {
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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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align: {
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type: "object",
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properties: {
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mode: {
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enum: ["strict", "minimum"]
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},
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on: {
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enum: ["colon", "value"]
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},
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beforeColon: {
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type: "boolean"
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},
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afterColon: {
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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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additionalProperties: false
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}
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]
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}],
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messages: {
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extraKey: "Extra space after {{computed}}key '{{key}}'.",
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extraValue: "Extra space before value for {{computed}}key '{{key}}'.",
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missingKey: "Missing space after {{computed}}key '{{key}}'.",
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missingValue: "Missing space before value for {{computed}}key '{{key}}'."
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}
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},
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create(context) {
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/**
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* OPTIONS
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* "key-spacing": [2, {
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* beforeColon: false,
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* afterColon: true,
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* align: "colon" // Optional, or "value"
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* }
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*/
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const options = context.options[0] || {},
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ruleOptions = initOptions({}, options),
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multiLineOptions = ruleOptions.multiLine,
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singleLineOptions = ruleOptions.singleLine,
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alignmentOptions = ruleOptions.align || null;
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const sourceCode = context.getSourceCode();
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/**
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* Checks whether a property is a member of the property group it follows.
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* @param {ASTNode} lastMember The last Property known to be in the group.
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* @param {ASTNode} candidate The next Property that might be in the group.
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* @returns {boolean} True if the candidate property is part of the group.
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*/
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function continuesPropertyGroup(lastMember, candidate) {
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const groupEndLine = lastMember.loc.start.line,
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candidateStartLine = candidate.loc.start.line;
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if (candidateStartLine - groupEndLine <= 1) {
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return true;
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}
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/*
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* Check that the first comment is adjacent to the end of the group, the
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* last comment is adjacent to the candidate property, and that successive
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* comments are adjacent to each other.
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*/
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const leadingComments = sourceCode.getCommentsBefore(candidate);
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if (
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leadingComments.length &&
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leadingComments[0].loc.start.line - groupEndLine <= 1 &&
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candidateStartLine - last(leadingComments).loc.end.line <= 1
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) {
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for (let i = 1; i < leadingComments.length; i++) {
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if (leadingComments[i].loc.start.line - leadingComments[i - 1].loc.end.line > 1) {
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return false;
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}
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}
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return true;
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}
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return false;
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}
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/**
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* Determines if the given property is key-value property.
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* @param {ASTNode} property Property node to check.
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* @returns {boolean} Whether the property is a key-value property.
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*/
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function isKeyValueProperty(property) {
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return !(
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(property.method ||
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property.shorthand ||
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property.kind !== "init" || property.type !== "Property") // Could be "ExperimentalSpreadProperty" or "SpreadElement"
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);
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}
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/**
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* Starting from the given a node (a property.key node here) looks forward
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* until it finds the last token before a colon punctuator and returns it.
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* @param {ASTNode} node The node to start looking from.
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* @returns {ASTNode} The last token before a colon punctuator.
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*/
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function getLastTokenBeforeColon(node) {
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const colonToken = sourceCode.getTokenAfter(node, astUtils.isColonToken);
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return sourceCode.getTokenBefore(colonToken);
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}
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/**
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* Starting from the given a node (a property.key node here) looks forward
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* until it finds the colon punctuator and returns it.
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* @param {ASTNode} node The node to start looking from.
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* @returns {ASTNode} The colon punctuator.
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*/
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function getNextColon(node) {
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return sourceCode.getTokenAfter(node, astUtils.isColonToken);
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}
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/**
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* Gets an object literal property's key as the identifier name or string value.
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* @param {ASTNode} property Property node whose key to retrieve.
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* @returns {string} The property's key.
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*/
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function getKey(property) {
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const key = property.key;
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if (property.computed) {
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return sourceCode.getText().slice(key.range[0], key.range[1]);
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}
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return property.key.name || property.key.value;
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}
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/**
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* Reports an appropriately-formatted error if spacing is incorrect on one
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* side of the colon.
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* @param {ASTNode} property Key-value pair in an object literal.
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* @param {string} side Side being verified - either "key" or "value".
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* @param {string} whitespace Actual whitespace string.
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* @param {int} expected Expected whitespace length.
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* @param {string} mode Value of the mode as "strict" or "minimum"
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* @returns {void}
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*/
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function report(property, side, whitespace, expected, mode) {
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const diff = whitespace.length - expected,
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nextColon = getNextColon(property.key),
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tokenBeforeColon = sourceCode.getTokenBefore(nextColon, { includeComments: true }),
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tokenAfterColon = sourceCode.getTokenAfter(nextColon, { includeComments: true }),
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isKeySide = side === "key",
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locStart = isKeySide ? tokenBeforeColon.loc.start : tokenAfterColon.loc.start,
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isExtra = diff > 0,
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diffAbs = Math.abs(diff),
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spaces = Array(diffAbs + 1).join(" ");
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if ((
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diff && mode === "strict" ||
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diff < 0 && mode === "minimum" ||
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diff > 0 && !expected && mode === "minimum") &&
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!(expected && containsLineTerminator(whitespace))
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) {
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let fix;
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if (isExtra) {
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let range;
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// Remove whitespace
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if (isKeySide) {
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range = [tokenBeforeColon.range[1], tokenBeforeColon.range[1] + diffAbs];
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} else {
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range = [tokenAfterColon.range[0] - diffAbs, tokenAfterColon.range[0]];
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}
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fix = function(fixer) {
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return fixer.removeRange(range);
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};
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} else {
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// Add whitespace
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if (isKeySide) {
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fix = function(fixer) {
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return fixer.insertTextAfter(tokenBeforeColon, spaces);
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};
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} else {
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fix = function(fixer) {
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return fixer.insertTextBefore(tokenAfterColon, spaces);
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};
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}
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}
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let messageId = "";
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if (isExtra) {
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messageId = side === "key" ? "extraKey" : "extraValue";
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} else {
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messageId = side === "key" ? "missingKey" : "missingValue";
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}
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context.report({
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node: property[side],
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loc: locStart,
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messageId,
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data: {
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computed: property.computed ? "computed " : "",
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key: getKey(property)
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},
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fix
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});
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}
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}
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/**
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* Gets the number of characters in a key, including quotes around string
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* keys and braces around computed property keys.
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* @param {ASTNode} property Property of on object literal.
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* @returns {int} Width of the key.
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*/
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function getKeyWidth(property) {
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const startToken = sourceCode.getFirstToken(property);
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const endToken = getLastTokenBeforeColon(property.key);
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return endToken.range[1] - startToken.range[0];
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}
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/**
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* Gets the whitespace around the colon in an object literal property.
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* @param {ASTNode} property Property node from an object literal.
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* @returns {Object} Whitespace before and after the property's colon.
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*/
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function getPropertyWhitespace(property) {
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const whitespace = /(\s*):(\s*)/u.exec(sourceCode.getText().slice(
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property.key.range[1], property.value.range[0]
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));
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if (whitespace) {
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return {
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beforeColon: whitespace[1],
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afterColon: whitespace[2]
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};
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}
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return null;
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}
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/**
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* Creates groups of properties.
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* @param {ASTNode} node ObjectExpression node being evaluated.
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* @returns {Array.<ASTNode[]>} Groups of property AST node lists.
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*/
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function createGroups(node) {
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if (node.properties.length === 1) {
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return [node.properties];
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}
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return node.properties.reduce((groups, property) => {
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const currentGroup = last(groups),
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prev = last(currentGroup);
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if (!prev || continuesPropertyGroup(prev, property)) {
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currentGroup.push(property);
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} else {
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groups.push([property]);
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}
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return groups;
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}, [
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[]
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]);
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}
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/**
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* Verifies correct vertical alignment of a group of properties.
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* @param {ASTNode[]} properties List of Property AST nodes.
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* @returns {void}
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*/
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function verifyGroupAlignment(properties) {
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const length = properties.length,
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widths = properties.map(getKeyWidth), // Width of keys, including quotes
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align = alignmentOptions.on; // "value" or "colon"
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let targetWidth = Math.max(...widths),
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beforeColon, afterColon, mode;
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if (alignmentOptions && length > 1) { // When aligning values within a group, use the alignment configuration.
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beforeColon = alignmentOptions.beforeColon;
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afterColon = alignmentOptions.afterColon;
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mode = alignmentOptions.mode;
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} else {
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beforeColon = multiLineOptions.beforeColon;
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afterColon = multiLineOptions.afterColon;
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mode = alignmentOptions.mode;
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}
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// Conditionally include one space before or after colon
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targetWidth += (align === "colon" ? beforeColon : afterColon);
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for (let i = 0; i < length; i++) {
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const property = properties[i];
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const whitespace = getPropertyWhitespace(property);
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if (whitespace) { // Object literal getters/setters lack a colon
|
|
const width = widths[i];
|
|
|
|
if (align === "value") {
|
|
report(property, "key", whitespace.beforeColon, beforeColon, mode);
|
|
report(property, "value", whitespace.afterColon, targetWidth - width, mode);
|
|
} else { // align = "colon"
|
|
report(property, "key", whitespace.beforeColon, targetWidth - width, mode);
|
|
report(property, "value", whitespace.afterColon, afterColon, mode);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Verifies spacing of property conforms to specified options.
|
|
* @param {ASTNode} node Property node being evaluated.
|
|
* @param {Object} lineOptions Configured singleLine or multiLine options
|
|
* @returns {void}
|
|
*/
|
|
function verifySpacing(node, lineOptions) {
|
|
const actual = getPropertyWhitespace(node);
|
|
|
|
if (actual) { // Object literal getters/setters lack colons
|
|
report(node, "key", actual.beforeColon, lineOptions.beforeColon, lineOptions.mode);
|
|
report(node, "value", actual.afterColon, lineOptions.afterColon, lineOptions.mode);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Verifies spacing of each property in a list.
|
|
* @param {ASTNode[]} properties List of Property AST nodes.
|
|
* @param {Object} lineOptions Configured singleLine or multiLine options
|
|
* @returns {void}
|
|
*/
|
|
function verifyListSpacing(properties, lineOptions) {
|
|
const length = properties.length;
|
|
|
|
for (let i = 0; i < length; i++) {
|
|
verifySpacing(properties[i], lineOptions);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Verifies vertical alignment, taking into account groups of properties.
|
|
* @param {ASTNode} node ObjectExpression node being evaluated.
|
|
* @returns {void}
|
|
*/
|
|
function verifyAlignment(node) {
|
|
createGroups(node).forEach(group => {
|
|
const properties = group.filter(isKeyValueProperty);
|
|
|
|
if (properties.length > 0 && isSingleLineProperties(properties)) {
|
|
verifyListSpacing(properties, multiLineOptions);
|
|
} else {
|
|
verifyGroupAlignment(properties);
|
|
}
|
|
});
|
|
}
|
|
|
|
//--------------------------------------------------------------------------
|
|
// Public API
|
|
//--------------------------------------------------------------------------
|
|
|
|
if (alignmentOptions) { // Verify vertical alignment
|
|
|
|
return {
|
|
ObjectExpression(node) {
|
|
if (isSingleLine(node)) {
|
|
verifyListSpacing(node.properties.filter(isKeyValueProperty), singleLineOptions);
|
|
} else {
|
|
verifyAlignment(node);
|
|
}
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
// Obey beforeColon and afterColon in each property as configured
|
|
return {
|
|
Property(node) {
|
|
verifySpacing(node, isSingleLine(node.parent) ? singleLineOptions : multiLineOptions);
|
|
}
|
|
};
|
|
|
|
|
|
}
|
|
};
|