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How to use colon method in wpt

Best JavaScript code snippet using wpt

key-spacing.js

Source:key-spacing.js

1/**2 * @fileoverview Rule to specify spacing of object literal keys and values3 * @author Brandon Mills4 */5"use strict";6//------------------------------------------------------------------------------7// Requirements8//------------------------------------------------------------------------------9const astUtils = require("../util/ast-utils");10//------------------------------------------------------------------------------11// Helpers12//------------------------------------------------------------------------------13/**14 * Checks whether a string contains a line terminator as defined in15 * http://www.ecma-international.org/ecma-262/5.1/#sec-7.316 * @param {string} str String to test.17 * @returns {boolean} True if str contains a line terminator.18 */19function containsLineTerminator(str) {20    return astUtils.LINEBREAK_MATCHER.test(str);21}22/**23 * Gets the last element of an array.24 * @param {Array} arr An array.25 * @returns {any} Last element of arr.26 */27function last(arr) {28    return arr[arr.length - 1];29}30/**31 * Checks whether a node is contained on a single line.32 * @param {ASTNode} node AST Node being evaluated.33 * @returns {boolean} True if the node is a single line.34 */35function isSingleLine(node) {36    return (node.loc.end.line === node.loc.start.line);37}38/**39 * Initializes a single option property from the configuration with defaults for undefined values40 * @param {Object} toOptions Object to be initialized41 * @param {Object} fromOptions Object to be initialized from42 * @returns {Object} The object with correctly initialized options and values43 */44function initOptionProperty(toOptions, fromOptions) {45    toOptions.mode = fromOptions.mode || "strict";46    // Set value of beforeColon47    if (typeof fromOptions.beforeColon !== "undefined") {48        toOptions.beforeColon = +fromOptions.beforeColon;49    } else {50        toOptions.beforeColon = 0;51    }52    // Set value of afterColon53    if (typeof fromOptions.afterColon !== "undefined") {54        toOptions.afterColon = +fromOptions.afterColon;55    } else {56        toOptions.afterColon = 1;57    }58    // Set align if exists59    if (typeof fromOptions.align !== "undefined") {60        if (typeof fromOptions.align === "object") {61            toOptions.align = fromOptions.align;62        } else { // "string"63            toOptions.align = {64                on: fromOptions.align,65                mode: toOptions.mode,66                beforeColon: toOptions.beforeColon,67                afterColon: toOptions.afterColon68            };69        }70    }71    return toOptions;72}73/**74 * Initializes all the option values (singleLine, multiLine and align) from the configuration with defaults for undefined values75 * @param {Object} toOptions Object to be initialized76 * @param {Object} fromOptions Object to be initialized from77 * @returns {Object} The object with correctly initialized options and values78 */79function initOptions(toOptions, fromOptions) {80    if (typeof fromOptions.align === "object") {81        // Initialize the alignment configuration82        toOptions.align = initOptionProperty({}, fromOptions.align);83        toOptions.align.on = fromOptions.align.on || "colon";84        toOptions.align.mode = fromOptions.align.mode || "strict";85        toOptions.multiLine = initOptionProperty({}, (fromOptions.multiLine || fromOptions));86        toOptions.singleLine = initOptionProperty({}, (fromOptions.singleLine || fromOptions));87    } else { // string or undefined88        toOptions.multiLine = initOptionProperty({}, (fromOptions.multiLine || fromOptions));89        toOptions.singleLine = initOptionProperty({}, (fromOptions.singleLine || fromOptions));90        // If alignment options are defined in multiLine, pull them out into the general align configuration91        if (toOptions.multiLine.align) {92            toOptions.align = {93                on: toOptions.multiLine.align.on,94                mode: toOptions.multiLine.align.mode || toOptions.multiLine.mode,95                beforeColon: toOptions.multiLine.align.beforeColon,96                afterColon: toOptions.multiLine.align.afterColon97            };98        }99    }100    return toOptions;101}102//------------------------------------------------------------------------------103// Rule Definition104//------------------------------------------------------------------------------105module.exports = {106    meta: {107        type: "layout",108        docs: {109            description: "enforce consistent spacing between keys and values in object literal properties",110            category: "Stylistic Issues",111            recommended: false,112            url: "https://eslint.org/docs/rules/key-spacing"113        },114        fixable: "whitespace",115        schema: [{116            anyOf: [117                {118                    type: "object",119                    properties: {120                        align: {121                            anyOf: [122                                {123                                    enum: ["colon", "value"]124                                },125                                {126                                    type: "object",127                                    properties: {128                                        mode: {129                                            enum: ["strict", "minimum"]130                                        },131                                        on: {132                                            enum: ["colon", "value"]133                                        },134                                        beforeColon: {135                                            type: "boolean"136                                        },137                                        afterColon: {138                                            type: "boolean"139                                        }140                                    },141                                    additionalProperties: false142                                }143                            ]144                        },145                        mode: {146                            enum: ["strict", "minimum"]147                        },148                        beforeColon: {149                            type: "boolean"150                        },151                        afterColon: {152                            type: "boolean"153                        }154                    },155                    additionalProperties: false156                },157                {158                    type: "object",159                    properties: {160                        singleLine: {161                            type: "object",162                            properties: {163                                mode: {164                                    enum: ["strict", "minimum"]165                                },166                                beforeColon: {167                                    type: "boolean"168                                },169                                afterColon: {170                                    type: "boolean"171                                }172                            },173                            additionalProperties: false174                        },175                        multiLine: {176                            type: "object",177                            properties: {178                                align: {179                                    anyOf: [180                                        {181                                            enum: ["colon", "value"]182                                        },183                                        {184                                            type: "object",185                                            properties: {186                                                mode: {187                                                    enum: ["strict", "minimum"]188                                                },189                                                on: {190                                                    enum: ["colon", "value"]191                                                },192                                                beforeColon: {193                                                    type: "boolean"194                                                },195                                                afterColon: {196                                                    type: "boolean"197                                                }198                                            },199                                            additionalProperties: false200                                        }201                                    ]202                                },203                                mode: {204                                    enum: ["strict", "minimum"]205                                },206                                beforeColon: {207                                    type: "boolean"208                                },209                                afterColon: {210                                    type: "boolean"211                                }212                            },213                            additionalProperties: false214                        }215                    },216                    additionalProperties: false217                },218                {219                    type: "object",220                    properties: {221                        singleLine: {222                            type: "object",223                            properties: {224                                mode: {225                                    enum: ["strict", "minimum"]226                                },227                                beforeColon: {228                                    type: "boolean"229                                },230                                afterColon: {231                                    type: "boolean"232                                }233                            },234                            additionalProperties: false235                        },236                        multiLine: {237                            type: "object",238                            properties: {239                                mode: {240                                    enum: ["strict", "minimum"]241                                },242                                beforeColon: {243                                    type: "boolean"244                                },245                                afterColon: {246                                    type: "boolean"247                                }248                            },249                            additionalProperties: false250                        },251                        align: {252                            type: "object",253                            properties: {254                                mode: {255                                    enum: ["strict", "minimum"]256                                },257                                on: {258                                    enum: ["colon", "value"]259                                },260                                beforeColon: {261                                    type: "boolean"262                                },263                                afterColon: {264                                    type: "boolean"265                                }266                            },267                            additionalProperties: false268                        }269                    },270                    additionalProperties: false271                }272            ]273        }],274        messages: {275            extraKey: "Extra space after {{computed}}key '{{key}}'.",276            extraValue: "Extra space before value for {{computed}}key '{{key}}'.",277            missingKey: "Missing space after {{computed}}key '{{key}}'.",278            missingValue: "Missing space before value for {{computed}}key '{{key}}'."279        }280    },281    create(context) {282        /**283         * OPTIONS284         * "key-spacing": [2, {285         *     beforeColon: false,286         *     afterColon: true,287         *     align: "colon" // Optional, or "value"288         * }289         */290        const options = context.options[0] || {},291            ruleOptions = initOptions({}, options),292            multiLineOptions = ruleOptions.multiLine,293            singleLineOptions = ruleOptions.singleLine,294            alignmentOptions = ruleOptions.align || null;295        const sourceCode = context.getSourceCode();296        /**297         * Checks whether a property is a member of the property group it follows.298         * @param {ASTNode} lastMember The last Property known to be in the group.299         * @param {ASTNode} candidate The next Property that might be in the group.300         * @returns {boolean} True if the candidate property is part of the group.301         */302        function continuesPropertyGroup(lastMember, candidate) {303            const groupEndLine = lastMember.loc.start.line,304                candidateStartLine = candidate.loc.start.line;305            if (candidateStartLine - groupEndLine <= 1) {306                return true;307            }308            /*309             * Check that the first comment is adjacent to the end of the group, the310             * last comment is adjacent to the candidate property, and that successive311             * comments are adjacent to each other.312             */313            const leadingComments = sourceCode.getCommentsBefore(candidate);314            if (315                leadingComments.length &&316                leadingComments[0].loc.start.line - groupEndLine <= 1 &&317                candidateStartLine - last(leadingComments).loc.end.line <= 1318            ) {319                for (let i = 1; i < leadingComments.length; i++) {320                    if (leadingComments[i].loc.start.line - leadingComments[i - 1].loc.end.line > 1) {321                        return false;322                    }323                }324                return true;325            }326            return false;327        }328        /**329         * Determines if the given property is key-value property.330         * @param {ASTNode} property Property node to check.331         * @returns {boolean} Whether the property is a key-value property.332         */333        function isKeyValueProperty(property) {334            return !(335                (property.method ||336                property.shorthand ||337                property.kind !== "init" || property.type !== "Property") // Could be "ExperimentalSpreadProperty" or "SpreadElement"338            );339        }340        /**341         * Starting from the given a node (a property.key node here) looks forward342         * until it finds the last token before a colon punctuator and returns it.343         * @param {ASTNode} node The node to start looking from.344         * @returns {ASTNode} The last token before a colon punctuator.345         */346        function getLastTokenBeforeColon(node) {347            const colonToken = sourceCode.getTokenAfter(node, astUtils.isColonToken);348            return sourceCode.getTokenBefore(colonToken);349        }350        /**351         * Starting from the given a node (a property.key node here) looks forward352         * until it finds the colon punctuator and returns it.353         * @param {ASTNode} node The node to start looking from.354         * @returns {ASTNode} The colon punctuator.355         */356        function getNextColon(node) {357            return sourceCode.getTokenAfter(node, astUtils.isColonToken);358        }359        /**360         * Gets an object literal property's key as the identifier name or string value.361         * @param {ASTNode} property Property node whose key to retrieve.362         * @returns {string} The property's key.363         */364        function getKey(property) {365            const key = property.key;366            if (property.computed) {367                return sourceCode.getText().slice(key.range[0], key.range[1]);368            }369            return property.key.name || property.key.value;370        }371        /**372         * Reports an appropriately-formatted error if spacing is incorrect on one373         * side of the colon.374         * @param {ASTNode} property Key-value pair in an object literal.375         * @param {string} side Side being verified - either "key" or "value".376         * @param {string} whitespace Actual whitespace string.377         * @param {int} expected Expected whitespace length.378         * @param {string} mode Value of the mode as "strict" or "minimum"379         * @returns {void}380         */381        function report(property, side, whitespace, expected, mode) {382            const diff = whitespace.length - expected,383                nextColon = getNextColon(property.key),384                tokenBeforeColon = sourceCode.getTokenBefore(nextColon, { includeComments: true }),385                tokenAfterColon = sourceCode.getTokenAfter(nextColon, { includeComments: true }),386                isKeySide = side === "key",387                locStart = isKeySide ? tokenBeforeColon.loc.start : tokenAfterColon.loc.start,388                isExtra = diff > 0,389                diffAbs = Math.abs(diff),390                spaces = Array(diffAbs + 1).join(" ");391            if ((392                diff && mode === "strict" ||393                diff < 0 && mode === "minimum" ||394                diff > 0 && !expected && mode === "minimum") &&395                !(expected && containsLineTerminator(whitespace))396            ) {397                let fix;398                if (isExtra) {399                    let range;400                    // Remove whitespace401                    if (isKeySide) {402                        range = [tokenBeforeColon.range[1], tokenBeforeColon.range[1] + diffAbs];403                    } else {404                        range = [tokenAfterColon.range[0] - diffAbs, tokenAfterColon.range[0]];405                    }406                    fix = function(fixer) {407                        return fixer.removeRange(range);408                    };409                } else {410                    // Add whitespace411                    if (isKeySide) {412                        fix = function(fixer) {413                            return fixer.insertTextAfter(tokenBeforeColon, spaces);414                        };415                    } else {416                        fix = function(fixer) {417                            return fixer.insertTextBefore(tokenAfterColon, spaces);418                        };419                    }420                }421                let messageId = "";422                if (isExtra) {423                    messageId = side === "key" ? "extraKey" : "extraValue";424                } else {425                    messageId = side === "key" ? "missingKey" : "missingValue";426                }427                context.report({428                    node: property[side],429                    loc: locStart,430                    messageId,431                    data: {432                        computed: property.computed ? "computed " : "",433                        key: getKey(property)434                    },435                    fix436                });437            }438        }439        /**440         * Gets the number of characters in a key, including quotes around string441         * keys and braces around computed property keys.442         * @param {ASTNode} property Property of on object literal.443         * @returns {int} Width of the key.444         */445        function getKeyWidth(property) {446            const startToken = sourceCode.getFirstToken(property);447            const endToken = getLastTokenBeforeColon(property.key);448            return endToken.range[1] - startToken.range[0];449        }450        /**451         * Gets the whitespace around the colon in an object literal property.452         * @param {ASTNode} property Property node from an object literal.453         * @returns {Object} Whitespace before and after the property's colon.454         */455        function getPropertyWhitespace(property) {456            const whitespace = /(\s*):(\s*)/u.exec(sourceCode.getText().slice(457                property.key.range[1], property.value.range[0]458            ));459            if (whitespace) {460                return {461                    beforeColon: whitespace[1],462                    afterColon: whitespace[2]463                };464            }465            return null;466        }467        /**468         * Creates groups of properties.469         * @param  {ASTNode} node ObjectExpression node being evaluated.470         * @returns {Array.<ASTNode[]>} Groups of property AST node lists.471         */472        function createGroups(node) {473            if (node.properties.length === 1) {474                return [node.properties];475            }476            return node.properties.reduce((groups, property) => {477                const currentGroup = last(groups),478                    prev = last(currentGroup);479                if (!prev || continuesPropertyGroup(prev, property)) {480                    currentGroup.push(property);481                } else {482                    groups.push([property]);483                }484                return groups;485            }, [486                []487            ]);488        }489        /**490         * Verifies correct vertical alignment of a group of properties.491         * @param {ASTNode[]} properties List of Property AST nodes.492         * @returns {void}493         */494        function verifyGroupAlignment(properties) {495            const length = properties.length,496                widths = properties.map(getKeyWidth), // Width of keys, including quotes497                align = alignmentOptions.on; // "value" or "colon"498            let targetWidth = Math.max(...widths),499                beforeColon, afterColon, mode;500            if (alignmentOptions && length > 1) { // When aligning values within a group, use the alignment configuration.501                beforeColon = alignmentOptions.beforeColon;502                afterColon = alignmentOptions.afterColon;503                mode = alignmentOptions.mode;504            } else {505                beforeColon = multiLineOptions.beforeColon;506                afterColon = multiLineOptions.afterColon;507                mode = alignmentOptions.mode;508            }509            // Conditionally include one space before or after colon510            targetWidth += (align === "colon" ? beforeColon : afterColon);511            for (let i = 0; i < length; i++) {512                const property = properties[i];513                const whitespace = getPropertyWhitespace(property);514                if (whitespace) { // Object literal getters/setters lack a colon515                    const width = widths[i];516                    if (align === "value") {517                        report(property, "key", whitespace.beforeColon, beforeColon, mode);518                        report(property, "value", whitespace.afterColon, targetWidth - width, mode);519                    } else { // align = "colon"520                        report(property, "key", whitespace.beforeColon, targetWidth - width, mode);521                        report(property, "value", whitespace.afterColon, afterColon, mode);522                    }523                }524            }525        }526        /**527         * Verifies vertical alignment, taking into account groups of properties.528         * @param  {ASTNode} node ObjectExpression node being evaluated.529         * @returns {void}530         */531        function verifyAlignment(node) {532            createGroups(node).forEach(group => {533                verifyGroupAlignment(group.filter(isKeyValueProperty));534            });535        }536        /**537         * Verifies spacing of property conforms to specified options.538         * @param  {ASTNode} node Property node being evaluated.539         * @param {Object} lineOptions Configured singleLine or multiLine options540         * @returns {void}541         */542        function verifySpacing(node, lineOptions) {543            const actual = getPropertyWhitespace(node);544            if (actual) { // Object literal getters/setters lack colons545                report(node, "key", actual.beforeColon, lineOptions.beforeColon, lineOptions.mode);546                report(node, "value", actual.afterColon, lineOptions.afterColon, lineOptions.mode);547            }548        }549        /**550         * Verifies spacing of each property in a list.551         * @param  {ASTNode[]} properties List of Property AST nodes.552         * @returns {void}553         */554        function verifyListSpacing(properties) {555            const length = properties.length;556            for (let i = 0; i < length; i++) {557                verifySpacing(properties[i], singleLineOptions);558            }559        }560        //--------------------------------------------------------------------------561        // Public API562        //--------------------------------------------------------------------------563        if (alignmentOptions) { // Verify vertical alignment564            return {565                ObjectExpression(node) {566                    if (isSingleLine(node)) {567                        verifyListSpacing(node.properties.filter(isKeyValueProperty));568                    } else {569                        verifyAlignment(node);570                    }571                }572            };573        }574        // Obey beforeColon and afterColon in each property as configured575        return {576            Property(node) {577                verifySpacing(node, isSingleLine(node.parent) ? singleLineOptions : multiLineOptions);578            }579        };580    }...

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