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Initial import with skill sheet working

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LeRatierBretonnien
2024-12-04 00:11:23 +01:00
commit 9050c80ab4
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145
node_modules/commander/lib/argument.js generated vendored Normal file
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const { InvalidArgumentError } = require('./error.js');
class Argument {
/**
* Initialize a new command argument with the given name and description.
* The default is that the argument is required, and you can explicitly
* indicate this with <> around the name. Put [] around the name for an optional argument.
*
* @param {string} name
* @param {string} [description]
*/
constructor(name, description) {
this.description = description || '';
this.variadic = false;
this.parseArg = undefined;
this.defaultValue = undefined;
this.defaultValueDescription = undefined;
this.argChoices = undefined;
switch (name[0]) {
case '<': // e.g. <required>
this.required = true;
this._name = name.slice(1, -1);
break;
case '[': // e.g. [optional]
this.required = false;
this._name = name.slice(1, -1);
break;
default:
this.required = true;
this._name = name;
break;
}
if (this._name.length > 3 && this._name.slice(-3) === '...') {
this.variadic = true;
this._name = this._name.slice(0, -3);
}
}
/**
* Return argument name.
*
* @return {string}
*/
name() {
return this._name;
}
/**
* @api private
*/
_concatValue(value, previous) {
if (previous === this.defaultValue || !Array.isArray(previous)) {
return [value];
}
return previous.concat(value);
}
/**
* Set the default value, and optionally supply the description to be displayed in the help.
*
* @param {*} value
* @param {string} [description]
* @return {Argument}
*/
default(value, description) {
this.defaultValue = value;
this.defaultValueDescription = description;
return this;
}
/**
* Set the custom handler for processing CLI command arguments into argument values.
*
* @param {Function} [fn]
* @return {Argument}
*/
argParser(fn) {
this.parseArg = fn;
return this;
}
/**
* Only allow argument value to be one of choices.
*
* @param {string[]} values
* @return {Argument}
*/
choices(values) {
this.argChoices = values.slice();
this.parseArg = (arg, previous) => {
if (!this.argChoices.includes(arg)) {
throw new InvalidArgumentError(`Allowed choices are ${this.argChoices.join(', ')}.`);
}
if (this.variadic) {
return this._concatValue(arg, previous);
}
return arg;
};
return this;
}
/**
* Make argument required.
*/
argRequired() {
this.required = true;
return this;
}
/**
* Make argument optional.
*/
argOptional() {
this.required = false;
return this;
}
}
/**
* Takes an argument and returns its human readable equivalent for help usage.
*
* @param {Argument} arg
* @return {string}
* @api private
*/
function humanReadableArgName(arg) {
const nameOutput = arg.name() + (arg.variadic === true ? '...' : '');
return arg.required
? '<' + nameOutput + '>'
: '[' + nameOutput + ']';
}
exports.Argument = Argument;
exports.humanReadableArgName = humanReadableArgName;

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node_modules/commander/lib/command.js generated vendored Normal file
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node_modules/commander/lib/error.js generated vendored Normal file
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/**
* CommanderError class
* @class
*/
class CommanderError extends Error {
/**
* Constructs the CommanderError class
* @param {number} exitCode suggested exit code which could be used with process.exit
* @param {string} code an id string representing the error
* @param {string} message human-readable description of the error
* @constructor
*/
constructor(exitCode, code, message) {
super(message);
// properly capture stack trace in Node.js
Error.captureStackTrace(this, this.constructor);
this.name = this.constructor.name;
this.code = code;
this.exitCode = exitCode;
this.nestedError = undefined;
}
}
/**
* InvalidArgumentError class
* @class
*/
class InvalidArgumentError extends CommanderError {
/**
* Constructs the InvalidArgumentError class
* @param {string} [message] explanation of why argument is invalid
* @constructor
*/
constructor(message) {
super(1, 'commander.invalidArgument', message);
// properly capture stack trace in Node.js
Error.captureStackTrace(this, this.constructor);
this.name = this.constructor.name;
}
}
exports.CommanderError = CommanderError;
exports.InvalidArgumentError = InvalidArgumentError;

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node_modules/commander/lib/help.js generated vendored Normal file
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const { humanReadableArgName } = require('./argument.js');
/**
* TypeScript import types for JSDoc, used by Visual Studio Code IntelliSense and `npm run typescript-checkJS`
* https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html#import-types
* @typedef { import("./argument.js").Argument } Argument
* @typedef { import("./command.js").Command } Command
* @typedef { import("./option.js").Option } Option
*/
// Although this is a class, methods are static in style to allow override using subclass or just functions.
class Help {
constructor() {
this.helpWidth = undefined;
this.sortSubcommands = false;
this.sortOptions = false;
this.showGlobalOptions = false;
}
/**
* Get an array of the visible subcommands. Includes a placeholder for the implicit help command, if there is one.
*
* @param {Command} cmd
* @returns {Command[]}
*/
visibleCommands(cmd) {
const visibleCommands = cmd.commands.filter(cmd => !cmd._hidden);
if (cmd._hasImplicitHelpCommand()) {
// Create a command matching the implicit help command.
const [, helpName, helpArgs] = cmd._helpCommandnameAndArgs.match(/([^ ]+) *(.*)/);
const helpCommand = cmd.createCommand(helpName)
.helpOption(false);
helpCommand.description(cmd._helpCommandDescription);
if (helpArgs) helpCommand.arguments(helpArgs);
visibleCommands.push(helpCommand);
}
if (this.sortSubcommands) {
visibleCommands.sort((a, b) => {
// @ts-ignore: overloaded return type
return a.name().localeCompare(b.name());
});
}
return visibleCommands;
}
/**
* Compare options for sort.
*
* @param {Option} a
* @param {Option} b
* @returns number
*/
compareOptions(a, b) {
const getSortKey = (option) => {
// WYSIWYG for order displayed in help. Short used for comparison if present. No special handling for negated.
return option.short ? option.short.replace(/^-/, '') : option.long.replace(/^--/, '');
};
return getSortKey(a).localeCompare(getSortKey(b));
}
/**
* Get an array of the visible options. Includes a placeholder for the implicit help option, if there is one.
*
* @param {Command} cmd
* @returns {Option[]}
*/
visibleOptions(cmd) {
const visibleOptions = cmd.options.filter((option) => !option.hidden);
// Implicit help
const showShortHelpFlag = cmd._hasHelpOption && cmd._helpShortFlag && !cmd._findOption(cmd._helpShortFlag);
const showLongHelpFlag = cmd._hasHelpOption && !cmd._findOption(cmd._helpLongFlag);
if (showShortHelpFlag || showLongHelpFlag) {
let helpOption;
if (!showShortHelpFlag) {
helpOption = cmd.createOption(cmd._helpLongFlag, cmd._helpDescription);
} else if (!showLongHelpFlag) {
helpOption = cmd.createOption(cmd._helpShortFlag, cmd._helpDescription);
} else {
helpOption = cmd.createOption(cmd._helpFlags, cmd._helpDescription);
}
visibleOptions.push(helpOption);
}
if (this.sortOptions) {
visibleOptions.sort(this.compareOptions);
}
return visibleOptions;
}
/**
* Get an array of the visible global options. (Not including help.)
*
* @param {Command} cmd
* @returns {Option[]}
*/
visibleGlobalOptions(cmd) {
if (!this.showGlobalOptions) return [];
const globalOptions = [];
for (let ancestorCmd = cmd.parent; ancestorCmd; ancestorCmd = ancestorCmd.parent) {
const visibleOptions = ancestorCmd.options.filter((option) => !option.hidden);
globalOptions.push(...visibleOptions);
}
if (this.sortOptions) {
globalOptions.sort(this.compareOptions);
}
return globalOptions;
}
/**
* Get an array of the arguments if any have a description.
*
* @param {Command} cmd
* @returns {Argument[]}
*/
visibleArguments(cmd) {
// Side effect! Apply the legacy descriptions before the arguments are displayed.
if (cmd._argsDescription) {
cmd.registeredArguments.forEach(argument => {
argument.description = argument.description || cmd._argsDescription[argument.name()] || '';
});
}
// If there are any arguments with a description then return all the arguments.
if (cmd.registeredArguments.find(argument => argument.description)) {
return cmd.registeredArguments;
}
return [];
}
/**
* Get the command term to show in the list of subcommands.
*
* @param {Command} cmd
* @returns {string}
*/
subcommandTerm(cmd) {
// Legacy. Ignores custom usage string, and nested commands.
const args = cmd.registeredArguments.map(arg => humanReadableArgName(arg)).join(' ');
return cmd._name +
(cmd._aliases[0] ? '|' + cmd._aliases[0] : '') +
(cmd.options.length ? ' [options]' : '') + // simplistic check for non-help option
(args ? ' ' + args : '');
}
/**
* Get the option term to show in the list of options.
*
* @param {Option} option
* @returns {string}
*/
optionTerm(option) {
return option.flags;
}
/**
* Get the argument term to show in the list of arguments.
*
* @param {Argument} argument
* @returns {string}
*/
argumentTerm(argument) {
return argument.name();
}
/**
* Get the longest command term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
longestSubcommandTermLength(cmd, helper) {
return helper.visibleCommands(cmd).reduce((max, command) => {
return Math.max(max, helper.subcommandTerm(command).length);
}, 0);
}
/**
* Get the longest option term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
longestOptionTermLength(cmd, helper) {
return helper.visibleOptions(cmd).reduce((max, option) => {
return Math.max(max, helper.optionTerm(option).length);
}, 0);
}
/**
* Get the longest global option term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
longestGlobalOptionTermLength(cmd, helper) {
return helper.visibleGlobalOptions(cmd).reduce((max, option) => {
return Math.max(max, helper.optionTerm(option).length);
}, 0);
}
/**
* Get the longest argument term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
longestArgumentTermLength(cmd, helper) {
return helper.visibleArguments(cmd).reduce((max, argument) => {
return Math.max(max, helper.argumentTerm(argument).length);
}, 0);
}
/**
* Get the command usage to be displayed at the top of the built-in help.
*
* @param {Command} cmd
* @returns {string}
*/
commandUsage(cmd) {
// Usage
let cmdName = cmd._name;
if (cmd._aliases[0]) {
cmdName = cmdName + '|' + cmd._aliases[0];
}
let ancestorCmdNames = '';
for (let ancestorCmd = cmd.parent; ancestorCmd; ancestorCmd = ancestorCmd.parent) {
ancestorCmdNames = ancestorCmd.name() + ' ' + ancestorCmdNames;
}
return ancestorCmdNames + cmdName + ' ' + cmd.usage();
}
/**
* Get the description for the command.
*
* @param {Command} cmd
* @returns {string}
*/
commandDescription(cmd) {
// @ts-ignore: overloaded return type
return cmd.description();
}
/**
* Get the subcommand summary to show in the list of subcommands.
* (Fallback to description for backwards compatibility.)
*
* @param {Command} cmd
* @returns {string}
*/
subcommandDescription(cmd) {
// @ts-ignore: overloaded return type
return cmd.summary() || cmd.description();
}
/**
* Get the option description to show in the list of options.
*
* @param {Option} option
* @return {string}
*/
optionDescription(option) {
const extraInfo = [];
if (option.argChoices) {
extraInfo.push(
// use stringify to match the display of the default value
`choices: ${option.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`);
}
if (option.defaultValue !== undefined) {
// default for boolean and negated more for programmer than end user,
// but show true/false for boolean option as may be for hand-rolled env or config processing.
const showDefault = option.required || option.optional ||
(option.isBoolean() && typeof option.defaultValue === 'boolean');
if (showDefault) {
extraInfo.push(`default: ${option.defaultValueDescription || JSON.stringify(option.defaultValue)}`);
}
}
// preset for boolean and negated are more for programmer than end user
if (option.presetArg !== undefined && option.optional) {
extraInfo.push(`preset: ${JSON.stringify(option.presetArg)}`);
}
if (option.envVar !== undefined) {
extraInfo.push(`env: ${option.envVar}`);
}
if (extraInfo.length > 0) {
return `${option.description} (${extraInfo.join(', ')})`;
}
return option.description;
}
/**
* Get the argument description to show in the list of arguments.
*
* @param {Argument} argument
* @return {string}
*/
argumentDescription(argument) {
const extraInfo = [];
if (argument.argChoices) {
extraInfo.push(
// use stringify to match the display of the default value
`choices: ${argument.argChoices.map((choice) => JSON.stringify(choice)).join(', ')}`);
}
if (argument.defaultValue !== undefined) {
extraInfo.push(`default: ${argument.defaultValueDescription || JSON.stringify(argument.defaultValue)}`);
}
if (extraInfo.length > 0) {
const extraDescripton = `(${extraInfo.join(', ')})`;
if (argument.description) {
return `${argument.description} ${extraDescripton}`;
}
return extraDescripton;
}
return argument.description;
}
/**
* Generate the built-in help text.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {string}
*/
formatHelp(cmd, helper) {
const termWidth = helper.padWidth(cmd, helper);
const helpWidth = helper.helpWidth || 80;
const itemIndentWidth = 2;
const itemSeparatorWidth = 2; // between term and description
function formatItem(term, description) {
if (description) {
const fullText = `${term.padEnd(termWidth + itemSeparatorWidth)}${description}`;
return helper.wrap(fullText, helpWidth - itemIndentWidth, termWidth + itemSeparatorWidth);
}
return term;
}
function formatList(textArray) {
return textArray.join('\n').replace(/^/gm, ' '.repeat(itemIndentWidth));
}
// Usage
let output = [`Usage: ${helper.commandUsage(cmd)}`, ''];
// Description
const commandDescription = helper.commandDescription(cmd);
if (commandDescription.length > 0) {
output = output.concat([helper.wrap(commandDescription, helpWidth, 0), '']);
}
// Arguments
const argumentList = helper.visibleArguments(cmd).map((argument) => {
return formatItem(helper.argumentTerm(argument), helper.argumentDescription(argument));
});
if (argumentList.length > 0) {
output = output.concat(['Arguments:', formatList(argumentList), '']);
}
// Options
const optionList = helper.visibleOptions(cmd).map((option) => {
return formatItem(helper.optionTerm(option), helper.optionDescription(option));
});
if (optionList.length > 0) {
output = output.concat(['Options:', formatList(optionList), '']);
}
if (this.showGlobalOptions) {
const globalOptionList = helper.visibleGlobalOptions(cmd).map((option) => {
return formatItem(helper.optionTerm(option), helper.optionDescription(option));
});
if (globalOptionList.length > 0) {
output = output.concat(['Global Options:', formatList(globalOptionList), '']);
}
}
// Commands
const commandList = helper.visibleCommands(cmd).map((cmd) => {
return formatItem(helper.subcommandTerm(cmd), helper.subcommandDescription(cmd));
});
if (commandList.length > 0) {
output = output.concat(['Commands:', formatList(commandList), '']);
}
return output.join('\n');
}
/**
* Calculate the pad width from the maximum term length.
*
* @param {Command} cmd
* @param {Help} helper
* @returns {number}
*/
padWidth(cmd, helper) {
return Math.max(
helper.longestOptionTermLength(cmd, helper),
helper.longestGlobalOptionTermLength(cmd, helper),
helper.longestSubcommandTermLength(cmd, helper),
helper.longestArgumentTermLength(cmd, helper)
);
}
/**
* Wrap the given string to width characters per line, with lines after the first indented.
* Do not wrap if insufficient room for wrapping (minColumnWidth), or string is manually formatted.
*
* @param {string} str
* @param {number} width
* @param {number} indent
* @param {number} [minColumnWidth=40]
* @return {string}
*
*/
wrap(str, width, indent, minColumnWidth = 40) {
// Full \s characters, minus the linefeeds.
const indents = ' \\f\\t\\v\u00a0\u1680\u2000-\u200a\u202f\u205f\u3000\ufeff';
// Detect manually wrapped and indented strings by searching for line break followed by spaces.
const manualIndent = new RegExp(`[\\n][${indents}]+`);
if (str.match(manualIndent)) return str;
// Do not wrap if not enough room for a wrapped column of text (as could end up with a word per line).
const columnWidth = width - indent;
if (columnWidth < minColumnWidth) return str;
const leadingStr = str.slice(0, indent);
const columnText = str.slice(indent).replace('\r\n', '\n');
const indentString = ' '.repeat(indent);
const zeroWidthSpace = '\u200B';
const breaks = `\\s${zeroWidthSpace}`;
// Match line end (so empty lines don't collapse),
// or as much text as will fit in column, or excess text up to first break.
const regex = new RegExp(`\n|.{1,${columnWidth - 1}}([${breaks}]|$)|[^${breaks}]+?([${breaks}]|$)`, 'g');
const lines = columnText.match(regex) || [];
return leadingStr + lines.map((line, i) => {
if (line === '\n') return ''; // preserve empty lines
return ((i > 0) ? indentString : '') + line.trimEnd();
}).join('\n');
}
}
exports.Help = Help;

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node_modules/commander/lib/option.js generated vendored Normal file
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const { InvalidArgumentError } = require('./error.js');
class Option {
/**
* Initialize a new `Option` with the given `flags` and `description`.
*
* @param {string} flags
* @param {string} [description]
*/
constructor(flags, description) {
this.flags = flags;
this.description = description || '';
this.required = flags.includes('<'); // A value must be supplied when the option is specified.
this.optional = flags.includes('['); // A value is optional when the option is specified.
// variadic test ignores <value,...> et al which might be used to describe custom splitting of single argument
this.variadic = /\w\.\.\.[>\]]$/.test(flags); // The option can take multiple values.
this.mandatory = false; // The option must have a value after parsing, which usually means it must be specified on command line.
const optionFlags = splitOptionFlags(flags);
this.short = optionFlags.shortFlag;
this.long = optionFlags.longFlag;
this.negate = false;
if (this.long) {
this.negate = this.long.startsWith('--no-');
}
this.defaultValue = undefined;
this.defaultValueDescription = undefined;
this.presetArg = undefined;
this.envVar = undefined;
this.parseArg = undefined;
this.hidden = false;
this.argChoices = undefined;
this.conflictsWith = [];
this.implied = undefined;
}
/**
* Set the default value, and optionally supply the description to be displayed in the help.
*
* @param {*} value
* @param {string} [description]
* @return {Option}
*/
default(value, description) {
this.defaultValue = value;
this.defaultValueDescription = description;
return this;
}
/**
* Preset to use when option used without option-argument, especially optional but also boolean and negated.
* The custom processing (parseArg) is called.
*
* @example
* new Option('--color').default('GREYSCALE').preset('RGB');
* new Option('--donate [amount]').preset('20').argParser(parseFloat);
*
* @param {*} arg
* @return {Option}
*/
preset(arg) {
this.presetArg = arg;
return this;
}
/**
* Add option name(s) that conflict with this option.
* An error will be displayed if conflicting options are found during parsing.
*
* @example
* new Option('--rgb').conflicts('cmyk');
* new Option('--js').conflicts(['ts', 'jsx']);
*
* @param {string | string[]} names
* @return {Option}
*/
conflicts(names) {
this.conflictsWith = this.conflictsWith.concat(names);
return this;
}
/**
* Specify implied option values for when this option is set and the implied options are not.
*
* The custom processing (parseArg) is not called on the implied values.
*
* @example
* program
* .addOption(new Option('--log', 'write logging information to file'))
* .addOption(new Option('--trace', 'log extra details').implies({ log: 'trace.txt' }));
*
* @param {Object} impliedOptionValues
* @return {Option}
*/
implies(impliedOptionValues) {
let newImplied = impliedOptionValues;
if (typeof impliedOptionValues === 'string') {
// string is not documented, but easy mistake and we can do what user probably intended.
newImplied = { [impliedOptionValues]: true };
}
this.implied = Object.assign(this.implied || {}, newImplied);
return this;
}
/**
* Set environment variable to check for option value.
*
* An environment variable is only used if when processed the current option value is
* undefined, or the source of the current value is 'default' or 'config' or 'env'.
*
* @param {string} name
* @return {Option}
*/
env(name) {
this.envVar = name;
return this;
}
/**
* Set the custom handler for processing CLI option arguments into option values.
*
* @param {Function} [fn]
* @return {Option}
*/
argParser(fn) {
this.parseArg = fn;
return this;
}
/**
* Whether the option is mandatory and must have a value after parsing.
*
* @param {boolean} [mandatory=true]
* @return {Option}
*/
makeOptionMandatory(mandatory = true) {
this.mandatory = !!mandatory;
return this;
}
/**
* Hide option in help.
*
* @param {boolean} [hide=true]
* @return {Option}
*/
hideHelp(hide = true) {
this.hidden = !!hide;
return this;
}
/**
* @api private
*/
_concatValue(value, previous) {
if (previous === this.defaultValue || !Array.isArray(previous)) {
return [value];
}
return previous.concat(value);
}
/**
* Only allow option value to be one of choices.
*
* @param {string[]} values
* @return {Option}
*/
choices(values) {
this.argChoices = values.slice();
this.parseArg = (arg, previous) => {
if (!this.argChoices.includes(arg)) {
throw new InvalidArgumentError(`Allowed choices are ${this.argChoices.join(', ')}.`);
}
if (this.variadic) {
return this._concatValue(arg, previous);
}
return arg;
};
return this;
}
/**
* Return option name.
*
* @return {string}
*/
name() {
if (this.long) {
return this.long.replace(/^--/, '');
}
return this.short.replace(/^-/, '');
}
/**
* Return option name, in a camelcase format that can be used
* as a object attribute key.
*
* @return {string}
* @api private
*/
attributeName() {
return camelcase(this.name().replace(/^no-/, ''));
}
/**
* Check if `arg` matches the short or long flag.
*
* @param {string} arg
* @return {boolean}
* @api private
*/
is(arg) {
return this.short === arg || this.long === arg;
}
/**
* Return whether a boolean option.
*
* Options are one of boolean, negated, required argument, or optional argument.
*
* @return {boolean}
* @api private
*/
isBoolean() {
return !this.required && !this.optional && !this.negate;
}
}
/**
* This class is to make it easier to work with dual options, without changing the existing
* implementation. We support separate dual options for separate positive and negative options,
* like `--build` and `--no-build`, which share a single option value. This works nicely for some
* use cases, but is tricky for others where we want separate behaviours despite
* the single shared option value.
*/
class DualOptions {
/**
* @param {Option[]} options
*/
constructor(options) {
this.positiveOptions = new Map();
this.negativeOptions = new Map();
this.dualOptions = new Set();
options.forEach(option => {
if (option.negate) {
this.negativeOptions.set(option.attributeName(), option);
} else {
this.positiveOptions.set(option.attributeName(), option);
}
});
this.negativeOptions.forEach((value, key) => {
if (this.positiveOptions.has(key)) {
this.dualOptions.add(key);
}
});
}
/**
* Did the value come from the option, and not from possible matching dual option?
*
* @param {*} value
* @param {Option} option
* @returns {boolean}
*/
valueFromOption(value, option) {
const optionKey = option.attributeName();
if (!this.dualOptions.has(optionKey)) return true;
// Use the value to deduce if (probably) came from the option.
const preset = this.negativeOptions.get(optionKey).presetArg;
const negativeValue = (preset !== undefined) ? preset : false;
return option.negate === (negativeValue === value);
}
}
/**
* Convert string from kebab-case to camelCase.
*
* @param {string} str
* @return {string}
* @api private
*/
function camelcase(str) {
return str.split('-').reduce((str, word) => {
return str + word[0].toUpperCase() + word.slice(1);
});
}
/**
* Split the short and long flag out of something like '-m,--mixed <value>'
*
* @api private
*/
function splitOptionFlags(flags) {
let shortFlag;
let longFlag;
// Use original very loose parsing to maintain backwards compatibility for now,
// which allowed for example unintended `-sw, --short-word` [sic].
const flagParts = flags.split(/[ |,]+/);
if (flagParts.length > 1 && !/^[[<]/.test(flagParts[1])) shortFlag = flagParts.shift();
longFlag = flagParts.shift();
// Add support for lone short flag without significantly changing parsing!
if (!shortFlag && /^-[^-]$/.test(longFlag)) {
shortFlag = longFlag;
longFlag = undefined;
}
return { shortFlag, longFlag };
}
exports.Option = Option;
exports.splitOptionFlags = splitOptionFlags;
exports.DualOptions = DualOptions;

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node_modules/commander/lib/suggestSimilar.js generated vendored Normal file
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const maxDistance = 3;
function editDistance(a, b) {
// https://en.wikipedia.org/wiki/Damerau–Levenshtein_distance
// Calculating optimal string alignment distance, no substring is edited more than once.
// (Simple implementation.)
// Quick early exit, return worst case.
if (Math.abs(a.length - b.length) > maxDistance) return Math.max(a.length, b.length);
// distance between prefix substrings of a and b
const d = [];
// pure deletions turn a into empty string
for (let i = 0; i <= a.length; i++) {
d[i] = [i];
}
// pure insertions turn empty string into b
for (let j = 0; j <= b.length; j++) {
d[0][j] = j;
}
// fill matrix
for (let j = 1; j <= b.length; j++) {
for (let i = 1; i <= a.length; i++) {
let cost = 1;
if (a[i - 1] === b[j - 1]) {
cost = 0;
} else {
cost = 1;
}
d[i][j] = Math.min(
d[i - 1][j] + 1, // deletion
d[i][j - 1] + 1, // insertion
d[i - 1][j - 1] + cost // substitution
);
// transposition
if (i > 1 && j > 1 && a[i - 1] === b[j - 2] && a[i - 2] === b[j - 1]) {
d[i][j] = Math.min(d[i][j], d[i - 2][j - 2] + 1);
}
}
}
return d[a.length][b.length];
}
/**
* Find close matches, restricted to same number of edits.
*
* @param {string} word
* @param {string[]} candidates
* @returns {string}
*/
function suggestSimilar(word, candidates) {
if (!candidates || candidates.length === 0) return '';
// remove possible duplicates
candidates = Array.from(new Set(candidates));
const searchingOptions = word.startsWith('--');
if (searchingOptions) {
word = word.slice(2);
candidates = candidates.map(candidate => candidate.slice(2));
}
let similar = [];
let bestDistance = maxDistance;
const minSimilarity = 0.4;
candidates.forEach((candidate) => {
if (candidate.length <= 1) return; // no one character guesses
const distance = editDistance(word, candidate);
const length = Math.max(word.length, candidate.length);
const similarity = (length - distance) / length;
if (similarity > minSimilarity) {
if (distance < bestDistance) {
// better edit distance, throw away previous worse matches
bestDistance = distance;
similar = [candidate];
} else if (distance === bestDistance) {
similar.push(candidate);
}
}
});
similar.sort((a, b) => a.localeCompare(b));
if (searchingOptions) {
similar = similar.map(candidate => `--${candidate}`);
}
if (similar.length > 1) {
return `\n(Did you mean one of ${similar.join(', ')}?)`;
}
if (similar.length === 1) {
return `\n(Did you mean ${similar[0]}?)`;
}
return '';
}
exports.suggestSimilar = suggestSimilar;