483 lines
15 KiB
JavaScript
483 lines
15 KiB
JavaScript
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/** internal
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* class ActionContainer
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*
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* Action container. Parent for [[ArgumentParser]] and [[ArgumentGroup]]
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**/
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'use strict';
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var format = require('util').format;
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// Constants
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var c = require('./const');
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var $$ = require('./utils');
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//Actions
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var ActionHelp = require('./action/help');
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var ActionAppend = require('./action/append');
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var ActionAppendConstant = require('./action/append/constant');
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var ActionCount = require('./action/count');
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var ActionStore = require('./action/store');
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var ActionStoreConstant = require('./action/store/constant');
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var ActionStoreTrue = require('./action/store/true');
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var ActionStoreFalse = require('./action/store/false');
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var ActionVersion = require('./action/version');
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var ActionSubparsers = require('./action/subparsers');
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// Errors
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var argumentErrorHelper = require('./argument/error');
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/**
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* new ActionContainer(options)
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*
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* Action container. Parent for [[ArgumentParser]] and [[ArgumentGroup]]
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*
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* ##### Options:
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*
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* - `description` -- A description of what the program does
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* - `prefixChars` -- Characters that prefix optional arguments
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* - `argumentDefault` -- The default value for all arguments
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* - `conflictHandler` -- The conflict handler to use for duplicate arguments
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**/
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var ActionContainer = module.exports = function ActionContainer(options) {
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options = options || {};
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this.description = options.description;
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this.argumentDefault = options.argumentDefault;
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this.prefixChars = options.prefixChars || '';
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this.conflictHandler = options.conflictHandler;
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// set up registries
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this._registries = {};
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// register actions
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this.register('action', null, ActionStore);
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this.register('action', 'store', ActionStore);
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this.register('action', 'storeConst', ActionStoreConstant);
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this.register('action', 'storeTrue', ActionStoreTrue);
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this.register('action', 'storeFalse', ActionStoreFalse);
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this.register('action', 'append', ActionAppend);
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this.register('action', 'appendConst', ActionAppendConstant);
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this.register('action', 'count', ActionCount);
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this.register('action', 'help', ActionHelp);
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this.register('action', 'version', ActionVersion);
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this.register('action', 'parsers', ActionSubparsers);
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// raise an exception if the conflict handler is invalid
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this._getHandler();
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// action storage
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this._actions = [];
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this._optionStringActions = {};
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// groups
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this._actionGroups = [];
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this._mutuallyExclusiveGroups = [];
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// defaults storage
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this._defaults = {};
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// determines whether an "option" looks like a negative number
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// -1, -1.5 -5e+4
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this._regexpNegativeNumber = new RegExp('^[-]?[0-9]*\\.?[0-9]+([eE][-+]?[0-9]+)?$');
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// whether or not there are any optionals that look like negative
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// numbers -- uses a list so it can be shared and edited
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this._hasNegativeNumberOptionals = [];
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};
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// Groups must be required, then ActionContainer already defined
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var ArgumentGroup = require('./argument/group');
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var MutuallyExclusiveGroup = require('./argument/exclusive');
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//
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// Registration methods
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//
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/**
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* ActionContainer#register(registryName, value, object) -> Void
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* - registryName (String) : object type action|type
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* - value (string) : keyword
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* - object (Object|Function) : handler
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*
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* Register handlers
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**/
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ActionContainer.prototype.register = function (registryName, value, object) {
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this._registries[registryName] = this._registries[registryName] || {};
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this._registries[registryName][value] = object;
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};
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ActionContainer.prototype._registryGet = function (registryName, value, defaultValue) {
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if (arguments.length < 3) {
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defaultValue = null;
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}
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return this._registries[registryName][value] || defaultValue;
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};
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//
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// Namespace default accessor methods
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//
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/**
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* ActionContainer#setDefaults(options) -> Void
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* - options (object):hash of options see [[Action.new]]
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*
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* Set defaults
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**/
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ActionContainer.prototype.setDefaults = function (options) {
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options = options || {};
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for (var property in options) {
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if ($$.has(options, property)) {
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this._defaults[property] = options[property];
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}
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}
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// if these defaults match any existing arguments, replace the previous
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// default on the object with the new one
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this._actions.forEach(function (action) {
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if ($$.has(options, action.dest)) {
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action.defaultValue = options[action.dest];
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}
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});
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};
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/**
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* ActionContainer#getDefault(dest) -> Mixed
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* - dest (string): action destination
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*
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* Return action default value
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**/
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ActionContainer.prototype.getDefault = function (dest) {
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var result = $$.has(this._defaults, dest) ? this._defaults[dest] : null;
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this._actions.forEach(function (action) {
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if (action.dest === dest && $$.has(action, 'defaultValue')) {
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result = action.defaultValue;
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}
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});
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return result;
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};
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//
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// Adding argument actions
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//
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/**
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* ActionContainer#addArgument(args, options) -> Object
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* - args (String|Array): argument key, or array of argument keys
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* - options (Object): action objects see [[Action.new]]
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*
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* #### Examples
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* - addArgument([ '-f', '--foo' ], { action: 'store', defaultValue: 1, ... })
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* - addArgument([ 'bar' ], { action: 'store', nargs: 1, ... })
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* - addArgument('--baz', { action: 'store', nargs: 1, ... })
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**/
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ActionContainer.prototype.addArgument = function (args, options) {
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args = args;
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options = options || {};
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if (typeof args === 'string') {
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args = [ args ];
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}
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if (!Array.isArray(args)) {
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throw new TypeError('addArgument first argument should be a string or an array');
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}
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if (typeof options !== 'object' || Array.isArray(options)) {
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throw new TypeError('addArgument second argument should be a hash');
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}
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// if no positional args are supplied or only one is supplied and
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// it doesn't look like an option string, parse a positional argument
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if (!args || args.length === 1 && this.prefixChars.indexOf(args[0][0]) < 0) {
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if (args && !!options.dest) {
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throw new Error('dest supplied twice for positional argument');
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}
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options = this._getPositional(args, options);
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// otherwise, we're adding an optional argument
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} else {
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options = this._getOptional(args, options);
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}
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// if no default was supplied, use the parser-level default
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if (typeof options.defaultValue === 'undefined') {
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var dest = options.dest;
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if ($$.has(this._defaults, dest)) {
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options.defaultValue = this._defaults[dest];
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} else if (typeof this.argumentDefault !== 'undefined') {
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options.defaultValue = this.argumentDefault;
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}
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}
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// create the action object, and add it to the parser
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var ActionClass = this._popActionClass(options);
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if (typeof ActionClass !== 'function') {
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throw new Error(format('Unknown action "%s".', ActionClass));
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}
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var action = new ActionClass(options);
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// throw an error if the action type is not callable
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var typeFunction = this._registryGet('type', action.type, action.type);
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if (typeof typeFunction !== 'function') {
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throw new Error(format('"%s" is not callable', typeFunction));
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}
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return this._addAction(action);
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};
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/**
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* ActionContainer#addArgumentGroup(options) -> ArgumentGroup
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* - options (Object): hash of options see [[ArgumentGroup.new]]
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*
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* Create new arguments groups
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**/
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ActionContainer.prototype.addArgumentGroup = function (options) {
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var group = new ArgumentGroup(this, options);
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this._actionGroups.push(group);
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return group;
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};
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/**
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* ActionContainer#addMutuallyExclusiveGroup(options) -> ArgumentGroup
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* - options (Object): {required: false}
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*
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* Create new mutual exclusive groups
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**/
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ActionContainer.prototype.addMutuallyExclusiveGroup = function (options) {
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var group = new MutuallyExclusiveGroup(this, options);
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this._mutuallyExclusiveGroups.push(group);
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return group;
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};
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ActionContainer.prototype._addAction = function (action) {
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var self = this;
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// resolve any conflicts
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this._checkConflict(action);
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// add to actions list
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this._actions.push(action);
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action.container = this;
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// index the action by any option strings it has
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action.optionStrings.forEach(function (optionString) {
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self._optionStringActions[optionString] = action;
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});
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// set the flag if any option strings look like negative numbers
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action.optionStrings.forEach(function (optionString) {
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if (optionString.match(self._regexpNegativeNumber)) {
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if (!self._hasNegativeNumberOptionals.some(Boolean)) {
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self._hasNegativeNumberOptionals.push(true);
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}
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}
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});
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// return the created action
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return action;
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};
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ActionContainer.prototype._removeAction = function (action) {
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var actionIndex = this._actions.indexOf(action);
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if (actionIndex >= 0) {
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this._actions.splice(actionIndex, 1);
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}
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};
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ActionContainer.prototype._addContainerActions = function (container) {
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// collect groups by titles
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var titleGroupMap = {};
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this._actionGroups.forEach(function (group) {
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if (titleGroupMap[group.title]) {
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throw new Error(format('Cannot merge actions - two groups are named "%s".', group.title));
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}
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titleGroupMap[group.title] = group;
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});
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// map each action to its group
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var groupMap = {};
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function actionHash(action) {
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// unique (hopefully?) string suitable as dictionary key
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return action.getName();
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}
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container._actionGroups.forEach(function (group) {
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// if a group with the title exists, use that, otherwise
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// create a new group matching the container's group
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if (!titleGroupMap[group.title]) {
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titleGroupMap[group.title] = this.addArgumentGroup({
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title: group.title,
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description: group.description
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});
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}
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// map the actions to their new group
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group._groupActions.forEach(function (action) {
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groupMap[actionHash(action)] = titleGroupMap[group.title];
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});
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}, this);
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// add container's mutually exclusive groups
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// NOTE: if add_mutually_exclusive_group ever gains title= and
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// description= then this code will need to be expanded as above
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var mutexGroup;
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container._mutuallyExclusiveGroups.forEach(function (group) {
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mutexGroup = this.addMutuallyExclusiveGroup({
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required: group.required
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});
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// map the actions to their new mutex group
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group._groupActions.forEach(function (action) {
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groupMap[actionHash(action)] = mutexGroup;
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});
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}, this); // forEach takes a 'this' argument
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// add all actions to this container or their group
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container._actions.forEach(function (action) {
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var key = actionHash(action);
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if (groupMap[key]) {
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groupMap[key]._addAction(action);
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} else {
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this._addAction(action);
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}
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});
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};
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ActionContainer.prototype._getPositional = function (dest, options) {
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if (Array.isArray(dest)) {
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dest = dest[0];
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}
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// make sure required is not specified
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if (options.required) {
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throw new Error('"required" is an invalid argument for positionals.');
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}
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// mark positional arguments as required if at least one is
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// always required
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if (options.nargs !== c.OPTIONAL && options.nargs !== c.ZERO_OR_MORE) {
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options.required = true;
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}
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if (options.nargs === c.ZERO_OR_MORE && typeof options.defaultValue === 'undefined') {
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options.required = true;
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}
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// return the keyword arguments with no option strings
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options.dest = dest;
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options.optionStrings = [];
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return options;
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};
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ActionContainer.prototype._getOptional = function (args, options) {
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var prefixChars = this.prefixChars;
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var optionStrings = [];
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var optionStringsLong = [];
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// determine short and long option strings
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args.forEach(function (optionString) {
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// error on strings that don't start with an appropriate prefix
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if (prefixChars.indexOf(optionString[0]) < 0) {
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throw new Error(format('Invalid option string "%s": must start with a "%s".',
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optionString,
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prefixChars
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));
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}
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// strings starting with two prefix characters are long options
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optionStrings.push(optionString);
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if (optionString.length > 1 && prefixChars.indexOf(optionString[1]) >= 0) {
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optionStringsLong.push(optionString);
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}
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});
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// infer dest, '--foo-bar' -> 'foo_bar' and '-x' -> 'x'
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var dest = options.dest || null;
|
||
|
|
delete options.dest;
|
||
|
|
|
||
|
|
if (!dest) {
|
||
|
|
var optionStringDest = optionStringsLong.length ? optionStringsLong[0] : optionStrings[0];
|
||
|
|
dest = $$.trimChars(optionStringDest, this.prefixChars);
|
||
|
|
|
||
|
|
if (dest.length === 0) {
|
||
|
|
throw new Error(
|
||
|
|
format('dest= is required for options like "%s"', optionStrings.join(', '))
|
||
|
|
);
|
||
|
|
}
|
||
|
|
dest = dest.replace(/-/g, '_');
|
||
|
|
}
|
||
|
|
|
||
|
|
// return the updated keyword arguments
|
||
|
|
options.dest = dest;
|
||
|
|
options.optionStrings = optionStrings;
|
||
|
|
|
||
|
|
return options;
|
||
|
|
};
|
||
|
|
|
||
|
|
ActionContainer.prototype._popActionClass = function (options, defaultValue) {
|
||
|
|
defaultValue = defaultValue || null;
|
||
|
|
|
||
|
|
var action = (options.action || defaultValue);
|
||
|
|
delete options.action;
|
||
|
|
|
||
|
|
var actionClass = this._registryGet('action', action, action);
|
||
|
|
return actionClass;
|
||
|
|
};
|
||
|
|
|
||
|
|
ActionContainer.prototype._getHandler = function () {
|
||
|
|
var handlerString = this.conflictHandler;
|
||
|
|
var handlerFuncName = '_handleConflict' + $$.capitalize(handlerString);
|
||
|
|
var func = this[handlerFuncName];
|
||
|
|
if (typeof func === 'undefined') {
|
||
|
|
var msg = 'invalid conflict resolution value: ' + handlerString;
|
||
|
|
throw new Error(msg);
|
||
|
|
} else {
|
||
|
|
return func;
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
ActionContainer.prototype._checkConflict = function (action) {
|
||
|
|
var optionStringActions = this._optionStringActions;
|
||
|
|
var conflictOptionals = [];
|
||
|
|
|
||
|
|
// find all options that conflict with this option
|
||
|
|
// collect pairs, the string, and an existing action that it conflicts with
|
||
|
|
action.optionStrings.forEach(function (optionString) {
|
||
|
|
var conflOptional = optionStringActions[optionString];
|
||
|
|
if (typeof conflOptional !== 'undefined') {
|
||
|
|
conflictOptionals.push([ optionString, conflOptional ]);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
|
||
|
|
if (conflictOptionals.length > 0) {
|
||
|
|
var conflictHandler = this._getHandler();
|
||
|
|
conflictHandler.call(this, action, conflictOptionals);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
ActionContainer.prototype._handleConflictError = function (action, conflOptionals) {
|
||
|
|
var conflicts = conflOptionals.map(function (pair) { return pair[0]; });
|
||
|
|
conflicts = conflicts.join(', ');
|
||
|
|
throw argumentErrorHelper(
|
||
|
|
action,
|
||
|
|
format('Conflicting option string(s): %s', conflicts)
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
ActionContainer.prototype._handleConflictResolve = function (action, conflOptionals) {
|
||
|
|
// remove all conflicting options
|
||
|
|
var self = this;
|
||
|
|
conflOptionals.forEach(function (pair) {
|
||
|
|
var optionString = pair[0];
|
||
|
|
var conflictingAction = pair[1];
|
||
|
|
// remove the conflicting option string
|
||
|
|
var i = conflictingAction.optionStrings.indexOf(optionString);
|
||
|
|
if (i >= 0) {
|
||
|
|
conflictingAction.optionStrings.splice(i, 1);
|
||
|
|
}
|
||
|
|
delete self._optionStringActions[optionString];
|
||
|
|
// if the option now has no option string, remove it from the
|
||
|
|
// container holding it
|
||
|
|
if (conflictingAction.optionStrings.length === 0) {
|
||
|
|
conflictingAction.container._removeAction(conflictingAction);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
};
|