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