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/**
* class Action
*
* Base class for all actions
* Do not call in your code, use this class only for inherits your own action
*
* Information about how to convert command line strings to Javascript objects.
* Action objects are used by an ArgumentParser to represent the information
* needed to parse a single argument from one or more strings from the command
* line. The keyword arguments to the Action constructor are also all attributes
* of Action instances.
*
* ##### Allowed keywords:
*
* - `store`
* - `storeConstant`
* - `storeTrue`
* - `storeFalse`
* - `append`
* - `appendConstant`
* - `count`
* - `help`
* - `version`
*
* Information about action options see [[Action.new]]
*
* See also [original guide](http://docs.python.org/dev/library/argparse.html#action)
*
**/
'use strict';
// Constants
var c = require('./const');
/**
* new Action(options)
*
* Base class for all actions. Used only for inherits
*
*
* ##### Options:
*
* - `optionStrings` A list of command-line option strings for the action.
* - `dest` Attribute to hold the created object(s)
* - `nargs` The number of command-line arguments that should be consumed.
* By default, one argument will be consumed and a single value will be
* produced.
* - `constant` Default value for an action with no value.
* - `defaultValue` The value to be produced if the option is not specified.
* - `type` Cast to 'string'|'int'|'float'|'complex'|function (string). If
* None, 'string'.
* - `choices` The choices available.
* - `required` True if the action must always be specified at the command
* line.
* - `help` The help describing the argument.
* - `metavar` The name to be used for the option's argument with the help
* string. If None, the 'dest' value will be used as the name.
*
* ##### nargs supported values:
*
* - `N` (an integer) consumes N arguments (and produces a list)
* - `?` consumes zero or one arguments
* - `*` consumes zero or more arguments (and produces a list)
* - `+` consumes one or more arguments (and produces a list)
*
* Note: that the difference between the default and nargs=1 is that with the
* default, a single value will be produced, while with nargs=1, a list
* containing a single value will be produced.
**/
var Action = module.exports = function Action(options) {
options = options || {};
this.optionStrings = options.optionStrings || [];
this.dest = options.dest;
this.nargs = typeof options.nargs !== 'undefined' ? options.nargs : null;
this.constant = typeof options.constant !== 'undefined' ? options.constant : null;
this.defaultValue = options.defaultValue;
this.type = typeof options.type !== 'undefined' ? options.type : null;
this.choices = typeof options.choices !== 'undefined' ? options.choices : null;
this.required = typeof options.required !== 'undefined' ? options.required : false;
this.help = typeof options.help !== 'undefined' ? options.help : null;
this.metavar = typeof options.metavar !== 'undefined' ? options.metavar : null;
if (!(this.optionStrings instanceof Array)) {
throw new Error('optionStrings should be an array');
}
if (typeof this.required !== 'undefined' && typeof this.required !== 'boolean') {
throw new Error('required should be a boolean');
}
};
/**
* Action#getName -> String
*
* Tells action name
**/
Action.prototype.getName = function () {
if (this.optionStrings.length > 0) {
return this.optionStrings.join('/');
} else if (this.metavar !== null && this.metavar !== c.SUPPRESS) {
return this.metavar;
} else if (typeof this.dest !== 'undefined' && this.dest !== c.SUPPRESS) {
return this.dest;
}
return null;
};
/**
* Action#isOptional -> Boolean
*
* Return true if optional
**/
Action.prototype.isOptional = function () {
return !this.isPositional();
};
/**
* Action#isPositional -> Boolean
*
* Return true if positional
**/
Action.prototype.isPositional = function () {
return (this.optionStrings.length === 0);
};
/**
* Action#call(parser, namespace, values, optionString) -> Void
* - parser (ArgumentParser): current parser
* - namespace (Namespace): namespace for output data
* - values (Array): parsed values
* - optionString (Array): input option string(not parsed)
*
* Call the action. Should be implemented in inherited classes
*
* ##### Example
*
* ActionCount.prototype.call = function (parser, namespace, values, optionString) {
* namespace.set(this.dest, (namespace[this.dest] || 0) + 1);
* };
*
**/
Action.prototype.call = function () {
throw new Error('.call() not defined');// Not Implemented error
};