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