Current File : //lib/node_modules/pm2/node_modules/argparse/lib/argument_parser.js
/**
* class ArgumentParser
*
* Object for parsing command line strings into js objects.
*
* Inherited from [[ActionContainer]]
**/
'use strict';
var util = require('util');
var format = require('util').format;
var Path = require('path');
var sprintf = require('sprintf-js').sprintf;
// Constants
var c = require('./const');
var $$ = require('./utils');
var ActionContainer = require('./action_container');
// Errors
var argumentErrorHelper = require('./argument/error');
var HelpFormatter = require('./help/formatter');
var Namespace = require('./namespace');
/**
* new ArgumentParser(options)
*
* Create a new ArgumentParser object.
*
* ##### Options:
* - `prog` The name of the program (default: Path.basename(process.argv[1]))
* - `usage` A usage message (default: auto-generated from arguments)
* - `description` A description of what the program does
* - `epilog` Text following the argument descriptions
* - `parents` Parsers whose arguments should be copied into this one
* - `formatterClass` HelpFormatter class for printing help messages
* - `prefixChars` Characters that prefix optional arguments
* - `fromfilePrefixChars` Characters that prefix files containing additional arguments
* - `argumentDefault` The default value for all arguments
* - `addHelp` Add a -h/-help option
* - `conflictHandler` Specifies how to handle conflicting argument names
* - `debug` Enable debug mode. Argument errors throw exception in
* debug mode and process.exit in normal. Used for development and
* testing (default: false)
*
* See also [original guide][1]
*
* [1]:http://docs.python.org/dev/library/argparse.html#argumentparser-objects
**/
function ArgumentParser(options) {
if (!(this instanceof ArgumentParser)) {
return new ArgumentParser(options);
}
var self = this;
options = options || {};
options.description = (options.description || null);
options.argumentDefault = (options.argumentDefault || null);
options.prefixChars = (options.prefixChars || '-');
options.conflictHandler = (options.conflictHandler || 'error');
ActionContainer.call(this, options);
options.addHelp = typeof options.addHelp === 'undefined' || !!options.addHelp;
options.parents = options.parents || [];
// default program name
options.prog = (options.prog || Path.basename(process.argv[1]));
this.prog = options.prog;
this.usage = options.usage;
this.epilog = options.epilog;
this.version = options.version;
this.debug = (options.debug === true);
this.formatterClass = (options.formatterClass || HelpFormatter);
this.fromfilePrefixChars = options.fromfilePrefixChars || null;
this._positionals = this.addArgumentGroup({ title: 'Positional arguments' });
this._optionals = this.addArgumentGroup({ title: 'Optional arguments' });
this._subparsers = null;
// register types
function FUNCTION_IDENTITY(o) {
return o;
}
this.register('type', 'auto', FUNCTION_IDENTITY);
this.register('type', null, FUNCTION_IDENTITY);
this.register('type', 'int', function (x) {
var result = parseInt(x, 10);
if (isNaN(result)) {
throw new Error(x + ' is not a valid integer.');
}
return result;
});
this.register('type', 'float', function (x) {
var result = parseFloat(x);
if (isNaN(result)) {
throw new Error(x + ' is not a valid float.');
}
return result;
});
this.register('type', 'string', function (x) {
return '' + x;
});
// add help and version arguments if necessary
var defaultPrefix = (this.prefixChars.indexOf('-') > -1) ? '-' : this.prefixChars[0];
if (options.addHelp) {
this.addArgument(
[ defaultPrefix + 'h', defaultPrefix + defaultPrefix + 'help' ],
{
action: 'help',
defaultValue: c.SUPPRESS,
help: 'Show this help message and exit.'
}
);
}
if (typeof this.version !== 'undefined') {
this.addArgument(
[ defaultPrefix + 'v', defaultPrefix + defaultPrefix + 'version' ],
{
action: 'version',
version: this.version,
defaultValue: c.SUPPRESS,
help: "Show program's version number and exit."
}
);
}
// add parent arguments and defaults
options.parents.forEach(function (parent) {
self._addContainerActions(parent);
if (typeof parent._defaults !== 'undefined') {
for (var defaultKey in parent._defaults) {
if (parent._defaults.hasOwnProperty(defaultKey)) {
self._defaults[defaultKey] = parent._defaults[defaultKey];
}
}
}
});
}
util.inherits(ArgumentParser, ActionContainer);
/**
* ArgumentParser#addSubparsers(options) -> [[ActionSubparsers]]
* - options (object): hash of options see [[ActionSubparsers.new]]
*
* See also [subcommands][1]
*
* [1]:http://docs.python.org/dev/library/argparse.html#sub-commands
**/
ArgumentParser.prototype.addSubparsers = function (options) {
if (this._subparsers) {
this.error('Cannot have multiple subparser arguments.');
}
options = options || {};
options.debug = (this.debug === true);
options.optionStrings = [];
options.parserClass = (options.parserClass || ArgumentParser);
if (!!options.title || !!options.description) {
this._subparsers = this.addArgumentGroup({
title: (options.title || 'subcommands'),
description: options.description
});
delete options.title;
delete options.description;
} else {
this._subparsers = this._positionals;
}
// prog defaults to the usage message of this parser, skipping
// optional arguments and with no "usage:" prefix
if (!options.prog) {
var formatter = this._getFormatter();
var positionals = this._getPositionalActions();
var groups = this._mutuallyExclusiveGroups;
formatter.addUsage(this.usage, positionals, groups, '');
options.prog = formatter.formatHelp().trim();
}
// create the parsers action and add it to the positionals list
var ParsersClass = this._popActionClass(options, 'parsers');
var action = new ParsersClass(options);
this._subparsers._addAction(action);
// return the created parsers action
return action;
};
ArgumentParser.prototype._addAction = function (action) {
if (action.isOptional()) {
this._optionals._addAction(action);
} else {
this._positionals._addAction(action);
}
return action;
};
ArgumentParser.prototype._getOptionalActions = function () {
return this._actions.filter(function (action) {
return action.isOptional();
});
};
ArgumentParser.prototype._getPositionalActions = function () {
return this._actions.filter(function (action) {
return action.isPositional();
});
};
/**
* ArgumentParser#parseArgs(args, namespace) -> Namespace|Object
* - args (array): input elements
* - namespace (Namespace|Object): result object
*
* Parsed args and throws error if some arguments are not recognized
*
* See also [original guide][1]
*
* [1]:http://docs.python.org/dev/library/argparse.html#the-parse-args-method
**/
ArgumentParser.prototype.parseArgs = function (args, namespace) {
var argv;
var result = this.parseKnownArgs(args, namespace);
args = result[0];
argv = result[1];
if (argv && argv.length > 0) {
this.error(
format('Unrecognized arguments: %s.', argv.join(' '))
);
}
return args;
};
/**
* ArgumentParser#parseKnownArgs(args, namespace) -> array
* - args (array): input options
* - namespace (Namespace|Object): result object
*
* Parse known arguments and return tuple of result object
* and unknown args
*
* See also [original guide][1]
*
* [1]:http://docs.python.org/dev/library/argparse.html#partial-parsing
**/
ArgumentParser.prototype.parseKnownArgs = function (args, namespace) {
var self = this;
// args default to the system args
args = args || process.argv.slice(2);
// default Namespace built from parser defaults
namespace = namespace || new Namespace();
self._actions.forEach(function (action) {
if (action.dest !== c.SUPPRESS) {
if (!$$.has(namespace, action.dest)) {
if (action.defaultValue !== c.SUPPRESS) {
var defaultValue = action.defaultValue;
if (typeof action.defaultValue === 'string') {
defaultValue = self._getValue(action, defaultValue);
}
namespace[action.dest] = defaultValue;
}
}
}
});
Object.keys(self._defaults).forEach(function (dest) {
namespace[dest] = self._defaults[dest];
});
// parse the arguments and exit if there are any errors
try {
var res = this._parseKnownArgs(args, namespace);
namespace = res[0];
args = res[1];
if ($$.has(namespace, c._UNRECOGNIZED_ARGS_ATTR)) {
args = $$.arrayUnion(args, namespace[c._UNRECOGNIZED_ARGS_ATTR]);
delete namespace[c._UNRECOGNIZED_ARGS_ATTR];
}
return [ namespace, args ];
} catch (e) {
this.error(e);
}
};
ArgumentParser.prototype._parseKnownArgs = function (argStrings, namespace) {
var self = this;
var extras = [];
// replace arg strings that are file references
if (this.fromfilePrefixChars !== null) {
argStrings = this._readArgsFromFiles(argStrings);
}
// map all mutually exclusive arguments to the other arguments
// they can't occur with
// Python has 'conflicts = action_conflicts.setdefault(mutex_action, [])'
// though I can't conceive of a way in which an action could be a member
// of two different mutually exclusive groups.
function actionHash(action) {
// some sort of hashable key for this action
// action itself cannot be a key in actionConflicts
// I think getName() (join of optionStrings) is unique enough
return action.getName();
}
var conflicts, key;
var actionConflicts = {};
this._mutuallyExclusiveGroups.forEach(function (mutexGroup) {
mutexGroup._groupActions.forEach(function (mutexAction, i, groupActions) {
key = actionHash(mutexAction);
if (!$$.has(actionConflicts, key)) {
actionConflicts[key] = [];
}
conflicts = actionConflicts[key];
conflicts.push.apply(conflicts, groupActions.slice(0, i));
conflicts.push.apply(conflicts, groupActions.slice(i + 1));
});
});
// find all option indices, and determine the arg_string_pattern
// which has an 'O' if there is an option at an index,
// an 'A' if there is an argument, or a '-' if there is a '--'
var optionStringIndices = {};
var argStringPatternParts = [];
argStrings.forEach(function (argString, argStringIndex) {
if (argString === '--') {
argStringPatternParts.push('-');
while (argStringIndex < argStrings.length) {
argStringPatternParts.push('A');
argStringIndex++;
}
} else {
// otherwise, add the arg to the arg strings
// and note the index if it was an option
var pattern;
var optionTuple = self._parseOptional(argString);
if (!optionTuple) {
pattern = 'A';
} else {
optionStringIndices[argStringIndex] = optionTuple;
pattern = 'O';
}
argStringPatternParts.push(pattern);
}
});
var argStringsPattern = argStringPatternParts.join('');
var seenActions = [];
var seenNonDefaultActions = [];
function takeAction(action, argumentStrings, optionString) {
seenActions.push(action);
var argumentValues = self._getValues(action, argumentStrings);
// error if this argument is not allowed with other previously
// seen arguments, assuming that actions that use the default
// value don't really count as "present"
if (argumentValues !== action.defaultValue) {
seenNonDefaultActions.push(action);
if (actionConflicts[actionHash(action)]) {
actionConflicts[actionHash(action)].forEach(function (actionConflict) {
if (seenNonDefaultActions.indexOf(actionConflict) >= 0) {
throw argumentErrorHelper(
action,
format('Not allowed with argument "%s".', actionConflict.getName())
);
}
});
}
}
if (argumentValues !== c.SUPPRESS) {
action.call(self, namespace, argumentValues, optionString);
}
}
function consumeOptional(startIndex) {
// get the optional identified at this index
var optionTuple = optionStringIndices[startIndex];
var action = optionTuple[0];
var optionString = optionTuple[1];
var explicitArg = optionTuple[2];
// identify additional optionals in the same arg string
// (e.g. -xyz is the same as -x -y -z if no args are required)
var actionTuples = [];
var args, argCount, start, stop;
for (;;) {
if (!action) {
extras.push(argStrings[startIndex]);
return startIndex + 1;
}
if (explicitArg) {
argCount = self._matchArgument(action, 'A');
// if the action is a single-dash option and takes no
// arguments, try to parse more single-dash options out
// of the tail of the option string
var chars = self.prefixChars;
if (argCount === 0 && chars.indexOf(optionString[1]) < 0) {
actionTuples.push([ action, [], optionString ]);
optionString = optionString[0] + explicitArg[0];
var newExplicitArg = explicitArg.slice(1) || null;
var optionalsMap = self._optionStringActions;
if (Object.keys(optionalsMap).indexOf(optionString) >= 0) {
action = optionalsMap[optionString];
explicitArg = newExplicitArg;
} else {
throw argumentErrorHelper(action, sprintf('ignored explicit argument %r', explicitArg));
}
} else if (argCount === 1) {
// if the action expect exactly one argument, we've
// successfully matched the option; exit the loop
stop = startIndex + 1;
args = [ explicitArg ];
actionTuples.push([ action, args, optionString ]);
break;
} else {
// error if a double-dash option did not use the
// explicit argument
throw argumentErrorHelper(action, sprintf('ignored explicit argument %r', explicitArg));
}
} else {
// if there is no explicit argument, try to match the
// optional's string arguments with the following strings
// if successful, exit the loop
start = startIndex + 1;
var selectedPatterns = argStringsPattern.substr(start);
argCount = self._matchArgument(action, selectedPatterns);
stop = start + argCount;
args = argStrings.slice(start, stop);
actionTuples.push([ action, args, optionString ]);
break;
}
}
// add the Optional to the list and return the index at which
// the Optional's string args stopped
if (actionTuples.length < 1) {
throw new Error('length should be > 0');
}
for (var i = 0; i < actionTuples.length; i++) {
takeAction.apply(self, actionTuples[i]);
}
return stop;
}
// the list of Positionals left to be parsed; this is modified
// by consume_positionals()
var positionals = self._getPositionalActions();
function consumePositionals(startIndex) {
// match as many Positionals as possible
var selectedPattern = argStringsPattern.substr(startIndex);
var argCounts = self._matchArgumentsPartial(positionals, selectedPattern);
// slice off the appropriate arg strings for each Positional
// and add the Positional and its args to the list
for (var i = 0; i < positionals.length; i++) {
var action = positionals[i];
var argCount = argCounts[i];
if (typeof argCount === 'undefined') {
continue;
}
var args = argStrings.slice(startIndex, startIndex + argCount);
startIndex += argCount;
takeAction(action, args);
}
// slice off the Positionals that we just parsed and return the
// index at which the Positionals' string args stopped
positionals = positionals.slice(argCounts.length);
return startIndex;
}
// consume Positionals and Optionals alternately, until we have
// passed the last option string
var startIndex = 0;
var position;
var maxOptionStringIndex = -1;
Object.keys(optionStringIndices).forEach(function (position) {
maxOptionStringIndex = Math.max(maxOptionStringIndex, parseInt(position, 10));
});
var positionalsEndIndex, nextOptionStringIndex;
while (startIndex <= maxOptionStringIndex) {
// consume any Positionals preceding the next option
nextOptionStringIndex = null;
for (position in optionStringIndices) {
if (!optionStringIndices.hasOwnProperty(position)) { continue; }
position = parseInt(position, 10);
if (position >= startIndex) {
if (nextOptionStringIndex !== null) {
nextOptionStringIndex = Math.min(nextOptionStringIndex, position);
} else {
nextOptionStringIndex = position;
}
}
}
if (startIndex !== nextOptionStringIndex) {
positionalsEndIndex = consumePositionals(startIndex);
// only try to parse the next optional if we didn't consume
// the option string during the positionals parsing
if (positionalsEndIndex > startIndex) {
startIndex = positionalsEndIndex;
continue;
} else {
startIndex = positionalsEndIndex;
}
}
// if we consumed all the positionals we could and we're not
// at the index of an option string, there were extra arguments
if (!optionStringIndices[startIndex]) {
var strings = argStrings.slice(startIndex, nextOptionStringIndex);
extras = extras.concat(strings);
startIndex = nextOptionStringIndex;
}
// consume the next optional and any arguments for it
startIndex = consumeOptional(startIndex);
}
// consume any positionals following the last Optional
var stopIndex = consumePositionals(startIndex);
// if we didn't consume all the argument strings, there were extras
extras = extras.concat(argStrings.slice(stopIndex));
// if we didn't use all the Positional objects, there were too few
// arg strings supplied.
if (positionals.length > 0) {
self.error('too few arguments');
}
// make sure all required actions were present
self._actions.forEach(function (action) {
if (action.required) {
if (seenActions.indexOf(action) < 0) {
self.error(format('Argument "%s" is required', action.getName()));
}
}
});
// make sure all required groups have one option present
var actionUsed = false;
self._mutuallyExclusiveGroups.forEach(function (group) {
if (group.required) {
actionUsed = group._groupActions.some(function (action) {
return seenNonDefaultActions.indexOf(action) !== -1;
});
// if no actions were used, report the error
if (!actionUsed) {
var names = [];
group._groupActions.forEach(function (action) {
if (action.help !== c.SUPPRESS) {
names.push(action.getName());
}
});
names = names.join(' ');
var msg = 'one of the arguments ' + names + ' is required';
self.error(msg);
}
}
});
// return the updated namespace and the extra arguments
return [ namespace, extras ];
};
ArgumentParser.prototype._readArgsFromFiles = function (argStrings) {
// expand arguments referencing files
var self = this;
var fs = require('fs');
var newArgStrings = [];
argStrings.forEach(function (argString) {
if (self.fromfilePrefixChars.indexOf(argString[0]) < 0) {
// for regular arguments, just add them back into the list
newArgStrings.push(argString);
} else {
// replace arguments referencing files with the file content
try {
var argstrs = [];
var filename = argString.slice(1);
var content = fs.readFileSync(filename, 'utf8');
content = content.trim().split('\n');
content.forEach(function (argLine) {
self.convertArgLineToArgs(argLine).forEach(function (arg) {
argstrs.push(arg);
});
argstrs = self._readArgsFromFiles(argstrs);
});
newArgStrings.push.apply(newArgStrings, argstrs);
} catch (error) {
return self.error(error.message);
}
}
});
return newArgStrings;
};
ArgumentParser.prototype.convertArgLineToArgs = function (argLine) {
return [ argLine ];
};
ArgumentParser.prototype._matchArgument = function (action, regexpArgStrings) {
// match the pattern for this action to the arg strings
var regexpNargs = new RegExp('^' + this._getNargsPattern(action));
var matches = regexpArgStrings.match(regexpNargs);
var message;
// throw an exception if we weren't able to find a match
if (!matches) {
switch (action.nargs) {
/*eslint-disable no-undefined*/
case undefined:
case null:
message = 'Expected one argument.';
break;
case c.OPTIONAL:
message = 'Expected at most one argument.';
break;
case c.ONE_OR_MORE:
message = 'Expected at least one argument.';
break;
default:
message = 'Expected %s argument(s)';
}
throw argumentErrorHelper(
action,
format(message, action.nargs)
);
}
// return the number of arguments matched
return matches[1].length;
};
ArgumentParser.prototype._matchArgumentsPartial = function (actions, regexpArgStrings) {
// progressively shorten the actions list by slicing off the
// final actions until we find a match
var self = this;
var result = [];
var actionSlice, pattern, matches;
var i, j;
function getLength(string) {
return string.length;
}
for (i = actions.length; i > 0; i--) {
pattern = '';
actionSlice = actions.slice(0, i);
for (j = 0; j < actionSlice.length; j++) {
pattern += self._getNargsPattern(actionSlice[j]);
}
pattern = new RegExp('^' + pattern);
matches = regexpArgStrings.match(pattern);
if (matches && matches.length > 0) {
// need only groups
matches = matches.splice(1);
result = result.concat(matches.map(getLength));
break;
}
}
// return the list of arg string counts
return result;
};
ArgumentParser.prototype._parseOptional = function (argString) {
var action, optionString, argExplicit, optionTuples;
// if it's an empty string, it was meant to be a positional
if (!argString) {
return null;
}
// if it doesn't start with a prefix, it was meant to be positional
if (this.prefixChars.indexOf(argString[0]) < 0) {
return null;
}
// if the option string is present in the parser, return the action
if (this._optionStringActions[argString]) {
return [ this._optionStringActions[argString], argString, null ];
}
// if it's just a single character, it was meant to be positional
if (argString.length === 1) {
return null;
}
// if the option string before the "=" is present, return the action
if (argString.indexOf('=') >= 0) {
optionString = argString.split('=', 1)[0];
argExplicit = argString.slice(optionString.length + 1);
if (this._optionStringActions[optionString]) {
action = this._optionStringActions[optionString];
return [ action, optionString, argExplicit ];
}
}
// search through all possible prefixes of the option string
// and all actions in the parser for possible interpretations
optionTuples = this._getOptionTuples(argString);
// if multiple actions match, the option string was ambiguous
if (optionTuples.length > 1) {
var optionStrings = optionTuples.map(function (optionTuple) {
return optionTuple[1];
});
this.error(format(
'Ambiguous option: "%s" could match %s.',
argString, optionStrings.join(', ')
));
// if exactly one action matched, this segmentation is good,
// so return the parsed action
} else if (optionTuples.length === 1) {
return optionTuples[0];
}
// if it was not found as an option, but it looks like a negative
// number, it was meant to be positional
// unless there are negative-number-like options
if (argString.match(this._regexpNegativeNumber)) {
if (!this._hasNegativeNumberOptionals.some(Boolean)) {
return null;
}
}
// if it contains a space, it was meant to be a positional
if (argString.search(' ') >= 0) {
return null;
}
// it was meant to be an optional but there is no such option
// in this parser (though it might be a valid option in a subparser)
return [ null, argString, null ];
};
ArgumentParser.prototype._getOptionTuples = function (optionString) {
var result = [];
var chars = this.prefixChars;
var optionPrefix;
var argExplicit;
var action;
var actionOptionString;
// option strings starting with two prefix characters are only split at
// the '='
if (chars.indexOf(optionString[0]) >= 0 && chars.indexOf(optionString[1]) >= 0) {
if (optionString.indexOf('=') >= 0) {
var optionStringSplit = optionString.split('=', 1);
optionPrefix = optionStringSplit[0];
argExplicit = optionStringSplit[1];
} else {
optionPrefix = optionString;
argExplicit = null;
}
for (actionOptionString in this._optionStringActions) {
if (actionOptionString.substr(0, optionPrefix.length) === optionPrefix) {
action = this._optionStringActions[actionOptionString];
result.push([ action, actionOptionString, argExplicit ]);
}
}
// single character options can be concatenated with their arguments
// but multiple character options always have to have their argument
// separate
} else if (chars.indexOf(optionString[0]) >= 0 && chars.indexOf(optionString[1]) < 0) {
optionPrefix = optionString;
argExplicit = null;
var optionPrefixShort = optionString.substr(0, 2);
var argExplicitShort = optionString.substr(2);
for (actionOptionString in this._optionStringActions) {
if (!$$.has(this._optionStringActions, actionOptionString)) continue;
action = this._optionStringActions[actionOptionString];
if (actionOptionString === optionPrefixShort) {
result.push([ action, actionOptionString, argExplicitShort ]);
} else if (actionOptionString.substr(0, optionPrefix.length) === optionPrefix) {
result.push([ action, actionOptionString, argExplicit ]);
}
}
// shouldn't ever get here
} else {
throw new Error(format('Unexpected option string: %s.', optionString));
}
// return the collected option tuples
return result;
};
ArgumentParser.prototype._getNargsPattern = function (action) {
// in all examples below, we have to allow for '--' args
// which are represented as '-' in the pattern
var regexpNargs;
switch (action.nargs) {
// the default (null) is assumed to be a single argument
case undefined:
case null:
regexpNargs = '(-*A-*)';
break;
// allow zero or more arguments
case c.OPTIONAL:
regexpNargs = '(-*A?-*)';
break;
// allow zero or more arguments
case c.ZERO_OR_MORE:
regexpNargs = '(-*[A-]*)';
break;
// allow one or more arguments
case c.ONE_OR_MORE:
regexpNargs = '(-*A[A-]*)';
break;
// allow any number of options or arguments
case c.REMAINDER:
regexpNargs = '([-AO]*)';
break;
// allow one argument followed by any number of options or arguments
case c.PARSER:
regexpNargs = '(-*A[-AO]*)';
break;
// all others should be integers
default:
regexpNargs = '(-*' + $$.repeat('-*A', action.nargs) + '-*)';
}
// if this is an optional action, -- is not allowed
if (action.isOptional()) {
regexpNargs = regexpNargs.replace(/-\*/g, '');
regexpNargs = regexpNargs.replace(/-/g, '');
}
// return the pattern
return regexpNargs;
};
//
// Value conversion methods
//
ArgumentParser.prototype._getValues = function (action, argStrings) {
var self = this;
// for everything but PARSER args, strip out '--'
if (action.nargs !== c.PARSER && action.nargs !== c.REMAINDER) {
argStrings = argStrings.filter(function (arrayElement) {
return arrayElement !== '--';
});
}
var value, argString;
// optional argument produces a default when not present
if (argStrings.length === 0 && action.nargs === c.OPTIONAL) {
value = (action.isOptional()) ? action.constant : action.defaultValue;
if (typeof (value) === 'string') {
value = this._getValue(action, value);
this._checkValue(action, value);
}
// when nargs='*' on a positional, if there were no command-line
// args, use the default if it is anything other than None
} else if (argStrings.length === 0 && action.nargs === c.ZERO_OR_MORE &&
action.optionStrings.length === 0) {
value = (action.defaultValue || argStrings);
this._checkValue(action, value);
// single argument or optional argument produces a single value
} else if (argStrings.length === 1 &&
(!action.nargs || action.nargs === c.OPTIONAL)) {
argString = argStrings[0];
value = this._getValue(action, argString);
this._checkValue(action, value);
// REMAINDER arguments convert all values, checking none
} else if (action.nargs === c.REMAINDER) {
value = argStrings.map(function (v) {
return self._getValue(action, v);
});
// PARSER arguments convert all values, but check only the first
} else if (action.nargs === c.PARSER) {
value = argStrings.map(function (v) {
return self._getValue(action, v);
});
this._checkValue(action, value[0]);
// all other types of nargs produce a list
} else {
value = argStrings.map(function (v) {
return self._getValue(action, v);
});
value.forEach(function (v) {
self._checkValue(action, v);
});
}
// return the converted value
return value;
};
ArgumentParser.prototype._getValue = function (action, argString) {
var result;
var typeFunction = this._registryGet('type', action.type, action.type);
if (typeof typeFunction !== 'function') {
var message = format('%s is not callable', typeFunction);
throw argumentErrorHelper(action, message);
}
// convert the value to the appropriate type
try {
result = typeFunction(argString);
// ArgumentTypeErrors indicate errors
// If action.type is not a registered string, it is a function
// Try to deduce its name for inclusion in the error message
// Failing that, include the error message it raised.
} catch (e) {
var name = null;
if (typeof action.type === 'string') {
name = action.type;
} else {
name = action.type.name || action.type.displayName || '<function>';
}
var msg = format('Invalid %s value: %s', name, argString);
if (name === '<function>') { msg += '\n' + e.message; }
throw argumentErrorHelper(action, msg);
}
// return the converted value
return result;
};
ArgumentParser.prototype._checkValue = function (action, value) {
// converted value must be one of the choices (if specified)
var choices = action.choices;
if (choices) {
// choise for argument can by array or string
if ((typeof choices === 'string' || Array.isArray(choices)) &&
choices.indexOf(value) !== -1) {
return;
}
// choise for subparsers can by only hash
if (typeof choices === 'object' && !Array.isArray(choices) && choices[value]) {
return;
}
if (typeof choices === 'string') {
choices = choices.split('').join(', ');
} else if (Array.isArray(choices)) {
choices = choices.join(', ');
} else {
choices = Object.keys(choices).join(', ');
}
var message = format('Invalid choice: %s (choose from [%s])', value, choices);
throw argumentErrorHelper(action, message);
}
};
//
// Help formatting methods
//
/**
* ArgumentParser#formatUsage -> string
*
* Return usage string
*
* See also [original guide][1]
*
* [1]:http://docs.python.org/dev/library/argparse.html#printing-help
**/
ArgumentParser.prototype.formatUsage = function () {
var formatter = this._getFormatter();
formatter.addUsage(this.usage, this._actions, this._mutuallyExclusiveGroups);
return formatter.formatHelp();
};
/**
* ArgumentParser#formatHelp -> string
*
* Return help
*
* See also [original guide][1]
*
* [1]:http://docs.python.org/dev/library/argparse.html#printing-help
**/
ArgumentParser.prototype.formatHelp = function () {
var formatter = this._getFormatter();
// usage
formatter.addUsage(this.usage, this._actions, this._mutuallyExclusiveGroups);
// description
formatter.addText(this.description);
// positionals, optionals and user-defined groups
this._actionGroups.forEach(function (actionGroup) {
formatter.startSection(actionGroup.title);
formatter.addText(actionGroup.description);
formatter.addArguments(actionGroup._groupActions);
formatter.endSection();
});
// epilog
formatter.addText(this.epilog);
// determine help from format above
return formatter.formatHelp();
};
ArgumentParser.prototype._getFormatter = function () {
var FormatterClass = this.formatterClass;
var formatter = new FormatterClass({ prog: this.prog });
return formatter;
};
//
// Print functions
//
/**
* ArgumentParser#printUsage() -> Void
*
* Print usage
*
* See also [original guide][1]
*
* [1]:http://docs.python.org/dev/library/argparse.html#printing-help
**/
ArgumentParser.prototype.printUsage = function () {
this._printMessage(this.formatUsage());
};
/**
* ArgumentParser#printHelp() -> Void
*
* Print help
*
* See also [original guide][1]
*
* [1]:http://docs.python.org/dev/library/argparse.html#printing-help
**/
ArgumentParser.prototype.printHelp = function () {
this._printMessage(this.formatHelp());
};
ArgumentParser.prototype._printMessage = function (message, stream) {
if (!stream) {
stream = process.stdout;
}
if (message) {
stream.write('' + message);
}
};
//
// Exit functions
//
/**
* ArgumentParser#exit(status=0, message) -> Void
* - status (int): exit status
* - message (string): message
*
* Print message in stderr/stdout and exit program
**/
ArgumentParser.prototype.exit = function (status, message) {
if (message) {
if (status === 0) {
this._printMessage(message);
} else {
this._printMessage(message, process.stderr);
}
}
process.exit(status);
};
/**
* ArgumentParser#error(message) -> Void
* - err (Error|string): message
*
* Error method Prints a usage message incorporating the message to stderr and
* exits. If you override this in a subclass,
* it should not return -- it should
* either exit or throw an exception.
*
**/
ArgumentParser.prototype.error = function (err) {
var message;
if (err instanceof Error) {
if (this.debug === true) {
throw err;
}
message = err.message;
} else {
message = err;
}
var msg = format('%s: error: %s', this.prog, message) + c.EOL;
if (this.debug === true) {
throw new Error(msg);
}
this.printUsage(process.stderr);
return this.exit(2, msg);
};
module.exports = ArgumentParser;
Mini Shell