//
// Options.cs
//
// Authors:
// Jonathan Pryor <jpryor@novell.com>
//
// Copyright (C) 2008 Novell (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// Compile With:
// gmcs -debug+ -r:System.Core Options.cs -o:NDesk.Options.dll
// gmcs -debug+ -d:LINQ -r:System.Core Options.cs -o:NDesk.Options.dll
//
// The LINQ version just changes the implementation of
// OptionSet.Parse(IEnumerable<string>), and confers no semantic changes.
//
// A Getopt::Long-inspired option parsing library for C#.
//
// NDesk.Options.OptionSet is built upon a key/value table, where the
// key is a option format string and the value is a delegate that is
// invoked when the format string is matched.
//
// Option format strings:
// Regex-like BNF Grammar:
// name: .+
// type: [=:]
// sep: ( [^{}]+ | '{' .+ '}' )?
// aliases: ( name type sep ) ( '|' name type sep )*
//
// Each '|'-delimited name is an alias for the associated action. If the
// format string ends in a '=', it has a required value. If the format
// string ends in a ':', it has an optional value. If neither '=' or ':'
// is present, no value is supported. `=' or `:' need only be defined on one
// alias, but if they are provided on more than one they must be consistent.
//
// Each alias portion may also end with a "key/value separator", which is used
// to split option values if the option accepts > 1 value. If not specified,
// it defaults to '=' and ':'. If specified, it can be any character except
// '{' and '}' OR the *string* between '{' and '}'. If no separator should be
// used (i.e. the separate values should be distinct arguments), then "{}"
// should be used as the separator.
//
// Options are extracted either from the current option by looking for
// the option name followed by an '=' or ':', or is taken from the
// following option IFF:
// - The current option does not contain a '=' or a ':'
// - The current option requires a value (i.e. not a Option type of ':')
//
// The `name' used in the option format string does NOT include any leading
// option indicator, such as '-', '--', or '/'. All three of these are
// permitted/required on any named option.
//
// Option bundling is permitted so long as:
// - '-' is used to start the option group
// - all of the bundled options are a single character
// - at most one of the bundled options accepts a value, and the value
// provided starts from the next character to the end of the string.
//
// This allows specifying '-a -b -c' as '-abc', and specifying '-D name=value'
// as '-Dname=value'.
//
// Option processing is disabled by specifying "--". All options after "--"
// are returned by OptionSet.Parse() unchanged and unprocessed.
//
// Unprocessed options are returned from OptionSet.Parse().
//
// Examples:
// int verbose = 0;
// OptionSet p = new OptionSet ()
// .Add ("v", v => ++verbose)
// .Add ("name=|value=", v => Console.WriteLine (v));
// p.Parse (new string[]{"-v", "--v", "/v", "-name=A", "/name", "B", "extra"});
//
// The above would parse the argument string array, and would invoke the
// lambda expression three times, setting `verbose' to 3 when complete.
// It would also print out "A" and "B" to standard output.
// The returned array would contain the string "extra".
//
// C# 3.0 collection initializers are supported and encouraged:
// var p = new OptionSet () {
// { "h|?|help", v => ShowHelp () },
// };
//
// System.ComponentModel.TypeConverter is also supported, allowing the use of
// custom data types in the callback type; TypeConverter.ConvertFromString()
// is used to convert the value option to an instance of the specified
// type:
//
// var p = new OptionSet () {
// { "foo=", (Foo f) => Console.WriteLine (f.ToString ()) },
// };
//
// Random other tidbits:
// - Boolean options (those w/o '=' or ':' in the option format string)
// are explicitly enabled if they are followed with '+', and explicitly
// disabled if they are followed with '-':
// string a = null;
// var p = new OptionSet () {
// { "a", s => a = s },
// };
// p.Parse (new string[]{"-a"}); // sets v != null
// p.Parse (new string[]{"-a+"}); // sets v != null
// p.Parse (new string[]{"-a-"}); // sets v == null
//
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Globalization;
using System.IO;
using System.Runtime.Serialization;
using System.Security.Permissions;
using System.Text;
using System.Text.RegularExpressions;
using System.Linq;
namespace Console{
public class OptionValueCollection : IList, IList<string> {
List<string> values = new List<string> ();
OptionContext c;
internal OptionValueCollection (OptionContext c)
{
this.c = c;
}
#region ICollection
void ICollection.CopyTo (Array array, int index) {(values as ICollection).CopyTo (array, index);}
bool ICollection.IsSynchronized {get {return (values as ICollection).IsSynchronized;}}
object ICollection.SyncRoot {get {return (values as ICollection).SyncRoot;}}
#endregion
#region ICollection<T>
public void Add (string item) {values.Add (item);}
public void Clear () {values.Clear ();}
public bool Contains (string item) {return values.Contains (item);}
public void CopyTo (string[] array, int arrayIndex) {values.CopyTo (array, arrayIndex);}
public bool Remove (string item) {return values.Remove (item);}
public int Count {get {return values.Count;}}
public bool IsReadOnly {get {return false;}}
#endregion
#region IEnumerable
IEnumerator IEnumerable.GetEnumerator () {return values.GetEnumerator ();}
#endregion
#region IEnumerable<T>
public IEnumerator<string> GetEnumerator () {return values.GetEnumerator ();}
#endregion
#region IList
int IList.Add (object value) {return (values as IList).Add (value);}
bool IList.Contains (object value) {return (values as IList).Contains (value);}
int IList.IndexOf (object value) {return (values as IList).IndexOf (value);}
void IList.Insert (int index, object value) {(values as IList).Insert (index, value);}
void IList.Remove (object value) {(values as IList).Remove (value);}
void IList.RemoveAt (int index) {(values as IList).RemoveAt (index);}
bool IList.IsFixedSize {get {return false;}}
object IList.this [int index] {get {return this [index];} set {(values as IList)[index] = value;}}
#endregion
#region IList<T>
public int IndexOf (string item) {return values.IndexOf (item);}
public void Insert (int index, string item) {values.Insert (index, item);}
public void RemoveAt (int index) {values.RemoveAt (index);}
private void AssertValid (int index)
{
if (c.Option == null)
throw new InvalidOperationException ("OptionContext.Option is null.");
if (index >= c.Option.MaxValueCount)
throw new ArgumentOutOfRangeException ("index");
if (c.Option.OptionValueType == OptionValueType.Required &&
index >= values.Count)
throw new OptionException (string.Format (
c.OptionSet.MessageLocalizer ("Missing required value for option '{0}'."), c.OptionName),
c.OptionName);
}
public string this [int index] {
get {
AssertValid (index);
return index >= values.Count ? null : values [index];
}
set {
values [index] = value;
}
}
#endregion
public List<string> ToList ()
{
return new List<string> (values);
}
public string[] ToArray ()
{
return values.ToArray ();
}
public override string ToString ()
{
return string.Join (", ", values.ToArray ());
}
}
public class OptionContext {
private Option option;
private string name;
private int index;
private OptionSet set;
private OptionValueCollection c;
public OptionContext (OptionSet set)
{
this.set = set;
this.c = new OptionValueCollection (this);
}
public Option Option {
get {return option;}
set {option = value;}
}
public string OptionName {
get {return name;}
set {name = value;}
}
public int OptionIndex {
get {return index;}
set {index = value;}
}
public OptionSet OptionSet {
get {return set;}
}
public OptionValueCollection OptionValues {
get {return c;}
}
}
public enum OptionValueType {
None,
Optional,
Required,
}
public abstract class Option {
string prototype, description;
string[] names;
OptionValueType type;
int count;
string[] separators;
protected Option (string prototype, string description)
: this (prototype, description, 1)
{
}
protected Option (string prototype, string description, int maxValueCount)
{
if (prototype == null)
throw new ArgumentNullException ("prototype");
if (prototype.Length == 0)
throw new ArgumentException ("Cannot be the empty string.", "prototype");
if (maxValueCount < 0)
throw new ArgumentOutOfRangeException ("maxValueCount");
this.prototype = prototype;
this.names = prototype.Split ('|');
this.description = description;
this.count = maxValueCount;
this.type = ParsePrototype ();
if (this.count == 0 && type != OptionValueType.None)
throw new ArgumentException (
"Cannot provide maxValueCount of 0 for OptionValueType.Required or " +
"OptionValueType.Optional.",
"maxValueCount");
if (this.type == OptionValueType.None && maxValueCount > 1)
throw new ArgumentException (
string.Format ("Cannot provide maxValueCount of {0} for OptionValueType.None.", maxValueCount),
"maxValueCount");
if (Array.IndexOf (names, "<>") >= 0 &&
((names.Length == 1 && this.type != OptionValueType.None) ||
(names.Length > 1 && this.MaxValueCount > 1)))
throw new ArgumentException (
"The default option handler '<>' cannot require values.",
"prototype");
}
public string Prototype {get {return prototype;}}
public string Description {get {return description;}}
public OptionValueType OptionValueType {get {return type;}}
public int MaxValueCount {get {return count;}}
public string[] GetNames ()
{
return (string[]) names.Clone ();
}
public string[] GetValueSeparators ()
{
if (separators == null)
return new string [0];
return (string[]) separators.Clone ();
}
protected static T Parse<T> (string value, OptionContext c)
{
Type tt = typeof (T);
bool nullable = tt.IsValueType && tt.IsGenericType &&
!tt.IsGenericTypeDefinition &&
tt.GetGenericTypeDefinition () == typeof (Nullable<>);
Type targetType = nullable ? tt.GetGenericArguments () [0] : typeof (T);
TypeConverter conv = TypeDescriptor.GetConverter (targetType);
T t = default (T);
try {
if (value != null)
t = (T) conv.ConvertFromString (value);
}
catch (Exception e) {
throw new OptionException (
string.Format (
c.OptionSet.MessageLocalizer ("Could not convert string `{0}' to type {1} for option `{2}'."),
value, targetType.Name, c.OptionName),
c.OptionName, e);
}
return t;
}
internal string[] Names {get {return names;}}
internal string[] ValueSeparators {get {return separators;}}
static readonly char[] NameTerminator = new char[]{'=', ':'};
private OptionValueType ParsePrototype ()
{
char type = '\0';
List<string> seps = new List<string> ();
for (int i = 0; i < names.Length; ++i) {
string name = names [i];
if (name.Length == 0)
throw new ArgumentException ("Empty option names are not supported.", "prototype");
int end = name.IndexOfAny (NameTerminator);
if (end == -1)
continue;
names [i] = name.Substring (0, end);
if (type == '\0' || type == name [end])
type = name [end];
else
throw new ArgumentException (
string.Format ("Conflicting option types: '{0}' vs. '{1}'.", type, name [end]),
"prototype");
AddSeparators (name, end, seps);
}
if (type == '\0')
return OptionValueType.None;
if (count <= 1 && seps.Count != 0)
throw new ArgumentException (
string.Format ("Cannot provide key/value separators for Options taking {0} value(s).", count),
"prototype");
if (count > 1) {
if (seps.Count == 0)
this.separators = new string[]{":", "="};
else if (seps.Count == 1 && seps [0].Length == 0)
this.separators = null;
else
this.separators = seps.ToArray ();
}
return type == '=' ? OptionValueType.Required : OptionValueType.Optional;
}
private static void AddSeparators (string name, int end, ICollection<string> seps)
{
int start = -1;
for (int i = end+1; i < name.Length; ++i) {
switch (name [i]) {
case '{':
if (start != -1)
throw new ArgumentException (
string.Format ("Ill-formed name/value separator found in \"{0}\".", name),
"prototype");
start = i+1;
break;
case '}':
if (start == -1)
throw new ArgumentException (
string.Format ("Ill-formed name/value separator found in \"{0}\".", name),
"prototype");
seps.Add (name.Substring (start, i-start));
start = -1;
break;
default:
if (start == -1)
seps.Add (name [i].ToString ());
break;
}
}
if (start != -1)
throw new ArgumentException (
string.Format ("Ill-formed name/value separator found in \"{0}\".", name),
"prototype");
}
public void Invoke (OptionContext c)
{
OnParseComplete (c);
c.OptionName = null;
c.Option = null;
c.OptionValues.Clear ();
}
protected abstract void OnParseComplete (OptionContext c);
public override string ToString ()
{
return Prototype;
}
}
[Serializable]
public class OptionException : Exception {
private string option;
public OptionException ()
{
}
public OptionException (string message, string optionName)
: base (message)
{
this.option = optionName;
}
public OptionException (string message, string optionName, Exception innerException)
: base (message, innerException)
{
this.option = optionName;
}
protected OptionException (SerializationInfo info, StreamingContext context)
: base (info, context)
{
this.option = info.GetString ("OptionName");
}
public string OptionName {
get {return this.option;}
}
[SecurityPermission (SecurityAction.LinkDemand, SerializationFormatter = true)]
public override void GetObjectData (SerializationInfo info, StreamingContext context)
{
base.GetObjectData (info, context);
info.AddValue ("OptionName", option);
}
}
public delegate void OptionAction<TKey, TValue> (TKey key, TValue value);
public class OptionSet : KeyedCollection<string, Option>
{
public OptionSet ()
: this (delegate (string f) {return f;})
{
}
public OptionSet (Converter<string, string> localizer)
{
this.localizer = localizer;
}
Converter<string, string> localizer;
public Converter<string, string> MessageLocalizer {
get {return localizer;}
}
protected override string GetKeyForItem (Option item)
{
if (item == null)
throw new ArgumentNullException ("option");
if (item.Names != null && item.Names.Length > 0)
return item.Names [0];
// This should never happen, as it's invalid for Option to be
// constructed w/o any names.
throw new InvalidOperationException ("Option has no names!");
}
[Obsolete ("Use KeyedCollection.this[string]")]
protected Option GetOptionForName (string option)
{
if (option == null)
throw new ArgumentNullException ("option");
try {
return base [option];
}
catch (KeyNotFoundException) {
return null;
}
}
protected override void InsertItem (int index, Option item)
{
base.InsertItem (index, item);
AddImpl (item);
}
protected override void RemoveItem (int index)
{
base.RemoveItem (index);
Option p = Items [index];
// KeyedCollection.RemoveItem() handles the 0th item
for (int i = 1; i < p.Names.Length; ++i) {
Dictionary.Remove (p.Names [i]);
}
}
protected override void SetItem (int index, Option item)
{
base.SetItem (index, item);
RemoveItem (index);
AddImpl (item);
}
private void AddImpl (Option option)
{
if (option == null)
throw new ArgumentNullException ("option");
List<string> added = new List<string> (option.Names.Length);
try {
// KeyedCollection.InsertItem/SetItem handle the 0th name.
for (int i = 1; i < option.Names.Length; ++i) {
Dictionary.Add (option.Names [i], option);
added.Add (option.Names [i]);
}
}
catch (Exception) {
foreach (string name in added)
Dictionary.Remove (name);
throw;
}
}
public new OptionSet Add (Option option)
{
base.Add (option);
return this;
}
sealed class ActionOption : Option {
Action<OptionValueCollection> action;
public ActionOption (string prototype, string description, int count, Action<OptionValueCollection> action)
: base (prototype, description, count)
{
if (action == null)
throw new ArgumentNullException ("action");
this.action = action;
}
protected override void OnParseComplete (OptionContext c)
{
action (c.OptionValues);
}
}
public OptionSet Add (string prototype, Action<string> action)
{
return Add (prototype, null, action);
}
public OptionSet Add (string prototype, string description, Action<string> action)
{
if (action == null)
throw new ArgumentNullException ("action");
Option p = new ActionOption (prototype, description, 1,
delegate (OptionValueCollection v) { action (v [0]); });
base.Add (p);
return this;
}
public OptionSet Add (string prototype, OptionAction<string, string> action)
{
return Add (prototype, null, action);
}
public OptionSet Add (string prototype, string description, OptionAction<string, string> action)
{
if (action == null)
throw new ArgumentNullException ("action");
Option p = new ActionOption (prototype, description, 2,
delegate (OptionValueCollection v) {action (v [0], v [1]);});
base.Add (p);
return this;
}
sealed class ActionOption<T> : Option {
Action<T> action;
public ActionOption (string prototype, string description, Action<T> action)
: base (prototype, description, 1)
{
if (action == null)
throw new ArgumentNullException ("action");
this.action = action;
}
protected override void OnParseComplete (OptionContext c)
{
action (Parse<T> (c.OptionValues [0], c));
}
}
sealed class ActionOption<TKey, TValue> : Option {
OptionAction<TKey, TValue> action;
public ActionOption (string prototype, string description, OptionAction<TKey, TValue> action)
: base (prototype, description, 2)
{
if (action == null)
throw new ArgumentNullException ("action");
this.action = action;
}
protected override void OnParseComplete (OptionContext c)
{
action (
Parse<TKey> (c.OptionValues [0], c),
Parse<TValue> (c.OptionValues [1], c));
}
}
public OptionSet Add<T> (string prototype, Action<T> action)
{
return Add (prototype, null, action);
}
public OptionSet Add<T> (string prototype, string description, Action<T> action)
{
return Add (new ActionOption<T> (prototype, description, action));
}
public OptionSet Add<TKey, TValue> (string prototype, OptionAction<TKey, TValue> action)
{
return Add (prototype, null, action);
}
public OptionSet Add<TKey, TValue> (string prototype, string description, OptionAction<TKey, TValue> action)
{
return Add (new ActionOption<TKey, TValue> (prototype, description, action));
}
protected virtual OptionContext CreateOptionContext ()
{
return new OptionContext (this);
}
public List<string> Parse (IEnumerable<string> arguments)
{
bool process = true;
OptionContext c = CreateOptionContext ();
c.OptionIndex = -1;
var def = GetOptionForName ("<>");
var unprocessed =
from argument in arguments
where ++c.OptionIndex >= 0 && (process || def != null)
? process
? argument == "--"
? (process = false)
: !Parse (argument, c)
? def != null
? Unprocessed (null, def, c, argument)
: true
: false
: def != null
? Unprocessed (null, def, c, argument)
: true
: true
select argument;
List<string> r = unprocessed.ToList ();
if (c.Option != null)
c.Option.Invoke (c);
return r;
}
private static bool Unprocessed (ICollection<string> extra, Option def, OptionContext c, string argument)
{
if (def == null) {
extra.Add (argument);
return false;
}
c.OptionValues.Add (argument);
c.Option = def;
c.Option.Invoke (c);
return false;
}
private readonly Regex ValueOption = new Regex (
@"^(?<flag>--|-|/)(?<name>[^:=]+)((?<sep>[:=])(?<value>.*))?$");
protected bool GetOptionParts (string argument, out string flag, out string name, out string sep, out string value)
{
if (argument == null)
throw new ArgumentNullException ("argument");
flag = name = sep = value = null;
Match m = ValueOption.Match (argument);
if (!m.Success) {
return false;
}
flag = m.Groups ["flag"].Value;
name = m.Groups ["name"].Value;
if (m.Groups ["sep"].Success && m.Groups ["value"].Success) {
sep = m.Groups ["sep"].Value;
value = m.Groups ["value"].Value;
}
return true;
}
protected virtual bool Parse (string argument, OptionContext c)
{
if (c.Option != null) {
ParseValue (argument, c);
return true;
}
string f, n, s, v;
if (!GetOptionParts (argument, out f, out n, out s, out v))
return false;
Option p;
if (Contains (n)) {
p = this [n];
c.OptionName = f + n;
c.Option = p;
switch (p.OptionValueType) {
case OptionValueType.None:
c.OptionValues.Add (n);
c.Option.Invoke (c);
break;
case OptionValueType.Optional:
case OptionValueType.Required:
ParseValue (v, c);
break;
}
return true;
}
// no match; is it a bool option?
if (ParseBool (argument, n, c))
return true;
// is it a bundled option?
if (ParseBundledValue (f, string.Concat (n + s + v), c))
return true;
return false;
}
private void ParseValue (string option, OptionContext c)
{
if (option != null)
foreach (string o in c.Option.ValueSeparators != null
? option.Split (c.Option.ValueSeparators, StringSplitOptions.None)
: new string[]{option}) {
c.OptionValues.Add (o);
}
if (c.OptionValues.Count == c.Option.MaxValueCount ||
c.Option.OptionValueType == OptionValueType.Optional)
c.Option.Invoke (c);
else if (c.OptionValues.Count > c.Option.MaxValueCount) {
throw new OptionException (localizer (string.Format (
"Error: Found {0} option values when expecting {1}.",
c.OptionValues.Count, c.Option.MaxValueCount)),
c.OptionName);
}
}
private bool ParseBool (string option, string n, OptionContext c)
{
Option p;
string rn;
if (n.Length >= 1 && (n [n.Length-1] == '+' || n [n.Length-1] == '-') &&
Contains ((rn = n.Substring (0, n.Length-1)))) {
p = this [rn];
string v = n [n.Length-1] == '+' ? option : null;
c.OptionName = option;
c.Option = p;
c.OptionValues.Add (v);
p.Invoke (c);
return true;
}
return false;
}
private bool ParseBundledValue (string f, string n, OptionContext c)
{
if (f != "-")
return false;
for (int i = 0; i < n.Length; ++i) {
Option p;
string opt = f + n [i].ToString ();
string rn = n [i].ToString ();
if (!Contains (rn)) {
if (i == 0)
return false;
throw new OptionException (string.Format (localizer (
"Cannot bundle unregistered option '{0}'."), opt), opt);
}
p = this [rn];
switch (p.OptionValueType) {
case OptionValueType.None:
Invoke (c, opt, n, p);
break;
case OptionValueType.Optional:
case OptionValueType.Required: {
string v = n.Substring (i+1);
c.Option = p;
c.OptionName = opt;
ParseValue (v.Length != 0 ? v : null, c);
return true;
}
default:
throw new InvalidOperationException ("Unknown OptionValueType: " + p.OptionValueType);
}
}
return true;
}
private static void Invoke (OptionContext c, string name, string value, Option option)
{
c.OptionName = name;
c.Option = option;
c.OptionValues.Add (value);
option.Invoke (c);
}
private const int OptionWidth = 29;
public void WriteOptionDescriptions (TextWriter o)
{
foreach (Option p in this) {
int written = 0;
if (!WriteOptionPrototype (o, p, ref written))
continue;
if (written < OptionWidth)
o.Write (new string (' ', OptionWidth - written));
else {
o.WriteLine ();
o.Write (new string (' ', OptionWidth));
}
bool indent = false;
string prefix = new string (' ', OptionWidth+2);
foreach (string line in GetLines (localizer (GetDescription (p.Description)))) {
if (indent)
o.Write (prefix);
o.WriteLine (line);
indent = true;
}
}
}
bool WriteOptionPrototype (TextWriter o, Option p, ref int written)
{
string[] names = p.Names;
int i = GetNextOptionIndex (names, 0);
if (i == names.Length)
return false;
if (names [i].Length == 1) {
Write (o, ref written, " -");
Write (o, ref written, names [0]);
}
else {
Write (o, ref written, " --");
Write (o, ref written, names [0]);
}
for ( i = GetNextOptionIndex (names, i+1);
i < names.Length; i = GetNextOptionIndex (names, i+1)) {
Write (o, ref written, ", ");
Write (o, ref written, names [i].Length == 1 ? "-" : "--");
Write (o, ref written, names [i]);
}
if (p.OptionValueType == OptionValueType.Optional ||
p.OptionValueType == OptionValueType.Required) {
if (p.OptionValueType == OptionValueType.Optional) {
Write (o, ref written, localizer ("["));
}
Write (o, ref written, localizer ("=" + GetArgumentName (0, p.MaxValueCount, p.Description)));
string sep = p.ValueSeparators != null && p.ValueSeparators.Length > 0
? p.ValueSeparators [0]
: " ";
for (int c = 1; c < p.MaxValueCount; ++c) {
Write (o, ref written, localizer (sep + GetArgumentName (c, p.MaxValueCount, p.Description)));
}
if (p.OptionValueType == OptionValueType.Optional) {
Write (o, ref written, localizer ("]"));
}
}
return true;
}
static int GetNextOptionIndex (string[] names, int i)
{
while (i < names.Length && names [i] == "<>") {
++i;
}
return i;
}
static void Write (TextWriter o, ref int n, string s)
{
n += s.Length;
o.Write (s);
}
private static string GetArgumentName (int index, int maxIndex, string description)
{
if (description == null)
return maxIndex == 1 ? "VALUE" : "VALUE" + (index + 1);
string[] nameStart;
if (maxIndex == 1)
nameStart = new string[]{"{0:", "{"};
else
nameStart = new string[]{"{" + index + ":"};
for (int i = 0; i < nameStart.Length; ++i) {
int start, j = 0;
do {
start = description.IndexOf (nameStart [i], j);
} while (start >= 0 && j != 0 ? description [j++ - 1] == '{' : false);
if (start == -1)
continue;
int end = description.IndexOf ("}", start);
if (end == -1)
continue;
return description.Substring (start + nameStart [i].Length, end - start - nameStart [i].Length);
}
return maxIndex == 1 ? "VALUE" : "VALUE" + (index + 1);
}
private static string GetDescription (string description)
{
if (description == null)
return string.Empty;
StringBuilder sb = new StringBuilder (description.Length);
int start = -1;
for (int i = 0; i < description.Length; ++i) {
switch (description [i]) {
case '{':
if (i == start) {
sb.Append ('{');
start = -1;
}
else if (start < 0)
start = i + 1;
break;
case '}':
if (start < 0) {
if ((i+1) == description.Length || description [i+1] != '}')
throw new InvalidOperationException ("Invalid option description: " + description);
++i;
sb.Append ("}");
}
else {
sb.Append (description.Substring (start, i - start));
start = -1;
}
break;
case ':':
if (start < 0)
goto default;
start = i + 1;
break;
default:
if (start < 0)
sb.Append (description [i]);
break;
}
}
return sb.ToString ();
}
private static IEnumerable<string> GetLines (string description)
{
if (string.IsNullOrEmpty (description)) {
yield return string.Empty;
yield break;
}
int length = 80 - OptionWidth - 1;
int start = 0, end;
do {
end = GetLineEnd (start, length, description);
char c = description [end-1];
if (char.IsWhiteSpace (c))
--end;
bool writeContinuation = end != description.Length && !IsEolChar (c);
string line = description.Substring (start, end - start) +
(writeContinuation ? "-" : "");
yield return line;
start = end;
if (char.IsWhiteSpace (c))
++start;
length = 80 - OptionWidth - 2 - 1;
} while (end < description.Length);
}
private static bool IsEolChar (char c)
{
return !char.IsLetterOrDigit (c);
}
private static int GetLineEnd (int start, int length, string description)
{
int end = System.Math.Min (start + length, description.Length);
int sep = -1;
for (int i = start+1; i < end; ++i) {
if (description [i] == '\n')
return i+1;
if (IsEolChar (description [i]))
sep = i+1;
}
if (sep == -1 || end == description.Length)
return end;
return sep;
}
}
}
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