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using System;
using System.Collections.Generic;
using System.ComponentModel;
namespace Mono.Options
{
public abstract class Option
{
static readonly char[] NameTerminator = { '=', ':' };
protected Option(string prototype, string description)
: this(prototype, description, 1, false)
{
}
protected Option(string prototype, string description, int maxValueCount)
: this(prototype, description, maxValueCount, false)
{
}
protected Option(string prototype, string description, int maxValueCount, bool hidden)
{
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");
Prototype = prototype;
Description = description;
MaxValueCount = maxValueCount;
Names = (this is OptionSet.Category)
// append GetHashCode() so that "duplicate" categories have distinct
// names, e.g. adding multiple "" categories should be valid.
? new[] { prototype + GetHashCode() }
: prototype.Split('|');
if (this is OptionSet.Category)
return;
OptionValueType = ParsePrototype();
Hidden = hidden;
if (MaxValueCount == 0 && OptionValueType != OptionValueType.None)
{
throw new ArgumentException(
"Cannot provide maxValueCount of 0 for OptionValueType.Required or " +
"OptionValueType.Optional.",
"maxValueCount");
}
if (OptionValueType == 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 && OptionValueType != OptionValueType.None) ||
(Names.Length > 1 && MaxValueCount > 1)))
{
throw new ArgumentException(
"The default option handler '<>' cannot require values.",
"prototype");
}
}
public string Prototype { get; }
public string Description { get; }
public OptionValueType OptionValueType { get; }
public int MaxValueCount { get; }
public bool Hidden { get; }
internal string[] Names { get; }
internal string[] ValueSeparators { get; private set; }
public string[] GetNames()
{
return (string[])Names.Clone();
}
public string[] GetValueSeparators()
{
if (ValueSeparators == null)
return new string[0];
return (string[])ValueSeparators.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;
}
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 (MaxValueCount <= 1 && seps.Count != 0)
{
throw new ArgumentException(
string.Format("Cannot provide key/value separators for Options taking {0} value(s).", MaxValueCount),
"prototype");
}
if (MaxValueCount > 1)
{
if (seps.Count == 0)
ValueSeparators = new[] { ":", "=" };
else if (seps.Count == 1 && seps[0].Length == 0)
ValueSeparators = null;
else
ValueSeparators = seps.ToArray();
}
return type == '=' ? OptionValueType.Required : OptionValueType.Optional;
}
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;
}
}
}
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