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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using StardewModdingAPI;
namespace TrainerMod.Framework.Commands
{
/// <summary>Provides methods for parsing command-line arguments.</summary>
internal class ArgumentParser : IReadOnlyList<string>
{
/*********
** Properties
*********/
/// <summary>The command name for errors.</summary>
private readonly string CommandName;
/// <summary>The arguments to parse.</summary>
private readonly string[] Args;
/// <summary>Writes messages to the console and log file.</summary>
private readonly IMonitor Monitor;
/*********
** Accessors
*********/
/// <summary>Get the number of arguments.</summary>
public int Count => this.Args.Length;
/// <summary>Get the argument at the specified index in the list.</summary>
/// <param name="index">The zero-based index of the element to get.</param>
public string this[int index] => this.Args[index];
/// <summary>A method which parses a string argument into the given value.</summary>
/// <typeparam name="T">The expected argument type.</typeparam>
/// <param name="input">The argument to parse.</param>
/// <param name="output">The parsed value.</param>
/// <returns>Returns whether the argument was successfully parsed.</returns>
public delegate bool ParseDelegate<T>(string input, out T output);
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="commandName">The command name for errors.</param>
/// <param name="args">The arguments to parse.</param>
/// <param name="monitor">Writes messages to the console and log file.</param>
public ArgumentParser(string commandName, string[] args, IMonitor monitor)
{
this.CommandName = commandName;
this.Args = args;
this.Monitor = monitor;
}
/// <summary>Try to read a string argument.</summary>
/// <param name="index">The argument index.</param>
/// <param name="name">The argument name for error messages.</param>
/// <param name="value">The parsed value.</param>
/// <param name="required">Whether to show an error if the argument is missing.</param>
/// <param name="oneOf">Require that the argument match one of the given values (case-insensitive).</param>
public bool TryGet(int index, string name, out string value, bool required = true, string[] oneOf = null)
{
value = null;
// validate
if (this.Args.Length < index + 1)
{
if (required)
this.LogError($"Argument {index} ({name}) is required.");
return false;
}
if (oneOf?.Any() == true && !oneOf.Contains(this.Args[index], StringComparer.InvariantCultureIgnoreCase))
{
this.LogError($"Argument {index} ({name}) must be one of {string.Join(", ", oneOf)}.");
return false;
}
// get value
value = this.Args[index];
return true;
}
/// <summary>Try to read an integer argument.</summary>
/// <param name="index">The argument index.</param>
/// <param name="name">The argument name for error messages.</param>
/// <param name="value">The parsed value.</param>
/// <param name="required">Whether to show an error if the argument is missing.</param>
/// <param name="min">The minimum value allowed.</param>
/// <param name="max">The maximum value allowed.</param>
public bool TryGetInt(int index, string name, out int value, bool required = true, int? min = null, int? max = null)
{
value = 0;
// get argument
if (!this.TryGet(index, name, out string raw, required))
return false;
// parse
if (!int.TryParse(raw, out value))
{
this.LogIntFormatError(index, name, min, max);
return false;
}
// validate
if ((min.HasValue && value < min) || (max.HasValue && value > max))
{
this.LogIntFormatError(index, name, min, max);
return false;
}
return true;
}
/// <summary>Returns an enumerator that iterates through the collection.</summary>
/// <returns>An enumerator that can be used to iterate through the collection.</returns>
public IEnumerator<string> GetEnumerator()
{
return ((IEnumerable<string>)this.Args).GetEnumerator();
}
/// <summary>Returns an enumerator that iterates through a collection.</summary>
/// <returns>An <see cref="T:System.Collections.IEnumerator" /> object that can be used to iterate through the collection.</returns>
IEnumerator IEnumerable.GetEnumerator()
{
return this.GetEnumerator();
}
/*********
** Private methods
*********/
/// <summary>Log a usage error.</summary>
/// <param name="message">The message describing the error.</param>
private void LogError(string message)
{
this.Monitor.Log($"{message} Type 'help {this.CommandName}' for usage.", LogLevel.Error);
}
/// <summary>Print an error for an invalid int argument.</summary>
/// <param name="index">The argument index.</param>
/// <param name="name">The argument name for error messages.</param>
/// <param name="min">The minimum value allowed.</param>
/// <param name="max">The maximum value allowed.</param>
private void LogIntFormatError(int index, string name, int? min, int? max)
{
if (min.HasValue && max.HasValue)
this.LogError($"Argument {index} ({name}) must be an integer between {min} and {max}.");
else if (min.HasValue)
this.LogError($"Argument {index} ({name}) must be an integer and at least {min}.");
else if (max.HasValue)
this.LogError($"Argument {index} ({name}) must be an integer and at most {max}.");
else
this.LogError($"Argument {index} ({name}) must be an integer.");
}
}
}
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