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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
namespace StardewModdingAPI.Toolkit.Framework.Clients.Wiki
{
/// <summary>A set of changes which can be applied to a mod data field.</summary>
public class ChangeDescriptor
{
/*********
** Accessors
*********/
/// <summary>The values to add to the field.</summary>
public ISet<string> Add { get; }
/// <summary>The values to remove from the field.</summary>
public ISet<string> Remove { get; }
/// <summary>The values to replace in the field, if matched.</summary>
public IReadOnlyDictionary<string, string> Replace { get; }
/// <summary>Whether the change descriptor would make any changes.</summary>
public bool HasChanges { get; }
/// <summary>Format a raw value into a normalized form.</summary>
public Func<string, string> FormatValue { get; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="add">The values to add to the field.</param>
/// <param name="remove">The values to remove from the field.</param>
/// <param name="replace">The values to replace in the field, if matched.</param>
/// <param name="formatValue">Format a raw value into a normalized form.</param>
public ChangeDescriptor(ISet<string> add, ISet<string> remove, IReadOnlyDictionary<string, string> replace, Func<string, string> formatValue)
{
this.Add = add;
this.Remove = remove;
this.Replace = replace;
this.HasChanges = add.Any() || remove.Any() || replace.Any();
this.FormatValue = formatValue;
}
/// <summary>Apply the change descriptors to a comma-delimited field.</summary>
/// <param name="rawField">The raw field text.</param>
/// <returns>Returns the modified field.</returns>
public string ApplyToCopy(string rawField)
{
// get list
List<string> values = !string.IsNullOrWhiteSpace(rawField)
? new List<string>(rawField.Split(','))
: new List<string>();
// apply changes
this.Apply(values);
// format
if (rawField == null && !values.Any())
return null;
return string.Join(", ", values);
}
/// <summary>Apply the change descriptors to the given field values.</summary>
/// <param name="values">The field values.</param>
/// <returns>Returns the modified field values.</returns>
public void Apply(List<string> values)
{
// replace/remove values
if (this.Replace.Any() || this.Remove.Any())
{
for (int i = values.Count - 1; i >= 0; i--)
{
string value = this.FormatValue(values[i]?.Trim() ?? string.Empty);
if (this.Remove.Contains(value))
values.RemoveAt(i);
else if (this.Replace.TryGetValue(value, out string newValue))
values[i] = newValue;
}
}
// add values
if (this.Add.Any())
{
HashSet<string> curValues = new HashSet<string>(values.Select(p => p?.Trim() ?? string.Empty), StringComparer.OrdinalIgnoreCase);
foreach (string add in this.Add)
{
if (!curValues.Contains(add))
{
values.Add(add);
curValues.Add(add);
}
}
}
}
/// <inheritdoc />
public override string ToString()
{
if (!this.HasChanges)
return string.Empty;
List<string> descriptors = new List<string>(this.Add.Count + this.Remove.Count + this.Replace.Count);
foreach (string add in this.Add)
descriptors.Add($"+{add}");
foreach (string remove in this.Remove)
descriptors.Add($"-{remove}");
foreach (var pair in this.Replace)
descriptors.Add($"{pair.Key} → {pair.Value}");
return string.Join(", ", descriptors);
}
/// <summary>Parse a raw change descriptor string into a <see cref="ChangeDescriptor"/> model.</summary>
/// <param name="descriptor">The raw change descriptor.</param>
/// <param name="errors">The human-readable error message describing any invalid values that were ignored.</param>
/// <param name="formatValue">Format a raw value into a normalized form if needed.</param>
public static ChangeDescriptor Parse(string descriptor, out string[] errors, Func<string, string> formatValue = null)
{
// init
formatValue ??= p => p;
var add = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
var remove = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
var replace = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
// parse each change in the descriptor
if (!string.IsNullOrWhiteSpace(descriptor))
{
List<string> rawErrors = new List<string>();
foreach (string rawEntry in descriptor.Split(','))
{
// normalize entry
string entry = rawEntry.Trim();
if (entry == string.Empty)
continue;
// parse as replace (old value → new value)
if (entry.Contains('→'))
{
string[] parts = entry.Split(new[] { '→' }, 2);
string oldValue = formatValue(parts[0].Trim());
string newValue = formatValue(parts[1].Trim());
if (oldValue == string.Empty)
{
rawErrors.Add($"Failed parsing '{rawEntry}': can't map from a blank old value. Use the '+value' format to add a value.");
continue;
}
if (newValue == string.Empty)
{
rawErrors.Add($"Failed parsing '{rawEntry}': can't map to a blank value. Use the '-value' format to remove a value.");
continue;
}
replace[oldValue] = newValue;
}
// else as remove
else if (entry.StartsWith("-"))
{
entry = formatValue(entry.Substring(1).Trim());
remove.Add(entry);
}
// else as add
else
{
if (entry.StartsWith("+"))
entry = formatValue(entry.Substring(1).Trim());
add.Add(entry);
}
}
errors = rawErrors.ToArray();
}
else
errors = new string[0];
// build model
return new ChangeDescriptor(
add: add,
remove: remove,
replace: new ReadOnlyDictionary<string, string>(replace),
formatValue: formatValue
);
}
}
}
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