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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Newtonsoft.Json.Bson;
using System.Globalization;
namespace Newtonsoft.Json.Converters
{
/// <summary>
/// Converts a <see cref="Regex"/> to and from JSON and BSON.
/// </summary>
public class RegexConverter : JsonConverter
{
/// <summary>
/// Writes the JSON representation of the object.
/// </summary>
/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
/// <param name="value">The value.</param>
/// <param name="serializer">The calling serializer.</param>
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
Regex regex = (Regex) value;
BsonWriter bsonWriter = writer as BsonWriter;
if (bsonWriter != null)
WriteBson(bsonWriter, regex);
else
WriteJson(writer, regex);
}
private bool HasFlag(RegexOptions options, RegexOptions flag)
{
return ((options & flag) == flag);
}
private void WriteBson(BsonWriter writer, Regex regex)
{
// Regular expression - The first cstring is the regex pattern, the second
// is the regex options string. Options are identified by characters, which
// must be stored in alphabetical order. Valid options are 'i' for case
// insensitive matching, 'm' for multiline matching, 'x' for verbose mode,
// 'l' to make \w, \W, etc. locale dependent, 's' for dotall mode
// ('.' matches everything), and 'u' to make \w, \W, etc. match unicode.
string options = null;
if (HasFlag(regex.Options, RegexOptions.IgnoreCase))
options += "i";
if (HasFlag(regex.Options, RegexOptions.Multiline))
options += "m";
if (HasFlag(regex.Options, RegexOptions.Singleline))
options += "s";
options += "u";
if (HasFlag(regex.Options, RegexOptions.ExplicitCapture))
options += "x";
writer.WriteRegex(regex.ToString(), options);
}
private void WriteJson(JsonWriter writer, Regex regex)
{
writer.WriteStartObject();
writer.WritePropertyName("Pattern");
writer.WriteValue(regex.ToString());
writer.WritePropertyName("Options");
writer.WriteValue(regex.Options);
writer.WriteEndObject();
}
/// <summary>
/// Reads the JSON representation of the object.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
/// <param name="objectType">Type of the object.</param>
/// <param name="existingValue">The existing value of object being read.</param>
/// <param name="serializer">The calling serializer.</param>
/// <returns>The object value.</returns>
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
BsonReader bsonReader = reader as BsonReader;
if (bsonReader != null)
return ReadBson(bsonReader);
else
return ReadJson(reader);
}
private object ReadBson(BsonReader reader)
{
string regexText = (string)reader.Value;
int patternOptionDelimiterIndex = regexText.LastIndexOf('/');
string patternText = regexText.Substring(1, patternOptionDelimiterIndex - 1);
string optionsText = regexText.Substring(patternOptionDelimiterIndex + 1);
RegexOptions options = RegexOptions.None;
foreach (char c in optionsText)
{
switch (c)
{
case 'i':
options |= RegexOptions.IgnoreCase;
break;
case 'm':
options |= RegexOptions.Multiline;
break;
case 's':
options |= RegexOptions.Singleline;
break;
case 'x':
options |= RegexOptions.ExplicitCapture;
break;
}
}
return new Regex(patternText, options);
}
private Regex ReadJson(JsonReader reader)
{
reader.Read();
reader.Read();
string pattern = (string)reader.Value;
reader.Read();
reader.Read();
int options = Convert.ToInt32(reader.Value, CultureInfo.InvariantCulture);
reader.Read();
return new Regex(pattern, (RegexOptions) options);
}
/// <summary>
/// Determines whether this instance can convert the specified object type.
/// </summary>
/// <param name="objectType">Type of the object.</param>
/// <returns>
/// <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
/// </returns>
public override bool CanConvert(Type objectType)
{
return (objectType == typeof (Regex));
}
}
}
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