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//
// StringTextSource.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2014 Xamarin Inc. (http://xamarin.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.
using System;
using System.Text;
using System.IO;
namespace MonoDevelop.Core.Text
{
/// <summary>
/// Implements the ITextSource interface using a string.
/// Note that objects from this class are immutable.
/// </summary>
[Serializable]
public class StringTextSource : ITextSource
{
/// <summary>
/// Gets a text source containing the empty string.
/// </summary>
public static readonly StringTextSource Empty = new StringTextSource (string.Empty);
readonly string text;
readonly ITextSourceVersion version;
/// <summary>
/// Determines if a byte order mark was read or is going to be written.
/// </summary>
public bool UseBOM { get; private set; }
/// <summary>
/// Encoding of the text that was read from or is going to be saved to.
/// </summary>
public Encoding Encoding { get; private set; }
/// <summary>
/// Creates a new StringTextSource with the given text.
/// </summary>
public StringTextSource (string text, Encoding encoding = null, bool useBom = true)
{
if (text == null)
throw new ArgumentNullException ("text");
this.text = text;
this.UseBOM = useBom;
this.Encoding = encoding ?? Encoding.UTF8;
}
/// <summary>
/// Creates a new StringTextSource with the given text.
/// </summary>
public StringTextSource (string text, ITextSourceVersion version, Encoding encoding = null, bool useBom = true)
{
if (text == null)
throw new ArgumentNullException ("text");
this.text = text;
this.version = version;
this.UseBOM = useBom;
this.Encoding = encoding ?? Encoding.UTF8;
}
/// <inheritdoc/>
public ITextSourceVersion Version {
get { return version; }
}
/// <inheritdoc/>
public int Length {
get { return text.Length; }
}
/// <inheritdoc/>
public string Text {
get { return text; }
}
/// <inheritdoc/>
public ITextSource CreateSnapshot ()
{
return this; // StringTextSource is immutable
}
/// <inheritdoc/>
public ITextSource CreateSnapshot (int offset, int length)
{
return new StringTextSource (text.Substring (offset, length));
}
/// <inheritdoc/>
public char GetCharAt (int offset)
{
return text [offset];
}
public char this [int offset] {
get {
return text [offset];
}
}
/// <inheritdoc/>
public string GetTextAt (int offset, int length)
{
return text.Substring (offset, length);
}
public StringTextSource WithEncoding (Encoding encoding)
{
return new StringTextSource (text, encoding, UseBOM);
}
public StringTextSource WithBom (bool useBom)
{
return new StringTextSource (text, Encoding, useBom);
}
public static StringTextSource ReadFrom (string fileName)
{
bool hadBom;
Encoding encoding;
var text = TextFileUtility.ReadAllText (fileName, out hadBom, out encoding);
return new StringTextSource (text, encoding, hadBom);
}
/// <inheritdoc/>
public TextReader CreateReader ()
{
return new StringReader (text);
}
/// <inheritdoc/>
public TextReader CreateReader (int offset, int length)
{
return new StringReader (text.Substring (offset, length));
}
/// <inheritdoc/>
public void WriteTextTo (TextWriter writer)
{
if (writer == null)
throw new ArgumentNullException ("writer");
writer.Write (text);
}
/// <inheritdoc/>
public void WriteTextTo (TextWriter writer, int offset, int length)
{
if (writer == null)
throw new ArgumentNullException ("writer");
writer.Write (text.Substring (offset, length));
}
}
}
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