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//
// IWordFindStrategy.cs
//
// Author:
// Mike Krüger <mkrueger@novell.com>
//
// Copyright (C) 2008 Novell, Inc (http://www.novell.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;
namespace Mono.TextEditor
{
public interface IWordFindStrategy
{
int FindNextWordOffset (TextDocument doc, int offset);
int FindPrevWordOffset (TextDocument doc, int offset);
int FindNextSubwordOffset (TextDocument doc, int offset);
int FindPrevSubwordOffset (TextDocument doc, int offset);
int FindCurrentWordStart (TextDocument doc, int offset);
int FindCurrentWordEnd (TextDocument doc, int offset);
}
public abstract class WordFindStrategy : IWordFindStrategy
{
public enum CharacterClass {
Unknown,
Whitespace,
IdentifierPart,
UppercaseLetter,
LowercaseLetter,
Digit
}
public static CharacterClass GetCharacterClass (char ch)
{
return GetCharacterClass (ch, false, false);
}
public static CharacterClass GetCharacterClass (char ch, bool subword, bool includeUnderscore)
{
if (Char.IsWhiteSpace (ch))
return CharacterClass.Whitespace;
if (Char.IsDigit (ch))
return subword? CharacterClass.Digit : CharacterClass.IdentifierPart;
if (Char.IsLetter (ch)) {
if (!subword)
return CharacterClass.IdentifierPart;
else if (Char.IsUpper (ch))
return CharacterClass.UppercaseLetter;
else
return CharacterClass.LowercaseLetter;
}
if (!subword && includeUnderscore && ch == '_')
return CharacterClass.IdentifierPart;
return CharacterClass.Unknown;
}
public abstract int FindNextWordOffset (TextDocument doc, int offset);
public abstract int FindPrevWordOffset (TextDocument doc, int offset);
public virtual int FindNextSubwordOffset (TextDocument doc, int offset)
{
return FindNextWordOffset (doc, offset);
}
public virtual int FindPrevSubwordOffset (TextDocument doc, int offset)
{
return FindPrevWordOffset (doc, offset);
}
public virtual int FindCurrentWordStart (TextDocument doc, int offset)
{
return ScanWord (doc, offset, false);
}
public virtual int FindCurrentWordEnd (TextDocument doc, int offset)
{
return ScanWord (doc, offset, true);
}
internal static int ScanWord (TextDocument doc, int offset, bool forwardDirection)
{
if (offset < 0 || offset >= doc.TextLength)
return offset;
var line = doc.GetLineByOffset (offset);
char first = doc.GetCharAt (offset);
while (offset >= line.Offset && offset < line.Offset + line.Length) {
char ch = doc.GetCharAt (offset);
if (char.IsWhiteSpace (first) && !char.IsWhiteSpace (ch)
|| IsNoIdentifierPart (first) && !IsNoIdentifierPart (ch)
|| (char.IsLetterOrDigit (first) || first == '_') && !(char.IsLetterOrDigit (ch) || ch == '_'))
break;
offset = forwardDirection ? offset + 1 : offset - 1;
}
return System.Math.Min (line.Offset + line.Length,
System.Math.Max (line.Offset, offset + (forwardDirection ? 0 : 1)));
}
internal static bool IsNoIdentifierPart (char ch)
{
return !char.IsWhiteSpace (ch) && !char.IsLetterOrDigit (ch) && ch != '_';
}
}
}
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