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//
// EmacsWordFindStrategy.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 docation 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 CC = Mono.TextEditor.WordFindStrategy.CharacterClass;
using SW = Mono.TextEditor.WordFindStrategy;
namespace Mono.TextEditor
{
public class EmacsWordFindStrategy : WordFindStrategy
{
bool treat_;
public EmacsWordFindStrategy (bool treat_)
{
this.treat_ = treat_;
}
int FindNextWordOffset (TextDocument doc, int offset, bool subword)
{
if (offset + 1 >= doc.TextLength)
return doc.TextLength;
int result = offset + 1;
CC previous = SW.GetCharacterClass (doc.GetCharAt (result), subword, treat_);
bool inIndentifier = previous != CC.Unknown && previous != CC.Whitespace;
while (result < doc.TextLength) {
char ch = doc.GetCharAt (result);
CC current = SW.GetCharacterClass (ch, subword, treat_);
//camelCase / PascalCase splitting
if (subword) {
if (current == CC.Digit && (previous != CC.Digit || (result-1 == offset && !Char.IsDigit (doc.GetCharAt (result-1))))) {
break;
} else if (previous == CC.Digit && current != CC.Digit) {
break;
} else if (current == CC.UppercaseLetter && previous != CC.UppercaseLetter) {
break;
} else if (current == CC.LowercaseLetter && previous == CC.UppercaseLetter && result - 2 > 0
&& SW.GetCharacterClass (doc.GetCharAt (result - 2), subword, treat_) != CC.LowercaseLetter)
{
result--;
break;
}
}
//else break at end of identifiers
if (previous != CC.Unknown && previous != CC.Whitespace) {
inIndentifier = true;
} else if (inIndentifier) {
result--;
break;
}
previous = current;
result++;
}
foreach (FoldSegment segment in doc.GetFoldingsFromOffset (result)) {
if (segment.IsFolded)
result = System.Math.Max (result, segment.EndLine.Offset + segment.EndColumn);
}
return result;
}
int FindPrevWordOffset (TextDocument doc, int offset, bool subword)
{
if (offset <= 0)
return 0;
int result = offset - 1;
CC previous = SW.GetCharacterClass (doc.GetCharAt (result), subword, treat_);
bool inIndentifier = previous != CC.Unknown && previous != CC.Whitespace;
while (result > 0) {
char ch = doc.GetCharAt (result);
CC current = SW.GetCharacterClass (ch, subword, treat_);
//camelCase / PascalCase splitting
if (subword) {
if (current == CC.Digit && previous != CC.Digit) {
result++;
break;
} else if (previous == CC.Digit && current != CC.Digit) {
result++;
break;
} else if (current == CC.UppercaseLetter && previous != CC.UppercaseLetter) {
break;
} else if (current == CC.LowercaseLetter && previous == CC.UppercaseLetter && result + 2 < doc.TextLength
&& SW.GetCharacterClass (doc.GetCharAt (result + 2), subword, treat_) != CC.LowercaseLetter)
{
result++;
break;
}
}
//else break at end of identifiers
if (previous != CC.Unknown && previous != CC.Whitespace) {
inIndentifier = true;
} else if (inIndentifier) {
result += 2;
break;
}
previous = current;
result--;
}
foreach (FoldSegment segment in doc.GetFoldingsFromOffset (result)) {
if (segment.IsFolded)
result = System.Math.Min (result, segment.StartLine.Offset + segment.Column);
}
return result;
}
public override int FindNextWordOffset (TextDocument doc, int offset)
{
return FindNextWordOffset (doc, offset, false);
}
public override int FindPrevWordOffset (TextDocument doc, int offset)
{
return FindPrevWordOffset (doc, offset, false);
}
public override int FindNextSubwordOffset (TextDocument doc, int offset)
{
return FindNextWordOffset (doc, offset, true);
}
public override int FindPrevSubwordOffset (TextDocument doc, int offset)
{
return FindPrevWordOffset (doc, offset, true);
}
}
}
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