src/stc/scintilla/src/Document.h

   1 // Scintilla source code edit control
   2 /** @file Document.h
   3  ** Text document that handles notifications, DBCS, styling, words and end of line.
   4  **/
   5 // Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #ifndef DOCUMENT_H
   9 #define DOCUMENT_H
  10
  11 /**
  12  * A Position is a position within a document between two characters or at the beginning or end.
  13  * Sometimes used as a character index where it identifies the character after the position.
  14  */
  15 typedef int Position;
  16 const Position invalidPosition = -1;
  17
  18 /**
  19  * The range class represents a range of text in a document.
  20  * The two values are not sorted as one end may be more significant than the other
  21  * as is the case for the selection where the end position is the position of the caret.
  22  * If either position is invalidPosition then the range is invalid and most operations will fail.
  23  */
  24 class Range {
  25 public:
  26         Position start;
  27         Position end;
  28
  29         Range(Position pos=0) :
  30                 start(pos), end(pos) {
  31         };
  32         Range(Position start_, Position end_) :
  33                 start(start_), end(end_) {
  34         };
  35
  36         bool Valid() const {
  37                 return (start != invalidPosition) && (end != invalidPosition);
  38         }
  39
  40         // Is the position within the range?
  41         bool Contains(Position pos) const {
  42                 if (start < end) {
  43                         return (pos >= start && pos <= end);
  44                 } else {
  45                         return (pos <= start && pos >= end);
  46                 }
  47         }
  48
  49         // Is the character after pos within the range?
  50         bool ContainsCharacter(Position pos) const {
  51                 if (start < end) {
  52                         return (pos >= start && pos < end);
  53                 } else {
  54                         return (pos < start && pos >= end);
  55                 }
  56         }
  57
  58         bool Contains(Range other) const {
  59                 return Contains(other.start) && Contains(other.end);
  60         }
  61
  62         bool Overlaps(Range other) const {
  63                 return
  64                 Contains(other.start) ||
  65                 Contains(other.end) ||
  66                 other.Contains(start) ||
  67                 other.Contains(end);
  68         }
  69 };
  70
  71 class DocWatcher;
  72 class DocModification;
  73 class RESearch;
  74
  75 /**
  76  */
  77 class Document {
  78
  79 public:
  80         /** Used to pair watcher pointer with user data. */
  81         class WatcherWithUserData {
  82         public:
  83                 DocWatcher *watcher;
  84                 void *userData;
  85                 WatcherWithUserData() {
  86                         watcher = 0;
  87                         userData = 0;
  88                 }
  89         };
  90
  91         enum charClassification { ccSpace, ccNewLine, ccWord, ccPunctuation };
  92
  93 private:
  94         int refCount;
  95         CellBuffer cb;
  96         charClassification charClass[256];
  97         char stylingMask;
  98         int endStyled;
  99         int styleClock;
 100         int enteredCount;
 101         int enteredReadOnlyCount;
 102
 103         WatcherWithUserData *watchers;
 104         int lenWatchers;
 105
 106         bool matchesValid;
 107         RESearch *pre;
 108         char *substituted;
 109
 110 public:
 111         int stylingBits;
 112         int stylingBitsMask;
 113
 114         int eolMode;
 115         /// Can also be SC_CP_UTF8 to enable UTF-8 mode
 116         int dbcsCodePage;
 117         int tabInChars;
 118         int indentInChars;
 119         bool useTabs;
 120         bool tabIndents;
 121         bool backspaceUnindents;
 122
 123         Document();
 124         virtual ~Document();
 125
 126         int AddRef();
 127         int Release();
 128
 129         int LineFromPosition(int pos);
 130         int ClampPositionIntoDocument(int pos);
 131         bool IsCrLf(int pos);
 132         int LenChar(int pos);
 133         int MovePositionOutsideChar(int pos, int moveDir, bool checkLineEnd=true);
 134
 135         // Gateways to modifying document
 136         bool DeleteChars(int pos, int len);
 137         bool InsertStyledString(int position, char *s, int insertLength);
 138         int Undo();
 139         int Redo();
 140         bool CanUndo() { return cb.CanUndo(); }
 141         bool CanRedo() { return cb.CanRedo(); }
 142         void DeleteUndoHistory() { cb.DeleteUndoHistory(); }
 143         bool SetUndoCollection(bool collectUndo) {
 144                 return cb.SetUndoCollection(collectUndo);
 145         }
 146         bool IsCollectingUndo() { return cb.IsCollectingUndo(); }
 147         void BeginUndoAction() { cb.BeginUndoAction(); }
 148         void EndUndoAction() { cb.EndUndoAction(); }
 149         void SetSavePoint();
 150         bool IsSavePoint() { return cb.IsSavePoint(); }
 151
 152         int GetLineIndentation(int line);
 153         void SetLineIndentation(int line, int indent);
 154         int GetLineIndentPosition(int line);
 155         int GetColumn(int position);
 156         int FindColumn(int line, int column);
 157         void Indent(bool forwards, int lineBottom, int lineTop);
 158         void ConvertLineEnds(int eolModeSet);
 159         void SetReadOnly(bool set) { cb.SetReadOnly(set); }
 160         bool IsReadOnly() { return cb.IsReadOnly(); }
 161
 162         bool InsertChar(int pos, char ch);
 163         bool InsertString(int position, const char *s);
 164         bool InsertString(int position, const char *s, size_t insertLength);
 165         void ChangeChar(int pos, char ch);
 166         void DelChar(int pos);
 167         void DelCharBack(int pos);
 168
 169         char CharAt(int position) { return cb.CharAt(position); }
 170         void GetCharRange(char *buffer, int position, int lengthRetrieve) {
 171                 cb.GetCharRange(buffer, position, lengthRetrieve);
 172         }
 173         char StyleAt(int position) { return cb.StyleAt(position); }
 174         int GetMark(int line) { return cb.GetMark(line); }
 175         int AddMark(int line, int markerNum);
 176         void DeleteMark(int line, int markerNum);
 177         void DeleteMarkFromHandle(int markerHandle);
 178         void DeleteAllMarks(int markerNum);
 179         int LineFromHandle(int markerHandle) { return cb.LineFromHandle(markerHandle); }
 180         int LineStart(int line);
 181         int LineEnd(int line);
 182         int LineEndPosition(int position);
 183         int VCHomePosition(int position);
 184
 185         int SetLevel(int line, int level);
 186         int GetLevel(int line) { return cb.GetLevel(line); }
 187         void ClearLevels() { cb.ClearLevels(); }
 188         int GetLastChild(int lineParent, int level=-1);
 189         int GetFoldParent(int line);
 190
 191         void Indent(bool forwards);
 192         int ExtendWordSelect(int pos, int delta, bool onlyWordCharacters=false);
 193         int NextWordStart(int pos, int delta);
 194         int NextWordEnd(int pos, int delta);
 195         int Length() { return cb.Length(); }
 196         long FindText(int minPos, int maxPos, const char *s,
 197                 bool caseSensitive, bool word, bool wordStart, bool regExp, bool posix, int *length);
 198         long FindText(int iMessage, unsigned long wParam, long lParam);
 199         const char *SubstituteByPosition(const char *text, int *length);
 200         int LinesTotal();
 201
 202         void ChangeCase(Range r, bool makeUpperCase);
 203
 204         void SetDefaultCharClasses();
 205         void SetCharClasses(unsigned char *chars, charClassification newCharClass);
 206         void SetStylingBits(int bits);
 207         void StartStyling(int position, char mask);
 208         bool SetStyleFor(int length, char style);
 209         bool SetStyles(int length, char *styles);
 210         int GetEndStyled() { return endStyled; }
 211         bool EnsureStyledTo(int pos);
 212         int GetStyleClock() { return styleClock; }
 213
 214         int SetLineState(int line, int state) { return cb.SetLineState(line, state); }
 215         int GetLineState(int line) { return cb.GetLineState(line); }
 216         int GetMaxLineState() { return cb.GetMaxLineState(); }
 217
 218         bool AddWatcher(DocWatcher *watcher, void *userData);
 219         bool RemoveWatcher(DocWatcher *watcher, void *userData);
 220         const WatcherWithUserData *GetWatchers() const { return watchers; }
 221         int GetLenWatchers() const { return lenWatchers; }
 222
 223         bool IsWordPartSeparator(char ch);
 224         int WordPartLeft(int pos);
 225         int WordPartRight(int pos);
 226         int ExtendStyleRange(int pos, int delta, bool singleLine = false);
 227         int ParaUp(int pos);
 228         int ParaDown(int pos);
 229
 230 private:
 231         charClassification WordCharClass(unsigned char ch);
 232         bool IsWordStartAt(int pos);
 233         bool IsWordEndAt(int pos);
 234         bool IsWordAt(int start, int end);
 235         void ModifiedAt(int pos);
 236
 237         void NotifyModifyAttempt();
 238         void NotifySavePoint(bool atSavePoint);
 239         void NotifyModified(DocModification mh);
 240
 241         int IndentSize() { return indentInChars ? indentInChars : tabInChars; }
 242 };
 243
 244 /**
 245  * To optimise processing of document modifications by DocWatchers, a hint is passed indicating the
 246  * scope of the change.
 247  * If the DocWatcher is a document view then this can be used to optimise screen updating.
 248  */
 249 class DocModification {
 250 public:
 251         int modificationType;
 252         int position;
 253         int length;
 254         int linesAdded; /**< Negative if lines deleted. */
 255         const char *text;       /**< Only valid for changes to text, not for changes to style. */
 256         int line;
 257         int foldLevelNow;
 258         int foldLevelPrev;
 259
 260         DocModification(int modificationType_, int position_=0, int length_=0,
 261                 int linesAdded_=0, const char *text_=0) :
 262                 modificationType(modificationType_),
 263                 position(position_),
 264                 length(length_),
 265                 linesAdded(linesAdded_),
 266                 text(text_),
 267                 line(0),
 268                 foldLevelNow(0),
 269                 foldLevelPrev(0) {}
 270
 271     DocModification(int modificationType_, const Action &act, int linesAdded_=0) :
 272                 modificationType(modificationType_),
 273                 position(act.position / 2),
 274                 length(act.lenData),
 275                 linesAdded(linesAdded_),
 276                 text(act.data),
 277                 line(0),
 278                 foldLevelNow(0),
 279                 foldLevelPrev(0) {}
 280 };
 281
 282 /**
 283  * A class that wants to receive notifications from a Document must be derived from DocWatcher
 284  * and implement the notification methods. It can then be added to the watcher list with AddWatcher.
 285  */
 286 class DocWatcher {
 287 public:
 288         virtual ~DocWatcher() {}
 289
 290         virtual void NotifyModifyAttempt(Document *doc, void *userData) = 0;
 291         virtual void NotifySavePoint(Document *doc, void *userData, bool atSavePoint) = 0;
 292         virtual void NotifyModified(Document *doc, DocModification mh, void *userData) = 0;
 293         virtual void NotifyDeleted(Document *doc, void *userData) = 0;
 294         virtual void NotifyStyleNeeded(Document *doc, void *userData, int endPos) = 0;
 295 };
 296
 297 #endif