scintilla/Selection.cxx

   1 // Scintilla source code edit control
   2 /** @file Selection.cxx
   3  ** Classes maintaining the selection.
   4  **/
   5 // Copyright 2009 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <stdlib.h>
   9
  10 #include <vector>
  11
  12 #include "Platform.h"
  13
  14 #include "Scintilla.h"
  15
  16 #include "Selection.h"
  17
  18 #ifdef SCI_NAMESPACE
  19 using namespace Scintilla;
  20 #endif
  21
  22 void SelectionPosition::MoveForInsertDelete(bool insertion, int startChange, int length) {
  23         if (insertion) {
  24                 if (position > startChange) {
  25                         position += length;
  26                 }
  27         } else {
  28                 if (position > startChange) {
  29                         int endDeletion = startChange + length;
  30                         if (position > endDeletion) {
  31                                 position -= length;
  32                         } else {
  33                                 position = startChange;
  34                         }
  35                 }
  36         }
  37 }
  38
  39 bool SelectionPosition::operator <(const SelectionPosition &other) const {
  40         if (position == other.position)
  41                 return virtualSpace < other.virtualSpace;
  42         else
  43                 return position < other.position;
  44 }
  45
  46 bool SelectionPosition::operator >(const SelectionPosition &other) const {
  47         if (position == other.position)
  48                 return virtualSpace > other.virtualSpace;
  49         else
  50                 return position > other.position;
  51 }
  52
  53 bool SelectionPosition::operator <=(const SelectionPosition &other) const {
  54         if (position == other.position && virtualSpace == other.virtualSpace)
  55                 return true;
  56         else
  57                 return other > *this;
  58 }
  59
  60 bool SelectionPosition::operator >=(const SelectionPosition &other) const {
  61         if (position == other.position && virtualSpace == other.virtualSpace)
  62                 return true;
  63         else
  64                 return *this > other;
  65 }
  66
  67 int SelectionRange::Length() const {
  68         if (anchor > caret) {
  69                 return anchor.Position() - caret.Position();
  70         } else {
  71                 return caret.Position() - anchor.Position();
  72         }
  73 }
  74
  75 bool SelectionRange::Contains(int pos) const {
  76         if (anchor > caret)
  77                 return (pos >= caret.Position()) && (pos <= anchor.Position());
  78         else
  79                 return (pos >= anchor.Position()) && (pos <= caret.Position());
  80 }
  81
  82 bool SelectionRange::Contains(SelectionPosition sp) const {
  83         if (anchor > caret)
  84                 return (sp >= caret) && (sp <= anchor);
  85         else
  86                 return (sp >= anchor) && (sp <= caret);
  87 }
  88
  89 bool SelectionRange::ContainsCharacter(int posCharacter) const {
  90         if (anchor > caret)
  91                 return (posCharacter >= caret.Position()) && (posCharacter < anchor.Position());
  92         else
  93                 return (posCharacter >= anchor.Position()) && (posCharacter < caret.Position());
  94 }
  95
  96 SelectionSegment SelectionRange::Intersect(SelectionSegment check) const {
  97         SelectionSegment inOrder(caret, anchor);
  98         if ((inOrder.start <= check.end) || (inOrder.end >= check.start)) {
  99                 SelectionSegment portion = check;
 100                 if (portion.start < inOrder.start)
 101                         portion.start = inOrder.start;
 102                 if (portion.end > inOrder.end)
 103                         portion.end = inOrder.end;
 104                 if (portion.start > portion.end)
 105                         return SelectionSegment();
 106                 else
 107                         return portion;
 108         } else {
 109                 return SelectionSegment();
 110         }
 111 }
 112
 113 bool SelectionRange::Trim(SelectionRange range) {
 114         SelectionPosition startRange = range.Start();
 115         SelectionPosition endRange = range.End();
 116         SelectionPosition start = Start();
 117         SelectionPosition end = End();
 118         PLATFORM_ASSERT(start <= end);
 119         PLATFORM_ASSERT(startRange <= endRange);
 120         if ((startRange <= end) && (endRange >= start)) {
 121                 if ((start > startRange) && (end < endRange)) {
 122                         // Completely covered by range -> empty at start
 123                         end = start;
 124                 } else if ((start < startRange) && (end > endRange)) {
 125                         // Completely covers range -> empty at start
 126                         end = start;
 127                 } else if (start <= startRange) {
 128                         // Trim end
 129                         end = startRange;
 130                 } else { //
 131                         PLATFORM_ASSERT(end >= endRange);
 132                         // Trim start
 133                         start = endRange;
 134                 }
 135                 if (anchor > caret) {
 136                         caret = start;
 137                         anchor = end;
 138                 } else {
 139                         anchor = start;
 140                         caret = end;
 141                 }
 142                 return Empty();
 143         } else {
 144                 return false;
 145         }
 146 }
 147
 148 // If range is all virtual collapse to start of virtual space
 149 void SelectionRange::MinimizeVirtualSpace() {
 150         if (caret.Position() == anchor.Position()) {
 151                 int virtualSpace = caret.VirtualSpace();
 152                 if (virtualSpace > anchor.VirtualSpace())
 153                         virtualSpace = anchor.VirtualSpace();
 154                 caret.SetVirtualSpace(virtualSpace);
 155                 anchor.SetVirtualSpace(virtualSpace);
 156         }
 157 }
 158
 159 Selection::Selection() : mainRange(0), moveExtends(false), tentativeMain(false), selType(selStream) {
 160         AddSelection(SelectionPosition(0));
 161 }
 162
 163 Selection::~Selection() {
 164 }
 165
 166 bool Selection::IsRectangular() const {
 167         return (selType == selRectangle) || (selType == selThin);
 168 }
 169
 170 int Selection::MainCaret() const {
 171         return ranges[mainRange].caret.Position();
 172 }
 173
 174 int Selection::MainAnchor() const {
 175         return ranges[mainRange].anchor.Position();
 176 }
 177
 178 SelectionRange &Selection::Rectangular() {
 179         return rangeRectangular;
 180 }
 181
 182 SelectionSegment Selection::Limits() const {
 183         if (ranges.empty()) {
 184                 return SelectionSegment();
 185         } else {
 186                 SelectionSegment sr(ranges[0].anchor, ranges[0].caret);
 187                 for (size_t i=1; i<ranges.size(); i++) {
 188                         sr.Extend(ranges[i].anchor);
 189                         sr.Extend(ranges[i].caret);
 190                 }
 191                 return sr;
 192         }
 193 }
 194
 195 SelectionSegment Selection::LimitsForRectangularElseMain() const {
 196         if (IsRectangular()) {
 197                 return Limits();
 198         } else {
 199                 return SelectionSegment(ranges[mainRange].caret, ranges[mainRange].anchor);
 200         }
 201 }
 202
 203 size_t Selection::Count() const {
 204         return ranges.size();
 205 }
 206
 207 size_t Selection::Main() const {
 208         return mainRange;
 209 }
 210
 211 void Selection::SetMain(size_t r) {
 212         PLATFORM_ASSERT(r < ranges.size());
 213         mainRange = r;
 214 }
 215
 216 SelectionRange &Selection::Range(size_t r) {
 217         return ranges[r];
 218 }
 219
 220 SelectionRange &Selection::RangeMain() {
 221         return ranges[mainRange];
 222 }
 223
 224 bool Selection::MoveExtends() const {
 225         return moveExtends;
 226 }
 227
 228 void Selection::SetMoveExtends(bool moveExtends_) {
 229         moveExtends = moveExtends_;
 230 }
 231
 232 bool Selection::Empty() const {
 233         for (size_t i=0; i<ranges.size(); i++) {
 234                 if (!ranges[i].Empty())
 235                         return false;
 236         }
 237         return true;
 238 }
 239
 240 SelectionPosition Selection::Last() const {
 241         SelectionPosition lastPosition;
 242         for (size_t i=0; i<ranges.size(); i++) {
 243                 if (lastPosition < ranges[i].caret)
 244                         lastPosition = ranges[i].caret;
 245                 if (lastPosition < ranges[i].anchor)
 246                         lastPosition = ranges[i].anchor;
 247         }
 248         return lastPosition;
 249 }
 250
 251 int Selection::Length() const {
 252         int len = 0;
 253         for (size_t i=0; i<ranges.size(); i++) {
 254                 len += ranges[i].Length();
 255         }
 256         return len;
 257 }
 258
 259 void Selection::MovePositions(bool insertion, int startChange, int length) {
 260         for (size_t i=0; i<ranges.size(); i++) {
 261                 ranges[i].caret.MoveForInsertDelete(insertion, startChange, length);
 262                 ranges[i].anchor.MoveForInsertDelete(insertion, startChange, length);
 263         }
 264 }
 265
 266 void Selection::TrimSelection(SelectionRange range) {
 267         for (size_t i=0; i<ranges.size();) {
 268                 if ((i != mainRange) && (ranges[i].Trim(range))) {
 269                         // Trimmed to empty so remove
 270                         for (size_t j=i;j<ranges.size()-1;j++) {
 271                                 ranges[j] = ranges[j+1];
 272                                 if (j == mainRange-1)
 273                                         mainRange--;
 274                         }
 275                         ranges.pop_back();
 276                 } else {
 277                         i++;
 278                 }
 279         }
 280 }
 281
 282 void Selection::SetSelection(SelectionRange range) {
 283         ranges.clear();
 284         ranges.push_back(range);
 285         mainRange = ranges.size() - 1;
 286 }
 287
 288 void Selection::AddSelection(SelectionRange range) {
 289         TrimSelection(range);
 290         ranges.push_back(range);
 291         mainRange = ranges.size() - 1;
 292 }
 293
 294 void Selection::TentativeSelection(SelectionRange range) {
 295         if (!tentativeMain) {
 296                 rangesSaved = ranges;
 297         }
 298         ranges = rangesSaved;
 299         AddSelection(range);
 300         TrimSelection(ranges[mainRange]);
 301         tentativeMain = true;
 302 }
 303
 304 void Selection::CommitTentative() {
 305         rangesSaved.clear();
 306         tentativeMain = false;
 307 }
 308
 309 int Selection::CharacterInSelection(int posCharacter) const {
 310         for (size_t i=0; i<ranges.size(); i++) {
 311                 if (ranges[i].ContainsCharacter(posCharacter))
 312                         return i == mainRange ? 1 : 2;
 313         }
 314         return 0;
 315 }
 316
 317 int Selection::InSelectionForEOL(int pos) const {
 318         for (size_t i=0; i<ranges.size(); i++) {
 319                 if (!ranges[i].Empty() && (pos > ranges[i].Start().Position()) && (pos <= ranges[i].End().Position()))
 320                         return i == mainRange ? 1 : 2;
 321         }
 322         return 0;
 323 }
 324
 325 int Selection::VirtualSpaceFor(int pos) const {
 326         int virtualSpace = 0;
 327         for (size_t i=0; i<ranges.size(); i++) {
 328                 if ((ranges[i].caret.Position() == pos) && (virtualSpace < ranges[i].caret.VirtualSpace()))
 329                         virtualSpace = ranges[i].caret.VirtualSpace();
 330                 if ((ranges[i].anchor.Position() == pos) && (virtualSpace < ranges[i].anchor.VirtualSpace()))
 331                         virtualSpace = ranges[i].anchor.VirtualSpace();
 332         }
 333         return virtualSpace;
 334 }
 335
 336 void Selection::Clear() {
 337         ranges.clear();
 338         ranges.push_back(SelectionRange());
 339         mainRange = ranges.size() - 1;
 340         selType = selStream;
 341         moveExtends = false;
 342         ranges[mainRange].Reset();
 343         rangeRectangular.Reset();
 344 }
 345
 346 void Selection::RemoveDuplicates() {
 347         for (size_t i=0; i<ranges.size()-1; i++) {
 348                 if (ranges[i].Empty()) {
 349                         size_t j=i+1;
 350                         while (j<ranges.size()) {
 351                                 if (ranges[i] == ranges[j]) {
 352                                         ranges.erase(ranges.begin() + j);
 353                                         if (mainRange >= j)
 354                                                 mainRange--;
 355                                 } else {
 356                                         j++;
 357                                 }
 358                         }
 359                 }
 360         }
 361 }
 362
 363 void Selection::RotateMain() {
 364         mainRange = (mainRange + 1) % ranges.size();
 365 }
 366