src/stc/scintilla/src/DocumentAccessor.cxx

   1 // Scintilla source code edit control
   2 /** @file DocumentAccessor.cxx
   3  ** Rapid easy access to contents of a Scintilla.
   4  **/
   5 // Copyright 1998-2001 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 #include <string.h>
  10 #include <ctype.h>
  11 #include <stdio.h>
  12
  13 #include "Platform.h"
  14
  15 #include "PropSet.h"
  16 #include "Accessor.h"
  17 #include "DocumentAccessor.h"
  18 #include "SplitVector.h"
  19 #include "Partitioning.h"
  20 #include "RunStyles.h"
  21 #include "CellBuffer.h"
  22 #include "Scintilla.h"
  23 #include "CharClassify.h"
  24 #include "Decoration.h"
  25 #include "Document.h"
  26
  27 #ifdef SCI_NAMESPACE
  28 using namespace Scintilla;
  29 #endif
  30
  31 DocumentAccessor::~DocumentAccessor() {
  32 }
  33
  34 bool DocumentAccessor::InternalIsLeadByte(char ch) {
  35         if (SC_CP_UTF8 == codePage)
  36                 // For lexing, all characters >= 0x80 are treated the
  37                 // same so none is considered a lead byte.
  38                 return false;
  39         else
  40                 return Platform::IsDBCSLeadByte(codePage, ch);
  41 }
  42
  43 void DocumentAccessor::Fill(int position) {
  44         if (lenDoc == -1)
  45                 lenDoc = pdoc->Length();
  46         startPos = position - slopSize;
  47         if (startPos + bufferSize > lenDoc)
  48                 startPos = lenDoc - bufferSize;
  49         if (startPos < 0)
  50                 startPos = 0;
  51         endPos = startPos + bufferSize;
  52         if (endPos > lenDoc)
  53                 endPos = lenDoc;
  54
  55         pdoc->GetCharRange(buf, startPos, endPos-startPos);
  56         buf[endPos-startPos] = '\0';
  57 }
  58
  59 bool DocumentAccessor::Match(int pos, const char *s) {
  60         for (int i=0; *s; i++) {
  61                 if (*s != SafeGetCharAt(pos+i))
  62                         return false;
  63                 s++;
  64         }
  65         return true;
  66 }
  67
  68 char DocumentAccessor::StyleAt(int position) {
  69         // Mask off all bits which aren't in the 'mask'.
  70         return static_cast<char>(pdoc->StyleAt(position) & mask);
  71 }
  72
  73 int DocumentAccessor::GetLine(int position) {
  74         return pdoc->LineFromPosition(position);
  75 }
  76
  77 int DocumentAccessor::LineStart(int line) {
  78         return pdoc->LineStart(line);
  79 }
  80
  81 int DocumentAccessor::LevelAt(int line) {
  82         return pdoc->GetLevel(line);
  83 }
  84
  85 int DocumentAccessor::Length() {
  86         if (lenDoc == -1)
  87                 lenDoc = pdoc->Length();
  88         return lenDoc;
  89 }
  90
  91 int DocumentAccessor::GetLineState(int line) {
  92         return pdoc->GetLineState(line);
  93 }
  94
  95 int DocumentAccessor::SetLineState(int line, int state) {
  96         return pdoc->SetLineState(line, state);
  97 }
  98
  99 void DocumentAccessor::StartAt(unsigned int start, char chMask) {
 100         // Store the mask specified for use with StyleAt.
 101         mask = chMask;
 102         pdoc->StartStyling(start, chMask);
 103         startPosStyling = start;
 104 }
 105
 106 void DocumentAccessor::StartSegment(unsigned int pos) {
 107         startSeg = pos;
 108 }
 109
 110 void DocumentAccessor::ColourTo(unsigned int pos, int chAttr) {
 111         // Only perform styling if non empty range
 112         if (pos != startSeg - 1) {
 113                 PLATFORM_ASSERT(pos >= startSeg);
 114                 if (pos < startSeg) {
 115                         return;
 116                 }
 117
 118                 if (validLen + (pos - startSeg + 1) >= bufferSize)
 119                         Flush();
 120                 if (validLen + (pos - startSeg + 1) >= bufferSize) {
 121                         // Too big for buffer so send directly
 122                         pdoc->SetStyleFor(pos - startSeg + 1, static_cast<char>(chAttr));
 123                 } else {
 124                         if (chAttr != chWhile)
 125                                 chFlags = 0;
 126                         chAttr |= chFlags;
 127                         for (unsigned int i = startSeg; i <= pos; i++) {
 128                                 PLATFORM_ASSERT((startPosStyling + validLen) < Length());
 129                                 styleBuf[validLen++] = static_cast<char>(chAttr);
 130                         }
 131                 }
 132         }
 133         startSeg = pos+1;
 134 }
 135
 136 void DocumentAccessor::SetLevel(int line, int level) {
 137         pdoc->SetLevel(line, level);
 138 }
 139
 140 void DocumentAccessor::Flush() {
 141         startPos = extremePosition;
 142         lenDoc = -1;
 143         if (validLen > 0) {
 144                 pdoc->SetStyles(validLen, styleBuf);
 145                 startPosStyling += validLen;
 146                 validLen = 0;
 147         }
 148 }
 149
 150 int DocumentAccessor::IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader) {
 151         int end = Length();
 152         int spaceFlags = 0;
 153
 154         // Determines the indentation level of the current line and also checks for consistent
 155         // indentation compared to the previous line.
 156         // Indentation is judged consistent when the indentation whitespace of each line lines
 157         // the same or the indentation of one line is a prefix of the other.
 158
 159         int pos = LineStart(line);
 160         char ch = (*this)[pos];
 161         int indent = 0;
 162         bool inPrevPrefix = line > 0;
 163         int posPrev = inPrevPrefix ? LineStart(line-1) : 0;
 164         while ((ch == ' ' || ch == '\t') && (pos < end)) {
 165                 if (inPrevPrefix) {
 166                         char chPrev = (*this)[posPrev++];
 167                         if (chPrev == ' ' || chPrev == '\t') {
 168                                 if (chPrev != ch)
 169                                         spaceFlags |= wsInconsistent;
 170                         } else {
 171                                 inPrevPrefix = false;
 172                         }
 173                 }
 174                 if (ch == ' ') {
 175                         spaceFlags |= wsSpace;
 176                         indent++;
 177                 } else {        // Tab
 178                         spaceFlags |= wsTab;
 179                         if (spaceFlags & wsSpace)
 180                                 spaceFlags |= wsSpaceTab;
 181                         indent = (indent / 8 + 1) * 8;
 182                 }
 183                 ch = (*this)[++pos];
 184         }
 185
 186         *flags = spaceFlags;
 187         indent += SC_FOLDLEVELBASE;
 188         // if completely empty line or the start of a comment...
 189         if ((ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') ||
 190                 (pfnIsCommentLeader && (*pfnIsCommentLeader)(*this, pos, end-pos)) )
 191                 return indent | SC_FOLDLEVELWHITEFLAG;
 192         else
 193                 return indent;
 194 }
 195
 196 void DocumentAccessor::IndicatorFill(int start, int end, int indicator, int value) {
 197         pdoc->decorations.SetCurrentIndicator(indicator);
 198         pdoc->DecorationFillRange(start, value, end - start);
 199 }