contrib/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 "SVector.h"
  17 #include "Accessor.h"
  18 #include "DocumentAccessor.h"
  19 #include "CellBuffer.h"
  20 #include "Scintilla.h"
  21 #include "Document.h"
  22
  23 DocumentAccessor::~DocumentAccessor() {
  24 }
  25
  26 bool DocumentAccessor::InternalIsLeadByte(char ch) {
  27         if (SC_CP_UTF8 == codePage)
  28                 // For lexing, all characters >= 0x80 are treated the
  29                 // same so none is considered a lead byte.
  30                 return false;
  31         else
  32                 return Platform::IsDBCSLeadByte(codePage, ch);
  33 }
  34
  35 void DocumentAccessor::Fill(int position) {
  36         if (lenDoc == -1)
  37                 lenDoc = pdoc->Length();
  38         startPos = position - slopSize;
  39         if (startPos + bufferSize > lenDoc)
  40                 startPos = lenDoc - bufferSize;
  41         if (startPos < 0)
  42                 startPos = 0;
  43         endPos = startPos + bufferSize;
  44         if (endPos > lenDoc)
  45                 endPos = lenDoc;
  46
  47         pdoc->GetCharRange(buf, startPos, endPos-startPos);
  48         buf[endPos-startPos] = '\0';
  49 }
  50
  51 char DocumentAccessor::StyleAt(int position) {
  52         return pdoc->StyleAt(position);
  53 }
  54
  55 int DocumentAccessor::GetLine(int position) {
  56         return pdoc->LineFromPosition(position);
  57 }
  58
  59 int DocumentAccessor::LineStart(int line) {
  60         return pdoc->LineStart(line);
  61 }
  62
  63 int DocumentAccessor::LevelAt(int line) {
  64         return pdoc->GetLevel(line);
  65 }
  66
  67 int DocumentAccessor::Length() {
  68         if (lenDoc == -1)
  69                 lenDoc = pdoc->Length();
  70         return lenDoc;
  71 }
  72
  73 int DocumentAccessor::GetLineState(int line) {
  74         return pdoc->GetLineState(line);
  75 }
  76
  77 int DocumentAccessor::SetLineState(int line, int state) {
  78         return pdoc->SetLineState(line, state);
  79 }
  80
  81 void DocumentAccessor::StartAt(unsigned int start, char chMask) {
  82         pdoc->StartStyling(start, chMask);
  83         startPosStyling = start;
  84 }
  85
  86 void DocumentAccessor::StartSegment(unsigned int pos) {
  87         startSeg = pos;
  88 }
  89
  90 void DocumentAccessor::ColourTo(unsigned int pos, int chAttr) {
  91         // Only perform styling if non empty range
  92         if (pos != startSeg - 1) {
  93                 if (pos < startSeg) {
  94                         Platform::DebugPrintf("Bad colour positions %d - %d\n", startSeg, pos);
  95                 }
  96
  97                 if (validLen + (pos - startSeg + 1) >= bufferSize)
  98                         Flush();
  99                 if (validLen + (pos - startSeg + 1) >= bufferSize) {
 100                         // Too big for buffer so send directly
 101                         pdoc->SetStyleFor(pos - startSeg + 1, static_cast<char>(chAttr));
 102                 } else {
 103                         if (chAttr != chWhile)
 104                                 chFlags = 0;
 105                         chAttr |= chFlags;
 106                         for (unsigned int i = startSeg; i <= pos; i++) {
 107                                 PLATFORM_ASSERT((startPosStyling + validLen) < Length());
 108                                 styleBuf[validLen++] = static_cast<char>(chAttr);
 109                         }
 110                 }
 111         }
 112         startSeg = pos+1;
 113 }
 114
 115 void DocumentAccessor::SetLevel(int line, int level) {
 116         pdoc->SetLevel(line, level);
 117 }
 118
 119 void DocumentAccessor::Flush() {
 120         startPos = extremePosition;
 121         lenDoc = -1;
 122         if (validLen > 0) {
 123                 pdoc->SetStyles(validLen, styleBuf);
 124                 validLen = 0;
 125                 startPosStyling += validLen;
 126         }
 127 }
 128
 129 int DocumentAccessor::IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader) {
 130         int end = Length();
 131         int spaceFlags = 0;
 132
 133         // Determines the indentation level of the current line and also checks for consistent
 134         // indentation compared to the previous line.
 135         // Indentation is judged consistent when the indentation whitespace of each line lines
 136         // the same or the indentation of one line is a prefix of the other.
 137
 138         int pos = LineStart(line);
 139         char ch = (*this)[pos];
 140         int indent = 0;
 141         bool inPrevPrefix = line > 0;
 142         int posPrev = inPrevPrefix ? LineStart(line-1) : 0;
 143         while ((ch == ' ' || ch == '\t') && (pos < end)) {
 144                 if (inPrevPrefix) {
 145                         char chPrev = (*this)[posPrev++];
 146                         if (chPrev == ' ' || chPrev == '\t') {
 147                                 if (chPrev != ch)
 148                                         spaceFlags |= wsInconsistent;
 149                         } else {
 150                                 inPrevPrefix = false;
 151                         }
 152                 }
 153                 if (ch == ' ') {
 154                         spaceFlags |= wsSpace;
 155                         indent++;
 156                 } else {        // Tab
 157                         spaceFlags |= wsTab;
 158                         if (spaceFlags & wsSpace)
 159                                 spaceFlags |= wsSpaceTab;
 160                         indent = (indent / 8 + 1) * 8;
 161                 }
 162                 ch = (*this)[++pos];
 163         }
 164
 165         *flags = spaceFlags;
 166         indent += SC_FOLDLEVELBASE;
 167         // if completely empty line or the start of a comment...
 168         if ((ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') ||
 169                 (pfnIsCommentLeader && (*pfnIsCommentLeader)(*this, pos, end-pos)) )
 170                 return indent | SC_FOLDLEVELWHITEFLAG;
 171         else
 172                 return indent;
 173 }
 174