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 #if PLAT_WIN
  27 bool DocumentAccessor::InternalIsLeadByte(char ch) {
  28         if (SC_CP_UTF8 == codePage)
  29                 // For lexing, all characters >= 0x80 are treated the
  30                 // same so none is considered a lead byte.
  31                 return false;
  32         else
  33                 return IsDBCSLeadByteEx(codePage, ch);
  34 }
  35 #else
  36 // PLAT_GTK or PLAT_WX
  37 // TODO: support DBCS under GTK+ and WX
  38 bool DocumentAccessor::InternalIsLeadByte(char) {
  39         return false;
  40 }
  41 #endif
  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 char DocumentAccessor::StyleAt(int position) {
  60         return pdoc->StyleAt(position);
  61 }
  62
  63 int DocumentAccessor::GetLine(int position) {
  64         return pdoc->LineFromPosition(position);
  65 }
  66
  67 int DocumentAccessor::LineStart(int line) {
  68         return pdoc->LineStart(line);
  69 }
  70
  71 int DocumentAccessor::LevelAt(int line) {
  72         return pdoc->GetLevel(line);
  73 }
  74
  75 int DocumentAccessor::Length() {
  76         if (lenDoc == -1)
  77                 lenDoc = pdoc->Length();
  78         return lenDoc;
  79 }
  80
  81 int DocumentAccessor::GetLineState(int line) {
  82         return pdoc->GetLineState(line);
  83 }
  84
  85 int DocumentAccessor::SetLineState(int line, int state) {
  86         return pdoc->SetLineState(line, state);
  87 }
  88
  89 void DocumentAccessor::StartAt(unsigned int start, char chMask) {
  90         pdoc->StartStyling(start, chMask);
  91 }
  92
  93 void DocumentAccessor::StartSegment(unsigned int pos) {
  94         startSeg = pos;
  95 }
  96
  97 void DocumentAccessor::ColourTo(unsigned int pos, int chAttr) {
  98         // Only perform styling if non empty range
  99         if (pos != startSeg - 1) {
 100                 if (pos < startSeg) {
 101                         Platform::DebugPrintf("Bad colour positions %d - %d\n", startSeg, pos);
 102                 }
 103
 104                 if (validLen + (pos - startSeg + 1) >= bufferSize)
 105                         Flush();
 106                 if (validLen + (pos - startSeg + 1) >= bufferSize) {
 107                         // Too big for buffer so send directly
 108                         pdoc->SetStyleFor(pos - startSeg + 1, static_cast<char>(chAttr));
 109                 } else {
 110                         if (chAttr != chWhile)
 111                                 chFlags = 0;
 112                         chAttr |= chFlags;
 113                         for (unsigned int i = startSeg; i <= pos; i++) {
 114                                 styleBuf[validLen++] = static_cast<char>(chAttr);
 115                         }
 116                 }
 117         }
 118         startSeg = pos+1;
 119 }
 120
 121 void DocumentAccessor::SetLevel(int line, int level) {
 122         pdoc->SetLevel(line, level);
 123 }
 124
 125 void DocumentAccessor::Flush() {
 126         startPos = extremePosition;
 127         lenDoc = -1;
 128         if (validLen > 0) {
 129                 pdoc->SetStyles(validLen, styleBuf);
 130                 validLen = 0;
 131         }
 132 }
 133
 134 int DocumentAccessor::IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader) {
 135         int end = Length();
 136         int spaceFlags = 0;
 137
 138         // Determines the indentation level of the current line and also checks for consistent
 139         // indentation compared to the previous line.
 140         // Indentation is judged consistent when the indentation whitespace of each line lines
 141         // the same or the indentation of one line is a prefix of the other.
 142
 143         int pos = LineStart(line);
 144         char ch = (*this)[pos];
 145         int indent = 0;
 146         bool inPrevPrefix = line > 0;
 147         int posPrev = inPrevPrefix ? LineStart(line-1) : 0;
 148         while ((ch == ' ' || ch == '\t') && (pos < end)) {
 149                 if (inPrevPrefix) {
 150                         char chPrev = (*this)[posPrev++];
 151                         if (chPrev == ' ' || chPrev == '\t') {
 152                                 if (chPrev != ch)
 153                                         spaceFlags |= wsInconsistent;
 154                         } else {
 155                                 inPrevPrefix = false;
 156                         }
 157                 }
 158                 if (ch == ' ') {
 159                         spaceFlags |= wsSpace;
 160                         indent++;
 161                 } else {        // Tab
 162                         spaceFlags |= wsTab;
 163                         if (spaceFlags & wsSpace)
 164                                 spaceFlags |= wsSpaceTab;
 165                         indent = (indent / 8 + 1) * 8;
 166                 }
 167                 ch = (*this)[++pos];
 168         }
 169
 170         *flags = spaceFlags;
 171         indent += SC_FOLDLEVELBASE;
 172         // if completely empty line or the start of a comment...
 173         if ((ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') ||
 174                 (pfnIsCommentLeader && (*pfnIsCommentLeader)(*this, pos, end-pos)) )
 175                 return indent | SC_FOLDLEVELWHITEFLAG;
 176         else
 177                 return indent;
 178 }
 179