src/stc/scintilla/src/DocumentAccessor.cxx

   1 // SciTE - Scintilla based Text Editor
   2 // Accessor.cxx - rapid easy access to contents of a Scintilla
   3 // Copyright 1998-2000 by Neil Hodgson <neilh@scintilla.org>
   4 // The License.txt file describes the conditions under which this software may be distributed.
   5
   6 #include <stdlib.h>
   7 #include <ctype.h>
   8 #include <stdio.h>
   9
  10 #include "Platform.h"
  11
  12 #include "PropSet.h"
  13 #include "SVector.h"
  14 #include "Accessor.h"
  15 #include "DocumentAccessor.h"
  16 #include "CellBuffer.h"
  17 #include "Scintilla.h"
  18 #include "Document.h"
  19
  20 DocumentAccessor::~DocumentAccessor() {
  21 }
  22
  23 bool DocumentAccessor::InternalIsLeadByte(char ch) {
  24 #if PLAT_GTK
  25         // TODO: support DBCS under GTK+
  26         return false;
  27 #elif PLAT_WIN
  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 #elif PLAT_WX
  35         return false;
  36 #endif
  37 }
  38
  39 void DocumentAccessor::Fill(int position) {
  40         if (lenDoc == -1)
  41                 lenDoc = pdoc->Length();
  42         startPos = position - slopSize;
  43         if (startPos + bufferSize > lenDoc)
  44                 startPos = lenDoc - bufferSize;
  45         if (startPos < 0)
  46                 startPos = 0;
  47         endPos = startPos + bufferSize;
  48         if (endPos > lenDoc)
  49                 endPos = lenDoc;
  50
  51         pdoc->GetCharRange(buf, startPos, endPos-startPos);
  52         buf[endPos-startPos] = '\0';
  53 }
  54
  55 char DocumentAccessor::StyleAt(int position) {
  56         return pdoc->StyleAt(position);
  57 }
  58
  59 int DocumentAccessor::GetLine(int position) {
  60         return pdoc->LineFromPosition(position);
  61 }
  62
  63 int DocumentAccessor::LineStart(int line) {
  64         return pdoc->LineStart(line);
  65 }
  66
  67 int DocumentAccessor::LevelAt(int line) {
  68         return pdoc->GetLevel(line);
  69 }
  70
  71 int DocumentAccessor::Length() {
  72         if (lenDoc == -1)
  73                 lenDoc = pdoc->Length();
  74         return lenDoc;
  75 }
  76
  77 int DocumentAccessor::GetLineState(int line) {
  78         return pdoc->GetLineState(line);
  79 }
  80
  81 int DocumentAccessor::SetLineState(int line, int state) {
  82         return pdoc->SetLineState(line, state);
  83 }
  84
  85 void DocumentAccessor::StartAt(unsigned int start, char chMask) {
  86         pdoc->StartStyling(start, chMask);
  87 }
  88
  89 void DocumentAccessor::StartSegment(unsigned int pos) {
  90         startSeg = pos;
  91 }
  92
  93 void DocumentAccessor::ColourTo(unsigned int pos, int chAttr) {
  94         // Only perform styling if non empty range
  95         if (pos != startSeg - 1) {
  96                 if (pos < startSeg) {
  97                         Platform::DebugPrintf("Bad colour positions %d - %d\n", startSeg, pos);
  98                 }
  99
 100                 if (validLen + (pos - startSeg + 1) >= bufferSize)
 101                         Flush();
 102                 if (validLen + (pos - startSeg + 1) >= bufferSize) {
 103                         // Too big for buffer so send directly
 104                         pdoc->SetStyleFor(pos - startSeg + 1, static_cast<char>(chAttr));
 105                 } else {
 106                         if (chAttr != chWhile)
 107                                 chFlags = 0;
 108                         chAttr |= chFlags;
 109                         for (unsigned int i = startSeg; i <= pos; i++) {
 110                                 styleBuf[validLen++] = static_cast<char>(chAttr);
 111                         }
 112                 }
 113         }
 114         startSeg = pos+1;
 115 }
 116
 117 void DocumentAccessor::SetLevel(int line, int level) {
 118         pdoc->SetLevel(line, level);
 119 }
 120
 121 void DocumentAccessor::Flush() {
 122         startPos = extremePosition;
 123         lenDoc = -1;
 124         if (validLen > 0) {
 125                 pdoc->SetStyles(validLen, styleBuf);
 126                 validLen = 0;
 127         }
 128 }
 129
 130 int DocumentAccessor::IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader) {
 131         int end = Length();
 132         int spaceFlags = 0;
 133
 134         // Determines the indentation level of the current line and also checks for consistent
 135         // indentation compared to the previous line.
 136         // Indentation is judged consistent when the indentation whitespace of each line lines
 137         // the same or the indentation of one line is a prefix of the other.
 138
 139         int pos = LineStart(line);
 140         char ch = (*this)[pos];
 141         int indent = 0;
 142         bool inPrevPrefix = line > 0;
 143         int posPrev = inPrevPrefix ? LineStart(line-1) : 0;
 144         while ((ch == ' ' || ch == '\t') && (pos < end)) {
 145                 if (inPrevPrefix) {
 146                         char chPrev = (*this)[posPrev++];
 147                         if (chPrev == ' ' || chPrev == '\t') {
 148                                 if (chPrev != ch)
 149                                         spaceFlags |= wsInconsistent;
 150                         } else {
 151                                 inPrevPrefix = false;
 152                         }
 153                 }
 154                 if (ch == ' ') {
 155                         spaceFlags |= wsSpace;
 156                         indent++;
 157                 } else {        // Tab
 158                         spaceFlags |= wsTab;
 159                         if (spaceFlags & wsSpace)
 160                                 spaceFlags |= wsSpaceTab;
 161                         indent = (indent / 8 + 1) * 8;
 162                 }
 163                 ch = (*this)[++pos];
 164         }
 165
 166         *flags = spaceFlags;
 167         indent += SC_FOLDLEVELBASE;
 168         // if completely empty line or the start of a comment...
 169         if (isspace(ch) || (pfnIsCommentLeader && (*pfnIsCommentLeader)(*this, pos, end-pos)) )
 170                 return indent | SC_FOLDLEVELWHITEFLAG;
 171         else
 172                 return indent;
 173 }
 174