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 bool DocumentAccessor::Match(int pos, const char *s) {
  52         for (int i=0; *s; i++) {
  53                 if (*s != SafeGetCharAt(pos+i))
  54                         return false;
  55                 s++;
  56         }
  57         return true;
  58 }
  59
  60 char DocumentAccessor::StyleAt(int position) {
  61         return pdoc->StyleAt(position);
  62 }
  63
  64 int DocumentAccessor::GetLine(int position) {
  65         return pdoc->LineFromPosition(position);
  66 }
  67
  68 int DocumentAccessor::LineStart(int line) {
  69         return pdoc->LineStart(line);
  70 }
  71
  72 int DocumentAccessor::LevelAt(int line) {
  73         return pdoc->GetLevel(line);
  74 }
  75
  76 int DocumentAccessor::Length() {
  77         if (lenDoc == -1)
  78                 lenDoc = pdoc->Length();
  79         return lenDoc;
  80 }
  81
  82 int DocumentAccessor::GetLineState(int line) {
  83         return pdoc->GetLineState(line);
  84 }
  85
  86 int DocumentAccessor::SetLineState(int line, int state) {
  87         return pdoc->SetLineState(line, state);
  88 }
  89
  90 void DocumentAccessor::StartAt(unsigned int start, char chMask) {
  91         pdoc->StartStyling(start, chMask);
  92         startPosStyling = start;
  93 }
  94
  95 void DocumentAccessor::StartSegment(unsigned int pos) {
  96         startSeg = pos;
  97 }
  98
  99 void DocumentAccessor::ColourTo(unsigned int pos, int chAttr) {
 100         // Only perform styling if non empty range
 101         if (pos != startSeg - 1) {
 102                 if (pos < startSeg) {
 103                         Platform::DebugPrintf("Bad colour positions %d - %d\n", startSeg, pos);
 104                 }
 105
 106                 if (validLen + (pos - startSeg + 1) >= bufferSize)
 107                         Flush();
 108                 if (validLen + (pos - startSeg + 1) >= bufferSize) {
 109                         // Too big for buffer so send directly
 110                         pdoc->SetStyleFor(pos - startSeg + 1, static_cast<char>(chAttr));
 111                 } else {
 112                         if (chAttr != chWhile)
 113                                 chFlags = 0;
 114                         chAttr |= chFlags;
 115                         for (unsigned int i = startSeg; i <= pos; i++) {
 116                                 PLATFORM_ASSERT((startPosStyling + validLen) < Length());
 117                                 styleBuf[validLen++] = static_cast<char>(chAttr);
 118                         }
 119                 }
 120         }
 121         startSeg = pos+1;
 122 }
 123
 124 void DocumentAccessor::SetLevel(int line, int level) {
 125         pdoc->SetLevel(line, level);
 126 }
 127
 128 void DocumentAccessor::Flush() {
 129         startPos = extremePosition;
 130         lenDoc = -1;
 131         if (validLen > 0) {
 132                 pdoc->SetStyles(validLen, styleBuf);
 133                 startPosStyling += validLen;
 134                 validLen = 0;
 135         }
 136 }
 137
 138 int DocumentAccessor::IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader) {
 139         int end = Length();
 140         int spaceFlags = 0;
 141
 142         // Determines the indentation level of the current line and also checks for consistent
 143         // indentation compared to the previous line.
 144         // Indentation is judged consistent when the indentation whitespace of each line lines
 145         // the same or the indentation of one line is a prefix of the other.
 146
 147         int pos = LineStart(line);
 148         char ch = (*this)[pos];
 149         int indent = 0;
 150         bool inPrevPrefix = line > 0;
 151         int posPrev = inPrevPrefix ? LineStart(line-1) : 0;
 152         while ((ch == ' ' || ch == '\t') && (pos < end)) {
 153                 if (inPrevPrefix) {
 154                         char chPrev = (*this)[posPrev++];
 155                         if (chPrev == ' ' || chPrev == '\t') {
 156                                 if (chPrev != ch)
 157                                         spaceFlags |= wsInconsistent;
 158                         } else {
 159                                 inPrevPrefix = false;
 160                         }
 161                 }
 162                 if (ch == ' ') {
 163                         spaceFlags |= wsSpace;
 164                         indent++;
 165                 } else {        // Tab
 166                         spaceFlags |= wsTab;
 167                         if (spaceFlags & wsSpace)
 168                                 spaceFlags |= wsSpaceTab;
 169                         indent = (indent / 8 + 1) * 8;
 170                 }
 171                 ch = (*this)[++pos];
 172         }
 173
 174         *flags = spaceFlags;
 175         indent += SC_FOLDLEVELBASE;
 176         // if completely empty line or the start of a comment...
 177         if ((ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') ||
 178                 (pfnIsCommentLeader && (*pfnIsCommentLeader)(*this, pos, end-pos)) )
 179                 return indent | SC_FOLDLEVELWHITEFLAG;
 180         else
 181                 return indent;
 182 }
 183