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DocumentAccessor.cxx

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// Scintilla source code edit control
/** @file DocumentAccessor.cxx
 ** Rapid easy access to contents of a Scintilla.
 **/
// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>

#include "Platform.h"

#include "PropSet.h"
#include "SVector.h"
#include "Accessor.h"
#include "DocumentAccessor.h"
#include "CellBuffer.h"
#include "Scintilla.h"
#include "Document.h"

DocumentAccessor::~DocumentAccessor() {
}

bool DocumentAccessor::InternalIsLeadByte(char ch) {
      if (SC_CP_UTF8 == codePage)
            // For lexing, all characters >= 0x80 are treated the
            // same so none is considered a lead byte.
            return false;
      else
            return Platform::IsDBCSLeadByte(codePage, ch);
}

void DocumentAccessor::Fill(int position) {
      if (lenDoc == -1)
            lenDoc = pdoc->Length();
      startPos = position - slopSize;
      if (startPos + bufferSize > lenDoc)
            startPos = lenDoc - bufferSize;
      if (startPos < 0)
            startPos = 0;
      endPos = startPos + bufferSize;
      if (endPos > lenDoc)
            endPos = lenDoc;

      pdoc->GetCharRange(buf, startPos, endPos-startPos);
      buf[endPos-startPos] = '\0';
}

bool DocumentAccessor::Match(int pos, const char *s) {
      for (int i=0; *s; i++) {
            if (*s != SafeGetCharAt(pos+i))
                  return false;
            s++;
      }
      return true;
}

char DocumentAccessor::StyleAt(int position) {
      return pdoc->StyleAt(position);
}

int DocumentAccessor::GetLine(int position) {
      return pdoc->LineFromPosition(position);
}

int DocumentAccessor::LineStart(int line) {
      return pdoc->LineStart(line);
}

int DocumentAccessor::LevelAt(int line) {
      return pdoc->GetLevel(line);
}

int DocumentAccessor::Length() {
      if (lenDoc == -1)
            lenDoc = pdoc->Length();
      return lenDoc;
}

int DocumentAccessor::GetLineState(int line) {
      return pdoc->GetLineState(line);
}

int DocumentAccessor::SetLineState(int line, int state) {
      return pdoc->SetLineState(line, state);
}

void DocumentAccessor::StartAt(unsigned int start, char chMask) {
      pdoc->StartStyling(start, chMask);
      startPosStyling = start;
}

void DocumentAccessor::StartSegment(unsigned int pos) {
      startSeg = pos;
}

void DocumentAccessor::ColourTo(unsigned int pos, int chAttr) {
      // Only perform styling if non empty range
      if (pos != startSeg - 1) {
            if (pos < startSeg) {
                  Platform::DebugPrintf("Bad colour positions %d - %d\n", startSeg, pos);
            }

            if (validLen + (pos - startSeg + 1) >= bufferSize)
                  Flush();
            if (validLen + (pos - startSeg + 1) >= bufferSize) {
                  // Too big for buffer so send directly
                  pdoc->SetStyleFor(pos - startSeg + 1, static_cast<char>(chAttr));
            } else {
                  if (chAttr != chWhile)
                        chFlags = 0;
                  chAttr |= chFlags;
                  for (unsigned int i = startSeg; i <= pos; i++) {
                        PLATFORM_ASSERT((startPosStyling + validLen) < Length());
                        styleBuf[validLen++] = static_cast<char>(chAttr);
                  }
            }
      }
      startSeg = pos+1;
}

void DocumentAccessor::SetLevel(int line, int level) {
      pdoc->SetLevel(line, level);
}

void DocumentAccessor::Flush() {
      startPos = extremePosition;
      lenDoc = -1;
      if (validLen > 0) {
            pdoc->SetStyles(validLen, styleBuf);
            startPosStyling += validLen;
            validLen = 0;
      }
}

int DocumentAccessor::IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader) {
      int end = Length();
      int spaceFlags = 0;

      // Determines the indentation level of the current line and also checks for consistent
      // indentation compared to the previous line.
      // Indentation is judged consistent when the indentation whitespace of each line lines
      // the same or the indentation of one line is a prefix of the other.

      int pos = LineStart(line);
      char ch = (*this)[pos];
      int indent = 0;
      bool inPrevPrefix = line > 0;
      int posPrev = inPrevPrefix ? LineStart(line-1) : 0;
      while ((ch == ' ' || ch == '\t') && (pos < end)) {
            if (inPrevPrefix) {
                  char chPrev = (*this)[posPrev++];
                  if (chPrev == ' ' || chPrev == '\t') {
                        if (chPrev != ch)
                              spaceFlags |= wsInconsistent;
                  } else {
                        inPrevPrefix = false;
                  }
            }
            if (ch == ' ') {
                  spaceFlags |= wsSpace;
                  indent++;
            } else {    // Tab
                  spaceFlags |= wsTab;
                  if (spaceFlags & wsSpace)
                        spaceFlags |= wsSpaceTab;
                  indent = (indent / 8 + 1) * 8;
            }
            ch = (*this)[++pos];
      }

      *flags = spaceFlags;
      indent += SC_FOLDLEVELBASE;
      // if completely empty line or the start of a comment...
      if ((ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') ||
            (pfnIsCommentLeader && (*pfnIsCommentLeader)(*this, pos, end-pos)) )
            return indent | SC_FOLDLEVELWHITEFLAG;
      else
            return indent;
}


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