src/stc/scintilla/src/WindowAccessor.cxx

   1 // Scintilla source code edit control
   2 /** @file WindowAccessor.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 "Accessor.h"
  17 #include "WindowAccessor.h"
  18 #include "Scintilla.h"
  19
  20 WindowAccessor::~WindowAccessor() {
  21 }
  22
  23 #if PLAT_WIN
  24 bool WindowAccessor::InternalIsLeadByte(char ch) {
  25         if (SC_CP_UTF8 == codePage)
  26                 // For lexing, all characters >= 0x80 are treated the
  27                 // same so none is considered a lead byte.
  28                 return false;
  29         else
  30                 return IsDBCSLeadByteEx(codePage, ch);
  31 }
  32 #else
  33 // PLAT_GTK or PLAT_WX
  34 // TODO: support DBCS under GTK+ and WX
  35 bool WindowAccessor::InternalIsLeadByte(char) {
  36         return false;
  37 }
  38 #endif
  39
  40 void WindowAccessor::Fill(int position) {
  41         if (lenDoc == -1)
  42                 lenDoc = Platform::SendScintilla(id, SCI_GETTEXTLENGTH, 0, 0);
  43         startPos = position - slopSize;
  44         if (startPos + bufferSize > lenDoc)
  45                 startPos = lenDoc - bufferSize;
  46         if (startPos < 0)
  47                 startPos = 0;
  48         endPos = startPos + bufferSize;
  49         if (endPos > lenDoc)
  50                 endPos = lenDoc;
  51
  52         TextRange tr = {{startPos, endPos}, buf};
  53         Platform::SendScintilla(id, SCI_GETTEXTRANGE, 0, reinterpret_cast<long>(&tr));
  54 }
  55
  56 char WindowAccessor::StyleAt(int position) {
  57         return static_cast<char>(Platform::SendScintilla(
  58                 id, SCI_GETSTYLEAT, position, 0));
  59 }
  60
  61 int WindowAccessor::GetLine(int position) {
  62         return Platform::SendScintilla(id, SCI_LINEFROMPOSITION, position, 0);
  63 }
  64
  65 int WindowAccessor::LineStart(int line) {
  66         return Platform::SendScintilla(id, SCI_POSITIONFROMLINE, line, 0);
  67 }
  68
  69 int WindowAccessor::LevelAt(int line) {
  70         return Platform::SendScintilla(id, SCI_GETFOLDLEVEL, line, 0);
  71 }
  72
  73 int WindowAccessor::Length() {
  74         if (lenDoc == -1)
  75                 lenDoc = Platform::SendScintilla(id, SCI_GETTEXTLENGTH, 0, 0);
  76         return lenDoc;
  77 }
  78
  79 int WindowAccessor::GetLineState(int line) {
  80         return Platform::SendScintilla(id, SCI_GETLINESTATE, line);
  81 }
  82
  83 int WindowAccessor::SetLineState(int line, int state) {
  84         return Platform::SendScintilla(id, SCI_SETLINESTATE, line, state);
  85 }
  86
  87 void WindowAccessor::StartAt(unsigned int start, char chMask) {
  88         Platform::SendScintilla(id, SCI_STARTSTYLING, start, chMask);
  89 }
  90
  91 void WindowAccessor::StartSegment(unsigned int pos) {
  92         startSeg = pos;
  93 }
  94
  95 void WindowAccessor::ColourTo(unsigned int pos, int chAttr) {
  96         // Only perform styling if non empty range
  97         if (pos != startSeg - 1) {
  98                 if (pos < startSeg) {
  99                         Platform::DebugPrintf("Bad colour positions %d - %d\n", startSeg, pos);
 100                 }
 101
 102                 if (validLen + (pos - startSeg + 1) >= bufferSize)
 103                         Flush();
 104                 if (validLen + (pos - startSeg + 1) >= bufferSize) {
 105                         // Too big for buffer so send directly
 106                         Platform::SendScintilla(id, SCI_SETSTYLING, pos - startSeg + 1, chAttr);
 107                 } else {
 108                         if (chAttr != chWhile)
 109                                 chFlags = 0;
 110                         chAttr |= chFlags;
 111                         for (unsigned int i = startSeg; i <= pos; i++) {
 112                                 styleBuf[validLen++] = static_cast<char>(chAttr);
 113                         }
 114                 }
 115         }
 116         startSeg = pos+1;
 117 }
 118
 119 void WindowAccessor::SetLevel(int line, int level) {
 120         Platform::SendScintilla(id, SCI_SETFOLDLEVEL, line, level);
 121 }
 122
 123 void WindowAccessor::Flush() {
 124         startPos = extremePosition;
 125         lenDoc = -1;
 126         if (validLen > 0) {
 127                 Platform::SendScintilla(id, SCI_SETSTYLINGEX, validLen,
 128                         reinterpret_cast<long>(styleBuf));
 129                 validLen = 0;
 130         }
 131 }
 132
 133 int WindowAccessor::IndentAmount(int line, int *flags, PFNIsCommentLeader pfnIsCommentLeader) {
 134         int end = Length();
 135         int spaceFlags = 0;
 136
 137         // Determines the indentation level of the current line and also checks for consistent
 138         // indentation compared to the previous line.
 139         // Indentation is judged consistent when the indentation whitespace of each line lines
 140         // the same or the indentation of one line is a prefix of the other.
 141
 142         int pos = LineStart(line);
 143         char ch = (*this)[pos];
 144         int indent = 0;
 145         bool inPrevPrefix = line > 0;
 146         int posPrev = inPrevPrefix ? LineStart(line-1) : 0;
 147         while ((ch == ' ' || ch == '\t') && (pos < end)) {
 148                 if (inPrevPrefix) {
 149                         char chPrev = (*this)[posPrev++];
 150                         if (chPrev == ' ' || chPrev == '\t') {
 151                                 if (chPrev != ch)
 152                                         spaceFlags |= wsInconsistent;
 153                         } else {
 154                                 inPrevPrefix = false;
 155                         }
 156                 }
 157                 if (ch == ' ') {
 158                         spaceFlags |= wsSpace;
 159                         indent++;
 160                 } else {        // Tab
 161                         spaceFlags |= wsTab;
 162                         if (spaceFlags & wsSpace)
 163                                 spaceFlags |= wsSpaceTab;
 164                         indent = (indent / 8 + 1) * 8;
 165                 }
 166                 ch = (*this)[++pos];
 167         }
 168
 169         *flags = spaceFlags;
 170         indent += SC_FOLDLEVELBASE;
 171         // if completely empty line or the start of a comment...
 172         if (isspace(ch) || (pfnIsCommentLeader && (*pfnIsCommentLeader)(*this, pos, end-pos)) )
 173                 return indent | SC_FOLDLEVELWHITEFLAG;
 174         else
 175                 return indent;
 176 }
 177