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