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 #ifdef SCI_NAMESPACE
  21 using namespace Scintilla;
  22 #endif
  23
  24 WindowAccessor::~WindowAccessor() {
  25 }
  26
  27 bool WindowAccessor::InternalIsLeadByte(char ch) {
  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 Platform::IsDBCSLeadByte(codePage, ch);
  34 }
  35
  36 void WindowAccessor::Fill(int position) {
  37         if (lenDoc == -1)
  38                 lenDoc = Platform::SendScintilla(id, SCI_GETTEXTLENGTH, 0, 0);
  39         startPos = position - slopSize;
  40         if (startPos + bufferSize > lenDoc)
  41                 startPos = lenDoc - bufferSize;
  42         if (startPos < 0)
  43                 startPos = 0;
  44         endPos = startPos + bufferSize;
  45         if (endPos > lenDoc)
  46                 endPos = lenDoc;
  47
  48         Sci_TextRange tr = {{startPos, endPos}, buf};
  49         Platform::SendScintillaPointer(id, SCI_GETTEXTRANGE, 0, &tr);
  50 }
  51
  52 bool WindowAccessor::Match(int pos, const char *s) {
  53         for (int i=0; *s; i++) {
  54                 if (*s != SafeGetCharAt(pos+i))
  55                         return false;
  56                 s++;
  57         }
  58         return true;
  59 }
  60
  61 char WindowAccessor::StyleAt(int position) {
  62         return static_cast<char>(Platform::SendScintilla(
  63                 id, SCI_GETSTYLEAT, position, 0));
  64 }
  65
  66 int WindowAccessor::GetLine(int position) {
  67         return Platform::SendScintilla(id, SCI_LINEFROMPOSITION, position, 0);
  68 }
  69
  70 int WindowAccessor::LineStart(int line) {
  71         return Platform::SendScintilla(id, SCI_POSITIONFROMLINE, line, 0);
  72 }
  73
  74 int WindowAccessor::LevelAt(int line) {
  75         return Platform::SendScintilla(id, SCI_GETFOLDLEVEL, line, 0);
  76 }
  77
  78 int WindowAccessor::Length() {
  79         if (lenDoc == -1)
  80                 lenDoc = Platform::SendScintilla(id, SCI_GETTEXTLENGTH, 0, 0);
  81         return lenDoc;
  82 }
  83
  84 int WindowAccessor::GetLineState(int line) {
  85         return Platform::SendScintilla(id, SCI_GETLINESTATE, line);
  86 }
  87
  88 int WindowAccessor::SetLineState(int line, int state) {
  89         return Platform::SendScintilla(id, SCI_SETLINESTATE, line, state);
  90 }
  91
  92 void WindowAccessor::StartAt(unsigned int start, char chMask) {
  93         Platform::SendScintilla(id, SCI_STARTSTYLING, start, chMask);
  94 }
  95
  96 void WindowAccessor::StartSegment(unsigned int pos) {
  97         startSeg = pos;
  98 }
  99
 100 void WindowAccessor::ColourTo(unsigned int pos, int chAttr) {
 101         // Only perform styling if non empty range
 102         if (pos != startSeg - 1) {
 103                 if (pos < startSeg) {
 104                         Platform::DebugPrintf("Bad colour positions %d - %d\n", startSeg, pos);
 105                 }
 106
 107                 if (validLen + (pos - startSeg + 1) >= bufferSize)
 108                         Flush();
 109                 if (validLen + (pos - startSeg + 1) >= bufferSize) {
 110                         // Too big for buffer so send directly
 111                         Platform::SendScintilla(id, SCI_SETSTYLING, pos - startSeg + 1, chAttr);
 112                 } else {
 113                         if (chAttr != chWhile)
 114                                 chFlags = 0;
 115                         chAttr |= chFlags;
 116                         for (unsigned int i = startSeg; i <= pos; i++) {
 117                                 styleBuf[validLen++] = static_cast<char>(chAttr);
 118                         }
 119                 }
 120         }
 121         startSeg = pos+1;
 122 }
 123
 124 void WindowAccessor::SetLevel(int line, int level) {
 125         Platform::SendScintilla(id, SCI_SETFOLDLEVEL, line, level);
 126 }
 127
 128 void WindowAccessor::Flush() {
 129         startPos = extremePosition;
 130         lenDoc = -1;
 131         if (validLen > 0) {
 132                 Platform::SendScintillaPointer(id, SCI_SETSTYLINGEX, validLen,
 133                         styleBuf);
 134                 validLen = 0;
 135         }
 136 }
 137
 138 int WindowAccessor::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 (isspace(ch) || (pfnIsCommentLeader && (*pfnIsCommentLeader)(*this, pos, end-pos)) )
 178                 return indent | SC_FOLDLEVELWHITEFLAG;
 179         else
 180                 return indent;
 181 }
 182
 183 void WindowAccessor::IndicatorFill(int start, int end, int indicator, int value) {
 184         Platform::SendScintilla(id, SCI_SETINDICATORCURRENT, indicator);
 185         if (value) {
 186                 Platform::SendScintilla(id, SCI_SETINDICATORVALUE, value);
 187                 Platform::SendScintilla(id, SCI_INDICATORFILLRANGE, start, end - start);
 188         } else {
 189                 Platform::SendScintilla(id, SCI_INDICATORCLEARRANGE, start, end - start);
 190         }
 191 }