scintilla/src/PositionCache.h

   1 // Scintilla source code edit control
   2 /** @file PositionCache.h
   3  ** Classes for caching layout information.
   4  **/
   5 // Copyright 1998-2009 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #ifndef POSITIONCACHE_H
   9 #define POSITIONCACHE_H
  10
  11 #ifdef SCI_NAMESPACE
  12 namespace Scintilla {
  13 #endif
  14
  15 static inline bool IsEOLChar(char ch) {
  16         return (ch == '\r') || (ch == '\n');
  17 }
  18
  19 /**
  20  */
  21 class LineLayout {
  22 private:
  23         friend class LineLayoutCache;
  24         int *lineStarts;
  25         int lenLineStarts;
  26         /// Drawing is only performed for @a maxLineLength characters on each line.
  27         int lineNumber;
  28         bool inCache;
  29 public:
  30         enum { wrapWidthInfinite = 0x7ffffff };
  31         int maxLineLength;
  32         int numCharsInLine;
  33         int numCharsBeforeEOL;
  34         enum validLevel { llInvalid, llCheckTextAndStyle, llPositions, llLines } validity;
  35         int xHighlightGuide;
  36         bool highlightColumn;
  37         bool containsCaret;
  38         int edgeColumn;
  39         char *chars;
  40         unsigned char *styles;
  41         XYPOSITION *positions;
  42         char bracePreviousStyles[2];
  43
  44         // Hotspot support
  45         Range hotspot;
  46
  47         // Wrapped line support
  48         int widthLine;
  49         int lines;
  50         XYPOSITION wrapIndent; // In pixels
  51
  52         explicit LineLayout(int maxLineLength_);
  53         virtual ~LineLayout();
  54         void Resize(int maxLineLength_);
  55         void Free();
  56         void Invalidate(validLevel validity_);
  57         int LineStart(int line) const;
  58         int LineLastVisible(int line) const;
  59         Range SubLineRange(int line) const;
  60         bool InLine(int offset, int line) const;
  61         void SetLineStart(int line, int start);
  62         void SetBracesHighlight(Range rangeLine, const Position braces[],
  63                 char bracesMatchStyle, int xHighlight, bool ignoreStyle);
  64         void RestoreBracesHighlight(Range rangeLine, const Position braces[], bool ignoreStyle);
  65         int FindBefore(XYPOSITION x, int lower, int upper) const;
  66         int FindPositionFromX(XYPOSITION x, Range range, bool charPosition) const;
  67         Point PointFromPosition(int posInLine, int lineHeight) const;
  68         int EndLineStyle() const;
  69 };
  70
  71 /**
  72  */
  73 class LineLayoutCache {
  74         int level;
  75         std::vector<LineLayout *>cache;
  76         bool allInvalidated;
  77         int styleClock;
  78         int useCount;
  79         void Allocate(size_t length_);
  80         void AllocateForLevel(int linesOnScreen, int linesInDoc);
  81 public:
  82         LineLayoutCache();
  83         virtual ~LineLayoutCache();
  84         void Deallocate();
  85         enum {
  86                 llcNone=SC_CACHE_NONE,
  87                 llcCaret=SC_CACHE_CARET,
  88                 llcPage=SC_CACHE_PAGE,
  89                 llcDocument=SC_CACHE_DOCUMENT
  90         };
  91         void Invalidate(LineLayout::validLevel validity_);
  92         void SetLevel(int level_);
  93         int GetLevel() const { return level; }
  94         LineLayout *Retrieve(int lineNumber, int lineCaret, int maxChars, int styleClock_,
  95                 int linesOnScreen, int linesInDoc);
  96         void Dispose(LineLayout *ll);
  97 };
  98
  99 class PositionCacheEntry {
 100         unsigned int styleNumber:8;
 101         unsigned int len:8;
 102         unsigned int clock:16;
 103         XYPOSITION *positions;
 104 public:
 105         PositionCacheEntry();
 106         ~PositionCacheEntry();
 107         void Set(unsigned int styleNumber_, const char *s_, unsigned int len_, XYPOSITION *positions_, unsigned int clock_);
 108         void Clear();
 109         bool Retrieve(unsigned int styleNumber_, const char *s_, unsigned int len_, XYPOSITION *positions_) const;
 110         static unsigned int Hash(unsigned int styleNumber_, const char *s, unsigned int len);
 111         bool NewerThan(const PositionCacheEntry &other) const;
 112         void ResetClock();
 113 };
 114
 115 class Representation {
 116 public:
 117         std::string stringRep;
 118         explicit Representation(const char *value="") : stringRep(value) {
 119         }
 120 };
 121
 122 typedef std::map<int, Representation> MapRepresentation;
 123
 124 class SpecialRepresentations {
 125         MapRepresentation mapReprs;
 126         short startByteHasReprs[0x100];
 127 public:
 128         SpecialRepresentations();
 129         void SetRepresentation(const char *charBytes, const char *value);
 130         void ClearRepresentation(const char *charBytes);
 131         const Representation *RepresentationFromCharacter(const char *charBytes, size_t len) const;
 132         bool Contains(const char *charBytes, size_t len) const;
 133         void Clear();
 134 };
 135
 136 struct TextSegment {
 137         int start;
 138         int length;
 139         const Representation *representation;
 140         TextSegment(int start_=0, int length_=0, const Representation *representation_=0) :
 141                 start(start_), length(length_), representation(representation_) {
 142         }
 143         int end() const {
 144                 return start + length;
 145         }
 146 };
 147
 148 // Class to break a line of text into shorter runs at sensible places.
 149 class BreakFinder {
 150         const LineLayout *ll;
 151         Range lineRange;
 152         int posLineStart;
 153         int nextBreak;
 154         std::vector<int> selAndEdge;
 155         unsigned int saeCurrentPos;
 156         int saeNext;
 157         int subBreak;
 158         const Document *pdoc;
 159         EncodingFamily encodingFamily;
 160         const SpecialRepresentations *preprs;
 161         void Insert(int val);
 162         // Private so BreakFinder objects can not be copied
 163         BreakFinder(const BreakFinder &);
 164 public:
 165         // If a whole run is longer than lengthStartSubdivision then subdivide
 166         // into smaller runs at spaces or punctuation.
 167         enum { lengthStartSubdivision = 300 };
 168         // Try to make each subdivided run lengthEachSubdivision or shorter.
 169         enum { lengthEachSubdivision = 100 };
 170         BreakFinder(const LineLayout *ll_, const Selection *psel, Range rangeLine_, int posLineStart_,
 171                 int xStart, bool breakForSelection, const Document *pdoc_, const SpecialRepresentations *preprs_);
 172         ~BreakFinder();
 173         TextSegment Next();
 174         bool More() const;
 175 };
 176
 177 class PositionCache {
 178         std::vector<PositionCacheEntry> pces;
 179         unsigned int clock;
 180         bool allClear;
 181         // Private so PositionCache objects can not be copied
 182         PositionCache(const PositionCache &);
 183 public:
 184         PositionCache();
 185         ~PositionCache();
 186         void Clear();
 187         void SetSize(size_t size_);
 188         size_t GetSize() const { return pces.size(); }
 189         void MeasureWidths(Surface *surface, const ViewStyle &vstyle, unsigned int styleNumber,
 190                 const char *s, unsigned int len, XYPOSITION *positions, Document *pdoc);
 191 };
 192
 193 inline bool IsSpaceOrTab(int ch) {
 194         return ch == ' ' || ch == '\t';
 195 }
 196
 197 #ifdef SCI_NAMESPACE
 198 }
 199 #endif
 200
 201 #endif