src/stc/scintilla/lexers/LexR.cxx

   1 // Scintilla source code edit control
   2 /** @file Lexr.cxx
   3  ** Lexer for R, S, SPlus Statistics Program (Heavily derived from CPP Lexer).
   4  **
   5  **/
   6 // Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
   7 // The License.txt file describes the conditions under which this software may be distributed.
   8
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <stdio.h>
  12 #include <stdarg.h>
  13 #include <assert.h>
  14 #include <ctype.h>
  15
  16 #include "ILexer.h"
  17 #include "Scintilla.h"
  18 #include "SciLexer.h"
  19
  20 #include "WordList.h"
  21 #include "LexAccessor.h"
  22 #include "Accessor.h"
  23 #include "StyleContext.h"
  24 #include "CharacterSet.h"
  25 #include "LexerModule.h"
  26
  27 #ifdef SCI_NAMESPACE
  28 using namespace Scintilla;
  29 #endif
  30
  31 static inline bool IsAWordChar(const int ch) {
  32         return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
  33 }
  34
  35 static inline bool IsAWordStart(const int ch) {
  36         return (ch < 0x80) && (isalnum(ch) || ch == '_');
  37 }
  38
  39 static inline bool IsAnOperator(const int ch) {
  40         if (isascii(ch) && isalnum(ch))
  41                 return false;
  42         // '.' left out as it is used to make up numbers
  43         if (ch == '-' || ch == '+' || ch == '!' || ch == '~' ||
  44                 ch == '?' || ch == ':' || ch == '*' || ch == '/' ||
  45                 ch == '^' || ch == '<' || ch == '>' || ch == '=' ||
  46                 ch == '&' || ch == '|' || ch == '$' || ch == '(' ||
  47                 ch == ')' || ch == '}' || ch == '{' || ch == '[' ||
  48                 ch == ']')
  49                 return true;
  50         return false;
  51 }
  52
  53 static void ColouriseRDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
  54                             Accessor &styler) {
  55
  56         WordList &keywords   = *keywordlists[0];
  57         WordList &keywords2 = *keywordlists[1];
  58         WordList &keywords3 = *keywordlists[2];
  59
  60
  61         // Do not leak onto next line
  62         if (initStyle == SCE_R_INFIXEOL)
  63                 initStyle = SCE_R_DEFAULT;
  64
  65
  66         StyleContext sc(startPos, length, initStyle, styler);
  67
  68         for (; sc.More(); sc.Forward()) {
  69
  70                 if (sc.atLineStart && (sc.state == SCE_R_STRING)) {
  71                         // Prevent SCE_R_STRINGEOL from leaking back to previous line
  72                         sc.SetState(SCE_R_STRING);
  73                 }
  74
  75                 // Determine if the current state should terminate.
  76                 if (sc.state == SCE_R_OPERATOR) {
  77                         sc.SetState(SCE_R_DEFAULT);
  78                 } else if (sc.state == SCE_R_NUMBER) {
  79                         if (!IsADigit(sc.ch) && !(sc.ch == '.' && IsADigit(sc.chNext))) {
  80                                 sc.SetState(SCE_R_DEFAULT);
  81                         }
  82                 } else if (sc.state == SCE_R_IDENTIFIER) {
  83                         if (!IsAWordChar(sc.ch)) {
  84                                 char s[100];
  85                                 sc.GetCurrent(s, sizeof(s));
  86                                 if (keywords.InList(s)) {
  87                                         sc.ChangeState(SCE_R_KWORD);
  88                                 } else if  (keywords2.InList(s)) {
  89                                         sc.ChangeState(SCE_R_BASEKWORD);
  90                                 } else if  (keywords3.InList(s)) {
  91                                         sc.ChangeState(SCE_R_OTHERKWORD);
  92                                 }
  93                                 sc.SetState(SCE_R_DEFAULT);
  94                         }
  95                 } else if (sc.state == SCE_R_COMMENT) {
  96                         if (sc.ch == '\r' || sc.ch == '\n') {
  97                                 sc.SetState(SCE_R_DEFAULT);
  98                         }
  99                 } else if (sc.state == SCE_R_STRING) {
 100                         if (sc.ch == '\\') {
 101                                 if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
 102                                         sc.Forward();
 103                                 }
 104                         } else if (sc.ch == '\"') {
 105                                 sc.ForwardSetState(SCE_R_DEFAULT);
 106                         }
 107                 } else if (sc.state == SCE_R_INFIX) {
 108                         if (sc.ch == '%') {
 109                                 sc.ForwardSetState(SCE_R_DEFAULT);
 110                         } else if (sc.atLineEnd) {
 111                                 sc.ChangeState(SCE_R_INFIXEOL);
 112                                 sc.ForwardSetState(SCE_R_DEFAULT);
 113                         }
 114                 }else if (sc.state == SCE_R_STRING2) {
 115                         if (sc.ch == '\\') {
 116                                 if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
 117                                         sc.Forward();
 118                                 }
 119                         } else if (sc.ch == '\'') {
 120                                 sc.ForwardSetState(SCE_R_DEFAULT);
 121                         }
 122                 }
 123
 124                 // Determine if a new state should be entered.
 125                 if (sc.state == SCE_R_DEFAULT) {
 126                         if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
 127                                 sc.SetState(SCE_R_NUMBER);
 128                         } else if (IsAWordStart(sc.ch) ) {
 129                                 sc.SetState(SCE_R_IDENTIFIER);
 130                         } else if (sc.Match('#')) {
 131                                         sc.SetState(SCE_R_COMMENT);
 132                         } else if (sc.ch == '\"') {
 133                                 sc.SetState(SCE_R_STRING);
 134                         } else if (sc.ch == '%') {
 135                                 sc.SetState(SCE_R_INFIX);
 136                         } else if (sc.ch == '\'') {
 137                                 sc.SetState(SCE_R_STRING2);
 138                         } else if (IsAnOperator(sc.ch)) {
 139                                 sc.SetState(SCE_R_OPERATOR);
 140                         }
 141                 }
 142         }
 143         sc.Complete();
 144 }
 145
 146 // Store both the current line's fold level and the next lines in the
 147 // level store to make it easy to pick up with each increment
 148 // and to make it possible to fiddle the current level for "} else {".
 149 static void FoldRDoc(unsigned int startPos, int length, int, WordList *[],
 150                        Accessor &styler) {
 151         bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
 152         bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
 153         unsigned int endPos = startPos + length;
 154         int visibleChars = 0;
 155         int lineCurrent = styler.GetLine(startPos);
 156         int levelCurrent = SC_FOLDLEVELBASE;
 157         if (lineCurrent > 0)
 158                 levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
 159         int levelMinCurrent = levelCurrent;
 160         int levelNext = levelCurrent;
 161         char chNext = styler[startPos];
 162         int styleNext = styler.StyleAt(startPos);
 163         for (unsigned int i = startPos; i < endPos; i++) {
 164                 char ch = chNext;
 165                 chNext = styler.SafeGetCharAt(i + 1);
 166                 int style = styleNext;
 167                 styleNext = styler.StyleAt(i + 1);
 168                 bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 169                 if (style == SCE_R_OPERATOR) {
 170                         if (ch == '{') {
 171                                 // Measure the minimum before a '{' to allow
 172                                 // folding on "} else {"
 173                                 if (levelMinCurrent > levelNext) {
 174                                         levelMinCurrent = levelNext;
 175                                 }
 176                                 levelNext++;
 177                         } else if (ch == '}') {
 178                                 levelNext--;
 179                         }
 180                 }
 181                 if (atEOL) {
 182                         int levelUse = levelCurrent;
 183                         if (foldAtElse) {
 184                                 levelUse = levelMinCurrent;
 185                         }
 186                         int lev = levelUse | levelNext << 16;
 187                         if (visibleChars == 0 && foldCompact)
 188                                 lev |= SC_FOLDLEVELWHITEFLAG;
 189                         if (levelUse < levelNext)
 190                                 lev |= SC_FOLDLEVELHEADERFLAG;
 191                         if (lev != styler.LevelAt(lineCurrent)) {
 192                                 styler.SetLevel(lineCurrent, lev);
 193                         }
 194                         lineCurrent++;
 195                         levelCurrent = levelNext;
 196                         levelMinCurrent = levelCurrent;
 197                         visibleChars = 0;
 198                 }
 199                 if (!isspacechar(ch))
 200                         visibleChars++;
 201         }
 202 }
 203
 204
 205 static const char * const RWordLists[] = {
 206             "Language Keywords",
 207             "Base / Default package function",
 208             "Other Package Functions",
 209             "Unused",
 210             "Unused",
 211             0,
 212         };
 213
 214
 215
 216 LexerModule lmR(SCLEX_R, ColouriseRDoc, "r", FoldRDoc, RWordLists);