ext/scintilla/lexers/LexCsound.cxx

   1 // Scintilla source code edit control
   2 /** @file LexCsound.cxx
   3  ** Lexer for Csound (Orchestra & Score)
   4  ** Written by Georg Ritter - <ritterfuture A T gmail D O T com>
   5  **/
   6 // Copyright 1998-2003 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 using namespace Scintilla;
  28
  29 static inline bool IsAWordChar(const int ch) {
  30         return (ch < 0x80) && (isalnum(ch) || ch == '.' ||
  31                 ch == '_' || ch == '?');
  32 }
  33
  34 static inline bool IsAWordStart(const int ch) {
  35         return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '.' ||
  36                 ch == '%' || ch == '@' || ch == '$' || ch == '?');
  37 }
  38
  39 static inline bool IsCsoundOperator(char 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 == ':')
  48                 return true;
  49         return false;
  50 }
  51
  52 static void ColouriseCsoundDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[],
  53                                 Accessor &styler) {
  54
  55         WordList &opcode = *keywordlists[0];
  56         WordList &headerStmt = *keywordlists[1];
  57         WordList &otherKeyword = *keywordlists[2];
  58
  59         // Do not leak onto next line
  60         if (initStyle == SCE_CSOUND_STRINGEOL)
  61                 initStyle = SCE_CSOUND_DEFAULT;
  62
  63         StyleContext sc(startPos, length, initStyle, styler);
  64
  65         for (; sc.More(); sc.Forward())
  66         {
  67                 // Handle line continuation generically.
  68                 if (sc.ch == '\\') {
  69                         if (sc.chNext == '\n' || sc.chNext == '\r') {
  70                                 sc.Forward();
  71                                 if (sc.ch == '\r' && sc.chNext == '\n') {
  72                                         sc.Forward();
  73                                 }
  74                                 continue;
  75                         }
  76                 }
  77
  78                 // Determine if the current state should terminate.
  79                 if (sc.state == SCE_CSOUND_OPERATOR) {
  80                         if (!IsCsoundOperator(static_cast<char>(sc.ch))) {
  81                             sc.SetState(SCE_CSOUND_DEFAULT);
  82                         }
  83                 }else if (sc.state == SCE_CSOUND_NUMBER) {
  84                         if (!IsAWordChar(sc.ch)) {
  85                                 sc.SetState(SCE_CSOUND_DEFAULT);
  86                         }
  87                 } else if (sc.state == SCE_CSOUND_IDENTIFIER) {
  88                         if (!IsAWordChar(sc.ch) ) {
  89                                 char s[100];
  90                                 sc.GetCurrent(s, sizeof(s));
  91
  92                                 if (opcode.InList(s)) {
  93                                         sc.ChangeState(SCE_CSOUND_OPCODE);
  94                                 } else if (headerStmt.InList(s)) {
  95                                         sc.ChangeState(SCE_CSOUND_HEADERSTMT);
  96                                 } else if (otherKeyword.InList(s)) {
  97                                         sc.ChangeState(SCE_CSOUND_USERKEYWORD);
  98                                 } else if (s[0] == 'p') {
  99                                         sc.ChangeState(SCE_CSOUND_PARAM);
 100                                 } else if (s[0] == 'a') {
 101                                         sc.ChangeState(SCE_CSOUND_ARATE_VAR);
 102                                 } else if (s[0] == 'k') {
 103                                         sc.ChangeState(SCE_CSOUND_KRATE_VAR);
 104                                 } else if (s[0] == 'i') { // covers both i-rate variables and i-statements
 105                                         sc.ChangeState(SCE_CSOUND_IRATE_VAR);
 106                                 } else if (s[0] == 'g') {
 107                                         sc.ChangeState(SCE_CSOUND_GLOBAL_VAR);
 108                                 }
 109                                 sc.SetState(SCE_CSOUND_DEFAULT);
 110                         }
 111                 }
 112                 else if (sc.state == SCE_CSOUND_COMMENT ) {
 113                         if (sc.atLineEnd) {
 114                                 sc.SetState(SCE_CSOUND_DEFAULT);
 115                         }
 116                 }
 117                 else if ((sc.state == SCE_CSOUND_ARATE_VAR) ||
 118                         (sc.state == SCE_CSOUND_KRATE_VAR) ||
 119                 (sc.state == SCE_CSOUND_IRATE_VAR)) {
 120                         if (!IsAWordChar(sc.ch)) {
 121                                 sc.SetState(SCE_CSOUND_DEFAULT);
 122                         }
 123                 }
 124
 125                 // Determine if a new state should be entered.
 126                 if (sc.state == SCE_CSOUND_DEFAULT) {
 127                         if (sc.ch == ';'){
 128                                 sc.SetState(SCE_CSOUND_COMMENT);
 129                         } else if (isdigit(sc.ch) || (sc.ch == '.' && isdigit(sc.chNext))) {
 130                                 sc.SetState(SCE_CSOUND_NUMBER);
 131                         } else if (IsAWordStart(sc.ch)) {
 132                                 sc.SetState(SCE_CSOUND_IDENTIFIER);
 133                         } else if (IsCsoundOperator(static_cast<char>(sc.ch))) {
 134                                 sc.SetState(SCE_CSOUND_OPERATOR);
 135                         } else if (sc.ch == 'p') {
 136                                 sc.SetState(SCE_CSOUND_PARAM);
 137                         } else if (sc.ch == 'a') {
 138                                 sc.SetState(SCE_CSOUND_ARATE_VAR);
 139                         } else if (sc.ch == 'k') {
 140                                 sc.SetState(SCE_CSOUND_KRATE_VAR);
 141                         } else if (sc.ch == 'i') { // covers both i-rate variables and i-statements
 142                                 sc.SetState(SCE_CSOUND_IRATE_VAR);
 143                         } else if (sc.ch == 'g') {
 144                                 sc.SetState(SCE_CSOUND_GLOBAL_VAR);
 145                         }
 146                 }
 147         }
 148         sc.Complete();
 149 }
 150
 151 static void FoldCsoundInstruments(Sci_PositionU startPos, Sci_Position length, int /* initStyle */, WordList *[],
 152                 Accessor &styler) {
 153         Sci_PositionU lengthDoc = startPos + length;
 154         int visibleChars = 0;
 155         Sci_Position lineCurrent = styler.GetLine(startPos);
 156         int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
 157         int levelCurrent = levelPrev;
 158         char chNext = styler[startPos];
 159         int stylePrev = 0;
 160         int styleNext = styler.StyleAt(startPos);
 161         for (Sci_PositionU i = startPos; i < lengthDoc; i++) {
 162                 char ch = chNext;
 163                 chNext = styler.SafeGetCharAt(i + 1);
 164                 int style = styleNext;
 165                 styleNext = styler.StyleAt(i + 1);
 166                 bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 167                 if ((stylePrev != SCE_CSOUND_OPCODE) && (style == SCE_CSOUND_OPCODE)) {
 168                         char s[20];
 169                         unsigned int j = 0;
 170                         while ((j < (sizeof(s) - 1)) && (iswordchar(styler[i + j]))) {
 171                                 s[j] = styler[i + j];
 172                                 j++;
 173                         }
 174                         s[j] = '\0';
 175
 176                         if (strcmp(s, "instr") == 0)
 177                                 levelCurrent++;
 178                         if (strcmp(s, "endin") == 0)
 179                                 levelCurrent--;
 180                 }
 181
 182                 if (atEOL) {
 183                         int lev = levelPrev;
 184                         if (visibleChars == 0)
 185                                 lev |= SC_FOLDLEVELWHITEFLAG;
 186                         if ((levelCurrent > levelPrev) && (visibleChars > 0))
 187                                 lev |= SC_FOLDLEVELHEADERFLAG;
 188                         if (lev != styler.LevelAt(lineCurrent)) {
 189                                 styler.SetLevel(lineCurrent, lev);
 190                         }
 191                         lineCurrent++;
 192                         levelPrev = levelCurrent;
 193                         visibleChars = 0;
 194                 }
 195                 if (!isspacechar(ch))
 196                         visibleChars++;
 197                 stylePrev = style;
 198         }
 199         // Fill in the real level of the next line, keeping the current flags as they will be filled in later
 200         int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
 201         styler.SetLevel(lineCurrent, levelPrev | flagsNext);
 202 }
 203
 204
 205 static const char * const csoundWordListDesc[] = {
 206         "Opcodes",
 207         "Header Statements",
 208         "User keywords",
 209         0
 210 };
 211
 212 LexerModule lmCsound(SCLEX_CSOUND, ColouriseCsoundDoc, "csound", FoldCsoundInstruments, csoundWordListDesc);