src/stc/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 #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 == '.' ||
  33                 ch == '_' || ch == '?');
  34 }
  35
  36 static inline bool IsAWordStart(const int ch) {
  37         return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '.' ||
  38                 ch == '%' || ch == '@' || ch == '$' || ch == '?');
  39 }
  40
  41 static inline bool IsCsoundOperator(char ch) {
  42         if (isascii(ch) && isalnum(ch))
  43                 return false;
  44         // '.' left out as it is used to make up numbers
  45         if (ch == '*' || ch == '/' || ch == '-' || ch == '+' ||
  46                 ch == '(' || ch == ')' || ch == '=' || ch == '^' ||
  47                 ch == '[' || ch == ']' || ch == '<' || ch == '&' ||
  48                 ch == '>' || ch == ',' || ch == '|' || ch == '~' ||
  49                 ch == '%' || ch == ':')
  50                 return true;
  51         return false;
  52 }
  53
  54 static void ColouriseCsoundDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
  55                                 Accessor &styler) {
  56
  57         WordList &opcode = *keywordlists[0];
  58         WordList &headerStmt = *keywordlists[1];
  59         WordList &otherKeyword = *keywordlists[2];
  60
  61         // Do not leak onto next line
  62         if (initStyle == SCE_CSOUND_STRINGEOL)
  63                 initStyle = SCE_CSOUND_DEFAULT;
  64
  65         StyleContext sc(startPos, length, initStyle, styler);
  66
  67         for (; sc.More(); sc.Forward())
  68         {
  69                 // Handle line continuation generically.
  70                 if (sc.ch == '\\') {
  71                         if (sc.chNext == '\n' || sc.chNext == '\r') {
  72                                 sc.Forward();
  73                                 if (sc.ch == '\r' && sc.chNext == '\n') {
  74                                         sc.Forward();
  75                                 }
  76                                 continue;
  77                         }
  78                 }
  79
  80                 // Determine if the current state should terminate.
  81                 if (sc.state == SCE_CSOUND_OPERATOR) {
  82                         if (!IsCsoundOperator(static_cast<char>(sc.ch))) {
  83                             sc.SetState(SCE_CSOUND_DEFAULT);
  84                         }
  85                 }else if (sc.state == SCE_CSOUND_NUMBER) {
  86                         if (!IsAWordChar(sc.ch)) {
  87                                 sc.SetState(SCE_CSOUND_DEFAULT);
  88                         }
  89                 } else if (sc.state == SCE_CSOUND_IDENTIFIER) {
  90                         if (!IsAWordChar(sc.ch) ) {
  91                                 char s[100];
  92                                 sc.GetCurrent(s, sizeof(s));
  93
  94                                 if (opcode.InList(s)) {
  95                                         sc.ChangeState(SCE_CSOUND_OPCODE);
  96                                 } else if (headerStmt.InList(s)) {
  97                                         sc.ChangeState(SCE_CSOUND_HEADERSTMT);
  98                                 } else if (otherKeyword.InList(s)) {
  99                                         sc.ChangeState(SCE_CSOUND_USERKEYWORD);
 100                                 } else if (s[0] == 'p') {
 101                                         sc.ChangeState(SCE_CSOUND_PARAM);
 102                                 } else if (s[0] == 'a') {
 103                                         sc.ChangeState(SCE_CSOUND_ARATE_VAR);
 104                                 } else if (s[0] == 'k') {
 105                                         sc.ChangeState(SCE_CSOUND_KRATE_VAR);
 106                                 } else if (s[0] == 'i') { // covers both i-rate variables and i-statements
 107                                         sc.ChangeState(SCE_CSOUND_IRATE_VAR);
 108                                 } else if (s[0] == 'g') {
 109                                         sc.ChangeState(SCE_CSOUND_GLOBAL_VAR);
 110                                 }
 111                                 sc.SetState(SCE_CSOUND_DEFAULT);
 112                         }
 113                 }
 114                 else if (sc.state == SCE_CSOUND_COMMENT ) {
 115                         if (sc.atLineEnd) {
 116                                 sc.SetState(SCE_CSOUND_DEFAULT);
 117                         }
 118                 }
 119                 else if ((sc.state == SCE_CSOUND_ARATE_VAR) ||
 120                         (sc.state == SCE_CSOUND_KRATE_VAR) ||
 121                 (sc.state == SCE_CSOUND_IRATE_VAR)) {
 122                         if (!IsAWordChar(sc.ch)) {
 123                                 sc.SetState(SCE_CSOUND_DEFAULT);
 124                         }
 125                 }
 126
 127                 // Determine if a new state should be entered.
 128                 if (sc.state == SCE_CSOUND_DEFAULT) {
 129                         if (sc.ch == ';'){
 130                                 sc.SetState(SCE_CSOUND_COMMENT);
 131                         } else if (isdigit(sc.ch) || (sc.ch == '.' && isdigit(sc.chNext))) {
 132                                 sc.SetState(SCE_CSOUND_NUMBER);
 133                         } else if (IsAWordStart(sc.ch)) {
 134                                 sc.SetState(SCE_CSOUND_IDENTIFIER);
 135                         } else if (IsCsoundOperator(static_cast<char>(sc.ch))) {
 136                                 sc.SetState(SCE_CSOUND_OPERATOR);
 137                         } else if (sc.ch == 'p') {
 138                                 sc.SetState(SCE_CSOUND_PARAM);
 139                         } else if (sc.ch == 'a') {
 140                                 sc.SetState(SCE_CSOUND_ARATE_VAR);
 141                         } else if (sc.ch == 'k') {
 142                                 sc.SetState(SCE_CSOUND_KRATE_VAR);
 143                         } else if (sc.ch == 'i') { // covers both i-rate variables and i-statements
 144                                 sc.SetState(SCE_CSOUND_IRATE_VAR);
 145                         } else if (sc.ch == 'g') {
 146                                 sc.SetState(SCE_CSOUND_GLOBAL_VAR);
 147                         }
 148                 }
 149         }
 150         sc.Complete();
 151 }
 152
 153 static void FoldCsoundInstruments(unsigned int startPos, int length, int /* initStyle */, WordList *[],
 154                 Accessor &styler) {
 155         unsigned int lengthDoc = startPos + length;
 156         int visibleChars = 0;
 157         int lineCurrent = styler.GetLine(startPos);
 158         int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
 159         int levelCurrent = levelPrev;
 160         char chNext = styler[startPos];
 161         int stylePrev = 0;
 162         int styleNext = styler.StyleAt(startPos);
 163         for (unsigned int i = startPos; i < lengthDoc; 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 ((stylePrev != SCE_CSOUND_OPCODE) && (style == SCE_CSOUND_OPCODE)) {
 170                         char s[20];
 171                         unsigned int j = 0;
 172                         while ((j < (sizeof(s) - 1)) && (iswordchar(styler[i + j]))) {
 173                                 s[j] = styler[i + j];
 174                                 j++;
 175                         }
 176                         s[j] = '\0';
 177
 178                         if (strcmp(s, "instr") == 0)
 179                                 levelCurrent++;
 180                         if (strcmp(s, "endin") == 0)
 181                                 levelCurrent--;
 182                 }
 183
 184                 if (atEOL) {
 185                         int lev = levelPrev;
 186                         if (visibleChars == 0)
 187                                 lev |= SC_FOLDLEVELWHITEFLAG;
 188                         if ((levelCurrent > levelPrev) && (visibleChars > 0))
 189                                 lev |= SC_FOLDLEVELHEADERFLAG;
 190                         if (lev != styler.LevelAt(lineCurrent)) {
 191                                 styler.SetLevel(lineCurrent, lev);
 192                         }
 193                         lineCurrent++;
 194                         levelPrev = levelCurrent;
 195                         visibleChars = 0;
 196                 }
 197                 if (!isspacechar(ch))
 198                         visibleChars++;
 199                 stylePrev = style;
 200         }
 201         // Fill in the real level of the next line, keeping the current flags as they will be filled in later
 202         int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
 203         styler.SetLevel(lineCurrent, levelPrev | flagsNext);
 204 }
 205
 206
 207 static const char * const csoundWordListDesc[] = {
 208         "Opcodes",
 209         "Header Statements",
 210         "User keywords",
 211         0
 212 };
 213
 214 LexerModule lmCsound(SCLEX_CSOUND, ColouriseCsoundDoc, "csound", FoldCsoundInstruments, csoundWordListDesc);