contrib/src/stc/scintilla/src/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 <ctype.h>
  12 #include <stdio.h>
  13 #include <stdarg.h>
  14 #include "Platform.h"
  15
  16 #include "PropSet.h"
  17 #include "Accessor.h"
  18 #include "StyleContext.h"
  19 #include "KeyWords.h"
  20 #include "Scintilla.h"
  21 #include "SciLexer.h"
  22
  23
  24 static inline bool IsAWordChar(const int ch) {
  25         return (ch < 0x80) && (isalnum(ch) || ch == '.' ||
  26                 ch == '_' || ch == '?');
  27 }
  28
  29 static inline bool IsAWordStart(const int ch) {
  30         return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '.' ||
  31                 ch == '%' || ch == '@' || ch == '$' || ch == '?');
  32 }
  33
  34 static inline bool IsCsoundOperator(char ch) {
  35         if (isalnum(ch))
  36                 return false;
  37         // '.' left out as it is used to make up numbers
  38         if (ch == '*' || ch == '/' || ch == '-' || ch == '+' ||
  39                 ch == '(' || ch == ')' || ch == '=' || ch == '^' ||
  40                 ch == '[' || ch == ']' || ch == '<' || ch == '&' ||
  41                 ch == '>' || ch == ',' || ch == '|' || ch == '~' ||
  42                 ch == '%' || ch == ':')
  43                 return true;
  44         return false;
  45 }
  46
  47 static void ColouriseCsoundDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
  48                                 Accessor &styler) {
  49
  50         WordList &opcode = *keywordlists[0];
  51         WordList &headerStmt = *keywordlists[1];
  52         WordList &otherKeyword = *keywordlists[2];
  53
  54         // Do not leak onto next line
  55         if (initStyle == SCE_CSOUND_STRINGEOL)
  56                 initStyle = SCE_CSOUND_DEFAULT;
  57
  58         StyleContext sc(startPos, length, initStyle, styler);
  59
  60         for (; sc.More(); sc.Forward())
  61         {
  62                 // Handle line continuation generically.
  63                 if (sc.ch == '\\') {
  64                         if (sc.chNext == '\n' || sc.chNext == '\r') {
  65                                 sc.Forward();
  66                                 if (sc.ch == '\r' && sc.chNext == '\n') {
  67                                         sc.Forward();
  68                                 }
  69                                 continue;
  70                         }
  71                 }
  72
  73                 // Determine if the current state should terminate.
  74                 if (sc.state == SCE_CSOUND_OPERATOR) {
  75                         if (!IsCsoundOperator(static_cast<char>(sc.ch))) {
  76                             sc.SetState(SCE_CSOUND_DEFAULT);
  77                         }
  78                 }else if (sc.state == SCE_CSOUND_NUMBER) {
  79                         if (!IsAWordChar(sc.ch)) {
  80                                 sc.SetState(SCE_CSOUND_DEFAULT);
  81                         }
  82                 } else if (sc.state == SCE_CSOUND_IDENTIFIER) {
  83                         if (!IsAWordChar(sc.ch) ) {
  84                                 char s[100];
  85                                 sc.GetCurrent(s, sizeof(s));
  86
  87                                 if (opcode.InList(s)) {
  88                                         sc.ChangeState(SCE_CSOUND_OPCODE);
  89                                 } else if (headerStmt.InList(s)) {
  90                                         sc.ChangeState(SCE_CSOUND_HEADERSTMT);
  91                                 } else if (otherKeyword.InList(s)) {
  92                                         sc.ChangeState(SCE_CSOUND_USERKEYWORD);
  93                                 } else if (s[0] == 'p') {
  94                                         sc.ChangeState(SCE_CSOUND_PARAM);
  95                                 } else if (s[0] == 'a') {
  96                                         sc.ChangeState(SCE_CSOUND_ARATE_VAR);
  97                                 } else if (s[0] == 'k') {
  98                                         sc.ChangeState(SCE_CSOUND_KRATE_VAR);
  99                                 } else if (s[0] == 'i') { // covers both i-rate variables and i-statements
 100                                         sc.ChangeState(SCE_CSOUND_IRATE_VAR);
 101                                 } else if (s[0] == 'g') {
 102                                         sc.ChangeState(SCE_CSOUND_GLOBAL_VAR);
 103                                 }
 104                                 sc.SetState(SCE_CSOUND_DEFAULT);
 105                         }
 106                 }
 107                 else if (sc.state == SCE_CSOUND_COMMENT ) {
 108                         if (sc.atLineEnd) {
 109                                 sc.SetState(SCE_CSOUND_DEFAULT);
 110                         }
 111                 }
 112                 else if ((sc.state == SCE_CSOUND_ARATE_VAR) ||
 113                         (sc.state == SCE_CSOUND_KRATE_VAR) ||
 114                 (sc.state == SCE_CSOUND_IRATE_VAR)) {
 115                         if (!IsAWordChar(sc.ch)) {
 116                                 sc.SetState(SCE_CSOUND_DEFAULT);
 117                         }
 118                 }
 119
 120                 // Determine if a new state should be entered.
 121                 if (sc.state == SCE_CSOUND_DEFAULT) {
 122                         if (sc.ch == ';'){
 123                                 sc.SetState(SCE_CSOUND_COMMENT);
 124                         } else if (isdigit(sc.ch) || (sc.ch == '.' && isdigit(sc.chNext))) {
 125                                 sc.SetState(SCE_CSOUND_NUMBER);
 126                         } else if (IsAWordStart(sc.ch)) {
 127                                 sc.SetState(SCE_CSOUND_IDENTIFIER);
 128                         } else if (IsCsoundOperator(static_cast<char>(sc.ch))) {
 129                                 sc.SetState(SCE_CSOUND_OPERATOR);
 130                         } else if (sc.ch == 'p') {
 131                                 sc.SetState(SCE_CSOUND_PARAM);
 132                         } else if (sc.ch == 'a') {
 133                                 sc.SetState(SCE_CSOUND_ARATE_VAR);
 134                         } else if (sc.ch == 'k') {
 135                                 sc.SetState(SCE_CSOUND_KRATE_VAR);
 136                         } else if (sc.ch == 'i') { // covers both i-rate variables and i-statements
 137                                 sc.SetState(SCE_CSOUND_IRATE_VAR);
 138                         } else if (sc.ch == 'g') {
 139                                 sc.SetState(SCE_CSOUND_GLOBAL_VAR);
 140                         }
 141                 }
 142         }
 143         sc.Complete();
 144 }
 145
 146 static void FoldCsoundInstruments(unsigned int startPos, int length, int /* initStyle */, WordList *[],
 147                 Accessor &styler) {
 148         unsigned int lengthDoc = startPos + length;
 149         int visibleChars = 0;
 150         int lineCurrent = styler.GetLine(startPos);
 151         int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
 152         int levelCurrent = levelPrev;
 153         char chNext = styler[startPos];
 154         int stylePrev = 0;
 155         int styleNext = styler.StyleAt(startPos);
 156         for (unsigned int i = startPos; i < lengthDoc; i++) {
 157                 char ch = chNext;
 158                 chNext = styler.SafeGetCharAt(i + 1);
 159                 int style = styleNext;
 160                 styleNext = styler.StyleAt(i + 1);
 161                 bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 162                 if ((stylePrev != SCE_CSOUND_OPCODE) && (style == SCE_CSOUND_OPCODE)) {
 163                         char s[20];
 164                         unsigned int j = 0;
 165                         while ((j < (sizeof(s) - 1)) && (iswordchar(styler[i + j]))) {
 166                                 s[j] = styler[i + j];
 167                                 j++;
 168                         }
 169                         s[j] = '\0';
 170
 171                         if (strcmp(s, "instr") == 0)
 172                                 levelCurrent++;
 173                         if (strcmp(s, "endin") == 0)
 174                                 levelCurrent--;
 175                 }
 176
 177                 if (atEOL) {
 178                         int lev = levelPrev;
 179                         if (visibleChars == 0)
 180                                 lev |= SC_FOLDLEVELWHITEFLAG;
 181                         if ((levelCurrent > levelPrev) && (visibleChars > 0))
 182                                 lev |= SC_FOLDLEVELHEADERFLAG;
 183                         if (lev != styler.LevelAt(lineCurrent)) {
 184                                 styler.SetLevel(lineCurrent, lev);
 185                         }
 186                         lineCurrent++;
 187                         levelPrev = levelCurrent;
 188                         visibleChars = 0;
 189                 }
 190                 if (!isspacechar(ch))
 191                         visibleChars++;
 192                 stylePrev = style;
 193         }
 194         // Fill in the real level of the next line, keeping the current flags as they will be filled in later
 195         int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
 196         styler.SetLevel(lineCurrent, levelPrev | flagsNext);
 197 }
 198
 199
 200 static const char * const csoundWordListDesc[] = {
 201         "Opcodes",
 202         "Header Statements",
 203         "User keywords",
 204         0
 205 };
 206
 207 LexerModule lmCsound(SCLEX_CSOUND, ColouriseCsoundDoc, "csound", FoldCsoundInstruments, csoundWordListDesc);