ext/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 #ifdef SCI_NAMESPACE
  24 using namespace Scintilla;
  25 #endif
  26
  27 static inline bool IsAWordChar(const int ch) {
  28         return (ch < 0x80) && (isalnum(ch) || ch == '.' ||
  29                 ch == '_' || ch == '?');
  30 }
  31
  32 static inline bool IsAWordStart(const int ch) {
  33         return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '.' ||
  34                 ch == '%' || ch == '@' || ch == '$' || ch == '?');
  35 }
  36
  37 static inline bool IsCsoundOperator(char ch) {
  38         if (isalnum(ch))
  39                 return false;
  40         // '.' left out as it is used to make up numbers
  41         if (ch == '*' || ch == '/' || ch == '-' || ch == '+' ||
  42                 ch == '(' || ch == ')' || ch == '=' || ch == '^' ||
  43                 ch == '[' || ch == ']' || ch == '<' || ch == '&' ||
  44                 ch == '>' || ch == ',' || ch == '|' || ch == '~' ||
  45                 ch == '%' || ch == ':')
  46                 return true;
  47         return false;
  48 }
  49
  50 static void ColouriseCsoundDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
  51                                 Accessor &styler) {
  52
  53         WordList &opcode = *keywordlists[0];
  54         WordList &headerStmt = *keywordlists[1];
  55         WordList &otherKeyword = *keywordlists[2];
  56
  57         // Do not leak onto next line
  58         if (initStyle == SCE_CSOUND_STRINGEOL)
  59                 initStyle = SCE_CSOUND_DEFAULT;
  60
  61         StyleContext sc(startPos, length, initStyle, styler);
  62
  63         for (; sc.More(); sc.Forward())
  64         {
  65                 // Handle line continuation generically.
  66                 if (sc.ch == '\\') {
  67                         if (sc.chNext == '\n' || sc.chNext == '\r') {
  68                                 sc.Forward();
  69                                 if (sc.ch == '\r' && sc.chNext == '\n') {
  70                                         sc.Forward();
  71                                 }
  72                                 continue;
  73                         }
  74                 }
  75
  76                 // Determine if the current state should terminate.
  77                 if (sc.state == SCE_CSOUND_OPERATOR) {
  78                         if (!IsCsoundOperator(static_cast<char>(sc.ch))) {
  79                             sc.SetState(SCE_CSOUND_DEFAULT);
  80                         }
  81                 }else if (sc.state == SCE_CSOUND_NUMBER) {
  82                         if (!IsAWordChar(sc.ch)) {
  83                                 sc.SetState(SCE_CSOUND_DEFAULT);
  84                         }
  85                 } else if (sc.state == SCE_CSOUND_IDENTIFIER) {
  86                         if (!IsAWordChar(sc.ch) ) {
  87                                 char s[100];
  88                                 sc.GetCurrent(s, sizeof(s));
  89
  90                                 if (opcode.InList(s)) {
  91                                         sc.ChangeState(SCE_CSOUND_OPCODE);
  92                                 } else if (headerStmt.InList(s)) {
  93                                         sc.ChangeState(SCE_CSOUND_HEADERSTMT);
  94                                 } else if (otherKeyword.InList(s)) {
  95                                         sc.ChangeState(SCE_CSOUND_USERKEYWORD);
  96                                 } else if (s[0] == 'p') {
  97                                         sc.ChangeState(SCE_CSOUND_PARAM);
  98                                 } else if (s[0] == 'a') {
  99                                         sc.ChangeState(SCE_CSOUND_ARATE_VAR);
 100                                 } else if (s[0] == 'k') {
 101                                         sc.ChangeState(SCE_CSOUND_KRATE_VAR);
 102                                 } else if (s[0] == 'i') { // covers both i-rate variables and i-statements
 103                                         sc.ChangeState(SCE_CSOUND_IRATE_VAR);
 104                                 } else if (s[0] == 'g') {
 105                                         sc.ChangeState(SCE_CSOUND_GLOBAL_VAR);
 106                                 }
 107                                 sc.SetState(SCE_CSOUND_DEFAULT);
 108                         }
 109                 }
 110                 else if (sc.state == SCE_CSOUND_COMMENT ) {
 111                         if (sc.atLineEnd) {
 112                                 sc.SetState(SCE_CSOUND_DEFAULT);
 113                         }
 114                 }
 115                 else if ((sc.state == SCE_CSOUND_ARATE_VAR) ||
 116                         (sc.state == SCE_CSOUND_KRATE_VAR) ||
 117                 (sc.state == SCE_CSOUND_IRATE_VAR)) {
 118                         if (!IsAWordChar(sc.ch)) {
 119                                 sc.SetState(SCE_CSOUND_DEFAULT);
 120                         }
 121                 }
 122
 123                 // Determine if a new state should be entered.
 124                 if (sc.state == SCE_CSOUND_DEFAULT) {
 125                         if (sc.ch == ';'){
 126                                 sc.SetState(SCE_CSOUND_COMMENT);
 127                         } else if (isdigit(sc.ch) || (sc.ch == '.' && isdigit(sc.chNext))) {
 128                                 sc.SetState(SCE_CSOUND_NUMBER);
 129                         } else if (IsAWordStart(sc.ch)) {
 130                                 sc.SetState(SCE_CSOUND_IDENTIFIER);
 131                         } else if (IsCsoundOperator(static_cast<char>(sc.ch))) {
 132                                 sc.SetState(SCE_CSOUND_OPERATOR);
 133                         } else if (sc.ch == 'p') {
 134                                 sc.SetState(SCE_CSOUND_PARAM);
 135                         } else if (sc.ch == 'a') {
 136                                 sc.SetState(SCE_CSOUND_ARATE_VAR);
 137                         } else if (sc.ch == 'k') {
 138                                 sc.SetState(SCE_CSOUND_KRATE_VAR);
 139                         } else if (sc.ch == 'i') { // covers both i-rate variables and i-statements
 140                                 sc.SetState(SCE_CSOUND_IRATE_VAR);
 141                         } else if (sc.ch == 'g') {
 142                                 sc.SetState(SCE_CSOUND_GLOBAL_VAR);
 143                         }
 144                 }
 145         }
 146         sc.Complete();
 147 }
 148
 149 static void FoldCsoundInstruments(unsigned int startPos, int length, int /* initStyle */, WordList *[],
 150                 Accessor &styler) {
 151         unsigned int lengthDoc = startPos + length;
 152         int visibleChars = 0;
 153         int lineCurrent = styler.GetLine(startPos);
 154         int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
 155         int levelCurrent = levelPrev;
 156         char chNext = styler[startPos];
 157         int stylePrev = 0;
 158         int styleNext = styler.StyleAt(startPos);
 159         for (unsigned int i = startPos; i < lengthDoc; i++) {
 160                 char ch = chNext;
 161                 chNext = styler.SafeGetCharAt(i + 1);
 162                 int style = styleNext;
 163                 styleNext = styler.StyleAt(i + 1);
 164                 bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 165                 if ((stylePrev != SCE_CSOUND_OPCODE) && (style == SCE_CSOUND_OPCODE)) {
 166                         char s[20];
 167                         unsigned int j = 0;
 168                         while ((j < (sizeof(s) - 1)) && (iswordchar(styler[i + j]))) {
 169                                 s[j] = styler[i + j];
 170                                 j++;
 171                         }
 172                         s[j] = '\0';
 173
 174                         if (strcmp(s, "instr") == 0)
 175                                 levelCurrent++;
 176                         if (strcmp(s, "endin") == 0)
 177                                 levelCurrent--;
 178                 }
 179
 180                 if (atEOL) {
 181                         int lev = levelPrev;
 182                         if (visibleChars == 0)
 183                                 lev |= SC_FOLDLEVELWHITEFLAG;
 184                         if ((levelCurrent > levelPrev) && (visibleChars > 0))
 185                                 lev |= SC_FOLDLEVELHEADERFLAG;
 186                         if (lev != styler.LevelAt(lineCurrent)) {
 187                                 styler.SetLevel(lineCurrent, lev);
 188                         }
 189                         lineCurrent++;
 190                         levelPrev = levelCurrent;
 191                         visibleChars = 0;
 192                 }
 193                 if (!isspacechar(ch))
 194                         visibleChars++;
 195                 stylePrev = style;
 196         }
 197         // Fill in the real level of the next line, keeping the current flags as they will be filled in later
 198         int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
 199         styler.SetLevel(lineCurrent, levelPrev | flagsNext);
 200 }
 201
 202
 203 static const char * const csoundWordListDesc[] = {
 204         "Opcodes",
 205         "Header Statements",
 206         "User keywords",
 207         0
 208 };
 209
 210 LexerModule lmCsound(SCLEX_CSOUND, ColouriseCsoundDoc, "csound", FoldCsoundInstruments, csoundWordListDesc);