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 
IsAWordChar(const int ch)31 static inline bool IsAWordChar(const int ch) {
32 	return (ch < 0x80) && (isalnum(ch) || ch == '.' ||
33 		ch == '_' || ch == '?');
34 }
35 
IsAWordStart(const int ch)36 static inline bool IsAWordStart(const int ch) {
37 	return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '.' ||
38 		ch == '%' || ch == '@' || ch == '$' || ch == '?');
39 }
40 
IsCsoundOperator(char ch)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 
ColouriseCsoundDoc(unsigned int startPos,int length,int initStyle,WordList * keywordlists[],Accessor & styler)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 
FoldCsoundInstruments(unsigned int startPos,int length,int,WordList * [],Accessor & styler)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);
215