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2010-05-16 Import Scintilla 2.11
1 // Scintilla source code edit control
2 // @file LexPB.cxx
3 // Lexer for PowerBasic by Roland Walter, roland@rowalt.de (for PowerBasic see www.powerbasic.com)
4 //
5 // Changes:
6 // 17.10.2003: Toggling of subs/functions now until next sub/function - this gives better results
7 // 29.10.2003: 1. Bug: Toggling didn't work for subs/functions added in editor
8 // 2. Own colors for PB constants and Inline Assembler SCE_B_CONSTANT and SCE_B_ASM
9 // 3. Several smaller syntax coloring improvements and speed optimizations
10 // 12.07.2004: 1. Toggling for macros added
11 // 2. Further folding speed optimitations (for people dealing with very large listings)
12 //
13 // Necessary changes for the PB lexer in Scintilla project:
14 // - In SciLexer.h and Scintilla.iface:
15 //
16 // #define SCLEX_POWERBASIC 51 //ID for PowerBasic lexer
17 // (...)
18 // #define SCE_B_DEFAULT 0 //in both VB and PB lexer
19 // #define SCE_B_COMMENT 1 //in both VB and PB lexer
20 // #define SCE_B_NUMBER 2 //in both VB and PB lexer
21 // #define SCE_B_KEYWORD 3 //in both VB and PB lexer
22 // #define SCE_B_STRING 4 //in both VB and PB lexer
23 // #define SCE_B_PREPROCESSOR 5 //VB lexer only, not in PB lexer
24 // #define SCE_B_OPERATOR 6 //in both VB and PB lexer
25 // #define SCE_B_IDENTIFIER 7 //in both VB and PB lexer
26 // #define SCE_B_DATE 8 //VB lexer only, not in PB lexer
27 // #define SCE_B_CONSTANT 13 //PB lexer only, not in VB lexer
28 // #define SCE_B_ASM 14 //PB lexer only, not in VB lexer
29
30 // - Statement added to KeyWords.cxx: 'LINK_LEXER(lmPB);'
31 // - Statement added to scintilla_vc6.mak: '$(DIR_O)\LexPB.obj: ...\src\LexPB.cxx $(LEX_HEADERS)'
32 //
33 // Copyright for Scintilla: 1998-2001 by Neil Hodgson <neilh@scintilla.org>
34 // The License.txt file describes the conditions under which this software may be distributed.
35
36 #include <stdlib.h>
37 #include <string.h>
38 #include <ctype.h>
39 #include <stdio.h>
40 #include <stdarg.h>
41
42 #include "Platform.h"
43
44 #include "PropSet.h"
45 #include "Accessor.h"
46 #include "StyleContext.h"
47 #include "KeyWords.h"
48 #include "Scintilla.h"
49 #include "SciLexer.h"
50
51 #ifdef SCI_NAMESPACE
52 using namespace Scintilla;
53 #endif
54
55 static inline bool IsTypeCharacter(const int ch)
56 {
57 return ch == '%' || ch == '&' || ch == '@' || ch == '!' || ch == '#' || ch == '$' || ch == '?';
58 }
59
60 static inline bool IsAWordChar(const int ch)
61 {
62 return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
63 }
64
65 static inline bool IsAWordStart(const int ch)
66 {
67 return (ch < 0x80) && (isalnum(ch) || ch == '_');
68 }
69
70 bool MatchUpperCase(Accessor &styler, int pos, const char *s) //Same as styler.Match() but uppercase comparison (a-z,A-Z and space only)
71 {
72 char ch;
73 for (int i=0; *s; i++)
74 {
75 ch=styler.SafeGetCharAt(pos+i);
76 if (ch > 0x60) ch -= '\x20';
77 if (*s != ch) return false;
78 s++;
79 }
80 return true;
81 }
82
83 static void ColourisePBDoc(unsigned int startPos, int length, int initStyle,WordList *keywordlists[],Accessor &styler) {
84
85 WordList &keywords = *keywordlists[0];
86
87 styler.StartAt(startPos);
88
89 StyleContext sc(startPos, length, initStyle, styler);
90
91 for (; sc.More(); sc.Forward()) {
92 switch (sc.state)
93 {
94 case SCE_B_OPERATOR:
95 {
96 sc.SetState(SCE_B_DEFAULT);
97 break;
98 }
99 case SCE_B_KEYWORD:
100 {
101 if (!IsAWordChar(sc.ch))
102 {
103 if (!IsTypeCharacter(sc.ch))
104 {
105 char s[100];
106 sc.GetCurrentLowered(s, sizeof(s));
107 if (keywords.InList(s))
108 {
109 if (strcmp(s, "rem") == 0)
110 {
111 sc.ChangeState(SCE_B_COMMENT);
112 if (sc.atLineEnd) {sc.SetState(SCE_B_DEFAULT);}
113 }
114 else if (strcmp(s, "asm") == 0)
115 {
116 sc.ChangeState(SCE_B_ASM);
117 if (sc.atLineEnd) {sc.SetState(SCE_B_DEFAULT);}
118 }
119 else
120 {
121 sc.SetState(SCE_B_DEFAULT);
122 }
123 }
124 else
125 {
126 sc.ChangeState(SCE_B_IDENTIFIER);
127 sc.SetState(SCE_B_DEFAULT);
128 }
129 }
130 }
131 break;
132 }
133 case SCE_B_NUMBER:
134 {
135 if (!IsAWordChar(sc.ch)) {sc.SetState(SCE_B_DEFAULT);}
136 break;
137 }
138 case SCE_B_STRING:
139 {
140 if (sc.ch == '\"'){sc.ForwardSetState(SCE_B_DEFAULT);}
141 break;
142 }
143 case SCE_B_CONSTANT:
144 {
145 if (!IsAWordChar(sc.ch)) {sc.SetState(SCE_B_DEFAULT);}
146 break;
147 }
148 case SCE_B_COMMENT:
149 {
150 if (sc.atLineEnd) {sc.SetState(SCE_B_DEFAULT);}
151 break;
152 }
153 case SCE_B_ASM:
154 {
155 if (sc.atLineEnd) {sc.SetState(SCE_B_DEFAULT);}
156 break;
157 }
158 } //switch (sc.state)
159
160 // Determine if a new state should be entered:
161 if (sc.state == SCE_B_DEFAULT)
162 {
163 if (sc.ch == '\'') {sc.SetState(SCE_B_COMMENT);}
164 else if (sc.ch == '\"') {sc.SetState(SCE_B_STRING);}
165 else if (sc.ch == '&' && tolower(sc.chNext) == 'h') {sc.SetState(SCE_B_NUMBER);}
166 else if (sc.ch == '&' && tolower(sc.chNext) == 'b') {sc.SetState(SCE_B_NUMBER);}
167 else if (sc.ch == '&' && tolower(sc.chNext) == 'o') {sc.SetState(SCE_B_NUMBER);}
168 else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {sc.SetState(SCE_B_NUMBER);}
169 else if (IsAWordStart(sc.ch)) {sc.SetState(SCE_B_KEYWORD);}
170 else if (sc.ch == '%') {sc.SetState(SCE_B_CONSTANT);}
171 else if (sc.ch == '$') {sc.SetState(SCE_B_CONSTANT);}
172 else if (sc.ch == '#') {sc.SetState(SCE_B_KEYWORD);}
173 else if (sc.ch == '!') {sc.SetState(SCE_B_ASM);}
174 else if (isoperator(static_cast<char>(sc.ch)) || (sc.ch == '\\')) {sc.SetState(SCE_B_OPERATOR);}
175 }
176 } //for (; sc.More(); sc.Forward())
177 sc.Complete();
178 }
179
180 //The folding routine for PowerBasic toggles SUBs and FUNCTIONs only. This was exactly what I wanted,
181 //nothing more. I had worked with this kind of toggling for several years when I used the great good old
182 //GFA Basic which is dead now. After testing the feature of toggling FOR-NEXT loops, WHILE-WEND loops
183 //and so on too I found this is more disturbing then helping (for me). So if You think in another way
184 //you can (or must) write Your own toggling routine ;-)
185 static void FoldPBDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler)
186 {
187 // No folding enabled, no reason to continue...
188 if( styler.GetPropertyInt("fold") == 0 )
189 return;
190
191 unsigned int endPos = startPos + length;
192 int lineCurrent = styler.GetLine(startPos);
193 int levelCurrent = SC_FOLDLEVELBASE;
194 if (lineCurrent > 0)
195 levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
196 int levelNext = levelCurrent;
197 char chNext = styler[startPos];
198
199 bool fNewLine=true;
200 bool fMightBeMultiLineMacro=false;
201 bool fBeginOfCommentFound=false;
202 for (unsigned int i = startPos; i < endPos; i++)
203 {
204 char ch = chNext;
205 chNext = styler.SafeGetCharAt(i + 1);
206
207 if (fNewLine) //Begin of a new line (The Sub/Function/Macro keywords may occur at begin of line only)
208 {
209 fNewLine=false;
210 fBeginOfCommentFound=false;
211 switch (ch)
212 {
213 case ' ': //Most lines start with space - so check this first, the code is the same as for 'default:'
214 case '\t': //Handle tab too
215 {
216 int levelUse = levelCurrent;
217 int lev = levelUse | levelNext << 16;
218 styler.SetLevel(lineCurrent, lev);
219 break;
220 }
221 case 'F':
222 case 'f':
223 {
224 switch (chNext)
225 {
226 case 'U':
227 case 'u':
228 {
229 if( MatchUpperCase(styler,i,"FUNCTION") )
230 {
231 styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
232 levelNext=SC_FOLDLEVELBASE+1;
233 }
234 break;
235 }
236 }
237 break;
238 }
239 case 'S':
240 case 's':
241 {
242 switch (chNext)
243 {
244 case 'U':
245 case 'u':
246 {
247 if( MatchUpperCase(styler,i,"SUB") )
248 {
249 styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
250 levelNext=SC_FOLDLEVELBASE+1;
251 }
252 break;
253 }
254 case 'T':
255 case 't':
256 {
257 if( MatchUpperCase(styler,i,"STATIC FUNCTION") )
258 {
259 styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
260 levelNext=SC_FOLDLEVELBASE+1;
261 }
262 else if( MatchUpperCase(styler,i,"STATIC SUB") )
263 {
264 styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
265 levelNext=SC_FOLDLEVELBASE+1;
266 }
267 break;
268 }
269 }
270 break;
271 }
272 case 'C':
273 case 'c':
274 {
275 switch (chNext)
276 {
277 case 'A':
278 case 'a':
279 {
280 if( MatchUpperCase(styler,i,"CALLBACK FUNCTION") )
281 {
282 styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
283 levelNext=SC_FOLDLEVELBASE+1;
284 }
285 break;
286 }
287 }
288 break;
289 }
290 case 'M':
291 case 'm':
292 {
293 switch (chNext)
294 {
295 case 'A':
296 case 'a':
297 {
298 if( MatchUpperCase(styler,i,"MACRO") )
299 {
300 fMightBeMultiLineMacro=true; //Set folder level at end of line, we have to check for single line macro
301 }
302 break;
303 }
304 }
305 break;
306 }
307 default:
308 {
309 int levelUse = levelCurrent;
310 int lev = levelUse | levelNext << 16;
311 styler.SetLevel(lineCurrent, lev);
312 break;
313 }
314 } //switch (ch)
315 } //if( fNewLine )
316
317 switch (ch)
318 {
319 case '=': //To test single line macros
320 {
321 if (fBeginOfCommentFound==false)
322 fMightBeMultiLineMacro=false; //The found macro is a single line macro only;
323 break;
324 }
325 case '\'': //A comment starts
326 {
327 fBeginOfCommentFound=true;
328 break;
329 }
330 case '\n':
331 {
332 if (fMightBeMultiLineMacro) //The current line is the begin of a multi line macro
333 {
334 fMightBeMultiLineMacro=false;
335 styler.SetLevel(lineCurrent, (SC_FOLDLEVELBASE << 16) | SC_FOLDLEVELHEADERFLAG);
336 levelNext=SC_FOLDLEVELBASE+1;
337 }
338 lineCurrent++;
339 levelCurrent = levelNext;
340 fNewLine=true;
341 break;
342 }
343 case '\r':
344 {
345 if (chNext != '\n')
346 {
347 lineCurrent++;
348 levelCurrent = levelNext;
349 fNewLine=true;
350 }
351 break;
352 }
353 } //switch (ch)
354 } //for (unsigned int i = startPos; i < endPos; i++)
355 }
356
357 static const char * const pbWordListDesc[] = {
358 "Keywords",
359 0
360 };
361
362 LexerModule lmPB(SCLEX_POWERBASIC, ColourisePBDoc, "powerbasic", FoldPBDoc, pbWordListDesc);
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