1 #include "vterm_internal.h"
2
3 #include <stdio.h>
4
5 static const VTermColor ansi_colors[] = {
6 /* R G B */
7 { 0, 0, 0 }, // black
8 { 224, 0, 0 }, // red
9 { 0, 224, 0 }, // green
10 { 224, 224, 0 }, // yellow
11 { 0, 0, 224 }, // blue
12 { 224, 0, 224 }, // magenta
13 { 0, 224, 224 }, // cyan
14 { 224, 224, 224 }, // white == light grey
15
16 // high intensity
17 { 128, 128, 128 }, // black
18 { 255, 64, 64 }, // red
19 { 64, 255, 64 }, // green
20 { 255, 255, 64 }, // yellow
21 { 64, 64, 255 }, // blue
22 { 255, 64, 255 }, // magenta
23 { 64, 255, 255 }, // cyan
24 { 255, 255, 255 }, // white for real
25 };
26
27 static int ramp6[] = {
28 0x00, 0x33, 0x66, 0x99, 0xCC, 0xFF,
29 };
30
31 static int ramp24[] = {
32 0x00, 0x0B, 0x16, 0x21, 0x2C, 0x37, 0x42, 0x4D, 0x58, 0x63, 0x6E, 0x79,
33 0x85, 0x90, 0x9B, 0xA6, 0xB1, 0xBC, 0xC7, 0xD2, 0xDD, 0xE8, 0xF3, 0xFF,
34 };
35
lookup_colour_ansi(long index,VTermColor * col)36 static void lookup_colour_ansi(long index, VTermColor *col)
37 {
38 if(index >= 0 && index < 16) {
39 *col = ansi_colors[index];
40 }
41 }
42
lookup_colour_palette(long index,VTermColor * col)43 static void lookup_colour_palette(long index, VTermColor *col)
44 {
45 if(index >= 0 && index < 16) {
46 // Normal 8 colours or high intensity - parse as palette 0
47 lookup_colour_ansi(index, col);
48 }
49 else if(index >= 16 && index < 232) {
50 // 216-colour cube
51 index -= 16;
52
53 col->blue = ramp6[index % 6];
54 col->green = ramp6[index/6 % 6];
55 col->red = ramp6[index/6/6 % 6];
56 }
57 else if(index >= 232 && index < 256) {
58 // 24 greyscales
59 index -= 232;
60
61 col->red = ramp24[index];
62 col->green = ramp24[index];
63 col->blue = ramp24[index];
64 }
65 }
66
lookup_colour(int palette,const long args[],int argcount,VTermColor * col,int * index)67 static int lookup_colour(int palette, const long args[], int argcount, VTermColor *col, int *index)
68 {
69 switch(palette) {
70 case 2: // RGB mode - 3 args contain colour values directly
71 if(argcount < 3)
72 return argcount;
73
74 col->red = CSI_ARG(args[0]);
75 col->green = CSI_ARG(args[1]);
76 col->blue = CSI_ARG(args[2]);
77
78 return 3;
79
80 case 5: // XTerm 256-colour mode
81 if(index)
82 *index = CSI_ARG_OR(args[0], -1);
83
84 lookup_colour_palette(argcount ? CSI_ARG_OR(args[0], -1) : -1, col);
85
86 return argcount ? 1 : 0;
87
88 default:
89 fprintf(stderr, "Unrecognised colour palette %d\n", palette);
90 return 0;
91 }
92 }
93
94 // Some conveniences
95
setpenattr(VTermState * state,VTermAttr attr,VTermValueType type,VTermValue * val)96 static void setpenattr(VTermState *state, VTermAttr attr, VTermValueType type, VTermValue *val)
97 {
98 #ifdef DEBUG
99 if(type != vterm_get_attr_type(attr)) {
100 fprintf(stderr, "Cannot set attr %d as it has type %d, not type %d\n",
101 attr, vterm_get_attr_type(attr), type);
102 return;
103 }
104 #endif
105 if(state->callbacks && state->callbacks->setpenattr)
106 (*state->callbacks->setpenattr)(attr, val, state->cbdata);
107 }
108
setpenattr_bool(VTermState * state,VTermAttr attr,int boolean)109 static void setpenattr_bool(VTermState *state, VTermAttr attr, int boolean)
110 {
111 VTermValue val = { .boolean = boolean };
112 setpenattr(state, attr, VTERM_VALUETYPE_BOOL, &val);
113 }
114
setpenattr_int(VTermState * state,VTermAttr attr,int number)115 static void setpenattr_int(VTermState *state, VTermAttr attr, int number)
116 {
117 VTermValue val = { .number = number };
118 setpenattr(state, attr, VTERM_VALUETYPE_INT, &val);
119 }
120
setpenattr_col(VTermState * state,VTermAttr attr,VTermColor color)121 static void setpenattr_col(VTermState *state, VTermAttr attr, VTermColor color)
122 {
123 VTermValue val = { .color = color };
124 setpenattr(state, attr, VTERM_VALUETYPE_COLOR, &val);
125 }
126
set_pen_col_ansi(VTermState * state,VTermAttr attr,long col)127 static void set_pen_col_ansi(VTermState *state, VTermAttr attr, long col)
128 {
129 VTermColor *colp = (attr == VTERM_ATTR_BACKGROUND) ? &state->pen.bg : &state->pen.fg;
130
131 lookup_colour_ansi(col, colp);
132
133 setpenattr_col(state, attr, *colp);
134 }
135
vterm_state_resetpen(VTermState * state)136 void vterm_state_resetpen(VTermState *state)
137 {
138 state->pen.bold = 0; setpenattr_bool(state, VTERM_ATTR_BOLD, 0);
139 state->pen.underline = 0; setpenattr_int( state, VTERM_ATTR_UNDERLINE, 0);
140 state->pen.italic = 0; setpenattr_bool(state, VTERM_ATTR_ITALIC, 0);
141 state->pen.blink = 0; setpenattr_bool(state, VTERM_ATTR_BLINK, 0);
142 state->pen.reverse = 0; setpenattr_bool(state, VTERM_ATTR_REVERSE, 0);
143 state->pen.strike = 0; setpenattr_bool(state, VTERM_ATTR_STRIKE, 0);
144 state->pen.font = 0; setpenattr_int( state, VTERM_ATTR_FONT, 0);
145
146 state->fg_index = -1;
147 state->bg_index = -1;
148 state->pen.fg = state->default_fg; setpenattr_col(state, VTERM_ATTR_FOREGROUND, state->default_fg);
149 state->pen.bg = state->default_bg; setpenattr_col(state, VTERM_ATTR_BACKGROUND, state->default_bg);
150 }
151
vterm_state_savepen(VTermState * state,int save)152 void vterm_state_savepen(VTermState *state, int save)
153 {
154 if(save) {
155 state->saved.pen = state->pen;
156 }
157 else {
158 state->pen = state->saved.pen;
159
160 setpenattr_bool(state, VTERM_ATTR_BOLD, state->pen.bold);
161 setpenattr_int( state, VTERM_ATTR_UNDERLINE, state->pen.underline);
162 setpenattr_bool(state, VTERM_ATTR_ITALIC, state->pen.italic);
163 setpenattr_bool(state, VTERM_ATTR_BLINK, state->pen.blink);
164 setpenattr_bool(state, VTERM_ATTR_REVERSE, state->pen.reverse);
165 setpenattr_bool(state, VTERM_ATTR_STRIKE, state->pen.strike);
166 setpenattr_int( state, VTERM_ATTR_FONT, state->pen.font);
167 setpenattr_col( state, VTERM_ATTR_FOREGROUND, state->pen.fg);
168 setpenattr_col( state, VTERM_ATTR_BACKGROUND, state->pen.bg);
169 }
170 }
171
vterm_state_get_default_colors(const VTermState * state,VTermColor * default_fg,VTermColor * default_bg)172 void vterm_state_get_default_colors(const VTermState *state, VTermColor *default_fg, VTermColor *default_bg)
173 {
174 *default_fg = state->default_fg;
175 *default_bg = state->default_bg;
176 }
177
vterm_state_get_palette_color(const VTermState * state,int index,VTermColor * col)178 void vterm_state_get_palette_color(const VTermState *state, int index, VTermColor *col)
179 {
180 lookup_colour_palette(index, col);
181 }
182
vterm_state_set_default_colors(VTermState * state,const VTermColor * default_fg,const VTermColor * default_bg)183 void vterm_state_set_default_colors(VTermState *state, const VTermColor *default_fg, const VTermColor *default_bg)
184 {
185 state->default_fg = *default_fg;
186 state->default_bg = *default_bg;
187 }
188
vterm_state_set_bold_highbright(VTermState * state,int bold_is_highbright)189 void vterm_state_set_bold_highbright(VTermState *state, int bold_is_highbright)
190 {
191 state->bold_is_highbright = bold_is_highbright;
192 }
193
vterm_state_setpen(VTermState * state,const long args[],int argcount)194 void vterm_state_setpen(VTermState *state, const long args[], int argcount)
195 {
196 // SGR - ECMA-48 8.3.117
197
198 int argi = 0;
199 int value;
200
201 while(argi < argcount) {
202 // This logic is easier to do 'done' backwards; set it true, and make it
203 // false again in the 'default' case
204 int done = 1;
205
206 long arg;
207 switch(arg = CSI_ARG(args[argi])) {
208 case CSI_ARG_MISSING:
209 case 0: // Reset
210 vterm_state_resetpen(state);
211 break;
212
213 case 1: // Bold on
214 state->pen.bold = 1;
215 setpenattr_bool(state, VTERM_ATTR_BOLD, 1);
216 if(state->fg_index > -1 && state->fg_index < 8 && state->bold_is_highbright)
217 set_pen_col_ansi(state, VTERM_ATTR_FOREGROUND, state->fg_index + (state->pen.bold ? 8 : 0));
218 break;
219
220 case 3: // Italic on
221 state->pen.italic = 1;
222 setpenattr_bool(state, VTERM_ATTR_ITALIC, 1);
223 break;
224
225 case 4: // Underline single
226 state->pen.underline = 1;
227 setpenattr_int(state, VTERM_ATTR_UNDERLINE, 1);
228 break;
229
230 case 5: // Blink
231 state->pen.blink = 1;
232 setpenattr_bool(state, VTERM_ATTR_BLINK, 1);
233 break;
234
235 case 7: // Reverse on
236 state->pen.reverse = 1;
237 setpenattr_bool(state, VTERM_ATTR_REVERSE, 1);
238 break;
239
240 case 9: // Strikethrough on
241 state->pen.strike = 1;
242 setpenattr_bool(state, VTERM_ATTR_STRIKE, 1);
243 break;
244
245 case 10: case 11: case 12: case 13: case 14:
246 case 15: case 16: case 17: case 18: case 19: // Select font
247 state->pen.font = CSI_ARG(args[argi]) - 10;
248 setpenattr_int(state, VTERM_ATTR_FONT, state->pen.font);
249 break;
250
251 case 21: // Underline double
252 state->pen.underline = 2;
253 setpenattr_int(state, VTERM_ATTR_UNDERLINE, 2);
254 break;
255
256 case 22: // Bold off
257 state->pen.bold = 0;
258 setpenattr_bool(state, VTERM_ATTR_BOLD, 0);
259 break;
260
261 case 23: // Italic and Gothic (currently unsupported) off
262 state->pen.italic = 0;
263 setpenattr_bool(state, VTERM_ATTR_ITALIC, 0);
264 break;
265
266 case 24: // Underline off
267 state->pen.underline = 0;
268 setpenattr_int(state, VTERM_ATTR_UNDERLINE, 0);
269 break;
270
271 case 25: // Blink off
272 state->pen.blink = 0;
273 setpenattr_bool(state, VTERM_ATTR_BLINK, 0);
274 break;
275
276 case 27: // Reverse off
277 state->pen.reverse = 0;
278 setpenattr_bool(state, VTERM_ATTR_REVERSE, 0);
279 break;
280
281 case 29: // Strikethrough off
282 state->pen.strike = 0;
283 setpenattr_bool(state, VTERM_ATTR_STRIKE, 0);
284 break;
285
286 case 30: case 31: case 32: case 33:
287 case 34: case 35: case 36: case 37: // Foreground colour palette
288 value = CSI_ARG(args[argi]) - 30;
289 state->fg_index = value;
290 if(state->pen.bold && state->bold_is_highbright)
291 value += 8;
292 set_pen_col_ansi(state, VTERM_ATTR_FOREGROUND, value);
293 break;
294
295 case 38: // Foreground colour alternative palette
296 state->fg_index = -1;
297 if(argcount - argi < 1)
298 return;
299 argi += 1 + lookup_colour(CSI_ARG(args[argi+1]), args+argi+2, argcount-argi-2, &state->pen.fg, &state->fg_index);
300 setpenattr_col(state, VTERM_ATTR_FOREGROUND, state->pen.fg);
301 break;
302
303 case 39: // Foreground colour default
304 state->fg_index = -1;
305 state->pen.fg = state->default_fg;
306 setpenattr_col(state, VTERM_ATTR_FOREGROUND, state->pen.fg);
307 break;
308
309 case 40: case 41: case 42: case 43:
310 case 44: case 45: case 46: case 47: // Background colour palette
311 value = CSI_ARG(args[argi]) - 40;
312 state->bg_index = value;
313 set_pen_col_ansi(state, VTERM_ATTR_BACKGROUND, value);
314 break;
315
316 case 48: // Background colour alternative palette
317 state->bg_index = -1;
318 if(argcount - argi < 1)
319 return;
320 argi += 1 + lookup_colour(CSI_ARG(args[argi+1]), args+argi+2, argcount-argi-2, &state->pen.bg, &state->bg_index);
321 setpenattr_col(state, VTERM_ATTR_BACKGROUND, state->pen.bg);
322 break;
323
324 case 49: // Default background
325 state->bg_index = -1;
326 state->pen.bg = state->default_bg;
327 setpenattr_col(state, VTERM_ATTR_BACKGROUND, state->pen.bg);
328 break;
329
330 case 90: case 91: case 92: case 93:
331 case 94: case 95: case 96: case 97: // Foreground colour high-intensity palette
332 value = CSI_ARG(args[argi]) - 90 + 8;
333 state->fg_index = value;
334 set_pen_col_ansi(state, VTERM_ATTR_FOREGROUND, value);
335 break;
336
337 case 100: case 101: case 102: case 103:
338 case 104: case 105: case 106: case 107: // Background colour high-intensity palette
339 value = CSI_ARG(args[argi]) - 100 + 8;
340 state->bg_index = value;
341 set_pen_col_ansi(state, VTERM_ATTR_BACKGROUND, value);
342 break;
343
344 default:
345 done = 0;
346 break;
347 }
348
349 if(!done)
350 fprintf(stderr, "libvterm: Unhandled CSI SGR %lu\n", arg);
351
352 while(CSI_ARG_HAS_MORE(args[argi++]));
353 }
354 }
355
vterm_state_getpen(VTermState * state,long args[],int argcount)356 int vterm_state_getpen(VTermState *state, long args[], int argcount)
357 {
358 int argi = 0;
359
360 if(state->pen.bold)
361 args[argi++] = 1;
362
363 if(state->pen.italic)
364 args[argi++] = 3;
365
366 if(state->pen.underline == 1)
367 args[argi++] = 4;
368
369 if(state->pen.blink)
370 args[argi++] = 5;
371
372 if(state->pen.reverse)
373 args[argi++] = 7;
374
375 if(state->pen.strike)
376 args[argi++] = 9;
377
378 if(state->pen.font)
379 args[argi++] = 10 + state->pen.font;
380
381 if(state->pen.underline == 2)
382 args[argi++] = 21;
383
384 if(state->fg_index >= 0 && state->fg_index < 8)
385 args[argi++] = 30 + state->fg_index;
386 else if(state->fg_index >= 8 && state->fg_index < 16)
387 args[argi++] = 90 + state->fg_index - 8;
388 else if(state->fg_index >= 16 && state->fg_index < 256) {
389 args[argi++] = CSI_ARG_FLAG_MORE|38;
390 args[argi++] = CSI_ARG_FLAG_MORE|5;
391 args[argi++] = state->fg_index;
392 }
393
394 if(state->bg_index >= 0 && state->bg_index < 8)
395 args[argi++] = 40 + state->bg_index;
396 else if(state->bg_index >= 8 && state->bg_index < 16)
397 args[argi++] = 100 + state->bg_index - 8;
398 else if(state->bg_index >= 16 && state->bg_index < 256) {
399 args[argi++] = CSI_ARG_FLAG_MORE|48;
400 args[argi++] = CSI_ARG_FLAG_MORE|5;
401 args[argi++] = state->bg_index;
402 }
403
404 return argi;
405 }
406
vterm_state_get_penattr(const VTermState * state,VTermAttr attr,VTermValue * val)407 int vterm_state_get_penattr(const VTermState *state, VTermAttr attr, VTermValue *val)
408 {
409 switch(attr) {
410 case VTERM_ATTR_BOLD:
411 val->boolean = state->pen.bold;
412 return 1;
413
414 case VTERM_ATTR_UNDERLINE:
415 val->number = state->pen.underline;
416 return 1;
417
418 case VTERM_ATTR_ITALIC:
419 val->boolean = state->pen.italic;
420 return 1;
421
422 case VTERM_ATTR_BLINK:
423 val->boolean = state->pen.blink;
424 return 1;
425
426 case VTERM_ATTR_REVERSE:
427 val->boolean = state->pen.reverse;
428 return 1;
429
430 case VTERM_ATTR_STRIKE:
431 val->boolean = state->pen.strike;
432 return 1;
433
434 case VTERM_ATTR_FONT:
435 val->number = state->pen.font;
436 return 1;
437
438 case VTERM_ATTR_FOREGROUND:
439 val->color = state->pen.fg;
440 return 1;
441
442 case VTERM_ATTR_BACKGROUND:
443 val->color = state->pen.bg;
444 return 1;
445 }
446
447 return 0;
448 }
449