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(const VTermState * state,long index,VTermColor * col)36 static void lookup_colour_ansi(const VTermState *state, long index, VTermColor *col)
37 {
38 if(index >= 0 && index < 16) {
39 *col = state->colors[index];
40 }
41 }
42
lookup_colour_palette(const VTermState * state,long index,VTermColor * col)43 static void lookup_colour_palette(const VTermState *state, 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(state, 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(const VTermState * state,int palette,const long args[],int argcount,VTermColor * col,int * index)67 static int lookup_colour(const VTermState *state, 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(state, 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(state, col, colp);
132
133 setpenattr_col(state, attr, *colp);
134 }
135
vterm_state_newpen(VTermState * state)136 INTERNAL void vterm_state_newpen(VTermState *state)
137 {
138 // 90% grey so that pure white is brighter
139 state->default_fg.red = state->default_fg.green = state->default_fg.blue = 240;
140 state->default_bg.red = state->default_bg.green = state->default_bg.blue = 0;
141
142 for(int col = 0; col < 16; col++)
143 state->colors[col] = ansi_colors[col];
144 }
145
vterm_state_resetpen(VTermState * state)146 INTERNAL void vterm_state_resetpen(VTermState *state)
147 {
148 state->pen.bold = 0; setpenattr_bool(state, VTERM_ATTR_BOLD, 0);
149 state->pen.underline = 0; setpenattr_int( state, VTERM_ATTR_UNDERLINE, 0);
150 state->pen.italic = 0; setpenattr_bool(state, VTERM_ATTR_ITALIC, 0);
151 state->pen.blink = 0; setpenattr_bool(state, VTERM_ATTR_BLINK, 0);
152 state->pen.reverse = 0; setpenattr_bool(state, VTERM_ATTR_REVERSE, 0);
153 state->pen.strike = 0; setpenattr_bool(state, VTERM_ATTR_STRIKE, 0);
154 state->pen.font = 0; setpenattr_int( state, VTERM_ATTR_FONT, 0);
155
156 state->fg_index = -1;
157 state->bg_index = -1;
158 state->pen.fg = state->default_fg; setpenattr_col(state, VTERM_ATTR_FOREGROUND, state->default_fg);
159 state->pen.bg = state->default_bg; setpenattr_col(state, VTERM_ATTR_BACKGROUND, state->default_bg);
160 }
161
vterm_state_savepen(VTermState * state,int save)162 INTERNAL void vterm_state_savepen(VTermState *state, int save)
163 {
164 if(save) {
165 state->saved.pen = state->pen;
166 }
167 else {
168 state->pen = state->saved.pen;
169
170 setpenattr_bool(state, VTERM_ATTR_BOLD, state->pen.bold);
171 setpenattr_int( state, VTERM_ATTR_UNDERLINE, state->pen.underline);
172 setpenattr_bool(state, VTERM_ATTR_ITALIC, state->pen.italic);
173 setpenattr_bool(state, VTERM_ATTR_BLINK, state->pen.blink);
174 setpenattr_bool(state, VTERM_ATTR_REVERSE, state->pen.reverse);
175 setpenattr_bool(state, VTERM_ATTR_STRIKE, state->pen.strike);
176 setpenattr_int( state, VTERM_ATTR_FONT, state->pen.font);
177 setpenattr_col( state, VTERM_ATTR_FOREGROUND, state->pen.fg);
178 setpenattr_col( state, VTERM_ATTR_BACKGROUND, state->pen.bg);
179 }
180 }
181
vterm_state_get_default_colors(const VTermState * state,VTermColor * default_fg,VTermColor * default_bg)182 void vterm_state_get_default_colors(const VTermState *state, VTermColor *default_fg, VTermColor *default_bg)
183 {
184 *default_fg = state->default_fg;
185 *default_bg = state->default_bg;
186 }
187
vterm_state_get_palette_color(const VTermState * state,int index,VTermColor * col)188 void vterm_state_get_palette_color(const VTermState *state, int index, VTermColor *col)
189 {
190 lookup_colour_palette(state, index, col);
191 }
192
vterm_state_set_default_colors(VTermState * state,const VTermColor * default_fg,const VTermColor * default_bg)193 void vterm_state_set_default_colors(VTermState *state, const VTermColor *default_fg, const VTermColor *default_bg)
194 {
195 state->default_fg = *default_fg;
196 state->default_bg = *default_bg;
197 }
198
vterm_state_set_palette_color(VTermState * state,int index,const VTermColor * col)199 void vterm_state_set_palette_color(VTermState *state, int index, const VTermColor *col)
200 {
201 if(index >= 0 && index < 16)
202 state->colors[index] = *col;
203 }
204
vterm_state_set_bold_highbright(VTermState * state,int bold_is_highbright)205 void vterm_state_set_bold_highbright(VTermState *state, int bold_is_highbright)
206 {
207 state->bold_is_highbright = bold_is_highbright;
208 }
209
vterm_state_setpen(VTermState * state,const long args[],int argcount)210 INTERNAL void vterm_state_setpen(VTermState *state, const long args[], int argcount)
211 {
212 // SGR - ECMA-48 8.3.117
213
214 int argi = 0;
215 int value;
216
217 while(argi < argcount) {
218 // This logic is easier to do 'done' backwards; set it true, and make it
219 // false again in the 'default' case
220 int done = 1;
221
222 long arg;
223 switch(arg = CSI_ARG(args[argi])) {
224 case CSI_ARG_MISSING:
225 case 0: // Reset
226 vterm_state_resetpen(state);
227 break;
228
229 case 1: // Bold on
230 state->pen.bold = 1;
231 setpenattr_bool(state, VTERM_ATTR_BOLD, 1);
232 if(state->fg_index > -1 && state->fg_index < 8 && state->bold_is_highbright)
233 set_pen_col_ansi(state, VTERM_ATTR_FOREGROUND, state->fg_index + (state->pen.bold ? 8 : 0));
234 break;
235
236 case 3: // Italic on
237 state->pen.italic = 1;
238 setpenattr_bool(state, VTERM_ATTR_ITALIC, 1);
239 break;
240
241 case 4: // Underline single
242 state->pen.underline = 1;
243 setpenattr_int(state, VTERM_ATTR_UNDERLINE, 1);
244 break;
245
246 case 5: // Blink
247 state->pen.blink = 1;
248 setpenattr_bool(state, VTERM_ATTR_BLINK, 1);
249 break;
250
251 case 7: // Reverse on
252 state->pen.reverse = 1;
253 setpenattr_bool(state, VTERM_ATTR_REVERSE, 1);
254 break;
255
256 case 9: // Strikethrough on
257 state->pen.strike = 1;
258 setpenattr_bool(state, VTERM_ATTR_STRIKE, 1);
259 break;
260
261 case 10: case 11: case 12: case 13: case 14:
262 case 15: case 16: case 17: case 18: case 19: // Select font
263 state->pen.font = CSI_ARG(args[argi]) - 10;
264 setpenattr_int(state, VTERM_ATTR_FONT, state->pen.font);
265 break;
266
267 case 21: // Underline double
268 state->pen.underline = 2;
269 setpenattr_int(state, VTERM_ATTR_UNDERLINE, 2);
270 break;
271
272 case 22: // Bold off
273 state->pen.bold = 0;
274 setpenattr_bool(state, VTERM_ATTR_BOLD, 0);
275 break;
276
277 case 23: // Italic and Gothic (currently unsupported) off
278 state->pen.italic = 0;
279 setpenattr_bool(state, VTERM_ATTR_ITALIC, 0);
280 break;
281
282 case 24: // Underline off
283 state->pen.underline = 0;
284 setpenattr_int(state, VTERM_ATTR_UNDERLINE, 0);
285 break;
286
287 case 25: // Blink off
288 state->pen.blink = 0;
289 setpenattr_bool(state, VTERM_ATTR_BLINK, 0);
290 break;
291
292 case 27: // Reverse off
293 state->pen.reverse = 0;
294 setpenattr_bool(state, VTERM_ATTR_REVERSE, 0);
295 break;
296
297 case 29: // Strikethrough off
298 state->pen.strike = 0;
299 setpenattr_bool(state, VTERM_ATTR_STRIKE, 0);
300 break;
301
302 case 30: case 31: case 32: case 33:
303 case 34: case 35: case 36: case 37: // Foreground colour palette
304 value = CSI_ARG(args[argi]) - 30;
305 state->fg_index = value;
306 if(state->pen.bold && state->bold_is_highbright)
307 value += 8;
308 set_pen_col_ansi(state, VTERM_ATTR_FOREGROUND, value);
309 break;
310
311 case 38: // Foreground colour alternative palette
312 state->fg_index = -1;
313 if(argcount - argi < 1)
314 return;
315 argi += 1 + lookup_colour(state, CSI_ARG(args[argi+1]), args+argi+2, argcount-argi-2, &state->pen.fg, &state->fg_index);
316 setpenattr_col(state, VTERM_ATTR_FOREGROUND, state->pen.fg);
317 break;
318
319 case 39: // Foreground colour default
320 state->fg_index = -1;
321 state->pen.fg = state->default_fg;
322 setpenattr_col(state, VTERM_ATTR_FOREGROUND, state->pen.fg);
323 break;
324
325 case 40: case 41: case 42: case 43:
326 case 44: case 45: case 46: case 47: // Background colour palette
327 value = CSI_ARG(args[argi]) - 40;
328 state->bg_index = value;
329 set_pen_col_ansi(state, VTERM_ATTR_BACKGROUND, value);
330 break;
331
332 case 48: // Background colour alternative palette
333 state->bg_index = -1;
334 if(argcount - argi < 1)
335 return;
336 argi += 1 + lookup_colour(state, CSI_ARG(args[argi+1]), args+argi+2, argcount-argi-2, &state->pen.bg, &state->bg_index);
337 setpenattr_col(state, VTERM_ATTR_BACKGROUND, state->pen.bg);
338 break;
339
340 case 49: // Default background
341 state->bg_index = -1;
342 state->pen.bg = state->default_bg;
343 setpenattr_col(state, VTERM_ATTR_BACKGROUND, state->pen.bg);
344 break;
345
346 case 90: case 91: case 92: case 93:
347 case 94: case 95: case 96: case 97: // Foreground colour high-intensity palette
348 value = CSI_ARG(args[argi]) - 90 + 8;
349 state->fg_index = value;
350 set_pen_col_ansi(state, VTERM_ATTR_FOREGROUND, value);
351 break;
352
353 case 100: case 101: case 102: case 103:
354 case 104: case 105: case 106: case 107: // Background colour high-intensity palette
355 value = CSI_ARG(args[argi]) - 100 + 8;
356 state->bg_index = value;
357 set_pen_col_ansi(state, VTERM_ATTR_BACKGROUND, value);
358 break;
359
360 default:
361 done = 0;
362 break;
363 }
364
365 if(!done)
366 fprintf(stderr, "libvterm: Unhandled CSI SGR %lu\n", arg);
367
368 while(CSI_ARG_HAS_MORE(args[argi++]));
369 }
370 }
371
vterm_state_getpen(VTermState * state,long args[],int argcount)372 INTERNAL int vterm_state_getpen(VTermState *state, long args[], int argcount)
373 {
374 int argi = 0;
375
376 if(state->pen.bold)
377 args[argi++] = 1;
378
379 if(state->pen.italic)
380 args[argi++] = 3;
381
382 if(state->pen.underline == 1)
383 args[argi++] = 4;
384
385 if(state->pen.blink)
386 args[argi++] = 5;
387
388 if(state->pen.reverse)
389 args[argi++] = 7;
390
391 if(state->pen.strike)
392 args[argi++] = 9;
393
394 if(state->pen.font)
395 args[argi++] = 10 + state->pen.font;
396
397 if(state->pen.underline == 2)
398 args[argi++] = 21;
399
400 if(state->fg_index >= 0 && state->fg_index < 8)
401 args[argi++] = 30 + state->fg_index;
402 else if(state->fg_index >= 8 && state->fg_index < 16)
403 args[argi++] = 90 + state->fg_index - 8;
404 else if(state->fg_index >= 16 && state->fg_index < 256) {
405 args[argi++] = CSI_ARG_FLAG_MORE|38;
406 args[argi++] = CSI_ARG_FLAG_MORE|5;
407 args[argi++] = state->fg_index;
408 }
409
410 if(state->bg_index >= 0 && state->bg_index < 8)
411 args[argi++] = 40 + state->bg_index;
412 else if(state->bg_index >= 8 && state->bg_index < 16)
413 args[argi++] = 100 + state->bg_index - 8;
414 else if(state->bg_index >= 16 && state->bg_index < 256) {
415 args[argi++] = CSI_ARG_FLAG_MORE|48;
416 args[argi++] = CSI_ARG_FLAG_MORE|5;
417 args[argi++] = state->bg_index;
418 }
419
420 return argi;
421 }
422
vterm_state_get_penattr(const VTermState * state,VTermAttr attr,VTermValue * val)423 int vterm_state_get_penattr(const VTermState *state, VTermAttr attr, VTermValue *val)
424 {
425 switch(attr) {
426 case VTERM_ATTR_BOLD:
427 val->boolean = state->pen.bold;
428 return 1;
429
430 case VTERM_ATTR_UNDERLINE:
431 val->number = state->pen.underline;
432 return 1;
433
434 case VTERM_ATTR_ITALIC:
435 val->boolean = state->pen.italic;
436 return 1;
437
438 case VTERM_ATTR_BLINK:
439 val->boolean = state->pen.blink;
440 return 1;
441
442 case VTERM_ATTR_REVERSE:
443 val->boolean = state->pen.reverse;
444 return 1;
445
446 case VTERM_ATTR_STRIKE:
447 val->boolean = state->pen.strike;
448 return 1;
449
450 case VTERM_ATTR_FONT:
451 val->number = state->pen.font;
452 return 1;
453
454 case VTERM_ATTR_FOREGROUND:
455 val->color = state->pen.fg;
456 return 1;
457
458 case VTERM_ATTR_BACKGROUND:
459 val->color = state->pen.bg;
460 return 1;
461 }
462
463 return 0;
464 }
465