1/*
2 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
3 * Released under the terms of the GNU GPL v2.0.
4 */
5
6#include <ctype.h>
7#include <stdarg.h>
8#include <stdlib.h>
9#include <string.h>
10
11#include "lkc.h"
12
13static const char nohelp_text[] = "There is no help available for this option.";
14
15struct menu rootmenu;
16static struct menu **last_entry_ptr;
17
18struct file *file_list;
19struct file *current_file;
20
21void menu_warn(struct menu *menu, const char *fmt, ...)
22{
23	va_list ap;
24	va_start(ap, fmt);
25	fprintf(stderr, "%s:%d:warning: ", menu->file->name, menu->lineno);
26	vfprintf(stderr, fmt, ap);
27	fprintf(stderr, "\n");
28	va_end(ap);
29}
30
31static void prop_warn(struct property *prop, const char *fmt, ...)
32{
33	va_list ap;
34	va_start(ap, fmt);
35	fprintf(stderr, "%s:%d:warning: ", prop->file->name, prop->lineno);
36	vfprintf(stderr, fmt, ap);
37	fprintf(stderr, "\n");
38	va_end(ap);
39}
40
41void _menu_init(void)
42{
43	current_entry = current_menu = &rootmenu;
44	last_entry_ptr = &rootmenu.list;
45}
46
47void menu_add_entry(struct symbol *sym)
48{
49	struct menu *menu;
50
51	menu = xmalloc(sizeof(*menu));
52	memset(menu, 0, sizeof(*menu));
53	menu->sym = sym;
54	menu->parent = current_menu;
55	menu->file = current_file;
56	menu->lineno = zconf_lineno();
57
58	*last_entry_ptr = menu;
59	last_entry_ptr = &menu->next;
60	current_entry = menu;
61	if (sym)
62		menu_add_symbol(P_SYMBOL, sym, NULL);
63}
64
65void menu_end_entry(void)
66{
67}
68
69struct menu *menu_add_menu(void)
70{
71	menu_end_entry();
72	last_entry_ptr = &current_entry->list;
73	return current_menu = current_entry;
74}
75
76void menu_end_menu(void)
77{
78	last_entry_ptr = &current_menu->next;
79	current_menu = current_menu->parent;
80}
81
82static struct expr *menu_check_dep(struct expr *e)
83{
84	if (!e)
85		return e;
86
87	switch (e->type) {
88	case E_NOT:
89		e->left.expr = menu_check_dep(e->left.expr);
90		break;
91	case E_OR:
92	case E_AND:
93		e->left.expr = menu_check_dep(e->left.expr);
94		e->right.expr = menu_check_dep(e->right.expr);
95		break;
96	case E_SYMBOL:
97		/* change 'm' into 'm' && MODULES */
98		if (e->left.sym == &symbol_mod)
99			return expr_alloc_and(e, expr_alloc_symbol(modules_sym));
100		break;
101	default:
102		break;
103	}
104	return e;
105}
106
107void menu_add_dep(struct expr *dep)
108{
109	current_entry->dep = expr_alloc_and(current_entry->dep, menu_check_dep(dep));
110}
111
112void menu_set_type(int type)
113{
114	struct symbol *sym = current_entry->sym;
115
116	if (sym->type == type)
117		return;
118	if (sym->type == S_UNKNOWN) {
119		sym->type = type;
120		return;
121	}
122	menu_warn(current_entry,
123		"ignoring type redefinition of '%s' from '%s' to '%s'",
124		sym->name ? sym->name : "<choice>",
125		sym_type_name(sym->type), sym_type_name(type));
126}
127
128struct property *menu_add_prop(enum prop_type type, char *prompt, struct expr *expr, struct expr *dep)
129{
130	struct property *prop = prop_alloc(type, current_entry->sym);
131
132	prop->menu = current_entry;
133	prop->expr = expr;
134	prop->visible.expr = menu_check_dep(dep);
135
136	if (prompt) {
137		if (isspace(*prompt)) {
138			prop_warn(prop, "leading whitespace ignored");
139			while (isspace(*prompt))
140				prompt++;
141		}
142		if (current_entry->prompt && current_entry != &rootmenu)
143			prop_warn(prop, "prompt redefined");
144
145		/* Apply all upper menus' visibilities to actual prompts. */
146		if(type == P_PROMPT) {
147			struct menu *menu = current_entry;
148
149			while ((menu = menu->parent) != NULL) {
150				struct expr *dup_expr;
151
152				if (!menu->visibility)
153					continue;
154				/*
155				 * Do not add a reference to the
156				 * menu's visibility expression but
157				 * use a copy of it.  Otherwise the
158				 * expression reduction functions
159				 * will modify expressions that have
160				 * multiple references which can
161				 * cause unwanted side effects.
162				 */
163				dup_expr = expr_copy(menu->visibility);
164
165				prop->visible.expr
166					= expr_alloc_and(prop->visible.expr,
167							 dup_expr);
168			}
169		}
170
171		current_entry->prompt = prop;
172	}
173	prop->text = prompt;
174
175	return prop;
176}
177
178struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr *dep)
179{
180	return menu_add_prop(type, prompt, NULL, dep);
181}
182
183void menu_add_visibility(struct expr *expr)
184{
185	current_entry->visibility = expr_alloc_and(current_entry->visibility,
186	    expr);
187}
188
189void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep)
190{
191	menu_add_prop(type, NULL, expr, dep);
192}
193
194void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep)
195{
196	menu_add_prop(type, NULL, expr_alloc_symbol(sym), dep);
197}
198
199void menu_add_option(int token, char *arg)
200{
201	switch (token) {
202	case T_OPT_MODULES:
203		if (modules_sym)
204			zconf_error("symbol '%s' redefines option 'modules'"
205				    " already defined by symbol '%s'",
206				    current_entry->sym->name,
207				    modules_sym->name
208				    );
209		modules_sym = current_entry->sym;
210		break;
211	case T_OPT_DEFCONFIG_LIST:
212		if (!sym_defconfig_list)
213			sym_defconfig_list = current_entry->sym;
214		else if (sym_defconfig_list != current_entry->sym)
215			zconf_error("trying to redefine defconfig symbol");
216		break;
217	case T_OPT_ENV:
218		prop_add_env(arg);
219		break;
220	case T_OPT_ALLNOCONFIG_Y:
221		current_entry->sym->flags |= SYMBOL_ALLNOCONFIG_Y;
222		break;
223	}
224}
225
226static int menu_validate_number(struct symbol *sym, struct symbol *sym2)
227{
228	return sym2->type == S_INT || sym2->type == S_HEX ||
229	       (sym2->type == S_UNKNOWN && sym_string_valid(sym, sym2->name));
230}
231
232static void sym_check_prop(struct symbol *sym)
233{
234	struct property *prop;
235	struct symbol *sym2;
236	for (prop = sym->prop; prop; prop = prop->next) {
237		switch (prop->type) {
238		case P_DEFAULT:
239			if ((sym->type == S_STRING || sym->type == S_INT || sym->type == S_HEX) &&
240			    prop->expr->type != E_SYMBOL)
241				prop_warn(prop,
242				    "default for config symbol '%s'"
243				    " must be a single symbol", sym->name);
244			if (prop->expr->type != E_SYMBOL)
245				break;
246			sym2 = prop_get_symbol(prop);
247			if (sym->type == S_HEX || sym->type == S_INT) {
248				if (!menu_validate_number(sym, sym2))
249					prop_warn(prop,
250					    "'%s': number is invalid",
251					    sym->name);
252			}
253			break;
254		case P_SELECT:
255			sym2 = prop_get_symbol(prop);
256			if (sym->type != S_BOOLEAN && sym->type != S_TRISTATE)
257				prop_warn(prop,
258				    "config symbol '%s' uses select, but is "
259				    "not boolean or tristate", sym->name);
260			else if (sym2->type != S_UNKNOWN &&
261				 sym2->type != S_BOOLEAN &&
262				 sym2->type != S_TRISTATE)
263				prop_warn(prop,
264				    "'%s' has wrong type. 'select' only "
265				    "accept arguments of boolean and "
266				    "tristate type", sym2->name);
267			break;
268		case P_RANGE:
269			if (sym->type != S_INT && sym->type != S_HEX)
270				prop_warn(prop, "range is only allowed "
271						"for int or hex symbols");
272			if (!menu_validate_number(sym, prop->expr->left.sym) ||
273			    !menu_validate_number(sym, prop->expr->right.sym))
274				prop_warn(prop, "range is invalid");
275			break;
276		default:
277			;
278		}
279	}
280}
281
282void menu_finalize(struct menu *parent)
283{
284	struct menu *menu, *last_menu;
285	struct symbol *sym;
286	struct property *prop;
287	struct expr *parentdep, *basedep, *dep, *dep2, **ep;
288
289	sym = parent->sym;
290	if (parent->list) {
291		if (sym && sym_is_choice(sym)) {
292			if (sym->type == S_UNKNOWN) {
293				/* find the first choice value to find out choice type */
294				current_entry = parent;
295				for (menu = parent->list; menu; menu = menu->next) {
296					if (menu->sym && menu->sym->type != S_UNKNOWN) {
297						menu_set_type(menu->sym->type);
298						break;
299					}
300				}
301			}
302			/* set the type of the remaining choice values */
303			for (menu = parent->list; menu; menu = menu->next) {
304				current_entry = menu;
305				if (menu->sym && menu->sym->type == S_UNKNOWN)
306					menu_set_type(sym->type);
307			}
308			parentdep = expr_alloc_symbol(sym);
309		} else if (parent->prompt)
310			parentdep = parent->prompt->visible.expr;
311		else
312			parentdep = parent->dep;
313
314		for (menu = parent->list; menu; menu = menu->next) {
315			basedep = expr_transform(menu->dep);
316			basedep = expr_alloc_and(expr_copy(parentdep), basedep);
317			basedep = expr_eliminate_dups(basedep);
318			menu->dep = basedep;
319			if (menu->sym)
320				prop = menu->sym->prop;
321			else
322				prop = menu->prompt;
323			for (; prop; prop = prop->next) {
324				if (prop->menu != menu)
325					continue;
326				dep = expr_transform(prop->visible.expr);
327				dep = expr_alloc_and(expr_copy(basedep), dep);
328				dep = expr_eliminate_dups(dep);
329				if (menu->sym && menu->sym->type != S_TRISTATE)
330					dep = expr_trans_bool(dep);
331				prop->visible.expr = dep;
332				if (prop->type == P_SELECT) {
333					struct symbol *es = prop_get_symbol(prop);
334					es->rev_dep.expr = expr_alloc_or(es->rev_dep.expr,
335							expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
336				}
337			}
338		}
339		for (menu = parent->list; menu; menu = menu->next)
340			menu_finalize(menu);
341	} else if (sym) {
342		basedep = parent->prompt ? parent->prompt->visible.expr : NULL;
343		basedep = expr_trans_compare(basedep, E_UNEQUAL, &symbol_no);
344		basedep = expr_eliminate_dups(expr_transform(basedep));
345		last_menu = NULL;
346		for (menu = parent->next; menu; menu = menu->next) {
347			dep = menu->prompt ? menu->prompt->visible.expr : menu->dep;
348			if (!expr_contains_symbol(dep, sym))
349				break;
350			if (expr_depends_symbol(dep, sym))
351				goto next;
352			dep = expr_trans_compare(dep, E_UNEQUAL, &symbol_no);
353			dep = expr_eliminate_dups(expr_transform(dep));
354			dep2 = expr_copy(basedep);
355			expr_eliminate_eq(&dep, &dep2);
356			expr_free(dep);
357			if (!expr_is_yes(dep2)) {
358				expr_free(dep2);
359				break;
360			}
361			expr_free(dep2);
362		next:
363			menu_finalize(menu);
364			menu->parent = parent;
365			last_menu = menu;
366		}
367		if (last_menu) {
368			parent->list = parent->next;
369			parent->next = last_menu->next;
370			last_menu->next = NULL;
371		}
372
373		sym->dir_dep.expr = expr_alloc_or(sym->dir_dep.expr, parent->dep);
374	}
375	for (menu = parent->list; menu; menu = menu->next) {
376		if (sym && sym_is_choice(sym) &&
377		    menu->sym && !sym_is_choice_value(menu->sym)) {
378			current_entry = menu;
379			menu->sym->flags |= SYMBOL_CHOICEVAL;
380			if (!menu->prompt)
381				menu_warn(menu, "choice value must have a prompt");
382			for (prop = menu->sym->prop; prop; prop = prop->next) {
383				if (prop->type == P_DEFAULT)
384					prop_warn(prop, "defaults for choice "
385						  "values not supported");
386				if (prop->menu == menu)
387					continue;
388				if (prop->type == P_PROMPT &&
389				    prop->menu->parent->sym != sym)
390					prop_warn(prop, "choice value used outside its choice group");
391			}
392			/* Non-tristate choice values of tristate choices must
393			 * depend on the choice being set to Y. The choice
394			 * values' dependencies were propagated to their
395			 * properties above, so the change here must be re-
396			 * propagated.
397			 */
398			if (sym->type == S_TRISTATE && menu->sym->type != S_TRISTATE) {
399				basedep = expr_alloc_comp(E_EQUAL, sym, &symbol_yes);
400				menu->dep = expr_alloc_and(basedep, menu->dep);
401				for (prop = menu->sym->prop; prop; prop = prop->next) {
402					if (prop->menu != menu)
403						continue;
404					prop->visible.expr = expr_alloc_and(expr_copy(basedep),
405									    prop->visible.expr);
406				}
407			}
408			menu_add_symbol(P_CHOICE, sym, NULL);
409			prop = sym_get_choice_prop(sym);
410			for (ep = &prop->expr; *ep; ep = &(*ep)->left.expr)
411				;
412			*ep = expr_alloc_one(E_LIST, NULL);
413			(*ep)->right.sym = menu->sym;
414		}
415		if (menu->list && (!menu->prompt || !menu->prompt->text)) {
416			for (last_menu = menu->list; ; last_menu = last_menu->next) {
417				last_menu->parent = parent;
418				if (!last_menu->next)
419					break;
420			}
421			last_menu->next = menu->next;
422			menu->next = menu->list;
423			menu->list = NULL;
424		}
425	}
426
427	if (sym && !(sym->flags & SYMBOL_WARNED)) {
428		if (sym->type == S_UNKNOWN)
429			menu_warn(parent, "config symbol defined without type");
430
431		if (sym_is_choice(sym) && !parent->prompt)
432			menu_warn(parent, "choice must have a prompt");
433
434		/* Check properties connected to this symbol */
435		sym_check_prop(sym);
436		sym->flags |= SYMBOL_WARNED;
437	}
438
439	if (sym && !sym_is_optional(sym) && parent->prompt) {
440		sym->rev_dep.expr = expr_alloc_or(sym->rev_dep.expr,
441				expr_alloc_and(parent->prompt->visible.expr,
442					expr_alloc_symbol(&symbol_mod)));
443	}
444}
445
446bool menu_has_prompt(struct menu *menu)
447{
448	if (!menu->prompt)
449		return false;
450	return true;
451}
452
453/*
454 * Determine if a menu is empty.
455 * A menu is considered empty if it contains no or only
456 * invisible entries.
457 */
458bool menu_is_empty(struct menu *menu)
459{
460	struct menu *child;
461
462	for (child = menu->list; child; child = child->next) {
463		if (menu_is_visible(child))
464			return(false);
465	}
466	return(true);
467}
468
469bool menu_is_visible(struct menu *menu)
470{
471	struct menu *child;
472	struct symbol *sym;
473	tristate visible;
474
475	if (!menu->prompt)
476		return false;
477
478	if (menu->visibility) {
479		if (expr_calc_value(menu->visibility) == no)
480			return no;
481	}
482
483	sym = menu->sym;
484	if (sym) {
485		sym_calc_value(sym);
486		visible = menu->prompt->visible.tri;
487	} else
488		visible = menu->prompt->visible.tri = expr_calc_value(menu->prompt->visible.expr);
489
490	if (visible != no)
491		return true;
492
493	if (!sym || sym_get_tristate_value(menu->sym) == no)
494		return false;
495
496	for (child = menu->list; child; child = child->next) {
497		if (menu_is_visible(child)) {
498			if (sym)
499				sym->flags |= SYMBOL_DEF_USER;
500			return true;
501		}
502	}
503
504	return false;
505}
506
507const char *menu_get_prompt(struct menu *menu)
508{
509	if (menu->prompt)
510		return menu->prompt->text;
511	else if (menu->sym)
512		return menu->sym->name;
513	return NULL;
514}
515
516struct menu *menu_get_root_menu(struct menu *menu)
517{
518	return &rootmenu;
519}
520
521struct menu *menu_get_parent_menu(struct menu *menu)
522{
523	enum prop_type type;
524
525	for (; menu != &rootmenu; menu = menu->parent) {
526		type = menu->prompt ? menu->prompt->type : 0;
527		if (type == P_MENU)
528			break;
529	}
530	return menu;
531}
532
533bool menu_has_help(struct menu *menu)
534{
535	return menu->help != NULL;
536}
537
538const char *menu_get_help(struct menu *menu)
539{
540	if (menu->help)
541		return menu->help;
542	else
543		return "";
544}
545
546static void get_prompt_str(struct gstr *r, struct property *prop,
547			   struct list_head *head)
548{
549	int i, j;
550	struct menu *submenu[8], *menu, *location = NULL;
551	struct jump_key *jump = NULL;
552
553	str_printf(r, _("Prompt: %s\n"), _(prop->text));
554	menu = prop->menu->parent;
555	for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent) {
556		bool accessible = menu_is_visible(menu);
557
558		submenu[i++] = menu;
559		if (location == NULL && accessible)
560			location = menu;
561	}
562	if (head && location) {
563		jump = xmalloc(sizeof(struct jump_key));
564
565		if (menu_is_visible(prop->menu)) {
566			/*
567			 * There is not enough room to put the hint at the
568			 * beginning of the "Prompt" line. Put the hint on the
569			 * last "Location" line even when it would belong on
570			 * the former.
571			 */
572			jump->target = prop->menu;
573		} else
574			jump->target = location;
575
576		if (list_empty(head))
577			jump->index = 0;
578		else
579			jump->index = list_entry(head->prev, struct jump_key,
580						 entries)->index + 1;
581
582		list_add_tail(&jump->entries, head);
583	}
584
585	if (i > 0) {
586		str_printf(r, _("  Location:\n"));
587		for (j = 4; --i >= 0; j += 2) {
588			menu = submenu[i];
589			if (jump && menu == location)
590				jump->offset = strlen(r->s);
591			str_printf(r, "%*c-> %s", j, ' ',
592				   _(menu_get_prompt(menu)));
593			if (menu->sym) {
594				str_printf(r, " (%s [=%s])", menu->sym->name ?
595					menu->sym->name : _("<choice>"),
596					sym_get_string_value(menu->sym));
597			}
598			str_append(r, "\n");
599		}
600	}
601}
602
603/*
604 * get property of type P_SYMBOL
605 */
606static struct property *get_symbol_prop(struct symbol *sym)
607{
608	struct property *prop = NULL;
609
610	for_all_properties(sym, prop, P_SYMBOL)
611		break;
612	return prop;
613}
614
615/*
616 * head is optional and may be NULL
617 */
618void get_symbol_str(struct gstr *r, struct symbol *sym,
619		    struct list_head *head)
620{
621	bool hit;
622	struct property *prop;
623
624	if (sym && sym->name) {
625		str_printf(r, "Symbol: %s [=%s]\n", sym->name,
626			   sym_get_string_value(sym));
627		str_printf(r, "Type  : %s\n", sym_type_name(sym->type));
628		if (sym->type == S_INT || sym->type == S_HEX) {
629			prop = sym_get_range_prop(sym);
630			if (prop) {
631				str_printf(r, "Range : ");
632				expr_gstr_print(prop->expr, r);
633				str_append(r, "\n");
634			}
635		}
636	}
637	for_all_prompts(sym, prop)
638		get_prompt_str(r, prop, head);
639
640	prop = get_symbol_prop(sym);
641	if (prop) {
642		str_printf(r, _("  Defined at %s:%d\n"), prop->menu->file->name,
643			prop->menu->lineno);
644		if (!expr_is_yes(prop->visible.expr)) {
645			str_append(r, _("  Depends on: "));
646			expr_gstr_print(prop->visible.expr, r);
647			str_append(r, "\n");
648		}
649	}
650
651	hit = false;
652	for_all_properties(sym, prop, P_SELECT) {
653		if (!hit) {
654			str_append(r, "  Selects: ");
655			hit = true;
656		} else
657			str_printf(r, " && ");
658		expr_gstr_print(prop->expr, r);
659	}
660	if (hit)
661		str_append(r, "\n");
662	if (sym->rev_dep.expr) {
663		str_append(r, _("  Selected by: "));
664		expr_gstr_print(sym->rev_dep.expr, r);
665		str_append(r, "\n");
666	}
667	str_append(r, "\n\n");
668}
669
670struct gstr get_relations_str(struct symbol **sym_arr, struct list_head *head)
671{
672	struct symbol *sym;
673	struct gstr res = str_new();
674	int i;
675
676	for (i = 0; sym_arr && (sym = sym_arr[i]); i++)
677		get_symbol_str(&res, sym, head);
678	if (!i)
679		str_append(&res, _("No matches found.\n"));
680	return res;
681}
682
683
684void menu_get_ext_help(struct menu *menu, struct gstr *help)
685{
686	struct symbol *sym = menu->sym;
687	const char *help_text = nohelp_text;
688
689	if (menu_has_help(menu)) {
690		if (sym->name)
691			str_printf(help, "%s%s:\n\n", CONFIG_, sym->name);
692		help_text = menu_get_help(menu);
693	}
694	str_printf(help, "%s\n", _(help_text));
695	if (sym)
696		get_symbol_str(help, sym, NULL);
697}
698