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menu.c

/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#include <stdlib.h>
#include <string.h>

#define LKC_DIRECT_LINK
#include "lkc.h"

static const char nohelp_text[] = N_(
      "There is no help available for this kernel option.\n");

struct menu rootmenu;
static struct menu **last_entry_ptr;

struct file *file_list;
struct file *current_file;

void menu_warn(struct menu *menu, const char *fmt, ...)
{
      va_list ap;
      va_start(ap, fmt);
      fprintf(stderr, "%s:%d:warning: ", menu->file->name, menu->lineno);
      vfprintf(stderr, fmt, ap);
      fprintf(stderr, "\n");
      va_end(ap);
}

static void prop_warn(struct property *prop, const char *fmt, ...)
{
      va_list ap;
      va_start(ap, fmt);
      fprintf(stderr, "%s:%d:warning: ", prop->file->name, prop->lineno);
      vfprintf(stderr, fmt, ap);
      fprintf(stderr, "\n");
      va_end(ap);
}

void menu_init(void)
{
      current_entry = current_menu = &rootmenu;
      last_entry_ptr = &rootmenu.list;
}

void menu_add_entry(struct symbol *sym)
{
      struct menu *menu;

      menu = malloc(sizeof(*menu));
      memset(menu, 0, sizeof(*menu));
      menu->sym = sym;
      menu->parent = current_menu;
      menu->file = current_file;
      menu->lineno = zconf_lineno();

      *last_entry_ptr = menu;
      last_entry_ptr = &menu->next;
      current_entry = menu;
}

void menu_end_entry(void)
{
}

struct menu *menu_add_menu(void)
{
      menu_end_entry();
      last_entry_ptr = &current_entry->list;
      return current_menu = current_entry;
}

void menu_end_menu(void)
{
      last_entry_ptr = &current_menu->next;
      current_menu = current_menu->parent;
}

static struct expr *menu_check_dep(struct expr *e)
{
      if (!e)
            return e;

      switch (e->type) {
      case E_NOT:
            e->left.expr = menu_check_dep(e->left.expr);
            break;
      case E_OR:
      case E_AND:
            e->left.expr = menu_check_dep(e->left.expr);
            e->right.expr = menu_check_dep(e->right.expr);
            break;
      case E_SYMBOL:
            /* change 'm' into 'm' && MODULES */
            if (e->left.sym == &symbol_mod)
                  return expr_alloc_and(e, expr_alloc_symbol(modules_sym));
            break;
      default:
            break;
      }
      return e;
}

void menu_add_dep(struct expr *dep)
{
      current_entry->dep = expr_alloc_and(current_entry->dep, menu_check_dep(dep));
}

void menu_set_type(int type)
{
      struct symbol *sym = current_entry->sym;

      if (sym->type == type)
            return;
      if (sym->type == S_UNKNOWN) {
            sym->type = type;
            return;
      }
      menu_warn(current_entry, "type of '%s' redefined from '%s' to '%s'",
          sym->name ? sym->name : "<choice>",
          sym_type_name(sym->type), sym_type_name(type));
}

struct property *menu_add_prop(enum prop_type type, char *prompt, struct expr *expr, struct expr *dep)
{
      struct property *prop = prop_alloc(type, current_entry->sym);

      prop->menu = current_entry;
      prop->expr = expr;
      prop->visible.expr = menu_check_dep(dep);

      if (prompt) {
            if (isspace(*prompt)) {
                  prop_warn(prop, "leading whitespace ignored");
                  while (isspace(*prompt))
                        prompt++;
            }
            if (current_entry->prompt)
                  prop_warn(prop, "prompt redefined");
            current_entry->prompt = prop;
      }
      prop->text = prompt;

      return prop;
}

struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr *dep)
{
      return menu_add_prop(type, prompt, NULL, dep);
}

void menu_add_visibility(struct expr *expr)
{
        current_entry->visibility = expr_alloc_and(current_entry->visibility, expr);
}

void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep)
{
      menu_add_prop(type, NULL, expr, dep);
}

void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep)
{
      menu_add_prop(type, NULL, expr_alloc_symbol(sym), dep);
}

void menu_add_option(int token, char *arg)
{
      struct property *prop;

      switch (token) {
      case T_OPT_MODULES:
            prop = prop_alloc(P_DEFAULT, modules_sym);
            prop->expr = expr_alloc_symbol(current_entry->sym);
            break;
      case T_OPT_DEFCONFIG_LIST:
            if (!sym_defconfig_list)
                  sym_defconfig_list = current_entry->sym;
            else if (sym_defconfig_list != current_entry->sym)
                  zconf_error("trying to redefine defconfig symbol");
            break;
      case T_OPT_ENV:
            prop_add_env(arg);
            break;
      }
}

static int menu_range_valid_sym(struct symbol *sym, struct symbol *sym2)
{
      return sym2->type == S_INT || sym2->type == S_HEX ||
             (sym2->type == S_UNKNOWN && sym_string_valid(sym, sym2->name));
}

static void sym_check_prop(struct symbol *sym)
{
      struct property *prop;
      struct symbol *sym2;
      for (prop = sym->prop; prop; prop = prop->next) {
            switch (prop->type) {
            case P_DEFAULT:
                  if ((sym->type == S_STRING || sym->type == S_INT || sym->type == S_HEX) &&
                      prop->expr->type != E_SYMBOL)
                        prop_warn(prop,
                            "default for config symbol '%'"
                            " must be a single symbol", sym->name);
                  break;
            case P_SELECT:
                  sym2 = prop_get_symbol(prop);
                  if (sym->type != S_BOOLEAN && sym->type != S_TRISTATE)
                        prop_warn(prop,
                            "config symbol '%s' uses select, but is "
                            "not boolean or tristate", sym->name);
                  else if (sym2->type != S_UNKNOWN &&
                           sym2->type != S_BOOLEAN &&
                           sym2->type != S_TRISTATE)
                        prop_warn(prop,
                            "'%s' has wrong type. 'select' only "
                            "accept arguments of boolean and "
                            "tristate type", sym2->name);
                  break;
            case P_RANGE:
                  if (sym->type != S_INT && sym->type != S_HEX)
                        prop_warn(prop, "range is only allowed "
                                        "for int or hex symbols");
                  if (!menu_range_valid_sym(sym, prop->expr->left.sym) ||
                      !menu_range_valid_sym(sym, prop->expr->right.sym))
                        prop_warn(prop, "range is invalid");
                  break;
            default:
                  ;
            }
      }
}

void menu_finalize(struct menu *parent)
{
      struct menu *menu, *last_menu;
      struct symbol *sym;
      struct property *prop;
      struct expr *parentdep, *basedep, *dep, *dep2, **ep;

      sym = parent->sym;
      if (parent->list) {
            if (sym && sym_is_choice(sym)) {
                  if (sym->type == S_UNKNOWN) {
                        /* find the first choice value to find out choice type */
                        current_entry = parent;
                        for (menu = parent->list; menu; menu = menu->next) {
                              if (menu->sym && menu->sym->type != S_UNKNOWN) {
                                    menu_set_type(menu->sym->type);
                                    break;
                              }
                        }
                  }
                  /* set the type of the remaining choice values */
                  for (menu = parent->list; menu; menu = menu->next) {
                        current_entry = menu;
                        if (menu->sym && menu->sym->type == S_UNKNOWN)
                              menu_set_type(sym->type);
                  }
                  parentdep = expr_alloc_symbol(sym);
            } else if (parent->prompt)
                  parentdep = parent->prompt->visible.expr;
            else
                  parentdep = parent->dep;

            for (menu = parent->list; menu; menu = menu->next) {
                  basedep = expr_transform(menu->dep);
                  basedep = expr_alloc_and(expr_copy(parentdep), basedep);
                  basedep = expr_eliminate_dups(basedep);
                  menu->dep = basedep;
                  if (menu->sym)
                        prop = menu->sym->prop;
                  else
                        prop = menu->prompt;
                  for (; prop; prop = prop->next) {
                        if (prop->menu != menu)
                              continue;
                        dep = expr_transform(prop->visible.expr);
                        dep = expr_alloc_and(expr_copy(basedep), dep);
                        dep = expr_eliminate_dups(dep);
                        if (menu->sym && menu->sym->type != S_TRISTATE)
                              dep = expr_trans_bool(dep);
                        prop->visible.expr = dep;
                        if (prop->type == P_SELECT) {
                              struct symbol *es = prop_get_symbol(prop);
                              es->rev_dep.expr = expr_alloc_or(es->rev_dep.expr,
                                          expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
                        }
                  }
            }
            for (menu = parent->list; menu; menu = menu->next)
                  menu_finalize(menu);
      } else if (sym) {
            basedep = parent->prompt ? parent->prompt->visible.expr : NULL;
            basedep = expr_trans_compare(basedep, E_UNEQUAL, &symbol_no);
            basedep = expr_eliminate_dups(expr_transform(basedep));
            last_menu = NULL;
            for (menu = parent->next; menu; menu = menu->next) {
                  dep = menu->prompt ? menu->prompt->visible.expr : menu->dep;
                  if (!expr_contains_symbol(dep, sym))
                        break;
                  if (expr_depends_symbol(dep, sym))
                        goto next;
                  dep = expr_trans_compare(dep, E_UNEQUAL, &symbol_no);
                  dep = expr_eliminate_dups(expr_transform(dep));
                  dep2 = expr_copy(basedep);
                  expr_eliminate_eq(&dep, &dep2);
                  expr_free(dep);
                  if (!expr_is_yes(dep2)) {
                        expr_free(dep2);
                        break;
                  }
                  expr_free(dep2);
            next:
                  menu_finalize(menu);
                  menu->parent = parent;
                  last_menu = menu;
            }
            if (last_menu) {
                  parent->list = parent->next;
                  parent->next = last_menu->next;
                  last_menu->next = NULL;
            }
      }
      for (menu = parent->list; menu; menu = menu->next) {
            if (sym && sym_is_choice(sym) &&
                menu->sym && !sym_is_choice_value(menu->sym)) {
                  current_entry = menu;
                  menu->sym->flags |= SYMBOL_CHOICEVAL;
                  if (!menu->prompt)
                        menu_warn(menu, "choice value must have a prompt");
                  for (prop = menu->sym->prop; prop; prop = prop->next) {
                        if (prop->type == P_DEFAULT)
                              prop_warn(prop, "defaults for choice "
                                      "values not supported");
                        if (prop->menu == menu)
                              continue;
                        if (prop->type == P_PROMPT &&
                            prop->menu->parent->sym != sym)
                              prop_warn(prop, "choice value used outside its choice group");
                  }
                  /* Non-tristate choice values of tristate choices must
                   * depend on the choice being set to Y. The choice
                   * values' dependencies were propagated to their
                   * properties above, so the change here must be re-
                   * propagated.
                   */
                  if (sym->type == S_TRISTATE && menu->sym->type != S_TRISTATE) {
                        basedep = expr_alloc_comp(E_EQUAL, sym, &symbol_yes);
                        menu->dep = expr_alloc_and(basedep, menu->dep);
                        for (prop = menu->sym->prop; prop; prop = prop->next) {
                              if (prop->menu != menu)
                                    continue;
                              prop->visible.expr = expr_alloc_and(expr_copy(basedep),
                                                          prop->visible.expr);
                        }
                  }
                  menu_add_symbol(P_CHOICE, sym, NULL);
                  prop = sym_get_choice_prop(sym);
                  for (ep = &prop->expr; *ep; ep = &(*ep)->left.expr)
                        ;
                  *ep = expr_alloc_one(E_LIST, NULL);
                  (*ep)->right.sym = menu->sym;
            }
            if (menu->list && (!menu->prompt || !menu->prompt->text)) {
                  for (last_menu = menu->list; ; last_menu = last_menu->next) {
                        last_menu->parent = parent;
                        if (!last_menu->next)
                              break;
                  }
                  last_menu->next = menu->next;
                  menu->next = menu->list;
                  menu->list = NULL;
            }
      }

      if (sym && !(sym->flags & SYMBOL_WARNED)) {
            if (sym->type == S_UNKNOWN)
                  menu_warn(parent, "config symbol defined without type");

            if (sym_is_choice(sym) && !parent->prompt)
                  menu_warn(parent, "choice must have a prompt");

            /* Check properties connected to this symbol */
            sym_check_prop(sym);
            sym->flags |= SYMBOL_WARNED;
      }

      if (sym && !sym_is_optional(sym) && parent->prompt) {
            sym->rev_dep.expr = expr_alloc_or(sym->rev_dep.expr,
                        expr_alloc_and(parent->prompt->visible.expr,
                              expr_alloc_symbol(&symbol_mod)));
      }
}

bool menu_is_visible(struct menu *menu)
{
      struct menu *child;
      struct symbol *sym;
      tristate visible;

      if (!menu->prompt)
            return false;

        if (menu->visibility) {
                if (expr_calc_value(menu->visibility) == no)
                        return no;
        }


      sym = menu->sym;
      if (sym) {
            sym_calc_value(sym);
            visible = menu->prompt->visible.tri;
      } else
            visible = menu->prompt->visible.tri = expr_calc_value(menu->prompt->visible.expr);

      if (visible != no)
            return true;
      if (!sym || sym_get_tristate_value(menu->sym) == no)
            return false;

      for (child = menu->list; child; child = child->next)
            if (menu_is_visible(child))
                  return true;
      return false;
}

const char *menu_get_prompt(struct menu *menu)
{
      if (menu->prompt)
            return menu->prompt->text;
      else if (menu->sym)
            return menu->sym->name;
      return NULL;
}

struct menu *menu_get_root_menu(struct menu *menu)
{
      return &rootmenu;
}

struct menu *menu_get_parent_menu(struct menu *menu)
{
      enum prop_type type;

      for (; menu != &rootmenu; menu = menu->parent) {
            type = menu->prompt ? menu->prompt->type : 0;
            if (type == P_MENU)
                  break;
      }
      return menu;
}

bool menu_has_help(struct menu *menu)
{
      return menu->help != NULL;
}

const char *menu_get_help(struct menu *menu)
{
      if (menu->help)
            return menu->help;
      else
            return "";
}

static void get_prompt_str(struct gstr *r, struct property *prop)
{
      int i, j;
      struct menu *submenu[8], *menu;

      str_printf(r, _("Prompt: %s\n"), _(prop->text));
      str_printf(r, _("  Defined at %s:%d\n"), prop->menu->file->name,
            prop->menu->lineno);
      if (!expr_is_yes(prop->visible.expr)) {
            str_append(r, _("  Depends on: "));
            expr_gstr_print(prop->visible.expr, r);
            str_append(r, "\n");
      }
      menu = prop->menu->parent;
      for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent)
            submenu[i++] = menu;
      if (i > 0) {
            str_printf(r, _("  Location:\n"));
            for (j = 4; --i >= 0; j += 2) {
                  menu = submenu[i];
                  str_printf(r, "%*c-> %s", j, ' ', _(menu_get_prompt(menu)));
                  if (menu->sym) {
                        str_printf(r, " (%s [=%s])", menu->sym->name ?
                              menu->sym->name : _("<choice>"),
                              sym_get_string_value(menu->sym));
                  }
                  str_append(r, "\n");
            }
      }
}

void get_symbol_str(struct gstr *r, struct symbol *sym)
{
      bool hit;
      struct property *prop;

      if (sym && sym->name)
            str_printf(r, "Symbol: %s [=%s]\n", sym->name,
                     sym_get_string_value(sym));
      for_all_prompts(sym, prop)
            get_prompt_str(r, prop);
      hit = false;
      for_all_properties(sym, prop, P_SELECT) {
            if (!hit) {
                  str_append(r, "  Selects: ");
                  hit = true;
            } else
                  str_printf(r, " && ");
            expr_gstr_print(prop->expr, r);
      }
      if (hit)
            str_append(r, "\n");
      if (sym->rev_dep.expr) {
            str_append(r, _("  Selected by: "));
            expr_gstr_print(sym->rev_dep.expr, r);
            str_append(r, "\n");
      }
      str_append(r, "\n\n");
}

void menu_get_ext_help(struct menu *menu, struct gstr *help)
{
      struct symbol *sym = menu->sym;

      if (menu_has_help(menu)) {
            if (sym->name) {
                  str_printf(help, "CONFIG_%s:\n\n", sym->name);
                  str_append(help, _(menu_get_help(menu)));
                  str_append(help, "\n");
            }
      } else {
            str_append(help, nohelp_text);
      }
      if (sym)
            get_symbol_str(help, sym);
}

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