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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
*/
%{

#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>

#include <xalloc.h>
#include "lkc.h"
#include "internal.h"
#include "preprocess.h"

#define printd(mask, fmt...) if (cdebug & (mask)) printf(fmt)

#define PRINTD  0x0001
#define DEBUG_PARSE 0x0002

int cdebug = PRINTD;

static void yyerror(const char *err);
static void zconf_error(const char *err, ...);
static bool zconf_endtoken(const char *tokenname,
      const char *expected_tokenname);

struct menu *current_menu, *current_entry, *current_choice;

%}

%union
{
char *string;
struct symbol *symbol;
struct expr *expr;
struct menu *menu;
enum symbol_type type;
enum variable_flavor flavor;
}

%token <string> T_HELPTEXT
%token <string> T_WORD
%token <string> T_WORD_QUOTE
%token T_BOOL
%token T_CHOICE
%token T_CLOSE_PAREN
%token T_COLON_EQUAL
%token T_COMMENT
%token T_CONFIG
%token T_DEFAULT
%token T_DEF_BOOL
%token T_DEF_TRISTATE
%token T_DEPENDS
%token T_ENDCHOICE
%token T_ENDIF
%token T_ENDMENU
%token T_HELP
%token T_HEX
%token T_IF
%token T_IMPLY
%token T_INT
%token T_MAINMENU
%token T_MENU
%token T_MENUCONFIG
%token T_MODULES
%token T_ON
%token T_OPEN_PAREN
%token T_PLUS_EQUAL
%token T_PROMPT
%token T_RANGE
%token T_SELECT
%token T_SOURCE
%token T_STRING
%token T_TRISTATE
%token T_VISIBLE
%token T_EOL
%token <string> T_ASSIGN_VAL

%left T_OR
%left T_AND
%left T_EQUAL T_UNEQUAL
%left T_LESS T_LESS_EQUAL T_GREATER T_GREATER_EQUAL
%nonassoc T_NOT

%type <symbol> nonconst_symbol
%type <symbol> symbol
%type <type> type default
%type <expr> expr
%type <expr> if_expr
%type <string> end
%type <menu> if_entry menu_entry choice_entry
%type <string> assign_val
%type <flavor> assign_op

%destructor {
fprintf(stderr, "%s:%d: missing end statement for this entry\n",
  $$->filename, $$->lineno);
if (current_menu == $$)
  menu_end_menu();
} if_entry menu_entry choice_entry

%%
input: mainmenu_stmt stmt_list | stmt_list;

/* mainmenu entry */

mainmenu_stmt: T_MAINMENU T_WORD_QUOTE T_EOL
{
menu_add_prompt(P_MENU, $2, NULL);
};

stmt_list:
   /* empty */
| stmt_list assignment_stmt
| stmt_list choice_stmt
| stmt_list comment_stmt
| stmt_list config_stmt
| stmt_list if_stmt
| stmt_list menu_stmt
| stmt_list menuconfig_stmt
| stmt_list source_stmt
| stmt_list T_WORD error T_EOL { zconf_error("unknown statement \"%s\"", $2); }
| stmt_list error T_EOL  { zconf_error("invalid statement"); }
;

stmt_list_in_choice:
   /* empty */
| stmt_list_in_choice comment_stmt
| stmt_list_in_choice config_stmt
| stmt_list_in_choice if_stmt_in_choice
| stmt_list_in_choice error T_EOL { zconf_error("invalid statement"); }
;

/* config/menuconfig entry */

config_entry_start: T_CONFIG nonconst_symbol T_EOL
{
menu_add_entry($2, M_NORMAL);
printd(DEBUG_PARSE, "%s:%d:config %s\n", cur_filename, cur_lineno, $2->name);
};

config_stmt: config_entry_start config_option_list
{
if (current_choice) {
  if (!current_entry->prompt) {
   fprintf(stderr, "%s:%d: error: choice member must have a prompt\n",
    current_entry->filename, current_entry->lineno);
   yynerrs++;
  }

  if (current_entry->sym->type != S_BOOLEAN) {
   fprintf(stderr, "%s:%d: error: choice member must be bool\n",
    current_entry->filename, current_entry->lineno);
   yynerrs++;
  }

  /*
   * If the same symbol appears twice in a choice block, the list
   * node would be added twice, leading to a broken linked list.
   * list_empty() ensures that this symbol has not yet added.
   */
  if (list_empty(¤t_entry->sym->choice_link))
   list_add_tail(¤t_entry->sym->choice_link,
          ¤t_choice->choice_members);
}

printd(DEBUG_PARSE, "%s:%d:endconfig\n", cur_filename, cur_lineno);
};

menuconfig_entry_start: T_MENUCONFIG nonconst_symbol T_EOL
{
menu_add_entry($2, M_MENU);
printd(DEBUG_PARSE, "%s:%d:menuconfig %s\n", cur_filename, cur_lineno, $2->name);
};

menuconfig_stmt: menuconfig_entry_start config_option_list
{
if (current_entry->prompt)
  current_entry->prompt->type = P_MENU;
else
  zconf_error("menuconfig statement without prompt");
printd(DEBUG_PARSE, "%s:%d:endconfig\n", cur_filename, cur_lineno);
};

config_option_list:
   /* empty */
| config_option_list config_option
| config_option_list depends
| config_option_list help
;

config_option: type prompt_stmt_opt T_EOL
{
menu_set_type($1);
printd(DEBUG_PARSE, "%s:%d:type(%u)\n", cur_filename, cur_lineno, $1);
};

config_option: T_PROMPT T_WORD_QUOTE if_expr T_EOL
{
menu_add_prompt(P_PROMPT, $2, $3);
printd(DEBUG_PARSE, "%s:%d:prompt\n", cur_filename, cur_lineno);
};

config_option: default expr if_expr T_EOL
{
menu_add_expr(P_DEFAULT, $2, $3);
if ($1 != S_UNKNOWN)
  menu_set_type($1);
printd(DEBUG_PARSE, "%s:%d:default(%u)\n", cur_filename, cur_lineno,
  $1);
};

config_option: T_SELECT nonconst_symbol if_expr T_EOL
{
menu_add_symbol(P_SELECT, $2, $3);
printd(DEBUG_PARSE, "%s:%d:select\n", cur_filename, cur_lineno);
};

config_option: T_IMPLY nonconst_symbol if_expr T_EOL
{
menu_add_symbol(P_IMPLY, $2, $3);
printd(DEBUG_PARSE, "%s:%d:imply\n", cur_filename, cur_lineno);
};

config_option: T_RANGE symbol symbol if_expr T_EOL
{
menu_add_expr(P_RANGE, expr_alloc_comp(E_RANGE,$2, $3), $4);
printd(DEBUG_PARSE, "%s:%d:range\n", cur_filename, cur_lineno);
};

config_option: T_MODULES T_EOL
{
if (modules_sym)
  zconf_error("symbol '%s' redefines option 'modules' already defined by symbol '%s'",
       current_entry->sym->name, modules_sym->name);
modules_sym = current_entry->sym;
};

/* choice entry */

choice: T_CHOICE T_EOL
{
struct symbol *sym = sym_lookup(NULL, 0);

menu_add_entry(sym, M_CHOICE);
menu_set_type(S_BOOLEAN);
INIT_LIST_HEAD(¤t_entry->choice_members);

printd(DEBUG_PARSE, "%s:%d:choice\n", cur_filename, cur_lineno);
};

choice_entry: choice choice_option_list
{
if (!current_entry->prompt) {
  fprintf(stderr, "%s:%d: error: choice must have a prompt\n",
   current_entry->filename, current_entry->lineno);
  yynerrs++;
}

$$ = menu_add_menu();

current_choice = current_entry;
};

choice_end: end
{
current_choice = NULL;

if (zconf_endtoken($1, "choice")) {
  menu_end_menu();
  printd(DEBUG_PARSE, "%s:%d:endchoice\n", cur_filename, cur_lineno);
}
};

choice_stmt: choice_entry stmt_list_in_choice choice_end
;

choice_option_list:
   /* empty */
| choice_option_list choice_option
| choice_option_list depends
| choice_option_list help
;

choice_option: T_PROMPT T_WORD_QUOTE if_expr T_EOL
{
menu_add_prompt(P_PROMPT, $2, $3);
printd(DEBUG_PARSE, "%s:%d:prompt\n", cur_filename, cur_lineno);
};

choice_option: T_DEFAULT nonconst_symbol if_expr T_EOL
{
menu_add_symbol(P_DEFAULT, $2, $3);
printd(DEBUG_PARSE, "%s:%d:default\n", cur_filename, cur_lineno);
};

type:
   T_BOOL  { $$ = S_BOOLEAN; }
| T_TRISTATE  { $$ = S_TRISTATE; }
| T_INT   { $$ = S_INT; }
| T_HEX   { $$ = S_HEX; }
| T_STRING  { $$ = S_STRING; }

default:
   T_DEFAULT  { $$ = S_UNKNOWN; }
| T_DEF_BOOL  { $$ = S_BOOLEAN; }
| T_DEF_TRISTATE { $$ = S_TRISTATE; }

/* if entry */

if_entry: T_IF expr T_EOL
{
printd(DEBUG_PARSE, "%s:%d:if\n", cur_filename, cur_lineno);
menu_add_entry(NULL, M_IF);
menu_add_dep($2);
$$ = menu_add_menu();
};

if_end: end
{
if (zconf_endtoken($1, "if")) {
  menu_end_menu();
  printd(DEBUG_PARSE, "%s:%d:endif\n", cur_filename, cur_lineno);
}
};

if_stmt: if_entry stmt_list if_end
;

if_stmt_in_choice: if_entry stmt_list_in_choice if_end
;

/* menu entry */

menu: T_MENU T_WORD_QUOTE T_EOL
{
menu_add_entry(NULL, M_MENU);
menu_add_prompt(P_MENU, $2, NULL);
printd(DEBUG_PARSE, "%s:%d:menu\n", cur_filename, cur_lineno);
};

menu_entry: menu menu_option_list
{
$$ = menu_add_menu();
};

menu_end: end
{
if (zconf_endtoken($1, "menu")) {
  menu_end_menu();
  printd(DEBUG_PARSE, "%s:%d:endmenu\n", cur_filename, cur_lineno);
}
};

menu_stmt: menu_entry stmt_list menu_end
;

menu_option_list:
   /* empty */
| menu_option_list visible
| menu_option_list depends
;

source_stmt: T_SOURCE T_WORD_QUOTE T_EOL
{
printd(DEBUG_PARSE, "%s:%d:source %s\n", cur_filename, cur_lineno, $2);
zconf_nextfile($2);
free($2);
};

/* comment entry */

comment: T_COMMENT T_WORD_QUOTE T_EOL
{
menu_add_entry(NULL, M_COMMENT);
menu_add_prompt(P_COMMENT, $2, NULL);
printd(DEBUG_PARSE, "%s:%d:comment\n", cur_filename, cur_lineno);
};

comment_stmt: comment comment_option_list
;

comment_option_list:
   /* empty */
| comment_option_list depends
;

/* help option */

help_start: T_HELP T_EOL
{
printd(DEBUG_PARSE, "%s:%d:help\n", cur_filename, cur_lineno);
zconf_starthelp();
};

help: help_start T_HELPTEXT
{
if (current_entry->help) {
  free(current_entry->help);
  zconf_error("'%s' defined with more than one help text",
       current_entry->sym->name ?: "<choice>");
}

/* Is the help text empty or all whitespace? */
if ($2[strspn($2, " \f\n\r\t\v")] == '\0')
  zconf_error("'%s' defined with blank help text",
       current_entry->sym->name ?: "<choice>");

current_entry->help = $2;
};

/* depends option */

depends: T_DEPENDS T_ON expr T_EOL
{
menu_add_dep($3);
printd(DEBUG_PARSE, "%s:%d:depends on\n", cur_filename, cur_lineno);
};

/* visibility option */
visible: T_VISIBLE if_expr T_EOL
{
menu_add_visibility($2);
};

/* prompt statement */

prompt_stmt_opt:
   /* empty */
| T_WORD_QUOTE if_expr
{
menu_add_prompt(P_PROMPT, $1, $2);
};

end:   T_ENDMENU T_EOL { $$ = "menu"; }
| T_ENDCHOICE T_EOL { $$ = "choice"; }
| T_ENDIF T_EOL  { $$ = "if"; }
;

if_expr:  /* empty */   { $$ = NULL; }
| T_IF expr   { $$ = $2; }
;

expr:   symbol    { $$ = expr_alloc_symbol($1); }
| symbol T_LESS symbol   { $$ = expr_alloc_comp(E_LTH, $1, $3); }
| symbol T_LESS_EQUAL symbol  { $$ = expr_alloc_comp(E_LEQ, $1, $3); }
| symbol T_GREATER symbol  { $$ = expr_alloc_comp(E_GTH, $1, $3); }
| symbol T_GREATER_EQUAL symbol  { $$ = expr_alloc_comp(E_GEQ, $1, $3); }
| symbol T_EQUAL symbol   { $$ = expr_alloc_comp(E_EQUAL, $1, $3); }
| symbol T_UNEQUAL symbol  { $$ = expr_alloc_comp(E_UNEQUAL, $1, $3); }
| T_OPEN_PAREN expr T_CLOSE_PAREN { $$ = $2; }
| T_NOT expr    { $$ = expr_alloc_one(E_NOT, $2); }
| expr T_OR expr   { $$ = expr_alloc_two(E_OR, $1, $3); }
| expr T_AND expr   { $$ = expr_alloc_two(E_AND, $1, $3); }
;

/* For symbol definitions, selects, etc., where quotes are not accepted */
nonconst_symbol: T_WORD { $$ = sym_lookup($1, 0); free($1); };

symbol:   nonconst_symbol
| T_WORD_QUOTE { $$ = sym_lookup($1, SYMBOL_CONST); free($1); }
;

/* assignment statement */

assignment_stmt:  T_WORD assign_op assign_val T_EOL { variable_add($1, $3, $2); free($1); free($3); }

assign_op:
   T_EQUAL { $$ = VAR_RECURSIVE; }
| T_COLON_EQUAL { $$ = VAR_SIMPLE; }
| T_PLUS_EQUAL { $$ = VAR_APPEND; }
;

assign_val:
/* empty */  { $$ = xstrdup(""); };
| T_ASSIGN_VAL
;

%%

/**
* choice_check_sanity - check sanity of a choice member
*
* @menu: menu of the choice member
*
* Return: -1 if an error is found, 0 otherwise.
*/
static int choice_check_sanity(const struct menu *menu)
{
struct property *prop;
int ret = 0;

for (prop = menu->sym->prop; prop; prop = prop->next) {
  if (prop->type == P_DEFAULT) {
   fprintf(stderr, "%s:%d: error: %s",
    prop->filename, prop->lineno,
    "defaults for choice values not supported\n");
   ret = -1;
  }

  if (prop->menu != menu && prop->type == P_PROMPT &&
      prop->menu->parent != menu->parent) {
   fprintf(stderr, "%s:%d: error: %s",
    prop->filename, prop->lineno,
    "choice value has a prompt outside its choice group\n");
   ret = -1;
  }
}

return ret;
}

void conf_parse(const char *name)
{
struct menu *menu;

autoconf_cmd = str_new();

str_printf(&autoconf_cmd, "\ndeps_config := \\\n");

zconf_initscan(name);

_menu_init();

if (getenv("ZCONF_DEBUG"))
  yydebug = 1;
yyparse();

str_printf(&autoconf_cmd,
     "\n"
     "$(autoconfig): $(deps_config)\n"
     "$(deps_config): ;\n");

env_write_dep(&autoconf_cmd);

/* Variables are expanded in the parse phase. We can free them here. */
variable_all_del();

if (yynerrs)
  exit(1);
if (!modules_sym)
  modules_sym = &symbol_no;

if (!menu_has_prompt(&rootmenu)) {
  current_entry = &rootmenu;
  menu_add_prompt(P_MENU, "Main menu", NULL);
}

menu_finalize();

menu_for_each_entry(menu) {
  struct menu *child;

  if (menu->sym && sym_check_deps(menu->sym))
   yynerrs++;

  if (menu->sym && sym_is_choice(menu->sym)) {
   menu_for_each_sub_entry(child, menu)
    if (child->sym && choice_check_sanity(child))
     yynerrs++;
  }
}

if (yynerrs)
  exit(1);
conf_set_changed(true);
}

static bool zconf_endtoken(const char *tokenname,
      const char *expected_tokenname)
{
if (strcmp(tokenname, expected_tokenname)) {
  zconf_error("unexpected '%s' within %s block",
       tokenname, expected_tokenname);
  yynerrs++;
  return false;
}
if (strcmp(current_menu->filename, cur_filename)) {
  zconf_error("'%s' in different file than '%s'",
       tokenname, expected_tokenname);
  fprintf(stderr, "%s:%d: location of the '%s'\n",
   current_menu->filename, current_menu->lineno,
   expected_tokenname);
  yynerrs++;
  return false;
}
return true;
}

static void zconf_error(const char *err, ...)
{
va_list ap;

yynerrs++;
fprintf(stderr, "%s:%d: ", cur_filename, cur_lineno);
va_start(ap, err);
vfprintf(stderr, err, ap);
va_end(ap);
fprintf(stderr, "\n");
}

static void yyerror(const char *err)
{
fprintf(stderr, "%s:%d: %s\n", cur_filename, cur_lineno, err);
}

static void print_quoted_string(FILE *out, const char *str)
{
const char *p;
int len;

putc('"', out);
while ((p = strchr(str, '"'))) {
  len = p - str;
  if (len)
   fprintf(out, "%.*s", len, str);
  fputs("\\\"", out);
  str = p + 1;
}
fputs(str, out);
putc('"', out);
}

static void print_symbol(FILE *out, const struct menu *menu)
{
struct symbol *sym = menu->sym;
struct property *prop;

if (sym_is_choice(sym))
  fprintf(out, "\nchoice\n");
else
  fprintf(out, "\nconfig %s\n", sym->name);
switch (sym->type) {
case S_BOOLEAN:
  fputs("  bool\n", out);
  break;
case S_TRISTATE:
  fputs("  tristate\n", out);
  break;
case S_STRING:
  fputs("  string\n", out);
  break;
case S_INT:
  fputs("  integer\n", out);
  break;
case S_HEX:
  fputs("  hex\n", out);
  break;
default:
  fputs("  ???\n", out);
  break;
}
for (prop = sym->prop; prop; prop = prop->next) {
  if (prop->menu != menu)
   continue;
  switch (prop->type) {
  case P_PROMPT:
   fputs("  prompt ", out);
   print_quoted_string(out, prop->text);
   if (!expr_is_yes(prop->visible.expr)) {
    fputs(" if ", out);
    expr_fprint(prop->visible.expr, out);
   }
   fputc('\n', out);
   break;
  case P_DEFAULT:
   fputs( "  default ", out);
   expr_fprint(prop->expr, out);
   if (!expr_is_yes(prop->visible.expr)) {
    fputs(" if ", out);
    expr_fprint(prop->visible.expr, out);
   }
   fputc('\n', out);
   break;
  case P_SELECT:
   fputs( "  select ", out);
   expr_fprint(prop->expr, out);
   fputc('\n', out);
   break;
  case P_IMPLY:
   fputs( "  imply ", out);
   expr_fprint(prop->expr, out);
   fputc('\n', out);
   break;
  case P_RANGE:
   fputs( "  range ", out);
   expr_fprint(prop->expr, out);
   fputc('\n', out);
   break;
  case P_MENU:
   fputs( "  menu ", out);
   print_quoted_string(out, prop->text);
   fputc('\n', out);
   break;
  default:
   fprintf(out, "  unknown prop %d!\n", prop->type);
   break;
  }
}
if (menu->help) {
  int len = strlen(menu->help);
  while (menu->help[--len] == '\n')
   menu->help[len] = 0;
  fprintf(out, "  help\n%s\n", menu->help);
}
}

void zconfdump(FILE *out)
{
struct property *prop;
struct symbol *sym;
struct menu *menu;

menu = rootmenu.list;
while (menu) {
  if ((sym = menu->sym))
   print_symbol(out, menu);
  else if ((prop = menu->prompt)) {
   switch (prop->type) {
   case P_COMMENT:
    fputs("\ncomment ", out);
    print_quoted_string(out, prop->text);
    fputs("\n", out);
    break;
   case P_MENU:
    fputs("\nmenu ", out);
    print_quoted_string(out, prop->text);
    fputs("\n", out);
    break;
   default:
    ;
   }
   if (!expr_is_yes(prop->visible.expr)) {
    fputs("  depends ", out);
    expr_fprint(prop->visible.expr, out);
    fputc('\n', out);
   }
  }

  if (menu->list)
   menu = menu->list;
  else if (menu->next)
   menu = menu->next;
  else while ((menu = menu->parent)) {
   if (menu->prompt && menu->prompt->type == P_MENU)
    fputs("\nendmenu\n", out);
   if (menu->next) {
    menu = menu->next;
    break;
   }
  }
}
}

Quelle parser.y Sprache: unbekannt

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