root/trunk/freewrt/tools/config/zconf.y

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

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

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

#define PRINTD          0x0001
#define DEBUG_PARSE     0x0002

int cdebug = PRINTD;

extern int zconflex(void);
static void zconfprint(const char *err, ...);
static void zconferror(const char *err);
static bool zconf_endtoken(int token, int starttoken, int endtoken);

struct symbol *symbol_hash[257];

#define YYERROR_VERBOSE
%}
%expect 40

%union
{
        int token;
        char *string;
        struct symbol *symbol;
        struct expr *expr;
        struct menu *menu;
}

%token T_MAINMENU
%token T_MENU
%token T_ENDMENU
%token T_SOURCE
%token T_CHOICE
%token T_ENDCHOICE
%token T_COMMENT
%token T_CONFIG
%token T_MENUCONFIG
%token T_HELP
%token <string> T_HELPTEXT
%token T_IF
%token T_ENDIF
%token T_DEPENDS
%token T_REQUIRES
%token T_OPTIONAL
%token T_PROMPT
%token T_DEFAULT
%token T_TRISTATE
%token T_DEF_TRISTATE
%token T_BOOLEAN
%token T_DEF_BOOLEAN
%token T_STRING
%token T_INT
%token T_HEX
%token <string> T_WORD
%token <string> T_WORD_QUOTE
%token T_UNEQUAL
%token T_EOF
%token T_EOL
%token T_CLOSE_PAREN
%token T_OPEN_PAREN
%token T_ON
%token T_SELECT
%token T_RANGE

%left T_OR
%left T_AND
%left T_EQUAL T_UNEQUAL
%nonassoc T_NOT

%type <string> prompt
%type <string> source
%type <symbol> symbol
%type <expr> expr
%type <expr> if_expr
%type <token> end

%{
#define LKC_DIRECT_LINK
#include "lkc.h"
%}
%%
input:    /* empty */
        | input block
;

block:    common_block
        | choice_stmt
        | menu_stmt
        | T_MAINMENU prompt nl_or_eof
        | T_ENDMENU             { zconfprint("unexpected 'endmenu' statement"); }
        | T_ENDIF               { zconfprint("unexpected 'endif' statement"); }
        | T_ENDCHOICE           { zconfprint("unexpected 'endchoice' statement"); }
        | error nl_or_eof       { zconfprint("syntax error"); yyerrok; }
;

common_block:
          if_stmt
        | comment_stmt
        | config_stmt
        | menuconfig_stmt
        | source_stmt
        | nl_or_eof
;


/* config/menuconfig entry */

config_entry_start: T_CONFIG T_WORD T_EOL
{
        struct symbol *sym = sym_lookup($2, 0);
        sym->flags |= SYMBOL_OPTIONAL;
        menu_add_entry(sym);
        printd(DEBUG_PARSE, "%s:%d:config %s\n", zconf_curname(), zconf_lineno(), $2);
};

config_stmt: config_entry_start config_option_list
{
        menu_end_entry();
        printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
};

menuconfig_entry_start: T_MENUCONFIG T_WORD T_EOL
{
        struct symbol *sym = sym_lookup($2, 0);
        sym->flags |= SYMBOL_OPTIONAL;
        menu_add_entry(sym);
        printd(DEBUG_PARSE, "%s:%d:menuconfig %s\n", zconf_curname(), zconf_lineno(), $2);
};

menuconfig_stmt: menuconfig_entry_start config_option_list
{
        if (current_entry->prompt)
                current_entry->prompt->type = P_MENU;
        else
                zconfprint("warning: menuconfig statement without prompt");
        menu_end_entry();
        printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
};

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

config_option: T_TRISTATE prompt_stmt_opt T_EOL
{
        menu_set_type(S_TRISTATE);
        printd(DEBUG_PARSE, "%s:%d:tristate\n", zconf_curname(), zconf_lineno());
};

config_option: T_DEF_TRISTATE expr if_expr T_EOL
{
        menu_add_expr(P_DEFAULT, $2, $3);
        menu_set_type(S_TRISTATE);
        printd(DEBUG_PARSE, "%s:%d:def_boolean\n", zconf_curname(), zconf_lineno());
};

config_option: T_BOOLEAN prompt_stmt_opt T_EOL
{
        menu_set_type(S_BOOLEAN);
        printd(DEBUG_PARSE, "%s:%d:boolean\n", zconf_curname(), zconf_lineno());
};

config_option: T_DEF_BOOLEAN expr if_expr T_EOL
{
        menu_add_expr(P_DEFAULT, $2, $3);
        menu_set_type(S_BOOLEAN);
        printd(DEBUG_PARSE, "%s:%d:def_boolean\n", zconf_curname(), zconf_lineno());
};

config_option: T_INT prompt_stmt_opt T_EOL
{
        menu_set_type(S_INT);
        printd(DEBUG_PARSE, "%s:%d:int\n", zconf_curname(), zconf_lineno());
};

config_option: T_HEX prompt_stmt_opt T_EOL
{
        menu_set_type(S_HEX);
        printd(DEBUG_PARSE, "%s:%d:hex\n", zconf_curname(), zconf_lineno());
};

config_option: T_STRING prompt_stmt_opt T_EOL
{
        menu_set_type(S_STRING);
        printd(DEBUG_PARSE, "%s:%d:string\n", zconf_curname(), zconf_lineno());
};

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

config_option: T_DEFAULT expr if_expr T_EOL
{
        menu_add_expr(P_DEFAULT, $2, $3);
        printd(DEBUG_PARSE, "%s:%d:default\n", zconf_curname(), zconf_lineno());
};

config_option: T_SELECT T_WORD if_expr T_EOL
{
        menu_add_symbol(P_SELECT, sym_lookup($2, 0), $3);
        printd(DEBUG_PARSE, "%s:%d:select\n", zconf_curname(), zconf_lineno());
};

config_option: T_SELECT T_NOT T_WORD if_expr T_EOL
{
        menu_add_symbol(P_SELECTNOT, sym_lookup($3, 0), $4);
        printd(DEBUG_PARSE, "%s:%d:selectnot\n", zconf_curname(), zconf_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", zconf_curname(), zconf_lineno());
};

/* choice entry */

choice: T_CHOICE T_EOL
{
        struct symbol *sym = sym_lookup(NULL, 0);
        sym->flags |= SYMBOL_CHOICE;
        menu_add_entry(sym);
        menu_add_expr(P_CHOICE, NULL, NULL);
        printd(DEBUG_PARSE, "%s:%d:choice\n", zconf_curname(), zconf_lineno());
};

choice_entry: choice choice_option_list
{
        menu_end_entry();
        menu_add_menu();
};

choice_end: end
{
        if (zconf_endtoken($1, T_CHOICE, T_ENDCHOICE)) {
                menu_end_menu();
                printd(DEBUG_PARSE, "%s:%d:endchoice\n", zconf_curname(), zconf_lineno());
        }
};

choice_stmt:
          choice_entry choice_block choice_end
        | choice_entry choice_block
{
        printf("%s:%d: missing 'endchoice' for this 'choice' statement\n", current_menu->file->name, current_menu->lineno);
        zconfnerrs++;
};

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

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

choice_option: T_TRISTATE prompt_stmt_opt T_EOL
{
        menu_set_type(S_TRISTATE);
        printd(DEBUG_PARSE, "%s:%d:tristate\n", zconf_curname(), zconf_lineno());
};

choice_option: T_BOOLEAN prompt_stmt_opt T_EOL
{
        menu_set_type(S_BOOLEAN);
        printd(DEBUG_PARSE, "%s:%d:boolean\n", zconf_curname(), zconf_lineno());
};

choice_option: T_OPTIONAL T_EOL
{
        current_entry->sym->flags |= SYMBOL_OPTIONAL;
        printd(DEBUG_PARSE, "%s:%d:optional\n", zconf_curname(), zconf_lineno());
};

choice_option: T_DEFAULT T_WORD if_expr T_EOL
{
        menu_add_symbol(P_DEFAULT, sym_lookup($2, 0), $3);
        printd(DEBUG_PARSE, "%s:%d:default\n", zconf_curname(), zconf_lineno());
};

choice_block:
          /* empty */
        | choice_block common_block
;

/* if entry */

if: T_IF expr T_EOL
{
        printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
        menu_add_entry(NULL);
        menu_add_dep($2);
        menu_end_entry();
        menu_add_menu();
};

if_end: end
{
        if (zconf_endtoken($1, T_IF, T_ENDIF)) {
                menu_end_menu();
                printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
        }
};

if_stmt:
          if if_block if_end
        | if if_block
{
        printf("%s:%d: missing 'endif' for this 'if' statement\n", current_menu->file->name, current_menu->lineno);
        zconfnerrs++;
};

if_block:
          /* empty */
        | if_block common_block
        | if_block menu_stmt
        | if_block choice_stmt
;

/* menu entry */

menu: T_MENU prompt T_EOL
{
        menu_add_entry(NULL);
        menu_add_prop(P_MENU, $2, NULL, NULL);
        printd(DEBUG_PARSE, "%s:%d:menu\n", zconf_curname(), zconf_lineno());
};

menu_entry: menu depends_list
{
        menu_end_entry();
        menu_add_menu();
};

menu_end: end
{
        if (zconf_endtoken($1, T_MENU, T_ENDMENU)) {
                menu_end_menu();
                printd(DEBUG_PARSE, "%s:%d:endmenu\n", zconf_curname(), zconf_lineno());
        }
};

menu_stmt:
          menu_entry menu_block menu_end
        | menu_entry menu_block
{
        printf("%s:%d: missing 'endmenu' for this 'menu' statement\n", current_menu->file->name, current_menu->lineno);
        zconfnerrs++;
};

menu_block:
          /* empty */
        | menu_block common_block
        | menu_block menu_stmt
        | menu_block choice_stmt
        | menu_block error T_EOL                { zconfprint("invalid menu option"); yyerrok; }
;

source: T_SOURCE prompt T_EOL
{
        $$ = $2;
        printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), $2);
};

source_stmt: source
{
        zconf_nextfile($1);
};

/* comment entry */

comment: T_COMMENT prompt T_EOL
{
        menu_add_entry(NULL);
        menu_add_prop(P_COMMENT, $2, NULL, NULL);
        printd(DEBUG_PARSE, "%s:%d:comment\n", zconf_curname(), zconf_lineno());
};

comment_stmt: comment depends_list
{
        menu_end_entry();
};

/* help option */

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

help: help_start T_HELPTEXT
{
        current_entry->sym->help = $2;
};

/* depends option */

depends_list:     /* empty */
                | depends_list depends
                | depends_list T_EOL
;

depends: T_DEPENDS T_ON expr T_EOL
{
        menu_add_dep($3);
        printd(DEBUG_PARSE, "%s:%d:depends on\n", zconf_curname(), zconf_lineno());
}
        | T_DEPENDS expr T_EOL
{
        menu_add_dep($2);
        printd(DEBUG_PARSE, "%s:%d:depends\n", zconf_curname(), zconf_lineno());
}
        | T_REQUIRES expr T_EOL
{
        menu_add_dep($2);
        printd(DEBUG_PARSE, "%s:%d:requires\n", zconf_curname(), zconf_lineno());
};

/* prompt statement */

prompt_stmt_opt:
          /* empty */
        | prompt if_expr
{
        menu_add_prop(P_PROMPT, $1, NULL, $2);
};

prompt:   T_WORD
        | T_WORD_QUOTE
;

end:      T_ENDMENU nl_or_eof   { $$ = T_ENDMENU; }
        | T_ENDCHOICE nl_or_eof { $$ = T_ENDCHOICE; }
        | T_ENDIF nl_or_eof     { $$ = T_ENDIF; }
;

nl_or_eof:
        T_EOL | T_EOF;

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

expr:     symbol                                { $$ = expr_alloc_symbol($1); }
        | symbol T_EQUAL symbol                 { $$ = 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); }
;

symbol:   T_WORD        { $$ = sym_lookup($1, 0); free($1); }
        | T_WORD_QUOTE  { $$ = sym_lookup($1, 1); free($1); }
;

%%

void conf_parse(const char *name)
{
        struct symbol *sym;
        int i;

        zconf_initscan(name);

        sym_init();
        menu_init();
        modules_sym = sym_lookup("MODULES", 0);
        rootmenu.prompt = menu_add_prop(P_MENU, "FreeWRT Configuration", NULL, NULL);

        //zconfdebug = 1;
        zconfparse();
        if (zconfnerrs)
                exit(1);
        menu_finalize(&rootmenu);
        for_all_symbols(i, sym) {
                if (!(sym->flags & SYMBOL_CHECKED) && sym_check_deps(sym))
                        printf("\n");
                else
                        sym->flags |= SYMBOL_CHECK_DONE;
        }

        sym_change_count = 1;
}

const char *zconf_tokenname(int token)
{
        switch (token) {
        case T_MENU:            return "menu";
        case T_ENDMENU:         return "endmenu";
        case T_CHOICE:          return "choice";
        case T_ENDCHOICE:       return "endchoice";
        case T_IF:              return "if";
        case T_ENDIF:           return "endif";
        }
        return "<token>";
}

static bool zconf_endtoken(int token, int starttoken, int endtoken)
{
        if (token != endtoken) {
                zconfprint("unexpected '%s' within %s block", zconf_tokenname(token), zconf_tokenname(starttoken));
                zconfnerrs++;
                return false;
        }
        if (current_menu->file != current_file) {
                zconfprint("'%s' in different file than '%s'", zconf_tokenname(token), zconf_tokenname(starttoken));
                zconfprint("location of the '%s'", zconf_tokenname(starttoken));
                zconfnerrs++;
                return false;
        }
        return true;
}

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

        fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno() + 1);
        va_start(ap, err);
        vfprintf(stderr, err, ap);
        va_end(ap);
        fprintf(stderr, "\n");
}

static void zconferror(const char *err)
{
        fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno() + 1, err);
}

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);
}

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

        if (sym_is_choice(sym))
                fprintf(out, "choice\n");
        else
                fprintf(out, "config %s\n", sym->name);
        switch (sym->type) {
        case S_BOOLEAN:
                fputs("  boolean\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_CHOICE:
                        fputs("  #choice value\n", out);
                        break;
                default:
                        fprintf(out, "  unknown prop %d!\n", prop->type);
                        break;
                }
        }
        if (sym->help) {
                int len = strlen(sym->help);
                while (sym->help[--len] == '\n')
                        sym->help[len] = 0;
                fprintf(out, "  help\n%s\n", sym->help);
        }
        fputc('\n', out);
}

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);
                        }
                        fputs("\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;
                        }
                }
        }
}

#include "lex.zconf.c"
#include "confdata.c"
#include "expr.c"
#include "symbol.c"
#include "menu.c"