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%option backup nostdinit noyywrap never-interactive full ecs
%option 8bit backup nodefault perf-report perf-report
%x COMMAND HELP STRING PARAM
%{
/*
 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
 * Released under the terms of the GNU GPL v2.0.
 */

#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define LKC_DIRECT_LINK
#include "lkc.h"

#define START_STRSIZE   16

char *text;
static char *text_ptr;
static int text_size, text_asize;

struct buffer {
        struct buffer *parent;
        YY_BUFFER_STATE state;
};

struct buffer *current_buf;

static int last_ts, first_ts;

static void zconf_endhelp(void);
static struct buffer *zconf_endfile(void);

void new_string(void)
{
        text = malloc(START_STRSIZE);
        text_asize = START_STRSIZE;
        text_ptr = text;
        text_size = 0;
        *text_ptr = 0;
}

void append_string(const char *str, int size)
{
        int new_size = text_size + size + 1;
        if (new_size > text_asize) {
                text = realloc(text, new_size);
                text_asize = new_size;
                text_ptr = text + text_size;
        }
        memcpy(text_ptr, str, size);
        text_ptr += size;
        text_size += size;
        *text_ptr = 0;
}

void alloc_string(const char *str, int size)
{
        text = malloc(size + 1);
        memcpy(text, str, size);
        text[size] = 0;
}
%}

ws      [ \n\t]
n       [A-Za-z0-9_]

%%
        int str = 0;
        int ts, i;

[ \t]*#.*\n     current_file->lineno++;
[ \t]*#.*

[ \t]*\n        current_file->lineno++; return T_EOL;

[ \t]+  {
        BEGIN(COMMAND);
}

.       {
        unput(yytext[0]);
        BEGIN(COMMAND);
}


<COMMAND>{
        "mainmenu"              BEGIN(PARAM); return T_MAINMENU;
        "menu"                  BEGIN(PARAM); return T_MENU;
        "endmenu"               BEGIN(PARAM); return T_ENDMENU;
        "source"                BEGIN(PARAM); return T_SOURCE;
        "choice"                BEGIN(PARAM); return T_CHOICE;
        "endchoice"             BEGIN(PARAM); return T_ENDCHOICE;
        "comment"               BEGIN(PARAM); return T_COMMENT;
        "config"                BEGIN(PARAM); return T_CONFIG;
        "menuconfig"            BEGIN(PARAM); return T_MENUCONFIG;
        "help"                  BEGIN(PARAM); return T_HELP;
        "if"                    BEGIN(PARAM); return T_IF;
        "endif"                 BEGIN(PARAM); return T_ENDIF;
        "depends"               BEGIN(PARAM); return T_DEPENDS;
        "requires"              BEGIN(PARAM); return T_REQUIRES;
        "optional"              BEGIN(PARAM); return T_OPTIONAL;
        "default"               BEGIN(PARAM); return T_DEFAULT;
        "prompt"                BEGIN(PARAM); return T_PROMPT;
        "tristate"              BEGIN(PARAM); return T_TRISTATE;
        "def_tristate"          BEGIN(PARAM); return T_DEF_TRISTATE;
        "bool"                  BEGIN(PARAM); return T_BOOLEAN;
        "boolean"               BEGIN(PARAM); return T_BOOLEAN;
        "def_bool"              BEGIN(PARAM); return T_DEF_BOOLEAN;
        "def_boolean"           BEGIN(PARAM); return T_DEF_BOOLEAN;
        "int"                   BEGIN(PARAM); return T_INT;
        "hex"                   BEGIN(PARAM); return T_HEX;
        "string"                BEGIN(PARAM); return T_STRING;
        "select"                BEGIN(PARAM); return T_SELECT;
        "enable"                BEGIN(PARAM); return T_SELECT;
        "range"                 BEGIN(PARAM); return T_RANGE;
        {n}+    {
                alloc_string(yytext, yyleng);
                zconflval.string = text;
                return T_WORD;
        }
        .
        \n      current_file->lineno++; BEGIN(INITIAL);
}

<PARAM>{
        "&&"    return T_AND;
        "||"    return T_OR;
        "("     return T_OPEN_PAREN;
        ")"     return T_CLOSE_PAREN;
        "!"     return T_NOT;
        "="     return T_EQUAL;
        "!="    return T_UNEQUAL;
        "if"    return T_IF;
        "on"    return T_ON;
        \"|\'   {
                str = yytext[0];
                new_string();
                BEGIN(STRING);
        }
        \n      BEGIN(INITIAL); current_file->lineno++; return T_EOL;
        ---     /* ignore */
        ({n}|[-/.])+    {
                alloc_string(yytext, yyleng);
                zconflval.string = text;
                return T_WORD;
        }
        #.*     /* comment */
        \\\n    current_file->lineno++;
        .
        <<EOF>> {
                BEGIN(INITIAL);
        }
}

<STRING>{
        [^'"\\\n]+/\n   {
                append_string(yytext, yyleng);
                zconflval.string = text;
                return T_WORD_QUOTE;
        }
        [^'"\\\n]+      {
                append_string(yytext, yyleng);
        }
        \\.?/\n {
                append_string(yytext + 1, yyleng - 1);
                zconflval.string = text;
                return T_WORD_QUOTE;
        }
        \\.?    {
                append_string(yytext + 1, yyleng - 1);
        }
        \'|\"   {
                if (str == yytext[0]) {
                        BEGIN(PARAM);
                        zconflval.string = text;
                        return T_WORD_QUOTE;
                } else
                        append_string(yytext, 1);
        }
        \n      {
                printf("%s:%d:warning: multi-line strings not supported\n", zconf_curname(), zconf_lineno());
                current_file->lineno++;
                BEGIN(INITIAL);
                return T_EOL;
        }
        <<EOF>> {
                BEGIN(INITIAL);
        }
}

<HELP>{
        [ \t]+  {
                ts = 0;
                for (i = 0; i < yyleng; i++) {
                        if (yytext[i] == '\t')
                                ts = (ts & ~7) + 8;
                        else
                                ts++;
                }
                last_ts = ts;
                if (first_ts) {
                        if (ts < first_ts) {
                                zconf_endhelp();
                                return T_HELPTEXT;
                        }
                        ts -= first_ts;
                        while (ts > 8) {
                                append_string("        ", 8);
                                ts -= 8;
                        }
                        append_string("        ", ts);
                }
        }
        [ \t]*\n/[^ \t\n] {
                current_file->lineno++;
                zconf_endhelp();
                return T_HELPTEXT;
        }
        [ \t]*\n        {
                current_file->lineno++;
                append_string("\n", 1);
        }
        [^ \t\n].* {
                append_string(yytext, yyleng);
                if (!first_ts)
                        first_ts = last_ts;
        }
        <<EOF>> {
                zconf_endhelp();
                return T_HELPTEXT;
        }
}

<<EOF>> {
        if (current_buf) {
                zconf_endfile();
                return T_EOF;
        }
        fclose(yyin);
        yyterminate();
}

%%
void zconf_starthelp(void)
{
        new_string();
        last_ts = first_ts = 0;
        BEGIN(HELP);
}

static void zconf_endhelp(void)
{
        zconflval.string = text;
        BEGIN(INITIAL);
}


/*
 * Try to open specified file with following names:
 * ./name
 * $(srctree)/name
 * The latter is used when srctree is separate from objtree
 * when compiling the kernel.
 * Return NULL if file is not found.
 */
FILE *zconf_fopen(const char *name)
{
        char *env, fullname[PATH_MAX+1];
        FILE *f;

        f = fopen(name, "r");
        if (!f && name[0] != '/') {
                env = getenv(SRCTREE);
                if (env) {
                        sprintf(fullname, "%s/%s", env, name);
                        f = fopen(fullname, "r");
                }
        }
        return f;
}

void zconf_initscan(const char *name)
{
        yyin = zconf_fopen(name);
        if (!yyin) {
                printf("can't find file %s\n", name);
                exit(1);
        }

        current_buf = malloc(sizeof(*current_buf));
        memset(current_buf, 0, sizeof(*current_buf));

        current_file = file_lookup(name);
        current_file->lineno = 1;
        current_file->flags = FILE_BUSY;
}

void zconf_nextfile(const char *name)
{
        struct file *file = file_lookup(name);
        struct buffer *buf = malloc(sizeof(*buf));
        memset(buf, 0, sizeof(*buf));

        current_buf->state = YY_CURRENT_BUFFER;
        yyin = zconf_fopen(name);
        if (!yyin) {
                printf("%s:%d: can't open file \"%s\"\n", zconf_curname(), zconf_lineno(), name);
                exit(1);
        }
        yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
        buf->parent = current_buf;
        current_buf = buf;

        if (file->flags & FILE_BUSY) {
                printf("recursive scan (%s)?\n", name);
                exit(1);
        }
        if (file->flags & FILE_SCANNED) {
                printf("file %s already scanned?\n", name);
                exit(1);
        }
        file->flags |= FILE_BUSY;
        file->lineno = 1;
        file->parent = current_file;
        current_file = file;
}

static struct buffer *zconf_endfile(void)
{
        struct buffer *parent;

        current_file->flags |= FILE_SCANNED;
        current_file->flags &= ~FILE_BUSY;
        current_file = current_file->parent;

        parent = current_buf->parent;
        if (parent) {
                fclose(yyin);
                yy_delete_buffer(YY_CURRENT_BUFFER);
                yy_switch_to_buffer(parent->state);
        }
        free(current_buf);
        current_buf = parent;

        return parent;
}

int zconf_lineno(void)
{
        if (current_buf)
                return current_file->lineno - 1;
        else
                return 0;
}

char *zconf_curname(void)
{
        if (current_buf)
                return current_file->name;
        else
                return "<none>";
}