/************************************************

  tkutil.c -

  $Author$
  created at: Fri Nov  3 00:47:54 JST 1995

************************************************/

#define TKUTIL_RELEASE_DATE "2010-03-26"

#include "ruby.h"

#ifdef RUBY_VM
static int rb_thread_critical; /* dummy */
#else
/* On Ruby 1.8.x, use rb_thread_critical (defined at rubysig.h) */
#include "rubysig.h"
#endif
#ifdef HAVE_RUBY_ST_H
#include "ruby/st.h"
#else
#include "st.h"
#endif

#undef RUBY_UNTYPED_DATA_WARNING
#define RUBY_UNTYPED_DATA_WARNING 1

#if !defined(RHASH_TBL)
#define RHASH_TBL(h) (RHASH(h)->tbl)
#endif
#if !defined(RSTRING_PTR)
#define RSTRING_PTR(s) (RSTRING(s)->ptr)
#define RSTRING_LEN(s) (RSTRING(s)->len)
#endif
#if !defined(RARRAY_PTR)
#define RARRAY_PTR(s) (RARRAY(s)->ptr)
#define RARRAY_LEN(s) (RARRAY(s)->len)
#endif
#if !defined(RARRAY_CONST_PTR)
#define RARRAY_CONST_PTR(s) (const VALUE *)RARRAY_PTR(s)
#endif
#if !defined(RARRAY_AREF)
#define RARRAY_AREF(a, i) RARRAY_CONST_PTR(a)[i]
#endif

#if defined(HAVE_STRNDUP) && !defined(_GNU_SOURCE)
extern char *strndup(const char* _ptr, size_t _len);
#endif

#ifndef HAVE_RB_SYM2STR
# define rb_sym2str(obj) rb_id2str(SYM2ID(obj))
#endif

#ifndef HAVE_RB_ID2STR
# define rb_id2str(id) rb_str_new2(rb_id2name(id))
#endif

static VALUE cMethod;

static VALUE cTclTkLib;

static VALUE cTkObject;
static VALUE cTkCallbackEntry;

static VALUE TK_None;

static VALUE cCB_SUBST;
static VALUE cSUBST_INFO;

static VALUE ENCODING_NAME_UTF8; /* for saving GC cost */

static ID ID_split_tklist;
static ID ID_toUTF8;
static ID ID_fromUTF8;
static ID ID_path;
static ID ID_at_path;
static ID ID_at_enc;
static ID ID_to_eval;
static ID ID_to_s;
static ID ID_source;
static ID ID_downcase;
static ID ID_install_cmd;
static ID ID_merge_tklist;
static ID ID_encoding;
static ID ID_encoding_system;
static ID ID_call;

static ID ID_SUBST_INFO;

static VALUE CALLBACK_TABLE;
static unsigned long CALLBACK_ID_NUM = 0;

/*************************************/

#ifndef HAVE_STRNDUP
static char * strndup _((const char *, size_t));
static char *
strndup(ptr, len)
    const char *ptr;
    size_t len;
{
    char *newptr = malloc(len + 1);
    if (newptr) {
	memcpy(newptr, ptr, len);
	newptr[len] = '\0';
    }
    return newptr;
}
#endif

#ifndef HAVE_RB_ARY_CAT
static VALUE rb_ary_cat _((VALUE, const VALUE *, long));
static VALUE
rb_ary_cat(ary, argv, len)
    VALUE ary;
    const VALUE *argv;
    long len;
{
    long i;
    for (i = 0; i < len; i++) {
	rb_ary_push(ary, argv[i]);
    }
    return ary;
}
#endif

/*************************************/

#if defined(HAVE_RB_OBJ_INSTANCE_EXEC) && !defined(RUBY_VM)
extern VALUE rb_obj_instance_exec _((int, VALUE*, VALUE));
#endif
static VALUE
tk_s_new(argc, argv, klass)
    int argc;
    VALUE *argv;
    VALUE klass;
{
    VALUE obj = rb_class_new_instance(argc, argv, klass);

    if (rb_block_given_p()) {
#ifndef HAVE_RB_OBJ_INSTANCE_EXEC
      rb_obj_instance_eval(0, 0, obj);
#else
      rb_obj_instance_exec(1, &obj, obj);
#endif
    }
    return obj;
}

/*************************************/

static VALUE
tkNone_to_s(self)
    VALUE self;
{
    return rb_str_new2("");
}

static VALUE
tkNone_inspect(self)
    VALUE self;
{
    return rb_str_new2("None");
}

/*************************************/

static VALUE
tk_obj_untrust(self, obj)
    VALUE self;
    VALUE obj;
{
  return obj;
}

static VALUE
tk_eval_cmd(argc, argv, self)
    int argc;
    VALUE argv[];
    VALUE self;
{
    VALUE cmd, rest;

    rb_scan_args(argc, argv, "1*", &cmd, &rest);
#ifdef RB_PASS_KEYWORDS
    return rb_eval_cmd_kw(cmd, rest, 0);
#else
    return rb_eval_cmd(cmd, rest, 0);
#endif
}

static VALUE
tk_do_callback(argc, argv, self)
    int   argc;
    VALUE *argv;
    VALUE self;
{
#if 0
    volatile VALUE id;
    volatile VALUE rest;

    rb_scan_args(argc, argv, "1*", &id, &rest);
    return rb_apply(rb_hash_aref(CALLBACK_TABLE, id), ID_call, rest);
#endif
    return rb_funcall2(rb_hash_aref(CALLBACK_TABLE, argv[0]),
                       ID_call, argc - 1, argv + 1);
}

static const char cmd_id_head[] = "ruby_cmd TkUtil callback ";
static const char cmd_id_prefix[] = "cmd";

static VALUE
tk_install_cmd_core(cmd)
    VALUE cmd;
{
    volatile VALUE id_num;

    id_num = ULONG2NUM(CALLBACK_ID_NUM++);
    id_num = rb_funcallv(id_num, ID_to_s, 0, 0);
    id_num = rb_str_append(rb_str_new2(cmd_id_prefix), id_num);
    rb_hash_aset(CALLBACK_TABLE, id_num, cmd);
    return rb_str_append(rb_str_new2(cmd_id_head), id_num);
}

static VALUE
tk_install_cmd(argc, argv, self)
    int   argc;
    VALUE *argv;
    VALUE self;
{
    volatile VALUE cmd;

#if 0
    if (rb_scan_args(argc, argv, "01", &cmd) == 0) {
        cmd = rb_block_proc();
    }
    return tk_install_cmd_core(cmd);
#endif
    if (argc == 0) {
        cmd = rb_block_proc();
    } else {
        cmd = argv[0];
    }
    return tk_install_cmd_core(cmd);
}

static VALUE
tk_uninstall_cmd(self, cmd_id)
    VALUE self;
    VALUE cmd_id;
{
    size_t head_len = strlen(cmd_id_head);
    size_t prefix_len = strlen(cmd_id_prefix);

    StringValue(cmd_id);
    if (strncmp(cmd_id_head, RSTRING_PTR(cmd_id), head_len) != 0) {
        return Qnil;
    }
    if (strncmp(cmd_id_prefix,
                RSTRING_PTR(cmd_id) + head_len, prefix_len) != 0) {
        return Qnil;
    }

    return rb_hash_delete(CALLBACK_TABLE,
                          rb_str_new2(RSTRING_PTR(cmd_id) + head_len));
}

static VALUE
tk_toUTF8(argc, argv, self)
    int   argc;
    VALUE *argv;
    VALUE self;
{
    return rb_funcall2(cTclTkLib, ID_toUTF8, argc, argv);
}

static VALUE
tk_fromUTF8(argc, argv, self)
    int   argc;
    VALUE *argv;
    VALUE self;
{
    return rb_funcall2(cTclTkLib, ID_fromUTF8, argc, argv);
}

static VALUE
fromDefaultEnc_toUTF8(str, self)
    VALUE str;
    VALUE self;
{
    VALUE argv[1];

    argv[0] = str;
    return tk_toUTF8(1, argv, self);
}

#if 0
static VALUE
fromUTF8_toDefaultEnc(str, self)
    VALUE str;
    VALUE self;
{
    VALUE argv[1];

    argv[0] = str;
    return tk_fromUTF8(1, argv, self);
}
#endif

static int
to_strkey(key, value, hash)
    VALUE key;
    VALUE value;
    VALUE hash;
{
    rb_hash_aset(hash, rb_funcallv(key, ID_to_s, 0, 0), value);
    return ST_CHECK;
}

static VALUE
tk_symbolkey2str(self, keys)
    VALUE self;
    VALUE keys;
{
    volatile VALUE new_keys = rb_hash_new();

    if (NIL_P(keys)) return new_keys;
    keys = rb_convert_type(keys, T_HASH, "Hash", "to_hash");
    rb_hash_foreach(keys, to_strkey, new_keys);
    return new_keys;
}

static VALUE get_eval_string_core _((VALUE, VALUE, VALUE));
static VALUE ary2list _((VALUE, VALUE, VALUE));
static VALUE ary2list2 _((VALUE, VALUE, VALUE));
static VALUE hash2list _((VALUE, VALUE));
static VALUE hash2list_enc _((VALUE, VALUE));
static VALUE hash2kv _((VALUE, VALUE, VALUE));
static VALUE hash2kv_enc _((VALUE, VALUE, VALUE));

static VALUE
ary2list(ary, enc_flag, self)
    VALUE ary;
    VALUE enc_flag;
    VALUE self;
{
    long idx, idx2, size, size2;
    int req_chk_flag;
    volatile VALUE val, val2, str_val;
    volatile VALUE dst;
    volatile VALUE sys_enc, dst_enc, str_enc;

    sys_enc = rb_funcallv(cTclTkLib, ID_encoding, 0, 0);
    if (NIL_P(sys_enc)) {
      sys_enc = rb_funcallv(cTclTkLib, ID_encoding_system, 0, 0);
      sys_enc = rb_funcallv(sys_enc, ID_to_s, 0, 0);
    }

    if (NIL_P(enc_flag)) {
        dst_enc = sys_enc;
        req_chk_flag = 1;
    } else if (enc_flag == Qtrue || enc_flag == Qfalse) {
        dst_enc = enc_flag;
        req_chk_flag = 0;
    } else {
        dst_enc = rb_funcallv(enc_flag, ID_to_s, 0, 0);
        req_chk_flag = 0;
    }

    /* size = RARRAY_LEN(ary); */
    size = 0;
    for(idx = 0; idx < RARRAY_LEN(ary); idx++) {
        if (RB_TYPE_P(RARRAY_AREF(ary, idx), T_HASH)) {
            size += 2 * RHASH_SIZE(RARRAY_AREF(ary, idx));
        } else {
            size++;
        }
    }

    dst = rb_ary_new2(size);
    for(idx = 0; idx < RARRAY_LEN(ary); idx++) {
        val = RARRAY_AREF(ary, idx);
        str_val = Qnil;
        switch(TYPE(val)) {
        case T_ARRAY:
            str_val = ary2list(val, enc_flag, self);
            rb_ary_push(dst, str_val);

            if (req_chk_flag) {
                str_enc = rb_ivar_get(str_val, ID_at_enc);
                if (!NIL_P(str_enc)) {
                    str_enc = rb_funcallv(str_enc, ID_to_s, 0, 0);
                } else {
                    str_enc = sys_enc;
                }
                if (!rb_str_cmp(str_enc, dst_enc)) {
                    dst_enc = Qtrue;
                    req_chk_flag = 0;
                }
            }

            break;

        case T_HASH:
	    /* rb_ary_push(dst, hash2list(val, self)); */
            if (RTEST(enc_flag)) {
                val = hash2kv_enc(val, Qnil, self);
            } else {
                val = hash2kv(val, Qnil, self);
            }
            size2 = RARRAY_LEN(val);
            for(idx2 = 0; idx2 < size2; idx2++) {
                val2 = RARRAY_AREF(val, idx2);
                switch(TYPE(val2)) {
                case T_ARRAY:
                    str_val = ary2list(val2, enc_flag, self);
                    rb_ary_push(dst, str_val);
                    break;

                case T_HASH:
                    if (RTEST(enc_flag)) {
                        str_val = hash2list_enc(val2, self);
                    } else {
                        str_val = hash2list(val2, self);
                    }
                    rb_ary_push(dst, str_val);
                    break;

                default:
                    if (val2 != TK_None) {
                        str_val = get_eval_string_core(val2, enc_flag, self);
                        rb_ary_push(dst, str_val);
                    }
                }

                if (req_chk_flag) {
                    str_enc = rb_ivar_get(str_val, ID_at_enc);
                    if (!NIL_P(str_enc)) {
                        str_enc = rb_funcallv(str_enc, ID_to_s, 0, 0);
                    } else {
                        str_enc = sys_enc;
                    }
                    if (!rb_str_cmp(str_enc, dst_enc)) {
                        dst_enc = Qtrue;
                        req_chk_flag = 0;
                    }
                }
            }
            break;

        default:
            if (val != TK_None) {
                str_val = get_eval_string_core(val, enc_flag, self);
                rb_ary_push(dst, str_val);

                if (req_chk_flag) {
                    str_enc = rb_ivar_get(str_val, ID_at_enc);
                    if (!NIL_P(str_enc)) {
                        str_enc = rb_funcallv(str_enc, ID_to_s, 0, 0);
                    } else {
                        str_enc = sys_enc;
                    }
                    if (!rb_str_cmp(str_enc, dst_enc)) {
                        dst_enc = Qtrue;
                        req_chk_flag = 0;
                    }
                }
            }
        }
    }

    if (RTEST(dst_enc) && !NIL_P(sys_enc)) {
        for(idx = 0; idx < RARRAY_LEN(dst); idx++) {
            str_val = RARRAY_AREF(dst, idx);
            if (rb_obj_respond_to(self, ID_toUTF8, Qtrue)) {
                str_val = rb_funcall(self, ID_toUTF8, 1, str_val);
            } else {
                str_val = rb_funcall(cTclTkLib, ID_toUTF8, 1, str_val);
            }
            RARRAY_ASET(dst, idx, str_val);
        }
        val = rb_apply(cTclTkLib, ID_merge_tklist, dst);
        if (RB_TYPE_P(dst_enc, T_STRING)) {
            val = rb_funcall(cTclTkLib, ID_fromUTF8, 2, val, dst_enc);
            rb_ivar_set(val, ID_at_enc, dst_enc);
        } else {
            rb_ivar_set(val, ID_at_enc, ENCODING_NAME_UTF8);
        }
        return val;
    } else {
        return rb_apply(cTclTkLib, ID_merge_tklist, dst);
    }
}

static VALUE
ary2list2(ary, enc_flag, self)
    VALUE ary;
    VALUE enc_flag;
    VALUE self;
{
    long idx, size;
    int req_chk_flag;
    volatile VALUE val, str_val;
    volatile VALUE dst;
    volatile VALUE sys_enc, dst_enc, str_enc;

    sys_enc = rb_funcallv(cTclTkLib, ID_encoding, 0, 0);
    if (NIL_P(sys_enc)) {
      sys_enc = rb_funcallv(cTclTkLib, ID_encoding_system, 0, 0);
      sys_enc = rb_funcallv(sys_enc, ID_to_s, 0, 0);
    }

    if (NIL_P(enc_flag)) {
        dst_enc = sys_enc;
        req_chk_flag = 1;
    } else if (enc_flag == Qtrue || enc_flag == Qfalse) {
        dst_enc = enc_flag;
        req_chk_flag = 0;
    } else {
        dst_enc = rb_funcallv(enc_flag, ID_to_s, 0, 0);
        req_chk_flag = 0;
    }

    size = RARRAY_LEN(ary);
    dst = rb_ary_new2(size);
    for(idx = 0; idx < RARRAY_LEN(ary); idx++) {
        val = RARRAY_AREF(ary, idx);
        str_val = Qnil;
        switch(TYPE(val)) {
        case T_ARRAY:
            str_val = ary2list(val, enc_flag, self);
            break;

        case T_HASH:
            if (RTEST(enc_flag)) {
                str_val = hash2list(val, self);
            } else {
                str_val = hash2list_enc(val, self);
            }
            break;

        default:
            if (val != TK_None) {
                str_val = get_eval_string_core(val, enc_flag, self);
            }
        }

        if (!NIL_P(str_val)) {
            rb_ary_push(dst, str_val);

            if (req_chk_flag) {
                str_enc = rb_ivar_get(str_val, ID_at_enc);
                if (!NIL_P(str_enc)) {
                    str_enc = rb_funcallv(str_enc, ID_to_s, 0, 0);
                } else {
                    str_enc = sys_enc;
                }
                if (!rb_str_cmp(str_enc, dst_enc)) {
                    dst_enc = Qtrue;
                    req_chk_flag = 0;
                }
            }
        }
    }

    if (RTEST(dst_enc) && !NIL_P(sys_enc)) {
        for(idx = 0; idx < RARRAY_LEN(dst); idx++) {
            str_val = RARRAY_AREF(dst, idx);
            if (rb_obj_respond_to(self, ID_toUTF8, Qtrue)) {
                str_val = rb_funcall(self, ID_toUTF8, 1, str_val);
            } else {
                str_val = rb_funcall(cTclTkLib, ID_toUTF8, 1, str_val);
            }
            RARRAY_ASET(dst, idx, str_val);
        }
        val = rb_apply(cTclTkLib, ID_merge_tklist, dst);
        if (RB_TYPE_P(dst_enc, T_STRING)) {
            val = rb_funcall(cTclTkLib, ID_fromUTF8, 2, val, dst_enc);
            rb_ivar_set(val, ID_at_enc, dst_enc);
        } else {
            rb_ivar_set(val, ID_at_enc, ENCODING_NAME_UTF8);
        }
        return val;
    } else {
        return rb_apply(cTclTkLib, ID_merge_tklist, dst);
    }
}

static VALUE
key2keyname(key)
    VALUE key;
{
    return rb_str_append(rb_str_new2("-"), rb_funcallv(key, ID_to_s, 0, 0));
}

static VALUE
assoc2kv(assoc, ary, self)
    VALUE assoc;
    VALUE ary;
    VALUE self;
{
    long i, len;
    volatile VALUE pair;
    volatile VALUE val;
    volatile VALUE dst = rb_ary_new2(2 * RARRAY_LEN(assoc));

    len = RARRAY_LEN(assoc);

    for(i = 0; i < len; i++) {
        pair = RARRAY_AREF(assoc, i);
        if (!RB_TYPE_P(pair, T_ARRAY)) {
            rb_ary_push(dst, key2keyname(pair));
            continue;
        }
        switch(RARRAY_LEN(assoc)) {
        case 2:
            rb_ary_push(dst, RARRAY_AREF(pair, 2));

        case 1:
            rb_ary_push(dst, key2keyname(RARRAY_AREF(pair, 0)));

        case 0:
            continue;

        default:
            rb_ary_push(dst, key2keyname(RARRAY_AREF(pair, 0)));

            val = rb_ary_new2(RARRAY_LEN(pair) - 1);
            rb_ary_cat(val, RARRAY_CONST_PTR(pair) + 1, RARRAY_LEN(pair) - 1);

            rb_ary_push(dst, val);
        }
    }

    if (NIL_P(ary)) {
        return dst;
    } else {
        return rb_ary_plus(ary, dst);
    }
}

static VALUE
assoc2kv_enc(assoc, ary, self)
    VALUE assoc;
    VALUE ary;
    VALUE self;
{
    long i, len;
    volatile VALUE pair;
    volatile VALUE val;
    volatile VALUE dst = rb_ary_new2(2 * RARRAY_LEN(assoc));

    len = RARRAY_LEN(assoc);

    for(i = 0; i < len; i++) {
        pair = RARRAY_AREF(assoc, i);
        if (!RB_TYPE_P(pair, T_ARRAY)) {
            rb_ary_push(dst, key2keyname(pair));
            continue;
        }
        switch(RARRAY_LEN(assoc)) {
        case 2:
            rb_ary_push(dst, get_eval_string_core(RARRAY_AREF(pair, 2), Qtrue, self));

        case 1:
            rb_ary_push(dst, key2keyname(RARRAY_AREF(pair, 0)));

        case 0:
            continue;

        default:
            rb_ary_push(dst, key2keyname(RARRAY_AREF(pair, 0)));

            val = rb_ary_new2(RARRAY_LEN(pair) - 1);
            rb_ary_cat(val, RARRAY_CONST_PTR(pair) + 1, RARRAY_LEN(pair) - 1);

            rb_ary_push(dst, get_eval_string_core(val, Qtrue, self));
        }
    }

    if (NIL_P(ary)) {
        return dst;
    } else {
        return rb_ary_plus(ary, dst);
    }
}

static int
push_kv(key, val, args)
    VALUE key;
    VALUE val;
    VALUE args;
{
    volatile VALUE ary;

    ary = RARRAY_AREF(args, 0);

#if 0
    rb_ary_push(ary, key2keyname(key));
    if (val != TK_None) rb_ary_push(ary, val);
#endif
    rb_ary_push(ary, key2keyname(key));

    if (val == TK_None) return ST_CHECK;

    rb_ary_push(ary, get_eval_string_core(val, Qnil, RARRAY_AREF(args, 1)));

    return ST_CHECK;
}

static VALUE
hash2kv(hash, ary, self)
    VALUE hash;
    VALUE ary;
    VALUE self;
{
    volatile VALUE dst = rb_ary_new2(2 * RHASH_SIZE(hash));
    volatile VALUE args = rb_ary_new3(2, dst, self);

    rb_hash_foreach(hash, push_kv, args);

    if (NIL_P(ary)) {
        return dst;
    } else {
        return rb_ary_concat(ary, dst);
    }
}

static int
push_kv_enc(key, val, args)
    VALUE key;
    VALUE val;
    VALUE args;
{
    volatile VALUE ary;

    ary = RARRAY_AREF(args, 0);

#if 0
    rb_ary_push(ary, key2keyname(key));
    if (val != TK_None) {
        rb_ary_push(ary, get_eval_string_core(val, Qtrue,
                                              RARRAY_AREF(args, 1)));
    }
#endif
    rb_ary_push(ary, key2keyname(key));

    if (val == TK_None) return ST_CHECK;

    rb_ary_push(ary, get_eval_string_core(val, Qtrue, RARRAY_AREF(args, 1)));

    return ST_CHECK;
}

static VALUE
hash2kv_enc(hash, ary, self)
    VALUE hash;
    VALUE ary;
    VALUE self;
{
    volatile VALUE dst = rb_ary_new2(2 * RHASH_SIZE(hash));
    volatile VALUE args = rb_ary_new3(2, dst, self);

    rb_hash_foreach(hash, push_kv_enc, args);

    if (NIL_P(ary)) {
        return dst;
    } else {
        return rb_ary_concat(ary, dst);
    }
}

static VALUE
hash2list(hash, self)
    VALUE hash;
    VALUE self;
{
    return ary2list2(hash2kv(hash, Qnil, self), Qfalse, self);
}


static VALUE
hash2list_enc(hash, self)
    VALUE hash;
    VALUE self;
{
    return ary2list2(hash2kv_enc(hash, Qnil, self), Qfalse, self);
}

static VALUE
tk_hash_kv(argc, argv, self)
    int   argc;
    VALUE *argv;
    VALUE self;
{
    volatile VALUE hash, enc_flag, ary;

    ary = Qnil;
    enc_flag = Qnil;
    switch(argc) {
    case 3:
        ary = argv[2];
	if (!NIL_P(ary)) Check_Type(ary, T_ARRAY);
    case 2:
        enc_flag = argv[1];
    case 1:
        hash = argv[0];
        break;
    case 0:
        rb_raise(rb_eArgError, "too few arguments");
    default: /* >= 3 */
        rb_raise(rb_eArgError, "too many arguments");
    }

    switch(TYPE(hash)) {
    case T_ARRAY:
        if (RTEST(enc_flag)) {
            return assoc2kv_enc(hash, ary, self);
        } else {
            return assoc2kv(hash, ary, self);
        }

    case T_HASH:
        if (RTEST(enc_flag)) {
            return hash2kv_enc(hash, ary, self);
        } else {
            return hash2kv(hash, ary, self);
        }

    case T_NIL:
        if (NIL_P(ary)) {
            return rb_ary_new();
        } else {
            return ary;
        }

    default:
        if (hash == TK_None) {
            if (NIL_P(ary)) {
                return rb_ary_new();
            } else {
                return ary;
            }
        }
        rb_raise(rb_eArgError, "Hash is expected for 1st argument");
    }

    UNREACHABLE;
}

static VALUE
get_eval_string_core(obj, enc_flag, self)
    VALUE obj;
    VALUE enc_flag;
    VALUE self;
{
    switch(TYPE(obj)) {
    case T_FLOAT:
    case T_FIXNUM:
    case T_BIGNUM:
        return rb_funcallv(obj, ID_to_s, 0, 0);

    case T_STRING:
        if (RTEST(enc_flag)) {
            if (rb_obj_respond_to(self, ID_toUTF8, Qtrue)) {
                return rb_funcall(self, ID_toUTF8, 1, obj);
            } else {
                return fromDefaultEnc_toUTF8(obj, self);
            }
        } else {
            return obj;
        }

    case T_SYMBOL:
        if (RTEST(enc_flag)) {
            if (rb_obj_respond_to(self, ID_toUTF8, Qtrue)) {
                return rb_funcall(self, ID_toUTF8, 1,
                                  rb_str_dup(rb_sym2str(obj)));
            } else {
                return fromDefaultEnc_toUTF8(rb_sym2str(obj), self);
            }
        } else {
            return rb_sym2str(obj);
        }

    case T_HASH:
        if (RTEST(enc_flag)) {
            return hash2list_enc(obj, self);
        } else {
            return hash2list(obj, self);
        }

    case T_ARRAY:
        return ary2list(obj, enc_flag, self);

    case T_FALSE:
        return rb_str_new2("0");

    case T_TRUE:
        return rb_str_new2("1");

    case T_NIL:
        return rb_str_new2("");

    case T_REGEXP:
        return rb_funcallv(obj, ID_source, 0, 0);

    default:
        if (rb_obj_is_kind_of(obj, cTkObject)) {
            /* return rb_str_new3(rb_funcallv(obj, ID_path, 0, 0)); */
            return get_eval_string_core(rb_funcallv(obj, ID_path, 0, 0),
                                        enc_flag, self);
        }

        if (rb_obj_is_kind_of(obj, rb_cProc)
            || rb_obj_is_kind_of(obj, cMethod)
            || rb_obj_is_kind_of(obj, cTkCallbackEntry)) {
            if (rb_obj_respond_to(self, ID_install_cmd, Qtrue)) {
                return rb_funcall(self, ID_install_cmd, 1, obj);
            } else {
                return tk_install_cmd_core(obj);
            }
        }

        if (obj == TK_None)  return Qnil;

        if (rb_obj_respond_to(obj, ID_to_eval, Qtrue)) {
            /* return rb_funcallv(obj, ID_to_eval, 0, 0); */
            return get_eval_string_core(rb_funcallv(obj, ID_to_eval, 0, 0),
                                        enc_flag, self);
        } else if (rb_obj_respond_to(obj, ID_path, Qtrue)) {
            /* return rb_funcallv(obj, ID_path, 0, 0); */
            return get_eval_string_core(rb_funcallv(obj, ID_path, 0, 0),
                                        enc_flag, self);
        } else if (rb_obj_respond_to(obj, ID_to_s, Qtrue)) {
            return rb_funcallv(obj, ID_to_s, 0, 0);
        }
    }

    rb_warning("fail to convert '%+"PRIsVALUE"' to string for Tk", obj);

    return obj;
}

static VALUE
tk_get_eval_string(argc, argv, self)
    int   argc;
    VALUE *argv;
    VALUE self;
{
    VALUE obj, enc_flag;

    if (rb_scan_args(argc, argv, "11", &obj, &enc_flag) == 1) {
        enc_flag = Qnil;
    }

    return get_eval_string_core(obj, enc_flag, self);
}

static VALUE
tk_get_eval_enc_str(self, obj)
    VALUE self;
    VALUE obj;
{
    if (obj == TK_None) {
        return obj;
    } else {
        return get_eval_string_core(obj, Qtrue, self);
    }
}

static VALUE
tk_conv_args(argc, argv, self)
    int   argc;
    VALUE *argv; /* [0]:base_array, [1]:enc_mode, [2]..[n]:args */
    VALUE self;
{
    int idx;
    long size;
    volatile VALUE dst;
    int thr_crit_bup;
    VALUE old_gc;

    if (argc < 2) {
      rb_raise(rb_eArgError, "too few arguments");
    }

    thr_crit_bup = rb_thread_critical;
    rb_thread_critical = Qtrue;
    old_gc = rb_gc_disable();

    for(size = 0, idx = 2; idx < argc; idx++) {
        if (RB_TYPE_P(argv[idx], T_HASH)) {
            size += 2 * RHASH_SIZE(argv[idx]);
        } else {
            size++;
        }
    }
    /* dst = rb_ary_new2(argc - 2); */
    dst = rb_ary_new2(size);
    for(idx = 2; idx < argc; idx++) {
        if (RB_TYPE_P(argv[idx], T_HASH)) {
            if (RTEST(argv[1])) {
                hash2kv_enc(argv[idx], dst, self);
            } else {
                hash2kv(argv[idx], dst, self);
            }
        } else if (argv[idx] != TK_None) {
            rb_ary_push(dst, get_eval_string_core(argv[idx], argv[1], self));
        }
    }

    if (old_gc == Qfalse) rb_gc_enable();
    rb_thread_critical = thr_crit_bup;

    return rb_ary_plus(argv[0], dst);
}


/*************************************/

static VALUE
tcl2rb_bool(self, value)
    VALUE self;
    VALUE value;
{
    if (RB_TYPE_P(value, T_FIXNUM)) {
        if (NUM2INT(value) == 0) {
            return Qfalse;
        } else {
            return Qtrue;
        }
    }

    if (value == Qtrue || value == Qfalse) {
        return value;
    }

    rb_check_type(value, T_STRING);

    value = rb_funcall(value, ID_downcase, 0);

    if (RSTRING_PTR(value) == (char*)NULL) return Qnil;

    if (RSTRING_PTR(value)[0] == '\0'
        || strcmp(RSTRING_PTR(value), "0") == 0
        || strcmp(RSTRING_PTR(value), "no") == 0
        || strcmp(RSTRING_PTR(value), "off") == 0
        || strcmp(RSTRING_PTR(value), "false") == 0) {
        return Qfalse;
    } else {
        return Qtrue;
    }
}

#if 0
static VALUE
tkstr_to_dec(value)
    VALUE value;
{
    return rb_cstr_to_inum(RSTRING_PTR(value), 10, 1);
}
#endif

static VALUE
tkstr_to_int(value)
    VALUE value;
{
    return rb_str_to_inum(value, 0, 1);
}

static VALUE
tkstr_to_float(value)
    VALUE value;
{
    return rb_float_new(rb_str_to_dbl(value, 1));
}

static VALUE
tkstr_invalid_numstr(value)
    VALUE value;
{
    rb_raise(rb_eArgError,
             "invalid value for Number: '%s'", RSTRING_PTR(value));
    return Qnil; /*dummy*/
}

static VALUE
tkstr_rescue_float(value)
    VALUE value;
{
    return rb_rescue2(tkstr_to_float, value,
                      tkstr_invalid_numstr, value,
                      rb_eArgError, 0);
}

static VALUE
tkstr_to_number(value)
    VALUE value;
{
    rb_check_type(value, T_STRING);

    if (RSTRING_PTR(value) == (char*)NULL) return INT2FIX(0);

    return rb_rescue2(tkstr_to_int, value,
                      tkstr_rescue_float, value,
                      rb_eArgError, 0);
}

static VALUE
tcl2rb_number(self, value)
    VALUE self;
    VALUE value;
{
    return tkstr_to_number(value);
}

static VALUE
tkstr_to_str(value)
    VALUE value;
{
    char * ptr;
    long len;

    ptr = RSTRING_PTR(value);
    len = RSTRING_LEN(value);

    if (len > 1 && *ptr == '{' && *(ptr + len - 1) == '}') {
        return rb_str_new(ptr + 1, len - 2);
    }
    return value;
}

static VALUE
tcl2rb_string(self, value)
    VALUE self;
    VALUE value;
{
    rb_check_type(value, T_STRING);

    if (RSTRING_PTR(value) == (char*)NULL) return rb_str_new2("");

    return tkstr_to_str(value);
}

static VALUE
tcl2rb_num_or_str(self, value)
    VALUE self;
    VALUE value;
{
    rb_check_type(value, T_STRING);

    if (RSTRING_PTR(value) == (char*)NULL) return rb_str_new2("");

    return rb_rescue2(tkstr_to_number, value,
                      tkstr_to_str, value,
                      rb_eArgError, 0);
}

static VALUE
tcl2rb_num_or_nil(self, value)
    VALUE self;
    VALUE value;
{
    rb_check_type(value, T_STRING);

    if (RSTRING_LEN(value) == 0) return Qnil;

    return tkstr_to_number(value);
}


/*************************************/

#define CBSUBST_TBL_MAX (256)
struct cbsubst_info {
    long  full_subst_length;
    long  keylen[CBSUBST_TBL_MAX];
    char  *key[CBSUBST_TBL_MAX];
    char  type[CBSUBST_TBL_MAX];
    ID    ivar[CBSUBST_TBL_MAX];
    VALUE proc;
    VALUE aliases;
};

static void
subst_mark(ptr)
    struct cbsubst_info *ptr;
{
    rb_gc_mark(ptr->proc);
    rb_gc_mark(ptr->aliases);
}

static void
subst_free(ptr)
    struct cbsubst_info *ptr;
{
    int i;

    if (ptr) {
      for(i = 0; i < CBSUBST_TBL_MAX; i++) {
	if (ptr->key[i] != NULL) {
	  free(ptr->key[i]); /* allocated by malloc */
	  ptr->key[i] = NULL;
	}
      }
      xfree(ptr); /* allocated by ALLOC */
    }
}

static size_t
subst_memsize(ptr)
    const struct cbsubst_info *ptr;
{
    return sizeof(*ptr);
}

static const rb_data_type_t cbsubst_info_type = {
    "TkUtil/CallbackSubst/Info",
    {
	subst_mark,
	subst_free,
	subst_memsize,
    },
    0, 0, RUBY_TYPED_FREE_IMMEDIATELY,
};

static VALUE
allocate_cbsubst_info(struct cbsubst_info **inf_ptr)
{
  struct cbsubst_info *inf;
  volatile VALUE proc, aliases;
  int idx;

  VALUE info = TypedData_Make_Struct(cSUBST_INFO, struct cbsubst_info,
				     &cbsubst_info_type, inf);

  inf->full_subst_length = 0;

  for(idx = 0; idx < CBSUBST_TBL_MAX; idx++) {
    inf->keylen[idx] = 0;
    inf->key[idx]    = NULL;
    inf->type[idx]   = '\0';
    inf->ivar[idx]   = (ID) 0;
  }

  proc = rb_hash_new();
  inf->proc = proc;

  aliases = rb_hash_new();
  inf->aliases = aliases;

  if (inf_ptr != (struct cbsubst_info **)NULL) *inf_ptr = inf;

  return info;
}

static void
cbsubst_init(void)
{
  rb_const_set(cCB_SUBST, ID_SUBST_INFO,
	       allocate_cbsubst_info((struct cbsubst_info **)NULL));
}

static struct cbsubst_info *
cbsubst_get_ptr(klass)
    VALUE klass;
{
    return rb_check_typeddata(rb_const_get(klass, ID_SUBST_INFO), &cbsubst_info_type);
}

static VALUE
cbsubst_initialize(argc, argv, self)
    int   argc;
    VALUE *argv;
    VALUE self;
{
    struct cbsubst_info *inf;
    int idx, iv_idx;

    inf = cbsubst_get_ptr(rb_obj_class(self));

    if (argc > 0) {
	idx = 0;
	for (iv_idx = 0; iv_idx < CBSUBST_TBL_MAX; iv_idx++) {
	    if (inf->ivar[iv_idx] == (ID)0) continue;
	    rb_ivar_set(self, inf->ivar[iv_idx], argv[idx++]);
	    if (idx >= argc) break;
	}
    }

    return self;
}

static VALUE
cbsubst_ret_val(self, val)
    VALUE self;
    VALUE val;
{
    /* This method may be overwritten on some sub-classes.                  */
    /* This method is used for converting from ruby's callback-return-value */
    /* to tcl's value (e.g. validation procedure of entry widget).          */
    return val;
}

static int
each_attr_def(key, value, klass)
    VALUE key, value, klass;
{
    ID key_id, value_id;

    if (key == Qundef) return ST_CONTINUE;

    switch(TYPE(key)) {
    case T_STRING:
        key_id = rb_intern_str(key);
        break;
    case T_SYMBOL:
        key_id = SYM2ID(key);
        break;
    default:
        rb_raise(rb_eArgError,
                 "includes invalid key(s). expected a String or a Symbol");
    }

    switch(TYPE(value)) {
    case T_STRING:
        value_id = rb_intern_str(value);
        break;
    case T_SYMBOL:
        value_id = SYM2ID(value);
        break;
    default:
        rb_raise(rb_eArgError,
                 "includes invalid value(s). expected a String or a Symbol");
    }

    rb_alias(klass, key_id, value_id);

    return ST_CONTINUE;
}

static VALUE
cbsubst_def_attr_aliases(self, tbl)
    VALUE self;
    VALUE tbl;
{
    struct cbsubst_info *inf;

    if (!RB_TYPE_P(tbl, T_HASH)) {
        rb_raise(rb_eArgError, "expected a Hash");
    }

    inf = cbsubst_get_ptr(self);

    rb_hash_foreach(tbl, each_attr_def, self);

    return rb_funcall(inf->aliases, rb_intern("update"), 1, tbl);
}

static VALUE
cbsubst_append_inf_key(str, inf, idx)
    VALUE str;
    const struct cbsubst_info *inf;
    int idx;
{
    const long len = inf->keylen[idx];
    const long olen = RSTRING_LEN(str);
    char *buf, *ptr;

    rb_str_modify_expand(str, (len ? len : 1) + 2);
    buf = RSTRING_PTR(str);
    ptr = buf + olen;

    *(ptr++) = '%';

    if (len != 0) {
	/* longname */
	strncpy(ptr, inf->key[idx], len);
	ptr += len;
    }
    else {
	/* single char */
	*(ptr++) = (unsigned char)idx;
    }

    *(ptr++) = ' ';

    rb_str_set_len(str, ptr - buf);

    return str;
}

static VALUE
cbsubst_sym_to_subst(self, sym)
    VALUE self;
    VALUE sym;
{
    struct cbsubst_info *inf;
    VALUE str;
    int idx;
    ID id;
    volatile VALUE ret;

    if (!RB_TYPE_P(sym, T_SYMBOL)) return sym;

    inf = cbsubst_get_ptr(self);

    if (!NIL_P(ret = rb_hash_aref(inf->aliases, sym))) {
	str = rb_sym2str(ret);
    } else {
	str = rb_sym2str(sym);
    }

    id = rb_intern_str(rb_sprintf("@%"PRIsVALUE, str));

    for(idx = 0; idx < CBSUBST_TBL_MAX; idx++) {
      if (inf->ivar[idx] == id) break;
    }
    if (idx >= CBSUBST_TBL_MAX)  return sym;

    return cbsubst_append_inf_key(rb_str_new(0, 0), inf, idx);
}

static VALUE
cbsubst_get_subst_arg(argc, argv, self)
    int   argc;
    VALUE *argv;
    VALUE self;
{
    struct cbsubst_info *inf;
    VALUE str;
    int i, idx;
    ID id;
    VALUE arg_sym, ret, result;

    inf = cbsubst_get_ptr(self);

    result = rb_str_new(0, 0);
    for(i = 0; i < argc; i++) {
        switch(TYPE(argv[i])) {
        case T_STRING:
            str = argv[i];
            arg_sym = rb_check_symbol(&str);
            if (NIL_P(arg_sym)) goto not_found;
            break;
        case T_SYMBOL:
            arg_sym = argv[i];
            str = rb_sym2str(arg_sym);
            break;
        default:
            rb_raise(rb_eArgError, "arg #%d is not a String or a Symbol", i);
        }

        if (!NIL_P(ret = rb_hash_aref(inf->aliases, arg_sym))) {
            str = rb_sym2str(ret);
        }

	ret = rb_sprintf("@%"PRIsVALUE, str);
	id = rb_check_id(&ret);
	if (!id) goto not_found;

	for(idx = 0; idx < CBSUBST_TBL_MAX; idx++) {
	  if (inf->ivar[idx] == id) break;
	}
        if (idx >= CBSUBST_TBL_MAX) {
	  not_found:
            rb_raise(rb_eArgError, "cannot find attribute :%"PRIsVALUE, str);
        }

	result = cbsubst_append_inf_key(result, inf, idx);
    }

    return result;
}

static VALUE
cbsubst_get_subst_key(self, str)
    VALUE self;
    VALUE str;
{
    struct cbsubst_info *inf;
    VALUE list;
    VALUE ret;
    long i, len, keylen;
    int idx;
    char *buf, *ptr;

    list = rb_funcall(cTclTkLib, ID_split_tklist, 1, str);
    Check_Type(list, T_ARRAY);
    len = RARRAY_LEN(list);

    inf = cbsubst_get_ptr(self);

    ret = rb_str_new(0, len);
    ptr = buf = RSTRING_PTR(ret);

    for(i = 0; i < len; i++) {
      VALUE keyval = RARRAY_AREF(list, i);
      const char *key = (Check_Type(keyval, T_STRING), StringValueCStr(keyval));
      if (*key == '%') {
	if (*(key + 2) == '\0') {
	  /* single char */
	  *(ptr++) = *(key + 1);
	} else {
	  /* search longname-key */
	  keylen = RSTRING_LEN(keyval) - 1;
	  for(idx = 0; idx < CBSUBST_TBL_MAX; idx++) {
	    if (inf->keylen[idx] != keylen) continue;
	    if ((unsigned char)inf->key[idx][0] != (unsigned char)*(key + 1)) continue;
	    if (strncmp(inf->key[idx], key + 1, keylen)) continue;
	    break;
	  }
	  if (idx < CBSUBST_TBL_MAX) {
	    *(ptr++) = (unsigned char)idx;
	  } else {
	    *(ptr++) = ' ';
	  }
	}
      } else {
	*(ptr++) = ' ';
      }
    }

    rb_str_set_len(ret, ptr - buf);
    return ret;
}

static VALUE
cbsubst_get_all_subst_keys(self)
    VALUE self;
{
    struct cbsubst_info *inf;
    char *keys_buf, *keys_ptr;
    int idx;
    VALUE str, keys_str;

    inf = cbsubst_get_ptr(self);

    str = rb_str_new(0, 0);
    keys_str = rb_str_new(0, CBSUBST_TBL_MAX);
    keys_ptr = keys_buf = RSTRING_PTR(keys_str);

    for(idx = 0; idx < CBSUBST_TBL_MAX; idx++) {
      if (inf->ivar[idx] == (ID) 0) continue;

      *(keys_ptr++) = (unsigned char)idx;

      str = cbsubst_append_inf_key(str, inf, idx);
    }
    rb_str_set_len(keys_str, keys_ptr - keys_buf);

    return rb_ary_new3(2, keys_str, str);
}

static VALUE
cbsubst_table_setup(argc, argv, self)
     int   argc;
     VALUE *argv;
     VALUE self;
{
  VALUE cbsubst_obj;
  VALUE key_inf;
  VALUE longkey_inf;
  VALUE proc_inf;
  VALUE inf, subst, name, type, ivar, proc;
  const VALUE *infp;
  ID id;
  struct cbsubst_info *subst_inf;
  long idx;
  unsigned char chr;

  /* accept (key_inf, proc_inf) or (key_inf, longkey_inf, procinf) */
  if (rb_scan_args(argc, argv, "21", &key_inf, &longkey_inf, &proc_inf) == 2) {
    proc_inf = longkey_inf;
    longkey_inf = rb_ary_new();
  }
  Check_Type(key_inf, T_ARRAY);
  Check_Type(longkey_inf, T_ARRAY);
  Check_Type(proc_inf, T_ARRAY);

  /* check the number of longkeys */
  if (RARRAY_LEN(longkey_inf) > 125 /* from 0x80 to 0xFD */) {
    rb_raise(rb_eArgError, "too many longname-key definitions");
  }

  /* init */
  cbsubst_obj = allocate_cbsubst_info(&subst_inf);

  /*
   * keys : array of [subst, type, ivar]
   *         subst ==> char code or string
   *         type  ==> char code or string
   *         ivar  ==> symbol
   */
  for(idx = 0; idx < RARRAY_LEN(key_inf); idx++) {
    inf = RARRAY_AREF(key_inf, idx);
    if (!RB_TYPE_P(inf, T_ARRAY)) continue;
    if (RARRAY_LEN(inf) < 3) continue;
    infp = RARRAY_CONST_PTR(inf);
    subst = infp[0];
    type = infp[1];
    ivar = infp[2];

    chr = NUM2CHR(subst);
    subst_inf->type[chr] = NUM2CHR(type);

    subst_inf->full_subst_length += 3;

    id = SYM2ID(ivar);
    subst_inf->ivar[chr] = rb_intern_str(rb_sprintf("@%"PRIsVALUE, rb_id2str(id)));

    rb_attr(self, id, 1, 0, Qtrue);
  }
  RB_GC_GUARD(key_inf);


  /*
   * longkeys : array of [name, type, ivar]
   *         name ==> longname key string
   *         type ==> char code or string
   *         ivar ==> symbol
   */
  for(idx = 0; idx < RARRAY_LEN(longkey_inf); idx++) {
    inf = RARRAY_AREF(longkey_inf, idx);
    if (!RB_TYPE_P(inf, T_ARRAY)) continue;
    if (RARRAY_LEN(inf) < 3) continue;
    infp = RARRAY_CONST_PTR(inf);
    name = infp[0];
    type = infp[1];
    ivar = infp[2];

    Check_Type(name, T_STRING);
    chr = (unsigned char)(0x80 + idx);
    subst_inf->keylen[chr] = RSTRING_LEN(name);
    subst_inf->key[chr] = strndup(RSTRING_PTR(name),
				  RSTRING_LEN(name));
    subst_inf->type[chr] = NUM2CHR(type);

    subst_inf->full_subst_length += (subst_inf->keylen[chr] + 2);

    id = SYM2ID(ivar);
    subst_inf->ivar[chr] = rb_intern_str(rb_sprintf("@%"PRIsVALUE, rb_id2str(id)));

    rb_attr(self, id, 1, 0, Qtrue);
  }
  RB_GC_GUARD(longkey_inf);

  /*
   * procs : array of [type, proc]
   *         type  ==> char code or string
   *         proc  ==> proc/method/obj (must respond to 'call')
   */
  for(idx = 0; idx < RARRAY_LEN(proc_inf); idx++) {
    inf = RARRAY_AREF(proc_inf, idx);
    if (!RB_TYPE_P(inf, T_ARRAY)) continue;
    if (RARRAY_LEN(inf) < 2) continue;
    type = rb_ary_entry(inf, 0);
    proc = rb_ary_entry(inf, 1);
    if (RB_TYPE_P(type, T_STRING))
      type = INT2FIX(*(RSTRING_PTR(type)));
    rb_hash_aset(subst_inf->proc, type, proc);
  }
  RB_GC_GUARD(proc_inf);

  rb_const_set(self, ID_SUBST_INFO, cbsubst_obj);

  return self;
}

static VALUE
cbsubst_get_extra_args_tbl(self)
    VALUE self;
{
  return rb_ary_new();
}

static VALUE
cbsubst_scan_args(self, arg_key, val_ary)
    VALUE self;
    VALUE arg_key;
    VALUE val_ary;
{
    struct cbsubst_info *inf;
    long idx;
    unsigned char *keyptr = (unsigned char*)StringValueCStr(arg_key);
    long keylen = RSTRING_LEN(arg_key);
    long vallen = (Check_Type(val_ary, T_ARRAY), RARRAY_LEN(val_ary));
    unsigned char type_chr;
    volatile VALUE dst = rb_ary_new2(vallen);
    volatile VALUE proc;
    int thr_crit_bup;
    VALUE old_gc;

    thr_crit_bup = rb_thread_critical;
    rb_thread_critical = Qtrue;

    old_gc = rb_gc_disable();

    inf = cbsubst_get_ptr(self);

    for(idx = 0; idx < vallen; idx++) {
      if (idx >= keylen) {
	proc = Qnil;
      } else if (*(keyptr + idx) == ' ') {
	proc = Qnil;
      } else {
	if ((type_chr = inf->type[*(keyptr + idx)]) != 0) {
	  proc = rb_hash_aref(inf->proc, INT2FIX((int)type_chr));
	} else {
	  proc = Qnil;
	}
      }

      if (NIL_P(proc)) {
	rb_ary_push(dst, RARRAY_AREF(val_ary, idx));
      } else {
	rb_ary_push(dst, rb_funcall(proc, ID_call, 1,
				    RARRAY_AREF(val_ary, idx)));
      }
    }

    if (old_gc == Qfalse) rb_gc_enable();
    rb_thread_critical = thr_crit_bup;

    return dst;
}

static VALUE
cbsubst_inspect(self)
    VALUE self;
{
    return rb_str_new2("CallbackSubst");
}

static VALUE
substinfo_inspect(self)
    VALUE self;
{
    return rb_str_new2("SubstInfo");
}

/*************************************/

static VALUE
tk_cbe_inspect(self)
    VALUE self;
{
    return rb_str_new2("TkCallbackEntry");
}

/*************************************/

static VALUE
tkobj_path(self)
    VALUE self;
{
    return rb_ivar_get(self, ID_at_path);
}


/*************************************/
/* release date */
const char tkutil_release_date[] = TKUTIL_RELEASE_DATE;

void
Init_tkutil(void)
{
    VALUE cTK = rb_define_class("TkKernel", rb_cObject);
    VALUE mTK = rb_define_module("TkUtil");

    /* --------------------- */

    rb_define_const(mTK, "RELEASE_DATE",
                    rb_obj_freeze(rb_str_new2(tkutil_release_date)));

    /* --------------------- */
    rb_global_variable(&cMethod);
    cMethod = rb_const_get(rb_cObject, rb_intern("Method"));

    ID_path = rb_intern("path");
    ID_at_path = rb_intern("@path");
    ID_at_enc = rb_intern("@encoding");
    ID_to_eval = rb_intern("to_eval");
    ID_to_s = rb_intern("to_s");
    ID_source = rb_intern("source");
    ID_downcase = rb_intern("downcase");
    ID_install_cmd = rb_intern("install_cmd");
    ID_merge_tklist = rb_intern("_merge_tklist");
    ID_encoding = rb_intern("encoding");
    ID_encoding_system = rb_intern("encoding_system");
    ID_call = rb_intern("call");

    /* --------------------- */
    cCB_SUBST = rb_define_class_under(mTK, "CallbackSubst", rb_cObject);
    rb_define_singleton_method(cCB_SUBST, "inspect", cbsubst_inspect, 0);

    cSUBST_INFO = rb_define_class_under(cCB_SUBST, "Info", rb_cObject);
    rb_undef_alloc_func(cSUBST_INFO);
    rb_define_singleton_method(cSUBST_INFO, "inspect", substinfo_inspect, 0);

    ID_SUBST_INFO = rb_intern("SUBST_INFO");
    rb_define_singleton_method(cCB_SUBST, "ret_val", cbsubst_ret_val, 1);
    rb_define_singleton_method(cCB_SUBST, "scan_args", cbsubst_scan_args, 2);
    rb_define_singleton_method(cCB_SUBST, "_sym2subst",
			       cbsubst_sym_to_subst, 1);
    rb_define_singleton_method(cCB_SUBST, "subst_arg",
                               cbsubst_get_subst_arg, -1);
    rb_define_singleton_method(cCB_SUBST, "_get_subst_key",
                               cbsubst_get_subst_key,  1);
    rb_define_singleton_method(cCB_SUBST, "_get_all_subst_keys",
                               cbsubst_get_all_subst_keys,  0);
    rb_define_singleton_method(cCB_SUBST, "_setup_subst_table",
                               cbsubst_table_setup, -1);
    rb_define_singleton_method(cCB_SUBST, "_get_extra_args_tbl",
                               cbsubst_get_extra_args_tbl,  0);
    rb_define_singleton_method(cCB_SUBST, "_define_attribute_aliases",
                               cbsubst_def_attr_aliases,  1);

    rb_define_method(cCB_SUBST, "initialize", cbsubst_initialize, -1);

    cbsubst_init();

    /* --------------------- */
    rb_global_variable(&cTkCallbackEntry);
    cTkCallbackEntry = rb_define_class("TkCallbackEntry", cTK);
    rb_define_singleton_method(cTkCallbackEntry, "inspect", tk_cbe_inspect, 0);

    /* --------------------- */
    rb_global_variable(&cTkObject);
    cTkObject = rb_define_class("TkObject", cTK);
    rb_define_method(cTkObject, "path", tkobj_path, 0);

    /* --------------------- */
    rb_require("tcltklib");
    rb_global_variable(&cTclTkLib);
    cTclTkLib = rb_const_get(rb_cObject, rb_intern("TclTkLib"));
    ID_split_tklist = rb_intern("_split_tklist");
    ID_toUTF8 = rb_intern("_toUTF8");
    ID_fromUTF8 = rb_intern("_fromUTF8");

    /* --------------------- */
    rb_define_singleton_method(cTK, "new", tk_s_new, -1);

    /* --------------------- */
    rb_global_variable(&TK_None);
    TK_None = rb_obj_alloc(rb_cObject);
    rb_define_const(mTK, "None", TK_None);
    rb_define_singleton_method(TK_None, "to_s", tkNone_to_s, 0);
    rb_define_singleton_method(TK_None, "inspect", tkNone_inspect, 0);
    OBJ_FREEZE(TK_None);

    /* --------------------- */
    rb_global_variable(&CALLBACK_TABLE);
    CALLBACK_TABLE = rb_hash_new();

    /* --------------------- */
    rb_define_singleton_method(mTK, "untrust", tk_obj_untrust, 1);

    rb_define_singleton_method(mTK, "eval_cmd", tk_eval_cmd, -1);
    rb_define_singleton_method(mTK, "callback", tk_do_callback, -1);
    rb_define_singleton_method(mTK, "install_cmd", tk_install_cmd, -1);
    rb_define_singleton_method(mTK, "uninstall_cmd", tk_uninstall_cmd, 1);
    rb_define_singleton_method(mTK, "_symbolkey2str", tk_symbolkey2str, 1);
    rb_define_singleton_method(mTK, "hash_kv", tk_hash_kv, -1);
    rb_define_singleton_method(mTK, "_get_eval_string",
                               tk_get_eval_string, -1);
    rb_define_singleton_method(mTK, "_get_eval_enc_str",
                               tk_get_eval_enc_str, 1);
    rb_define_singleton_method(mTK, "_conv_args", tk_conv_args, -1);

    rb_define_singleton_method(mTK, "bool", tcl2rb_bool, 1);
    rb_define_singleton_method(mTK, "number", tcl2rb_number, 1);
    rb_define_singleton_method(mTK, "string", tcl2rb_string, 1);
    rb_define_singleton_method(mTK, "num_or_str", tcl2rb_num_or_str, 1);
    rb_define_singleton_method(mTK, "num_or_nil", tcl2rb_num_or_nil, 1);

    rb_define_method(mTK, "_toUTF8", tk_toUTF8, -1);
    rb_define_method(mTK, "_fromUTF8", tk_fromUTF8, -1);
    rb_define_method(mTK, "_symbolkey2str", tk_symbolkey2str, 1);
    rb_define_method(mTK, "hash_kv", tk_hash_kv, -1);
    rb_define_method(mTK, "_get_eval_string", tk_get_eval_string, -1);
    rb_define_method(mTK, "_get_eval_enc_str", tk_get_eval_enc_str, 1);
    rb_define_method(mTK, "_conv_args", tk_conv_args, -1);

    rb_define_method(mTK, "bool", tcl2rb_bool, 1);
    rb_define_method(mTK, "number", tcl2rb_number, 1);
    rb_define_method(mTK, "string", tcl2rb_string, 1);
    rb_define_method(mTK, "num_or_str", tcl2rb_num_or_str, 1);
    rb_define_method(mTK, "num_or_nil", tcl2rb_num_or_nil, 1);

    /* --------------------- */
    rb_global_variable(&ENCODING_NAME_UTF8);
    ENCODING_NAME_UTF8 = rb_obj_freeze(rb_str_new2("utf-8"));

    /* --------------------- */
}
