Class: Encoding

Inherits:
Object show all
Defined in:
encoding.c,
transcode.c

Defined Under Namespace

Classes: CompatibilityError, Converter, ConverterNotFoundError, InvalidByteSequenceError, UndefinedConversionError

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

._loadObject

:nodoc:


# File 'encoding.c'

/* :nodoc: */
static VALUE
enc_load(VALUE klass, VALUE str)
{
    return enc_find(klass, str);
}

.aliasesObject

Returns the hash of available encoding alias and original encoding name.

Encoding.aliases
#=> {"BINARY"=>"ASCII-8BIT", "ASCII"=>"US-ASCII", "ANSI_X3.4-1986"=>"US-ASCII",
      "SJIS"=>"Shift_JIS", "eucJP"=>"EUC-JP", "CP932"=>"Windows-31J"}

# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.aliases -> {"alias1" => "orig1", "alias2" => "orig2", ...}
 *
 * Returns the hash of available encoding alias and original encoding name.
 *
 *   Encoding.aliases
 *   #=> {"BINARY"=>"ASCII-8BIT", "ASCII"=>"US-ASCII", "ANSI_X3.4-1986"=>"US-ASCII",
 *         "SJIS"=>"Shift_JIS", "eucJP"=>"EUC-JP", "CP932"=>"Windows-31J"}
 *
 */

static VALUE
rb_enc_aliases(VALUE klass)
{
    VALUE aliases[2];
    aliases[0] = rb_hash_new();
    aliases[1] = rb_ary_new();
    st_foreach(enc_table.names, rb_enc_aliases_enc_i, (st_data_t)aliases);
    return aliases[0];
}

.compatible?(str1, str2) ⇒ nil

Checks the compatibility of two strings. If they are compatible, means concatenatable, returns an encoding which the concatenated string will be. If they are not compatible, nil is returned.

Encoding.compatible?("\xa1".force_encoding("iso-8859-1"), "b")
#=> #<Encoding:ISO-8859-1>

Encoding.compatible?(
  "\xa1".force_encoding("iso-8859-1"),
  "\xa1\xa1".force_encoding("euc-jp"))
#=> nil

Returns:

  • (nil)

# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.compatible?(str1, str2) -> enc or nil
 *
 * Checks the compatibility of two strings.
 * If they are compatible, means concatenatable,
 * returns an encoding which the concatenated string will be.
 * If they are not compatible, nil is returned.
 *
 *   Encoding.compatible?("\xa1".force_encoding("iso-8859-1"), "b")
 *   #=> #<Encoding:ISO-8859-1>
 *
 *   Encoding.compatible?(
 *     "\xa1".force_encoding("iso-8859-1"),
 *     "\xa1\xa1".force_encoding("euc-jp"))
 *   #=> nil
 *
 */
static VALUE
enc_compatible_p(VALUE klass, VALUE str1, VALUE str2)
{
    rb_encoding *enc;

    if (!enc_capable(str1)) return Qnil;
    if (!enc_capable(str2)) return Qnil;
    enc = rb_enc_compatible(str1, str2);
    if (!enc) return Qnil;
    return rb_enc_from_encoding(enc);
}

.default_externalObject

Returns default external encoding.

It is initialized by the locale or -E option.


# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.default_external -> enc
 *
 * Returns default external encoding.
 *
 * It is initialized by the locale or -E option.
 */
static VALUE
get_default_external(VALUE klass)
{
    return rb_enc_default_external();
}

.default_external=(enc) ⇒ Object

Sets default external encoding.


# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.default_external = enc
 *
 * Sets default external encoding.
 */
static VALUE
set_default_external(VALUE klass, VALUE encoding)
{
    rb_warning("setting Encoding.default_external");
    rb_enc_set_default_external(encoding);
    return encoding;
}

.default_internalObject

Returns default internal encoding.

It is initialized by the source internal_encoding or -E option.


# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.default_internal -> enc
 *
 * Returns default internal encoding.
 *
 * It is initialized by the source internal_encoding or -E option.
 */
static VALUE
get_default_internal(VALUE klass)
{
    return rb_enc_default_internal();
}

.default_internal=(enc) ⇒ Object

Sets default internal encoding. Or removes default internal encoding when passed nil.


# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.default_internal = enc or nil
 *
 * Sets default internal encoding.
 * Or removes default internal encoding when passed nil.
 */
static VALUE
set_default_internal(VALUE klass, VALUE encoding)
{
    rb_warning("setting Encoding.default_internal");
    rb_enc_set_default_internal(encoding);
    return encoding;
}

.find(string) ⇒ Object .find(symbol) ⇒ Object

Search the encoding with specified name. name should be a string or symbol.

Encoding.find("US-ASCII")  #=> #<Encoding:US-ASCII>
Encoding.find(:Shift_JIS)  #=> #<Encoding:Shift_JIS>

Names which this method accept are encoding names and aliases including following special aliases

"external"

default external encoding

"internal"

default internal encoding

"locale"

locale encoding

"filesystem"

filesystem encoding

An ArgumentError is raised when no encoding with name. Only Encoding.find("internal") however returns nil when no encoding named "internal", in other words, when Ruby has no default internal encoding.


# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.find(string) -> enc
 *   Encoding.find(symbol) -> enc
 *
 * Search the encoding with specified <i>name</i>.
 * <i>name</i> should be a string or symbol.
 *
 *   Encoding.find("US-ASCII")  #=> #<Encoding:US-ASCII>
 *   Encoding.find(:Shift_JIS)  #=> #<Encoding:Shift_JIS>
 *
 * Names which this method accept are encoding names and aliases
 * including following special aliases
 *
 * "external"::   default external encoding
 * "internal"::   default internal encoding
 * "locale"::     locale encoding
 * "filesystem":: filesystem encoding
 *
 * An ArgumentError is raised when no encoding with <i>name</i>.
 * Only <code>Encoding.find("internal")</code> however returns nil
 * when no encoding named "internal", in other words, when Ruby has no
 * default internal encoding.
 */
static VALUE
enc_find(VALUE klass, VALUE enc)
{
    return rb_enc_from_encoding(to_encoding(enc));
}

.listArray

Returns the list of loaded encodings.

Encoding.list
#=> [#<Encoding:ASCII-8BIT>, #<Encoding:UTF-8>,
      #<Encoding:ISO-2022-JP (dummy)>]

Encoding.find("US-ASCII")
#=> #<Encoding:US-ASCII>

Encoding.list
#=> [#<Encoding:ASCII-8BIT>, #<Encoding:UTF-8>,
      #<Encoding:US-ASCII>, #<Encoding:ISO-2022-JP (dummy)>]

Returns:


# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.list -> [enc1, enc2, ...]
 *
 * Returns the list of loaded encodings.
 *
 *   Encoding.list
 *   #=> [#<Encoding:ASCII-8BIT>, #<Encoding:UTF-8>,
 *         #<Encoding:ISO-2022-JP (dummy)>]
 *
 *   Encoding.find("US-ASCII")
 *   #=> #<Encoding:US-ASCII>
 *
 *   Encoding.list
 *   #=> [#<Encoding:ASCII-8BIT>, #<Encoding:UTF-8>,
 *         #<Encoding:US-ASCII>, #<Encoding:ISO-2022-JP (dummy)>]
 *
 */
static VALUE
enc_list(VALUE klass)
{
    VALUE ary = rb_ary_new2(0);
    rb_ary_replace(ary, rb_encoding_list);
    return ary;
}

.locale_charmapString

Returns the locale charmap name.

Debian GNU/Linux
  LANG=C
    Encoding.locale_charmap  #=> "ANSI_X3.4-1968"
  LANG=ja_JP.EUC-JP
    Encoding.locale_charmap  #=> "EUC-JP"

SunOS 5
  LANG=C
    Encoding.locale_charmap  #=> "646"
  LANG=ja
    Encoding.locale_charmap  #=> "eucJP"

The result is highly platform dependent. So Encoding.find(Encoding.locale_charmap) may cause an error. If you need some encoding object even for unknown locale, Encoding.find("locale") can be used.

Returns:


# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.locale_charmap -> string
 *
 * Returns the locale charmap name.
 *
 *   Debian GNU/Linux
 *     LANG=C
 *       Encoding.locale_charmap  #=> "ANSI_X3.4-1968"
 *     LANG=ja_JP.EUC-JP
 *       Encoding.locale_charmap  #=> "EUC-JP"
 *
 *   SunOS 5
 *     LANG=C
 *       Encoding.locale_charmap  #=> "646"
 *     LANG=ja
 *       Encoding.locale_charmap  #=> "eucJP"
 *
 * The result is highly platform dependent.
 * So Encoding.find(Encoding.locale_charmap) may cause an error.
 * If you need some encoding object even for unknown locale,
 * Encoding.find("locale") can be used.
 *
 */
VALUE
rb_locale_charmap(VALUE klass)
{
#if defined NO_LOCALE_CHARMAP
    return rb_usascii_str_new2("ASCII-8BIT");
#elif defined _WIN32 || defined __CYGWIN__
    const char *nl_langinfo_codeset(void);
    const char *codeset = nl_langinfo_codeset();
    char cp[sizeof(int) * 3 + 4];
    if (!codeset) {
    snprintf(cp, sizeof(cp), "CP%d", GetConsoleCP());
    codeset = cp;
    }
    return rb_usascii_str_new2(codeset);
#elif defined HAVE_LANGINFO_H
    char *codeset;
    codeset = nl_langinfo(CODESET);
    return rb_usascii_str_new2(codeset);
#else
    return Qnil;
#endif
}

.name_listArray

Returns the list of available encoding names.

Encoding.name_list
#=> ["US-ASCII", "ASCII-8BIT", "UTF-8",
      "ISO-8859-1", "Shift_JIS", "EUC-JP",
      "Windows-31J",
      "BINARY", "CP932", "eucJP"]

Returns:


# File 'encoding.c'

/*
 * call-seq:
 *   Encoding.name_list -> ["enc1", "enc2", ...]
 *
 * Returns the list of available encoding names.
 *
 *   Encoding.name_list
 *   #=> ["US-ASCII", "ASCII-8BIT", "UTF-8",
 *         "ISO-8859-1", "Shift_JIS", "EUC-JP",
 *         "Windows-31J",
 *         "BINARY", "CP932", "eucJP"]
 *
 */

static VALUE
rb_enc_name_list(VALUE klass)
{
    VALUE ary = rb_ary_new2(enc_table.names->num_entries);
    st_foreach(enc_table.names, rb_enc_name_list_i, (st_data_t)ary);
    return ary;
}

Instance Method Details

#_dumpObject

:nodoc:


# File 'encoding.c'

/* :nodoc: */
static VALUE
enc_dump(int argc, VALUE *argv, VALUE self)
{
    rb_scan_args(argc, argv, "01", 0);
    return enc_name(self);
}

#ascii_compatible?Boolean

Returns whether ASCII-compatible or not.

Encoding::UTF_8.ascii_compatible?     #=> true
Encoding::UTF_16BE.ascii_compatible?  #=> false

Returns:

  • (Boolean)

# File 'encoding.c'

/*
 * call-seq:
 *   enc.ascii_compatible? -> true or false
 *
 * Returns whether ASCII-compatible or not.
 *
 *   Encoding::UTF_8.ascii_compatible?     #=> true
 *   Encoding::UTF_16BE.ascii_compatible?  #=> false
 *
 */
static VALUE
enc_ascii_compatible_p(VALUE enc)
{
    return rb_enc_asciicompat(enc_table.list[must_encoding(enc)].enc) ? Qtrue : Qfalse;
}

#dummy?Boolean

Returns true for dummy encodings. A dummy encoding is an encoding for which character handling is not properly implemented. It is used for stateful encodings.

Encoding::ISO_2022_JP.dummy?       #=> true
Encoding::UTF_8.dummy?             #=> false

Returns:

  • (Boolean)

# File 'encoding.c'

/*
 * call-seq:
 *   enc.dummy? -> true or false
 *
 * Returns true for dummy encodings.
 * A dummy encoding is an encoding for which character handling is not properly
 * implemented.
 * It is used for stateful encodings.
 *
 *   Encoding::ISO_2022_JP.dummy?       #=> true
 *   Encoding::UTF_8.dummy?             #=> false
 *
 */
static VALUE
enc_dummy_p(VALUE enc)
{
    return ENC_DUMMY_P(enc_table.list[must_encoding(enc)].enc) ? Qtrue : Qfalse;
}

#inspectString

Returns a string which represents the encoding for programmers.

Encoding::UTF_8.inspect       #=> "#<Encoding:UTF-8>"
Encoding::ISO_2022_JP.inspect #=> "#<Encoding:ISO-2022-JP (dummy)>"

Returns:


# File 'encoding.c'

/*
 * call-seq:
 *   enc.inspect -> string
 *
 * Returns a string which represents the encoding for programmers.
 *
 *   Encoding::UTF_8.inspect       #=> "#<Encoding:UTF-8>"
 *   Encoding::ISO_2022_JP.inspect #=> "#<Encoding:ISO-2022-JP (dummy)>"
 */
static VALUE
enc_inspect(VALUE self)
{
    VALUE str = rb_sprintf("#<%s:%s%s>", rb_obj_classname(self),
              rb_enc_name((rb_encoding*)DATA_PTR(self)),
              (enc_dummy_p(self) ? " (dummy)" : ""));
    ENCODING_CODERANGE_SET(str, rb_usascii_encindex(), ENC_CODERANGE_7BIT);
    return str;
}

#nameString

Returns the name of the encoding.

Encoding::UTF_8.name      #=> "UTF-8"

Returns:


# File 'encoding.c'

/*
 * call-seq:
 *   enc.name -> string
 *
 * Returns the name of the encoding.
 *
 *   Encoding::UTF_8.name      #=> "UTF-8"
 */
static VALUE
enc_name(VALUE self)
{
    return rb_usascii_str_new2(rb_enc_name((rb_encoding*)DATA_PTR(self)));
}

#namesArray

Returns the list of name and aliases of the encoding.

Encoding::WINDOWS_31J.names  #=> ["Windows-31J", "CP932", "csWindows31J"]

Returns:


# File 'encoding.c'

/*
 * call-seq:
 *   enc.names -> array
 *
 * Returns the list of name and aliases of the encoding.
 *
 *   Encoding::WINDOWS_31J.names  #=> ["Windows-31J", "CP932", "csWindows31J"]
 */
static VALUE
enc_names(VALUE self)
{
    VALUE args[2];

    args[0] = (VALUE)rb_to_encoding_index(self);
    args[1] = rb_ary_new2(0);
    st_foreach(enc_table.names, enc_names_i, (st_data_t)args);
    return args[1];
}

#replicate(name) ⇒ Encoding

Returns a replicated encoding of enc whose name is name. The new encoding should have the same byte structure of enc. If name is used by another encoding, raise ArgumentError.

Returns:


# File 'encoding.c'

/*
 * call-seq:
 *   enc.replicate(name) -> encoding
 *
 * Returns a replicated encoding of _enc_ whose name is _name_.
 * The new encoding should have the same byte structure of _enc_.
 * If _name_ is used by another encoding, raise ArgumentError.
 *
 */
static VALUE
enc_replicate(VALUE encoding, VALUE name)
{
    return rb_enc_from_encoding_index(
    rb_enc_replicate(StringValueCStr(name),
             rb_to_encoding(encoding)));
}

#nameString

Returns the name of the encoding.

Encoding::UTF_8.name      #=> "UTF-8"

Returns:


# File 'encoding.c'

/*
 * call-seq:
 *   enc.name -> string
 *
 * Returns the name of the encoding.
 *
 *   Encoding::UTF_8.name      #=> "UTF-8"
 */
static VALUE
enc_name(VALUE self)
{
    return rb_usascii_str_new2(rb_enc_name((rb_encoding*)DATA_PTR(self)));
}