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class method

Encoding::Converter.new

Encoding::Converter.new(source_encoding, destination_encoding)

Encoding::Converter.new(source_encoding, destination_encoding, opt)

Encoding::Converter.new(convpath)

static VALUE
econv_init(int argc, VALUE *argv, VALUE self)
{
    VALUE ecopts;
    VALUE snamev, dnamev;
    const char *sname, *dname;
    rb_encoding *senc, *denc;
    rb_econv_t *ec;
    int ecflags;
    VALUE convpath;

    if (rb_check_typeddata(self, &econv_data_type)) {
        rb_raise(rb_eTypeError, "already initialized");
    }

    if (argc == 1 && !NIL_P(convpath = rb_check_array_type(argv[0]))) {
        ec = rb_econv_init_by_convpath(self, convpath, &sname, &dname, &senc, &denc);
        ecflags = 0;
        ecopts = Qnil;
    }
    else {
        econv_args(argc, argv, &snamev, &dnamev, &sname, &dname, &senc, &denc, &ecflags, &ecopts);
        ec = rb_econv_open_opts(sname, dname, ecflags, ecopts);
    }

    if (!ec) {
        VALUE exc = rb_econv_open_exc(sname, dname, ecflags);
        RB_GC_GUARD(snamev);
        RB_GC_GUARD(dnamev);
        rb_exc_raise(exc);
    }

    if (!DECORATOR_P(sname, dname)) {
        if (!senc)
            senc = make_dummy_encoding(sname);
        if (!denc)
            denc = make_dummy_encoding(dname);
        RB_GC_GUARD(snamev);
        RB_GC_GUARD(dnamev);
    }

    ec->source_encoding = senc;
    ec->destination_encoding = denc;

    DATA_PTR(self) = ec;

    return self;
}

possible options elements:

hash form:
  :invalid => nil            # raise error on invalid byte sequence (default)
  :invalid => :replace       # replace invalid byte sequence
  :undef => nil              # raise error on undefined conversion (default)
  :undef => :replace         # replace undefined conversion
  :replace => string         # replacement string ("?" or "\uFFFD" if not specified)
  :newline => :universal     # decorator for converting CRLF and CR to LF
  :newline => :crlf          # decorator for converting LF to CRLF
  :newline => :cr            # decorator for converting LF to CR
  :universal_newline => true # decorator for converting CRLF and CR to LF
  :crlf_newline => true      # decorator for converting LF to CRLF
  :cr_newline => true        # decorator for converting LF to CR
  :xml => :text              # escape as XML CharData.
  :xml => :attr              # escape as XML AttValue
integer form:
  Encoding::Converter::INVALID_REPLACE
  Encoding::Converter::UNDEF_REPLACE
  Encoding::Converter::UNDEF_HEX_CHARREF
  Encoding::Converter::UNIVERSAL_NEWLINE_DECORATOR
  Encoding::Converter::CRLF_NEWLINE_DECORATOR
  Encoding::Converter::CR_NEWLINE_DECORATOR
  Encoding::Converter::XML_TEXT_DECORATOR
  Encoding::Converter::XML_ATTR_CONTENT_DECORATOR
  Encoding::Converter::XML_ATTR_QUOTE_DECORATOR

Encoding::Converter.new creates an instance of Encoding::Converter.

Source_encoding and destination_encoding should be a string or Encoding object.

opt should be nil, a hash or an integer.

convpath should be an array. convpath may contain

two-element arrays which contain encodings or encoding names, or
strings representing decorator names.

Encoding::Converter.new optionally takes an option. The option should be a hash or an integer. The option hash can contain :invalid => nil, etc. The option integer should be logical-or of constants such as Encoding::Converter::INVALID_REPLACE, etc.

:invalid => nil

Raise error on invalid byte sequence. This is a default behavior.

:invalid => :replace

Replace invalid byte sequence by replacement string.

:undef => nil

Raise an error if a character in source_encoding is not defined in destination_encoding. This is a default behavior.

:undef => :replace

Replace undefined character in destination_encoding with replacement string.

:replace => string

Specify the replacement string. If not specified, “\uFFFD” is used for Unicode encodings and “?” for others.

:universal_newline => true

Convert CRLF and CR to LF.

:crlf_newline => true

Convert LF to CRLF.

:cr_newline => true

Convert LF to CR.

:xml => :text

Escape as XML CharData. This form can be used as an HTML 4.0 PCDATA.

‘&’ -> ‘&’
‘<’ -> ‘<’
‘>’ -> ‘>’
undefined characters in destination_encoding -> hexadecimal CharRef such as &#xHH;

:xml => :attr

Escape as XML AttValue. The converted result is quoted as “…”. This form can be used as an HTML 4.0 attribute value.

‘&’ -> ‘&’
‘<’ -> ‘<’
‘>’ -> ‘>’
‘“’ -> ‘"’
undefined characters in destination_encoding -> hexadecimal CharRef such as &#xHH;

Examples:

Example

# UTF-16BE to UTF-8
ec = Encoding::Converter.new("UTF-16BE", "UTF-8")

# Usually, decorators such as newline conversion are inserted last.
ec = Encoding::Converter.new("UTF-16BE", "UTF-8", :universal_newline => true)
p ec.convpath #=> [[#<Encoding:UTF-16BE>, #<Encoding:UTF-8>],
              #    "universal_newline"]

# But, if the last encoding is ASCII incompatible,
# decorators are inserted before the last conversion.
ec = Encoding::Converter.new("UTF-8", "UTF-16BE", :crlf_newline => true)
p ec.convpath #=> ["crlf_newline",
              #    [#<Encoding:UTF-8>, #<Encoding:UTF-16BE>]]

# Conversion path can be specified directly.
ec = Encoding::Converter.new(["universal_newline", ["EUC-JP", "UTF-8"], ["UTF-8", "UTF-16BE"]])
p ec.convpath #=> ["universal_newline",
              #    [#<Encoding:EUC-JP>, #<Encoding:UTF-8>],
              #    [#<Encoding:UTF-8>, #<Encoding:UTF-16BE>]]

See also .asciicompat_encoding .search_convpath #== also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0

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