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Unicode::Map8 0.12

  Date Added: March 06, 2010  |  Visits: 762


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Unicode::Map8 is a mapping table between 8-bit chars and Unicode. SYNOPSIS require Unicode::Map8; my $no_map = Unicode::Map8->new("ISO646-NO") || die; my $l1_map = Unicode::Map8->new("latin1") || die; my $ustr = $no_map->to16("V}re norske tegn b|r {resn"); my $lstr = $l1_map->to8($ustr); print $lstr; print $no_map->tou("V}re norske tegn b|r {resn")->utf8 The Unicode::Map8 class implement efficient mapping tables between 8-bit character sets and 16 bit character sets like Unicode. The tables are efficient both in terms of space allocated and translation speed. The 16-bit strings is assumed to use network byte order. The following methods are available: $m = Unicode::Map8->new( [$charset] ) The object constructor creates new instances of the Unicode::Map8 class. I takes an optional argument that specify then name of a 8-bit character set to initialize mappings from. The argument can also be a the name of a mapping file. If the charset/file can not be located, then the constructor returns undef. If you omit the argument, then an empty mapping table is constructed. You must then add mapping pairs to it using the addpair() method described below. $m->addpair( $u8, $u16 ); Adds a new mapping pair to the mapping object. It takes two arguments. The first is the code value in the 8-bit character set and the second is the corresponding code value in the 16-bit character set. The same codes can be used multiple times (but using the same pair has no effect). The first definition for a code is the one that is used. Consider the following example: $m->addpair(0x20, 0x0020); $m->addpair(0x20, 0x00A0); $m->addpair(0xA0, 0x00A0); It means that the character 0x20 and 0xA0 in the 8-bit charset maps to themselves in the 16-bit set, but in the 16-bit character set 0x0A0 maps to 0x20. $m->default_to8( $u8 ) Set the code of the default character to use when mapping from 16-bit to 8-bit strings. If there is no mapping pair defined for a character then this default is substituted by to8() and recode8(). $m->default_to16( $u16 ) Set the code of the default character to use when mapping from 8-bit to 16-bit strings. If there is no mapping pair defined for a character then this default is used by to16(), tou() and recode8(). $m->nostrict; All undefined mappings are replaced with the identity mapping. Undefined character are normally just removed (or replaced with the default if defined) when converting between character sets. $m->to8( $ustr ); Converts a 16-bit character string to the corresponding string in the 8-bit character set. $m->to16( $str ); Converts a 8-bit character string to the corresponding string in the 16-bit character set. $m->tou( $str ); Same an to16() but return a Unicode::String object instead of a plain UCS2 string. $m->recode8($m2, $str); Map the string $str from one 8-bit character set ($m) to another one ($m2). Since we assume we know the mappings towards the common 16-bit encoding we can use this to convert between any of the 8-bit character sets. $m->to_char16( $u8 ) Maps a single 8-bit character code to an 16-bit code. If the 8-bit character is unmapped then the constant NOCHAR is returned. The default is not used and the callback method is not invoked. $m->to_char8( $u16 ) Maps a single 16-bit character code to an 8-bit code. If the 16-bit character is unmapped then the constant NOCHAR is returned. The default is not used and the callback method is not invoked. The following callback methods are available. You can override these methods by creating a subclass of Unicode::Map8. $m->unmapped_to8 When mapping to 8-bit character string and there is no mapping defined (and no default either), then this method is called as the last resort. It is called with a single integer argument which is the code of the unmapped 16-bit character. It is expected to return a string that will be incorporated in the 8-bit string. The default version of this method always returns an empty string. Example: package MyMapper; @ISA=qw(Unicode::Map8); sub unmapped_to8 { my($self, $code) = @_; require Unicode::CharName; "<" . Unicode::CharName::uname($code) . ">"; } $m->unmapped_to16 Likewise when mapping to 16-bit character string and no mapping is defined then this method is called. It should return a 16-bit string with the bytes in network byte order. The default version of this method always returns an empty string..

Requirements: No special requirements
Platforms: Linux
Keyword: Character Character Set Character Sets Character String Libraries M- Mapping Mapping Table No Mapping Programming String
Users rating: 0/10

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