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1 | package utf8; |
2 | |
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3 | |
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4 | $utf8::hint_bits = 0x00800000; |
5 | |
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6 | our $VERSION = '1.00'; |
7 | |
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8 | sub import { |
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9 | $^H |= $utf8::hint_bits; |
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10 | $enc{caller()} = $_[1] if $_[1]; |
11 | } |
12 | |
13 | sub unimport { |
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14 | $^H &= ~$utf8::hint_bits; |
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15 | } |
16 | |
17 | sub AUTOLOAD { |
18 | require "utf8_heavy.pl"; |
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19 | goto &$AUTOLOAD if defined &$AUTOLOAD; |
20 | Carp::croak("Undefined subroutine $AUTOLOAD called"); |
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21 | } |
22 | |
23 | 1; |
24 | __END__ |
25 | |
26 | =head1 NAME |
27 | |
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28 | utf8 - Perl pragma to enable/disable UTF-8 (or UTF-EBCDIC) in source code |
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29 | |
30 | =head1 SYNOPSIS |
31 | |
32 | use utf8; |
33 | no utf8; |
34 | |
35 | =head1 DESCRIPTION |
36 | |
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37 | WARNING: The implementation of Unicode support in Perl is incomplete. |
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38 | See L<perlunicode> for the exact details. |
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39 | |
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40 | The C<use utf8> pragma tells the Perl parser to allow UTF-8 in the |
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41 | program text in the current lexical scope (allow UTF-EBCDIC on EBCDIC based |
42 | platforms). The C<no utf8> pragma tells Perl to switch back to treating |
43 | the source text as literal bytes in the current lexical scope. |
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44 | |
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45 | This pragma is primarily a compatibility device. Perl versions |
46 | earlier than 5.6 allowed arbitrary bytes in source code, whereas |
47 | in future we would like to standardize on the UTF-8 encoding for |
48 | source text. Until UTF-8 becomes the default format for source |
49 | text, this pragma should be used to recognize UTF-8 in the source. |
50 | When UTF-8 becomes the standard source format, this pragma will |
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51 | effectively become a no-op. For convenience in what follows the |
52 | term UTF-X is used to refer to UTF-8 on ASCII and ISO Latin based |
53 | platforms and UTF-EBCDIC on EBCDIC based platforms. |
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54 | |
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55 | Enabling the C<utf8> pragma has the following effects: |
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56 | |
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57 | =over 4 |
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58 | |
59 | =item * |
60 | |
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61 | Bytes in the source text that have their high-bit set will be treated |
62 | as being part of a literal UTF-8 character. This includes most literals |
63 | such as identifiers, string constants, constant regular expression patterns |
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64 | and package names. On EBCDIC platforms, characters in the C1 control group |
65 | and the Latin 1 character set are treated as being part of a literal |
66 | UTF-EBCDIC character. |
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67 | |
68 | =item * |
69 | |
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70 | In the absence of inputs marked as UTF-X, regular expressions within the |
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71 | scope of this pragma will default to using character semantics instead |
72 | of byte semantics. |
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73 | |
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74 | @bytes_or_chars = split //, $data; # may split to bytes if data |
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75 | # $data isn't UTF-X |
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76 | { |
77 | use utf8; # force char semantics |
78 | @chars = split //, $data; # splits characters |
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79 | } |
80 | |
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81 | =back |
82 | |
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83 | =head2 Utility functions |
84 | |
85 | The following functions are defined in the C<utf8::> package by the perl core. |
86 | |
87 | =over 4 |
88 | |
89 | =item * $num_octets = utf8::upgrade($string); |
90 | |
91 | Converts internal representation of string to the perls internal UTF-X form. |
92 | Returns the number of octets necessary to represent the string as UTF-X. |
93 | |
94 | =item * utf8::downgrade($string[, CHECK]) |
95 | |
96 | Converts internal representation of string to be un-encoded bytes. |
97 | |
98 | =item * utf8::encode($string) |
99 | |
100 | Converts (in-place) I<$string> from logical characters to octet sequence |
101 | representing it in perl's UTF-X encoding. |
102 | |
103 | =item * $flag = utf8::decode($string) |
104 | |
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105 | Attempts to convert I<$string> in-place from perl's UTF-X encoding into logical characters. |
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106 | |
107 | =back |
108 | |
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109 | =head1 SEE ALSO |
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110 | |
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111 | L<perlunicode>, L<bytes> |
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112 | |
113 | =cut |