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wakaba |
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=head1 NAME |
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Message::Field::Token --- Message-pm: Lexical tokens used in Internet message formats |
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=head1 DESCRIPTION |
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This module provides functions for handling lexical tokens of Internet message formats, |
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such as quoted-string, comment, etc. |
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This module is part of Message::* Perl Modules. |
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=cut |
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package Message::Field::Token; |
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use strict; |
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our $VERSION=do{my @r=(q$Revision: 1.12 $=~/\d+/g);sprintf "%d."."%02d" x $#r,@r}; |
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=head1 $phrase = Message::Field::Token::en_phrase ($string, %option) |
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Return given string (in internal code) as a phrase (= atom / quoted-string / encoded-word). |
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Options: |
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=over 4 |
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=item -charset => charset (default: 'us-ascii') |
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Charset name (in lower cases) to be used to encode the output string. |
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=item -ebcdic_safe |
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=item -encode_encoded_word_like |
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=item -quoted_pair |
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=item -token_maxlength |
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=item -unsafe_char => 1*CHAR / '' (default) |
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See options of C<en_quoted_string>. |
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=item -source_charset => charset (default = *internal) |
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Charset name (in lower case) of given string. |
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=back |
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=cut |
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sub en_phrase ($;%) { |
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my $string = shift; |
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my %option = @_; |
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my @string = split /(?<=[^\x09\x20])(?=[\x09\x20])/, $string; |
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my @str = ([0, '']); |
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for my $i (0..$#string) { |
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if (Message::MIME::Charset::is_representable_in ($option{-charset}, $string[$i], \%option) && $string[$i] !~ /[\x00\x0A\x0D]/) { |
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if ($str[$#str]->[0]) { ## Preceding token should be encoded |
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push @str, [0, $string[$i]]; |
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} else { ## Preceding token need not be encoded |
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$str[$#str]->[1] .= $string[$i]; |
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} |
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} else { ## Should be encoded |
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if ($str[$#str]->[0]) { ## Preceding token should be encoded |
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$str[$#str]->[1] .= $string[$i]; |
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} else { ## Preceding token need not be encoded |
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push @str, [1, $string[$i]]; |
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} |
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} |
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} |
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my $phrase = ''; |
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for my $i (0..$#str) { |
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my $ws = ''; $ws = $1 if $i != 0 && $str[$i]->[1] =~ s/^([\x09\x20])//; |
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if ($str[$i]->[0]) { |
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$str[$i]->[1] = Message::MIME::EncodedWord::encode ($str[$i]->[1], %option, -context => 'phrase', -encode_char => '\x00-\x7F'); |
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} else { |
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$str[$i]->[1] = _to_quoted_string ($str[$i]->[1], \%option); |
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} |
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$phrase .= $ws . $str[$i]->[1]; |
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} |
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$phrase; |
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} |
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=head1 $quoted_string = Message::Field::Token::en_quoted_string ($string, %option) |
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Quote string as a quoted-string if necessary. |
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Options: |
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=over 4 |
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=item -charset => charset (default: 'us-ascii') |
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Charset name (in lower cases) to be used to encode the output string. |
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=item -context => 'quoted_string' (default) / 'atom' / 'token' / 'http_token' / 'attr_char' / 'http_attr_char' |
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Context in which given string is embeded. This value is used to check if |
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string should be quoted as a quoted-string. 'quoted_string', the default value, |
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makes string ALWAYS quoted. 'atom' makes it quoted when string contains |
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one or more characters not included in the atext (see RFC 2822). |
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Likewise, 'token' is for token of MIME, 'http_token' is for token of HTTP, |
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'attr_char' is attribute-char of MIME (RFC 2231) and 'http_attr_char' |
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is 'http_token' AND 'attr_char' (ie. safe for both HTTP and RFC 2231). |
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=item -ebcdic_safe |
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This option is only meaningful when C<-use_quoted_string> is true. |
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See L<Message::MIME::EncodedWord>::decode. |
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=item -encode_encoded_word_like |
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This option is only meaningful when C<-use_quoted_string> is true. |
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See L<Message::MIME::EncodedWord>::decode. |
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=item -quoted_pair => 1*CHAR / qr|(:: pattern ::)| (default: qr/([\x0D\\"]|(?<==)\?)/) |
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A character list or a Regexp pattern for characters to be quoted as |
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the quoted-pairs. When '', no character is quoted. |
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Quoting is performed to characters NOT encoded as encoded-words. |
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=item -source_charset => charset (default = *internal) |
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Charset name (in lower case) of given string. |
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=item -token_maxlength |
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This option is only meaningful when C<-use_quoted_string> is true. |
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See L<Message::MIME::EncodedWord>::decode. |
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=item -unsafe_char => 1*CHAR / '' (default) |
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The list of characters that when one of them is included in the string |
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it should be quoted, in addition to special characters determined by C<-context> option. |
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=item -use_encoded_word => 0 (default)/1 |
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If true, characters in qcontent which unable to be represented in C<-charset> charset |
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are encoded in encoded-words. |
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=back |
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=cut |
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sub en_quoted_string ($;%) { |
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my ($string, %option) = @_; |
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if ($option{-use_encoded_word}) { |
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require Message::MIME::EncodedWord; |
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$option{-quoted_pair} ||= qr/([\x0D\\"]|(?<==)\?)/; |
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$string = Message::MIME::EncodedWord::encode ($string, %option, -context => 'quoted_string', -preserve_wsp => 0); |
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$option{-quoted_pair} = qr/(?!)/; |
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} |
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$string = _to_quoted_string ($string, \%option); |
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my ($s, %r) = Message::MIME::Charset::encode ($option{-charset}, $string); |
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$r{success} ? $s : $string; |
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} |
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sub _to_quoted_string ($$) { |
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my ($string, $option) = @_; |
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## -- What characters should be quoted? |
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my $achar = { |
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atom => qq(0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!#\$%&'*+/=?^_`{|}~-), |
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token => qq(0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!#\$%&'*+^_`{|}~.-), |
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http_token => qq(0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!#\$%&'*+^_`|~.-), |
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attr_char => qq(0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!#\$&+^_`{|}~.-), |
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http_attr_char => qq(0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!#\$&+^_`|~.-), |
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quoted_string => '', |
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}->{$option->{-context} || 'quoted_string'}; |
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my $echar = $option->{-unsafe_char}; $echar =~ s/([\/\\])/\\$1/g; |
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eval qq{\$achar =~ tr/$echar//d}; |
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$achar =~ s/([\\\[\]])/\\$1/g; |
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$option->{-quoted_pair} ||= qr/([\x0D"\\]|(?<==)\?)/; |
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if (!ref $option->{-quoted_pair}) { |
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$option->{-quoted_pair} = quotemeta $option->{-quoted_pair}; |
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$option->{-quoted_pair} = qr/([$option->{-quoted_pair}])/; |
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} |
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## -- Quote |
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if (length ($achar) == 0 || $string =~ /[^$achar]/) { |
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$string =~ s/$option->{-quoted_pair}/\\$1/g if $option->{-quoted_pair}; |
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$string = '"' . $string . '"'; |
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} |
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$string; |
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} |
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=head1 $string = Message::Field::Token::de_phrase ($phrase, %option) |
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Parses given phrase or a quoted-string and return it as a string (in internal code). |
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Options: |
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=over 4 |
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=item -charset => charset (default: 'us-ascii') |
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Charset name of input. The charset MUST be a superset of ASCII. |
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=item -use_encoded_word => 0/1 (default) |
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Decodes encoded-words (out of quoted-strings). |
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=item -use_quoted_encoded_word => 0 (default)/1 |
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Decodes encoded-words in quoted-strings. |
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=back |
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=cut |
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sub de_phrase ($;%) { |
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my ($string, %option) = @_; |
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$option{-use_encoded_word} = 1 unless defined $option{-use_encoded_word}; |
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require Message::MIME::EncodedWord if $option{-use_encoded_word}; |
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require Message::MIME::Charset; |
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$string =~ s("((?:\\.|[^"])*)"|([^"]+)){ ## Note: broken <"> does not match with this. |
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my ($qcontent, $atom) = ($1, $2); |
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if (defined $qcontent) { |
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if ($option{-use_quoted_encoded_word}) { |
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$qcontent = Message::MIME::EncodedWord::decode($qcontent, -process_non_encoded_word => sub { |
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$_[0] =~ s/\\(.)/$1/g; |
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my ($s, %s) = Message::MIME::Charset::decode ($option{-charset} || 'us-ascii', $_[0]); |
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$s{success} ? ($s, 0) : ($_[0], 0); |
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}); |
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} else { |
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$qcontent =~ s/\\(.)/$1/g; |
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my ($s, %s) = Message::MIME::Charset::decode ($option{-charset} || 'us-ascii', $qcontent); |
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$qcontent = $s if $s{success}; |
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} |
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$qcontent; |
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} else { ## 1*(atom / encoded-word / FWS) |
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if ($option{-use_encoded_word}) { |
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$atom = Message::MIME::EncodedWord::decode ($atom, -process_non_encoded_word => sub { |
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my ($s, %s) = Message::MIME::Charset::decode ($option{-charset} || 'us-ascii', $_[0]); |
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$s{success} ? ($s, 0) : ($_[0], 0); |
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}); |
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} |
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$atom; |
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} |
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}ges; |
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$string; |
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} |
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=head1 $string = Message::Field::Token::de_quoted_string ($quoted_string, %option) |
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An alias to C<de_phrase>. |
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=cut |
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*de_quoted_string = \&de_phrase; |
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=head1 LICENSE |
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Copyright 2002 Wakaba <[email protected]> |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; see the file COPYING. If not, write to |
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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Boston, MA 02111-1307, USA. |
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=cut |
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1; # $Date: $ |
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