# Time-stamp: "2001-06-21 23:09:33 MDT"
require 5;
package Locale::Maketext;
use strict;
use vars qw( @ISA $VERSION $MATCH_SUPERS $USING_LANGUAGE_TAGS
$USE_LITERALS);
use Carp ();
use I18N::LangTags 0.21 ();
#--------------------------------------------------------------------------
BEGIN { unless(defined &DEBUG) { *DEBUG = sub () {0} } }
# define the constant 'DEBUG' at compile-time
$VERSION = "1.03";
@ISA = ();
$MATCH_SUPERS = 1;
$USING_LANGUAGE_TAGS = 1;
# Turning this off is somewhat of a security risk in that little or no
# checking will be done on the legality of tokens passed to the
# eval("use $module_name") in _try_use. If you turn this off, you have
# to do your own taint checking.
$USE_LITERALS = 1 unless defined $USE_LITERALS;
# a hint for compiling bracket-notation things.
my %isa_scan = ();
###########################################################################
sub quant {
my($handle, $num, @forms) = @_;
return $num if @forms == 0; # what should this mean?
return $forms[2] if @forms > 2 and $num == 0; # special zeroth case
# Normal case:
# Note that the formatting of $num is preserved.
return( $handle->numf($num) . ' ' . $handle->numerate($num, @forms) );
# Most human languages put the number phrase before the qualified phrase.
}
sub numerate {
# return this lexical item in a form appropriate to this number
my($handle, $num, @forms) = @_;
my $s = ($num == 1);
return '' unless @forms;
if(@forms == 1) { # only the headword form specified
return $s ? $forms[0] : ($forms[0] . 's'); # very cheap hack.
} else { # sing and plural were specified
return $s ? $forms[0] : $forms[1];
}
}
#--------------------------------------------------------------------------
sub numf {
my($handle, $num) = @_[0,1];
if($num < 10_000_000_000 and $num > -10_000_000_000 and $num == int($num)) {
$num += 0; # Just use normal integer stringification.
# Specifically, don't let %G turn ten million into 1E+007
} else {
$num = CORE::sprintf("%G", $num);
# "CORE::" is there to avoid confusion with the above sub sprintf.
}
while( $num =~ s/^([-+]?\d+)(\d{3})/$1,$2/s ) {1} # right from perlfaq5
# The initial \d+ gobbles as many digits as it can, and then we
# backtrack so it un-eats the rightmost three, and then we
# insert the comma there.
$num =~ tr<.,><,.> if ref($handle) and $handle->{'numf_comma'};
# This is just a lame hack instead of using Number::Format
return $num;
}
sub sprintf {
no integer;
my($handle, $format, @params) = @_;
return CORE::sprintf($format, @params);
# "CORE::" is there to avoid confusion with myself!
}
#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#=#
use integer; # vroom vroom... applies to the whole rest of the module
sub language_tag {
my $it = ref($_[0]) || $_[0];
return undef unless $it =~ m/([^':]+)(?:::)?$/s;
$it = lc($1);
$it =~ tr<_><->;
return $it;
}
sub encoding {
my $it = $_[0];
return(
(ref($it) && $it->{'encoding'})
|| "iso-8859-1" # Latin-1
);
}
#--------------------------------------------------------------------------
sub fallback_languages { return('i-default', 'en', 'en-US') }
sub fallback_language_classes { return () }
#--------------------------------------------------------------------------
sub fail_with { # an actual attribute method!
my($handle, @params) = @_;
return unless ref($handle);
$handle->{'fail'} = $params[0] if @params;
return $handle->{'fail'};
}
#--------------------------------------------------------------------------
sub failure_handler_auto {
# Meant to be used like:
# $handle->fail_with('failure_handler_auto')
my($handle, $phrase, @params) = @_;
$handle->{'failure_lex'} ||= {};
my $lex = $handle->{'failure_lex'};
my $value;
$lex->{$phrase} ||= ($value = $handle->_compile($phrase));
# Dumbly copied from sub maketext:
{
local $SIG{'__DIE__'};
eval { $value = &$value($handle, @_) };
}
# If we make it here, there was an exception thrown in the
# call to $value, and so scream:
if($@) {
my $err = $@;
# pretty up the error message
$err =~ s<\s+at\s+\(eval\s+\d+\)\s+line\s+(\d+)\.?\n?>
<\n in bracket code [compiled line $1],>s;
#$err =~ s/\n?$/\n/s;
Carp::croak "Error in maketexting \"$phrase\":\n$err as used";
# Rather unexpected, but suppose that the sub tried calling
# a method that didn't exist.
} else {
return $value;
}
}
#==========================================================================
sub new {
# Nothing fancy!
my $class = ref($_[0]) || $_[0];
my $handle = bless {}, $class;
$handle->init;
return $handle;
}
sub init { return } # no-op
###########################################################################
sub maketext {
# Remember, this can fail. Failure is controllable many ways.
Carp::croak "maketext requires at least one parameter" unless @_ > 1;
my($handle, $phrase) = splice(@_,0,2);
# Look up the value:
my $value;
foreach my $h_r (
@{ $isa_scan{ref($handle) || $handle} || $handle->_lex_refs }
) {
print "* Looking up \"$phrase\" in $h_r\n" if DEBUG;
if(exists $h_r->{$phrase}) {
print " Found \"$phrase\" in $h_r\n" if DEBUG;
unless(ref($value = $h_r->{$phrase})) {
# Nonref means it's not yet compiled. Compile and replace.
$value = $h_r->{$phrase} = $handle->_compile($value);
}
last;
} elsif($phrase !~ m/^_/s and $h_r->{'_AUTO'}) {
# it's an auto lex, and this is an autoable key!
print " Automaking \"$phrase\" into $h_r\n" if DEBUG;
$value = $h_r->{$phrase} = $handle->_compile($phrase);
last;
}
print " Not found in $h_r, nor automakable\n" if DEBUG > 1;
# else keep looking
}
unless(defined($value)) {
print "! Lookup of \"$phrase\" in/under ", ref($handle) || $handle,
" fails.\n" if DEBUG;
if(ref($handle) and $handle->{'fail'}) {
print "WARNING0: maketext fails looking for <$phrase>\n" if DEBUG;
my $fail;
if(ref($fail = $handle->{'fail'}) eq 'CODE') { # it's a sub reference
return &{$fail}($handle, $phrase, @_);
# If it ever returns, it should return a good value.
} else { # It's a method name
return $handle->$fail($phrase, @_);
# If it ever returns, it should return a good value.
}
} else {
# All we know how to do is this;
Carp::croak("maketext doesn't know how to say:\n$phrase\nas needed");
}
}
return $$value if ref($value) eq 'SCALAR';
return $value unless ref($value) eq 'CODE';
{
local $SIG{'__DIE__'};
eval { $value = &$value($handle, @_) };
}
# If we make it here, there was an exception thrown in the
# call to $value, and so scream:
if($@) {
my $err = $@;
# pretty up the error message
$err =~ s<\s+at\s+\(eval\s+\d+\)\s+line\s+(\d+)\.?\n?>
<\n in bracket code [compiled line $1],>s;
#$err =~ s/\n?$/\n/s;
Carp::croak "Error in maketexting \"$phrase\":\n$err as used";
# Rather unexpected, but suppose that the sub tried calling
# a method that didn't exist.
} else {
return $value;
}
}
###########################################################################
sub get_handle { # This is a constructor and, yes, it CAN FAIL.
# Its class argument has to be the base class for the current
# application's l10n files.
my($base_class, @languages) = @_;
$base_class = ref($base_class) || $base_class;
# Complain if they use __PACKAGE__ as a project base class?
unless(@languages) { # Calling with no args is magical! wooo, magic!
if(length( $ENV{'REQUEST_METHOD'} || '' )) { # I'm a CGI
my $in = $ENV{'HTTP_ACCEPT_LANGUAGE'} || '';
# supposedly that works under mod_perl, too.
$in =~ s<\([\)]*\)><>g; # Kill parens'd things -- just a hack.
@languages = &I18N::LangTags::extract_language_tags($in) if length $in;
# ...which untaints, incidentally.
} else { # Not running as a CGI: try to puzzle out from the environment
if(length( $ENV{'LANG'} || '' )) {
push @languages, split m/[,:]/, $ENV{'LANG'};
# LANG can be only /one/ locale as far as I know, but what the hey.
}
if(length( $ENV{'LANGUAGE'} || '' )) {
push @languages, split m/[,:]/, $ENV{'LANGUAGE'};
}
print "Noting ENV LANG ", join(',', @languages),"\n" if DEBUG;
# Those are really locale IDs, but they get xlated a few lines down.
if(&_try_use('Win32::Locale')) {
# If we have that module installed...
push @languages, Win32::Locale::get_language()
if defined &Win32::Locale::get_language;
}
}
}
#------------------------------------------------------------------------
print "Lgs1: ", map("<$_>", @languages), "\n" if DEBUG;
if($USING_LANGUAGE_TAGS) {
@languages = map &I18N::LangTags::locale2language_tag($_), @languages;
# if it's a lg tag, fine, pass thru (untainted)
# if it's a locale ID, try converting to a lg tag (untainted),
# otherwise nix it.
push @languages, map I18N::LangTags::super_languages($_), @languages
if $MATCH_SUPERS;
@languages = map { $_, I18N::LangTags::alternate_language_tags($_) }
@languages; # catch alternation
push @languages, I18N::LangTags::panic_languages(@languages)
if defined &I18N::LangTags::panic_languages;
push @languages, $base_class->fallback_languages;
# You are free to override fallback_languages to return empty-list!
@languages = # final bit of processing:
map {
my $it = $_; # copy
$it =~ tr<-A-Z><_a-z>; # lc, and turn - to _
$it =~ tr<_a-z0-9><>cd; # remove all but a-z0-9_
$it;
} @languages
;
}
print "Lgs2: ", map("<$_>", @languages), "\n" if DEBUG > 1;
push @languages, $base_class->fallback_language_classes;
# You are free to override that to return whatever.
my %seen = ();
foreach my $module_name ( map { $base_class . "::" . $_ } @languages )
{
next unless length $module_name; # sanity
next if $seen{$module_name}++ # Already been here, and it was no-go
|| !&_try_use($module_name); # Try to use() it, but can't it.
return($module_name->new); # Make it!
}
return undef; # Fail!
}
###########################################################################
#
# This is where most people should stop reading.
#
###########################################################################
sub _compile {
# This big scarp routine compiles an entry.
# It returns either a coderef if there's brackety bits in this, or
# otherwise a ref to a scalar.
my $target = ref($_[0]) || $_[0];
my(@code);
my(@c) = (''); # "chunks" -- scratch.
my $call_count = 0;
my $big_pile = '';
{
my $in_group = 0; # start out outside a group
my($m, @params); # scratch
while($_[1] =~ # Iterate over chunks.
m<\G(
[^\~\[\]]+ # non-~[] stuff
|
~. # ~[, ~], ~~, ~other
|
\[ # [ presumably opening a group
|
\] # ] presumably closing a group
|
~ # terminal ~ ?
|
$
)>xgs
) {
print " \"$1\"\n" if DEBUG > 2;
if($1 eq '[' or $1 eq '') { # "[" or end
# Whether this is "[" or end, force processing of any
# preceding literal.
if($in_group) {
if($1 eq '') {
$target->_die_pointing($_[1], "Unterminated bracket group");
} else {
$target->_die_pointing($_[1], "You can't nest bracket groups");
}
} else {
if($1 eq '') {
print " [end-string]\n" if DEBUG > 2;
} else {
$in_group = 1;
}
die "How come \@c is empty?? in <$_[1]>" unless @c; # sanity
if(length $c[-1]) {
# Now actually processing the preceding literal
$big_pile .= $c[-1];
if($USE_LITERALS and (
(ord('A') == 65)
? $c[-1] !~ m<[^\x20-\x7E]>s
# ASCII very safe chars
: $c[-1] !~ m/[^ !"\#\$%&'()*+,\-.\/0-9:;<=>?\@A-Z[\\\]^_`a-z{|}~\x07]/s
# EBCDIC very safe chars
)) {
# normal case -- all very safe chars
$c[-1] =~ s/'/\\'/g;
push @code, q{ '} . $c[-1] . "',\n";
$c[-1] = ''; # reuse this slot
} else {
push @code, ' $c[' . $#c . "],\n";
push @c, ''; # new chunk
}
}
# else just ignore the empty string.
}
} elsif($1 eq ']') { # "]"
# close group -- go back in-band
if($in_group) {
$in_group = 0;
print " --Closing group [$c[-1]]\n" if DEBUG > 2;
# And now process the group...
if(!length($c[-1]) or $c[-1] =~ m/^\s+$/s) {
DEBUG > 2 and print " -- (Ignoring)\n";
$c[-1] = ''; # reset out chink
next;
}
#$c[-1] =~ s/^\s+//s;
#$c[-1] =~ s/\s+$//s;
($m,@params) = split(",", $c[-1], -1); # was /\s*,\s*/
# A bit of a hack -- we've turned "~,"'s into DELs, so turn
# 'em into real commas here.
if (ord('A') == 65) { # ASCII, etc
foreach($m, @params) { tr/\x7F/,/ }
} else { # EBCDIC (1047, 0037, POSIX-BC)
# Thanks to Peter Prymmer for the EBCDIC handling
foreach($m, @params) { tr/\x07/,/ }
}
# Special-case handling of some method names:
if($m eq '_*' or $m =~ m<^_(-?\d+)$>s) {
# Treat [_1,...] as [,_1,...], etc.
unshift @params, $m;
$m = '';
} elsif($m eq '*') {
$m = 'quant'; # "*" for "times": "4 cars" is 4 times "cars"
} elsif($m eq '#') {
$m = 'numf'; # "#" for "number": [#,_1] for "the number _1"
}
# Most common case: a simple, legal-looking method name
if($m eq '') {
# 0-length method name means to just interpolate:
push @code, ' (';
} elsif($m =~ m<^\w+(?:\:\:\w+)*$>s
and $m !~ m<(?:^|\:)\d>s
# exclude starting a (sub)package or symbol with a digit
) {
# Yes, it even supports the demented (and undocumented?)
# $obj->Foo::bar(...) syntax.
$target->_die_pointing(
$_[1], "Can't (yet?) use \"SUPER::\" in a bracket-group method",
2 + length($c[-1])
)
if $m =~ m/^SUPER::/s;
# Because for SUPER:: to work, we'd have to compile this into
# the right package, and that seems just not worth the bother,
# unless someone convinces me otherwise.
push @code, ' $_[0]->' . $m . '(';
} else {
# TODO: implement something? or just too icky to consider?
$target->_die_pointing(
$_[1],
"Can't use \"$m\" as a method name in bracket group",
2 + length($c[-1])
);
}
pop @c; # we don't need that chunk anymore
++$call_count;
foreach my $p (@params) {
if($p eq '_*') {
# Meaning: all parameters except $_[0]
$code[-1] .= ' @_[1 .. $#_], ';
# and yes, that does the right thing for all @_ < 3
} elsif($p =~ m<^_(-?\d+)$>s) {
# _3 meaning $_[3]
$code[-1] .= '$_[' . (0 + $1) . '], ';
} elsif($USE_LITERALS and (
(ord('A') == 65)
? $p !~ m<[^\x20-\x7E]>s
# ASCII very safe chars
: $p !~ m/[^ !"\#\$%&'()*+,\-.\/0-9:;<=>?\@A-Z[\\\]^_`a-z{|}~\x07]/s
# EBCDIC very safe chars
)) {
# Normal case: a literal containing only safe characters
$p =~ s/'/\\'/g;
$code[-1] .= q{'} . $p . q{', };
} else {
# Stow it on the chunk-stack, and just refer to that.
push @c, $p;
push @code, ' $c[' . $#c . "], ";
}
}
$code[-1] .= "),\n";
push @c, '';
} else {
$target->_die_pointing($_[1], "Unbalanced ']'");
}
} elsif(substr($1,0,1) ne '~') {
# it's stuff not containing "~" or "[" or "]"
# i.e., a literal blob
$c[-1] .= $1;
} elsif($1 eq '~~') { # "~~"
$c[-1] .= '~';
} elsif($1 eq '~[') { # "~["
$c[-1] .= '[';
} elsif($1 eq '~]') { # "~]"
$c[-1] .= ']';
} elsif($1 eq '~,') { # "~,"
if($in_group) {
# This is a hack, based on the assumption that no-one will actually
# want a DEL inside a bracket group. Let's hope that's it's true.
if (ord('A') == 65) { # ASCII etc
$c[-1] .= "\x7F";
} else { # EBCDIC (cp 1047, 0037, POSIX-BC)
$c[-1] .= "\x07";
}
} else {
$c[-1] .= '~,';
}
} elsif($1 eq '~') { # possible only at string-end, it seems.
$c[-1] .= '~';
} else {
# It's a "~X" where X is not a special character.
# Consider it a literal ~ and X.
$c[-1] .= $1;
}
}
}
if($call_count) {
undef $big_pile; # Well, nevermind that.
} else {
# It's all literals! Ahwell, that can happen.
# So don't bother with the eval. Return a SCALAR reference.
return \$big_pile;
}
die "Last chunk isn't null??" if @c and length $c[-1]; # sanity
print scalar(@c), " chunks under closure\n" if DEBUG;
if(@code == 0) { # not possible?
print "Empty code\n" if DEBUG;
return \'';
} elsif(@code > 1) { # most cases, presumably!
unshift @code, "join '',\n";
}
unshift @code, "use strict; sub {\n";
push @code, "}\n";
print @code if DEBUG;
my $sub = eval(join '', @code);
die "$@ while evalling" . join('', @code) if $@; # Should be impossible.
return $sub;
}
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
sub _die_pointing {
# This is used by _compile to throw a fatal error
my $target = shift; # class name
# ...leaving $_[0] the error-causing text, and $_[1] the error message
my $i = index($_[0], "\n");
my $pointy;
my $pos = pos($_[0]) - (defined($_[2]) ? $_[2] : 0) - 1;
if($pos < 1) {
$pointy = "^=== near there\n";
} else { # we need to space over
my $first_tab = index($_[0], "\t");
if($pos > 2 and ( -1 == $first_tab or $first_tab > pos($_[0]))) {
# No tabs, or the first tab is harmlessly after where we will point to,
# AND we're far enough from the margin that we can draw a proper arrow.
$pointy = ('=' x $pos) . "^ near there\n";
} else {
# tabs screw everything up!
$pointy = substr($_[0],0,$pos);
$pointy =~ tr/\t //cd;
# make everything into whitespace, but preseving tabs
$pointy .= "^=== near there\n";
}
}
my $errmsg = "$_[1], in\:\n$_[0]";
if($i == -1) {
# No newline.
$errmsg .= "\n" . $pointy;
} elsif($i == (length($_[0]) - 1) ) {
# Already has a newline at end.
$errmsg .= $pointy;
} else {
# don't bother with the pointy bit, I guess.
}
Carp::croak( "$errmsg via $target, as used" );
}
###########################################################################
my %tried = ();
# memoization of whether we've used this module, or found it unusable.
sub _try_use { # Basically a wrapper around "require Modulename"
# "Many men have tried..." "They tried and failed?" "They tried and died."
return $tried{$_[0]} if exists $tried{$_[0]}; # memoization
my $module = $_[0]; # ASSUME sane module name!
{ no strict 'refs';
return($tried{$module} = 1)
if defined(%{$module . "::Lexicon"}) or defined(@{$module . "::ISA"});
# weird case: we never use'd it, but there it is!
}
print " About to use $module ...\n" if DEBUG;
{
local $SIG{'__DIE__'};
eval "require $module"; # used to be "use $module", but no point in that.
}
if($@) {
print "Error using $module \: $@\n" if DEBUG > 1;
return $tried{$module} = 0;
} else {
print " OK, $module is used\n" if DEBUG;
return $tried{$module} = 1;
}
}
#--------------------------------------------------------------------------
sub _lex_refs { # report the lexicon references for this handle's class
# returns an arrayREF!
no strict 'refs';
my $class = ref($_[0]) || $_[0];
print "Lex refs lookup on $class\n" if DEBUG > 1;
return $isa_scan{$class} if exists $isa_scan{$class}; # memoization!
my @lex_refs;
my $seen_r = ref($_[1]) ? $_[1] : {};
if( defined( *{$class . '::Lexicon'}{'HASH'} )) {
push @lex_refs, *{$class . '::Lexicon'}{'HASH'};
print "%" . $class . "::Lexicon contains ",
scalar(keys %{$class . '::Lexicon'}), " entries\n" if DEBUG;
}
# Implements depth(height?)-first recursive searching of superclasses.
# In hindsight, I suppose I could have just used Class::ISA!
foreach my $superclass (@{$class . "::ISA"}) {
print " Super-class search into $superclass\n" if DEBUG;
next if $seen_r->{$superclass}++;
push @lex_refs, @{&_lex_refs($superclass, $seen_r)}; # call myself
}
$isa_scan{$class} = \@lex_refs; # save for next time
return \@lex_refs;
}
sub clear_isa_scan { %isa_scan = (); return; } # end on a note of simplicity!
###########################################################################
1;
|
