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Viewing file:     enc2xs (37.18 KB)      -rwxr-xr-x

#!/usr/bin/perl
    eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
	if $running_under_some_shell;
#!./perl
BEGIN {
    # @INC poking  no longer needed w/ new MakeMaker and Makefile.PL's
    # with $ENV{PERL_CORE} set
    # In case we need it in future...
    require Config; import Config;
}
use strict;
use warnings;
use Getopt::Std;
my @orig_ARGV = @ARGV;
our $VERSION  = do { my @r = (q$Revision: 2.1 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };

# These may get re-ordered.
# RAW is a do_now as inserted by &enter
# AGG is an aggreagated do_now, as built up by &process

use constant {
  RAW_NEXT => 0,
  RAW_IN_LEN => 1,
  RAW_OUT_BYTES => 2,
  RAW_FALLBACK => 3,

  AGG_MIN_IN => 0,
  AGG_MAX_IN => 1,
  AGG_OUT_BYTES => 2,
  AGG_NEXT => 3,
  AGG_IN_LEN => 4,
  AGG_OUT_LEN => 5,
  AGG_FALLBACK => 6,
};

# (See the algorithm in encengine.c - we're building structures for it)

# There are two sorts of structures.
# "do_now" (an array, two variants of what needs storing) is whatever we need
# to do now we've read an input byte.
# It's housed in a "do_next" (which is how we got to it), and in turn points
# to a "do_next" which contains all the "do_now"s for the next input byte.

# There will be a "do_next" which is the start state.
# For a single byte encoding it's the only "do_next" - each "do_now" points
# back to it, and each "do_now" will cause bytes. There is no state.

# For a multi-byte encoding where all characters in the input are the same
# length, then there will be a tree of "do_now"->"do_next"->"do_now"
# branching out from the start state, one step for each input byte.
# The leaf "do_now"s will all be at the same distance from the start state,
# only the leaf "do_now"s cause output bytes, and they in turn point back to
# the start state.

# For an encoding where there are varaible length input byte sequences, you
# will encounter a leaf "do_now" sooner for the shorter input sequences, but
# as before the leaves will point back to the start state.

# The system will cope with escape encodings (imagine them as a mostly
# self-contained tree for each escape state, and cross links between trees
# at the state-switching characters) but so far no input format defines these.

# The system will also cope with having output "leaves" in the middle of
# the bifurcating branches, not just at the extremities, but again no
# input format does this yet.

# There are two variants of the "do_now" structure. The first, smaller variant
# is generated by &enter as the input file is read. There is one structure
# for each input byte. Say we are mapping a single byte encoding to a
# single byte encoding, with  "ABCD" going "abcd". There will be
# 4 "do_now"s, {"A" => [...,"a",...], "B" => [...,"b",...], "C"=>..., "D"=>...}

# &process then walks the tree, building aggregate "do_now" structres for
# adjacent bytes where possible. The aggregate is for a contiguous range of
# bytes which each produce the same length of output, each move to the
# same next state, and each have the same fallback flag.
# So our 4 RAW "do_now"s above become replaced by a single structure
# containing:
# ["A", "D", "abcd", 1, ...]
# ie, for an input byte $_ in "A".."D", output 1 byte, found as
# substr ("abcd", (ord $_ - ord "A") * 1, 1)
# which maps very nicely into pointer arithmetic in C for encengine.c

sub encode_U
{
 # UTF-8 encode long hand - only covers part of perl's range
 ## my $uv = shift;
 # chr() works in native space so convert value from table
 # into that space before using chr().
 my $ch = chr(utf8::unicode_to_native($_[0]));
 # Now get core perl to encode that the way it likes.
 utf8::encode($ch);
 return $ch;
}

sub encode_S
{
 # encode single byte
 ## my ($ch,$page) = @_; return chr($ch);
 return chr $_[0];
}

sub encode_D
{
 # encode double byte MS byte first
 ## my ($ch,$page) = @_; return chr($page).chr($ch);
 return chr ($_[1]) . chr $_[0];
}

sub encode_M
{
 # encode Multi-byte - single for 0..255 otherwise double
 ## my ($ch,$page) = @_;
 ## return &encode_D if $page;
 ## return &encode_S;
 return chr ($_[1]) . chr $_[0] if $_[1];
 return chr $_[0];
}

my %encode_types = (U => \&encode_U,
                    S => \&encode_S,
                    D => \&encode_D,
                    M => \&encode_M,
                   );

# Win32 does not expand globs on command line
eval "\@ARGV = map(glob(\$_),\@ARGV)" if ($^O eq 'MSWin32');

my %opt;
# I think these are:
# -Q to disable the duplicate codepoint test
# -S make mapping errors fatal
# -q to remove comments written to output files
# -O to enable the (brute force) substring optimiser
# -o 
 to specify the output file name (else it's the first arg)
# -f  to give a file with a list of input files (else use the args)
# -n  to name the encoding (else use the basename of the input file.
getopts('CM:SQqOo:f:n:',\%opt);

$opt{M} and make_makefile_pl($opt{M}, @ARGV);
$opt{C} and make_configlocal_pm($opt{C}, @ARGV);

# This really should go first, else the die here causes empty (non-erroneous)
# output files to be written.
my @encfiles;
if (exists $opt{'f'}) {
    # -F is followed by name of file containing list of filenames
    my $flist = $opt{'f'};
    open(FLIST,$flist) 
bool(false)