json source, makefile and readme

Former-commit-id: 16cd3ac688ba0ebd1cc5749e6aebcbe9bf90e057

json/Makefile.PL

@@ -0,0 +1,143 @@
+require 5.00503;
+use strict;
+use ExtUtils::MakeMaker;
+
+use lib qw( ./lib );
+
+$| = 1;
+
+eval q| require JSON |;
+
+# B module can't install? I'm not careful for such a problem.
+# Leave us alone today?
+if ($@) {
+    print "We try to look up lib/JSON.pm, but in vain. B module can't install?\n";
+    print "Set the environmental variable 'PERL_DL_NONLAZY' with 0.\n";
+    print "And see to ExtUtils::MM_Unix.\n";
+    print "perl says : $@";
+    print "We do not make Makefile by requiring Perl version 7.0.\n";
+    require 7.0000;
+}
+
+
+my $version     = JSON->VERSION;
+my $req_xs_ver  = JSON->require_xs_version;
+my $has_xs      = 0;
+my $xs_ver_is_ok;
+my $message;
+my $pp_only = $ENV{ PERL_ONLY } || $ENV{ NO_XS };
+
+eval q| require JSON::XS |;
+
+$has_xs = 1 unless ($@);
+
+
+if ($has_xs) {
+    my $xs_version = JSON::XS->VERSION;
+    if ($xs_version >= $req_xs_ver) {
+        $message = "You have JSON::XS (v.$xs_version), so JSON can work very fast!!";
+        $xs_ver_is_ok++;
+    }
+    else {
+        $message = "Your JSON::XS version is $xs_version, but if you install v.$req_xs_ver,\n"
+                 . "JSON will work faster.";
+    }
+}
+else {
+    $message = "If you install JSON::XS v.$req_xs_ver, it makes JSON faster.";
+}
+
+print <<EOF;
+Welcome to JSON (v.$version)
+=============================
+$message
+
+ ************************** CAUTION **************************
+ * This is 'JSON version 2' and there are many differences   *
+ * to version 1.xx                                           *
+ * Please check your applications useing old version.        *
+ *   See to 'INCOMPATIBLE CHANGES TO OLD VERSION' and 'TIPS' *
+ *************************************************************
+
+
+EOF
+
+my @prereq_pm;
+
+if ( not $pp_only and can_auto_xs_install() and not $xs_ver_is_ok ) {
+
+    my $prompt = prompt("Do you want to install JSON::XS?(Y/n)", 'Y');
+
+    if ( $prompt =~ /^[yY]/ ) {
+        @prereq_pm = ( 'JSON::XS' => $req_xs_ver );
+    }
+
+}
+
+
+WriteMakefile(
+    'NAME'          => 'JSON',
+    'VERSION_FROM'  => 'lib/JSON.pm', # finds $VERSION
+    'PREREQ_PM'     => {
+              'Test::More'  => 0,
+              @prereq_pm,
+    },
+    ($] >= 5.005 ?    ## Add these new keywords supported since 5.005
+      (ABSTRACT_FROM => 'lib/JSON.pm', # retrieve abstract from module
+       AUTHOR     => 'Makamaka Hannyaharamitu, E<lt>makamaka[at]cpan.orgE<gt>') : ()),
+    ( $ExtUtils::MakeMaker::VERSION >= 6.3002 ? ('LICENSE' => 'perl', ) : () ),
+
+    ( $ExtUtils::MakeMaker::VERSION >= 6.46 ? (
+        'META_MERGE' => {
+            resources => {
+                repository  =>      'http://github.com/makamaka/JSON',
+            },
+        } ) : ()
+    ),
+);
+
+
+if ($] < 5.006) { # I saw to http://d.hatena.ne.jp/asakusabashi/20051231/p1 
+    open(IN, "Makefile");
+    open(OUT,">Makefile.tmp") || die;
+    while(<IN>) {
+        s/PERL_DL_NONLAZY=1//g;
+        print OUT;
+    }
+    close(OUT);
+    close(IN);
+    rename("Makefile.tmp" => "Makefile");
+}
+
+
+
+
+sub can_auto_xs_install {
+    return 0 if $] < 5.008002; # JSON::XS requires
+    return 0 unless ( $ENV{PERL5_CPAN_IS_RUNNING} or $ENV{PERL5_CPANM_IS_RUNNING} ); # not cpan/cpanm running
+    return can_cc();
+}
+
+
+# copied from http://cpansearch.perl.org/src/GBARR/Scalar-List-Utils-1.23/Makefile.PL
+
+use Config;
+
+
+sub can_cc {
+
+    require File::Spec;
+
+    foreach my $cmd (split(/ /, $Config::Config{cc})) {
+        my $_cmd = $cmd;
+
+        return $_cmd if (-x $_cmd or $_cmd = MM->maybe_command($_cmd));
+
+        for my $dir ((split /$Config::Config{path_sep}/, $ENV{PATH}), '.') {
+            my $abs = File::Spec->catfile($dir, $_[1]);
+            return $abs if (-x $abs or $abs = MM->maybe_command($abs));
+        }
+    }
+
+    return;
+}