mktables

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

## !!!!!!!!!!!!!!       IF YOU MODIFY THIS FILE       !!!!!!!!!!!!!!!!!!!!!!!!!
## Any files created or read by this program should be listed in 'mktables.lst'

#!/usr/bin/perl -w
require 5.008;	# Needs pack "U". Probably safest to run on 5.8.x
use strict;
use Carp;
use File::Spec;

##
## mktables -- create the runtime Perl Unicode files (lib/unicore/**/*.pl)
## from the Unicode database files (lib/unicore/*.txt).
##

## "Fuzzy" means this section in Unicode TR18:
##
##    The recommended names for UCD properties and property values are in
##    PropertyAliases.txt [Prop] and PropertyValueAliases.txt
##    [PropValue]. There are both abbreviated names and longer, more
##    descriptive names. It is strongly recommended that both names be
##    recognized, and that loose matching of property names be used,
##    whereby the case distinctions, whitespace, hyphens, and underbar
##    are ignored.

## Base names already used in lib/gc_sc (for avoiding 8.3 conflicts)
my %BaseNames;

##
## Process any args.
##
my $Verbose        = 0;
my $MakeTestScript = 0;
my $AlwaysWrite    = 0;
my $UseDir         = "";
my $FileList       = "$0.lst";
my $MakeList       = 0;

while (@ARGV)
{
    my $arg = shift @ARGV;
    if ($arg eq '-v') {
        $Verbose = 1;
    } elsif ($arg eq '-q') {
        $Verbose = 0;
    } elsif ($arg eq '-w') {
        $AlwaysWrite = 1;	# update the files even if they havent changed
        $FileList = "";
    } elsif ($arg eq '-check') {
        my $this = shift @ARGV;
        my $ok = shift @ARGV;
        if ($this ne $ok) {
            print "Skipping as check params are not the same.\n";
            exit(0);
        }
    } elsif ($arg eq '-maketest') {
        $MakeTestScript = 1;
    } elsif ($arg eq '-makelist') {
        $MakeList = 1;        
    } elsif ($arg eq '-C' && defined ($UseDir = shift)) {
	-d $UseDir or die "Unknown directory '$UseDir'";
    } elsif ($arg eq '-L' && defined ($FileList = shift)) {
        -e $FileList or die "Filelist '$FileList' doesn't appear to exist!";
    } else {
        die "usage: $0 [-v|-q|-w|-C dir|-L filelist] [-maketest] [-makelist]\n",
            "  -v          : Verbose Mode\n",
            "  -q          : Quiet Mode\n",
            "  -w          : Write files regardless\n",
            "  -maketest   : Make test script\n",
            "  -makelist   : Rewrite the file list based on current setup\n",
            "  -L filelist : Use this file list, (defaults to $0)\n",
            "  -C dir      : Change to this directory before proceeding\n",
            "  -check A B  : Executes only if A and B are the same\n";   
    }
}

if ($FileList) {
    print "Reading file list '$FileList'\n"
        if $Verbose;
    open my $fh,"<",$FileList or die "Failed to read '$FileList':$!";
    my @input;
    my @output;
    for my $list ( \@input, \@output ) {
        while (<$fh>) {
            s/^ \s+ | \s+ $//xg;
            next if /^ \s* (?: \# .* )? $/x;
            last if /^ =+ $/x;
            my ( $file ) = split /\t/, $_;
            push @$list, $file;
        }
        my %dupe;
        @$list = grep !$dupe{ $_ }++, @$list;
    }
    close $fh;
    die "No input or output files in '$FileList'!"
        if !@input or !@output;
    if ( $MakeList ) {
        foreach my $file (@output) {
            unlink $file;
        }
    }            
    if ( $Verbose ) {
        print "Expecting ".scalar( @input )." input files. ",
              "Checking ".scalar( @output )." output files.\n";
    }
    # we set maxtime to be the youngest input file, including $0 itself.
    my $maxtime = -M $0; # do this before the chdir!
    if ($UseDir) {
        chdir $UseDir or die "Failed to chdir to '$UseDir':$!";
    }
    foreach my $in (@input) {
        my $time = -M $in;
        die "Missing input file '$in'" unless defined $time;
        $maxtime = $time if $maxtime < $time;
    }

    # now we check to see if any output files are older than maxtime, if
    # they are we need to continue on, otherwise we can presumably bail.
    my $ok = 1;
    foreach my $out (@output) {
        if ( ! -e $out ) {
            print "'$out' is missing.\n"
                if $Verbose;
            $ok = 0;
            last;
        }
        if ( -M $out > $maxtime ) {
            print "'$out' is too old.\n"
                if $Verbose;
            $ok = 0;
            last;
        }
    }
    if ($ok) {
        print "Files seem to be ok, not bothering to rebuild.\n";
        exit(0);
    }
    print "Must rebuild tables.\n"
        if $Verbose;
} else {
    if ($Verbose) {
        print "Not checking filelist.\n";
    }
    if ($UseDir) {
        chdir $UseDir or die "Failed to chdir to '$UseDir':$!";
    }
}

foreach my $lib ('To', 'lib',
		 map {File::Spec->catdir("lib",$_)}
		 qw(gc_sc dt bc hst ea jt lb nt ccc)) {
  next if -d $lib;
  mkdir $lib, 0755 or die "mkdir '$lib': $!";
}

my $LastUnicodeCodepoint = 0x10FFFF; # As of Unicode 3.1.1.

my $HEADER=<<"EOF";
# !!!!!!!   DO NOT EDIT THIS FILE   !!!!!!! 
# This file is built by $0 from e.g. UnicodeData.txt.
# Any changes made here will be lost!

EOF

sub force_unlink {
    my $filename = shift;
    return unless -e $filename;
    return if CORE::unlink($filename);
    # We might need write permission
    chmod 0777, $filename;
    CORE::unlink($filename) or die "Couldn't unlink $filename: $!\n";
}

##
## Given a filename and a reference to an array of lines,
## write the lines to the file only if the contents have not changed.
## Filename can be given as an arrayref of directory names
##
sub WriteIfChanged($\@)
{
    my $file  = shift;
    my $lines = shift;

    $file = File::Spec->catfile(@$file) if ref $file;

    my $TextToWrite = join '', @$lines;
    if (open IN, $file) {
        local($/) = undef;
        my $PreviousText = <IN>;
        close IN;
        if ($PreviousText eq $TextToWrite) {
            print "$file unchanged.\n" if $Verbose;
            return unless $AlwaysWrite;
        }
    }
    force_unlink ($file);
    if (not open OUT, ">$file") {
        die "$0: can't open $file for output: $!\n";
    }
    print "$file written.\n" if $Verbose;

    print OUT $TextToWrite;
    close OUT;
}

##
## The main datastructure (a "Table") represents a set of code points that
## are part of a particular quality (that are part of \pL, \p{InGreek},
## etc.). They are kept as ranges of code points (starting and ending of
## each range).
##
## For example, a range ASCII LETTERS would be represented as:
##   [ [ 0x41 => 0x5A, 'UPPER' ],
##     [ 0x61 => 0x7A, 'LOWER, ] ]
##
sub RANGE_START() { 0 } ## index into range element
sub RANGE_END()   { 1 } ## index into range element
sub RANGE_NAME()  { 2 } ## index into range element

## Conceptually, these should really be folded into the 'Table' objects
my %TableInfo;
my %TableDesc;
my %FuzzyNames;
my %AliasInfo;
my %CanonicalToOrig;

##
## Turn something like
##    OLD-ITALIC
## into
##    OldItalic
##
sub CanonicalName($)
{
    my $orig = shift;
    my $name = lc $orig;
    $name =~ s/(?<![a-z])(\w)/\u$1/g;
    $name =~ s/[-_\s]+//g;

    $CanonicalToOrig{$name} = $orig if not $CanonicalToOrig{$name};
    return $name;
}


##
## Store the alias definitions for later use.
##
my %PropertyAlias;
my %PropValueAlias;

my %PA_reverse;
my %PVA_reverse;

sub Build_Aliases()
{
    ##
    ## Most of the work with aliases doesn't occur here,
    ## but rather in utf8_heavy.pl, which uses PVA.pl,

    # Placate the warnings about used only once. (They are used again, but
    # via a typeglob lookup)
    %utf8::PropertyAlias = ();
    %utf8::PA_reverse = ();
    %utf8::PropValueAlias = ();
    %utf8::PVA_reverse = ();
    %utf8::PVA_abbr_map = ();

    open PA, "< PropertyAliases.txt"
	or confess "Can't open PropertyAliases.txt: $!";
    while (<PA>) {
	s/#.*//;
	s/\s+$//;
	next if /^$/;

	my ($abbrev, $name) = split /\s*;\s*/;
        next if $abbrev eq "n/a";
	$PropertyAlias{$abbrev} = $name;
        $PA_reverse{$name} = $abbrev;

	# The %utf8::... versions use japhy's code originally from utf8_pva.pl
	# However, it's moved here so that we build the tables at runtime.
	tr/ _-//d for $abbrev, $name;
	$utf8::PropertyAlias{lc $abbrev} = $name;
	$utf8::PA_reverse{lc $name} = $abbrev;
    }
    close PA;

    open PVA, "< PropValueAliases.txt"
	or confess "Can't open PropValueAliases.txt: $!";
    while (<PVA>) {
	s/#.*//;
	s/\s+$//;
	next if /^$/;

	my ($prop, @data) = split /\s*;\s*/;

	if ($prop eq 'ccc') {
	    $PropValueAlias{$prop}{$data[1]} = [ @data[0,2] ];
	    $PVA_reverse{$prop}{$data[2]} = [ @data[0,1] ];
	}
	else {
            next if $data[0] eq "n/a";
	    $PropValueAlias{$prop}{$data[0]} = $data[1];
            $PVA_reverse{$prop}{$data[1]} = $data[0];
	}

	shift @data if $prop eq 'ccc';
	next if $data[0] eq "n/a";

	$data[1] =~ tr/ _-//d;
	$utf8::PropValueAlias{$prop}{lc $data[0]} = $data[1];
	$utf8::PVA_reverse{$prop}{lc $data[1]} = $data[0];

	my $abbr_class = ($prop eq 'gc' or $prop eq 'sc') ? 'gc_sc' : $prop;
	$utf8::PVA_abbr_map{$abbr_class}{lc $data[0]} = $data[0];
    }
    close PVA;

    # backwards compatibility for L& -> LC
    $utf8::PropValueAlias{gc}{'l&'} = $utf8::PropValueAlias{gc}{lc};
    $utf8::PVA_abbr_map{gc_sc}{'l&'} = $utf8::PVA_abbr_map{gc_sc}{lc};

}


##
## Associates a property ("Greek", "Lu", "Assigned",...) with a Table.
##
## Called like:
##       New_Prop(In => 'Greek', $Table, Desc => 'Greek Block', Fuzzy => 1);
##
## Normally, these parameters are set when the Table is created (when the
## Table->New constructor is called), but there are times when it needs to
## be done after-the-fact...)
##
sub New_Prop($$$@)
{
    my $Type = shift; ## "Is" or "In";
    my $Name = shift;
    my $Table = shift;

    ## remaining args are optional key/val
    my %Args = @_;

    my $Fuzzy = delete $Args{Fuzzy};
    my $Desc  = delete $Args{Desc}; # description

    $Name = CanonicalName($Name) if $Fuzzy;

    ## sanity check a few args
    if (%Args or ($Type ne 'Is' and $Type ne 'In') or not ref $Table) {
        confess "$0: bad args to New_Prop"
    }

    if (not $TableInfo{$Type}->{$Name})
    {
        $TableInfo{$Type}->{$Name} = $Table;
        $TableDesc{$Type}->{$Name} = $Desc;
        if ($Fuzzy) {
            $FuzzyNames{$Type}->{$Name} = $Name;
        }
    }
}


##
## Creates a new Table object.
##
## Args are key/value pairs:
##    In => Name         -- Name of "In" property to be associated with
##    Is => Name         -- Name of "Is" property to be associated with
##    Fuzzy => Boolean   -- True if name can be accessed "fuzzily"
##    Desc  => String    -- Description of the property
##
## No args are required.
##
sub Table::New
{
    my $class = shift;
    my %Args = @_;

    my $Table = bless [], $class;

    my $Fuzzy = delete $Args{Fuzzy};
    my $Desc  = delete $Args{Desc};

    for my $Type ('Is', 'In')
    {
        if (my $Name = delete $Args{$Type}) {
            New_Prop($Type => $Name, $Table, Desc => $Desc, Fuzzy => $Fuzzy);
        }
    }

    ## shouldn't have any left over
    if (%Args) {
        confess "$0: bad args to Table->New"
    }

    return $Table;
}


##
## Returns the maximum code point currently in the table.
##
sub Table::Max
{
    my $last = $_[0]->[-1];      ## last code point
    confess "oops" unless $last; ## must have code points to have a max
    return $last->[RANGE_END];
}

##
## Replaces the codepoints in the Table with those in the Table given
## as an arg. (NOTE: this is not a "deep copy").
##
sub Table::Replace($$)
{
    my $Table = shift; #self
    my $New   = shift;

    @$Table = @$New;
}

##
## Given a new code point, make the last range of the Table extend to
## include the new (and all intervening) code points.
##
## Takes the time to make sure that the extension is valid.
##
sub Table::Extend
{
    my $Table = shift; #self
    my $codepoint = shift;

    my $PrevMax = $Table->Max;

    confess "oops ($codepoint <= $PrevMax)" if $codepoint <= $PrevMax;

    $Table->ExtendNoCheck($codepoint);
}


##
## Given a new code point, make the last range of the Table extend to
## include the new (and all intervening) code points.
##
## Does NOT check that the extension is valid.  Assumes that the caller
## has already made this check.