#

# Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

# All rights reserved.

# This component and the accompanying materials are made available

# under the terms of the License "Eclipse Public License v1.0"

# which accompanies this distribution, and is available

# at the URL "http://www.eclipse.org/legal/epl-v10.html".

#

# Initial Contributors:

# Nokia Corporation - initial contribution.

#

# Contributors:

#

# Description:

#

# UnicodeCompositionEx

# adds composition exclusion information to unicode data

#

# Added as a new field:

# Symbian:<excluded-from-composition>

# where <excluded-from-composition> is E or null.

#

# Usage:

# perl -w UnicodeAddComposeEx.pl CompositionExclusions.txt < <Unicode-data-file>

use strict;

if (scalar(@ARGV) != 1)

	{

	print (STDERR "Usage:\nperl -w UnicodeAddComposeEx.pl CompositionExclusions.txt < <Unicode-data-file>\n");

	exit 1;

	}

open(EXCLUSIONS, $ARGV[0]) or die("Could not open file $ARGV[0]\n");

my $lineNo = 0;

my %Excluded = ();

while (<EXCLUSIONS>)

	{

	$lineNo++;

	# try to parse the line if there is some non-whitespace before the comment

	if (!/^[ \t]*([#].*)?$/)

		{

		/^[ \t]*([0-9A-Fa-f]{4,6})[ \t]*([#].*)?$/ or die("Did not understand line $lineNo of $ARGV[0]");

		my $code = hex($1);

		die ("Value $code outside Unicode range at line $lineNo of $ARGV[0]")

			unless ($code < 0x110000);

		$Excluded{$code} = 1;

		#printf("Excluding %X because it is in the exclusion list\n", $code);

		}

	}

close EXCLUSIONS;

# This is a two-pass operation, so we must store the lines ready for output later.

my @DataFileLines = ();

my %DataFileLineCodes = ();

# The first pass will collect all the relevant data:

# The first character of the decomposition if there is more than one

my %FirstOfDecompositionString = ();

# The singleton decomposition if it is a singleton

my %SingletonDecomposition = ();

# The decompositions tag, if any

my %DecompTag = ();

# The combining class

my %CombiningClass = ();

# We will also be marking all singleton decompositions for exclusion

$lineNo = 0;

while (my $line = <STDIN>)

	{

	chomp $line;

	$DataFileLines[$lineNo] = $line;

	$lineNo++;

	# Split into fields: make sure trailing null strings are not

	# deleted by adding a dummy final field

	my @attribute = split(/;/, $line.';dummy');

	# Delete the dummy field

	pop @attribute;

	if (scalar(@attribute) == 15)

		{

		my $code = $attribute[0];

		die("First attribute '$code' not a valid Unicode codepoint at line $lineNo")

			unless $code =~ /^1?[0-9a-fA-F]{4,5}$/;

		$code = hex($code);

		my $combiningClass = $attribute[3];

		die("Fourth attribute '$combiningClass' is not a valid Unicode combining class at line $lineNo")

			unless (0 <= $combiningClass && $combiningClass < 256);

		my $decompositionString = $attribute[5];

		die ("Sixth attribute '$decompositionString' is not a valid decomposition string at line $lineNo")

			unless ($decompositionString =~ /^(<.*>)?[0-9a-fA-F \t]*$/);

		my @decomposition = split(/[ \t]+/, $decompositionString);

		if (@decomposition && $decomposition[0] =~ /^<.*>$/)

			{

			$DecompTag{$code} = shift @decomposition;

			}

		if (scalar(@decomposition) == 1)

			{

			# We want to exclude codes such as these, with a singleton

			# decomposition mapping, but at the moment we don't know if the

			# character mapped to has a decomposition mapping, so we will

			# defer this to another stage.

			die("Decomposition $decomposition[0] not understood at line $lineNo")

				unless ($decomposition[0] =~ /^[0-9A-Fa-f]+$/);

			$SingletonDecomposition{$code} = hex($decomposition[0]);

			}

		elsif (1 < scalar(@decomposition))

			{

			die("Decomposition $decomposition[0] not understood at line $lineNo")

				unless ($decomposition[0] =~ /^[0-9A-Fa-f]+$/);

			$FirstOfDecompositionString{$code} = hex($decomposition[0]);

			}

		$CombiningClass{$code} = $combiningClass;

		$DataFileLineCodes{$lineNo-1} = $code;

		}

	elsif ($line !~ /^[ \t]*$/)

		{

		die 'Do not understand line '.$lineNo;

		}

	}

# Each code that has a decomposition string longer than one character

# where the first character has non-zero combining class is excluded

foreach my $code (keys %FirstOfDecompositionString)

	{

	my $decomp = $FirstOfDecompositionString{$code};

	if (exists($CombiningClass{$decomp}))

		{

		if ($CombiningClass{$decomp} != 0)

			{

			$Excluded{$code} = 1;

			#printf("Excluding %X because its decomposition starts with a non-starter(%X)\n", $code, $decomp);

			}

		}

	}

# Each code that has a singleton decomposition string may be excluded if

# that code has only a singleton mapping itself.

foreach my $code (sort (keys %SingletonDecomposition))

	{

	my $mapsTo = $code;

	while (exists $SingletonDecomposition{$mapsTo} && !exists $DecompTag{$code})

		{

		$mapsTo = $SingletonDecomposition{$mapsTo};

		}

	if (!exists $FirstOfDecompositionString{$mapsTo})

		{

		#printf("Excluding %X because its decomposition is a singleton(%X)\n", $code, $mapsTo);

		$Excluded{$code} = 1;

		}

	}

# Now we output the file with the extra filed appended to each line

for(my $i = 0; $i != scalar(@DataFileLines); $i++)

	{

	print $DataFileLines[$i];

	if (exists($DataFileLineCodes{$i}))

		{

		print ';Symbian:';

		if (exists($Excluded{ $DataFileLineCodes{$i} }))

			{

			print 'E';

			}

		}

	print "\n";

	}