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#! /usr/bin/perl -w
#
# Static Hashtable Generator
#
# (c) 2000-2002 by Harri Porten <porten@kde.org> and
# David Faure <faure@kde.org>
$file = $ARGV[0];
shift;
my $findSize = 0;
my $includelookup = 0;
# Use -s as second argument to make it try many hash sizes
$findSize = 1 if (defined($ARGV[0]) && $ARGV[0] eq "-s");
# Use -i as second argument to make it include "lookup.h"
$includelookup = 1 if (defined($ARGV[0]) && $ARGV[0] eq "-i");
print STDERR "Creating hashtable for $file\n";
open(IN, $file) or die "No such file $file";
@keys = ();
@values = ();
@attrs = ();
@params = ();
my $inside = 0;
my $name;
my $size;
my $hashsize;
my $banner = 0;
my $namespace = "KJS";
sub calcTable();
sub output();
sub hashValue($);
while (<IN>) {
chop;
s/^\s*//g;
if (/^\#|^$/) {
# comment. do nothing
} elsif (/^\@namespace\s+(\w+)/ && !$inside) {
$namespace = $1;
} elsif (/^\@begin/ && !$inside) {
if (/^\@begin\s*([:_\w]+)\s*(\d+)\s*$/) {
$inside = 1;
$name = $1;
$hashsize = $2;
} else {
printf STDERR "WARNING: \@begin without table name and hashsize, skipping $_\n";
}
} elsif (/^\@end\s*$/ && $inside) {
if($findSize) {
my $entriesnum=@keys;
print STDERR "Table: $name $entriesnum entries\n";
for( $i=3 ; $i<79 ; ++$i) { $hashsize=$i ; calcTable(); }
} else {
calcTable();
}
output();
@keys = ();
@values = ();
@attrs = ();
@params = ();
$inside = 0;
} elsif (/^([-:\@\w\[\=\]]+)\s*([\w\:-]+)\s*([\w\|]*)\s*(\w*)\s*$/ && $inside) {
my $key = $1;
my $val = $2;
my $att = $3;
my $param = $4;
push(@keys, $key);
# values in HashEntry are short but can be unsigned in C++ code
# therefore it is necessary to force the cast in the generated files
push(@values, "(short)".$val);
printf STDERR "WARNING: Number of arguments missing for $key/$val\n"
if ( $att =~ m/Function/ && length($param) == 0);
push(@attrs, length($att) > 0 ? $att : "0");
push(@params, length($param) > 0 ? $param : "0");
} elsif ($inside) {
die "invalid data";
}
}
die "missing closing \@end" if ($inside);
sub calcTable() {
@table = ();
@links = ();
$size = $hashsize;
my $collisions = 0;
my $maxdepth = 0;
my $i = 0;
foreach $key (@keys) {
my $depth = 0;
my $h = hashValue($key) % $hashsize;
while (defined($table[$h])) {
if (defined($links[$h])) {
$h = $links[$h];
$depth++;
} else {
$collisions++;
$links[$h] = $size;
$h = $size;
$size++;
}
}
#print STDERR "table[$h] = $i\n";
$table[$h] = $i;
$i++;
$maxdepth = $depth if ( $depth > $maxdepth);
}
# Ensure table is big enough (in case of undef entries at the end)
if ( $#table+1 < $size ) {
$#table = $size-1;
}
#print STDERR "After loop: size=$size table=".($#table+1)."\n";
if ($findSize) {
my $emptycount = 0;
foreach $entry (@table) {
$emptycount++ if (!defined($entry));
}
print STDERR "Hashsize: $hashsize Total Size: $size Empty: $emptycount MaxDepth: $maxdepth Collisions: $collisions\n";
}
# my $debugtable = 0;
# foreach $entry (@table) {
# print STDERR "$debugtable " . (defined $entry ? $entry : '<undefined>');
# print STDERR " -> " . $links[$debugtable] if (defined($links[$debugtable]));
# print STDERR "\n";
# $debugtable++;
# }
}
sub hashValue($) {
@chars = split(/ */, $_[0]);
my $val = 0;
foreach $c (@chars) {
$val += ord($c);
}
return $val;
}
sub output() {
if (!$banner) {
$banner = 1;
print "/* Automatically generated from $file using $0. DO NOT EDIT ! */\n";
}
my $nameEntries = "${name}Entries";
$nameEntries =~ s/:/_/g;
my $nameStringTable = "${name}Strings";
$nameStringTable =~ y/:/_/;
print "\n#include \"lookup.h\"\n" if ($includelookup);
print "\nusing namespace KJS;\n"; # because of DontDelete etc.
print "\nnamespace $namespace {\n";
# first, build the string table
my %soffset = ();
print "\nstatic const char $nameStringTable\[\] = {\n";
my $s = "\0";
print " \"\\0\"\n";
for my $k (sort { length $b <=> length $a || $a cmp $b } @keys) {
if ($s =~ /^(.*)\Q$k\E\0/) {
$soffset{$k} = length $1;
} else {
$soffset{$k} = length $s;
print " \"$k\\0\"\n";
$s .= $k;
$s .= "\0";
}
}
print "};\n\n";
# now, dump the hash table
print "\nstatic const struct HashEntry ".$nameEntries."[] = {\n";
my $i = 0;
#print STDERR "writing out table with ".($#table+1)." entries\n";
foreach $entry (@table) {
if (defined($entry)) {
my $key = $keys[$entry];
print " \{ " . $soffset{$key};
print ", " . $values[$entry];
print ", " . $attrs[$entry];
print ", " . $params[$entry];
print ", ";
if (defined($links[$i])) {
print $links[$i] . " \}";
} else {
print "-1 \}"
}
} else {
print " \{ 0, 0, 0, 0, -1 \}";
}
print "," unless ($i == $size - 1);
print "\n";
$i++;
}
print "};\n\n";
print "const struct HashTable $name = ";
print "\{ 2, $size, ".$nameEntries.", $hashsize, ".$nameStringTable."\};\n\n";
print "} // namespace\n";
}
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