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package BibTeX;
use Symbol 'qualify_to_ref';
%bibtex_prototypes = ('string' => 'p', 'preamble' => 'v', '_' => 'kp*');
sub parse_bibtex_key ($) {
my($fh) = @_;
$_ = <$fh> while ((/^\s+$/s || /^\s+%/) && !eof $fh);
if (/^\s*([^"#%'(),={}\s]+)(.*)/s) {
$_ = $2;
lc($1);
} else {
print STDERR "no key at line $.\n";
"";
}
}
sub parse_bibtex_value ($$) {
my($fh, $strings) = @_;
my($data) = "";
my($bracelevel, $line);
# loop over concatenation
while (1) {
# loop over lines
$_ = <$fh> while ((/^\s+$/s || /^\s+%/) && !eof $fh);
s/^\s+//;
if (eof $fh) {
print STDERR "unexpected end of file\n";
return $data;
}
# check type of thing
if (/^\"(.*)/s) {
$_ = $1;
$bracelevel = 0;
$line = $.;
while (1) {
if (!$bracelevel && /^([^{}\"]*)\"(.*)/s) {
$data .= $1;
$_ = $2;
last;
} elsif ($bracelevel && /^([^{}]*\})(.*)/s) {
$data .= $1;
$_ = $2;
$bracelevel--;
} elsif (/^([^{}]*\{)(.*)/s) {
$data .= $1;
$_ = $2;
$bracelevel++;
} else {
$data .= $_;
die "end of file within quotes started at line $line" if eof $fh;
$_ = <$fh>;
}
}
} elsif (/^\{(.*)/s) {
$_ = $1;
$bracelevel = 1;
$line = $.;
while ($bracelevel) {
if (/^([^{}]*)\}(.*)/s) {
$data .= $1;
$data .= "}" if $bracelevel > 1;
$_ = $2;
$bracelevel--;
} elsif (/^([^{}]*\{)(.*)/s) {
$data .= $1;
$_ = $2;
$bracelevel++;
} else {
$data .= $_;
die "end of file within braces started at line $line" if eof $fh;
$_ = <$fh>;
}
}
} elsif (/^\#/) {
# do nothing
print STDERR "warning: odd concatenation at line $.\n";
} elsif (/^[\},]/) {
print STDERR "no data after field at line $.\n" if $data eq '';
return $data;
} elsif (/^([^\s\},]+)(.*)/s) {
if ($strings->{lc($1)}) {
$data .= $strings->{lc($1)};
} else {
$data .= $1;
}
$_ = $2;
}
# got a single string, check for concatenation
$_ = <$fh> while ((/^\s+$/s || /^\s+%/) && !eof $fh);
s/^\s+//;
if (/^\#(.*)/s) {
$_ = $1;
} else {
return $data;
}
}
}
sub parse_bibtex_entry ($$$$) {
# uses caller's $_
my($fh, $name, $strings, $entries) = @_;
my($entryline) = $.;
$_ = <$fh> while /^\s+$/ && !eof $fh;
if (/^\s*\{(.*)/s) {
$_ = $1;
} else {
print STDERR "no open brace after \@$name starting at line $entryline\n";
return [];
}
# get prototype
my($prototype) = $bibtex_prototypes{$name};
$prototype = $bibtex_prototypes{'_'} if !defined $prototype;
# parse entry into `@v'
my(@v, $a, $b);
while (!eof $fh) {
$_ = <$fh> while /^\s*$/ && !eof $fh;
if (/^\s*\}(.*)/s) {
$_ = $1;
last;
} elsif ($prototype =~ /^k/) {
push @v, parse_bibtex_key($fh);
} elsif ($prototype =~ /^v/) {
push @v, parse_bibtex_value($fh, $strings);
} elsif ($prototype =~ /^p/) {
push @v, parse_bibtex_key($fh);
$_ = <$fh> while /^\s+$/ && !eof $fh;
s/^\s+\=?//;
push @v, parse_bibtex_value($fh, $strings);
}
$_ = <$fh> while /^\s*$/ && !eof $fh;
s/^\s*,?//;
$prototype = substr($prototype, 1)
if $prototype && $prototype !~ /^.\*/;
}
print STDERR "missing args to \@$name at line $.\n"
if $prototype && $prototype !~ /^.\*/;
# do something with entry
if ($name eq 'string') {
$strings->{$v[0]} = $v[1];
} elsif ($name eq 'preamble') {
# do nothing
} else {
my($key) = shift @v;
$entries->{$key} = {@v};
$entries->{$key}->{'_type'} = $name;
$entries->{$key}->{'_key'} = $key;
push @{$entries->{'_'}}, $key;
}
}
sub parse (*;\%) {
my($fh) = qualify_to_ref(shift, caller);
my($initial_strings) = @_;
my($strings) = $initial_strings;
my($curname, $garbage, %entries);
local($_) = '';
while (<$fh>) {
if (/^\s*[%\#]/ || /^\s*$/) {
# comment
} elsif (/^\s*\@([^\s\"\#%\'(),={}]+)(.*)/s) {
$curname = lc($1);
$_ = $2;
parse_bibtex_entry($fh, $curname, $strings, \%entries);
} else {
print STDERR "garbage at line $.\n" if !defined $garbage;
$garbage = 1;
}
}
\%entries;
}
sub expand ($$) {
my($e, $key) = @_;
my(%d) = %{$e->{$key}};
while ($d{'crossref'}) {
my($v) = $d{'crossref'};
delete $d{'crossref'};
%d = (%{$e->{$v}}, %d);
}
\%d;
}
sub split_von ($$$@) {
my($f, $v, $l, @x) = @_;
my(@pre, $t, $in_von, $tt);
while (@x) {
$t = $tt = shift @x;
if ($tt =~ /^\{\\/) {
$tt =~ s/\\[A-Za-z@]+//g;
$tt =~ s/\\.//g;
$tt =~ tr/{}//d;
}
if ($tt =~ /^[a-z]/) {
push @$v, $t;
$in_von = 1;
} elsif ($in_von || !ref($f)) {
push @$l, $t, @x;
return;
} else {
push @$f, $t;
}
}
if (!$in_von) {
push @$l, (pop @$f);
}
}
sub parse_author ($) {
local($_) = $_[0];
my(@x) = ();
my($pos, $pos0, $t, $bracelevel);
$bracelevel = 0;
# move text into @x
while (!/^\s*$/) {
s/^\s+//;
$pos = 0;
while ($pos < length) {
$t = substr($_, $pos, 1);
if ($t eq '{') {
$bracelevel++;
} elsif ($t eq '}') {
$bracelevel--;
} elsif ($bracelevel <= 0) {
last if ($t =~ /[\s,]/);
}
$pos++;
}
push @x, substr($_, 0, $pos);
if ($t eq ',') {
push @x, ',';
$pos++;
}
$_ = substr($_, $pos);
}
# split @x into arrays based on `and'
my(@aa) = ([]);
foreach $t (@x) {
if ($t eq 'and') {
push @aa, [] if @{$aa[-1]} > 0;
} else {
push @{$aa[-1]}, $t;
}
}
# massage each subarray into four parts: first, von, last, jr
my(@aaa) = ();
foreach $t (@aa) {
my(@fvl, @vl, @v, @l, @f, @j, $cur, $commas);
$cur = \@fvl; $commas = 0;
# split into subarrays if possible
foreach $x (@$t) {
if ($x eq ',') {
if ($commas == 0) {
@vl = @fvl;
@fvl = ();
$cur = \@f;
} else {
push @j, @f;
@f = ();
}
$commas++;
} else {
push @$cur, $x;
}
}
# split out the `von' part
if ($commas == 0) {
split_von(\@f, \@v, \@l, @fvl);
} else {
split_von(0, \@v, \@l, @vl);
}
# store as an array of arrays
push @aaa, [[@f], [@v], [@l], [@j]];
}
@aaa;
}
1;
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