1 files changed, 139 insertions, 0 deletions
diff --git a/doc/src/sgml/generate-keywords-table.pl b/doc/src/sgml/generate-keywords-table.pl
new file mode 100644
index 0000000..30037c7
--- /dev/null
+++ b/doc/src/sgml/generate-keywords-table.pl
@@ -0,0 +1,139 @@
+#!/usr/bin/perl
+#
+# Generate the keywords table for the documentation's SQL Key Words appendix
+#
+# Copyright (c) 2019-2021, PostgreSQL Global Development Group
+
+use strict;
+use warnings;
+
+my @sql_versions = reverse sort ('1992', '2011', '2016');
+
+my $srcdir = $ARGV[0];
+
+my %keywords;
+my %as_keywords;
+
+# read SQL-spec keywords
+
+foreach my $ver (@sql_versions)
+{
+	foreach my $res ('reserved', 'nonreserved')
+	{
+		foreach my $file (glob "$srcdir/keywords/sql${ver}*-${res}.txt")
+		{
+			open my $fh, '<', $file or die;
+
+			while (<$fh>)
+			{
+				chomp;
+				$keywords{$_}{$ver}{$res} = 1;
+			}
+
+			close $fh;
+		}
+	}
+}
+
+# read PostgreSQL keywords
+
+open my $fh, '<', "$srcdir/../../../src/include/parser/kwlist.h" or die;
+
+while (<$fh>)
+{
+	if (/^PG_KEYWORD\("(\w+)", \w+, (\w+)_KEYWORD\, (\w+)\)/)
+	{
+		$keywords{ uc $1 }{'pg'}{ lc $2 } = 1;
+		$as_keywords{ uc $1 } = 1 if $3 eq 'AS_LABEL';
+	}
+}
+
+close $fh;
+
+# print output
+
+print "<!-- autogenerated, do not edit -->\n";
+
+print <<END;
+<table id="keywords-table">
+ <title><acronym>SQL</acronym> Key Words</title>
+
+ <tgroup cols="5">
+  <colspec colname="col1" colwidth="5*"/>
+  <colspec colname="col2" colwidth="3*"/>
+  <colspec colname="col3" colwidth="2*"/>
+  <colspec colname="col4" colwidth="2*"/>
+  <colspec colname="col5" colwidth="2*"/>
+  <thead>
+   <row>
+    <entry>Key Word</entry>
+    <entry><productname>PostgreSQL</productname></entry>
+END
+
+foreach my $ver (@sql_versions)
+{
+	my $s = ($ver eq '1992' ? 'SQL-92' : "SQL:$ver");
+	print "    <entry>$s</entry>\n";
+}
+
+print <<END;
+   </row>
+  </thead>
+
+  <tbody>
+END
+
+foreach my $word (sort keys %keywords)
+{
+	# Insert zwsp's into very long keywords, so that they can be broken
+	# into multiple lines in PDF format (or narrow HTML windows).
+	my $printword = $word;
+	$printword =~ s/_/_&zwsp;/g if (length($printword) > 20);
+
+	print "   <row>\n";
+	print "    <entry><token>$printword</token></entry>\n";
+
+	print "    <entry>";
+	if ($keywords{$word}{pg}{'unreserved'})
+	{
+		print "non-reserved";
+	}
+	elsif ($keywords{$word}{pg}{'col_name'})
+	{
+		print "non-reserved (cannot be function or type)";
+	}
+	elsif ($keywords{$word}{pg}{'type_func_name'})
+	{
+		print "reserved (can be function or type)";
+	}
+	elsif ($keywords{$word}{pg}{'reserved'})
+	{
+		print "reserved";
+	}
+	if ($as_keywords{$word})
+	{
+		print ", requires <literal>AS</literal>";
+	}
+	print "</entry>\n";
+
+	foreach my $ver (@sql_versions)
+	{
+		print "    <entry>";
+		if ($keywords{$word}{$ver}{'reserved'})
+		{
+			print "reserved";
+		}
+		elsif ($keywords{$word}{$ver}{'nonreserved'})
+		{
+			print "non-reserved";
+		}
+		print "</entry>\n";
+	}
+	print "   </row>\n";
+}
+
+print <<END;
+  </tbody>
+ </tgroup>
+</table>
+END