add routine to calculate Code 39 mod 43 barcode checkdigits

[migration-tools.git] / sql / base / base.sql

diff --git a/sql/base/base.sql b/sql/base/base.sql
index f0b5654..916686a 100644 (file)
--- a/sql/base/base.sql
+++ b/sql/base/base.sql
@@ -365,9 +365,9 @@ CREATE OR REPLACE FUNCTION migration_tools.address_parse_out_citystatezip (TEXT)
             state := REGEXP_REPLACE( city_state_zip, E'^(.*),(.*)$', E'\\2');
             city := REGEXP_REPLACE( city_state_zip, E'^(.*),(.*)$', E'\\1');
         ELSE
-            IF city_state_zip ~ E'\\s+[A-Z][A-Z]\\s*' THEN
-                state := REGEXP_REPLACE( city_state_zip, E'^.*,?\\s+([A-Z][A-Z])\\s*.*$', E'\\1' );
-                city := REGEXP_REPLACE( city_state_zip, E'^(.*?),?\\s+[A-Z][A-Z](\\s*.*)$', E'\\1\\2' );
+            IF city_state_zip ~ E'\\s+[A-Z][A-Z]\\s*$' THEN
+                state := REGEXP_REPLACE( city_state_zip, E'^.*,?\\s+([A-Z][A-Z])\\s*$', E'\\1' );
+                city := REGEXP_REPLACE( city_state_zip, E'^(.*?),?\\s+[A-Z][A-Z](\\s*)$', E'\\1\\2' );
             ELSE
                 IF city_state_zip ~ E'^\\S+$'  THEN
                     city := city_state_zip;
@@ -624,25 +624,18 @@ CREATE OR REPLACE FUNCTION migration_tools.expand_barcode (TEXT, TEXT, INTEGER,
     return "$prefix$new_barcode$suffix";
 $$ LANGUAGE PLPERLU STABLE;
 
-CREATE OR REPLACE FUNCTION migration_tools.attempt_cast (TEXT,TEXT,TEXT) RETURNS RECORD AS $$
+-- remove previous version of this function
+DROP FUNCTION IF EXISTS migration_tools.attempt_cast(TEXT, TEXT, TEXT);
+
+CREATE OR REPLACE FUNCTION migration_tools.attempt_cast (TEXT, TEXT) RETURNS TEXT AS $$
     DECLARE
         attempt_value ALIAS FOR $1;
         datatype ALIAS FOR $2;
-        fail_value ALIAS FOR $3;
-        output RECORD;
     BEGIN
-        FOR output IN
-            EXECUTE 'SELECT ' || quote_literal(attempt_value) || '::' || datatype || ' AS a;'
-        LOOP
-            RETURN output;
-        END LOOP;
+        EXECUTE 'SELECT ' || quote_literal(attempt_value) || '::' || datatype || ' AS a;';
+        RETURN attempt_value;
     EXCEPTION
-        WHEN OTHERS THEN
-            FOR output IN
-                EXECUTE 'SELECT ' || quote_literal(fail_value) || '::' || datatype || ' AS a;'
-            LOOP
-                RETURN output;
-            END LOOP;
+        WHEN OTHERS THEN RETURN NULL;
     END;
 $$ LANGUAGE PLPGSQL STRICT STABLE;
 
@@ -731,6 +724,31 @@ CREATE OR REPLACE FUNCTION migration_tools.add_codabar_checkdigit (TEXT) RETURNS
     return $barcode . $checkdigit; 
 $$ LANGUAGE PLPERLU STRICT STABLE;
 
+-- add_code39mod43_checkdigit
+--   $barcode      source barcode
+--
+-- If the source string is 13 or 14 characters long and contains only valid
+-- Code 39 mod 43 characters, adds or replaces the 14th
+-- character with a checkdigit computed according to the usual algorithm for library barcodes
+-- using the Code 39 mod 43 symbology - see <http://en.wikipedia.org/wiki/Code_39#Code_39_mod_43>.  If the
+-- input string does not meet those requirements, it is returned unchanged.
+--
+CREATE OR REPLACE FUNCTION migration_tools.add_code39mod43_checkdigit (TEXT) RETURNS TEXT AS $$
+    my $barcode = shift;
+
+    return $barcode if $barcode !~ /^[0-9A-Z. $\/+%-]{13,14}$/;
+    $barcode = substr($barcode, 0, 13); # ignore 14th character
+
+    my @valid_chars = split //, '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%';
+    my %nums = map { $valid_chars[$_] => $_ } (0..42);
+
+    my $total = 0;
+    $total += $nums{$_} foreach split(//, $barcode);
+    my $remainder = $total % 43;
+    my $checkdigit = $valid_chars[$remainder];
+    return $barcode . $checkdigit;
+$$ LANGUAGE PLPERLU STRICT STABLE;
+
 CREATE OR REPLACE FUNCTION migration_tools.attempt_phone (TEXT,TEXT) RETURNS TEXT AS $$
   DECLARE
     phone TEXT := $1;