#! /bin/sh -f

# Copyright (c) 2018 Thomas Wolff <towo@towo.net>

# generate a table for Unicode case conversion; entries:
# struct caseconv_entry defined in towctrans_l.c

if [ -r UnicodeData.txt ]
then	UnicodeData=UnicodeData.txt
elif [ -r /usr/share/unicode/ucd/UnicodeData.txt ]
then	UnicodeData=/usr/share/unicode/ucd/UnicodeData.txt
else	echo UnicodeData.txt not found >&2
	exit 1
fi

LC_ALL=C
export LC_ALL

compact=true

#0041;LATIN CAPITAL LETTER A;Lu;0;L;;;;;N;;;;0061;
#0061;LATIN SMALL LETTER A;Ll;0;L;;;;;N;;;0041;;0041
#0130;LATIN CAPITAL LETTER I WITH DOT ABOVE;Lu;0;L;0049 0307;;;;N;LATIN CAPITAL LETTER I DOT;;;0069;
#01C4;LATIN CAPITAL LETTER DZ WITH CARON;Lu;0;L;<compat> 0044 017D;;;;N;LATIN CAPITAL LETTER D Z HACEK;;;01C6;01C5
#01C5;LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON;Lt;0;L;<compat> 0044 017E;;;;N;LATIN LETTER CAPITAL D SMALL Z HACEK;;01C4;01C6;01C5
#01C6;LATIN SMALL LETTER DZ WITH CARON;Ll;0;L;<compat> 0064 017E;;;;N;LATIN SMALL LETTER D Z HACEK;;01C4;;01C5

tr -d '\015' < $UnicodeData |
sed \
-e 's,^\([^;]*\);[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;\([^;][^;]*\);\([^;]*\);\([^;]*\)$,src \1 upper "\2" lower "\3" title "\4",' \
-e t \
-e 's,^\([^;]*\);[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;\([^;]*\);\([^;][^;]*\);\([^;]*\)$,src \1 upper "\2" lower "\3" title "\4",' \
-e t \
-e 's,^\([^;]*\);[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;[^;]*;\([^;]*\);\([^;]*\);\([^;][^;]*\)$,src \1 upper "\2" lower "\3" title "\4",' \
-e t \
-e d |
(#src 01C5 upper "01C4" lower "01C6" title "01C5"
if $compact
then
  (
  cat <<\/EOS
  src () {
    if [ -n "$3" ]
    then	tohi=$(( 0x0$3 - 0x0$1 ))
    else	tohi=0
    fi
    if [ -n "$5" ]
    then	tolo=$(( 0x0$5 - 0x0$1 ))
    else	tolo=0
    fi
    case "$tolo.$tohi" in
    0.0)	true;;
    0.*)
	case "$1.$tohi" in
	*[02468ACE].1)	echo "'#error' U+$1 ODDSML";;
	*[02468ACE].-1)	echo "  0x$1 TO1 ODDCAP";;
	*[13579BDF].1)	echo "'#error' U+$1 EVENSML";;
	*[13579BDF].-1)	echo "  0x$1 TO1 EVENCAP";;
	*)		echo "  0x$1 TOUP $tohi";;
	esac;;
    *.0)
	case "$1.$tolo" in
	*[02468ACE].1)	echo "  0x$1 TO1 EVENCAP";;
	*[02468ACE].-1)	echo "'#error' U+$1 EVENSML";;
	*[13579BDF].1)	echo "  0x$1 TO1 ODDCAP";;
	*[13579BDF].-1)	echo "'#error' U+$1 ODDSML";;
	*)		echo "  0x$1 TOLO $tolo";;
	esac;;
    *)	case "$tolo.$tohi" in
	1.-1)		echo "  0x$1 TOBOTH 0";;
	*)		echo "'#error' U+$1";;
	esac;;
    esac
  }
/EOS
  cat
  ) | sh |
  uniq -f1 --group=append | sed -e "s,^$,range," -e t -e "s,^,item ," |
  (
  cat <<\/EOS
  first=
  diff=-1
  max=255
  range () {
	# $diff == $(($last - $first))
	if [ "$diff" -ge 0 ]
	then	# we have items at all
		echo "  {$first, $diff, $v2, $v3},"
	fi
	first=
	diff=-1
  }
  item () {
	if [ "$1" = "#error" ]
	then	echo "$*"
		return
	fi

	if [ $diff -eq $max ]
	then	range
	elif [ -n "$first" ]
	then	if [ $(( $1 )) -ne $(( ${last-0} + 1 )) ]
		then	range
		fi
	fi

	if [ -z "$first" ]
	then	first=$1
		v2=$2
		v3=$3
	fi

	last=$1
	diff=$(( $diff + 1 ))
  }
/EOS
  cat
  ) | sh
elif false
then
  sed -e 's/src \([^ ]*\) upper "\([^ ]*\)" lower "\([^ ]*\)" title "\([^ ]*\)"/  {0x\1, 0x\2 - 0x\1, 0x\3 - 0x\1},/' \
      -e 's/0x - 0x[^ ,}]*/0/g' -e 's/0x}/0}/' \
      -e 's/\(0x[0-9A-F][0-9A-F]*\) - \(0x[0-9A-F][0-9A-F]*\)/$((`printf %d \1` - `printf %d \2`))/g' \
      -e 's/^/echo "/' -e 's/$/"/' |
  sh
else
  sed -e 's/src \([^ ]*\) upper "\([^ ]*\)" lower "\([^ ]*\)" title "\([^ ]*\)"/  {0x\1, 0x\2 - 0x\1, 0x\3 - 0x\1},/' \
      -e 's/0x - 0x[^ ,}]*/0/g' -e 's/0x}/0}/'
fi
) > caseconv.t