#! /bin/sed -f

# html_lc.sed -- turn html tags to lowercase

# Just to be sure
s/°/°/g

# Multiple lines are handled by storing a flag in hold space
# Fool the regexps below by adding a leading < (we'll remove
# it later)
x  
/^j/ {
  x
  s/^/</
  x
}  
x  

# put ° before each tag name
s/<[ 	]*/&°/g

# put ° before each attribute name
t attr
: attr
s/\(<[^>]*[ 	]\+\)\([A-Za-z/]\+=[^> 	]\+\)/\1°\2/g
s/\(<[^>]*[ 	]\+\)\([A-Za-z/]\+="[^"]*"\)/\1°\2/g
s/\(<[^>]*[ 	]\+\)\([A-Za-z/]\+\)/\1°\2/g
t attr

# add conversion table: °° table
# table format: <to-char> <from-char>
# characters not in the table stop the conversion
s,$,°°//aaAbbBccCddDeeEffFggGhhHiiIjjJkkKllLmmMnnNooOppPqqQrrRssSttTuuUvvVwwWxxXyyYzzZ,

# substitute every char that's part of a tag or attribute and which follows a °
# also moves ° after the char
t a
: a
s/°\(.\)\(.*°°.*\)\(.\)\1/\3°\2\3\1/
t a

# cleanup...
s/°°.*//
s/°//g

# Check if the hold space flag is to be set:
# j = this line continued the previous one
# J = this line will be continued by the next one
# jJ = both things

/<[^>]*$/ {
  x
  s/$/J/
  x
}  

# If the hold space `j' flag was set, remove it, and also delete
# the leading < from pattern space
x  
/^j/ {
  x
  s/^.//
  x
  s/j//
}  

# Change the `J' flag to `j' and go on with the next line
s/J/j/
x  

### colorized by sedsed, a sed script debugger/indenter/tokenizer/HTMLizer
### original script: http://pcsiwa.rett.polimi.it/~paolob/seders/scripts/html_lc.sed