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#!/bin/sed -f
# Try of a nested tag{value} parser:
# - handles multiline tags
# - can deal with quoted \{ and \}
# - handles nested tags
# Limitations:
# - tags are not allowed to have [{}<>| ] in the name.
# - doesn't detect unbalanced brackets
#
# b{foo} -> <b>foo</b>
# b{foo em{bar}} -> <b>foo <em>bar</em></b>
# Tue Nov 27 17:28:32 UTC 2001
# \{1{2{3{4{5{6{7{8{9{a{b{c{d{e{f{g{h{i{\{text0\}}}}}}}}}}}}}}}}}}}text1\}
# How it works
# We build a stack of unclosed tags in holdspace
# by appending always at the end (``H'').
# when a closing bracket is found, fetch tag
# from holdspace.
# Main focus is small memory usage
# escape Quoted and generate entities
s,&,&,g
s,<,<,g
s,>,>,g
s,\\{,&obrace;,g
s,\\},&cbrace;,g
# uninteresting line, jump to end
/[{}]/!b unescape
:open
/{/{
s,\( *\)\([^|<>}{ ]*\){,\1\
\2\
,; # Isolate tag
# Patternspace: text \n newtag \n text
H; # append to holdspace
s,\n\([^\n]*\)\n,<\1>,; # generate XML tag
# Holdspace: ..\tagN \n text \n newtag \n text
# We only want oldtags + newtag
x
s,\(.*\n\)[^\n]*\n\([^\n]*\)\n[^\n]*$,\1\2,
x
/^[^{]*}/b close
/{/b open
}
:close
/}/{
s,},\
\
\
,
# text1 \n\n\n text2 \n\n tag0 \n tag1 text2 may be empty
G;
s,\n\n\n\([^\n]*\)\n.*\n\([^\n]*\)$,</\2>\1,
x
s,\n[^\n]*$,,; # delete tag from holdspace
x
/^[^}]*{/b open; # if next bracket is an open one
/}/b close; # another one?
}
:unescape
s,&obrace;,{,g
s,&cbrace;,},g
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