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##### LM #####
# Token names.
lex
token id /[a-z]+/
ignore ws /[ \t\n]+/
end
token bang1 /'!'/
token bang2 /'!'/
def one [bang1 id id id]
def two [bang2 id id id id]
def prods
[one]
| [two]
def start
[prods]
parse S: start[ stdin ]
print_xml( match S "!aa bb cc dd" )
print( '\n' )
##### IN #####
!aa bb cc dd
##### EXP #####
<start><prods><two><bang2>!</bang2><id>aa</id><id>bb</id><id>cc</id><id>dd</id></two></prods></start>
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