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|
##### LM #####
context undo
lex
ignore /( ' ' | '\t')+/
literal `* `( `) `^ `;
token NL /'\n'/
token id /[a-zA-Z_]+/
end
Out: parser<out>
def out_item
[id]
| [`( item* `)]
def out
[out_item*]
def item
[id]
{
send Out [r1]
}
| [`( item* `)]
{
send Out ['(']
send Out [r2]
send Out [')']
}
def A1 []
def A2 []
def start
[A1 item* `^]
| [A2 item* `; NL]
end # undo
cons Undo: undo[]
Undo.Out = construct parser<undo::out> []
parse Input: undo::start(Undo)[ stdin ]
print( Input )
##### IN #####
a b c;
##### EXP #####
a b c;
|
