test/backtrack1.lm


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

# Token names.

lex start
{
	literal '+', '*'
	token number /[0-9]+/
	ignore ws / [ \t\n]+ /
}

def F
	[number '+']
|	[number]
|	[F '*' number]

def E
	[E '+' F]
|	[F]

def start 
	[E]

parse SP: start[ stdin ]
S: start = SP.tree
R: start = match S ~ 9 + 9
print_xml( R )