my input is a recursive structure looks like this (notice the blank 2nd line):
xxx @{} yyy @{ zzz @{} wwww }
the grammar as i see that would read it should look like this:
start = item+
item = thing / space
thing = '@{' item* '}'
space = (!'@' .)+
but what i get is
Line 2, column 1: Expected "@{", "}", or any character but end of input found.
what am i doing wrong?
I do not know peg at all, but a quick look at the docs seems to say the dot in the 4th rule is the problem. The online parser succeeds with:
start = item+
item = thing / space
thing = '@{' item* '}'
space = [ a-z]+
This produces:
[
[
"x",
"x",
"x",
" "
],
[
"@{",
[],
"}"
],
[
" ",
"y",
"y",
"y",
" "
],
[
"@{",
[
[
" ",
"z",
"z",
"z",
" "
],
[
"@{",
[],
"}"
],
[
" ",
"w",
"w",
"w",
"w",
" "
]
],
"}"
]
]
In order to make it run, I modified the code as:
start = item+
item = thing / space
thing = '@{' item* '}'
space =[^@}]+
