Comments (2)
I just took the time to look into this, and I believe that push()
is just fine. Your above grammar needs some reworking though; for example the infix
rule has two captures, but the push()
there only consumes the first using $1
.
Let me know if you still need help building your parser, if not I'll close this ticket in a few days.
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I don't understand, there's an "or" (|
) in the line you are talking about, so I thought that is just one capture performed in one of the two alternative ways?
In any case, it does work exactly like that, just without push, like:
import std/[strformat, strutils]
import npeg
let tmp = "Z1Z + A1A / B1B + -C1C"
var cap: seq[string]
let parser = peg "exp":
code <- >(?'-' * Alpha * Alnum[2..4]):
cap.add("Cod " & $1)
parenExp <- ( "(" * exp * ")" ) ^ 0
prefix <- code | parenExp
infix <- (>{'/'} * exp ^ 1) | (>{'+'} * exp ^ 2):
cap.add("Opr " & $1)
exp <- prefix * *infix
discard parser.match(tmp.replace(" ", ""))
echo cap
# As expected:
# @["Cod Z1Z", "Cod A1A", "Opr +", "Cod B1B", "Cod -C1C", "Opr +", "Opr /"]
from npeg.
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