Re: pegs: match without guessing openarray size
Not part of the stdlib, but NPeg shoild be able to do this for you at compile
time:
import npeg
static:
let p = peg rule:
rule <- "cd" * +Space * >Alpha * ":":
echo $1
discard p.match("cd c:\blue\monkey\bike")
Run
Re: pegs: match without guessing openarray size
But sadly, it also doesn't work at compile-time.
Re: pegs: match without guessing openarray size
@sky_khan That's it! Perfect, thanks!
Re: pegs: match without guessing openarray size
To be honest, I've never used pegs in Nim before but looking at it's source, it
has MaxSubpatterns = 20. So, I guess either you can define matches as
newSeq[string](20) or you can use this,
if fixedString =~ peg"cd\s+{\D}\:":
echo matches[0]
Run
without defining matches at all, because it injects matches variable itself, if
there is none at current scope.
Re: pegs: match without guessing openarray size
This code:
import pegs
static:
var matches = newSeq[string](10)
let
fixedString = "mkdir D:\...\nimgen_test\build\libmodbus"
if fixedString.match(peg"cd\s+{\D}\:", matches): # <-- Error in this line
echo matches[0]
Run
throws /playground/nim/lib/pure/pegs.nim(1661, 13) Error: index 11 not in 0 ..
10. Notice the static statement.
Is this a bug?
Re: pegs: match without guessing openarray size
Thanks @sky_khan,
But how do I get the capture from the result? This now gives @["cd C:"], I need
it to return just the captured substring {D} ("C" in this case), like match
does.
Re: pegs: match without guessing openarray size
let
fixedString = "cd C:\\something\\sometimes\\someone"
result = fixedString.findAll(peg"cd\s+{\D}\:")
echo result
Run
