Interesting. Unfortunately I have never tried parser generators myself. For my
simple use cases Nim's parseutils or strscan was not that bad. Or npegs. In the
book I have an example like
import std/strscans
proc sep(input: string; start: int; seps: set[char] = {' ',',',';'}): int =
while start + result < input.len and input[start + result] in {' ','\t'}:
inc(result)
if start + result < input.len and input[start + result] in {';',','}:
inc(result)
while start + result < input.len and input[start + result] in {' ','\t'}:
inc(result)
proc stt(input: string; strVal: var string; start: int; n: int): int =
if input[start .. start + "Rect".high] == "Rect":
strVal = "Rect"
result = "Rect".len
var x1, y1, x2, y2: float
var name: string
let input = "Rect 10.0 ;20.0,100 , 200"
if scanf(input, "${stt(0)}$s$f$[sep]$f$[sep]$f$[sep]$f", name, x1, y1, x2,
y2):
echo name, ' ', x1, ' ', y1, ' ', x2, ' ', y2 # Rect 10.0 20.0 100.0 200.0
Run
Similar code I us a lot myself. Would you suggest using your parlexgen instead,
and may you be able to provide an example that does the same as above code with
your parlexgen?
