Is this an intended feature?

[bramadityaw]

I decided to ask here first before making an issue. Here is my grammar

WHITESPACE = _{ " " | "\t" }
PANAH = {"->"}
kode_sumber = {SOI ~ NEWLINE* ~ deklarasi* ~ NEWLINE* ~ EOI}
deklarasi = {(dekl_istilah) ~ NEWLINE?}
dekl_istilah = {nama ~ "=" ~ (ekspr | blok)}
ekspr = {
    ekspr_panggil
	| ekspr_lamda
    | ekspr_kalau
    | ekspr_var
	| ekspr_harf
}
ekspr_var = {nama}
ekspr_harf = {(ekspr_daftar | ekspr_bil | ekspr_var)}
ekspr_kalau = {"kalau" ~ ekspr ~ "itu"}
ekspr_daftar = {"["~ (ekspr ~ ("," ~ ekspr)* ~ ","?)? ~ "]"}
ekspr_bil = {ASCII_DIGIT+}
ekspr_lamda = {
   "("~ (nama ~ ("," ~ nama)* ~ ","?)? ~ ")" ~ 
   PANAH ~ (ekspr | blok)
}
ekspr_panggil = {nama ~ "("~ (arg ~ ("," ~ arg)* ~ ","?)? ~")"}
arg = {nama | ekspr}
nama = {ASCII_ALPHA ~ ASCII_ALPHANUMERIC*?}
blok = {NEWLINE ~ (deklarasi*) ~ ekspr}

I experimented with many inputs using the editor in the pest website. One of them is below.

a= 8n a=a()

What I expected is to be greeted with an error, but curiously, it accepted the grammar.

- kode_sumber
  - deklarasi > dekl_istilah
    - nama: "a"
    - ekspr > ekspr_harf > ekspr_bil: "8"
  - deklarasi > dekl_istilah
    - nama: "n a"
    - ekspr > ekspr_panggil > nama: "a"
  - EOI: ""

The second nama field should not have whitespace in it. Is this a bug or a mistake on my part? Thanks in advance.

[tomtau]

it's likely intended: https://pest.rs/book/grammars/syntax.html#implicit-whitespace
if you change to nama = @{ASCII_ALPHA ~ ASCII_ALPHANUMERIC*?}
it'll report this error:

 --> 1:5
  |
1 | a= 8n a=a()
  |     ^---
  |
  = expected EOI or dekl_istilah

[bramadityaw]

Thank you very much!