How can I tell pest.rs to flatten grammar?

Let's say I have a rule like,

key = { ASCII_ALPHA ~ ( ASCII_ALPHA | "_" )+ }  value = { (!NEWLINE ~ ANY)+ }  keyvalue = { key ~ "=" ~ value?  }  option = { key }  

This supports a

K=V  K=  K  

Which is want to set/unset a key, and to specify an option, what I don't like is the syntax for option which produces an AST like this,

rule: option,  span: Span {      str: "check_local_user",      start: 302,      end: 318,  },  inner: [      Pair {          rule: key,          span: Span {              str: "check_local_user",              start: 302,              end: 318,          },          inner: [],      },  ],  

I don't like that my option has inner with key. I'm just wanting to the option to have the same grammar as a key. Is there any method in Pest.rs to write the grammar such that

inner { myStuff }  outer = { inner }  

gets flattened to

outer = { myStuff }  

https://stackoverflow.com/questions/66701614/how-can-i-tell-pest-rs-to-flatten-grammar March 19, 2021 at 10:07AM