An experimental code/text formatter that utilize Rosie Pattern Language
still just an idea
Given this json5.rpl and json5.yml
package json5
import word, num
local true = "true"
local false = "false"
local null = "null"
string = word.q
number = num.signed_number
key = word.any / string
primitive_value = string / number / true / false / null
member = key ":" primitive_value ","?
member_non_null = key ":" (string / number / true / false) ","?version: '1'
grammar: [json5.rpl]
rules:
no_comma:
scope: json5.key ":" json5.primitive ","
remove: ","
null_first:
scope: "{" json5.memeber "}"
match_and_place:
at_start: "{"
at_end: "}"
patterns:
- place: json5.key ":" json5.null ","?
before: json5.member_non_null
- match_and_place:
before_end: json5.member_non_nullthen execute
$ echo '{"a":123,"b":null}' | ufmt --grammar json5.yml --enable null_first,no_comma
{
"b": null
"a": 123
}