# see for example:
# - https://github.com/gvanrossum/pegen
# - https://nim-lang.org/docs/pegs.html

---input---
rule = 'a' | 'b'
rule: 'a' ~ 'b'

---tokens---
'rule'        Name.Class
' '           Text
'='           Operator
' '           Text
"'a'"         Literal.String.Single
' '           Text
'|'           Operator
' '           Text
"'b'"         Literal.String.Single
'\n'          Text.Whitespace

'rule'        Name.Class
':'           Operator
' '           Text
"'a'"         Literal.String.Single
' '           Text
'~'           Operator
' '           Text
"'b'"         Literal.String.Single
'\n'          Text.Whitespace