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