// newlines are not whitespace because each line is an independent meaningful thing.
WHITESPACE = _{ " " | "\t" }
rule_start = { "rule" }
rule_name = { ASCII_ALPHANUMERIC+ }
rule_declaration = @{ rule_start ~ " " ~ rule_name }
value = @{ (!NEWLINE ~ ANY)+ }
key = { ASCII_ALPHANUMERIC+ }
rule_assignment = { key ~ "=" ~ value ~ (NEWLINE | EOI) }
rule = { rule_declaration ~ NEWLINE ~ rule_assignment+ }
program = { rule+ }