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Nonterminals
record property_list property optional_semicolon value.
Terminals
key equals semicolon string comma colon mailto.
Rootsymbol record.
record -> property_list optional_semicolon : '$1'.
optional_semicolon -> semicolon : [].
optional_semicolon -> '$empty' : [].
property_list -> property : ['$1'].
property_list -> property property_list : ['$1' | '$2'].
property -> key equals value semicolon : {value('$1'), process_value(value('$1'), value_to_list('$3'))}.
property -> key equals value : {value('$1'), process_value(value('$1'), value_to_list('$3'))}.
value -> mailto : '$1'.
value -> mailto comma value : join_values('$1', '$3').
value -> string : '$1'.
value -> string colon value : join_values('$1', '$3').
Expect 1.
Erlang code.
value({_, _, Value}) -> Value.
value_to_list(Value) when is_tuple(Value) ->
[Value];
value_to_list(Values) when is_list(Values) ->
Values.
join_values(First, Rest) when is_tuple(Rest) ->
[First, Rest];
join_values(First, RestList) when is_list(RestList) ->
[First | RestList].
process_value(Key, Values) when Key =:= rua; Key =:= ruf; Key =:= fo; Key =:= rf ->
lists:map(fun value/1, Values);
process_value(_Key, [Value]) ->
value(Value);
process_value(_Key, Values) ->
[value(V) || V <- Values].
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