snowcrawler

Terminals period semicolon word.
Nonterminals Instruction Expressions Expression.
Rootsymbol Instruction.

Instruction ->
    Expressions period : '$1'.
Instruction ->
    Expression : ['$1'].
Expressions ->
    Expression semicolon Expressions : lists:append(['$1'] , '$3').
Expressions ->
    Expression : ['$1'].
Expression ->
    word word
    : #{action => extract('$1'),
        object => extract('$2')}.

Erlang code.
extract({_, _, Value}) ->
    Value.