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An OTP application

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routing_tree src routing_tree_parser.yrl
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src/routing_tree_parser.yrl 

Nonterminals url_path path_segment query optional_segment basic_element.



Terminals 'divider' 'binding' 'wildcard' 'optional_left' 'optional_right' 'segment' 'query_start' 'ampersand' 'equals'.



Rootsymbol url_path.





basic_element ->

    'binding': '$1'.

basic_element ->

    'segment': '$1'.



%% Optional segments can only be at the end of this

optional_segment ->

    'divider' 'optional_left' basic_element 'optional_right': [optional('$3')].

optional_segment ->

    'divider' 'optional_left' basic_element 'optional_right' query: [optional('$3')|'$5'].

optional_segment ->

    'divider' 'optional_left' basic_element 'optional_right' optional_segment: [optional('$3')|'$5'].



query ->

    'segment' 'equals' 'segment': [{'query', '$1', '$3'}].

query ->

    'segment' 'equals' 'segment' 'ampersand' query: [{'query', '$1', '$3'}|'$5'].



path_segment ->

    'query_start' query : '$2'.

path_segment ->

    'divider': [{'segment', 1, ""}].

path_segment ->

    'divider' 'wildcard': ['$2'].

path_segment ->

    optional_segment: '$1'.

path_segment ->

    'divider' basic_element: ['$2'].

path_segment ->

    'divider' basic_element path_segment: ['$2'|'$3'].



url_path ->

    path_segment: '$1'.





Erlang code.



optional(X) ->

    {optional, X}.