exjsonpath

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Nonterminals jsonpath path child filter_expression expression value comparison_operator.
Terminals '.' '$' '[' ']' '@' '?' '(' ')' '==' '!=' identifier integer string.
Rootsymbol jsonpath.

jsonpath -> identifier : [{access, extract_token('$1')}].
jsonpath -> identifier path : [{access, extract_token('$1')} | '$2'].
jsonpath -> '$' path : '$2'.

path -> child : '$1'.
path -> path child : '$1' ++ '$2'.

child -> '.' identifier : [{access, extract_token('$2')}].
child -> '[' integer ']' : [{access, extract_token('$2')}].
child -> '[' string ']' : [{access, extract_token('$2')}].
child -> '[' filter_expression ']' : [{access, '$2'}].

filter_expression -> '?' '(' expression ')' : '$3'.

expression -> '@' path comparison_operator value : {'$3', '$2', '$4'}.

value -> string : extract_token('$1').
value -> integer : extract_token('$1').

comparison_operator -> '==' : '=='.
comparison_operator -> '!=' : '!='.

Erlang code.

extract_token({_Token, _Line, Value}) -> Value.