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path = absolute-path | relative-path
absolute-path = "$" [qualified-path]
qualified-path = recursive-location | relative-location
recursive-location = ".." relative-path
relative-location = "." relative-path
expression = single-quoted-string
expression =/ json-literal
expression =/ jsonpath-expression
expression =/ unary-expression / binary-expression / regex-expression / paren-expression
paren-expression = "(" expression ")"
unary-expression=unary-operator expression
binary-expression = expression binary-operator expression
regex-expression = expression regex-operator regex-literal
regex-literal = "/" regex-character-literals "/"
unary-operator = "!" / "-"
binary-operator = "*" / "/" / "%" / "+" / "-"
binary-operator =/ "&&" / "||"
binary-operator =/ <" / "<=" / "==" / ">=" / ">" / "!="
regex-operator = "=~"
function-expression = unquoted-string (
no-args /
one-or-more-args )
no-args = "(" ")"
one-or-more-args = "(" ( function-arg *( "," function-arg ) ) ")"
function-arg = expression
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