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## Grammar
The grammar is specified using ABNF, as described in RFC4234
```
json-path = root-selector / selector_rhs
root-selector = "$"
selector = sub-selector / index-selector / identifier
selector =/ "*" / union_expression
selector =/ function-expression
selector_rhs = "." ( selector / index-selector / identifier / "*" )
selector_rhs =/ union_selector
index-selector = selector bracket-specifier / bracket-specifier
union = "[" ( selector *( "," selector ) ) "]"
bracket-specifier = "[" (number / "*" / slice-selector) "]" / "[]"
bracket-specifier =/ "[?" selector "]"
slice-selector = [number] ":" [number] [ ":" [number] ]
function-selector = unquoted-string (
no-args /
one-or-more-args )
no-args = "(" ")"
one-or-more-args = "(" ( function-arg *( "," function-arg ) ) ")"
function-arg = selector
current-node = "@"
preserved-escape = escape (%x20-26 / %28-5B / %x5D-10FFFF)
raw-string-escape = escape ("'" / escape)
literal = "`" json-value "`"
unescaped-literal = %x20-21 / ; space !
%x23-5B / ; # - [
%x5D-5F / ; ] ^ _
%x61-7A ; a-z
%x7C-10FFFF ; |}~ ...
escaped-literal = escaped-char / (escape %x60)
number = ["-"]1*digit
digit = %x30-39
identifier = unquoted-string / quoted-string
unquoted-string = (%x41-5A / %x61-7A / %x5F) *( ; A-Za-z_
%x30-39 / ; 0-9
%x41-5A / ; A-Z
%x5F / ; _
%x61-7A) ; a-z
quoted-string = quote 1*(unescaped-char / escaped-char) quote
unescaped-char = %x20-21 / %x23-5B / %x5D-10FFFF
escape = %x5C ; Back slash: \
quote = %x22 ; Double quote: '"'
escaped-char = escape (
%x22 / ; " quotation mark U+0022
%x5C / ; \ reverse solidus U+005C
%x2F / ; / solidus U+002F
%x62 / ; b backspace U+0008
%x66 / ; f form feed U+000C
%x6E / ; n line feed U+000A
%x72 / ; r carriage return U+000D
%x74 / ; t tab U+0009
%x75 4HEXDIG ) ; uXXXX U+XXXX
; The ``json-value`` is any valid JSON value
```
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