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module Json =
(* A generic lens for Json files *)
(* Based on the following grammar from http://www.json.org/ *)
(* Object ::= '{'Members ? '}' *)
(* Members ::= Pair+ *)
(* Pair ::= String ':' Value *)
(* Array ::= '[' Elements ']' *)
(* Elements ::= Value ( "," Value )* *)
(* Value ::= String | Number | Object | Array | "true" | "false" | "null" *)
(* String ::= "\"" Char* "\"" *)
(* Number ::= /-?[0-9]+(\.[0-9]+)?([eE][+-]?[0-9]+)?/ *)
let spc = /[ \t\n]*/
let ws = del spc ""
let eol = del spc "\n"
let delim (c:string) (d:string) = del (c . spc) d
let dels (s:string) = del s s
let comma = delim "," ","
let colon = delim ":" ":"
let lbrace = delim "{" "{"
let rbrace = delim "}" "}"
let lbrack = delim "[" "["
let rbrack = delim "]" "]"
let str_store =
let q = del "\"" "\"" in
q . store /[^"]*/ . q . ws (* " Emacs, relax *)
let number = [ label "number" . store /-?[0-9]+(\.[0-9]+)?([eE][+-]?[0-9]+)?/ . ws ]
let str = [ label "string" . str_store ]
let const (r:regexp) = [ label "const" . store r . ws ]
let value0 = str | number | const /true|false|null/
let fix_value (value:lens) =
let array = [ label "array" . lbrack . (Build.opt_list value comma)? . rbrack ] in
let pair = [ label "entry" . str_store . colon . value ] in
let obj = [ label "dict" . lbrace . (Build.opt_list pair comma)? . rbrace ] in
(str | number | obj | array | const /true|false|null/)
(* Typecheck finitely deep nesting *)
let value1 = fix_value value0
let value2 = fix_value value1
(* Process arbitrarily deeply nested JSON objects *)
let rec rlns = fix_value rlns
let lns = ws . rlns