json.pegjs

json.pegjs

{
  function mix(origin, target){
    var origin = origin || {};
    for (var i in target) {
    	origin[i] = target[i];
    }
    return origin;
  }
}

value
  = bool    
  / object
  / array
  / string
  / number
  / null

object
  = begin_object
  	members:object_members?
    end_object { return members === null ? {} : members}
    
object_members
  = head:object_member tail:followmember* {
    var result = mix({}, head);
    tail && tail.forEach(function (item) {
    	result = mix(result, item);        
    });     
    return result;
  } 

object_member
  = name:string namesep value:value { 
    var obj = {};
    obj[name] = value;
    return obj;
  }
  
followmember
  = membersep m:object_member { return m }    

array
  = begin_array
  	values: array_members?
    end_array {
    	return values !== null ? values : [];
    }    
    
array_members
  = head:value
    tail:(membersep v:value { return v; })*
    {
    	return [head].concat(tail); 
    }
  
string
  = '"' chars:char* '"' { return chars.join("") }
char
  = unescaped
  / escape
    sequence:(
        '"'
      / "\\"
      / "/"
      / "b" { return "\b"; }
      / "f" { return "\f"; }
      / "n" { return "\n"; }
      / "r" { return "\r"; }
      / "t" { return "\t"; }
      / "u" digits:$(HEXDIG HEXDIG HEXDIG HEXDIG) {
          return String.fromCharCode(parseInt(digits, 16));
        }
    )
    { return sequence; }
HEXDIG = [0-9a-f]i

escape         = "\\"
unescaped      = [^\0-\x1F\x22\x5C]

bool
  = "true" { return true }
  / "false" { return false }
number
  = "-"?[0-9]+("."[0-9])* { return parseFloat(text()) }
null
  = "null" { return null }

namesep = ws ":" ws
membersep = ws "," ws
begin_object = ws "{" ws
end_object = ws "}" ws
begin_array = ws "[" ws
end_array = ws "]" ws
ws = [ \t\n\r]*