/* Title: Pure/General/json.scala
Author: Makarius
Support for JSON: https://www.json.org/.
See also http://seriot.ch/parsing_json.php "Parsing JSON is a Minefield".
*/
package isabelle
import scala.util.matching.Regex
import scala.util.parsing.combinator.Parsers
import scala.util.parsing.combinator.lexical.Scanners
import scala.util.parsing.input.CharArrayReader.EofCh
object JSON
{
type T = Any
type S = String
object Object
{
type Entry = (String, JSON.T)
type T = Map[String, JSON.T]
val empty: Object.T = Map.empty
def apply(entries: Entry*): Object.T = Map(entries:_*)
def unapply(obj: Any): Option[Object.T] =
obj match {
case m: Map[_, _] if m.keySet.forall(_.isInstanceOf[String]) =>
Some(m.asInstanceOf[Object.T])
case _ => None
}
}
/* lexer */
object Kind extends Enumeration
{
val KEYWORD, STRING, NUMBER, ERROR = Value
}
sealed case class Token(kind: Kind.Value, text: String)
{
def is_keyword: Boolean = kind == Kind.KEYWORD
def is_keyword(name: String): Boolean = kind == Kind.KEYWORD && text == name
def is_string: Boolean = kind == Kind.STRING
def is_number: Boolean = kind == Kind.NUMBER
def is_error: Boolean = kind == Kind.ERROR
}
object Lexer extends Scanners with Scan.Parsers
{
override type Elem = Char
type Token = JSON.Token
def errorToken(msg: String): Token = Token(Kind.ERROR, msg)
val white_space: String = " \t\n\r"
override val whiteSpace: Regex = ("[" + white_space + "]+").r
def whitespace: Parser[Any] = many(character(white_space.contains(_)))
val letter: Parser[String] = one(character(Symbol.is_ascii_letter))
val letters1: Parser[String] = many1(character(Symbol.is_ascii_letter))
def digits: Parser[String] = many(character(Symbol.is_ascii_digit))
def digits1: Parser[String] = many1(character(Symbol.is_ascii_digit))
/* keyword */
def keyword: Parser[Token] =
(letters1 | one(character("{}[],:".contains(_)))) ^^ (s => Token(Kind.KEYWORD, s))
/* string */
def string: Parser[Token] =
'\"' ~> rep(string_body) <~ '\"' ^^ (cs => Token(Kind.STRING, cs.mkString))
def string_body: Parser[Char] =
elem("", c => c > '\u001f' && c != '\"' && c != '\\' && c != EofCh) | '\\' ~> string_escape
def string_escape: Parser[Char] =
elem("", "\"\\/".contains(_)) |
elem("", "bfnrt".contains(_)) ^^
{ case 'b' => '\b' case 'f' => '\f' case 'n' => '\n' case 'r' => '\r' case 't' => '\t' } |
'u' ~> repeated(character("0123456789abcdefABCDEF".contains(_)), 4, 4) ^^
(s => Integer.parseInt(s, 16).toChar)
def string_failure: Parser[Token] = '\"' ~> failure("Unterminated string")
/* number */
def number: Parser[Token] =
opt("-") ~ number_body ~ opt(letter) ^^ {
case a ~ b ~ None => Token(Kind.NUMBER, a.getOrElse("") + b)
case a ~ b ~ Some(c) =>
errorToken("Invalid number format: " + quote(a.getOrElse("") + b + c))
}
def number_body: Parser[String] =
(zero | positive) ~ opt(number_fract) ~ opt(number_exp) ^^
{ case a ~ b ~ c => a + b.getOrElse("") + c.getOrElse("") }
def number_fract: Parser[String] = "." ~ digits1 ^^ { case a ~ b => a + b }
def number_exp: Parser[String] =
one(character("eE".contains(_))) ~ maybe(character("-+".contains(_))) ~ digits1 ^^
{ case a ~ b ~ c => a + b + c }
def zero: Parser[String] = one(character(c => c == '0'))
def nonzero: Parser[String] = one(character(c => c != '0' && Symbol.is_ascii_digit(c)))
def positive: Parser[String] = nonzero ~ digits ^^ { case a ~ b => a + b }
/* token */
def token: Parser[Token] =
keyword | (string | (string_failure | (number | failure("Illegal character"))))
}
/* parser */
trait Parser extends Parsers
{
type Elem = Token
def $$$(name: String): Parser[Token] = elem(name, _.is_keyword(name))
def string: Parser[String] = elem("string", _.is_string) ^^ (_.text)
def number: Parser[Double] = elem("number", _.is_number) ^^ (tok => tok.text.toDouble)
def json_object: Parser[Object.T] =
$$$("{") ~>
repsep(string ~ ($$$(":") ~> json_value) ^^ { case a ~ b => (a, b) }, $$$(",")) <~
$$$("}") ^^ (_.toMap)
def json_array: Parser[List[T]] =
$$$("[") ~> repsep(json_value, $$$(",")) <~ $$$("]")
def json_value: Parser[T] =
json_object | (json_array | (number | (string |
($$$("true") ^^^ true | ($$$("false") ^^^ false | ($$$("null") ^^^ null))))))
def parse(input: CharSequence, strict: Boolean): T =
{
val scanner = new Lexer.Scanner(Scan.char_reader(input))
phrase(if (strict) json_object | json_array else json_value)(scanner) match {
case Success(json, _) => json
case NoSuccess(_, next) => error("Malformed JSON input at " + next.pos)
}
}
}
object Parser extends Parser
/* standard format */
def parse(s: S, strict: Boolean = true): T = Parser.parse(s, strict)
object Format
{
def unapply(s: S): Option[T] =
try { Some(parse(s, strict = false)) }
catch { case ERROR(_) => None }
def apply(json: T): S =
{
val result = new StringBuilder
def string(s: String)
{
result += '"'
result ++=
s.iterator.map {
case '"' => "\\\""
case '\\' => "\\\\"
case '\b' => "\\b"
case '\f' => "\\f"
case '\n' => "\\n"
case '\r' => "\\r"
case '\t' => "\\t"
case c =>
if (c <= '\u001f' || c >= '\u007f' && c <= '\u009f') "\\u%04x".format(c.toInt)
else c
}.mkString
result += '"'
}
def array(list: List[T])
{
result += '['
Library.separate(None, list.map(Some(_))).foreach({
case None => result += ','
case Some(x) => json_format(x)
})
result += ']'
}
def object_(obj: Object.T)
{
result += '{'
Library.separate(None, obj.toList.map(Some(_))).foreach({
case None => result += ','
case Some((x, y)) =>
string(x)
result += ':'
json_format(y)
})
result += '}'
}
def json_format(x: T)
{
x match {
case null => result ++= "null"
case _: Int | _: Long | _: Boolean => result ++= x.toString
case n: Double =>
val i = n.toLong
result ++= (if (i.toDouble == n) i.toString else n.toString)
case s: String => string(s)
case Object(m) => object_(m)
case list: List[T] => array(list)
case _ => error("Bad JSON value: " + x.toString)
}
}
json_format(json)
result.toString
}
}
/* typed values */
object Value
{
object UUID
{
def unapply(json: T): Option[isabelle.UUID.T] =
json match {
case x: java.lang.String => isabelle.UUID.unapply(x)
case _ => None
}
}
object String
{
def unapply(json: T): Option[java.lang.String] =
json match {
case x: java.lang.String => Some(x)
case _ => None
}
}
object String0
{
def unapply(json: T): Option[java.lang.String] =
json match {
case null => Some("")
case x: java.lang.String => Some(x)
case _ => None
}
}
object Double
{
def unapply(json: T): Option[scala.Double] =
json match {
case x: scala.Double => Some(x)
case x: scala.Long => Some(x.toDouble)
case x: scala.Int => Some(x.toDouble)
case _ => None
}
}
object Long
{
def unapply(json: T): Option[scala.Long] =
json match {
case x: scala.Double if x.toLong.toDouble == x => Some(x.toLong)
case x: scala.Long => Some(x)
case x: scala.Int => Some(x.toLong)
case _ => None
}
}
object Int
{
def unapply(json: T): Option[scala.Int] =
json match {
case x: scala.Double if x.toInt.toDouble == x => Some(x.toInt)
case x: scala.Long if x.toInt.toLong == x => Some(x.toInt)
case x: scala.Int => Some(x)
case _ => None
}
}
object Boolean
{
def unapply(json: T): Option[scala.Boolean] =
json match {
case x: scala.Boolean => Some(x)
case _ => None
}
}
object List
{
def unapply[A](json: T, unapply: T => Option[A]): Option[List[A]] =
json match {
case xs: List[T] =>
val ys = xs.map(unapply)
if (ys.forall(_.isDefined)) Some(ys.map(_.get)) else None
case _ => None
}
}
object Seconds
{
def unapply(json: T): Option[Time] =
Double.unapply(json).map(Time.seconds)
}
}
/* object values */
def optional(entry: (String, Option[T])): Object.T =
entry match {
case (name, Some(x)) => Object(name -> x)
case (_, None) => Object.empty
}
def value(obj: T, name: String): Option[T] =
obj match {
case Object(m) => m.get(name)
case _ => None
}
def value[A](obj: T, name: String, unapply: T => Option[A]): Option[A] =
for {
json <- value(obj, name)
x <- unapply(json)
} yield x
def array(obj: T, name: String): Option[List[T]] =
value(obj, name) match {
case Some(a: List[T]) => Some(a)
case _ => None
}
def value_default[A](obj: T, name: String, unapply: T => Option[A], default: => A): Option[A] =
value(obj, name) match {
case None => Some(default)
case Some(json) => unapply(json)
}
def uuid(obj: T, name: String): Option[UUID.T] =
value(obj, name, Value.UUID.unapply)
def string(obj: T, name: String): Option[String] =
value(obj, name, Value.String.unapply)
def string_default(obj: T, name: String, default: => String = ""): Option[String] =
value_default(obj, name, Value.String.unapply, default)
def string0(obj: T, name: String): Option[String] =
value(obj, name, Value.String0.unapply)
def string0_default(obj: T, name: String, default: => String = ""): Option[String] =
value_default(obj, name, Value.String0.unapply, default)
def double(obj: T, name: String): Option[Double] =
value(obj, name, Value.Double.unapply)
def double_default(obj: T, name: String, default: => Double = 0.0): Option[Double] =
value_default(obj, name, Value.Double.unapply, default)
def long(obj: T, name: String): Option[Long] =
value(obj, name, Value.Long.unapply)
def long_default(obj: T, name: String, default: => Long = 0): Option[Long] =
value_default(obj, name, Value.Long.unapply, default)
def int(obj: T, name: String): Option[Int] =
value(obj, name, Value.Int.unapply)
def int_default(obj: T, name: String, default: => Int = 0): Option[Int] =
value_default(obj, name, Value.Int.unapply, default)
def bool(obj: T, name: String): Option[Boolean] =
value(obj, name, Value.Boolean.unapply)
def bool_default(obj: T, name: String, default: => Boolean = false): Option[Boolean] =
value_default(obj, name, Value.Boolean.unapply, default)
def list[A](obj: T, name: String, unapply: T => Option[A]): Option[List[A]] =
value(obj, name, Value.List.unapply(_, unapply))
def list_default[A](obj: T, name: String, unapply: T => Option[A], default: => List[A] = Nil)
: Option[List[A]] = value_default(obj, name, Value.List.unapply(_, unapply), default)
def strings(obj: T, name: String): Option[List[String]] =
list(obj, name, JSON.Value.String.unapply)
def strings_default(obj: T, name: String, default: => List[String] = Nil): Option[List[String]] =
list_default(obj, name, JSON.Value.String.unapply, default)
def seconds(obj: T, name: String): Option[Time] =
value(obj, name, Value.Seconds.unapply)
def seconds_default(obj: T, name: String, default: => Time = Time.zero): Option[Time] =
value_default(obj, name, Value.Seconds.unapply, default)
}
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