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// RUN: %verify "%s" --unicode-char:true ../Unicode/UnicodeStringsWithUnicodeChar.dfy
/// ================================================
/// Serialization from JSON.Values to JSON.Grammar
/// ================================================
///
/// For the spec, see ``JSON.Spec.dfy``.
include "../Collections/Sequences/Seq.dfy"
include "../BoundedInts.dfy"
include "../Math.dfy"
include "Utils/Views.dfy"
include "Utils/Vectors.dfy"
include "Errors.dfy"
include "Values.dfy"
include "Grammar.dfy"
include "Spec.dfy"
module {:options "-functionSyntax:4"} JSON.Serializer {
import Seq
import Math
import opened Wrappers
import opened BoundedInts
import opened Utils.Str
import Values
import Spec
import opened Errors
import opened Utils.Vectors
import opened Grammar
import opened Utils.Views.Core
type Result<+T> = SerializationResult<T>
type bytes = seq<uint8>
type bytes32 = bs: bytes | |bs| < TWO_TO_THE_32
type string32 = s: string | |s| < TWO_TO_THE_32
function Bool(b: bool): jbool {
View.OfBytes(if b then TRUE else FALSE)
}
function CheckLength<T>(s: seq<T>, err: SerializationError): Outcome<SerializationError> {
Need(|s| < TWO_TO_THE_32, err)
}
function String(str: string): Result<jstring> {
var bs :- Spec.EscapeToUTF8(str);
:- CheckLength(bs, StringTooLong(str));
Success(Grammar.JString(Grammar.DOUBLEQUOTE, View.OfBytes(bs), Grammar.DOUBLEQUOTE))
}
function Sign(n: int): jminus {
View.OfBytes(if n < 0 then ['-' as byte] else [])
}
module ByteStrConversion refines Str.ParametricConversion {
import opened BoundedInts
type Char = uint8
}
const DIGITS := [
'0' as uint8, '1' as uint8, '2' as uint8, '3' as uint8,
'4' as uint8, '5' as uint8, '6' as uint8, '7' as uint8,
'8' as uint8, '9' as uint8
]
const MINUS := '-' as uint8
function Int'(n: int) : (str: bytes)
ensures forall c | c in str :: c in DIGITS || c == MINUS
{
ByteStrConversion.OfInt_any(n, DIGITS, MINUS)
}
function Int(n: int) : Result<View> {
var bs := Int'(n);
:- CheckLength(bs, IntTooLarge(n));
Success(View.OfBytes(bs))
}
function Number(dec: Values.Decimal): Result<jnumber> {
var minus: jminus := Sign(dec.n);
var num: jnum :- Int(Math.Abs(dec.n));
var frac: Maybe<jfrac> := Empty();
var exp: Maybe<jexp> :-
if dec.e10 == 0 then
Success(Empty())
else
var e: je := View.OfBytes(['e' as byte]);
var sign: jsign := Sign(dec.e10);
var num: jnum :- Int(Math.Abs(dec.e10));
Success(NonEmpty(JExp(e, sign, num)));
Success(JNumber(minus, num, Empty, exp))
}
function MkStructural<T>(v: T): Structural<T> {
Structural(EMPTY, v, EMPTY)
}
const COLON: Structural<jcolon> :=
MkStructural(Grammar.COLON)
function KeyValue(kv: (string, Values.JSON)): Result<jKeyValue> {
var k :- String(kv.0);
var v :- Value(kv.1);
Success(Grammar.KeyValue(k, COLON, v))
}
function MkSuffixedSequence<D, S>(ds: seq<D>, suffix: Structural<S>, start: nat := 0)
: SuffixedSequence<D, S>
decreases |ds| - start
{
if start >= |ds| then []
else if start == |ds| - 1 then [Suffixed(ds[start], Empty)]
else [Suffixed(ds[start], NonEmpty(suffix))] + MkSuffixedSequence(ds, suffix, start + 1)
}
const COMMA: Structural<jcomma> :=
MkStructural(Grammar.COMMA)
function Object(obj: seq<(string, Values.JSON)>): Result<jobject> {
var items :- Seq.MapWithResult(v requires v in obj => KeyValue(v), obj);
Success(Bracketed(MkStructural(LBRACE),
MkSuffixedSequence(items, COMMA),
MkStructural(RBRACE)))
}
function Array(arr: seq<Values.JSON>): Result<jarray> {
var items :- Seq.MapWithResult(v requires v in arr => Value(v), arr);
Success(Bracketed(MkStructural(LBRACKET),
MkSuffixedSequence(items, COMMA),
MkStructural(RBRACKET)))
}
function Value(js: Values.JSON): Result<Grammar.Value> {
match js
case Null => Success(Grammar.Null(View.OfBytes(NULL)))
case Bool(b) => Success(Grammar.Bool(Bool(b)))
case String(str) => var s :- String(str); Success(Grammar.String(s))
case Number(dec) => var n :- Number(dec); Success(Grammar.Number(n))
case Object(obj) => var o :- Object(obj); Success(Grammar.Object(o))
case Array(arr) => var a :- Array(arr); Success(Grammar.Array(a))
}
function JSON(js: Values.JSON): Result<Grammar.JSON> {
var val :- Value(js);
Success(MkStructural(val))
}
}
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