Tighten the conversion from tyRange to scalar types (#10495)

* Tighten the conversion from tyRange to scalar types.

Introduce the `isIntConv` rule for unsigned types.
Do not allow mixed-signedness conversions between ranges and scalar types.

* More json adjustments

compiler/sigmatch.nim

@@ -385,18 +385,19 @@ proc handleRange(f, a: PType, min, max: TTypeKind): TTypeRelation =
       result = isFromIntLit
     elif f.kind == tyInt and k in {tyInt8..tyInt32}:
       result = isIntConv
+    elif f.kind == tyUInt and k in {tyUInt8..tyUInt32}:
+      result = isIntConv
     elif k >= min and k <= max:
       result = isConvertible
-    elif a.kind == tyRange and a.sons[0].kind in {tyInt..tyInt64,
-                                                  tyUInt8..tyUInt32} and
-                         a.n[0].intVal >= firstOrd(nil, f) and
-                         a.n[1].intVal <= lastOrd(nil, f):
+    elif a.kind == tyRange and
+      # Make sure the conversion happens between types w/ same signedness
+      (f.kind in {tyInt..tyInt64} and a[0].kind in {tyInt..tyInt64} or
+       f.kind in {tyUInt8..tyUInt32} and a[0].kind in {tyUInt8..tyInt32}) and
+      a.n[0].intVal >= firstOrd(nil, f) and a.n[1].intVal <= lastOrd(nil, f):
       # passing 'nil' to firstOrd/lastOrd here as type checking rules should
       # not depent on the target integer size configurations!
       result = isConvertible
     else: result = isNone
-    #elif f.kind == tyInt and k in {tyInt..tyInt32}: result = isIntConv
-    #elif f.kind == tyUInt and k in {tyUInt..tyUInt32}: result = isIntConv
 
 proc isConvertibleToRange(f, a: PType): bool =
   # be less picky for tyRange, as that it is used for array indexing:

lib/pure/json.nim

@@ -313,6 +313,24 @@ proc `%`*(s: string): JsonNode =
   result.kind = JString
   result.str = s
 
+proc `%`*(n: uint): JsonNode =
+  ## Generic constructor for JSON data. Creates a new `JInt JsonNode`.
+  new(result)
+  result.kind = JInt
+  result.num  = BiggestInt(n)
+
+proc `%`*(n: int): JsonNode =
+  ## Generic constructor for JSON data. Creates a new `JInt JsonNode`.
+  new(result)
+  result.kind = JInt
+  result.num  = n
+
+proc `%`*(n: BiggestUInt): JsonNode =
+  ## Generic constructor for JSON data. Creates a new `JInt JsonNode`.
+  new(result)
+  result.kind = JInt
+  result.num  = BiggestInt(n)
+
 proc `%`*(n: BiggestInt): JsonNode =
   ## Generic constructor for JSON data. Creates a new `JInt JsonNode`.
   new(result)
@@ -1757,17 +1775,37 @@ when isMainModule:
   # Generate constructors for range[T] types
   block:
     type
-      Q1 = range[0..10]
-      Q2 = range[0'i8..10'i8]
-      Q3 = range[0'u16..10'u16]
+      Q1 = range[0'u8  .. 50'u8]
+      Q2 = range[0'u16 .. 50'u16]
+      Q3 = range[0'u32 .. 50'u32]
+      Q4 = range[0'i8  .. 50'i8]
+      Q5 = range[0'i16 .. 50'i16]
+      Q6 = range[0'i32 .. 50'i32]
+      Q7 = range[0'f32 .. 50'f32]
+      Q8 = range[0'f64 .. 50'f64]
+      Q9 = range[0     .. 50]
+
       X = object
         m1: Q1
         m2: Q2
         m3: Q3
+        m4: Q4
+        m5: Q5
+        m6: Q6
+        m7: Q7
+        m8: Q8
+        m9: Q9
 
-    let
-      obj = X(m1: 1, m2: 2'i8, m3: 3'u16)
-      jsonObj = %obj
-      desObj = to(jsonObj, type(obj))
+    let obj = X(
+      m1: Q1(42),
+      m2: Q2(42),
+      m3: Q3(42),
+      m4: Q4(42),
+      m5: Q5(42),
+      m6: Q6(42),
+      m7: Q7(42),
+      m8: Q8(42),
+      m9: Q9(42)
+    )
 
-    doAssert(desObj == obj)
+    doAssert(obj == to(%obj, type(obj)))

tests/range/trange.nim

@@ -105,3 +105,16 @@ block tcolors:
       return rgb(red(a) +! red(b), green(a) +! green(b), blue(a) +! blue(b))
 
     rgb(34, 55, 255)
+
+block:
+  type
+    R8  = range[0'u8 .. 10'u8]
+    R16 = range[0'u16 .. 10'u16]
+    R32 = range[0'u32 .. 10'u32]
+
+  var
+    x1 = R8(4)
+    x2 = R16(4)
+    x3 = R32(4)
+
+  doAssert $x1 & $x2 & $x3 == "444"