cue: add predeclared bounds for floats
As defined in the spec changes.
Change-Id: Idaffed59bd4e79c0b6de7949b3314d170fcf1018
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/1964
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/cue/value.go b/cue/value.go
index c28e461..19541f9 100644
--- a/cue/value.go
+++ b/cue/value.go
@@ -344,6 +344,19 @@
return num
}
+func parseFloat(s string) *numLit {
+ n := &ast.BasicLit{
+ Kind: token.FLOAT,
+ Value: s,
+ }
+ num := newNum(newExpr(n), floatKind)
+ _, _, err := num.v.SetString(s)
+ if err != nil {
+ panic(err)
+ }
+ return num
+}
+
func newNum(src source, k kind) *numLit {
n := &numLit{numBase: numBase{baseValue: src.base()}}
n.k = k
@@ -408,6 +421,22 @@
return e
}
+func mkFloatRange(a, b string) evaluated {
+ from := &bound{op: opGeq, value: parseFloat(a)}
+ to := &bound{op: opLeq, value: parseFloat(b)}
+ e := &unification{
+ binSrc(token.NoPos, opUnify, from, to),
+ []evaluated{from, to},
+ }
+ // TODO: make this an integer
+ // int := &basicType{k: intKind}
+ // e = &unification{
+ // binSrc(token.NoPos, opUnify, int, e),
+ // []evaluated{int, e},
+ // }
+ return e
+}
+
var predefinedRanges = map[string]evaluated{
"rune": mkIntRange("0", strconv.Itoa(0x10FFFF)),
"int8": mkIntRange("-128", "127"),
@@ -426,6 +455,17 @@
"uint32": mkIntRange("0", "4294967295"),
"uint64": mkIntRange("0", "18446744073709551615"),
"uint128": mkIntRange("0", "340282366920938463463374607431768211455"),
+
+ // 2**127 * (2**24 - 1) / 2**23
+ "float32": mkFloatRange(
+ "-3.40282346638528859811704183484516925440e+38",
+ "+3.40282346638528859811704183484516925440e+38",
+ ),
+ // 2**1023 * (2**53 - 1) / 2**52
+ "float64": mkFloatRange(
+ "-1.797693134862315708145274237317043567981e+308",
+ "+1.797693134862315708145274237317043567981e+308",
+ ),
}
type interpolation struct {
