Method toArrayOrSet

runtime/sam/expr/function/cast.go:147–184

(from super.Value, to super.Type)

}

func (c *cast) toArrayOrSet(from super.Value, to super.Type) (super.Value, bool) {
	fromInner := super.InnerType(from.Type())
	toInner := super.InnerType(to)
	if fromInner == nil {
		// XXX Should also return an error if casting from fromInner to
		// toInner will always fail.
		return c.error(from, to)
	}
	types := map[super.Type]struct{}{}
	var vals []super.Value
	aok := true
	for it := from.ContainerIter(); !it.Done(); {
		val, ok := c.castNext(&it, fromInner, toInner)
		aok = aok && ok
		types[val.Type()] = struct{}{}
		vals = append(vals, val)
	}
	if len(vals) == 0 {
		return super.NewValue(to, from.Bytes()), aok
	}
	inner, ok := c.maybeConvertToUnion(vals, types)
	aok = aok && ok
	if inner != toInner {
		if to.Kind() == super.ArrayKind {
			to = c.sctx.LookupTypeArray(inner)
		} else {
			to = c.sctx.LookupTypeSet(inner)
		}
	}
	var bytes scode.Bytes
	for _, val := range vals {
		bytes = scode.Append(bytes, val.Bytes())
	}
	if to.Kind() == super.SetKind {
		bytes = super.NormalizeSet(bytes)
	}
	return super.NewValue(to, bytes), aok
}

func (c *cast) castNext(it *scode.Iter, from, to super.Type) (super.Value, bool) {
	val := super.NewValue(from, it.Next())