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oneof.go
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oneof.go
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// Copyright 2023 Sneller, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package versify
import (
"fmt"
"math/rand"
"strings"
"github.com/SnellerInc/sneller/ion"
)
const (
missingType = ion.ReservedType
ntypes = ion.ReservedType + 1
)
// Any is a generator that generates
// ion datums of different types based
// on their relative frequency of occurrence
// in the input corpus.
//
// Note that a value being "missing" (returned as nil)
// is considered to be a distinct type in terms
// of drawing from the distribution of inputs.
type Any struct {
typemap [ntypes]Union
hits [ntypes]int
total int
}
func (o *Any) Generate(src *rand.Rand) ion.Datum {
n := rand.Intn(o.total)
i := 0
for n > o.hits[i] || o.typemap[i] == nil {
n -= o.hits[i]
i++
}
return o.typemap[i].Generate(src)
}
func (o *Any) Add(value ion.Datum) Union {
var t ion.Type
if value.IsEmpty() {
t = missingType
} else {
t = value.Type()
if t == ion.UintType {
t = ion.IntType
}
}
o.hits[t]++
o.total++
if o.typemap[t] == nil {
o.typemap[t] = Single(value)
} else {
o.typemap[t] = o.typemap[t].Add(value)
}
return o
}
func (o *Any) String() string {
var out strings.Builder
out.WriteString("any{")
first := true
for i := ion.Type(0); i < ntypes; i++ {
c := o.hits[i]
if c == 0 {
continue
}
if !first {
out.WriteString(", ")
}
fmt.Fprintf(&out, "%.02f: %s", (100*float64(c))/float64(o.total), o.typemap[i])
first = false
}
out.WriteString("}")
return out.String()
}