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formula.go
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formula.go
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// Copyright ©2022 The go-hep Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package rhist
import (
"fmt"
"reflect"
"go-hep.org/x/hep/groot/rbase"
"go-hep.org/x/hep/groot/rbytes"
"go-hep.org/x/hep/groot/root"
"go-hep.org/x/hep/groot/rtypes"
"go-hep.org/x/hep/groot/rvers"
)
// Formula describes a ROOT TFormula.
type Formula struct {
named rbase.Named
clingParams []float64 // parameter values
allParamsSet bool // flag to control if all parameters are set
params map[string]int32 // list of parameter names
formula string // string representing the formula expression
ndim int32 // Dimension - needed for lambda expressions
linearParts []root.Object // vector of linear functions
vectorized bool // whether we should use vectorized or regular variables
}
func newFormula() *Formula {
return &Formula{
named: *rbase.NewNamed("", ""),
}
}
func (*Formula) RVersion() int16 {
return rvers.Formula
}
func (*Formula) Class() string {
return "TFormula"
}
// Name returns the name of the instance
func (f *Formula) Name() string {
return f.named.Name()
}
// Title returns the title of the instance
func (f *Formula) Title() string {
return f.named.Title()
}
// MarshalROOT implements rbytes.Marshaler
func (f *Formula) MarshalROOT(w *rbytes.WBuffer) (int, error) {
if w.Err() != nil {
return 0, w.Err()
}
hdr := w.WriteHeader(f.Class(), f.RVersion())
w.WriteObject(&f.named)
w.WriteStdVectorF64(f.clingParams)
w.WriteBool(f.allParamsSet)
writeMapStringInt(w, f.params)
w.WriteString(f.formula)
w.WriteI32(f.ndim)
writeStdVectorObjP(w, f.linearParts)
w.WriteBool(f.vectorized)
return w.SetHeader(hdr)
}
func (f *Formula) UnmarshalROOT(r *rbytes.RBuffer) error {
if r.Err() != nil {
return r.Err()
}
hdr := r.ReadHeader(f.Class(), f.RVersion())
if hdr.Vers < 12 || hdr.Vers > 13 {
// tested with v12 and v13
panic(fmt.Errorf("rhist: too old TFormula version=%d < 12", hdr.Vers))
}
r.ReadObject(&f.named)
r.ReadStdVectorF64(&f.clingParams)
f.allParamsSet = r.ReadBool()
f.params = readMapStringInt(r)
f.formula = r.ReadString()
f.ndim = r.ReadI32()
f.linearParts = readStdVectorObjP(r)
f.vectorized = r.ReadBool()
r.CheckHeader(hdr)
return r.Err()
}
func (f *Formula) String() string {
return fmt.Sprintf("TFormula{%s}", f.formula)
}
func readMapStringInt(r *rbytes.RBuffer) map[string]int32 {
if r.Err() != nil {
return nil
}
hdr := r.ReadHeader("map<TString,int,TFormulaParamOrder>", rvers.StreamerInfo)
n := int(r.ReadI32())
o := make(map[string]int32, n)
for i := 0; i < n; i++ {
k := r.ReadString()
v := r.ReadI32()
o[k] = v
}
r.CheckHeader(hdr)
return o
}
func readStdVectorObjP(r *rbytes.RBuffer) []root.Object {
if r.Err() != nil {
return nil
}
hdr := r.ReadHeader("vector<TObject*>", rvers.StreamerInfo)
n := int(r.ReadI32())
o := make([]root.Object, n)
for i := range o {
o[i] = r.ReadObjectAny()
}
r.CheckHeader(hdr)
return o
}
func writeMapStringInt(w *rbytes.WBuffer, m map[string]int32) {
if w.Err() != nil {
return
}
const typename = "map<TString,int,TFormulaParamOrder>"
hdr := w.WriteHeader(typename, rvers.StreamerInfo)
w.WriteI32(int32(len(m)))
// FIXME(sbinet): write in correct order?
for k, v := range m {
w.WriteString(k)
w.WriteI32(v)
}
_, _ = w.SetHeader(hdr)
}
func writeStdVectorObjP(w *rbytes.WBuffer, vs []root.Object) {
if w.Err() != nil {
return
}
const typename = "vector<TObject*>"
hdr := w.WriteHeader(typename, rvers.StreamerInfo)
w.WriteI32(int32(len(vs)))
for i := range vs {
w.WriteObjectAny(vs[i])
}
_, _ = w.SetHeader(hdr)
}
func init() {
{
f := func() reflect.Value {
o := newFormula()
return reflect.ValueOf(o)
}
rtypes.Factory.Add("TFormula", f)
}
}
var (
_ root.Object = (*Formula)(nil)
_ root.Named = (*Formula)(nil)
_ rbytes.Marshaler = (*Formula)(nil)
_ rbytes.Unmarshaler = (*Formula)(nil)
)