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decode.go
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decode.go
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// Copyright ©2017 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 slha
import (
"bufio"
"bytes"
"fmt"
"io"
"math"
"os"
"reflect"
"regexp"
"strconv"
"strings"
)
var (
reBlock = regexp.MustCompile(`BLOCK\s+(\w+)(\s+Q\s*=\s*.+)?`)
reDecay = regexp.MustCompile(`DECAY\s+(-?\d+)\s+([\d\.E+-]+|NAN).*`)
)
// Decode reads SLHA informations from r and returns them as a *slha.SLHA.
func Decode(r io.Reader) (*SLHA, error) {
var err error
type stateType int
const (
stBlock stateType = 1
stDecay stateType = 2
)
var state stateType
var blk *Block
var part *Particle
var data SLHA
scan := bufio.NewScanner(r)
for scan.Scan() {
bline := scan.Bytes()
if len(bline) <= 0 {
continue
}
if bline[0] == '#' {
// TODO(sbinet) store block/entry comments
continue
}
bup := bytes.ToUpper(bline)
switch bup[0] {
case 'B':
idx := bytes.Index(bup, []byte("#"))
comment := ""
if idx > 0 {
comment = strings.TrimSpace(string(bline[idx+1:]))
bup = bytes.TrimSpace(bup[:idx])
}
// fmt.Printf("Block> %q (comment=%q)\n", string(bup), comment)
state = stBlock
all := reBlock.FindStringSubmatch(string(bup))
if all == nil {
return nil, fmt.Errorf("slha.decode: invalid block: %q", string(bline))
}
groups := all[1:]
// for i, v := range groups {
// fmt.Printf(" %d/%d: %q\n", i+1, len(groups), v)
// }
i := len(data.Blocks)
data.Blocks = append(data.Blocks, Block{
Name: groups[0],
Comment: comment,
Q: math.NaN(),
Data: make(DataArray, 0),
})
blk = &data.Blocks[i]
if len(groups) > 1 && groups[1] != "" {
qstr := groups[1]
idx := strings.Index(qstr, "=")
if idx > 0 {
qstr = strings.TrimSpace(qstr[idx+1:])
}
blk.Q, err = strconv.ParseFloat(qstr, 64)
if err != nil {
return nil, err
}
}
// fmt.Printf("Block> %v\n", blk)
case 'D':
state = stDecay
idx := bytes.Index(bup, []byte("#"))
comment := ""
if idx > 0 {
comment = strings.TrimSpace(string(bline[idx+1:]))
bup = bytes.TrimSpace(bup[:idx])
}
all := reDecay.FindStringSubmatch(string(bup))
if all == nil {
return nil, fmt.Errorf("slha.decode: invalid decay: %q", string(bline))
}
groups := all[1:]
pdgid, err := strconv.Atoi(groups[0])
if err != nil {
return nil, err
}
width := math.NaN()
if len(groups) > 1 && groups[1] != "" {
width, err = strconv.ParseFloat(groups[1], 64)
if err != nil {
return nil, err
}
}
i := len(data.Particles)
data.Particles = append(data.Particles, Particle{
PdgID: pdgid,
Width: width,
Mass: math.NaN(),
Comment: comment,
Decays: make(Decays, 0, 2),
})
part = &data.Particles[i]
case '\t', ' ':
// data line
switch state {
case stBlock:
err = addBlockEntry(bline, blk)
if err != nil {
return nil, err
}
case stDecay:
err = addDecayEntry(bline, part)
if err != nil {
return nil, err
}
}
default:
fmt.Fprintf(os.Stderr, "**WARN** ignoring unknown section [%s]\n", string(bup))
}
}
err = scan.Err()
if err != nil {
if err != io.EOF {
return nil, err
}
err = nil
}
// try to populate particles' masses from the MASS block
if blk := data.Blocks.Get("MASS"); blk != nil {
for i := range data.Particles {
part := &data.Particles[i]
pdgid := part.PdgID
val, err := blk.Get(pdgid)
if err == nil {
part.Mass = val.Float()
}
}
}
return &data, err
}
func addBlockEntry(line []byte, blk *Block) error {
var err error
var val Value
hidx := bytes.Index(line, []byte("#"))
if hidx > 0 {
val.c = strings.TrimSpace(string(line[hidx+1:]))
line = line[:hidx]
}
line = bytes.TrimSpace(line)
tokens := make([][]byte, 0, 3)
for _, tok := range bytes.Split(line, []byte(" ")) {
if len(tok) <= 0 || bytes.Equal(tok, []byte("")) {
continue
}
tokens = append(tokens, tok)
}
// switch blk.Name {
// case "DCINFO":
// tokens
// }
ntokens := len(tokens) - 1
index := make([]int, ntokens)
for i := range index {
tok := string(tokens[i])
index[i], err = strconv.Atoi(tok)
if err != nil {
return fmt.Errorf("slha.decode: invalid index %q. err=%v", tok, err)
}
}
sval := string(tokens[len(index)])
switch blk.Name {
case "MODSEL":
v, err := strconv.Atoi(sval)
if err != nil {
return err
}
val.v = reflect.ValueOf(v)
case "SPINFO", "DCINFO":
val.v = reflect.ValueOf(sval)
default:
v, err := anyvalue(sval)
if err != nil {
return err
}
val.v = reflect.ValueOf(v)
}
// fmt.Printf("--- %q (comment=%q) len=%d indices=%v val=%#v\n", string(line), val.c, len(tokens), index, val.Interface())
blk.Data = append(blk.Data, DataItem{
Index: NewIndex(index...),
Value: val,
})
return err
}
func anyvalue(str string) (interface{}, error) {
var err error
var vv interface{}
vfloat, err := strconv.ParseFloat(str, 64)
if err == nil {
vv = reflect.ValueOf(vfloat).Interface()
return vv, err
}
if strings.Count(str, "D") == 1 {
vfloat, err = strconv.ParseFloat(strings.Replace(str, "D", "E", 1), 64)
if err == nil {
vv = reflect.ValueOf(vfloat).Interface()
return vv, err
}
}
if strings.Count(str, "d") == 1 {
vfloat, err = strconv.ParseFloat(strings.Replace(str, "d", "E", 1), 64)
if err == nil {
vv = reflect.ValueOf(vfloat).Interface()
return vv, err
}
}
vint, err := strconv.Atoi(str)
if err == nil {
vv = reflect.ValueOf(int64(vint)).Interface()
return vv, err
}
vv = str
return vv, err
}
func addDecayEntry(line []byte, part *Particle) error {
var err error
comment := ""
hidx := bytes.Index(line, []byte("#"))
if hidx > 0 {
comment = strings.TrimSpace(string(line[hidx+1:]))
line = line[:hidx]
}
line = bytes.TrimSpace(line)
tokens := make([][]byte, 0, 3)
for _, tok := range bytes.Split(line, []byte(" ")) {
if len(tok) <= 0 || bytes.Equal(tok, []byte("")) {
continue
}
tokens = append(tokens, tok)
}
br, err := strconv.ParseFloat(string(tokens[0]), 64)
if err != nil {
return fmt.Errorf("slha.decode: invalid decay line %q. err=%v", string(line), err)
}
nda, err := strconv.Atoi(string(tokens[1]))
if err != nil {
return fmt.Errorf("slha.decode: invalid decay line %q. err=%v", string(line), err)
}
ids := make([]int, nda)
toks := tokens[2:]
for i := range ids {
ids[i], err = strconv.Atoi(string(toks[i]))
if err != nil {
return fmt.Errorf("slha.decode: invalid decay line %q. err=%v", string(line), err)
}
}
part.Decays = append(part.Decays, Decay{
Br: br,
IDs: ids,
Comment: comment,
})
// i := len(part.Decays) - 1
// fmt.Printf("--- %q (comment=%q) len=%d decay=%#v\n", string(line), comment, len(tokens), part.Decays[i])
return err
}