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|
package main
import (
"fmt"
"io"
"reflect"
"text/template"
)
const argMethodLoopBody = `v := a[i]
if !set {
f = v
{{.ArgX}} = i
set = true
continue
}
{{if isFloat .Kind -}}
if {{mathPkg .Kind}}IsNaN(v) || {{mathPkg .Kind}}IsInf(v, {{if eq .ArgX "min"}}-{{end}}1) {
{{.ArgX}} = i
return {{.ArgX}}
}
{{end -}}
if v {{if eq .ArgX "max"}}>{{else}}<{{end}} f {
{{.ArgX}} = i
f = v
}
`
const argMethodIter = `data := t.{{sliceOf .}}
tmp := make([]{{asType .}}, 0, lastSize)
for next, err = it.Next(); err == nil; next; err = it.Next() {
tmp = append(tmp, data[next])
if len(tmp) == lastSize {
am := {{.ArgX | title}}(tmp)
indices = append(indices, am)
tmp = tmp[:0]
}
}
return
`
type GenericArgMethod struct {
ArgX string
Masked bool
Range string
Kind reflect.Kind
}
func (fn *GenericArgMethod) Name() string {
switch {
case fn.ArgX == "max" && fn.Masked:
return "ArgmaxMasked"
case fn.ArgX == "min" && fn.Masked:
return "ArgminMasked"
case fn.ArgX == "max" && !fn.Masked:
return "Argmax"
case fn.ArgX == "min" && !fn.Masked:
return "Argmin"
}
panic("Unreachable")
}
func (fn *GenericArgMethod) Signature() *Signature {
paramNames := []string{"a"}
paramTemplates := []*template.Template{sliceType}
if fn.Masked {
paramNames = append(paramNames, "mask")
paramTemplates = append(paramTemplates, boolsType)
}
return &Signature{
Name: fn.Name(),
NameTemplate: typeAnnotatedName,
ParamNames: paramNames,
ParamTemplates: paramTemplates,
Kind: fn.Kind,
}
}
func (fn *GenericArgMethod) WriteBody(w io.Writer) {
T := template.Must(template.New(fn.Name()).Funcs(funcs).Parse(genericLoopRaw))
template.Must(T.New("loopbody").Parse(argMethodLoopBody))
if fn.Masked {
template.Must(T.New("check").Parse(maskCheck))
} else {
template.Must(T.New("check").Parse(""))
}
genericArgmaxVarDecl.Execute(w, fn)
T.Execute(w, fn)
fmt.Fprintf(w, "\nreturn %s\n", fn.ArgX)
}
func (fn *GenericArgMethod) Write(w io.Writer) {
sig := fn.Signature()
w.Write([]byte("func "))
sig.Write(w)
w.Write([]byte("int {\n"))
fn.WriteBody(w)
w.Write([]byte("}\n\n"))
}
func generateGenericArgMethods(f io.Writer, ak Kinds) {
var argMethods []*GenericArgMethod
for _, k := range ak.Kinds {
if !isOrd(k) {
continue
}
m := &GenericArgMethod{
ArgX: "max",
Kind: k,
Range: "a",
}
argMethods = append(argMethods, m)
}
// argmax
for _, m := range argMethods {
m.Write(f)
m.Masked = true
}
for _, m := range argMethods {
m.Write(f)
m.Masked = false
m.ArgX = "min"
}
// argmin
for _, m := range argMethods {
m.Write(f)
m.Masked = true
}
for _, m := range argMethods {
m.Write(f)
}
}
|
