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pp and reflect
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Takashi Kokubun
June 21, 2015
Programming
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pp and reflect
Go Conference 2015 summer
Takashi Kokubun
June 21, 2015
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Transcript
pp and reflect Go Conference 2015 summer Takashi Kokubun
Who is k0kubun? • Twitter, GitHub: @k0kubun • Cookpad •
Rubyist
k0kubun/pp Colored Pretty Printer https://github.com/k0kubun/pp
k0kubun/pp • Prettily print any complex data structures • Simple
APIs like “fmt” import "github.com/k0kubun/pp" for _, tweet := range tweets { pp.Println(tweet) }
k0kubun/pp • Prettily print any complex data structures • Simple
APIs like “fmt”
k0kubun/pp ͷෆศͳॴ • ᶃ import͢ΔURL͕ࢥ͍ग़ͤͳ͍ • ᶄ import͢͠ͷ͕ΊΜͲ͍͘͞
import͢ΔURL͕ࢥ͍ग़ͤͳ͍ Ϣʔβʔͷෆຬᶃ
import͢ΔURL͕ࢥ͍ग़ͤͳ͍ import "github.com/◦◦◦/pp" ↑ ͜ͷਓ୭͚ͩͬ…
import͢ΔURL͕ࢥ͍ग़ͤͳ͍ ppͷcontributorͷํ
import͢ΔURL͕ࢥ͍ग़ͤͳ͍ ձࣾͷઌഐ ͍͍ͪͪιʔείʔυʹ k0kubun͞Μͷ໊લॻ͖ͨ͘ͳ͍Ͱ͢Ͷ…
go-pp/ppͱ͍͏forkΛimport import “github.com/go-pp/pp" or import “gopkg.in/pp.v2” ղܾํ๏ɿ
import͢͠ͷ͕ΊΜͲ͍͘͞ Ϣʔβʔͷෆຬᶄ
import͢͠ͷ͕ΊΜͲ͍͘͞ import "github.com/k0kubun/pp" ↑ pp.Println() Λॻ͍ͨΓফͨ͠Γ͢ ΔͨͼʹՃ͢͠ඞཁ͕͋Δ
ؔΛϥοϓͯ͠gitignore import p "github.com/k0kubun/pp" func pp(a ...interface{}) { p.Println(a...) }
• ʮ,*ʯΛgitignoreͯ͠ΔͳΒʮ,.goʯͱ͔ • ͬͯͳͯ͘importফ͞ͳͯ͘ࡁΉ ղܾํ๏ɿ
package “reflect” Standard library for reflection k0kubun/pp is powered by
“reflect”
What’s the usage of reflect? • ͷϝλใΛಡΉ • ppͩͱstructͷશfieldྻڍ •
encoding/jsonͩͱstructͷfieldͷλά • ϝλϓϩάϥϛϯά
ϝλϓϩάϥϛϯάͷಛ • εϚʔτͳॻ͖ํͰίʔυͷߦΛݮΒͤΔ • ॻָ͍͍ͯͯ͠ • ੩తղੳ͕͘͠ɺಡΈʹ͘͘ͳΔ • झຯҎ֎ͰΘͳ͍ͷ͕ແ
reflectͰͰ͖Δͷ࣍ͷ͏ͪͲΕʁ Go ϝλϓϩάϥϛϯάΫΠζ
reflectͰͰ͖Δͷ࣍ͷ͏ͪͲΕʁ ૢ࡞ ճ ؔఆٛ ؔݺͼग़͠ ϝιουఆٛ ϝιουݺͼग़͠ ҙͷܕͷOFX ˕ɿstringͰ໊લΛࢦఆՄɹ˓ɿreflect.Value͔ΒՄೳɹ×ɿແཧ ˕ɺ˓ɺ×
ώϯτ: Rubyશ෦˕
reflectͰͰ͖Δͷ࣍ͷ͏ͪͲΕʁ ૢ࡞ ճ ؔఆٛ ˓ ؔݺͼग़͠ ˓ ϝιουఆٛ º ϝιουݺͼग़͠
˕ ҙͷܕͷOFX ˓ ˕ɿstringͰ໊લΛࢦఆՄɹ˓ɿreflect.Value͔ΒՄೳɹ×ɿແཧ ϝλϓϩՄ
reflectʹΑΔؔఆٛ • ҙͷγάωνϟͷؔΛ࡞ΕΔ var f func(int, int) int v :=
reflect.MakeFunc( reflect.TypeOf(f), func(in []reflect.Value) []reflect.Value { return []reflect.Value{in[0]} }, ) reflect.ValueOf(&f).Elem().Set(v)
reflectʹΑΔؔݺͼग़͠ • ҙͷγάωνϟͷؔΛݺͼग़ͤΔ f := func(a int, b int) int
{ return a + b } v := reflect.ValueOf(f) in := []reflect.Value{} for i := 0; i < v.Type().NumIn(); i++ { in = append(in, reflect.ValueOf(1)) } v.Call(in)
reflectʹΑΔϝιουఆٛ • ී௨ʹແཧ
reflectʹΑΔϝιουݺͼग़͠ • stringͰ໊લΛࢦఆͯ͠ϝιουΛݺͼग़ͤΔ type Hoge struct{} func (h Hoge) Foo()
{ print("foo") } func (h Hoge) Bar() { print("bar") } h := new(Hoge) for _, name := range []string{"Foo", "Bar"} { v := reflect.ValueOf(h) v.MethodByName(name).Call([]reflect.Value{}) }
reflectʹΑΔnew • ҙͷܕͷΛॳظԽͨ͠ͷΛ࡞ΕΔ t := reflect.TypeOf(a) reflect.New(t)
·ͱΊ • k0kubun/ppͬͯԼ͍͞ • pp.Println() Λϥοϓͯ͠gitignore͓ͯ͘͠ • reflect͏ͱϝλϓϩͰ͖Δ • stringͰࢦఆͰ͖Δͷϝιουݺͼग़͠ͷΈ