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ankoを使ってプラグイン機構っぽいのを実装してみた
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filter.Add(func(s) { | |
return strings.ToLower(s) | |
}, 10) |
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package main | |
import ( | |
"flag" | |
"fmt" | |
"io/ioutil" | |
"log" | |
"os" | |
"path/filepath" | |
"reflect" | |
"sort" | |
anko_core "github.com/mattn/anko/builtins" | |
anko_encoding "github.com/mattn/anko/builtins/encoding" | |
anko_flag "github.com/mattn/anko/builtins/flag" | |
anko_io "github.com/mattn/anko/builtins/io" | |
anko_math "github.com/mattn/anko/builtins/math" | |
anko_net "github.com/mattn/anko/builtins/net" | |
anko_os "github.com/mattn/anko/builtins/os" | |
anko_path "github.com/mattn/anko/builtins/path" | |
anko_regexp "github.com/mattn/anko/builtins/regexp" | |
anko_sort "github.com/mattn/anko/builtins/sort" | |
anko_strings "github.com/mattn/anko/builtins/strings" | |
anko_term "github.com/mattn/anko/builtins/term" | |
"github.com/mattn/anko/parser" | |
"github.com/mattn/anko/vm" | |
) | |
type Env vm.Env | |
func NewEnv() *Env { | |
env := vm.NewEnv() | |
anko_core.Import(env) | |
anko_flag.Import(env) | |
anko_net.Import(env) | |
anko_encoding.Import(env) | |
anko_os.Import(env) | |
anko_io.Import(env) | |
anko_math.Import(env) | |
anko_path.Import(env) | |
anko_regexp.Import(env) | |
anko_sort.Import(env) | |
anko_strings.Import(env) | |
anko_term.Import(env) | |
return (*Env)(env) | |
} | |
func (env *Env) Define(mod string, name string, i interface{}) { | |
var m *vm.Env | |
if mod == "" { | |
m = (*vm.Env)(env) | |
} else { | |
v, err := (*vm.Env)(env).Get(mod) | |
if err != nil { | |
m = (*vm.Env)(env).NewModule(mod) | |
} else { | |
m, _ = v.Interface().(*vm.Env) | |
} | |
} | |
m.Define(name, reflect.ValueOf(i)) | |
} | |
type filter struct { | |
function func(s string) string | |
priority int64 | |
} | |
func (f *filter) Apply(s string) string { | |
return f.function(s) | |
} | |
type Filters []*filter | |
func (f Filters) Len() int { | |
return len(f) | |
} | |
func (f Filters) Less(i, j int) bool { | |
return f[i].priority < f[j].priority | |
} | |
func (f Filters) Swap(i, j int) { | |
f[i], f[j] = f[j], f[i] | |
} | |
func init() { | |
flag.Usage = func() { | |
fmt.Fprintf(os.Stderr, "Usage: %s STRING\n", os.Args[0]) | |
flag.PrintDefaults() | |
} | |
} | |
func main() { | |
flag.Parse() | |
if len(os.Args) < 2 { | |
flag.Usage() | |
os.Exit(1) | |
} | |
filters := make(Filters, 0) | |
env := NewEnv() | |
env.Define("filter", "Add", func(f interface{}, prio interface{}) { | |
filter := &filter{ | |
func(s string) string { | |
v, _ := f.(vm.Func)(reflect.ValueOf(s)) | |
return v.String() | |
}, | |
prio.(int64), | |
} | |
filters = append(filters, filter) | |
}) | |
plugins, _ := filepath.Glob("*.ank") | |
for _, p := range plugins { | |
stat, err := os.Stat(p) | |
if err != nil { | |
log.Println(p, err) | |
continue | |
} | |
if stat.Mode().IsDir() { | |
continue | |
} | |
code, err := ioutil.ReadFile(p) | |
if err != nil { | |
log.Println(p, err) | |
continue | |
} | |
scanner := new(parser.Scanner) | |
scanner.Init(string(code)) | |
stmts, err := parser.Parse(scanner) | |
if err != nil { | |
log.Println(p, err) | |
continue | |
} | |
_, err = vm.Run(stmts, (*vm.Env)(env)) | |
if err != nil { | |
log.Println(p, err) | |
continue | |
} | |
} | |
str := os.Args[1] | |
sort.Sort(filters) | |
for _, f := range filters { | |
str = f.Apply(str) | |
} | |
fmt.Printf("Filtered: \"%s\"\n", str) | |
} |
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filter.Add(func(s) { | |
return strings.Trim(s, " ") | |
}, 100) |
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filter.Add(func(s) { | |
return strings.ToUpper(s) | |
}, 100) |
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mattn/anko