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playground.go
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playground.go
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package nj
import (
"bytes"
_ "embed"
"encoding/json"
"fmt"
"net/http"
"reflect"
"strconv"
"strings"
"time"
"github.com/coyove/nj/bas"
"github.com/coyove/nj/internal"
"github.com/coyove/nj/typ"
)
//go:embed playground.html
var playgroundHTML []byte
var playgroundCode = `
-- Author: coyove
_, author = re([[Author: (\S+)]]).find(Program.Source)
println("Author is:", author)
-- Print all global values
local g = debug.globals()
print("version %d, total global values: %d".format(VERSION, #g/3))
function pp(idx, f)
if f == nil then return end
if f is callable then
print(idx, ": function ", f)
else
print(idx, ": ", json.stringify(f))
end
end
for i=0,#g,3 do
pp(i//3, g[i + 2])
end`
func PlaygroundHandler(defaultCode string, opt *LoadOptions) func(w http.ResponseWriter, r *http.Request) {
return func(w http.ResponseWriter, r *http.Request) {
defer func() { recover() }()
c := getCode(r)
if c == "" {
w.Header().Add("Content-Type", "text/html")
var names []string
var dedup = map[string]bool{}
var add = func(n string) {
if !dedup[n] {
dedup[n], names = true, append(names, strconv.Quote(n))
}
}
var add2 = func(f, n string, force bool) {
if force || n[0] >= 'A' && n[0] <= 'Z' {
add("(" + f + ")." + n)
}
}
var addType func(reflect.Type)
addType = func(rf reflect.Type) {
rfs := rf.String()
if dedup[rfs] {
return
}
dedup[rfs] = true
rff := rf
if rf.Kind() == reflect.Ptr {
rff = rff.Elem()
}
if rff.Kind() == reflect.Struct {
s := rff.String()
for i := 0; i < rff.NumField(); i++ {
add2(s, rff.Field(i).Name, false)
addType(rff.Field(i).Type)
}
for i := 0; i < rf.NumMethod(); i++ {
add2(rfs, rf.Method(i).Name, false)
}
if rf != rff {
for i := 0; i < rff.NumMethod(); i++ {
add2(s, rff.Method(i).Name, false)
}
}
}
}
x := bas.TopSymbols()
if opt != nil {
x.Merge(&opt.Globals)
}
x.Foreach(func(k bas.Value, v *bas.Value) bool {
add(k.String())
switch v.Type() {
case typ.Object:
v.Object().Foreach(func(kk bas.Value, vv *bas.Value) bool {
add2(k.String(), kk.String(), true)
return true
})
case typ.Native:
addType(reflect.ValueOf(v.Interface()).Type())
}
return true
})
buf := bytes.Replace(playgroundHTML, []byte("__NAMES__"), []byte(strings.Join(names, ",")), -1)
if defaultCode != "" {
buf = bytes.Replace(buf, []byte("__CODE__"), []byte(defaultCode), -1)
} else {
buf = bytes.Replace(buf, []byte("__CODE__"), []byte(playgroundCode), -1)
}
w.Write(buf)
return
}
start := time.Now()
bufOut := &internal.LimitedBuffer{Limit: 32 * 1024}
p, err := LoadString(c, opt)
if err != nil {
writeJSON(w, map[string]interface{}{"error": err.Error()})
return
}
p.MaxStackSize = 1000
p.Stdout = bufOut
p.Stderr = bufOut
code := p.GoString()
v := p.Run()
switch outf := r.URL.Query().Get("output"); outf {
case "stdout":
writeJSON(w, map[string]interface{}{"stdout": bufOut.String()})
case "result":
writeJSON(w, map[string]interface{}{"result": fmt.Sprint(v)})
default:
writeJSON(w, map[string]interface{}{
"elapsed": time.Since(start).Seconds(),
"result": fmt.Sprint(v),
"stdout": bufOut.String(),
"opcode": code,
})
}
}
}
func writeJSON(w http.ResponseWriter, m map[string]interface{}) {
// w.Header().Add("Access-Control-Allow-Origin", "*")
w.Header().Add("Content-Type", "application/json")
buf, _ := json.Marshal(m)
w.Write(buf)
}
func getCode(r *http.Request) string {
c := strings.TrimSpace(r.FormValue("code"))
if c == "" {
c = strings.TrimSpace(r.URL.Query().Get("code"))
}
if len(c) > 16*1024 {
c = c[:16*1024]
}
return c
}