go-vise

Constrained Size Output Virtual Machine
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main.go (2413B)

      1 // Example: Toggling states with external functions, with engine debugger.
      2 package main
      3 
      4 import (
      5 	"context"
      6 	"fmt"
      7 	"os"
      8 	"path"
      9 
     10 	testdataloader "github.com/peteole/testdata-loader"
     11 
     12 	fsdb "git.defalsify.org/vise.git/db/fs"
     13 	"git.defalsify.org/vise.git/engine"
     14 	"git.defalsify.org/vise.git/logging"
     15 	"git.defalsify.org/vise.git/resource"
     16 	"git.defalsify.org/vise.git/state"
     17 )
     18 
     19 const (
     20 	USER_FOO = iota + state.FLAG_USERSTART
     21 	USER_BAR
     22 	USER_BAZ
     23 )
     24 
     25 var (
     26 	logg      = logging.NewVanilla()
     27 	baseDir   = testdataloader.GetBasePath()
     28 	scriptDir = path.Join(baseDir, "examples", "state")
     29 )
     30 
     31 type flagResource struct {
     32 	st *state.State
     33 }
     34 
     35 func (f *flagResource) get(ctx context.Context, sym string, input []byte) (resource.Result, error) {
     36 	return resource.Result{
     37 		Content: state.FlagDebugger.AsString(f.st.Flags, 3),
     38 	}, nil
     39 }
     40 
     41 func (f *flagResource) do(ctx context.Context, sym string, input []byte) (resource.Result, error) {
     42 	var r resource.Result
     43 
     44 	logg.DebugCtxf(ctx, "in do", "sym", sym)
     45 
     46 	switch sym {
     47 	case "do_foo":
     48 		if f.st.MatchFlag(USER_FOO, false) {
     49 			r.FlagSet = append(r.FlagSet, USER_FOO)
     50 		} else {
     51 			r.FlagReset = append(r.FlagReset, USER_FOO)
     52 		}
     53 	case "do_bar":
     54 		if f.st.MatchFlag(USER_BAR, false) {
     55 			r.FlagSet = append(r.FlagSet, USER_BAR)
     56 		} else {
     57 			r.FlagReset = append(r.FlagReset, USER_BAR)
     58 		}
     59 	case "do_baz":
     60 		if f.st.MatchFlag(USER_BAZ, false) {
     61 			r.FlagSet = append(r.FlagSet, USER_BAZ)
     62 		} else {
     63 			r.FlagReset = append(r.FlagReset, USER_BAZ)
     64 		}
     65 	}
     66 	return r, nil
     67 }
     68 
     69 func main() {
     70 	root := "root"
     71 	fmt.Fprintf(os.Stderr, "starting session at symbol '%s' using resource dir: %s\n", root, scriptDir)
     72 
     73 	ctx := context.Background()
     74 	st := state.NewState(3)
     75 	store := fsdb.NewFsDb()
     76 	err := store.Connect(ctx, scriptDir)
     77 	if err != nil {
     78 		panic(err)
     79 	}
     80 	rs := resource.NewDbResource(store)
     81 	cfg := engine.Config{
     82 		Root: "root",
     83 	}
     84 
     85 	aux := &flagResource{st: st}
     86 	rs.AddLocalFunc("do_foo", aux.do)
     87 	rs.AddLocalFunc("do_bar", aux.do)
     88 	rs.AddLocalFunc("do_baz", aux.do)
     89 	rs.AddLocalFunc("states", aux.get)
     90 
     91 	state.FlagDebugger.Register(USER_FOO, "FOO")
     92 	state.FlagDebugger.Register(USER_BAR, "BAR")
     93 	state.FlagDebugger.Register(USER_BAZ, "BAZ")
     94 
     95 	en := engine.NewEngine(cfg, rs)
     96 	en = en.WithState(st)
     97 	en = en.WithDebug(nil)
     98 	err = engine.Loop(ctx, en, os.Stdin, os.Stdout, nil)
     99 	if err != nil {
    100 		fmt.Fprintf(os.Stderr, "loop exited with error: %v\n", err)
    101 		os.Exit(1)
    102 	}
    103 }