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// Copyright 2017 The Bazel Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// The starlark command interprets a Starlark file.
// With no arguments, it starts a read-eval-print loop (REPL).
package main // import "go.starlark.net/cmd/starlark"
import (
"flag"
"fmt"
"log"
"os"
"runtime/pprof"
"sort"
"strings"
"go.starlark.net/repl"
"go.starlark.net/resolve"
"go.starlark.net/starlark"
)
// flags
var (
cpuprofile = flag.String("cpuprofile", "", "gather CPU profile in this file")
showenv = flag.Bool("showenv", false, "on success, print final global environment")
)
// non-standard dialect flags
func init() {
flag.BoolVar(&resolve.AllowFloat, "fp", resolve.AllowFloat, "allow floating-point numbers")
flag.BoolVar(&resolve.AllowSet, "set", resolve.AllowSet, "allow set data type")
flag.BoolVar(&resolve.AllowLambda, "lambda", resolve.AllowLambda, "allow lambda expressions")
flag.BoolVar(&resolve.AllowNestedDef, "nesteddef", resolve.AllowNestedDef, "allow nested def statements")
flag.BoolVar(&resolve.AllowBitwise, "bitwise", resolve.AllowBitwise, "allow bitwise operations (&, |, ^, ~, <<, and >>)")
flag.BoolVar(&resolve.AllowRecursion, "recursion", resolve.AllowRecursion, "allow while statements and recursive functions")
}
func main() {
log.SetPrefix("starlark: ")
log.SetFlags(0)
flag.Parse()
if *cpuprofile != "" {
f, err := os.Create(*cpuprofile)
if err != nil {
log.Fatal(err)
}
if err := pprof.StartCPUProfile(f); err != nil {
log.Fatal(err)
}
defer pprof.StopCPUProfile()
}
thread := &starlark.Thread{Load: repl.MakeLoad()}
globals := make(starlark.StringDict)
switch len(flag.Args()) {
case 0:
fmt.Println("Welcome to Starlark (go.starlark.net)")
repl.REPL(thread, globals)
case 1:
// Execute specified file.
filename := flag.Args()[0]
var err error
globals, err = starlark.ExecFile(thread, filename, nil, nil)
if err != nil {
repl.PrintError(err)
os.Exit(1)
}
default:
log.Fatal("want at most one Starlark file name")
}
// Print the global environment.
if *showenv {
var names []string
for name := range globals {
if !strings.HasPrefix(name, "_") {
names = append(names, name)
}
}
sort.Strings(names)
for _, name := range names {
fmt.Fprintf(os.Stderr, "%s = %s\n", name, globals[name])
}
}
}
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