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120 lines
1.9 KiB
Go

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package main
import (
"encoding/json"
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"flag"
"fmt"
"io"
"os"
)
func input(n int) io.ReadCloser {
if flag.Arg(n) == "" {
return os.Stdin
} else {
f, err := os.Open(flag.Arg(n))
if err != nil {
bail(1, "input error: %s", err)
}
return f
}
}
func check() {
r := input(1)
defer r.Close()
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_, err := parse(r)
if err != nil {
bail(1, "parse error: %s", err)
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}
}
func lexx() {
r := input(1)
defer r.Close()
c := lex(r)
for t := range c {
fmt.Println(t)
}
}
func parsse() {
r := input(1)
defer r.Close()
n, err := parse(r)
if err != nil {
bail(1, "parse error: %s", err)
}
if err := n.pretty(os.Stdout, ""); err != nil {
bail(1, "output error: %s", err)
}
}
func eval(r io.Reader) (map[string]interface{}, error) {
n, err := parse(r)
if err != nil {
return nil, fmt.Errorf("parse error: %s\n", err)
}
ctx := make(map[string]interface{})
if err := n.eval(ctx); err != nil {
return nil, fmt.Errorf("eval error: %s\n", err)
}
return ctx, nil
}
func to() {
switch flag.Arg(1) {
case "json":
to_json(2)
default:
fmt.Fprintf(os.Stderr, "%s is not a valid output format\n", flag.Arg(1))
fmt.Fprintln(os.Stderr, "valid output formats: json")
os.Exit(1)
}
}
func to_json(n int) {
v, err := eval(input(n))
if err != nil {
bail(1, "input error: %s", err)
}
b, err := json.MarshalIndent(v, "", " ")
if err != nil {
bail(1, "encode error: %s", err)
}
os.Stdout.Write(b)
}
func bail(status int, t string, args ...interface{}) {
var w io.Writer
if status == 0 {
w = os.Stdout
} else {
w = os.Stderr
}
fmt.Fprintf(w, t+"\n", args...)
os.Exit(status)
}
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func main() {
flag.Parse()
switch flag.Arg(0) {
case "check":
check()
case "lex":
lexx()
case "parse":
parsse()
case "to":
to()
case "":
bail(1, "must specify an action.\nvalid actions: check lex parse to")
default:
bail(1, "no such action:%s", flag.Arg(0))
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}
}