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