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yabl.go
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/
yabl.go
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package main
import (
"bufio"
"fmt"
"github.com/knarka/yabl/interpreter"
"io/ioutil"
"log"
"os"
"regexp"
)
func usage() {
log.Fatal("usage: yabl [filename]")
}
func getFileContents(fn string) string {
if _, err := os.Stat(fn); err != nil {
log.Println("error: could not find file " + fn)
usage()
}
file, err := os.Open(fn)
if err != nil {
log.Println("error: could not open file " + fn)
usage()
}
defer file.Close()
bytes, err := ioutil.ReadAll(file)
if err != nil {
log.Println("error: could not read file " + fn)
usage()
}
return string(bytes)
}
func repl() {
for {
reader := bufio.NewReader(os.Stdin)
fmt.Print("o` ")
code, _ := reader.ReadString('\n')
if regexp.MustCompile(`^\s+$`).Match([]byte(code)) {
continue
}
log.Println(interpreter.Interpret(code).Pretty())
}
}
func main() {
if len(os.Args) == 1 {
usage()
return
}
fn := os.Args[1]
if fn == "--repl" {
repl()
}
fmt.Println(interpreter.Interpret(getFileContents(fn)).Pretty())
}