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|
package main
import (
"fmt"
"strings"
)
import (
"printer"
"reader"
"readline"
. "types"
)
// read
func READ(str string) (MalType, error) {
return reader.Read_str(str)
}
// eval
func EVAL(ast MalType, env string) (MalType, error) {
return ast, nil
}
// print
func PRINT(exp MalType) (string, error) {
return printer.Pr_str(exp, true), nil
}
// repl
func rep(str string) (MalType, error) {
var exp MalType
var res string
var e error
if exp, e = READ(str); e != nil {
return nil, e
}
if exp, e = EVAL(exp, ""); e != nil {
return nil, e
}
if res, e = PRINT(exp); e != nil {
return nil, e
}
return res, nil
}
func main() {
// repl loop
for {
text, err := readline.Readline("user> ")
text = strings.TrimRight(text, "\n")
if err != nil {
return
}
var out MalType
var e error
if out, e = rep(text); e != nil {
if e.Error() == "<empty line>" {
continue
}
fmt.Printf("Error: %v\n", e)
continue
}
fmt.Printf("%v\n", out)
}
}
|
