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40 lines
715 B
Scala
40 lines
715 B
Scala
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import reader.tokenize
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object step1_read_print {
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// read
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def READ(str: String): Any = {
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reader.read_str(str)
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}
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// eval
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def EVAL(ast: Any, env: String): Any = {
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ast
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}
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// print
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def PRINT(exp: Any): String = {
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printer._pr_str(exp, true)
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}
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// repl
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def main(args: Array[String]) = {
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val REP = (str: String) => {
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PRINT(EVAL(READ(str), ""))
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}
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var line:String = null
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while ({line = readLine("user> "); line != null}) {
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try {
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println(REP(line))
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} catch {
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case e : Exception => {
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println("Error: " + e.getMessage)
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println(" " + e.getStackTrace.mkString("\n "))
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}
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}
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}
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}
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}
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// vim: ts=2:sw=2
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