66 lines
2.1 KiB
Java
66 lines
2.1 KiB
Java
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/*
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* Name: Mike Cifelli
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* Course: CIS 443 - Programming Languages
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* Assignment: Lisp Parser
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*/
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package main;
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import parser.*;
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import error.ErrorManager;
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import java.io.*;
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/**
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* <code>LispParserDriver</code> is a program that takes the name of a file
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* as a command-line argument, creates an internal representation of the
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* S-expressions found in the file and prints them to the console. If no file
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* name is provided at the command-line, this program will read from standard
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* input.
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*/
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public class LispParserDriver {
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/**
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* Create internal representations of the S-expressions found in the file
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* whose name was given as a command-line argument and print them to the
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* console. If no file name was given, retrieve the S-expressions from
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* standard input.
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*
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* @param args
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* the command-line arguments:
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* <ul>
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* <li><code>args[0]</code> - file name (optional)</li>
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* </ul>
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*/
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public static void main(String[] args) {
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LispParser parser = null;
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if (args.length > 0) {
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// a file name was given at the command-line, attempt to create a
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// 'LispParser' on it
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try {
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parser = new LispParser(new FileInputStream(args[0]), args[0]);
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} catch (FileNotFoundException e) {
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ErrorManager.generateError(e.getMessage(),
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ErrorManager.CRITICAL_LEVEL);
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}
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} else {
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// no file name was given, create a 'LispParser' on standard input
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parser = new LispParser(System.in, "System.in");
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}
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while (! parser.eof()) {
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try {
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SExpression sexpr = parser.getSExpr();
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System.out.println(sexpr.toString());
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} catch (RuntimeException e) {
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ErrorManager.generateError(e.getMessage(), 2);
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} catch (IOException e) {
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ErrorManager.generateError(e.getMessage(),
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ErrorManager.CRITICAL_LEVEL);
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}
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}
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}
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}
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