65 lines
1.8 KiB
Java
65 lines
1.8 KiB
Java
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package com.craftinginterpreters.lox;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.nio.charset.Charset;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.List;
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public class Lox {
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private static boolean hadError = false;
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public static void main(String[] args) throws IOException {
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if (args.length > 1) {
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System.out.println("Usage: jlox [script]");
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System.exit(64);
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} else if (args.length == 1) {
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runFile(args[0]);
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} else {
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runPrompt();
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}
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}
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private static void runFile(String path) throws IOException {
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byte[] bytes = Files.readAllBytes(Paths.get(path));
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run(new String(bytes, Charset.defaultCharset()));
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// Indicate an error in the exit code.
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if (hadError) System.exit(65);
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}
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private static void runPrompt() throws IOException {
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InputStreamReader input = new InputStreamReader(System.in);
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BufferedReader reader = new BufferedReader(input);
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for (;;) {
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System.out.print("> ");
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String line = reader.readLine();
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if (line == null) break;
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run(line);
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hadError = false;
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}
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}
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private static void run(String source) {
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Scanner scanner = new Scanner(source);
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List<Token> tokens = scanner.scanTokens();
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// For now, just print the tokens.
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for (Token token : tokens) {
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System.out.println(token);
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}
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}
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public static void error(int line, String message) {
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report(line, "", message);
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}
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private static void report(int line, String where, String message) {
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System.err.println("[line " + line + "] Error" + where + ": " + message);
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hadError = true;
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}
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}
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