99 lines
2.4 KiB
Java
99 lines
2.4 KiB
Java
package 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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import static lox.TokenType.EOF;
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public class Lox {
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private static final Interpreter interpreter = new Interpreter();
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static boolean hadError = false;
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static boolean hadRuntimeError = 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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// whoops
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if (hadError) {
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System.exit(65);
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}
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if (hadRuntimeError) {
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System.exit(70);
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}
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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) {
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break;
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}
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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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Parser parser = new Parser(tokens);
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List<Stmt> statements = parser.parse();
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if (hadError) {
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return;
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}
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Resolver resolver = new Resolver(interpreter);
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resolver.resolve(statements);
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if (hadError) {
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return;
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}
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interpreter.interpret(statements);
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}
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static void error(int line, String message) {
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report(line, "", message);
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}
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static void runtimeError(RuntimeError error) {
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System.err.println(error.getMessage() + "\n[line " + error.token.line + "]");
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hadRuntimeError = true;
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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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static void error(Token token, String message) {
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if (token.type == EOF) {
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report(token.line, " at end", message);
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} else {
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report(token.line, " at '" + token.lexeme + "'", message);
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}
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}
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}
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