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https://github.com/aNNiMON/Own-Programming-Language-Tutorial.git
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В REPL добавлен вывод функций, переменных и всего исходника
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Victor
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commit
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@ -1,6 +1,5 @@
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package com.annimon.ownlang;
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import com.annimon.ownlang.exceptions.LexerException;
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import com.annimon.ownlang.exceptions.StoppedException;
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import com.annimon.ownlang.parser.Beautifier;
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import com.annimon.ownlang.parser.Lexer;
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@ -11,10 +10,10 @@ import com.annimon.ownlang.parser.SourceLoader;
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import com.annimon.ownlang.parser.Token;
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import com.annimon.ownlang.parser.ast.Statement;
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import com.annimon.ownlang.parser.visitors.FunctionAdder;
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import com.annimon.ownlang.utils.Repl;
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import com.annimon.ownlang.utils.TimeMeasurement;
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import java.io.IOException;
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import java.util.List;
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import java.util.Scanner;
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import java.util.concurrent.TimeUnit;
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/**
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@ -22,7 +21,7 @@ import java.util.concurrent.TimeUnit;
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*/
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public final class Main {
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private static final String VERSION = "1.2.0";
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public static final String VERSION = "1.2.0";
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private static String[] ownlangArgs = new String[0];
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@ -97,7 +96,7 @@ public final class Main {
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case "-r":
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case "--repl":
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repl();
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Repl.main(new String[0]);
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return;
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case "-l":
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@ -193,46 +192,6 @@ public final class Main {
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}
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}
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private static void repl() {
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final StringBuilder buffer = new StringBuilder();
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final Scanner scanner = new Scanner(System.in);
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System.out.println("Welcome to OwnLang " + VERSION + " REPL\n"
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+ "Type in expressions to have them evaluated.\n"
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+ "Type :reset to clear buffer.\n"
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+ "Type :exit to exit REPL.");
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while (true) {
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System.out.print((buffer.length() == 0) ? "\n> " : " ");
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if (!scanner.hasNextLine()) break;
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final String line = scanner.nextLine();
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if (":exit".equalsIgnoreCase(line)) break;
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if (":reset".equalsIgnoreCase(line)) {
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buffer.setLength(0);
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continue;
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}
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buffer.append(line).append(System.lineSeparator());
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try {
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final List<Token> tokens = Lexer.tokenize(buffer.toString());
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final Parser parser = new Parser(tokens);
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final Statement program = parser.parse();
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if (parser.getParseErrors().hasErrors()) {
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continue;
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}
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program.execute();
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} catch (LexerException lex) {
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continue;
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} catch (StoppedException ex) {
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// skip
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} catch (Exception ex) {
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Console.handleException(Thread.currentThread(), ex);
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}
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buffer.setLength(0);
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}
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scanner.close();
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}
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private static class Options {
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boolean showTokens, showAst, showMeasurements;
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boolean lintMode;
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140
src/main/java/com/annimon/ownlang/utils/Repl.java
Normal file
140
src/main/java/com/annimon/ownlang/utils/Repl.java
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@ -0,0 +1,140 @@
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package com.annimon.ownlang.utils;
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import com.annimon.ownlang.Console;
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import com.annimon.ownlang.Main;
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import com.annimon.ownlang.exceptions.LexerException;
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import com.annimon.ownlang.exceptions.StoppedException;
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import com.annimon.ownlang.lib.Functions;
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import com.annimon.ownlang.lib.UserDefinedFunction;
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import com.annimon.ownlang.lib.Variables;
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import com.annimon.ownlang.parser.Lexer;
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import com.annimon.ownlang.parser.Parser;
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import com.annimon.ownlang.parser.Token;
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import com.annimon.ownlang.parser.ast.BlockStatement;
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import com.annimon.ownlang.parser.ast.Statement;
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import com.annimon.ownlang.parser.visitors.PrintVisitor;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Locale;
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import java.util.Map;
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import java.util.Scanner;
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import java.util.stream.Collectors;
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public final class Repl {
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private static final String
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HELP = ":help",
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VARS = ":vars",
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FUNCS = ":funcs",
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SOURCE = ":source",
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RESET = ":reset",
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EXIT = ":exit";
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public static void main(String[] args) {
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System.out.println("Welcome to OwnLang " + Main.VERSION + " REPL");
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printHelp(false);
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final BlockStatement history = new BlockStatement();
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final StringBuilder buffer = new StringBuilder();
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final Scanner scanner = new Scanner(System.in);
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while (true) {
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System.out.print((buffer.length() == 0) ? "\n> " : " ");
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if (!scanner.hasNextLine()) break;
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final String line = scanner.nextLine();
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if (EXIT.equalsIgnoreCase(line)) break;
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switch (line.toLowerCase(Locale.ENGLISH)) {
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case RESET:
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buffer.setLength(0);
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continue;
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case HELP:
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printHelp(true);
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continue;
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case VARS:
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printVariables();
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continue;
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case FUNCS:
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printFunctions();
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continue;
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case SOURCE:
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System.out.println(history.accept(new PrintVisitor(), new StringBuilder()));
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continue;
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}
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buffer.append(line).append(System.lineSeparator());
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Statement program = null;
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try {
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final List<Token> tokens = Lexer.tokenize(buffer.toString());
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final Parser parser = new Parser(tokens);
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program = parser.parse();
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if (parser.getParseErrors().hasErrors()) {
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continue;
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}
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program.execute();
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} catch (LexerException lex) {
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continue;
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} catch (StoppedException ex) {
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// skip
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} catch (Exception ex) {
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Console.handleException(Thread.currentThread(), ex);
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}
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if (program != null) {
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history.add(program);
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}
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buffer.setLength(0);
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}
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scanner.close();
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}
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private static void printHelp(boolean full) {
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System.out.println("Type in expressions to have them evaluated.");
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final List<String> commands = new ArrayList<>();
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if (full) {
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commands.add(VARS + " - listing variables");
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commands.add(FUNCS + " - listing functions");
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commands.add(SOURCE + " - listing source");
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}
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commands.add(HELP + " - show help");
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commands.add(RESET + " - clear buffer");
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commands.add(EXIT + " - exit REPL");
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int maxLength = commands.stream()
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.mapToInt(String::length)
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.max().getAsInt();
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final int maxCols = 2;
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final int size = commands.size();
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for (int i = 0; i < size; i += maxCols) {
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// Pad to max length and print in tab-separatex maxCols columns
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System.out.println(commands
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.subList(i, Math.min(size, i + maxCols))
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.stream()
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.map(str -> String.format("%-" + maxLength + "s", str))
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.collect(Collectors.joining("\t", " ", ""))
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);
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}
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}
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private static void printVariables() {
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Variables.variables().entrySet().stream()
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.sorted(Map.Entry.comparingByKey())
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.forEach(e -> System.out.printf("\t%s = %s%n",
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e.getKey(), e.getValue().toString()));
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}
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private static void printFunctions() {
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System.out.println("User functions:");
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Functions.getFunctions().entrySet().stream()
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.filter(p -> p.getValue() instanceof UserDefinedFunction)
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.sorted(Map.Entry.comparingByKey())
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.forEach(e -> System.out.printf("\t%s%s%n",
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e.getKey(), ((UserDefinedFunction)e.getValue()).arguments));
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System.out.println("Library functions:");
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Functions.getFunctions().entrySet().stream()
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.filter(p -> !(p.getValue() instanceof UserDefinedFunction))
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.sorted(Map.Entry.comparingByKey())
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.forEach(e -> System.out.printf("\t%s%n", e.getKey()));
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}
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}
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