Nesting RegexCompleters only completes first word

[maxbechtold]

I'm having trouble getting nested RegexCompleters to work even though I've read nothing that speaks against it. Here's a reproduction example, I'm using JLine 3.26.3 on Windows 10, JDK 17. The LineReader options don't seem to make a difference.

Initially, Tab completes the line to "Word-A", but following this there's no further suggestion/candidate, although the grammar "a b" implies "Word-B" as the only viable text to follow.

What am I missing?

import org.jline.builtins.Completers;
import org.jline.reader.Completer;
import org.jline.reader.LineReader;
import org.jline.reader.LineReaderBuilder;
import org.jline.reader.impl.completer.StringsCompleter;
import org.jline.terminal.Terminal;
import org.jline.terminal.TerminalBuilder;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class Main {

    public static void main(String[] args) throws IOException {
        Terminal terminal = TerminalBuilder.builder()
            .system(true)
            .build();

        LineReader lineReader = LineReaderBuilder.builder()
            .terminal(terminal)
            .option(LineReader.Option.CASE_INSENSITIVE, true)
            .option(LineReader.Option.DISABLE_EVENT_EXPANSION, true)
            .completer(buildCompleter())
            .build();
        lineReader.readLine();
    }

    private static Completer buildCompleter() {
        Map<String, Completer> map = new HashMap<>();
        map.put("0", new Completers.RegexCompleter("a b", s -> {
            if ("a".equals(s)) {
                return new StringsCompleter("Word-A");
            }
            return new StringsCompleter("Word-B");
        }));
        return new Completers.RegexCompleter("0", map::get);
    }

}

[maxbechtold]

One more note, my intent is to split a command system of about 30 commands into separate RegexCompleters. But I guess just chaining all in a long <C1-syntax> | <C2-syntax> |... <C30-syntax> syntax for a single RegexCompleter is also feasible

[gnodet]

@maxbechtold I'm not sure exactly why your example does not work, but here's a working one: https://github.com/jline/jline3/blob/4ccf282c91daa0fc96ed6030e053dd28a4aba342/builtins/src/test/java/org/jline/example/Example.java#L328-L335

The fact that you're using 2 regex completers seems problematic.

[gnodet]

One more note, my intent is to split a command system of about 30 commands into separate RegexCompleters. But I guess just chaining all in a long <C1-syntax> | <C2-syntax> |... <C30-syntax> syntax for a single RegexCompleter is also feasible

You should try the TreeCompleter which is more user friendly than the RegexCompleter, it actually uses it underneath, but the tree structure makes it easier to deal with.