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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * person obtaining a copy of this software, associated documentation and/or
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package com.oracle.truffle.regex;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.interop.InteropException;
import com.oracle.truffle.api.interop.InteropLibrary;
import com.oracle.truffle.api.interop.TruffleObject;

/**
 * {@link ForeignRegexCompiler} wraps a {@link TruffleObject} that is compatible with
 * {@link RegexCompiler} and lets us use it as if it were an actual {@link RegexCompiler}.
 *
 * @author Jirka Marsik 
 */
public class ForeignRegexCompiler implements RegexCompiler {

    private final TruffleObject foreignCompiler;

    public ForeignRegexCompiler(TruffleObject foreignCompiler) {
        this.foreignCompiler = foreignCompiler;
    }

    /**
     * Wraps the supplied {@link TruffleObject} in a {@link ForeignRegexCompiler}, unless it already
     * is a {@link RegexCompiler}. Use this when accepting {@link RegexCompiler}s over Truffle
     * interop.
     */
    public static RegexCompiler importRegexCompiler(TruffleObject regexCompiler) {
        return regexCompiler instanceof RegexCompiler ? (RegexCompiler) regexCompiler : new ForeignRegexCompiler(regexCompiler);
    }

    @TruffleBoundary
    @Override
    public TruffleObject compile(RegexSource source) throws RegexSyntaxException, UnsupportedRegexException {
        try {
            return (TruffleObject) InteropLibrary.getFactory().getUncached().execute(foreignCompiler, source.getPattern(), source.getFlags());
        } catch (InteropException ex) {
            throw new RuntimeException(ex);
        }
    }
}