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 * data (collectively the "Software"), free of charge and under any and all
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 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
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 * (a) the Software, and
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 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
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package com.oracle.truffle.js.nodes;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.ReportPolymorphism;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.js.runtime.JSConfig;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.RegexCompilerInterface;
import com.oracle.truffle.js.runtime.util.TRegexUtil;

@ImportStatic(JSConfig.class)
public abstract class CompileRegexNode extends JavaScriptBaseNode {

    @Child private TRegexUtil.CompileRegexNode executeCompilerNode = TRegexUtil.CompileRegexNode.create();
    private final JSContext context;

    protected CompileRegexNode(JSContext context) {
        this.context = context;
    }

    public static CompileRegexNode create(JSContext context) {
        return CompileRegexNodeGen.create(context);
    }

    public final Object compile(String pattern) {
        return compile(pattern, "");
    }

    public final Object compile(CharSequence pattern, String flags) {
        return executeCompile(pattern, flags);
    }

    protected abstract Object executeCompile(CharSequence pattern, String flags);

    @SuppressWarnings("unused")
    @Specialization(guards = {"stringEquals(pattern, cachedPattern)", "stringEquals(flags, cachedFlags)"}, limit = "MaxCompiledRegexCacheLength")
    protected Object getCached(String pattern, String flags,
                    @Cached("pattern") String cachedPattern,
                    @Cached("flags") String cachedFlags,
                    @Cached("doCompile(pattern, flags)") Object cachedCompiledRegex) {
        return cachedCompiledRegex;
    }

    protected static boolean stringEquals(String a, String b) {
        return a.equals(b);
    }

    @Specialization(guards = {"!TrimCompiledRegexCache"})
    protected Object doCompileNoTrimCache(String pattern, String flags) {
        // optional specialization that does not trim the cache
        return doCompile(pattern, flags);
    }

    @ReportPolymorphism.Megamorphic
    @Specialization(replaces = {"getCached"})
    protected Object doCompile(String pattern, String flags) {
        return RegexCompilerInterface.compile(pattern, flags, context, executeCompilerNode);
    }
}