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 * The Universal Permissive License (UPL), Version 1.0
 *
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 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
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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
 * one is included with the Software each a "Larger Work" to which the Software
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
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package com.oracle.truffle.js.nodes.access;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.instrumentation.Tag;
import com.oracle.truffle.js.nodes.JavaScriptNode;
import com.oracle.truffle.js.nodes.instrumentation.JSTags;
import com.oracle.truffle.js.nodes.instrumentation.JSTags.LiteralTag;
import com.oracle.truffle.js.nodes.intl.CreateRegExpNode;
import com.oracle.truffle.js.runtime.JSContext;
import com.oracle.truffle.js.runtime.RegexCompilerInterface;
import com.oracle.truffle.js.runtime.util.TRegexUtil;
import com.oracle.truffle.js.runtime.util.TRegexUtil.CompileRegexNode;

import java.util.Set;

public class RegExpLiteralNode extends JavaScriptNode {
    private final JSContext context;
    private final String pattern;
    private final String flags;

    @CompilationFinal private Object regex;

    @Child private CreateRegExpNode createRegExpNode;
    @Child private TRegexUtil.CompileRegexNode compileRegExpNode;

    @Override
    public boolean hasTag(Class<? extends Tag> tag) {
        if (tag == LiteralTag.class) {
            return true;
        } else {
            return super.hasTag(tag);
        }
    }

    @Override
    public Object getNodeObject() {
        return JSTags.createNodeObjectDescriptor(LiteralTag.TYPE, LiteralTag.Type.RegExpLiteral.name());
    }

    RegExpLiteralNode(JSContext context, String pattern, String flags) {
        this.context = context;
        this.pattern = pattern;
        this.flags = flags;
    }

    public static RegExpLiteralNode create(JSContext context, String pattern, String flags) {
        return new RegExpLiteralNode(context, pattern, flags);
    }

    @Override
    public Object execute(VirtualFrame frame) {
        if (regex == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            regex = RegexCompilerInterface.compile(pattern, flags, context, getCompileRegExpNode());
        }
        return getCreateRegExpNode().createRegExp(regex);
    }

    private CompileRegexNode getCompileRegExpNode() {
        if (compileRegExpNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            compileRegExpNode = insert(TRegexUtil.CompileRegexNode.create());
        }
        return compileRegExpNode;
    }

    private CreateRegExpNode getCreateRegExpNode() {
        if (createRegExpNode == null) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            createRegExpNode = insert(CreateRegExpNode.create(context));
        }
        return createRegExpNode;
    }

    @Override
    protected JavaScriptNode copyUninitialized(Set<Class<? extends Tag>> materializedTags) {
        return create(context, pattern, flags);
    }
}