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package com.oracle.truffle.js.nodes.cast;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.object.DynamicObject;
import com.oracle.truffle.js.nodes.CompileRegexNode;
import com.oracle.truffle.js.nodes.JavaScriptBaseNode;
import com.oracle.truffle.js.nodes.intl.CreateRegExpNode;
import com.oracle.truffle.js.runtime.JSContext;

Implements a cast from an value to a RegExp Object, as defined by String.prototype.match and
String.prototype.search.
/**
 * Implements a cast from an value to a RegExp Object, as defined by String.prototype.match and
 * String.prototype.search.
 */
public abstract class JSToRegExpNode extends JavaScriptBaseNode {
    protected final JSContext context;
    @Child private CreateRegExpNode createRegExpNode;

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

    public abstract DynamicObject execute(Object target);

    public static JSToRegExpNode create(JSContext context) {
        return JSToRegExpNodeGen.create(context);
    }

    @Specialization(guards = "isJSRegExp(regExp)")
    protected DynamicObject returnRegExp(DynamicObject regExp) {
        return regExp;
    }

    @Specialization(guards = "!isJSRegExp(patternObj)")
    protected DynamicObject createRegExp(Object patternObj,
                    @Cached("createUndefinedToEmpty()") JSToStringNode toStringNode,
                    @Cached("create(context)") CompileRegexNode compileRegexNode) {
        String pattern = toStringNode.executeString(patternObj);
        Object regex = compileRegexNode.compile(pattern);
        return getCreateRegExpNode().createRegExp(regex);
    }

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