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The latte-lang compiler project, which contains compiler and runtime required library.
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/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 KuiGang Wang
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package lt.compiler.semantic;

import lt.compiler.LineCol;
import lt.compiler.LtBug;
import lt.compiler.SyntaxException;
import lt.compiler.semantic.builtin.EnumValue;

import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Target;
import java.util.ArrayList;
import java.util.List;

/**
 * annotation definition
 */
public class SAnnoDef extends STypeDef {
        private final List annoFields = new ArrayList();
        private final List modifiers = new ArrayList();

        public SAnnoDef(LineCol lineCol) {
                super(lineCol);
        }

        public List annoFields() {
                return annoFields;
        }

        public List modifiers() {
                return modifiers;
        }

        public boolean canPresentOn(ElementType type) throws SyntaxException {
                String name = fullName();
                try {
                        Class cls = Class.forName(name);
                        Annotation[] annotations = cls.getAnnotations();
                        for (Annotation a : annotations) {
                                if (a instanceof Target) {
                                        Target target = (Target) a;
                                        ElementType[] types = target.value();
                                        for (ElementType t : types) {
                                                if (t.equals(type)) return true;
                                        }
                                        return false;
                                }
                        }
                        return true;
                } catch (ClassNotFoundException e) {
                        // annotation not compiled yet
                        // check manually
                        SAnno targetAnno = null;
                        for (SAnno anno : annos()) {
                                if (anno.type().fullName().equals(Target.class.getName())) {
                                        targetAnno = anno;
                                        break;
                                }
                        }
                        if (null == targetAnno) return true;
                        SAnnoField valueAnnoF = null;
                        for (SAnnoField f : targetAnno.type().annoFields()) {
                                if (f.name().equals("value")) {
                                        valueAnnoF = f;
                                        break;
                                }
                        }
                        if (valueAnnoF == null) throw new LtBug("it should not be null");
                        SArrayValue arrV = (SArrayValue) targetAnno.values().get(valueAnnoF);
                        for (Value v : arrV.values()) {
                                if (v instanceof EnumValue && v.type().fullName().equals(ElementType.class.getName())) {
                                        if (type.name().equals(((EnumValue) v).enumStr())) return true;
                                }
                        }
                        return false;
                }
        }

        @Override
        public String toString() {
                return "@" + fullName();
        }
}