org.teavm.codegen.DefaultNamingStrategy Maven / Gradle / Ivy

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TeaVM compiler and SPI
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/*
 *  Copyright 2011 Alexey Andreev.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.teavm.codegen;

import java.util.HashMap;
import java.util.Map;
import org.teavm.model.*;

/**
 *
 * @author Alexey Andreev
 */
public class DefaultNamingStrategy implements NamingStrategy {
    private AliasProvider aliasProvider;
    private ClassReaderSource classSource;
    private Map aliases = new HashMap<>();
    private Map privateAliases = new HashMap<>();
    private Map classAliases = new HashMap<>();
    private Map fieldAliases = new HashMap<>();
    private Map functionAliases = new HashMap<>();
    private boolean minifying;

    public DefaultNamingStrategy(AliasProvider aliasProvider, ClassReaderSource classSource) {
        this.aliasProvider = aliasProvider;
        this.classSource = classSource;
    }

    public boolean isMinifying() {
        return minifying;
    }

    public void setMinifying(boolean minifying) {
        this.minifying = minifying;
    }

    @Override
    public String getNameFor(String cls) {
        String name = classAliases.get(cls);
        if (name == null) {
            name = aliasProvider.getAlias(cls);
            classAliases.put(cls, name);
        }
        return name;
    }

    @Override
    public String getNameFor(MethodDescriptor method) {
        return getNameFor(method, 'M');
    }

    private String getNameFor(MethodDescriptor method, char classifier) {
        String key = classifier + method.toString();
        String alias = aliases.get(key);
        if (alias == null) {
            alias = aliasProvider.getAlias(method);
            aliases.put(key, alias);
        }
        return alias;
    }

    @Override
    public String getFullNameFor(MethodReference method) throws NamingException {
        return getFullNameFor(method, 'M');
    }

    @Override
    public String getNameForInit(MethodReference method) throws NamingException {
        return getFullNameFor(method, 'I');
    }

    private String getFullNameFor(MethodReference method, char classifier) throws NamingException {
        MethodReference originalMethod = method;
        method = getRealMethod(method);
        if (method == null) {
            throw new NamingException("Can't provide name for method as it was not found: " + originalMethod);
        }
        if (!minifying) {
            return getNameFor(method.getClassName()) + "_" + getNameFor(method.getDescriptor(), classifier);
        }
        String key = classifier + method.toString();
        String alias = privateAliases.get(key);
        if (alias == null) {
            alias = aliasProvider.getAlias(method);
            privateAliases.put(key, alias);
        }
        return alias;
    }

    @Override
    public String getNameFor(FieldReference field) {
        String realCls = getRealFieldOwner(field.getClassName(), field.getFieldName());
        if (!realCls.equals(field.getClassName())) {
            String alias = getNameFor(new FieldReference(realCls, field.getFieldName()));
            fieldAliases.put(field.getClassName() + "#" + field, alias);
            return alias;
        } else {
            String key = realCls + "#" + field;
            String alias = fieldAliases.get(key);
            if (alias == null) {
                alias = aliasProvider.getAlias(field);
                fieldAliases.put(key, alias);
            }
            return alias;
        }
    }

    @Override
    public String getNameForFunction(String name) throws NamingException {
        if (!minifying) {
            return name;
        }
        String alias = functionAliases.get(name);
        if (alias == null) {
            alias = aliasProvider.getFunctionAlias(name);
            functionAliases.put(name, alias);
        }
        return alias;
    }

    private MethodReference getRealMethod(MethodReference methodRef) {
        String className = methodRef.getClassName();
        while (className != null) {
            ClassReader cls = classSource.get(className);
            if (cls == null) {
                return null;
            }
            MethodReader method = cls.getMethod(methodRef.getDescriptor());
            if (method != null) {
                if (method.getLevel() == AccessLevel.PRIVATE && !className.equals(methodRef.getClassName())) {
                    return null;
                }
                return new MethodReference(className, method.getDescriptor());
            }
            className = cls.getParent();
        }
        return null;
    }

    private String getRealFieldOwner(String cls, String field) {
        String initialCls = cls;
        while (!fieldExists(cls, field)) {
            ClassReader clsHolder = classSource.get(cls);
            cls = clsHolder.getParent();
            if (cls == null) {
                throw new NamingException("Can't provide name for field as the field not found: " +
                        initialCls + "." + field);
            }
        }
        return cls;
    }

    private boolean fieldExists(String cls, String field) {
        ClassReader classHolder = classSource.get(cls);
        return classHolder.getField(field) != null;
    }
}