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Non-Blocking Language Recognition
There is a newer version: 3.0.1
/**
 * Copyright 2015 Santhosh Kumar Tekuri
 *
 * The JLibs authors license this file to you 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 jlibs.nblr;

import jlibs.core.io.FileUtil;
import jlibs.core.lang.ImpossibleException;
import jlibs.nblr.actions.EventAction;
import jlibs.nblr.actions.PublishAction;
import jlibs.nblr.editor.serialize.SyntaxBinding;
import jlibs.nblr.editor.serialize.SyntaxDocument;
import jlibs.nblr.matchers.Matcher;
import jlibs.nblr.rules.Edge;
import jlibs.nblr.rules.Node;
import jlibs.nblr.rules.Rule;
import jlibs.xml.sax.binding.BindingHandler;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.stream.StreamResult;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.*;

/**
 * @author Santhosh Kumar T
 */
public class Syntax{
    public final Map matchers = new LinkedHashMap();
    public Matcher add(String name, Matcher matcher){
        matcher.name = name;
        matchers.put(name, matcher);
        return matcher;
    }

    public final Map rules = new LinkedHashMap();
    
    public Rule add(String name, Rule rule){
        rule.name = name;
        rules.put(name, rule);
        updateRuleIDs();        
        return rule;
    }
    
    public void delete(Rule rule){
        rules.remove(rule.name);
        updateRuleIDs();
    }
    
    public void updateRuleIDs(){
        int id = 0;
        for(Rule r: rules.values())
            r.id = id++;
    }

    public String ruleProtypeWidth(){
        String lengthyRuleName = "XXXXXXXXX";
        for(Rule rule: rules.values()){
            if(rule.name.length()>lengthyRuleName.length())
                lengthyRuleName = rule.name;
        }
        return lengthyRuleName;
    }

    public List usages(Rule rule){
        List usages = new ArrayList();
        for(Rule r: rules.values()){
            for(Edge edge: r.edges()){
                if(edge.ruleTarget!=null){
                    if(edge.ruleTarget.rule==rule && !usages.contains(r))
                        usages.add(r);
                }
            }
        }
        return usages;
    }

    public List primaryRules(){
        List primaryRules = new ArrayList(rules.values());
        for(Rule r: rules.values()){
            for(Edge edge: r.edges()){
                if(edge.ruleTarget!=null){
                    if(edge.ruleTarget.rule!=r && edge.ruleTarget.node()==edge.ruleTarget.rule.node)
                        primaryRules.remove(edge.ruleTarget.rule);
                }
            }
        }
        return primaryRules;
    }

    public void computeBufferingStates(){
        BufferingDepths depths = new BufferingDepths();
        for(Rule rule: primaryRules())
            depths.calculate(rule);
        List list = new ArrayList(rules.values());
        list.removeAll(depths.ruleMap.keySet());

        while(!list.isEmpty()){
            Rule rule = list.get(0);
            depths.calculate(rule);
            list = new ArrayList(rules.values());
            list.removeAll(depths.ruleMap.keySet());
        }
    }

    /*-------------------------------------------------[ Serialization ]---------------------------------------------------*/

    public void saveTo(File file) throws IOException{
        FileOutputStream fout = null;
        try{
            fout = new FileOutputStream(file);
            SyntaxDocument xml = new SyntaxDocument(new StreamResult(fout));
            xml.startDocument();
            xml.add(this);
            xml.endDocument();
        }catch(IOException ex){
            throw ex;
        }catch(Exception ex){
            throw new IOException(ex);
        }finally{
            try{
                if(fout!=null)
                    fout.close();
            }catch(IOException ex){
                ex.printStackTrace();
            }
        }
    }

    public static Syntax loadFrom(File file) throws IOException, SAXException, ParserConfigurationException{
        BindingHandler handler = new BindingHandler(SyntaxBinding.class);
        return (Syntax)handler.parse(new InputSource(new FileInputStream(file)));
    }

    public Syntax copy(){
        try{
            File tempFile = new File("temp/temp.syntax");
            FileUtil.mkdirs(tempFile.getParentFile());

            saveTo(tempFile);
            return Syntax.loadFrom(tempFile);
        }catch(Exception ex){
            throw new ImpossibleException(ex);
        }
    }

    /*-------------------------------------------------[ Actions ]---------------------------------------------------*/

    public Set publishMethods(){
        Set methods = new TreeSet();
        for(Rule rule: rules.values()){
            for(Node node: rule.nodes()){
                if(node.action instanceof PublishAction)
                    methods.add(((PublishAction)node.action).name);
            }
        }
        return methods;
    }

    public Set eventMethods(){
        Set methods = new TreeSet();
        for(Rule rule: rules.values()){
            for(Node node: rule.nodes()){
                if(node.action instanceof EventAction)
                    methods.add(((EventAction)node.action).name);
            }
        }
        return methods;
    }
}