source: main/trunk/greenstone3/src/java/org/greenstone/gsdl3/util/GS2MacroResolver.java@ 25635

/*
 *    GS2MacroResolver.java
 *    Copyright (C) 2005 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.greenstone.gsdl3.util;

import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.net.URLDecoder;

// Apache Commons
import org.apache.commons.lang3.*;
import org.greenstone.gsdl3.util.MacroResolver.Macro;

import java.util.Stack;

public class GS2MacroResolver 
    extends MacroResolver
{

    protected SimpleCollectionDatabase coll_db = null;

    private static Pattern p_back_slash = Pattern.compile("\\\"");// create a pattern "\\\"", but it matches both " and \"
    
    // need to make it not add macros if they are already present
    public GS2MacroResolver(SimpleCollectionDatabase db) {
    super();
    coll_db = db;
    }

    public GS2MacroResolver() {
    super();
    }

    public void setDB(SimpleCollectionDatabase db) {
    this.coll_db = db;
    }

    
    public String resolve(String text, String lang, String scope, 
              String doc_oid) {
    if (text == null || text.equals("")) return text;
    if (scope.equals(SCOPE_TEXT) && text_macros.size()==0) return text;
    if (scope.equals(SCOPE_META) && metadata_macros.size() ==0) return text;
    DBInfo node_info = null;
    DBInfo root_info = null;
    boolean new_lang = false;
    if (this.lang == null || !this.lang.equals(lang) ) {
        new_lang = true;
        this.lang = lang;
    } 

    Stack<Macro> macros = new Stack<Macro>();//ArrayList macros;
    if (scope.equals(SCOPE_TEXT)) {
        macros.addAll(text_macros);
    } else {
        macros.addAll(metadata_macros);
    }
    //for (int i=0; i<macros.size(); i++) {
    while(!macros.empty()) {
        String new_text = null;
        Macro m = macros.pop();//.get(i);
        switch (m.type) {
        case TYPE_DICT:
        if (m.text==null || new_lang) {
            Dictionary dict = new Dictionary(m.bundle, lang);
            m.text = dict.get(m.key, null);
        }
        // we assume that dictionary entries will contain no macros
        // otherwise we can't cache the answer because it might be 
        // document specific
        text = StringUtils.replace(text, m.macro, m.text);
        break;
        case TYPE_TEXT:
        // make sure we resolve any macros in the text
        // the (?s) treats the string as a single line, cos . 
        // doesn't necessarily match line breaks
        //if (text.matches("(?s).*"+m.macro+".*")) {
        
        /*Pattern p_text = Pattern.compile(".*" + m.macro + ".*",Pattern.DOTALL);
        Matcher match_text = p_text.matcher(text);*/

        // sm252
        // String.contains is far faster than regex!
        if (text.contains(m.macro)) { //match_text.matches()) { //text.matches("(?s).*"+m.macro+".*")) {
            if (m.resolve) {
            new_text = this.resolve(m.text, lang, scope, doc_oid);
            } else {
            new_text = m.text;
            }
            text = StringUtils.replace(text, m.macro, new_text);
            if (m.macro.endsWith("\\\\")){ // to get rid of "\" from the string likes: "src="http://www.greenstone.org:80/.../mw.gif\">"
            
            Matcher m_slash = p_back_slash.matcher(text);
            String clean_str = "";
            int s=0;
            while (m_slash.find()){
                if (!text.substring(m_slash.end()-2,m_slash.end()-1).equals("\\")){
                clean_str = clean_str + text.substring(s,m_slash.end()-1); // it matches ", so get a substring before "
                }else{
                clean_str = clean_str + text.substring(s,m_slash.end()-2);// it matches \", so get a substring before \
                }
                s = m_slash.end();// get the index of the last match
                clean_str = clean_str + "\"";
            }
            text = clean_str + text.substring(s,text.length());
            }
        }
        break;
        case TYPE_META:
        //Pattern p = Pattern.compile(".*" + m.macro + ".*",Pattern.DOTALL);
        //Matcher match = p.matcher(text);
        // sm252
        if (text.contains(m.macro)) { //(match.matches()) { //text.matches("(?s).*"+m.macro+".*")) {
            if (node_info == null) {
            node_info = coll_db.getInfo(doc_oid);
            if (node_info == null) {
                break;
            }
            }
            new_text = node_info.getInfo(m.text);
            if (new_text == null || new_text.equals("")) {
            // try the root node
            if (root_info == null && !OID.isTop(doc_oid)) {
                root_info = coll_db.getInfo(OID.getTop(doc_oid));
            }
            if (root_info == null) break;
            new_text = root_info.getInfo(m.text);
            }
            if (new_text != null) {
            if (m.resolve) {
                new_text = this.resolve(new_text, lang, scope, doc_oid);
            }
            text =  StringUtils.replace(text, m.macro, new_text);
            }
            
        }
        
        break;
        } // switch
       
    }
    return text;
    
    }

}