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// Modified or written by Object Mentor, Inc. for inclusion with FitNesse.
// Copyright (c) 2002 Cunningham & Cunningham, Inc.
// Released under the terms of the GNU General Public License version 2 or later.
package fit;

// Copyright (c) 2002 Cunningham & Cunningham, Inc.
// Released under the terms of the GNU General Public License version 2 or later.

import java.io.PrintWriter;

import fit.exception.FitParseException;

public class Parse {

  public String leader;
  public String tag;
  public String body;
  public String end;
  public String trailer;

  public Parse more;
  public Parse parts;

  public Parse(String tag, String body, Parse parts, Parse more) {
    this.leader = "\n";
    this.tag = "<" + tag + ">";
    this.body = body;
    this.end = "";
    this.trailer = "";
    this.parts = parts;
    this.more = more;
  }

  public static final String[] tags = {"table", "tr", "td"};

  public Parse(String text) throws FitParseException {
    this(text, tags, 0, 0);
  }

  public Parse(String text, String[] tags) throws FitParseException {
    this(text, tags, 0, 0);
  }

  public Parse(String text, String[] tags, int level, int offset) throws FitParseException {
    String lc = text.toLowerCase();
    int startTag = lc.indexOf("<" + tags[level]);
    int endTag = lc.indexOf(">", startTag) + 1;
//		int startEnd = lc.indexOf("", startEnd) + 1;
    int startMore = lc.indexOf("<" + tags[level], endEnd);
    if (startTag < 0 || endTag < 0 || startEnd < 0 || endEnd < 0) {
      throw new FitParseException("Can't find tag: " + tags[level], offset);
    }

    leader = text.substring(0, startTag);
    tag = text.substring(startTag, endTag);
    body = text.substring(endTag, startEnd);
    end = text.substring(startEnd, endEnd);
    trailer = text.substring(endEnd);

    if (level + 1 < tags.length) {
      parts = new Parse(body, tags, level + 1, offset + endTag);
      body = null;
    } else { // Check for nested table
      int index = body.indexOf("<" + tags[0]);
      if (index >= 0) {
        parts = new Parse(body, tags, 0, offset + endTag);
        body = "";
      }
    }

    if (startMore >= 0) {
      more = new Parse(trailer, tags, level, offset + endEnd);
      trailer = null;
    }
  }

  /* Added by Rick Mugridge, Feb 2005 */
  protected static int findMatchingEndTag(String lc, int matchFromHere, String tag, int offset) throws FitParseException {
    int fromHere = matchFromHere;
    int count = 1;
    int startEnd = 0;
    while (count > 0) {
      int embeddedTag = lc.indexOf("<" + tag, fromHere);
      int embeddedTagEnd = lc.indexOf("", embeddedTag) + 1;
      } else if (embeddedTagEnd < embeddedTag) {
        count--;
        startEnd = embeddedTagEnd;
        fromHere = lc.indexOf(">", embeddedTagEnd) + 1;
      }
    }
    return startEnd;
  }

  public int size() {
    return more == null ? 1 : more.size() + 1;
  }

  public Parse last() {
    return more == null ? this : more.last();
  }

  public Parse leaf() {
    return parts == null ? this : parts.leaf();
  }

  public Parse at(int i) {
    return i == 0 || more == null ? this : more.at(i - 1);
  }

  public Parse at(int i, int j) {
    return at(i).parts.at(j);
  }

  public Parse at(int i, int j, int k) {
    return at(i, j).parts.at(k);
  }

  public String text() {
    return unescape(unformat(body)).trim();
  }

  public static String unformat(String s) {
    int i = 0, j;
    while ((i = s.indexOf('<', i)) >= 0) {
      if ((j = s.indexOf('>', i + 1)) > 0) {
        s = s.substring(0, i) + s.substring(j + 1);
      } else
        break;
    }
    return s;
  }

  public static String unescape(String s) {
    StringBuilder sb = new StringBuilder(s);
    int i = -1, j;
    while ((i = sb.indexOf("&", i + 1)) >= 0) {
      if ((j = sb.indexOf(";", i + 1)) > 0) {
        String from = sb.substring(i + 1, j).toLowerCase();
        String to = null;
        if ((to = replacement(from)) != null) {
          sb.replace(i, j + 1, to);
        }
      }
    }
    return sb.toString();
  }


  public static String replacement(String from) {
    if (from.equals("lt"))
      return "<";
    else if (from.equals("gt"))
      return ">";
    else if (from.equals("amp"))
      return "&";
    else if (from.equals("nbsp"))
      return " ";
    else
      return null;
  }

  public void addToTag(String text) {
    int last = tag.length() - 1;
    tag = tag.substring(0, last) + text + ">";
  }

  public void addToBody(String text) {
    body = body + text;
  }

  public void print(PrintWriter out) {
    out.print(leader);
    out.print(tag);
    if (parts != null) {
      parts.print(out);
    } else {
      out.print(body);
    }
    out.print(end);
    if (more != null) {
      more.print(out);
    } else {
      out.print(trailer);
    }
  }
}