package org.greenstone.gsdl3.gs3build.util;

public class GS2TextFileHandler
{
  String  content;
  String  line;

  public GS2TextFileHandler(String content)
  { this.content = content;
  }
    
  public boolean hasMore()
  { return this.line != null;
  }

  public boolean hasMoreLines()
  { return this.content != null;
  }

  public String getEntry()
  { return this.getEntry(false);
  }

  public String getEntry(boolean breakSpace)
  { String reply;
    int start, tab = 0;
    boolean quoted = false;

    if (!this.hasMore()) {
      return null;
    }

    start = 0;
    while (start < this.line.length() &&
	   this.line.charAt(start) == ' ') {
      start ++;
    }

    if (start == this.line.length()) {
      this.line = null;
      return null;
    }
    
    if (this.line.charAt(start) == '"') {
      quoted = true;
      breakSpace = false;
      start ++;
    }
    tab = start;

    while (tab != this.line.length() &&
	   this.line.charAt(tab) != '\t' &&
	   !(quoted && this.line.charAt(tab) == '"') &&
	   !(this.line.charAt(tab) == ' ' && breakSpace))
    { tab ++;
    }

    if (start > 0) {
      this.line = this.line.substring(start);
      tab -= start;
    }
    
    if (tab == this.line.length()) {
      reply = this.line;
      this.line = null;
    }
    else {
      reply = this.line.substring(0, tab);
      this.line = this.line.substring(tab+1);
    }

    reply.trim();
    
    return reply;
  }

  public String getLine()
  { if (this.content == null) {
      this.line = null;
      return null;
    }
	
    do {
      int eol = this.content.indexOf('\n');
      if (eol < 0) {
	this.line = this.content;
	this.content = null;
      }
      else {
	this.line = this.content.substring(0, eol);
	this.content = this.content.substring(eol+1);
	while (this.content.length() > 0 &&
	       this.content.charAt(0) < ' ')
	{ this.content = this.content.substring(1);
	}
      }

      if (this.line != null) {
	this.line.trim();
      }
    } while (this.content != null && this.line != null && this.line.length() == 0);
    
    return this.line;
  }
}