File Part Reader

Groovy (beta) code posted
created at 10 Feb 17:11

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/* 
 * Copyright (C) 2007, 2008 Martin Kempf, Reto Kleeb, Michael Klenk
 *
 * IFS Institute for Software, HSR Rapperswil, Switzerland
 * http://ifs.hsr.ch/
 *
 */
package org.codehaus.groovy.eclipse.refactoring.core.utils

import org.codehaus.groovy.antlr.*;
import org.eclipse.jface.text.*;

/**
 * Reads parts of a file
 * @author reto kleeb
 */
class FilePartReader {
  
  private static String getLineInFile(filename, line){
    File fileObject = openFile(filename)
    fileObject.readLines().get(line-1)
  }
  
  private static getWords(line, range){
    def relevantPieceOfLine = line.getAt(range)
    relevantPieceOfLine = relevantPieceOfLine.replaceAll(/\(/, " ( ")
    relevantPieceOfLine = relevantPieceOfLine.replaceAll(/\)/, " ) ")
    relevantPieceOfLine.tokenize()
  }
  
  public static String readBackwardsFromCoordinate(IDocument doc, LineColumn coord){
    //make sure that no one reads from a file with impossible coordinates
    if(coord.getLine() > 0 && coord.getColumn() > 0) {
      int lineLength = doc.getLineLength(coord.getLine()-1)
      int offset = doc.getLineOffset(coord.getLine()-1)
      String line = doc.get(offset, lineLength)
      return getWords(line,(0..coord.getColumn()-2))[-1]
    } else {
      return " "
    }
  }
  
  public static String readForwardFromCoordinate(IDocument doc, LineColumn coord){
    //make sure that no one reads from a file with impossible coordinates
    if(coord.getLine() > 0 && coord.getColumn() > 0) {
      int lineLength = doc.getLineLength(coord.getLine()-1)
      int offset = doc.getLineOffset(coord.getLine()-1)
      String line = doc.get(offset, lineLength)
      return getWords(line,(coord.getColumn()-1..-1))[0]
    } else {
      return " "
    }
    
  }
  
  /*
   * DEPRECATED, no filenames anymore
  public static String readBackwardsFromCoordinate(filename, Coord){
    def relevantLine = getLineInFile(filename, Coord.getLine())
    return getWords(relevantLine,(0..Coord.getColumn()) )[-1]
  }
  
  public static String readForwardFromCoordinate(filename, Coord){
    def relevantLine = getLineInFile(filename, Coord.getLine())
    return getWords(relevantLine,(Coord.getColumn()..-1))[0]
  }*/
  
  private static boolean validateCoords(Top, Bottom){
    if(Top.getLine() > Bottom.getLine()) {
      return false
    }
    if(Top.getLine() == Bottom.getLine()){
      if(Top.getColumn() >= Bottom.getColumn() ){
        return false
      }
    }
    return true
  }
  
  private static File openFile(filename){
    File fileObject = new File(filename);
    
    if(  ! (fileObject.exists() && fileObject.isFile() && 
        fileObject.canRead() && !(fileObject.isDirectory()))){
        println "Error Reading File"
        return null
    }else{
      return fileObject
    }
  }
  
  public static String readPartsOfAFile(filename, Top, Bottom){
    
    if(!validateCoords(Top, Bottom)){
      return "IMPOSSIBLE COORDINATES"
    }
    
    int LineCounter = 0
    StringBuilder sb = new StringBuilder()
    
    try{
      File fileObject = openFile(filename)
      String LineDelimiter = getLineDelimiter(fileObject)
      
      int TopLine = Top.getLine()-1
      int BottomLine = Bottom.getLine()-1
      
      def LineArray = fileObject.readLines().getAt(TopLine..BottomLine)
  
      LineArray.each{line ->
        LineCounter++
        if(TopLine == BottomLine){
          return sb.append(line[Top.getColumn()..Bottom.getColumn()])
        }
        else if(LineCounter == 1){
          sb.append(line[Top.getColumn()..-1] + LineDelimiter)
        }
        else if(LineCounter == LineArray.size()){
          sb.append(line[0..Bottom.getColumn()] + LineDelimiter)
          return sb
        }
        else{
          sb.append(line + LineDelimiter)
        }
      }
    }  
    catch(Exception e){
      return "Couldn't read file contents at this position"
    }
    return sb.toString()
  
  }
  
  public static final String DEFAULT_LINE_DELIMITER = System.getProperty("line.separator");
  
  public static String getLineDelimiter(File file){

    def content = file.getText()
    def lineDelimiter = DEFAULT_LINE_DELIMITER
    int index = 0
    for (currentChar in content) {
      if(currentChar == '\r'){
        if(content[index+1] == '\n'){ 
          lineDelimiter = "\r\n"
          break
        }
        lineDelimiter =  "\r"    //mac os 9
        break
      }
      else if(currentChar == '\n'){
        lineDelimiter = "\n"
        break
      }
      index++;
    }
    return lineDelimiter;
  }
}
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