git-svn-id: svn://imanolbarba.net/PAD@3 c2ee353e-ed0d-4329-bf56-03aec153487f

Imanol-Mikel Barba Sabariego
1 parent 78ef8567
Showing 2 changed files with 184 additions and 6 deletions
readline/bin/pad/prac1/EditableBufferedReader.class
readline/src/pad/prac1/EditableBufferedReader.java
@@ -4,8 +4,53 @@ import java.io.*;
 public class EditableBufferedReader extends BufferedReader 
 {
+	/*
+	 * MODE DEFINITIONS
+	 */
+	
+	public static final int INSERT = 0;
+	public static final int OVERWRITE = 1;
+	public static final int DEL_BACKWARD = 0;
+	public static final int DEL_FORWARD = 1;
+	
+	/*
+	 * TYPE DEFINITIONS
+	 */
+	
+	public static final int ESCAPE_SEQUENCE = 0;
+	public static final int PRINTABLE = 1;
+	public static final int NON_PRINTABLE = 2;
+	
+	/* KEY DEFINITIONS
+	 * ESC (0x1B) starts an escape sequence
+	 * ESC+[+C (0x1B 0x5B 0x43) Cursor Forward
+	 * ESC+[+D (0x1B 0x5B 0x44) Cursor Backward
+	 * ESC+[+2+~ (0x1B 0x5B 0x32 0x7E) Insert
+	 * ESC+[+3+~ (0x1B 0x5B 0x33 0x7E) Delete forward
+	 * ESC+O+H (0x1B 0x4F 0x48) Home
+	 * ESC+O+F (0x1B 0x4F 0x46) End
+	 */
+	
+	public static final int RETURN_KEY 		= 0x0D;
+	public static final int BACKSPACE 		= 0x08;
+	public static final int BACKSPACE_DEL 	= 0x7B;
+	public static final int ESC 			= 0x1B;
+	public static final int ESC_SEQ 		= 0x5B;
+	public static final int FORWARD_C 		= 0x43;
+	public static final int BACKWARD_D		= 0x44;
+	public static final int DEL_3 			= 0x33;
+	public static final int TILDE 			= 0x7E;
+	public static final int HOME_END 		= 0x4F;
+	public static final int HOME 			= 0x48;
+	public static final int END 			= 0x46;
+	public static final int INSERT_2		= 0x32;
+	
 	private String line = "";
+	private int lineLength = 0;
+	private int cursorPosition = 1;
 	private boolean returnKey = false;
+	private int writeMode = INSERT;
+	
 	public EditableBufferedReader(Reader in)
 	{
@@ -29,6 +74,80 @@ public class EditableBufferedReader extends BufferedReader
 		Runtime.getRuntime().exec(cmd).waitFor();
 	}
+	private int parseKey(int key)
+	{
+		return PRINTABLE;
+	}
+	
+	public void addChar(char character)
+	{
+		//switch writemode
+		//if insert
+			//print space
+			//moveto cursorPosition-1
+			//print char
+			//add to string
+			//update string length
+			//update cursor position
+		//if overwrite
+			//just print char
+			//add to string
+			//update string length
+			//update cursor position
+	}
+	
+	public void delChar(int mode)
+	{
+		//switch mode
+		//if back
+			//del char using backspace
+			//remove char from line string
+			//update cursor position
+			//update line length
+		//if forward
+			//moveto cursorPosition+1
+			//del char using backspace
+			//remove char from line string
+			//update line length
+	}
+	
+	private void moveCursorForward()
+	{
+		System.out.print((char)ESC);
+		System.out.print((char)ESC_SEQ);
+		System.out.print((char)FORWARD_C);
+	}
+	
+	private void moveCursorBackward()
+	{
+		System.out.print((char)ESC);
+		System.out.print((char)ESC_SEQ);
+		System.out.print((char)BACKWARD_D);
+	}
+	
+	public void moveCursorTo(int pos)
+	{
+		if((pos <= lineLength) && (pos >= 1))
+		{
+			if(pos > cursorPosition)
+			{
+				for(int i = 0; i < (pos - cursorPosition); i++)
+				{
+					moveCursorForward();
+				}
+			}
+			
+			else if(pos < cursorPosition)
+			{
+				for(int i = 0; i < (cursorPosition - pos); i++)
+				{
+					moveCursorBackward();
+				}
+			}
+			cursorPosition = pos;
+		}
+	}
+	
 	public int read() throws IOException
 	{
 		return super.read();
@@ -50,16 +169,75 @@ public class EditableBufferedReader extends BufferedReader
 			try 
 			{
 				int character = read();
-				switch(character)
+				System.out.println("\n\n" + character + "\n");
+				switch(parseKey(character))
 				{
-					case 0x0D:
-						returnKey = true;
+					case ESCAPE_SEQUENCE:
+						if(read() == ESC_SEQ)
+						{
+							switch(read())
+							{
+								case FORWARD_C:
+									moveCursorTo(cursorPosition+1);
+									break;
+									
+								case BACKWARD_D:
+									moveCursorTo(cursorPosition-1);
+									break;
+								
+								case DEL_3:
+									if(read() == TILDE)
+									{
+										delChar(DEL_FORWARD);
+									}
+									break;
+									
+								case INSERT_2:
+									if(read() == TILDE)
+									{
+										writeMode = 1-writeMode;
+									}
+									break;
+									
+								case HOME_END:
+									switch(read())
+									{
+										case HOME:
+											moveCursorTo(1);
+											break;
+											
+										case END:
+											moveCursorTo(lineLength+1);
+											break;
+									}
+									break;
+							}
+						}
+						break;
+						
+					case PRINTABLE:
+						switch(character)
+						{
+							case RETURN_KEY:
+								returnKey = true;
+								break;
+							
+							case BACKSPACE:
+							case BACKSPACE_DEL:
+								delChar(DEL_BACKWARD);
+								break;
+															
+							default:
+								addChar((char)character);
+								break;
+						}
 						break;
-					default:
-						line += (char)character;
-						System.out.print((char)character);
+						
+					case NON_PRINTABLE:
+						//ignore
 						break;
 				}
+				
 			} 
 			catch (IOException e)
 			{