public override bool Process(string cmd, TextFile textFile, EditorValues editorValues)
{
editorValues.RepeatLines = GetRepeatLines(cmd);
if (editorValues.CurrentLine > 0)
{
if (editorValues.RepeatLines == 0)
{
// delete current line
textFile.Delete(editorValues.CurrentLine);
}
else
{
// delete multiple lines
if (editorValues.CommandInfo.IndexOf(editorValues.Delim) > -1)
{
int lastLine = editorValues.CurrentLine + editorValues.RepeatLines - 1;
if (lastLine > textFile.Lines)
{
lastLine = textFile.Lines;
}
for (int i = editorValues.CurrentLine; i <= lastLine; i++)
{
textFile.Delete(editorValues.CurrentLine);
}
}
}
}
return(false);
}
public bool ProcessCommand(string command)
{
bool exit = false;
string commandToProcess = command.ToUpper();
string info = string.Empty;
int repeatLines = 0;
string delim = string.Empty;
// perform pre-processing
int lineNumber = 0;
bool isLineNuber = int.TryParse(command, out lineNumber);
if (isLineNuber && lineNumber <= _TextFile.Lines)
{
// entered a line number
currentLine = lineNumber;
commandToProcess = ".";
}
else if (command.Length > 1 && command.Substring(0, 1).ToUpper() == "L")
{
// change page size and list page
string temp = command.Substring(1);
int lines = 0;
bool linesOk = int.TryParse(temp, out lines);
if (lines > 0)
{
pageSize = lines;
}
commandToProcess = "L";
}
else if (command.Length >= 2 && command.ToUpper().Substring(0, 2) == "EX")
{
commandToProcess = "EX";
}
else if (command.Length > 1 && command.Substring(0, 1).ToUpper() == "R")
{
// possible "replace" command
repeatLines = GetRepeatLines(command);
delim = GetDelimiter(command);
if (repeatLines == 0)
{
repeatLines = 1;
info = command.Substring(2);
commandToProcess = "R";
}
else
{
string[] sections = command.Substring(1).Split(Convert.ToChar(delim));
if (sections.Length >= 2)
{
int pos = command.IndexOf(delim);
string lines = command.Substring(1, pos - 1);
repeatLines = 1;
bool linesOk = int.TryParse(lines, out repeatLines);
if (linesOk)
{
info = command.Substring(pos + 1);
commandToProcess = "R";
}
else
{
commandToProcess = null;
}
}
else
{
commandToProcess = null;
}
}
}
else if (command.Length > 1 && command.Substring(0, 1).ToUpper() == "D")
{
// delete commandToProcess
repeatLines = GetRepeatLines(command);
commandToProcess = "D";
}
// process command
switch (commandToProcess)
{
case ".":
// display current line
if (currentLine > 0)
{
Output(_TextFile.DisplayLine(currentLine, true));
}
break;
case "":
// next line
if (currentLine < _TextFile.Lines)
{
currentLine++;
}
Output(_TextFile.DisplayLine(currentLine, true));
break;
case "T":
// top of the text file
currentLine = 0;
Output("Top");
break;
case "L":
// list next page
if (_TextFile.Lines > 0)
{
int startLine = currentLine + 1;
int endLine = startLine + pageSize;
if (endLine > _TextFile.Lines)
{
endLine = _TextFile.Lines;
}
if (startLine < endLine)
{
for (int i = startLine; i < endLine; i++)
{
Output(_TextFile.DisplayLine(i, true));
}
}
else
{
Output(_TextFile.DisplayLine(currentLine, true));
}
currentLine += pageSize;
if (currentLine > _TextFile.Lines - 1)
{
currentLine = _TextFile.Lines - 1;
}
}
else
{
currentLine = 0;
}
break;
case "R":
// replace
if (currentLine > 0)
{
if (info == string.Empty)
{
// replace entire line
Console.Write(currentLine.ToString() + " ");
string newLine = Console.ReadLine();
_TextFile.Replace(currentLine, newLine);
}
else
{
// perform calculated replace
if (info.IndexOf(delim) > -1)
{
string[] replacementInfo = info.Split(Convert.ToChar(delim));
string oldText = replacementInfo[0];
string newText = replacementInfo[1];
for (int i = currentLine; i <= currentLine + repeatLines - 1; i++)
{
if (oldText == "" && newText != "")
{
// insert new text in front of the line
_TextFile.Insert(i, newText);
}
else if (oldText != "" && newText != "")
{
// replace old text with new text
_TextFile.Replace(i, oldText, newText);
}
else if (oldText != "" && newText == "" && replacementInfo.Length > 2)
{
// remove old text
_TextFile.Replace(i, oldText, "");
}
Output(_TextFile.DisplayLine(i, true));
}
}
currentLine += repeatLines - 1;
}
}
break;
case "I":
// insert lines
bool exitInsert = false;
while (!exitInsert)
{
Console.Write(string.Format("{0:000}+", currentLine));
string newLine = Console.ReadLine();
if (newLine != string.Empty)
{
_TextFile.Insert(currentLine, newLine, true);
currentLine++;
}
else
{
exitInsert = true;
}
}
break;
case "D":
// delete lines
if (currentLine > 0)
{
if (repeatLines == 0)
{
// delete current line
_TextFile.Delete(currentLine);
}
else
{
// delete multiple lines
if (info.IndexOf(delim) > -1)
{
int lastLine = currentLine + repeatLines - 1;
if (lastLine > _TextFile.Lines)
{
lastLine = _TextFile.Lines;
}
for (int i = currentLine; i <= lastLine; i++)
{
_TextFile.Delete(currentLine);
}
}
}
}
break;
case "X":
// cancel changes
_TextFile.Cancel();
if (currentLine > _TextFile.Lines)
{
currentLine = _TextFile.Lines;
}
break;
case "F":
// flip
_TextFile.Flip();
break;
case "FS":
// file-save and stay
_TextFile.Flip();
_TextFile.Save();
Output("Saved");
break;
case "FI":
// file-save and exit
_TextFile.Flip();
_TextFile.Save();
Output("Saved");
exit = true;
break;
case "EX":
// exit
if (_TextFile.HasChanged)
{
ReceiveInputEventArgs args = new ReceiveInputEventArgs("File has changed. Exit without saving (Y/N)? ");
OnReceiveInput(args);
if (args.InputValue.Substring(0, 1).ToUpper() == "Y")
{
exit = true;
}
}
else
{
exit = true;
}
break;
case "?":
// help
Output("-- ED.Net");
Output("-- A Pick-like line editor developed in C#");
Output("-- www.melvicorp.com");
Output("");
Output("Available commands and instructions:");
Output("");
Output(".");
Output(" Displays the current line.");
Output("{enter}");
Output(" Displays the current line and increments the current line number.");
Output("L[xx]");
Output(" Lists the next page of text lines based on the current page size");
Output(" (20 by default). If [xx] is specfied, then [xx] number of lines");
Output(" are listed and the current page size is reset to [xx] number of lines.");
Output("T");
Output(" Sets the current line counter to the top of the file.");
Output("R[xx][/old/new");
Output(" Performs a 'replace' operation.");
Output(" If 'R' is used on its own then you are given the opportunity to");
Output(" replace the entire line. Specifying [xx] will perform the 'replace'");
Output(" operation for [xx] number of lines.");
Output(" The 'old' and 'new' specify the text you want to replace and with");
Output(" what you it to be replaced. The delimiter specified as '/' can be");
Output(" any character you like in order to use any other characters");
Output(" in the 'old' and 'new' text. Specifying no 'old' text will insert");
Output(" the 'new' text at the beginning of the line(s).");
Output(" Usage examples:");
Output(" R/Using/Imports");
Output(" Replaces all instances of 'Using' with the text 'Imports'.");
Output(" R12/Using/Imports");
Output(" Performs the same operation for the next 12 lines.");
Output(" R5//''");
Output(" Inserts two tick marks in front of of the next 5 lines.");
Output(" R5..//");
Output(" Inserts two slashes in front of the next five lines.");
Output(" R.1/5/2008.01/05/2008");
Output(" Replaces the text '1/5/2008' with the text '01/05/2008'.");
Output("I[xx]");
Output(" Places the editor into 'Insert' mode at a point immediately following");
Output(" the current line. Hitting {enter} on a line witout typing any text");
Output(" will exit 'Insert' mode. Specifying [xx] will end 'Insert' mode");
Output(" after [xx] number of lines are inserted.");
Output("AL[xx]/text");
Output(" Performs an append opperation to a line or to [xx] number of lines.");
Output(" The delimiter specified by the '/' can be any character in order to");
Output(" accomodate any text to be appended (similarly to the 'R' command).");
Output("D[xx]");
Output(" Deletes the current line or [xx] number of lines.");
Output("X");
Output(" Rolls back the all changes since the last 'flip'");
Output(" (see the commands below).");
Output("F");
Output(" Performs a 'flip' operation. When any 'replace', insert', 'append',");
Output(" or 'delete' command is performed, the operations are not permanent in memory ");
Output(" until they are 'flipped', so they can be rolled back");
Output(" using the 'X' command. Performing a 'flip' operation brings those");
Output(" changes to permanent status. Note, permanent does not signify 'saved'.");
Output("FS");
Output(" Performs a 'flip' operation followed by a 'save' operation.");
Output("FI");
Output(" Performs a 'flip' operation followed by a 'save' operation; afterwhich");
Output(" the edit is exited.");
Output("EX");
Output(" Exits the editor in the current state of the file. If the file has");
Output(" changed since it was initially read in, the user will receive a");
Output(" confirmation message.");
Output("");
break;
}
return(exit);
}