Complete chapter 5

README.md

@@ -7,4 +7,6 @@ due to requiring the `FFI` extension.
 
 * The `editor` prefix has been removed from all the relevant functions, instead they are methods on the `Editor` class.
 * Enums are faked with class constants
+* Properties that must be manually updated in the C version (like counts/string length) are implemented with magic methods,
+so they are essentially calculated on read.
 * Generally, if a function exists in PHP, with the same name as the C function, the PHP version will be used.

src/Editor.php

@@ -27,7 +27,7 @@ class Key {
 	public const ARROW_RIGHT = 'ARROW_RIGHT';
 	public const ARROW_UP = 'ARROW_UP';
 	public const BACKSPACE = 'BACKSPACE';
-	public const DEL_KEY = 'DEL';
+	public const DEL_KEY = 'DELETE';
 	public const END_KEY = 'END';
 	public const ENTER = 'ENTER';
 	public const ESCAPE = 'ESCAPE';
@@ -70,6 +70,27 @@ class Row {
 				return NULL;
 		}
 	}
+
+	public function update(): void
+	{
+		$idx = 0;
+
+		for ($i = 0; $i < $this->size; $i++)
+		{
+			if ($this->chars[$i] === "\t")
+			{
+				$this->render[$idx++] = ' ';
+				while ($idx % KILO_TAB_STOP !== 0)
+				{
+					$this->render[$idx++] = ' ';
+				}
+			}
+			else
+			{
+				$this->render[$idx++] = $this->chars[$i];
+			}
+		}
+	}
 }
 
 /**
@@ -233,32 +254,29 @@ class Editor {
 		return $rx;
 	}
 
-	protected function updateRow(Row $row): void
+	protected function insertRow(int $at, string $s): void
 	{
-		$idx = 0;
-
-		for ($i = 0; $i < $row->size; $i++)
+		if ($at < 0 || $at > $this->numRows)
 		{
-			if ($row->chars[$i] === "\t")
-			{
-				$row->render[$idx++] = ' ';
-				while ($idx % KILO_TAB_STOP !== 0)
-				{
-					$row->render[$idx++] = ' ';
-				}
-			}
-			else
-			{
-				$row->render[$idx++] = $row->chars[$i];
-			}
+			return;
 		}
-	}
 
-	protected function appendRow(string $s): void
-	{
-		$at = $this->numRows;
-		$this->rows[$at] = Row::new($s);
-		$this->updateRow($this->rows[$at]);
+		$row = Row::new($s);
+
+		if ($at === $this->numRows)
+		{
+			$this->rows[] = $row;
+		}
+		else
+		{
+			$this->rows = [
+				...array_slice($this->rows, 0, $at),
+				$row,
+				...array_slice($this->rows, $at),
+			];
+		}
+
+		$this->rows[$at]->update();
 
 		$this->dirty++;
 	}
@@ -288,15 +306,14 @@ class Editor {
 
 		// Safely insert into arbitrary position in the existing string
 		$row->chars = substr($row->chars, 0, $at) . $c . substr($row->chars, $at);
-
-		$this->updateRow($row);
+		$row->update();
 		$this->dirty++;
 	}
 
 	protected function rowAppendString(Row $row, string $s): void
 	{
 		$row->chars .= $s;
-		$this->updateRow($row);
+		$row->update();
 		$this->dirty++;
 	}
 
@@ -308,7 +325,7 @@ class Editor {
 		}
 
 		$row->chars = substr_replace($row->chars, '', $at, 1);
-		$this->updateRow($row);
+		$row->update();
 		$this->dirty++;
 	}
 
@@ -320,12 +337,34 @@ class Editor {
 	{
 		if ($this->cursorY === $this->numRows)
 		{
-			$this->appendRow('');
+			$this->insertRow($this->numRows, '');
 		}
 		$this->rowInsertChar($this->rows[$this->cursorY], $this->cursorX, $c);
 		$this->cursorX++;
 	}
 
+	protected function insertNewline(): void
+	{
+		if ($this->cursorX === 0)
+		{
+			$this->insertRow($this->cursorY, '');
+		}
+		else
+		{
+			$row = $this->rows[$this->cursorY];
+
+			// Add a new row, with the contents from the cursor to the end of the line
+			$this->insertRow($this->cursorY + 1, substr($row->chars, $this->cursorX));
+
+			// Update the (now previous) row
+			$row->chars = substr($row->chars, 0, $this->cursorX);
+			$row->update();
+		}
+
+		$this->cursorY++;
+		$this->cursorX = 0;
+	}
+
 	protected function deleteChar(): void
 	{
 		if ($this->cursorY === $this->numRows || ($this->cursorX === 0 && $this->cursorY === 0))
@@ -377,11 +416,17 @@ class Editor {
 
 		// #TODO gracefully handle issues with loading a file
 		$handle = fopen($fullname, 'rb');
+		if ($handle === FALSE)
+		{
+			disableRawMode();
+			print_r(error_clear_last());
+			die();
+		}
 
 		while (($line = fgets($handle)) !== FALSE)
 		{
 			// Remove line endings when reading the file
-			$this->appendRow(rtrim($line, "\n\r\0"));
+			$this->insertRow($this->numRows, rtrim($line));
 		}
 
 		fclose($handle);
@@ -393,7 +438,12 @@ class Editor {
 	{
 		if ($this->filename === '')
 		{
-			return;
+			$this->filename = $this->prompt('Save as: %s');
+			if ($this->filename === '')
+			{
+				$this->setStatusMessage('Save aborted');
+				return;
+			}
 		}
 
 		$contents = $this->rowsToString();
@@ -577,6 +627,40 @@ class Editor {
 	// ! Input
 	// ------------------------------------------------------------------------
 
+	protected function prompt(string $prompt): string
+	{
+		$buffer = '';
+		while (TRUE)
+		{
+			$this->setStatusMessage($prompt, $buffer);
+			$this->refreshScreen();
+
+			$c = $this->readKey();
+			$cord = ord($c);
+
+			if ($c === Key::ESCAPE)
+			{
+				$this->setStatusMessage('');
+				return '';
+			}
+
+			if ($c === Key::ENTER && $buffer !== '')
+			{
+				$this->setStatusMessage('');
+				return $buffer;
+			}
+
+			if ($c === Key::DEL_KEY  || $c === Key::BACKSPACE || $c === chr(ctrl_key('h')))
+			{
+				$buffer = substr($buffer, 0, -1);
+			}
+			else if ($cord < 128 && $this->ffi->iscntrl($cord) === 0)
+			{
+				$buffer .= $c;
+			}
+		}
+	}
+
 	protected function moveCursor(string $key): void
 	{
 		$row = ($this->cursorY >= $this->numRows)
@@ -648,7 +732,7 @@ class Editor {
 		switch ($c)
 		{
 			case Key::ENTER:
-				// TODO
+				$this->insertNewline();
 			break;
 
 			case chr(ctrl_key('q')):

src/functions.php

@@ -57,8 +57,6 @@ function read_stdin(int $len = 128): string
 {
 	$handle = fopen('php://stdin', 'rb');
 	$input = fread($handle, $len);
-
-	$input = rtrim($input);
 	fclose($handle);
 
 	return $input;
@@ -87,7 +85,16 @@ function read_stdout(int $len = 128): string
 	return $input;
 }
 
+/**
+ * Do bit twiddling to convert a letter into
+ * its Ctrl-letter equivalent
+ *
+ * @param string $char
+ * @return int
+ */
 function ctrl_key(string $char): int
 {
+	// b1,100,001 (a) & b0,011,111 = b0,000,001
+	// b1,100,010 (b) & b0,011,111 = b0,000,010
 	return ord($char) & 0x1f;
 }