added content

Default (Linux).sublime-keymap

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+[
+		{ "keys": ["alt+ctrl+d"], "command": "xtoy"}
+]

Default (OSX).sublime-keymap

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+[
+		{ "keys": ["alt+ctrl+d"], "command": "xtoy"}
+]

Default (Windows).sublime-keymap

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+[
+		{ "keys": ["alt+ctrl+d"], "command": "xtoy"}
+]

XtoY.py

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+import sublime, sublime_plugin, re
+
+class XtoyCommand(sublime_plugin.TextCommand):
+	def run(self, edit):
+		for region in self.view.sel():
+			if region.empty():
+				line = self.view.line(region)
+				line_contents = '\n' + self.view.substr(line)
+				self.view.insert(edit, line.end(), self.replace(line_contents))
+			else:
+				self.view.insert(edit, region.end(), self.replace(self.view.substr(region)))
+
+	def replace(self, content):
+		patterns = {
+			"WIDTH"  :"HEIGHT",
+			"HEIGHT" :"WIDTH",
+			"X"      :"Y",
+			"Y"      :"X",
+			"width"  :"height",
+			"Width"  :"Height",
+			"Height" :"Width",
+			"x"      :"y",
+			"y"      :"x"
+		}
+		regex = re.compile("|".join(map(re.escape, patterns.keys())))
+		return regex.sub(lambda match: patterns[match.group(0)], content)