1 files changed, 51 insertions, 0 deletions
diff --git a/ranger/ext/command_parser.py b/ranger/ext/command_parser.py
new file mode 100644
index 00000000..432f0364
--- /dev/null
+++ b/ranger/ext/command_parser.py
@@ -0,0 +1,51 @@
+class LazyParser(object):
+	"""Parse commands and extract information"""
+	def __init__(self, line):
+		self.line = line
+		self._chunks = None
+		self._rests = None
+		self._rests_loaded = 0
+		self._rests_gen_instance = None
+
+		try:
+			self.firstpart = line[:line.rindex(' ') + 1]
+		except ValueError:
+			self.firstpart = ''
+
+	def chunk(self, n, otherwise=''):
+		"""Chunks are pieces of the command seperated by spaces"""
+		if self._chunks is None:
+			self._chunks = line.split()
+
+		if len(self._chunks) > n:
+			return self._chunks[n]
+		else:
+			return otherwise
+
+	def rest(self, n, otherwise=''):
+		"""Rests are the strings which come after each word."""
+		if self._rests is None:
+			self._rests = list(self._rest_generator())
+			# TODO: Don't calculate all the rest elements if not needed
+
+		if len(self._rests) > n:
+			return self._rests[n]
+		else:
+			return otherwise
+
+	def _rest_generator(self):
+		lastrest = self.line
+		n = 0
+		while n < len(lastrest):
+			if lastrest[n] == ' ':
+				n += 1
+			else:
+				yield lastrest[n:]
+				n = lastrest.find(' ', n) + 1
+				if n <= 0:
+					break
+				lastrest = lastrest[n:]
+				n = 0
+
+	def __add__(self, newpart):
+		return self.firstpart + newpart