added gui/ansi.py from David Barnetts branch

1 files changed, 66 insertions, 0 deletions

diff --git a/ranger/gui/ansi.py b/ranger/gui/ansi.py
new file mode 100644
index 00000000..7d5f2623
--- /dev/null
+++ b/ranger/gui/ansi.py
@@ -0,0 +1,66 @@
+# Copyright (C) 2010 David Barnett <davidbarnett2@gmail.com>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import re
+
+ansi_re = re.compile('(\x1b' + r'\[\d+(?:;\d+)*?m)')
+
+def split_ansi_from_text(ansi_text):
+	return ansi_re.split(ansi_text)
+
+def text_with_fg_bg(ansi_text):
+	for chunk in split_ansi_from_text(ansi_text):
+		if chunk.startswith('\x1b'):
+			attr_text = re.match('\x1b' + r'\[(.*?)m', chunk).group(1)
+			fg, bg = -1, -1
+			for attr in attr_text.split(';'):
+				m = re.match('^3(\d)$', attr)
+				if m:
+					fg = int(m.group(1))
+				m = re.match('^4(\d)$', attr)
+				if m:
+					bg = int(m.group(1))
+			yield (fg, bg)
+		else:
+			yield chunk
+
+def char_len(ansi_text):
+	return len(ansi_re.sub('', ansi_text))
+
+def char_slice(ansi_text, start, end):
+	slice_chunks = []
+	# skip to start
+	last_color = None
+	skip_len_left = start
+	len_left = end - start
+	for chunk in split_ansi_from_text(ansi_text):
+		m = ansi_re.match(chunk)
+		if m:
+			last_color = chunk
+		else:
+			if skip_len_left > len(chunk):
+				skip_len_left -= len(chunk)
+			else:		# finished skipping to start
+				if skip_len_left > 0:
+					chunk = chunk[skip_len_left:]
+				chunk_left = chunk[:len_left]
+				if len(chunk_left):
+					if last_color is not None:
+						slice_chunks.append(last_color)
+					slice_chunks.append(chunk_left)
+					len_left -= len(chunk_left)
+				if len_left == 0:
+					break
+	return ''.join(slice_chunks)