1 files changed, 99 insertions, 0 deletions
diff --git a/doc/tools/coqrst/repl/ansicolors.py b/doc/tools/coqrst/repl/ansicolors.py
new file mode 100644
index 00000000..495eea91
--- /dev/null
+++ b/doc/tools/coqrst/repl/ansicolors.py
@@ -0,0 +1,99 @@
+##########################################################################
+##         #   The Coq Proof Assistant / The Coq Development Team       ##
+##  v      #   INRIA, CNRS and contributors - Copyright 1999-2018       ##
+## <O___,, #       (see CREDITS file for the list of authors)           ##
+##   \VV/  ###############################################################
+##    //   #    This file is distributed under the terms of the         ##
+##         #     GNU Lesser General Public License Version 2.1          ##
+##         #     (see LICENSE file for the text of the license)         ##
+##########################################################################
+"""
+Parse Coq's ANSI output.
+========================
+
+Translated to Python from Coq's terminal.ml.
+"""
+
+# pylint: disable=too-many-return-statements, too-many-branches
+
+def parse_color(style, offset):
+    color = style[offset] % 10
+    if color == 0:
+        return ("black", 1)
+    elif color == 1:
+        return ("red", 1)
+    elif color == 2:
+        return ("green", 1)
+    elif color == 3:
+        return ("yellow", 1)
+    elif color == 4:
+        return ("blue", 1)
+    elif color == 5:
+        return ("magenta", 1)
+    elif color == 6:
+        return ("cyan", 1)
+    elif color == 7:
+        return ("white", 1)
+    elif color == 9:
+        return ("default", 1)
+    elif color == 8:
+        nxt = style[offset + 1]
+        if nxt == 5:
+            return ("index-{}".format(style[offset + 1]), 2)
+        elif nxt == 2:
+            return ("rgb-{}-{}-{}".format(*style[offset+1:offset+4]), 4)
+        else:
+            raise ValueError("{}, {}".format(style, offset))
+    else:
+        raise ValueError()
+
+def parse_style(style, offset, acc):
+    offset = 0
+    while offset < len(style):
+        head = style[offset]
+
+        if head == 0:
+            acc.append("reset")
+        elif head == 1:
+            acc.append("bold")
+        elif head == 3:
+            acc.append("italic")
+        elif head == 4:
+            acc.append("underline")
+        elif head == 7:
+            acc.append("negative")
+        elif head == 22:
+            acc.append("no-bold")
+        elif head == 23:
+            acc.append("no-italic")
+        elif head == 24:
+            acc.append("no-underline")
+        elif head == 27:
+            acc.append("no-negative")
+        else:
+            color, suboffset = parse_color(style, offset)
+            offset += suboffset - 1
+            if 30 <= head < 40:
+                acc.append("fg-{}".format(color))
+            elif 40 <= head < 50:
+                acc.append("bg-{}".format(color))
+            elif 90 <= head < 100:
+                acc.append("fg-light-{}".format(color))
+            elif 100 <= head < 110:
+                acc.append("bg-light-{}".format(color))
+
+        offset += 1
+
+def parse_ansi(code):
+    """Parse an ansi code into a collection of CSS classes.
+
+    :param code: A sequence of ‘;’-separated ANSI codes.  Do not include the
+                 leading ‘^[[’ or the final ‘m’
+    """
+    classes = []
+    parse_style([int(c) for c in code.split(';')], 0, classes)
+    return ["ansi-" + cls for cls in classes]
+
+if __name__ == '__main__':
+    # As produced by Coq with ‘Check nat.’
+    print(parse_ansi("92;49;22;23;24;27"))