From 96a2601c301c04e4f2f8e6ab9fc15c232b649b01 Mon Sep 17 00:00:00 2001
From: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Date: Tue, 29 Dec 2020 00:08:43 +0100
Subject: [PATCH] Support non-integer bases in mathtext sqrt

---
 lib/matplotlib/_mathtext.py                   |   7 +-
 .../test_mathtext/mathtext_cm_83.pdf          | Bin 0 -> 9027 bytes
 .../test_mathtext/mathtext_cm_83.png          | Bin 0 -> 1713 bytes
 .../test_mathtext/mathtext_cm_83.svg          | 266 ++++++++++++++++++
 .../test_mathtext/mathtext_dejavusans_83.pdf  | Bin 0 -> 8554 bytes
 .../test_mathtext/mathtext_dejavusans_83.png  | Bin 0 -> 1901 bytes
 .../test_mathtext/mathtext_dejavusans_83.svg  | 207 ++++++++++++++
 .../test_mathtext/mathtext_dejavuserif_83.pdf | Bin 0 -> 8382 bytes
 .../test_mathtext/mathtext_dejavuserif_83.png | Bin 0 -> 1874 bytes
 .../test_mathtext/mathtext_dejavuserif_83.svg | 199 +++++++++++++
 .../test_mathtext/mathtext_stix_83.pdf        | Bin 0 -> 6841 bytes
 .../test_mathtext/mathtext_stix_83.png        | Bin 0 -> 1850 bytes
 .../test_mathtext/mathtext_stix_83.svg        | 206 ++++++++++++++
 .../test_mathtext/mathtext_stixsans_83.pdf    | Bin 0 -> 6950 bytes
 .../test_mathtext/mathtext_stixsans_83.png    | Bin 0 -> 1876 bytes
 .../test_mathtext/mathtext_stixsans_83.svg    | 184 ++++++++++++
 lib/matplotlib/tests/test_mathtext.py         |   1 +
 17 files changed, 1067 insertions(+), 3 deletions(-)
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_83.pdf
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_83.png
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_83.svg
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavusans_83.pdf
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavusans_83.png
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavusans_83.svg
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavuserif_83.pdf
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavuserif_83.png
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_dejavuserif_83.svg
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stix_83.pdf
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stix_83.png
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stix_83.svg
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stixsans_83.pdf
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stixsans_83.png
 create mode 100644 lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_stixsans_83.svg

diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
index 96a69919c86b..45e51f53984d 100644
--- a/lib/matplotlib/_mathtext.py
+++ b/lib/matplotlib/_mathtext.py
@@ -2158,7 +2158,8 @@ def __init__(self):
 
         p.sqrt <<= Group(
             Suppress(Literal(r"\sqrt"))
-            - ((Optional(p.lbracket + p.int_literal + p.rbracket, default=None)
+            - ((Group(Optional(
+                p.lbracket + OneOrMore(~p.rbracket + p.token) + p.rbracket))
                 + p.required_group)
                | Error("Expected \\sqrt{value}"))
         )
@@ -2864,10 +2865,10 @@ def sqrt(self, s, loc, toks):
 
         # Add the root and shift it upward so it is above the tick.
         # The value of 0.6 is a hard-coded hack ;)
-        if root is None:
+        if not root:
             root = Box(check.width * 0.5, 0., 0.)
         else:
-            root = Hlist([Char(x, state) for x in root])
+            root = Hlist(root)
             root.shrink()
             root.shrink()
 
diff --git a/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_83.pdf b/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext_cm_83.pdf
new file mode 100644
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diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
index 072d8f098b1d..3f52ebd37799 100644
--- a/lib/matplotlib/tests/test_mathtext.py
+++ b/lib/matplotlib/tests/test_mathtext.py
@@ -109,6 +109,7 @@
     r'$,$ $.$ $1{,}234{, }567{ , }890$ and $1,234,567,890$',  # github issue 5799
     r'$\left(X\right)_{a}^{b}$',  # github issue 7615
     r'$\dfrac{\$100.00}{y}$',  # github issue #1888
+    r'$\sqrt[ab]{123}$',  # github issue #8665
 ]
 
 digits = "0123456789"