Fix handling of latex combined subscript and superscript

Ronald Hartley-Davies · Ronald Hartley-Davies · commit 4513b6148508 · 2017-01-03T22:24:29.000Z
diff --git a/lib/matplotlib/mathtext.py b/lib/matplotlib/mathtext.py
@@ -2881,21 +2881,18 @@ def subsuper(self, s, loc, toks):
                 return toks[0] # .asList()
             else:
                 nucleus = toks[0]
-        elif len(toks) == 2:
-            op, next = toks
-            nucleus = Hbox(0.0)
-            if op == '_':
-                sub = next
-            else:
-                super = next
-        elif len(toks) == 3:
-            nucleus, op, next = toks
+        elif len(toks) in (2, 3):
+            # single subscript or superscript
+            nucleus = toks[0] if len(toks) == 3 else Hbox(0.0)
+            op, next = toks[-2:]
             if op == '_':
                 sub = next
             else:
                 super = next
-        elif len(toks) == 5:
-            nucleus, op1, next1, op2, next2 = toks
+        elif len(toks) in (4, 5):
+            # subscript and superscript
+            nucleus = toks[0] if len(toks) == 5 else Hbox(0.0)
+            op1, next1, op2, next2 = toks[-4:]
             if op1 == op2:
                 if op1 == '_':
                     raise ParseFatalException("Double subscript")
diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
@@ -106,6 +106,7 @@
     r'$6-2$; $-2$; $ -2$; ${-2}$; ${  -2}$; $20^{+3}_{-2}$',
     r'$\overline{\omega}^x \frac{1}{2}_0^x$', # github issue #5444
     r'$,$ $.$ $1{,}234{, }567{ , }890$ and $1,234,567,890$', # github issue 5799
+    r'$\left(X\right)_{a}^{b}$', # github issue 7615
 ]
 
 digits = "0123456789"

Original file line number	Diff line number	Diff line change
`@@ -106,6 +106,7 @@`
`106`	`106`	`r'$6-2$; $-2$; $ -2$; ${-2}$; ${ -2}$; $20^{+3}_{-2}$',`
`107`	`107`	`r'$\overline{\omega}^x \frac{1}{2}_0^x$', # github issue #5444`
`108`	`108`	`r'$,$ $.$ $1{,}234{, }567{ , }890$ and $1,234,567,890$', # github issue 5799`
	`109`	`+ r'$\left(X\right)_{a}^{b}$', # github issue 7615`
`109`	`110`	`]`
`110`	`111`
`111`	`112`	`digits = "0123456789"`