Add more sizeable delimiters

oscargus · oscargus · commit ba34f203746a · 2023-06-23T15:27:51.000+02:00
diff --git a/doc/users/next_whats_new/mathtext_delimiters.rst b/doc/users/next_whats_new/mathtext_delimiters.rst
@@ -0,0 +1,12 @@
+``mathtext`` has more sizable delimiters
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The following delimiter names have been supported earlier, but can now be sized with
+``\left`` and ``\right``:
+
+* ``\lbrace``, ``\rbrace``, ``\leftbrace``, and ``\rightbrace``
+* ``\lbrack`` and ``\rbrack``
+* ``\leftparen`` and ``\rightparen``
+
+There are really no obvious advantages in using these.
+Instead, they are are added for completeness.
diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
@@ -1807,8 +1807,12 @@ class _MathStyle(enum.Enum):
     _ambi_delims = set(r"""
       | \| / \backslash \uparrow \downarrow \updownarrow \Uparrow
       \Downarrow \Updownarrow . \vert \Vert""".split())
-    _left_delims = set(r"( [ \{ < \lfloor \langle \lceil".split())
-    _right_delims = set(r") ] \} > \rfloor \rangle \rceil".split())
+    _left_delims = set(r"""
+      ( [ \{ < \lfloor \langle \lceil \lbrace \leftbrace \lbrack \leftparen
+      """.split())
+    _right_delims = set(r"""
+      ) ] \} > \rfloor \rangle \rceil \rbrace \rightbrace \rbrack \rightparen
+      """.split())
     _delims = _left_delims | _right_delims | _ambi_delims
 
     def __init__(self):
diff --git a/lib/matplotlib/_mathtext_data.py b/lib/matplotlib/_mathtext_data.py
@@ -1016,7 +1016,7 @@
     'leftparen'                : 40,
     'rightparen'               : 41,
     'bigoplus'                 : 10753,
-    'leftbrace'                : 124,
+    'leftbrace'                : 123,
     'rightbrace'               : 125,
     'jmath'                    : 567,
     'bigodot'                  : 10752,
diff --git a/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext1_dejavusans_05.png b/lib/matplotlib/tests/baseline_images/test_mathtext/mathtext1_dejavusans_05.png
diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
@@ -134,7 +134,7 @@
     r'$\sum x\quad\sum^nx\quad\sum_nx\quad\sum_n^nx\quad\prod x\quad\prod^nx\quad\prod_nx\quad\prod_n^nx$',  # GitHub issue 18085
     r'$1.$ $2.$ $19680801.$ $a.$ $b.$ $mpl.$',
     r'$\text{text}_{\text{sub}}^{\text{sup}} + \text{\$foo\$} + \frac{\text{num}}{\mathbf{\text{den}}}\text{with space, curly brackets \{\}, and dash -}$',
-
+    r'$\left\lbrace\frac{\left\lbrack A^b_c\right\rbrace}{\left\leftbrace D^e_f \right\rbrack}\right\rightbrace\ \left\leftparen\max_{x} \left\vert \frac{A}{B}\right\vert \right\rightparen$',
 ]
 
 digits = "0123456789"

Original file line number	Diff line number	Diff line change
`@@ -134,7 +134,7 @@`
`134`	`134`	`r'$\sum x\quad\sum^nx\quad\sum_nx\quad\sum_n^nx\quad\prod x\quad\prod^nx\quad\prod_nx\quad\prod_n^nx$', # GitHub issue 18085`
`135`	`135`	`r'$1.$ $2.$ $19680801.$ $a.$ $b.$ $mpl.$',`
`136`	`136`	`r'$\text{text}_{\text{sub}}^{\text{sup}} + \text{\$foo\$} + \frac{\text{num}}{\mathbf{\text{den}}}\text{with space, curly brackets \{\}, and dash -}$',`
`137`		`-`
	`137`	`+ r'$\left\lbrace\frac{\left\lbrack A^b_c\right\rbrace}{\left\leftbrace D^e_f \right\rbrack}\right\rightbrace\ \left\leftparen\max_{x} \left\vert \frac{A}{B}\right\vert \right\rightparen$',`
`138`	`138`	`]`
`139`	`139`
`140`	`140`	`digits = "0123456789"`