Unpin pyparsing.

anntzer · anntzer · commit 720ac9ad7f5f · 2021-10-30T13:30:37.000+02:00
diff --git a/lib/matplotlib/_mathtext.py b/lib/matplotlib/_mathtext.py
@@ -2128,9 +2128,9 @@ def __init__(self):
         p.subsuper      <<= (
             (Optional(p.placeable)("nucleus")
              + OneOrMore(oneOf(["_", "^"]) - p.placeable)("subsuper")
-             + ZeroOrMore("'")("apostrophes"))
-            | OneOrMore("'")("apostrophes")
-            | (p.placeable("nucleus") + ZeroOrMore("'")("apostrophes"))
+             + Regex("'*")("apostrophes"))
+            | Regex("'+")("apostrophes")
+            | (p.placeable("nucleus") + Regex("'*")("apostrophes"))
         )
 
         p.token         <<= (
diff --git a/lib/matplotlib/tests/test_mathtext.py b/lib/matplotlib/tests/test_mathtext.py
@@ -250,7 +250,9 @@ def test_fontinfo():
         (r'$\leftF$', r'Expected a delimiter'),
         (r'$\rightF$', r'Unknown symbol: \rightF'),
         (r'$\left(\right$', r'Expected a delimiter'),
-        (r'$\left($', r'Expected "\right"'),
+        # PyParsing 2 uses double quotes, PyParsing 3 uses single quotes and an
+        # extra backslash.
+        (r'$\left($', re.compile(r'Expected ("|\'\\)\\right["\']')),
         (r'$\dfrac$', r'Expected \dfrac{num}{den}'),
         (r'$\dfrac{}{}$', r'Expected \dfrac{num}{den}'),
         (r'$\overset$', r'Expected \overset{annotation}{body}'),
@@ -281,8 +283,8 @@ def test_fontinfo():
 )
 def test_mathtext_exceptions(math, msg):
     parser = mathtext.MathTextParser('agg')
-
-    with pytest.raises(ValueError, match=re.escape(msg)):
+    match = re.escape(msg) if isinstance(msg, str) else msg
+    with pytest.raises(ValueError, match=match):
         parser.parse(math)
 
 
diff --git a/requirements/doc/doc-requirements.txt b/requirements/doc/doc-requirements.txt
@@ -13,7 +13,6 @@ ipython
 ipywidgets
 numpydoc>=0.8
 packaging>=20
-pyparsing<3.0.0
 mpl-sphinx-theme
 sphinxcontrib-svg2pdfconverter>=1.1.0
 sphinx-gallery>=0.10
diff --git a/requirements/testing/all.txt b/requirements/testing/all.txt
@@ -2,7 +2,6 @@
 
 certifi
 coverage
-pyparsing<3.0.0
 pytest!=4.6.0,!=5.4.0
 pytest-cov
 pytest-rerunfailures
diff --git a/setup.py b/setup.py
@@ -319,7 +319,7 @@ def make_release_tree(self, base_dir, files):
         "numpy>=1.17",
         "packaging>=20.0",
         "pillow>=6.2.0",
-        "pyparsing>=2.2.1,<3.0.0",
+        "pyparsing>=2.2.1",
         "python-dateutil>=2.7",
     ] + (
         # Installing from a git checkout.
