From d22c5ea93c89751bf929f48df8d01ea558e17257 Mon Sep 17 00:00:00 2001
From: Filipe <ocefpaf@gmail.com>
Date: Thu, 26 Sep 2024 13:10:44 +0200
Subject: [PATCH] Make antlr optional (#423)

* make antlr4 optional

* mark optional import with pytest

* add optional entry

* add py312

* add new locks

---------

Co-authored-by: Martin Yeo <40734014+trexfeathers@users.noreply.github.com>
---
 cf_units/tests/integration/parse/test_graph.py | 3 +++
 cf_units/tests/integration/parse/test_parse.py | 3 +++
 cf_units/tests/test_tex.py                     | 3 +++
 requirements/cf-units.yml                      | 3 ++-
 setup.cfg                                      | 4 +++-
 5 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/cf_units/tests/integration/parse/test_graph.py b/cf_units/tests/integration/parse/test_graph.py
index c48de9ad..9743b8a0 100644
--- a/cf_units/tests/integration/parse/test_graph.py
+++ b/cf_units/tests/integration/parse/test_graph.py
@@ -2,6 +2,9 @@
 #
 # This file is part of cf-units and is released under the BSD license.
 # See LICENSE in the root of the repository for full licensing details.
+import pytest
+
+antlr4 = pytest.importorskip("antlr4")
 
 import cf_units._udunits2_parser.graph as g
 from cf_units._udunits2_parser import parse
diff --git a/cf_units/tests/integration/parse/test_parse.py b/cf_units/tests/integration/parse/test_parse.py
index 5a86371c..b76fadbf 100644
--- a/cf_units/tests/integration/parse/test_parse.py
+++ b/cf_units/tests/integration/parse/test_parse.py
@@ -2,6 +2,9 @@
 #
 # This file is part of cf-units and is released under the BSD license.
 # See LICENSE in the root of the repository for full licensing details.
+import pytest
+
+antlr4 = pytest.importorskip("antlr4")
 
 import re
 
diff --git a/cf_units/tests/test_tex.py b/cf_units/tests/test_tex.py
index ce3977ad..966c887a 100644
--- a/cf_units/tests/test_tex.py
+++ b/cf_units/tests/test_tex.py
@@ -2,6 +2,9 @@
 #
 # This file is part of cf-units and is released under the BSD license.
 # See LICENSE in the root of the repository for full licensing details.
+import pytest
+
+antlr4 = pytest.importorskip("antlr4")
 
 from cf_units.tex import tex
 
diff --git a/requirements/cf-units.yml b/requirements/cf-units.yml
index 69b92a83..79cfcfa0 100644
--- a/requirements/cf-units.yml
+++ b/requirements/cf-units.yml
@@ -11,7 +11,6 @@ dependencies:
   - numpy
 
 # core dependencies
-  - antlr-python-runtime 4.11.1.*  # To update this, see cf_units/_udunits2_parser/README.md
   - cftime>=1.2
   - numpy<2
   - udunits2
@@ -28,3 +27,5 @@ dependencies:
 
 # docs dependencies
   - sphinx
+# latex
+  - antlr-python-runtime 4.11.1.*  # To update this, see cf_units/_udunits2_parser/README.md
diff --git a/setup.cfg b/setup.cfg
index 686837b0..deb05e84 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -35,7 +35,6 @@ version = attr: cf_units.__version__
 [options]
 include_package_data = True
 install_requires =
-    antlr4-python3-runtime ==4.11.1  # To update this, see cf_units/_udunits2_parser/README.md
     cftime >=1.2
     jinja2
     numpy ==1.26.4
@@ -47,6 +46,8 @@ python_requires =
 zip_safe = False
 
 [options.extras_require]
+latex =
+    antlr4-python3-runtime ==4.11.1  # To update this, see cf_units/_udunits2_parser/README.md
 docs =
     sphinx
 test =
@@ -58,6 +59,7 @@ test =
     pytest-cov
 all =
     pre-commit
+    %(latex)s
     %(docs)s
     %(test)s