Add additional operators to operators list

This is to ensure that they are wrapped appropriately in <mo> tags as
expected, instead of <mi> tags, which adversely changes the display, and
is also semantically incorrect.

Author: delfanbaum

latex2mathml/converter.py

@@ -31,8 +31,11 @@
     r">",
     r"<",
     r".",
+    r"\ast",
     r"\bigotimes",
+    r"\cdot",
     r"\centerdot",
+    r"\div",
     r"\dots",
     r"\dotsc",
     r"\dotso",
@@ -42,15 +45,18 @@
     r"\lvert",
     r"\lVert",
     r"\lvertneqq",
+    r"\mp",
     r"\ngeqq",
     r"\omicron",
+    r"\pm",
     r"\rvert",
     r"\rVert",
     r"\S",
     r"\smallfrown",
     r"\smallint",
     r"\smallsmile",
     r"\surd",
+    r"\times",
     r"\varsubsetneqq",
     r"\varsupsetneqq",
 )

tests/test_converter.py

@@ -19,6 +19,9 @@
         pytest.param("12x", MultiDict([("mn", "12"), ("mi", "x")]), id="numbers-and-identifiers"),
         pytest.param("+", {"mo": "+"}, id="single-operator"),
         pytest.param("3-2", MultiDict([("mn", "3"), ("mo", "−"), ("mn", "2")]), id="numbers-and-operators"),
+        pytest.param(r"3 \times 2", MultiDict([("mn", "3"), ("mo", "×"), ("mn", "2")]), id="numbers-and-operators-times"),
+        pytest.param(r"3 \cdot 2", MultiDict([("mn", "3"), ("mo", "·"), ("mn", "2")]), id="numbers-and-operators-cdot"),
+        pytest.param(r"3 \div 2", MultiDict([("mn", "3"), ("mo", "÷"), ("mn", "2")]), id="numbers-and-operators-div"),
         pytest.param(
             "3x*2",
             MultiDict([("mn", "3"), ("mi", "x"), ("mo", "*"), ("mn", "2")]),