added ray tracing

extensions/fablabchemnitz/raytracing/desc_parser.py

@@ -0,0 +1,20 @@
+import re
+
+rgx_float = r"[-+]?(\d+([.,]\d*)?|[.,]\d+)([eE][-+]?\d+)?"
+rgx_name = "[a-z,_]*"
+optics_pattern = re.compile(
+    f"optics *: *(?P<material>{rgx_name})(: *(?P<num>{rgx_float}))?",
+    re.IGNORECASE | re.MULTILINE,
+)
+
+
+def get_optics_fields(string_: str):
+    fields = re.finditer(optics_pattern, string_)
+    return fields
+
+
+def clear_description(desc: str) -> str:
+    """Removes text corresponding to an optical property"""
+
+    new_desc = re.sub(optics_pattern, "", desc)
+    return new_desc