ENH: add 'like_with_tols' search operator

This operator is converted in Client.search, but is provided as
a way for the UI to pass user-provided tolerances into the search
function

superscore/backends/filestore.py

@@ -339,10 +339,7 @@ def compare(op: str, data, target) -> bool:
         elif op == "like":
             if isinstance(data, str):
                 return re.search(target, data)
-            elif isinstance(data, (int, float)):
-                return data < 1.05 * target and data > .95 * target
-            else:
-                return NotImplemented
+        return NotImplemented
 
     @contextlib.contextmanager
     def _load_and_store_context(self) -> Generator[Dict[UUID, Any], None, None]:

superscore/client.py

@@ -7,7 +7,7 @@
 from uuid import UUID
 
 from superscore.backends import get_backend
-from superscore.backends.core import _Backend
+from superscore.backends.core import SearchTerm, _Backend
 from superscore.control_layers import ControlLayer, EpicsData
 from superscore.control_layers.status import TaskStatus
 from superscore.errors import CommunicationError
@@ -151,8 +151,20 @@ def search(self, *post) -> Generator[Entry, None, None]:
         """
         Search backend for entries matching all SearchTerms in ``post``.  Can search by any
         field, plus some special keywords. Backends support operators listed in _Backend.search.
+        Some operators are supported in the UI / client and must be converted before being
+        passed to the backend.
         """
-        return self.backend.search(*post)
+        new_search_terms = []
+        for search_term in post:
+            if search_term.operator == 'like_with_tols':
+                target, rel_tol, abs_tol = search_term.value
+                lower = target - target * rel_tol - abs_tol
+                upper = target + target * rel_tol + abs_tol
+                new_search_terms.append(SearchTerm(search_term.attr, 'gt', lower))
+                new_search_terms.append(SearchTerm(search_term.attr, 'lt', upper))
+            else:
+                new_search_terms.append(search_term)
+        return self.backend.search(*new_search_terms)
 
     def save(self, entry: Entry):
         """Save information in ``entry`` to database"""

superscore/tests/test_client.py

@@ -4,6 +4,7 @@
 
 import pytest
 
+from superscore.backends.core import SearchTerm
 from superscore.backends.filestore import FilestoreBackend
 from superscore.client import Client
 from superscore.control_layers import EpicsData
@@ -136,3 +137,15 @@ def test_find_config(sscore_cfg: str):
     # explicit SUPERSCORE_CFG env var supercedes XDG_CONFIG_HOME
     os.environ['SUPERSCORE_CFG'] = 'other/cfg'
     assert 'other/cfg' == Client.find_config()
+
+
+def test_search(sample_client):
+    results = list(sample_client.search(
+        SearchTerm('data', 'like_with_tols', (4, 0, 0))
+    ))
+    assert len(results) == 0
+
+    results = list(sample_client.search(
+        SearchTerm('data', 'like_with_tols', (4, .5, 1))
+    ))
+    assert len(results) == 4