Merge pull request #79 from matlab-deep-learning/remove-from-empty-history

Special error message for removing from empty history

Author: ccreutzi

+llms/+utils/errorMessageCatalog.m

@@ -42,6 +42,7 @@
 catalog("llms:mustBeAssistantWithNameAndArguments") = "Field 'function' must be a struct with fields 'name' and 'arguments'.";
 catalog("llms:assistantMustHaveTextNameAndArguments") = "Fields 'name' and 'arguments' must be text with one or more characters.";
 catalog("llms:mustBeValidIndex") = "Index exceeds the number of array elements. Index must be less than or equal to {1}.";
+catalog("llms:removeFromEmptyHistory") = "Unable to remove message from empty message history.";
 catalog("llms:stopSequencesMustHaveMax4Elements") = "Number of stop sequences must be less than or equal to 4.";
 catalog("llms:endpointMustBeSpecified") = "Unable to find endpoint. Either set environment variable AZURE_OPENAI_ENDPOINT or specify name-value argument ""Endpoint"".";
 catalog("llms:deploymentMustBeSpecified") = "Unable to find deployment name. Either set environment variable AZURE_OPENAI_DEPLOYMENT or specify name-value argument ""Deployment"".";

messageHistory.m

@@ -213,6 +213,9 @@
                 this (1,1) messageHistory
                 idx (1,1) {mustBeInteger, mustBePositive}
             end
+            if isempty(this.Messages)
+                error("llms:removeFromEmptyHistory",llms.utils.errorMessageCatalog.getMessage("llms:removeFromEmptyHistory"));
+            end
             if idx>numel(this.Messages)
                 error("llms:mustBeValidIndex",llms.utils.errorMessageCatalog.getMessage("llms:mustBeValidIndex", string(numel(this.Messages))));
             end

tests/tmessageHistory.m

@@ -319,6 +319,10 @@ function invalidInputsResponsePrompt(testCase, InvalidInputsResponseMessage)
     struct("Input", {{0}}, ...
     "Error", "MATLAB:validators:mustBePositive"), ...
     ...
+    "FromEmpty", ...
+    struct("Input", {{1}}, ...
+    "Error", "llms:removeFromEmptyHistory"), ...
+    ...
     "NonScalarInput", ...
     struct("Input", {{[1 2]}}, ...
     "Error", "MATLAB:validation:IncompatibleSize"));