A processor receives a rule containing a first set of code statements. The processor compares the first set of code statements of the rule to a second set of code statements of a plurality of code statements of source code. The processor responds to a match of the first set of code statements of the rule and the second set of code statements of the plurality of code statements of the source code, by applying a weight modifier to the rule, which adds a weighted value to the rule, and the processor, in response to a second matching of the first set of code statements of the rule to the second set of code statements of the plurality of code statements of the source code, applies the weight modifier to the rule, which includes a weighted value, and the weight modifier adjusts the weighted value of the rule.