Function decRegexOptimizer

interpreter/decorators.go:131–170

decRegexOptimizer compiles regex pattern string constants.

(regexOptimizations ...*RegexOptimization)

// decRegexOptimizer compiles regex pattern string constants.
func decRegexOptimizer(regexOptimizations ...*RegexOptimization) InterpretableDecoratorV2 {
	functionMatchMap := make(map[string]*RegexOptimization)
	overloadMatchMap := make(map[string]*RegexOptimization)
	for _, m := range regexOptimizations {
		functionMatchMap[m.Function] = m
		if m.OverloadID != "" {
			overloadMatchMap[m.OverloadID] = m
		}
	}

	return func(i InterpretableV2) (InterpretableV2, error) {
		call, ok := i.(InterpretableCall)
		if !ok {
			return i, nil
		}

		var matcher *RegexOptimization
		var found bool
		if call.OverloadID() != "" {
			matcher, found = overloadMatchMap[call.OverloadID()]
		}
		if !found {
			matcher, found = functionMatchMap[call.Function()]
		}
		if !found || matcher.RegexIndex >= len(call.Args()) {
			return i, nil
		}
		args := call.Args()
		regexArg := args[matcher.RegexIndex]
		regexStr, isConst := regexArg.(InterpretableConst)
		if !isConst {
			return i, nil
		}
		pattern, ok := regexStr.Value().(types.String)
		if !ok {
			return i, nil
		}
		return matcher.Factory(call, string(pattern))
	}
}

func maybeOptimizeConstUnary(i InterpretableV2, call InterpretableCall) (InterpretableV2, error) {
	args := call.Args()