override fun visitComposable()

in rules/common/src/main/kotlin/com/twitter/compose/rules/ComposeNaming.kt [15:39]

• 19 lines of code
• 7 McCabe index (conditional complexity)

    override fun visitComposable(function: KtFunction, autoCorrect: Boolean, emitter: Emitter) {
        // If it's a block we can't know if there is a return type or not from ktlint
        if (!function.hasBlockBody()) return
        val functionName = function.name?.takeUnless(String::isEmpty) ?: return
        val firstLetter = functionName.first()

        if (function.returnsValue) {
            // If it returns value, the composable should start with a lowercase letter
            if (firstLetter.isUpperCase()) {
                // If it's allowed, we don't report it
                val isAllowed = function.config().getSet("allowedComposableFunctionNames", emptySet())
                    .any {
                        it.toRegex().matches(functionName)
                    }
                if (isAllowed) return
                emitter.report(function, ComposablesThatReturnResultsShouldBeLowercase)
            }
        } else {
            // If it returns Unit or doesn't have a return type, we should start with an uppercase letter
            // If the composable has a receiver, we can ignore this.
            if (firstLetter.isLowerCase() && !function.hasReceiverType) {
                emitter.report(function, ComposablesThatDoNotReturnResultsShouldBeCapitalized)
            }
        }
    }