StyleAttrUsesThemeDetector.kt

internal class StyleAttrUsesThemeDetector : ResourceXmlDetector() {

    companion object {
        val ISSUE = createErrorThemesAndStylesIssue(StyleAttrUsesThemeDetector::class, Scope.RESOURCE_FILE_SCOPE)
    }

    override fun appliesTo(folderType: ResourceFolderType) = folderType == ResourceFolderType.LAYOUT

    override fun getApplicableAttributes(): Collection<String> = XmlScannerConstants.ALL

    override fun visitAttribute(context: XmlContext, attribute: Attr) {
        if (attribute.name != "style") {
            return
        }

        ResourceUrl.parse(attribute.nodeValue)?.let { resourceUrl ->
            if (resourceUrl.name.contains("Theme")) {
                reportIssue(context, attribute)
            }
        }
    }

    private fun reportIssue(context: XmlContext, attribute: Attr) = context.report(
            issue = ISSUE,
            scope = attribute,
            location = context.getValueLocation(attribute),
            message = "`style` should not reference theme resources."
    )
}