Get platform for scripts from script definition

Introduce 'platform' property in KotlinScripDefinition (should have a value which exists in TargetPlatform.ALL_KINDS)

^KT-27684 Fixed

compiler/psi/src/org/jetbrains/kotlin/script/KotlinScriptDefinition.kt

@@ -48,6 +48,10 @@ open class KotlinScriptDefinition(open val template: KClass<out Any>) : UserData
     open val fileExtension: String
         get() = "kts"
 
+    // Target platform for script, ex. "JVM", "JS", "NATIVE"
+    open val platform: String
+        get() = "JVM"
+
     open val dependencyResolver: DependenciesResolver get() = DependenciesResolver.NoDependencies
 
     open val acceptedAnnotations: List<KClass<out Annotation>> get() = emptyList()

compiler/psi/src/org/jetbrains/kotlin/script/KotlinScriptDefinitionProvider.kt

@@ -21,6 +21,7 @@ import com.intellij.openapi.components.ServiceManager
 import com.intellij.openapi.fileTypes.FileTypeRegistry
 import com.intellij.openapi.project.Project
 import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.psi.PsiFile
 import com.intellij.psi.PsiManager
 import org.jetbrains.kotlin.idea.KotlinFileType
 import org.jetbrains.kotlin.psi.KtFile
@@ -38,6 +39,11 @@ interface ScriptDefinitionProvider {
     }
 }
 
+fun findScriptDefinition(psiFile: PsiFile): KotlinScriptDefinition? {
+    val virtualFile = psiFile.virtualFile ?: psiFile.originalFile.virtualFile ?: return null
+    return findScriptDefinition(virtualFile, psiFile.project)
+}
+
 fun findScriptDefinition(file: VirtualFile, project: Project): KotlinScriptDefinition? {
     if (file.isDirectory ||
         file.extension == KotlinFileType.EXTENSION ||