#44 file resource runtime draft

resources/src/androidMain/kotlin/dev/icerock/moko/resources/FileResource.kt

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2020 IceRock MAG Inc. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package dev.icerock.moko.resources
+
+import java.io.File
+import java.net.URI
+
+actual class FileResource(
+    val assetsPath: String
+) {
+    actual fun readText(): String {
+        val assetUri: URI = URI.create("file:///android_asset/$assetsPath")
+        val file: File = File(assetUri)
+        return file.readText()
+    }
+}

resources/src/commonMain/kotlin/dev/icerock/moko/resources/FileResource.kt

@@ -0,0 +1,9 @@
+/*
+ * Copyright 2020 IceRock MAG Inc. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package dev.icerock.moko.resources
+
+expect class FileResource {
+    fun readText(): String
+}

resources/src/iosMain/kotlin/dev/icerock/moko/resources/FileResource.kt

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2020 IceRock MAG Inc. Use of this source code is governed by the Apache 2.0 license.
+ */
+
+package dev.icerock.moko.resources
+
+import kotlinx.cinterop.ObjCObjectVar
+import kotlinx.cinterop.alloc
+import kotlinx.cinterop.memScoped
+import kotlinx.cinterop.ptr
+import kotlinx.cinterop.value
+import platform.Foundation.NSBundle
+import platform.Foundation.NSError
+import platform.Foundation.NSString
+import platform.Foundation.NSURL
+import platform.Foundation.NSUTF8StringEncoding
+import platform.Foundation.stringWithContentsOfFile
+
+actual class FileResource(
+    val fileName: String,
+    val bundle: NSBundle = NSBundle.mainBundle
+) {
+    val path: String get() = bundle.pathForResource(name = fileName, ofType = null, inDirectory = "files")!!
+    val url: NSURL get() = bundle.URLForResource(name = fileName, withExtension = null, subdirectory = "files")!!
+
+    actual fun readText(): String {
+        val (result: String?, error: NSError?) = memScoped {
+            val p = alloc<ObjCObjectVar<NSError?>>()
+            val result: String? = runCatching {
+                NSString.stringWithContentsOfFile(
+                    path = path,
+                    encoding = NSUTF8StringEncoding,
+                    error = p.ptr
+                )
+            }.getOrNull()
+            result to p.value
+        }
+
+        if (error != null) throw RuntimeException(error.localizedDescription)
+        else return result!!
+    }
+}