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October 28, 2021 16:44
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Kotlin utils for React Native WritableMap/WritableArray
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| package com.barthap.rn.mlkit.ocr | |
| import android.graphics.Point | |
| import android.graphics.Rect | |
| import com.facebook.react.bridge.WritableArray | |
| import com.facebook.react.bridge.WritableMap | |
| import com.facebook.react.bridge.WritableNativeArray | |
| import com.facebook.react.bridge.WritableNativeMap | |
| import java.lang.IllegalArgumentException | |
| inline fun <reified T> Iterable<T>.toNativeArray() = WritableNativeArray().apply { | |
| forEach { el -> | |
| when (el) { | |
| is Int -> pushInt(el) | |
| is String -> pushString(el) | |
| is Double -> pushDouble(el) | |
| is Boolean -> pushBoolean(el) | |
| is Point -> pushMap(el.toNativeDict()) | |
| is Rect -> pushMap(el.toNativeDict()) | |
| is WritableMap -> pushMap(el) | |
| is WritableArray -> pushArray(el) | |
| // is Iterable<*> -> pushArray(el.toNativeArray()) | |
| // is Array<*> -> pushArray(el.toList().toNativeArray()) | |
| // is Map<String, *> -> pushMap(el.toNativeMap()) | |
| null -> pushNull() | |
| else -> throw IllegalArgumentException("Unknown element type: " + T::class.qualifiedName) | |
| } | |
| } | |
| } | |
| inline fun <reified T> Map<String, T>.toNativeMap() = | |
| WritableNativeMap().also { nativeMap -> | |
| for ((k, v) in this.entries) { | |
| when(v) { | |
| null -> nativeMap.putNull(k) | |
| is String -> nativeMap.putString(k, v) | |
| is Int -> nativeMap.putInt(k, v) | |
| is Double -> nativeMap.putDouble(k, v) | |
| is Boolean -> nativeMap.putBoolean(k, v) | |
| is Point -> nativeMap.putMap(k, v.toNativeDict()) | |
| is Rect -> nativeMap.putMap(k, v.toNativeDict()) | |
| is Iterable<*> -> nativeMap.putArray(k, v.toNativeArray()) | |
| is Array<*> -> nativeMap.putArray(k, v.toList().toNativeArray()) | |
| // is Map<*, *> -> nativeMap.putMap(k, v.toNativeMap()) | |
| is WritableArray -> nativeMap.putArray(k, v) | |
| is WritableMap -> nativeMap.putMap(k, v) | |
| else -> throw IllegalArgumentException("Unknown type: " + T::class.qualifiedName) | |
| } | |
| } | |
| } | |
| fun nativeMapOf(vararg pairs: Pair<String, Any?>): WritableMap = | |
| mapOf(*pairs).toNativeMap() | |
| fun nativeArrayOf(vararg elements: Any?): WritableArray | |
| = listOf(*elements).toNativeArray() | |
| fun Point.toNativeDict() = nativeMapOf( | |
| "x" to this.x, | |
| "y" to this.y | |
| ) | |
| fun Rect.toNativeDict() = nativeMapOf( | |
| "origin" to Point(left, top), | |
| "width" to width(), | |
| "height" to height() | |
| ) |
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| package com.barthap.rn.mlkit.ocr | |
| import android.net.Uri | |
| import com.facebook.react.bridge.* | |
| import com.google.mlkit.vision.common.InputImage | |
| import com.google.mlkit.vision.text.Text | |
| import com.google.mlkit.vision.text.TextRecognition | |
| import com.google.mlkit.vision.text.latin.TextRecognizerOptions | |
| class MLKitOcrModule(reactContext: ReactApplicationContext) : ReactContextBaseJavaModule(reactContext) { | |
| override fun getName() = "MLKitOcr" | |
| @ReactMethod | |
| fun recognizeText(uri: String, promise: Promise) { | |
| try { | |
| val image = InputImage.fromFilePath(reactApplicationContext, Uri.parse(uri)) | |
| val textRecognizer = TextRecognition.getClient(TextRecognizerOptions.DEFAULT_OPTIONS) | |
| textRecognizer.process(image) | |
| .addOnSuccessListener { visionText -> | |
| promise.resolve(convertResult(visionText)) | |
| }.addOnFailureListener { e -> | |
| promise.reject(e) | |
| e.printStackTrace() | |
| } | |
| } catch (e: Exception) { | |
| promise.reject(e) | |
| e.printStackTrace() | |
| } | |
| } | |
| private fun convertResult(result: Text): WritableMap { | |
| val blocks = result.textBlocks.map(::convertBlock).toNativeArray() | |
| return nativeMapOf( | |
| "text" to result.text, | |
| "blocks" to blocks | |
| ) | |
| } | |
| private fun convertBlock(block: Text.TextBlock): WritableMap { | |
| val blockLines = block.lines | |
| .map { line -> | |
| val elements = line.elements.map { element -> | |
| nativeMapOf( | |
| "text" to element.text, | |
| "frame" to element.boundingBox, | |
| "cornerPoints" to element.cornerPoints | |
| ) | |
| }.toNativeArray() | |
| nativeMapOf( | |
| "text" to line.text, | |
| "elements" to elements, | |
| "recognizedLanguages" to convertRecognizedLang(line.recognizedLanguage), | |
| "frame" to line.boundingBox, | |
| "cornerPoints" to line.cornerPoints | |
| ) | |
| }.toNativeArray() | |
| return nativeMapOf( | |
| "text" to block.text, | |
| "lines" to blockLines, | |
| "recognizedLanguages" to convertRecognizedLang(block.recognizedLanguage), | |
| "frame" to block.boundingBox, | |
| "cornerPoints" to block.cornerPoints | |
| ) | |
| } | |
| /** | |
| * converts `languageCode: string` into `[{ languageCode: string }]` | |
| */ | |
| private fun convertRecognizedLang(lang: String?) = nativeArrayOf(nativeMapOf( | |
| "languageCode" to lang | |
| )) | |
| } |
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