android-bindings: added a workaround to coerce JSON names to non-strings

Author: Miha-x64

android-bindings/src/main/kotlin/net/aquadc/persistence/android/json/stream.kt

@@ -67,7 +67,7 @@ fun TokenStream.writeTo(writer: JsonWriter): Unit =
         val tokToJson = enumMapOf(
                 Token.Null, JsonToken.NULL,
                 Token.Bool, JsonToken.BOOLEAN,
-                /*Token.I8, Token.I16, Token.I32, Token.I64, Token.F32, Token.F64, Token.Str, Token.Blob,*/
+                // Token.I8, Token.I16, Token.I32, Token.I64, Token.F32, Token.F64, Token.Str, Token.Blob,
                 Token.BeginSequence, JsonToken.BEGIN_ARRAY,
                 Token.EndSequence, JsonToken.END_ARRAY,
                 Token.BeginDictionary, JsonToken.BEGIN_OBJECT,
@@ -118,7 +118,14 @@ fun TokenStream.writeTo(writer: JsonWriter): Unit =
             return Token.EndDictionary
         }
 
-        val nextTok = if (coerceTo == null) nextToken else tokToJson[coerceTo]
+        val nextTok = if (coerceTo == null) nextToken else {
+            if (nextToken == JsonToken.NAME && coerceTo != Token.Str)
+                // JsonReader can't coerce names to other types, let's do it ourselves
+                return coerceTo.coerce(reader.nextName().also(_path::onName))
+
+            tokToJson[coerceTo]
+        }
+
         return if (nextTok == null) {
             val value = when (coerceTo!!) {
                 Token.I8 -> reader.nextInt().assertFitsByte()

android-bindings/src/test/kotlin/net/aquadc/persistence/android/PersistenceTest.kt

@@ -14,6 +14,7 @@ import net.aquadc.persistence.extended.partial
 import net.aquadc.persistence.struct.Schema
 import net.aquadc.persistence.struct.Struct
 import net.aquadc.persistence.struct.build
+import net.aquadc.persistence.tokens.Token
 import net.aquadc.persistence.tokens.readAs
 import net.aquadc.persistence.tokens.readListOf
 import net.aquadc.persistence.tokens.tokens
@@ -31,11 +32,13 @@ import net.aquadc.persistence.type.set
 import net.aquadc.persistence.type.string
 import net.aquadc.properties.persistence.enum
 import okio.ByteString.Companion.decodeHex
+import org.junit.Assert.assertArrayEquals
 import org.junit.Assert.assertEquals
 import org.junit.Assert.assertNotSame
 import org.junit.Assert.assertSame
 import org.junit.Test
 import java.io.StringWriter
+import java.util.Base64
 import java.util.EnumSet
 
 
@@ -153,8 +156,8 @@ class PersistenceTest {
         )
     }
 
-    val smallSchema = Tuple3("a", string, "b", string, "c", string)
-    val partialSmallSchema = partial(smallSchema)
+    private val smallSchema = Tuple3("a", string, "b", string, "c", string)
+    private val partialSmallSchema = partial(smallSchema)
 
     @Test fun `json empty partial`() {
         assertEquals(
@@ -238,6 +241,27 @@ class PersistenceTest {
         )
     }
 
+    @Test fun coercions() {
+        val blob = byteArrayOf(1, 2, 3)
+        val base = Base64.getEncoder().encodeToString(blob)
+        val tokens = """{"1":"456.789","$base":"123"}""".reader().json().tokens()
+
+        tokens.poll(Token.BeginDictionary)
+
+        assertEquals(Token.Str, tokens.peek())
+        assertEquals(1, tokens.poll(Token.I32))
+
+        assertEquals(Token.Str, tokens.peek())
+        assertEquals(456.789, tokens.poll(Token.F64))
+
+        assertEquals(Token.Str, tokens.peek())
+        assertArrayEquals(blob, tokens.poll(Token.Blob) as ByteArray)
+
+        assertEquals(Token.Str, tokens.peek())
+        assertEquals(123, tokens.poll(Token.I32))
+
+    }
+
     private fun <T> read(json: String, type: DataType<T>, lenient: Boolean = false): T =
             json.reader().json().also {
                 it.isLenient = lenient