[code] performance fixes and better compliance

src/commonMain/kotlin/com/fab1an/kotlinjsonstream/BufferedSourceExtensions.kt

@@ -3,8 +3,9 @@ package com.fab1an.kotlinjsonstream
 import okio.BufferedSource
 import okio.ByteString
 import okio.ByteString.Companion.encodeUtf8
+import okio.Options
 
-private val BYTESTRING_ZERO = ByteString.of('0'.code.toByte())
+internal val BYTESTRING_ZERO = ByteString.of('0'.code.toByte())
 private val BYTESTRING_ONE = ByteString.of('1'.code.toByte())
 private val BYTESTRING_TWO = ByteString.of('2'.code.toByte())
 private val BYTESTRING_THREE = ByteString.of('3'.code.toByte())
@@ -14,13 +15,14 @@ private val BYTESTRING_SIX = ByteString.of('6'.code.toByte())
 private val BYTESTRING_SEVEN = ByteString.of('7'.code.toByte())
 private val BYTESTRING_EIGHT = ByteString.of('8'.code.toByte())
 private val BYTESTRING_NINE = ByteString.of('9'.code.toByte())
-private val BYTESTRING_HYPHEN = ByteString.of('-'.code.toByte())
+internal val BYTESTRING_HYPHEN = ByteString.of('-'.code.toByte())
 
-private val BYTESTRING_TAB = ByteString.of('\t'.code.toByte())
-private val BYTESTRING_CARRIAGE_RETURN = ByteString.of('\r'.code.toByte())
+internal val BYTESTRING_TAB = ByteString.of('\t'.code.toByte())
+internal val BYTESTRING_CARRIAGERETURN = ByteString.of('\r'.code.toByte())
 internal val BYTESTRING_NEWLINE = ByteString.of('\n'.code.toByte())
 internal val BYTESTRING_SPACE = ByteString.of(' '.code.toByte())
 
+internal val BYTESTRING_BACKSLASH_OR_DOUBLEQUOTE = "\\\"".encodeUtf8()
 internal val BYTESTRING_SQUAREBRACKET_OPEN = ByteString.of('['.code.toByte())
 internal val BYTESTRING_SQUAREBRACKET_CLOSE = ByteString.of(']'.code.toByte())
 internal val BYTESTRING_CURLYBRACKET_OPEN = ByteString.of('{'.code.toByte())
@@ -29,11 +31,44 @@ internal val BYTESTRING_COLON = ByteString.of(':'.code.toByte())
 internal val BYTESTRING_DOUBLEQUOTE = ByteString.of('"'.code.toByte())
 internal val BYTESTRING_DOT = ByteString.of('.'.code.toByte())
 internal val BYTESTRING_COMMA = ByteString.of(','.code.toByte())
+internal val BYTESTRING_BACKSLASH = ByteString.of('\\'.code.toByte())
 internal val BYTESTRING_TRUE = "true".encodeUtf8()
 internal val BYTESTRING_FALSE = "false".encodeUtf8()
 internal val BYTESTRING_NULL = "null".encodeUtf8()
+internal val BYTESTRING_FORWARDSLASH = "/".encodeUtf8()
+internal val BYTESTRING_BACKSPACE = "\b".encodeUtf8()
+internal val BYTESTRING_FORMFEED = "\u000c".encodeUtf8()
+
 internal val BYTESTRING_ESCAPED_DOUBLEQUOTE = """\"""".encodeUtf8()
-internal val BYTESTRING_ESCAPED_FORWARD_SLASH = """\\""".encodeUtf8()
+internal val BYTESTRING_ESCAPED_BACKSLASH = """\\""".encodeUtf8()
+internal val BYTESTRING_ESCAPED_FORWARDSLASH = """\/""".encodeUtf8()
+internal val BYTESTRING_ESCAPED_BACKSPACE = """\b""".encodeUtf8()
+internal val BYTESTRING_ESCAPED_FORMFEED = """\f""".encodeUtf8()
+internal val BYTESTRING_ESCAPED_NEWLINE = """\n""".encodeUtf8()
+internal val BYTESTRING_ESCAPED_CARRIAGERETURN = """\r""".encodeUtf8()
+internal val BYTESTRING_ESCAPED_TAB = """\t""".encodeUtf8()
+internal val BYTESTRING_START_OF_UNICODE_ESCAPE = """\u""".encodeUtf8()
+
+private val booleanOptions = Options.of(
+    BYTESTRING_TRUE,
+    BYTESTRING_FALSE
+)
+
+internal fun BufferedSource.readJsonBoolean(): Boolean {
+    return when (select(booleanOptions)) {
+        0 -> true
+        1 -> false
+        else -> error("expected true/false, but got: ${readUtf8CodePoint()}")
+    }
+}
+
+internal fun BufferedSource.nextIsHyphenOrAsciiDigit(): Boolean {
+    return when {
+        nextIsAsciiDigit() -> true
+        rangeEquals(0, BYTESTRING_HYPHEN) -> true
+        else -> false
+    }
+}
 
 internal fun BufferedSource.nextIsAsciiDigit(): Boolean {
     return when {
@@ -47,21 +82,24 @@ internal fun BufferedSource.nextIsAsciiDigit(): Boolean {
         rangeEquals(0, BYTESTRING_SEVEN) -> true
         rangeEquals(0, BYTESTRING_EIGHT) -> true
         rangeEquals(0, BYTESTRING_NINE) -> true
-        rangeEquals(0, BYTESTRING_HYPHEN) -> true
         else -> false
     }
 }
 
-internal fun BufferedSource.nextIsJsonWhiteSpace(): Boolean {
-    return when {
-        rangeEquals(0, BYTESTRING_TAB) -> true
-        rangeEquals(0, BYTESTRING_NEWLINE) -> true
-        rangeEquals(0, BYTESTRING_CARRIAGE_RETURN) -> true
-        rangeEquals(0, BYTESTRING_SPACE) -> true
-        else -> false
+private val whitespaceOptions = Options.of(
+    BYTESTRING_TAB,
+    BYTESTRING_CARRIAGERETURN,
+    BYTESTRING_NEWLINE,
+    BYTESTRING_SPACE
+)
+
+internal fun BufferedSource.skipWhitespace() {
+    while (select(whitespaceOptions) != -1) {
+        //
     }
 }
 
+
 internal fun BufferedSource.nextIs(byteString: ByteString): Boolean {
     return rangeEquals(0, byteString)
 }

src/commonMain/kotlin/com/fab1an/kotlinjsonstream/Extensions.kt

@@ -1,7 +1,7 @@
 package com.fab1an.kotlinjsonstream
 
 /**
- * Writes the [list] of [E] to this [JsonWriter], using the supplied [writerFn].
+ * Writes a [list] of [E] to this [JsonWriter], using the supplied [writerFn].
  *
  * @param E the type of the objects
  * @param list the list of objects
@@ -34,11 +34,11 @@ inline fun <E : Any> JsonReader.nextList(readerFn: JsonReader.() -> E): List<E>
 }
 
 /**
- * Writes the [set] of [E] to this [JsonWriter], using the supplied [writerFn].
+ * Writes a [Set] of [E] to this [JsonWriter], using the supplied [writerFn].
  *
  * @param E the type of the objects
  * @param set the set of objects
- * @param writerFn the writer function that is called using each item of the [list] as input
+ * @param writerFn the writer function that is called using each item of the [set] as input
  */
 inline fun <E : Any> JsonWriter.value(set: Set<E>, writerFn: JsonWriter.(E) -> Unit) {
     beginArray()
@@ -47,7 +47,7 @@ inline fun <E : Any> JsonWriter.value(set: Set<E>, writerFn: JsonWriter.(E) -> U
 }
 
 /**
- * Reads a [Set] of [E] from this [JsonReader]. This function assumes it is called at the start
+ * Reads a [set] of [E] from this [JsonReader]. This function assumes it is called at the start
  * of a JSON-array and reads each element using the supplied [readerFn].
  *
  * @param E the type of the objects