Add support for ScalaJS and Scala Native

Binary compatibility with previous versions is maintained.

1 files changed, 56 insertions, 0 deletions

diff --git a/shared/src/main/scala/spray/json/JsonParserSettings.scala b/shared/src/main/scala/spray/json/JsonParserSettings.scala
new file mode 100644
index 0000000..8c76b0a
--- /dev/null
+++ b/shared/src/main/scala/spray/json/JsonParserSettings.scala
@@ -0,0 +1,56 @@
+package spray.json
+
+/**
+ * Allows to customize settings for the JSON parser.
+ *
+ * Use it like this:
+ *
+ * ```
+ * val customSettings =
+ *   JsonParserSettings.default
+ *     .withMaxDepth(100)
+ *     .withMaxNumberCharacters(20)
+ *
+ * JsonParser(jsonString, customSettings)
+ * // or
+ * jsonString.parseJson(customSettings)
+ * ```
+ */
+sealed trait JsonParserSettings {
+  /**
+   * The JsonParser uses recursive decent parsing that keeps intermediate values on the stack. To prevent
+   * StackOverflowExceptions a limit is enforced on the depth of the parsed JSON structure.
+   *
+   * As a guideline we tested that one level of depth needs about 300 bytes of stack space.
+   *
+   * The default is a depth of 1000.
+   */
+  def maxDepth: Int
+
+  /**
+   * Returns a copy of this settings object with the `maxDepth` setting changed to the new value.
+   */
+  def withMaxDepth(newValue: Int): JsonParserSettings
+
+  /**
+   * The maximum number of characters the parser should support for numbers. This is restricted because creating
+   * `BigDecimal`s with high precision can be very slow (approx. quadratic runtime per amount of characters).
+   */
+  def maxNumberCharacters: Int
+
+  /**
+   * Returns a copy of this settings object with the `maxNumberCharacters` setting changed to the new value.
+   */
+  def withMaxNumberCharacters(newValue: Int): JsonParserSettings
+}
+object JsonParserSettings {
+  val default: JsonParserSettings = SettingsImpl()
+
+  private case class SettingsImpl(
+    maxDepth: Int = 1000,
+    maxNumberCharacters: Int = 100
+  ) extends JsonParserSettings {
+    override def withMaxDepth(newValue: Int): JsonParserSettings = copy(maxDepth = newValue)
+    override def withMaxNumberCharacters(newValue: Int): JsonParserSettings = copy(maxNumberCharacters = newValue)
+  }
+}
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