Implement fromEnvironment on bool, int and String

runtime/include/dart_api.h

Index: runtime/include/dart_api.h
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index 3cc6fb5ea0ef0eb286a367088c1d494e35155959..b05cd160022f4688eba771c0921c0f0278325e17 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -1477,7 +1477,7 @@ DART_EXPORT Dart_Handle Dart_StringToUTF8(Dart_Handle str,
 /**
  * Gets the data corresponding to the string object. This function returns
  * the data only for Latin-1 (ISO-8859-1) string objects. For all other
- * string objects it return and error.
+ * string objects it returns an error.
  *
  * \param str A string.
  * \param latin1_array An array allocated by the caller, used to return
@@ -2106,6 +2106,38 @@ typedef Dart_NativeFunction (*Dart_NativeEntryResolver)(Dart_Handle name,
 /* TODO(turnidge): Consider renaming to NativeFunctionResolver or
  * NativeResolver. */
 
+/*
+ * ==============
+ * Configurations

[Ivan Posva, 2013/10/29 21:42:59]

Environment here and everywhere else.

Please see the updated CL which has been taken over in this review.

[Søren Gjesse, 2013/10/30 11:44:02]

Done.

+ * ==============
+ */
+
+typedef enum {
+  kStringConfig = 0,
+  kIntegerConfig,
+  kBoolConfig
+} Dart_ConfigType;
+
+/**
+ * A configuration callback function.
+ *
+ * \param type The type used when asking for the configuration parameter.
+ * \param name The name of the configuration parameter.
+ *
+ * \return A valid handle to a string if the configuration parameter exists.
+ * A string must be returned for all configuration types as the Vm will parse
+ * the value returned. If the configuration parameter does not exist return
+ * Dart_Null().
+ */
+typedef Dart_Handle (*Dart_ConfigCallback)(Dart_ConfigType type,
+                                           Dart_Handle name);
+
+/**
+ * Sets the configuration callback for the current isolate. This callback is
+ * used to lookup configuration values by name in the current environment.
+ */
+DART_EXPORT Dart_Handle Dart_SetConfigCallback(Dart_ConfigCallback callback);
+
 /**
  * Sets the callback used to resolve native functions for a library.
  *