--- /dev/null
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2014 Johan Kayser <kayser.johan@gmail.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Provides PNaCl support for Nit.
+#
+# To use this module and compile for PNaCl, you must install the
+# NaCl SDK (This file is based on Pepper 33).
+# If NACL_SDK_ROOT is not set in your PATH, you have to work in
+# 'nacl_sdk/pepper_your_pepper_version/getting_started/your_project_folder'.
+module pnacl is platform
+
+import core
+intrude import core::stream
+
+in "C Header" `{
+ #include "ppapi/c/pp_errors.h"
+ #include "ppapi/c/ppp.h"
+ #include "ppapi/c/ppp_instance.h"
+ #include "ppapi/c/pp_bool.h"
+ #include "ppapi/c/ppb_var.h"
+ #include "ppapi/c/ppb_messaging.h"
+ #include "ppapi/c/ppp_messaging.h"
+ #include "ppapi/c/ppb_var_dictionary.h"
+ #include "ppapi/c/ppb_var_array.h"
+`}
+
+`{
+ #include <unistd.h>
+ #include <stddef.h>
+ #include <stdio.h>
+ #include <string.h>
+ #include <stdlib.h>
+ #include <pthread.h>
+ #include <poll.h>
+
+ #define MAX_DICTIONARY_QUEUE_SIZE 200
+ #define MAX_MESSAGE_QUEUE_SIZE 10
+
+ extern int nit_main(int, char**);
+
+ /* A working thread for Nit. */
+ static pthread_t g_nit_thread;
+
+ /* Mutex that guards the queues. */
+ static pthread_mutex_t g_dictionary_queue_mutex;
+ static pthread_mutex_t g_message_queue_mutex;
+
+ /* Condition variables that are signalled when the queues are not empty. */
+ static pthread_cond_t g_dictionary_queue_not_empty_cond;
+ static pthread_cond_t g_message_queue_not_empty_cond;
+
+ /** Circular queues of dictionaries and messages from JavaScript to be handled.
+ *
+ * If g_queue_start < g_queue_end:
+ * all elements in the range [g_queue_start, g_queue_end) are valid.
+ * If g_queue_start > g_queue_end:
+ * all elements in the ranges [0, g_queue_end) and
+ * [g_queue_start, MAX_QUEUE_SIZE) are valid.
+ * If g_queue_start == g_queue_end, and g_queue_size > 0:
+ * all elements in the g_queue are valid.
+ * If g_queue_start == g_queue_end, and g_queue_size == 0:
+ * No elements are valid. */
+ static struct PP_Var g_dictionary_queue[MAX_DICTIONARY_QUEUE_SIZE];
+ static char* g_message_queue[MAX_MESSAGE_QUEUE_SIZE];
+
+ /* The index of the head of the queues. */
+ static int g_dictionary_queue_start = 0;
+ static int g_message_queue_start = 0;
+
+ /* The index of the tail of the queues, non-inclusive. */
+ static int g_dictionary_queue_end = 0;
+ static int g_message_queue_end = 0;
+
+ /* The size of the queues. */
+ static int g_dictionary_queue_size = 0;
+ static int g_message_queue_size = 0;
+
+ /* PNaCl interfaces. */
+ const PPB_Messaging* g_varMessagingInterface;
+ const PPB_Var* g_varInterface;
+ const PPB_VarDictionary* g_varDictionaryInterface;
+ const PPB_VarArray* g_varArrayInterface;
+
+ PP_Instance g_instance;
+ PnaclApp app;
+
+ /* A wrapper to launch the Nit main on a new thread. */
+ void* WrapperNitMain(void* arg) {
+ nit_main(0, NULL);
+ return NULL;
+ }
+
+ /** Return whether the queues are empty.
+ *
+ * NOTE: this function assumes g_queue_mutex lock is held.
+ * @return non-zero if the queue is empty. */
+ static int IsDictionaryQueueEmpty() { return g_dictionary_queue_size == 0; }
+ static int IsMessageQueueEmpty() { return g_message_queue_size == 0; }
+
+ /** Return whether the queues are full.
+ *
+ * NOTE: this function assumes g_queue_mutex lock is held.
+ * @return non-zero if the queue is full. */
+ static int IsDictionaryQueueFull() { return g_dictionary_queue_size == MAX_DICTIONARY_QUEUE_SIZE; }
+ static int IsMessageQueueFull() { return g_message_queue_size == MAX_MESSAGE_QUEUE_SIZE; }
+
+ /* Initialize the queues. */
+ void InitializeQueues() {
+ pthread_mutex_init(&g_dictionary_queue_mutex, NULL);
+ pthread_cond_init(&g_dictionary_queue_not_empty_cond, NULL);
+ pthread_mutex_init(&g_message_queue_mutex, NULL);
+ pthread_cond_init(&g_message_queue_not_empty_cond, NULL);
+ }
+
+ /** Enqueue a dictionary (i.e. add to the end)
+ *
+ * If the queue is full, the dictionary will be dropped.
+ *
+ * NOTE: this function assumes g_dictionary_queue_mutex is _NOT_ held.
+ * @param[in] dictionary, the dictionary to enqueue.
+ * @return non-zero if the dictionary was added to the queue. */
+ int EnqueueDictionary(struct PP_Var dictionary) {
+ pthread_mutex_lock(&g_dictionary_queue_mutex);
+
+ /* We shouldn't block the main thread waiting for the queue to not be full,
+ * so just drop the dictionary. */
+ if (IsDictionaryQueueFull()) {
+ pthread_mutex_unlock(&g_dictionary_queue_mutex);
+ return 0;
+ }
+
+ g_dictionary_queue[g_dictionary_queue_end] = dictionary;
+ g_dictionary_queue_end = (g_dictionary_queue_end + 1) % MAX_DICTIONARY_QUEUE_SIZE;
+ g_dictionary_queue_size++;
+
+ pthread_cond_signal(&g_dictionary_queue_not_empty_cond);
+
+ pthread_mutex_unlock(&g_dictionary_queue_mutex);
+
+ return 1;
+ }
+
+ /** Enqueue a message (i.e. add to the end)
+ *
+ * If the queue is full, the message will be dropped.
+ *
+ * NOTE: this function assumes g_message_queue_mutex is _NOT_ held.
+ * @param[in] message The message to enqueue.
+ * @return non-zero if the message was added to the queue. */
+ int EnqueueMessage(char* message) {
+ pthread_mutex_lock(&g_message_queue_mutex);
+
+ /* We shouldn't block the main thread waiting for the queue to not be full,
+ * so just drop the message. */
+ if (IsMessageQueueFull()) {
+ pthread_mutex_unlock(&g_message_queue_mutex);
+ return 0;
+ }
+
+ g_message_queue[g_message_queue_end] = message;
+ g_message_queue_end = (g_message_queue_end + 1) % MAX_MESSAGE_QUEUE_SIZE;
+ g_message_queue_size++;
+
+ pthread_cond_signal(&g_message_queue_not_empty_cond);
+
+ pthread_mutex_unlock(&g_message_queue_mutex);
+
+ return 1;
+ }
+
+ /** Dequeue a dictionary and return it.
+ *
+ * This function blocks until a dictionary is available. It should not be called
+ * on the main thread.
+ *
+ * NOTE: this function assumes g_dictionary_queue_mutex is _NOT_ held.
+ * @return The dictionary at the head of the queue. */
+ struct PP_Var DequeueDictionary() {
+ struct PP_Var dictionary = g_varDictionaryInterface->Create();
+
+ pthread_mutex_lock(&g_dictionary_queue_mutex);
+
+ while (IsDictionaryQueueEmpty()) {
+ pthread_cond_wait(&g_dictionary_queue_not_empty_cond, &g_dictionary_queue_mutex);
+ }
+
+ dictionary = g_dictionary_queue[g_dictionary_queue_start];
+ g_dictionary_queue_start = (g_dictionary_queue_start + 1) % MAX_DICTIONARY_QUEUE_SIZE;
+ g_dictionary_queue_size--;
+
+ pthread_mutex_unlock(&g_dictionary_queue_mutex);
+
+ return dictionary;
+ }
+
+ /** Dequeue a message and return it.
+ *
+ * This function blocks until a message is available. It should not be called
+ * on the main thread.
+ *
+ * NOTE: this function assumes g_queue_mutex is _NOT_ held.
+ * @return The message at the head of the queue. */
+ char* DequeueMessage() {
+ char* message = NULL;
+
+ pthread_mutex_lock(&g_message_queue_mutex);
+
+ while (IsMessageQueueEmpty()) {
+ pthread_cond_wait(&g_message_queue_not_empty_cond, &g_message_queue_mutex);
+ }
+
+ message = g_message_queue[g_message_queue_start];
+ g_message_queue_start = (g_message_queue_start + 1) % MAX_MESSAGE_QUEUE_SIZE;
+ g_message_queue_size--;
+
+ pthread_mutex_unlock(&g_message_queue_mutex);
+
+ return message;
+ }
+
+ /* Posts a string message to JS. */
+ void PostMessage(char* message) {
+ /* Create PP_Var containing the message body. */
+ struct PP_Var varString = g_varInterface->VarFromUtf8(message, strlen(message));
+
+ /* Post message to the JavaScript layer. */
+ g_varMessagingInterface->PostMessage(g_instance, varString);
+ }
+
+ /* Posts a Dictionary (JS like object) to JS. */
+ void PostDictionary(struct PP_Var dictionary) {
+ g_varMessagingInterface->PostMessage(g_instance, dictionary);
+ }
+
+ /* Posts a Variable (aka PepperVar) to JS.
+ Should only be used for testing, conventional conversation is made
+ with Strings or Dictionaries. */
+ void PostVar(struct PP_Var v) {
+ g_varMessagingInterface->PostMessage(g_instance, v);
+ }
+
+ /* char* to PP_Var. */
+ static struct PP_Var CStrToVar(const char* str) {
+ if (g_varInterface != NULL) {
+ return g_varInterface->VarFromUtf8(str, strlen(str));
+ }
+ return PP_MakeUndefined();
+ }
+
+ static PP_Bool Instance_DidCreate(PP_Instance instance, uint32_t argc, const char* argn[], const char* argv[]) {
+ g_instance = instance;
+
+ /* Initialization of the queues and creation of the thread for Nit. */
+ InitializeQueues();
+ pthread_create(&g_nit_thread, NULL, &WrapperNitMain, NULL);
+
+ return PP_TRUE;
+ }
+
+ static void Instance_DidDestroy(PP_Instance instance) {
+ // TODO
+ }
+
+ static void Instance_DidChangeView(PP_Instance pp_instance, PP_Resource view) {
+ // TODO
+ }
+
+ static void Instance_DidChangeFocus(PP_Instance pp_instance, PP_Bool has_focus) {
+ // TODO
+ }
+
+ static PP_Bool Instance_HandleDocumentLoad(PP_Instance pp_instance, PP_Resource pp_url_loader) {
+ // TODO
+ return PP_FALSE;
+ }
+
+ /* Called when JS sends something, is set to accept Strings or Dictionaries,
+ returns an error if received object is not a String or Dictionary. */
+ void Messaging_HandleMessage(PP_Instance instance, struct PP_Var varMessage) {
+ if(varMessage.type == PP_VARTYPE_DICTIONARY) {
+ if(!EnqueueDictionary(varMessage)) {
+ struct PP_Var errorMessage = CStrToVar("QueueFull : dropped dictionary because the queue was full.");
+ g_varMessagingInterface->PostMessage(g_instance, errorMessage);
+ }
+ }
+ else if(varMessage.type == PP_VARTYPE_STRING) {
+ uint32_t len;
+ char* message = (char*)g_varInterface->VarToUtf8(varMessage, &len);
+ if(!EnqueueMessage(message)) {
+ struct PP_Var errorMessage = CStrToVar("QueueFull : dropped message because the queue was full.");
+ g_varMessagingInterface->PostMessage(g_instance, errorMessage);
+ }
+ }
+ else {
+ struct PP_Var errorMessage = CStrToVar("TypeError : only accepts JS objects or Strings");
+ g_varMessagingInterface->PostMessage(g_instance, errorMessage);
+ }
+ }
+
+ /* This function is called by Nit when using check_dictionary,
+ returns the dictionary at the head of the queue. */
+ void* NitHandleDictionary() {
+ struct PP_Var dictionary = DequeueDictionary();
+ PnaclApp_handle_dictionary(app, &dictionary);
+ return 0;
+ }
+
+ /* This function is called By Nit when waiting for a user input. */
+ char* NitHandleMessage() {
+ return DequeueMessage();
+ }
+
+ /* Entry point */
+ PP_EXPORT int32_t PPP_InitializeModule(PP_Module module_id, PPB_GetInterface get_browser_interface) {
+ /* Initializing global pointers. */
+ g_varMessagingInterface = (const PPB_Messaging*) get_browser_interface(PPB_MESSAGING_INTERFACE);
+ g_varInterface = (const PPB_Var*) get_browser_interface(PPB_VAR_INTERFACE);
+ g_varDictionaryInterface = (const PPB_VarDictionary*) get_browser_interface(PPB_VAR_DICTIONARY_INTERFACE);
+ g_varArrayInterface = (const PPB_VarArray*) get_browser_interface(PPB_VAR_ARRAY_INTERFACE);
+ return PP_OK;
+ }
+
+ PP_EXPORT void PPP_ShutdownModule() {
+ // TODO
+ }
+
+ PP_EXPORT const void* PPP_GetInterface(const char* interface_name) {
+ if (strcmp(interface_name, PPP_INSTANCE_INTERFACE) == 0)
+ {
+ static PPP_Instance instance_interface = {
+ &Instance_DidCreate,
+ &Instance_DidDestroy,
+ &Instance_DidChangeView,
+ &Instance_DidChangeFocus,
+ &Instance_HandleDocumentLoad
+ };
+ return &instance_interface;
+ }
+ else if (strcmp(interface_name, PPP_MESSAGING_INTERFACE) == 0) {
+ static PPP_Messaging messaging_interface = {
+ &Messaging_HandleMessage
+ };
+ return &messaging_interface;
+ }
+ return NULL;
+ }
+
+ /* Hack in order to avoid the problem with file. */
+ int poll(struct pollfd* fds, nfds_t nfds, int timeout) { return 0; }
+`}
+
+# Nit class representing a Pepper C API PP_Var typed as a Dictionary.
+extern class PepperDictionary `{ struct PP_Var* `}
+
+ new `{
+ struct PP_Var* self = malloc( sizeof( struct PP_Var ) );
+ *self = g_varDictionaryInterface->Create();
+ return self;
+ `}
+
+ # Get fonction using PepperVars.
+ #
+ # Returns the value that is associated with 'key'.
+ # If 'key' is not a String typed PepperVar, or doesn't exist in the Dictionary, an undefined PepperVar is returned.
+ fun native_get(key: PepperVar): PepperVar `{
+ struct PP_Var* value = malloc( sizeof ( struct PP_Var ) );
+ *value = g_varDictionaryInterface->Get(*self, *key);
+ return value;
+ `}
+
+ # Returns the value associated with 'key'.
+ #
+ # 'key' must be a String.
+ # If 'key' is not a String or doesn't exist in the Dictionary, 'null' is returned.
+ fun [](key: nullable Pepperable): nullable Pepperable
+ do
+ var native_key = key.to_pepper
+ var native_value = native_get(native_key)
+ return native_value.to_nit
+ end
+
+ # Set function using PepperVars.
+ #
+ # Sets the value associated with the specified key.
+ # 'key' must be a String typed PepperVar.
+ # If 'key' hasn't existed in the Dictionary, it is added and associated with 'value'.
+ # Otherwise, the previous value is replaced with 'value'.
+ # Returns a Boolean indicating whether the operation succeeds.
+ fun native_set(key: PepperVar, value: PepperVar): Bool `{
+ PP_Bool b;
+ b = g_varDictionaryInterface->Set(*self, *key, *value);
+ return b;
+ `}
+
+ # Sets the value associated with the specified key.
+ #
+ # 'key' must be a String.
+ # If 'key' hasn't existed in the Dictionary, it is added and associated with 'value'.
+ # Otherwise, the previous value is replaced with 'value'.
+ # Returns a Boolean indicating whether the operation succeeds.
+ fun []=(key: nullable Pepperable, value: nullable Pepperable): Bool
+ do
+ var native_key = key.to_pepper
+ var native_value = value.to_pepper
+ return native_set(native_key, native_value)
+ end
+
+ # Deletes the specified key and its associated value, if the key exists.
+ #
+ # Takes a String typed PepperVar.
+ fun native_delete(key: PepperVar) `{
+ g_varDictionaryInterface->Delete(*self, *key);
+ `}
+
+ # Deletes the specified key and its associated value, if the key exists.
+ #
+ # Takes a String.
+ fun delete(key: String)
+ do
+ var native_key = key.to_pepper
+ native_delete native_key
+ end
+
+ # Checks whether a key exists.
+ #
+ # Takes a String typed PepperVar.
+ fun native_has_key(key: PepperVar): Bool `{
+ PP_Bool b;
+ b = g_varDictionaryInterface->HasKey(*self, *key);
+ return b;
+ `}
+
+ # Checks whether a key exists.
+ #
+ # Takes a String.
+ fun has_key(key: String): Bool
+ do
+ var native_key = key.to_pepper
+ return native_has_key(native_key)
+ end
+
+ # Gets all the keys in a dictionary.
+ #
+ # Returns a PepperArray which contains all the keys of the Dictionary. The elements are string vars.
+ fun get_keys: PepperArray `{
+ struct PP_Var* array = malloc( sizeof( struct PP_Var ) );
+ *array = g_varDictionaryInterface->GetKeys(*self);
+ return array;
+ `}
+
+ # Use this function to copy a dictionary.
+ fun copy: PepperDictionary `{
+ struct PP_Var* varDictionary = malloc( sizeof( struct PP_Var ) );
+ *varDictionary = g_varDictionaryInterface->Create();
+ *varDictionary = *self;
+ return varDictionary;
+ `}
+end
+
+# Nit class representing a Pepper C API PP_Var typed as an Array.
+extern class PepperArray `{ struct PP_Var* `}
+
+ new `{
+ struct PP_Var* self = malloc( sizeof( struct PP_Var ) );
+ *self = g_varArrayInterface->Create();
+ return self;
+ `}
+
+ # Returns the element at the specified position as a PepperVar.
+ #
+ # If 'index' is larger than or equal to the array length, an undefined PepperVar is returned.
+ fun native_get(index: Int): PepperVar `{
+ struct PP_Var* value = malloc( sizeof( struct PP_Var ) );
+ *value = g_varArrayInterface->Get(*self, index);
+ return value;
+ `}
+
+ # Returns the element at the specified position.
+ #
+ # If 'index' is larger than or equal to the array length, 'null' is returned.
+ fun [](index: Int): nullable Pepperable
+ do
+ var native_value = native_get(index)
+ return native_value.to_nit
+ end
+
+ # Returns an int containing the length of the PepperArray.
+ fun length: Int `{
+ int length = g_varArrayInterface->GetLength(*self);
+ return length;
+ `}
+
+ # Takes a PepperVar for the 'value' param.
+ #
+ # Sets the value of an element in the array at indicated index.
+ # If 'index' is larger than or equal to the array length, the length is updated to be 'index' + 1.
+ # Any position in the array that hasn't been set before is set to undefined, i.e., PepperVar of C type PP_VARTYPE_UNDEFINED.
+ # Returns a Boolean indicating whether the operation succeeds.
+ fun native_set(index: Int, value: PepperVar): Bool `{
+ PP_Bool b;
+ b = g_varArrayInterface->Set(*self, index, *value);
+ return b;
+ `}
+
+ # Sets the value of an element in the array at indicated index.
+ #
+ # If 'index' is larger than or equal to the array length, the length is updated to be 'index' + 1.
+ # Any position in the array that hasn't been set before is set to undefined, i.e., PepperVar of C type PP_VARTYPE_UNDEFINED.
+ # Returns a Boolean indicating whether the operation succeeds.
+ fun []=(index: Int, value: nullable Pepperable): Bool
+ do
+ var native_value = value.to_pepper
+ return native_set(index, native_value)
+ end
+
+ # Sets the array length.
+ #
+ # If 'length' is smaller than its current value, the array is truncated to the new length.
+ # Any elements that no longer fit are removed and the references to them will be released.
+ # If 'length' is larger than its current value, undefined PepperVars are appended to increase the array to the specified length.
+ # Returns a Boolean indicating whether the operation succeeds.
+ fun length=(length: Int): Bool `{
+ PP_Bool b;
+ b = g_varArrayInterface->SetLength(*self, length);
+ return b;
+ `}
+end
+
+# Nit class representing a Pepper C API PP_Var.
+extern class PepperVar `{ struct PP_Var* `}
+
+ new `{
+ return malloc( sizeof( struct PP_Var ) );
+ `}
+
+ # Converts PepperVar to standard types.
+ #
+ # Actually supports bools, ints, floats, strings. To be used with 'isa'.
+ fun to_nit: nullable Pepperable
+ do
+ if isa_null then return null
+ if isa_bool then return as_bool
+ if isa_int then return as_int
+ if isa_float then return as_float
+ if isa_string then return as_string
+ if is_undefined then return null
+
+ return null
+ end
+
+ private fun isa_null: Bool `{ return self->type == PP_VARTYPE_NULL; `}
+ private fun isa_bool: Bool `{ return self->type == PP_VARTYPE_BOOL; `}
+ private fun isa_int: Bool `{ return self->type == PP_VARTYPE_INT32; `}
+ private fun isa_float: Bool `{ return self->type == PP_VARTYPE_DOUBLE; `}
+ private fun isa_string: Bool `{ return self->type == PP_VARTYPE_STRING; `}
+ private fun is_undefined: Bool `{ return self->type == PP_VARTYPE_UNDEFINED; `}
+
+ private fun as_bool: Bool `{ return self->value.as_bool; `}
+ private fun as_int: Int `{ return self->value.as_int; `}
+ private fun as_float: Float `{ return self->value.as_double; `}
+ private fun as_string: String import NativeString.to_s_with_length `{
+ uint32_t len;
+ char* str = (char*)g_varInterface->VarToUtf8(*self, &len);
+ return NativeString_to_s_with_length(str, len);
+ `}
+end
+
+# Provides a method to convert in PepperVars.
+interface Pepperable
+ fun to_pepper: PepperVar is abstract
+end
+
+redef class Int
+ super Pepperable
+
+ # Converts a Int into a PepperVar with Int type.
+ redef fun to_pepper `{
+ struct PP_Var* var = malloc( sizeof( struct PP_Var ) );
+ *var = PP_MakeInt32(self);
+ return var;
+ `}
+end
+
+redef class Float
+ super Pepperable
+
+ # Converts a Float into a PepperVar with Float type.
+ redef fun to_pepper `{
+ struct PP_Var* var = malloc( sizeof( struct PP_Var ) );
+ *var = PP_MakeDouble(self);
+ return var;
+ `}
+end
+
+redef class Bool
+ super Pepperable
+
+ # Converts a Bool into a PepperVar with Bool type.
+ redef fun to_pepper `{
+ struct PP_Var* var = malloc( sizeof( struct PP_Var ) );
+ *var = PP_MakeBool(self);
+ return var;
+ `}
+end
+
+redef class String
+ super Pepperable
+
+ # Converts a String into a PepperVar with String type.
+ redef fun to_pepper: PepperVar import String.to_cstring, String.length `{
+ char *str = String_to_cstring(self);
+ struct PP_Var* var = malloc( sizeof( struct PP_Var ) );
+ *var = g_varInterface->VarFromUtf8(str, String_length(self));
+ return var;
+ `}
+end
+
+# A stream for PNaCl, redefines basic input and output methods.
+class PnaclStream
+ super PollableReader
+ super Writer
+ super BufferedReader
+
+ init do prepare_buffer(10)
+
+ redef var end_reached: Bool = false
+
+ redef fun eof do return end_reached
+
+ # Redefintion of 'write' to send messages to the browser.
+ redef fun write(s: Text) do app.post_message s.to_s
+
+ redef fun is_writable: Bool do return true
+
+ # Checks if there is a message in the queue, and if so the message is handled automatically.
+ fun check_message: NativeString `{
+ return NitHandleMessage();
+ `}
+
+ # fill_buffer now checks for a message in the message queue which is filled by user inputs.
+ redef fun fill_buffer
+ do
+ _buffer_pos = 0
+ var nns = check_message
+ var nslen = nns.cstring_length
+ _buffer_length = nslen
+ nns.copy_to(buffer, nslen, 0, 0)
+ end
+end
+
+# For a PNaCl app, Sys uses PnaclStreams.
+redef class Sys
+ fun pnacl_stdstr: PnaclStream do return once new PnaclStream
+
+ # NaCl input.
+ redef fun stdin do return pnacl_stdstr
+
+ # NaCl output.
+ redef fun stdout do return pnacl_stdstr
+
+ # NaCl output for errors.
+ redef fun stderr do return pnacl_stdstr
+end
+
+# Class that provides the tools to interact with PNaCl.
+class PnaclApp
+
+ # Sets everything up to work, need to be called at first.
+ fun initialize import PnaclApp.handle_message, PnaclApp.handle_dictionary, NativeString.to_s_with_length `{
+ app = self;
+ `}
+
+ # Posts a message to JS.
+ fun post_message(message: String) import String.to_cstring `{
+ char* str = String_to_cstring(message);
+ PostMessage(str);
+ `}
+
+ # Posts a dictionary to JS.
+ fun post_dictionary(dictionary: PepperDictionary) `{
+ PostDictionary(*dictionary);
+ `}
+
+ # Posts a PepperVar to JS.
+ #
+ # Should be used for testing, not recommanded for conventional conversation.
+ private fun post_var(v: PepperVar) `{
+ PostVar(*v);
+ `}
+
+ # Is called when a message is received from JS.
+ #
+ # Is set to be redefined in your application to handle like you want.
+ fun handle_message(message: String)
+ do
+ # To be Implemented by user.
+ end
+
+ # Is called when a Dictionary is received from JS.
+ #
+ # Is set to be redefined in your application to handle like you want.
+ # The dictionary is freed after this method returns.
+ fun handle_dictionary(dictionary: PepperDictionary)
+ do
+ # To be Implemented by user.
+ end
+
+ # Checks if there is a dictionary in the queue, and if so the dictionary is handled automatically.
+ fun check_dictionary `{
+ NitHandleDictionary();
+ `}
+
+ # Infinite loop on check_dictionary
+ fun run
+ do
+ loop
+ check_dictionary
+ end
+ end
+end
+
+# Creates a new thread for Nit.
+#
+# This function launches the Nit main on a new thread.
+# Its purpose is to allow Nit to be still operational after an exit when needed,
+# because reloading the page may not be an option.
+#
+# Should only be used within the 'exit' before stopping the current thread
+# when the Nit execution causes a crash.
+#
+# REQUIRE: g_nit_thread and WrapperNitMain are set.
+fun create_thread `{
+ pthread_create(&g_nit_thread, NULL, &WrapperNitMain, NULL);
+`}
+
+# Calls 'pthread_exit on current thread.
+fun exit_thread(exit_value: Int) `{
+ pthread_exit((void*) exit_value);
+`}
+
+# Redef of exit in order to avoid the module to crash by terminating only the Nit thread.
+redef fun exit(exit_value: Int)
+do
+ var dictionary = new PepperDictionary
+ dictionary["exit"] = exit_value
+ app.post_dictionary dictionary
+ exit_thread exit_value
+end
+
+fun app: PnaclApp do return once new PnaclApp
nitlanguage / nit.git / blobdiff