Implement console.log and friends

mbed-js-repl.lib

@@ -1 +1 @@
-https://github.com/janjongboom/mbed-js-repl/#5e3ca1bf1f0784e694109689c603a86491c40720
+https://github.com/janjongboom/mbed-js-repl/#3bb04531f83765ca6d115858d8a078d6ec1449df

mbed-js/jerryscript-mbed/jerryscript-mbed-launcher/source/launcher.cpp

@@ -66,11 +66,90 @@ static int load_javascript() {
     return 0;
 }
 
+static jerry_value_t console_log_handler(
+    const jerry_value_t func_value, /**< function object */
+    const jerry_value_t this_val, /**< this arg */
+    const jerry_value_t *args_p, /**< function arguments */
+    const jerry_length_t args_cnt) /**< number of function arguments */
+{
+    for (size_t ix = 0; ix < args_cnt; ix++) {
+        if (ix != 0) {
+            printf(", ");
+        }
+
+        const jerry_value_t returned_value = args_p[ix];
+
+        jerry_value_t str_value = jerry_value_to_string(returned_value);
+
+        jerry_size_t size = jerry_get_string_size(str_value);
+
+        jerry_char_t* ret_buffer = (jerry_char_t*)calloc(size + 1, 1);
+
+        jerry_string_to_char_buffer(str_value, ret_buffer, size);
+
+        if (jerry_value_is_string(returned_value)) {
+            printf("%s", ret_buffer);
+        }
+        else if (jerry_value_is_array(returned_value)) {
+            printf("[%s]", ret_buffer);
+        }
+        else {
+            printf("%s", ret_buffer);
+        }
+
+        free(ret_buffer);
+
+        jerry_release_value(str_value);
+    }
+
+    printf("\r\n");
+
+    return jerry_create_undefined();
+}
+
+
+void jsmbed_js_create_console_object() {
+    // Grab global object
+    jerry_value_t global_object = jerry_get_global_object();
+
+    // Create name 'console', which is an object
+    jerry_value_t console_prop_name = jerry_create_string((const jerry_char_t *) "console");
+    jerry_value_t console = jerry_create_object();
+
+    // log, warn, error names on console object
+    jerry_value_t log_name = jerry_create_string((const jerry_char_t *) "log");
+    jerry_value_t warn_name = jerry_create_string((const jerry_char_t *) "warn");
+    jerry_value_t error_name = jerry_create_string((const jerry_char_t *) "error");
+
+    // pointer to the implementation
+    jerry_value_t log_func_obj = jerry_create_external_function(&console_log_handler);
+
+    // attach the function to log/warn/error
+    jerry_set_property(console, log_name, log_func_obj);
+    jerry_set_property(console, warn_name, log_func_obj);
+    jerry_set_property(console, error_name, log_func_obj);
+
+    // attach console to global object
+    jerry_set_property(global_object, console_prop_name, console);
+
+    // and free...
+    jerry_release_value(log_func_obj);
+
+    jerry_release_value(log_name);
+    jerry_release_value(warn_name);
+    jerry_release_value(error_name);
+
+    jerry_release_value(console_prop_name);
+    jerry_release_value(console);
+    jerry_release_value (global_object);
+}
+
 int jsmbed_js_init() {
     jerry_init_flag_t flags = JERRY_INIT_EMPTY;
     jerry_init(flags);
 
     jsmbed_js_load_magic_strings();
+    jsmbed_js_create_console_object();
     mbed::js::LibraryRegistry::getInstance().register_all();
 
     return 0;

mbed_app.json

@@ -0,0 +1,8 @@
+{
+    "target_overrides": {
+        "*": {
+            "platform.stdio-baud-rate": 115200,
+            "platform.stdio-convert-newlines": true
+        }
+    }
+}

source/main.js

@@ -4,6 +4,6 @@ var iv = setInterval(function() {
     led.write(led.read() === 0 ? 1 : 0);
 }, 500);
 
-print("To stop LED1 from blinking, run `clearInterval(" + iv + ")`");
+console.log("To stop LED1 from blinking, run `clearInterval(" + iv + ")`");
 
 repl_start();