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/**
* vimb - a webkit based vim like browser.
*
* Copyright (C) 2012-2014 Daniel Carl
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*/
#include "config.h"
#include "js.h"
static gboolean evaluate_string(JSContextRef ctx, const char *script,
const char *file, JSValueRef *result);
/**
* Run scripts out of given file in the given frame.
*/
gboolean js_eval_file(WebKitWebFrame *frame, const char *file)
{
char *js = NULL, *value = NULL;
GError *error = NULL;
if (g_file_test(file, G_FILE_TEST_IS_REGULAR)
&& g_file_get_contents(file, &js, NULL, &error)
) {
gboolean success = js_eval(frame, js, file, &value);
if (!success) {
fprintf(stderr, "%s", value);
}
g_free(value);
g_free(js);
return success;
}
return false;
}
/**
* Evaluates given string as script and return if this call succeed or not.
* On success the given **value pointer is filles with the returned string,
* else with the exception message. In both cases this must be freed by the
* caller if no longer used.
*/
gboolean js_eval(WebKitWebFrame *frame, const char *script, const char *file,
char **value)
{
gboolean success;
JSValueRef result = NULL;
JSContextRef ctx = webkit_web_frame_get_global_context(frame);
success = evaluate_string(ctx, script, file, &result);
*value = js_ref_to_string(ctx, result);
return success;
}
/**
* Creates a JavaScript object in contect of given frame.
*/
JSObjectRef js_create_object(WebKitWebFrame *frame, const char *script)
{
JSValueRef result = NULL, exc = NULL;
JSObjectRef object;
JSContextRef ctx = webkit_web_frame_get_global_context(frame);
if (!evaluate_string(ctx, script, NULL, &result)) {
return NULL;
}
object = JSValueToObject(ctx, result, &exc);
if (exc) {
return NULL;
}
JSValueProtect(ctx, result);
return object;
}
/**
* Calls a function on object and returns the result as newly allocates
* string.
* Returned string must be freed after use.
*/
char* js_object_call_function(JSContextRef ctx, JSObjectRef obj,
const char *func, int count, JSValueRef params[])
{
JSValueRef js_ret, function;
JSObjectRef function_object;
JSStringRef js_func = NULL;
char *value;
if (!obj) {
return NULL;
}
js_func = JSStringCreateWithUTF8CString(func);
if (!JSObjectHasProperty(ctx, obj, js_func)) {
JSStringRelease(js_func);
return NULL;
}
function = JSObjectGetProperty(ctx, obj, js_func, NULL);
function_object = JSValueToObject(ctx, function, NULL);
js_ret = JSObjectCallAsFunction(ctx, function_object, NULL, count, params, NULL);
JSStringRelease(js_func);
value = js_ref_to_string(ctx, js_ret);
return value;
}
/**
* Retrune a new allocates string for given valeu reference.
* String must be freed if not used anymore.
*/
char* js_ref_to_string(JSContextRef ctx, JSValueRef ref)
{
char *string;
size_t len;
JSStringRef str_ref;
if (!ref) {
return NULL;
}
str_ref = JSValueToStringCopy(ctx, ref, NULL);
len = JSStringGetMaximumUTF8CStringSize(str_ref);
string = g_new0(char, len);
JSStringGetUTF8CString(str_ref, string, len);
JSStringRelease(str_ref);
return string;
}
/**
* Retrieves a values reference for given string.
*/
JSValueRef js_string_to_ref(JSContextRef ctx, const char *string)
{
JSStringRef js = JSStringCreateWithUTF8CString(string);
JSValueRef ref = JSValueMakeString(ctx, js);
JSStringRelease(js);
return ref;
}
/**
* Runs a string as JavaScript and returns if the call succeed.
* In case the call succeed, the given *result is filled with the result
* value, else with the value reference of the exception.
*/
static gboolean evaluate_string(JSContextRef ctx, const char *script,
const char *file, JSValueRef *result)
{
JSStringRef js_str, js_file;
JSValueRef exc = NULL, res = NULL;
js_str = JSStringCreateWithUTF8CString(script);
js_file = JSStringCreateWithUTF8CString(file);
res = JSEvaluateScript(ctx, js_str, JSContextGetGlobalObject(ctx), js_file, 0, &exc);
JSStringRelease(js_file);
JSStringRelease(js_str);
if (exc) {
*result = exc;
return false;
}
*result = res;
return true;
}
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