I am working on a Desktop Application project that will need scripting support, specifically scripting support for people familiar with web development. Even though I have prior experience successfully embedding both Lua and Python in server side applications, I have picked Javascript for this project. Mainly for the low barrier to entry for web developers, and the massive amount of documentation for the language. I am specifically testing out SpiderMonkey right now. I struggled trying to get SpiderMonkey to compile in Xcode 3.2.3 and am documenting how I got it to work. The JSAPI User Guide had some incorrect information, so I updated it with the same information here.
First of I assume you know how to include the headers and the libjs.a library in Xcode 3.2.3. The problem came when I tried to compile the simplest of applications. The fix was you have to include a #define at before the #include “jsapi.h”.
Like so:
#define XP_UNIX
#include "jsapi.h"
Also the line:
global = JS_NewGlobalObject(cx, &global_class, NULL, NULL);
was incorrect as well, it should have been:
global = JS_NewObject(cx, &global_class, NULL, NULL);
Here is the corrected code that will compile and run on Xcode 3.2.3
#define XP_UNIX
#include "jsapi.h"
/* The class of the global object. */
static JSClass global_class = {
"global", JSCLASS_GLOBAL_FLAGS,
JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
JSCLASS_NO_OPTIONAL_MEMBERS
};
/* The error reporter callback. */
void reportError(JSContext *cx, const char *message, JSErrorReport *report)
{
fprintf(stderr, "%s:%u:%s\n",
report->filename ? report->filename : "<no filename>",
(unsigned int) report->lineno,
message);
}
int main(int argc, const char *argv[])
{
/* JS variables. */
JSRuntime *rt;
JSContext *cx;
JSObject *global;
/* Create a JS runtime. */
rt = JS_NewRuntime(8L * 1024L * 1024L);
if (rt == NULL)
return 1;
/* Create a context. */
cx = JS_NewContext(rt, 8192);
if (cx == NULL)
return 1;
JS_SetOptions(cx, JSOPTION_VAROBJFIX);
//JS_SetVersion(cx, JSVERSION_LATEST);
JS_SetErrorReporter(cx, reportError);
/* Create the global object. */
global = JS_NewObject(cx, &global_class, NULL, NULL);
if (global == NULL)
return 1;
/* Populate the global object with the standard globals,
like Object and Array. */
if (!JS_InitStandardClasses(cx, global))
return 1;
//TODO app goes here
/* Cleanup. */
JS_DestroyContext(cx);
JS_DestroyRuntime(rt);
JS_ShutDown();
return 0;
}