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ant/examples/embed/embed.c
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embed.c
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/**
* Ant JavaScript Engine - Embedding Example
* This demonstrates how to embed the Ant JS engine in a C application.
*
* to build:
* ./libant/build.sh
* ./libant/example.sh
*
* to run:
* ./libant/dist/embed
*/
#include <ant.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define SEPARATOR "════════════════════════════════════════════════════════════"
#define SUBSEP "────────────────────────────────────────────────────────────"
static void print_header(int num, const char *title) {
printf("\n%s\n", SEPARATOR);
printf(" Example %d: %s\n", num, title);
printf("%s\n\n", SUBSEP);
}
static struct js *create_js_runtime(void *stack_base) {
struct js *js = js_create_dynamic(0, 0);
if (!js) {
fprintf(stderr, "Failed to create JS runtime\n");
return NULL;
}
js_setstackbase(js, stack_base);
static char *default_argv[] = { "embed_example", NULL };
ant_runtime_init(js, 1, default_argv, NULL);
return js;
}
static void example_basic_eval(void) {
print_header(1, "Basic Evaluation");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
js_mkscope(js);
const char *code = "1 + 2 * 3";
jsval_t result = js_eval(js, code, strlen(code));
if (vtype(result) == T_NUM) {
printf(" Result: %g\n", js_getnum(result));
} else if (vtype(result) == T_ERR) {
printf(" Error: %s\n", js_str(js, result));
}
js_destroy(js);
}
static jsval_t my_add(struct js *js, jsval_t *args, int nargs) {
if (!js_chkargs(args, nargs, "dd")) {
return js_mkerr(js, "add() expects two numbers");
}
double a = js_getnum(args[0]);
double b = js_getnum(args[1]);
return js_mknum(a + b);
}
static jsval_t my_greet(struct js *js, jsval_t *args, int nargs) {
if (nargs < 1 || vtype(args[0]) != T_STR) {
return js_mkerr(js, "greet() expects a string");
}
size_t len;
char *name = js_getstr(js, args[0], &len);
char buf[256];
snprintf(buf, sizeof(buf), "Hello, %s!", name);
return js_mkstr(js, buf, strlen(buf));
}
static jsval_t my_create_point(struct js *js, jsval_t *args, int nargs) {
if (!js_chkargs(args, nargs, "dd")) {
return js_mkerr(js, "createPoint() expects two numbers");
}
jsval_t obj = js_mkobj(js);
js_set(js, obj, "x", args[0]);
js_set(js, obj, "y", args[1]);
return obj;
}
static void example_c_functions(void) {
print_header(2, "C Functions");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
js_mkscope(js);
jsval_t global = js_glob(js);
js_set(js, global, "add", js_mkfun(my_add));
js_set(js, global, "greet", js_mkfun(my_greet));
js_set(js, global, "createPoint", js_mkfun(my_create_point));
const char *code1 = "add(10, 32)";
jsval_t r1 = js_eval(js, code1, strlen(code1));
printf(" add(10, 32) = %g\n", js_getnum(r1));
const char *code2 = "greet('World')";
jsval_t r2 = js_eval(js, code2, strlen(code2));
printf(" greet('World') = %s\n", js_str(js, r2));
const char *code3 = "let p = createPoint(3, 4); p.x * p.x + p.y * p.y";
jsval_t r3 = js_eval(js, code3, strlen(code3));
printf(" distance² = %g\n", js_getnum(r3));
js_destroy(js);
}
static void example_objects_arrays(void) {
print_header(3, "Objects and Arrays");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
js_mkscope(js);
jsval_t global = js_glob(js);
jsval_t config = js_mkobj(js);
js_set(js, config, "debug", js_true);
js_set(js, config, "version", js_mknum(1.0));
js_set(js, config, "name", js_mkstr(js, "MyApp", 5));
js_set(js, global, "config", config);
jsval_t arr = js_mkarr(js);
js_arr_push(js, arr, js_mknum(10));
js_arr_push(js, arr, js_mknum(20));
js_arr_push(js, arr, js_mknum(30));
js_set(js, global, "numbers", arr);
const char *code = "config.name + ' v' + config.version + ' - sum: ' + numbers.reduce((a,b) => a+b, 0)";
jsval_t result = js_eval(js, code, strlen(code));
printf(" Result: %s\n", js_str(js, result));
jsval_t name_val = js_get(js, config, "name");
printf(" config.name: %s\n", js_str(js, name_val));
jsval_t debug_val = js_get(js, config, "debug");
printf(" config.debug: %s\n", js_str(js, debug_val));
js_destroy(js);
}
static void example_error_handling(void) {
print_header(4, "Error Handling");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
js_mkscope(js);
const char *bad_code = "let x = {";
jsval_t r1 = js_eval(js, bad_code, strlen(bad_code));
if (vtype(r1) == T_ERR) {
printf(" Syntax error: %s\n", js_str(js, r1));
}
const char *ref_err = "undefinedVariable + 1";
jsval_t r2 = js_eval(js, ref_err, strlen(ref_err));
if (vtype(r2) == T_ERR) {
printf(" Reference error: %s\n", js_str(js, r2));
}
jsval_t global = js_glob(js);
js_set(js, global, "add", js_mkfun(my_add));
const char *type_err = "add('not', 'numbers')";
jsval_t r3 = js_eval(js, type_err, strlen(type_err));
if (vtype(r3) == T_ERR) {
printf(" Type error: %s\n", js_str(js, r3));
}
js_destroy(js);
}
static void example_call_js_from_c(void) {
print_header(5, "Calling JS from C");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
jsval_t scope = js_mkscope(js);
const char *code =
"function multiply(a, b) {"
" return a * b;"
"}"
"function formatName(first, last) {"
" return last + ', ' + first;"
"}";
js_eval(js, code, strlen(code));
jsval_t multiply_fn = js_get(js, scope, "multiply");
jsval_t format_fn = js_get(js, scope, "formatName");
jsval_t args1[] = { js_mknum(6), js_mknum(7) };
jsval_t result1 = js_call(js, multiply_fn, args1, 2);
printf(" multiply(6, 7) = %g\n", js_getnum(result1));
jsval_t args2[] = {
js_mkstr(js, "John", 4),
js_mkstr(js, "Doe", 3)
};
jsval_t result2 = js_call(js, format_fn, args2, 2);
printf(" formatName('John', 'Doe') = %s\n", js_str(js, result2));
js_destroy(js);
}
static void example_iterate_properties(void) {
print_header(6, "Iterating Properties");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
js_mkscope(js);
const char *code = "({ name: 'Alice', age: 30, city: 'NYC' })";
jsval_t obj = js_eval(js, code, strlen(code));
ant_iter_t iter = js_prop_iter_begin(js, obj);
const char *key;
size_t key_len;
jsval_t value;
printf(" Object properties:\n");
while (js_prop_iter_next(&iter, &key, &key_len, &value)) {
printf(" • %.*s = %s\n", (int)key_len, key, js_str(js, value));
}
js_prop_iter_end(&iter);
js_destroy(js);
}
static jsval_t method_get_full_name(struct js *js, jsval_t *args, int nargs) {
(void)args; (void)nargs;
jsval_t this_obj = js_getthis(js);
jsval_t first = js_get(js, this_obj, "firstName");
jsval_t last = js_get(js, this_obj, "lastName");
size_t first_len, last_len;
char *first_str = js_getstr(js, first, &first_len);
char *last_str = js_getstr(js, last, &last_len);
char buf[256];
snprintf(buf, sizeof(buf), "%s %s", first_str, last_str);
return js_mkstr(js, buf, strlen(buf));
}
static void example_this_context(void) {
print_header(7, "'this' Context");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
js_mkscope(js);
jsval_t person = js_mkobj(js);
js_set(js, person, "firstName", js_mkstr(js, "Jane", 4));
js_set(js, person, "lastName", js_mkstr(js, "Smith", 5));
js_set(js, person, "getFullName", js_mkfun(method_get_full_name));
js_set(js, js_glob(js), "person", person);
const char *code = "person.getFullName()";
jsval_t result = js_eval(js, code, strlen(code));
printf(" person.getFullName() = %s\n", js_str(js, result));
js_destroy(js);
}
static void example_stateful_session(void) {
print_header(8, "Stateful Session");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
js_mkscope(js);
const char *scripts[] = {
"let counter = 0;",
"function increment() { return ++counter; }",
"function getCount() { return counter; }",
"increment(); increment(); increment();",
"getCount()"
};
jsval_t result = js_mkundef();
for (int i = 0; i < 5; i++) {
result = js_eval(js, scripts[i], strlen(scripts[i]));
if (vtype(result) == T_ERR) {
printf(" Error in script %d: %s\n", i, js_str(js, result));
break;
}
}
printf(" Final count: %g\n", js_getnum(result));
js_destroy(js);
}
static void example_async_event_loop(void) {
print_header(9, "Async & Event Loop");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
init_symbol_module();
init_builtin_module();
init_timer_module();
jsval_t scope = js_mkscope(js);
const char *code =
"let results = [];"
""
"setTimeout(() => {"
" results.push('timer 1 (50ms)');"
"}, 50);"
""
"setTimeout(() => {"
" results.push('timer 2 (10ms)');"
"}, 10);"
""
"Promise.resolve('promise 1').then(v => {"
" results.push(v);"
"});"
""
"queueMicrotask(() => {"
" results.push('microtask');"
"});"
""
"results.push('sync');";
jsval_t result = js_eval(js, code, strlen(code));
if (vtype(result) == T_ERR) {
printf(" Error: %s\n", js_str(js, result));
js_destroy(js);
return;
}
js_run_event_loop(js);
jsval_t results = js_get(js, scope, "results");
printf(" Execution order:\n");
jsoff_t len = js_arr_len(js, results);
for (jsoff_t i = 0; i < len; i++) {
jsval_t item = js_arr_get(js, results, i);
printf(" %llu. %s\n", (unsigned long long)i + 1, js_str(js, item));
}
js_destroy(js);
}
static void example_console_logging(void) {
print_header(10, "Console Logging");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
init_console_module();
js_mkscope(js);
const char *code =
"console.log('Hello from JavaScript!');"
"console.log('Number:', 42, 'Boolean:', true);"
"console.log('Object:', { name: 'test', value: 123 });"
"console.log('Array:', [1, 2, 3]);"
"console.warn('This is a warning');"
"console.error('This is an error');"
"'done'";
jsval_t result = js_eval(js, code, strlen(code));
if (vtype(result) == T_ERR) {
printf(" Error: %s\n", js_str(js, result));
}
js_destroy(js);
}
static void example_global_this(void) {
print_header(11, "GlobalThis");
volatile char stack_base;
struct js *js = create_js_runtime((void *)&stack_base);
if (!js) return;
init_console_module();
js_mkscope(js);
jsval_t global = js_glob(js);
js_set(js, global, "myNumber", js_mknum(42));
js_set(js, global, "myString", js_mkstr(js, "hello from C", 12));
js_set(js, global, "myBool", js_true);
jsval_t myObj = js_mkobj(js);
js_set(js, myObj, "a", js_mknum(1));
js_set(js, myObj, "b", js_mknum(2));
js_set(js, global, "myObject", myObj);
const char *code =
"console.log('globalThis.myNumber:', globalThis.myNumber);"
"console.log('globalThis.myString:', globalThis.myString);"
"console.log('globalThis.myBool:', globalThis.myBool);"
"console.log('globalThis.myObject:', globalThis.myObject);"
""
"globalThis.addedFromJS = 'I was added from JavaScript';"
"console.log('globalThis.addedFromJS:', globalThis.addedFromJS);"
""
"console.log('\\nAll custom globals:');"
"console.log(' myNumber:', myNumber);"
"console.log(' myString:', myString);"
"console.log(' myBool:', myBool);"
"console.log(' myObject:', myObject);"
"console.log(' addedFromJS:', addedFromJS);"
"console.log(this)";
jsval_t result = js_eval(js, code, strlen(code));
if (vtype(result) == T_ERR) {
printf(" Error: %s\n", js_str(js, result));
}
jsval_t added = js_get(js, global, "addedFromJS");
printf("\n Read from C: addedFromJS = %s\n", js_str(js, added));
js_destroy(js);
}
int main(void) {
printf("\n%s\n", SEPARATOR);
printf(" Ant JavaScript Engine - Embedding Examples\n");
printf("%s\n", SEPARATOR);
example_basic_eval();
example_c_functions();
example_objects_arrays();
example_error_handling();
example_call_js_from_c();
example_iterate_properties();
example_this_context();
example_stateful_session();
example_async_event_loop();
example_console_logging();
example_global_this();
return EXIT_SUCCESS;
}

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