C++ duk_safe_to_string函数代码示例

static duk_ret_t duk_android_log_print(duk_context *ctx) {
	int n = duk_get_top(ctx);
	switch (n) {
	case 1:
		LOGD("ScriptEngine", "%s", duk_safe_to_string(ctx, 0));
		break;
	case 2:
		LOGD("ScriptEngine", "%s %s", duk_safe_to_string(ctx, 0),
				duk_safe_to_string(ctx, 1));
		break;
	case 3:
		LOGD("ScriptEngine", "%s %s %s", duk_safe_to_string(ctx, 0),
				duk_safe_to_string(ctx, 1), duk_safe_to_string(ctx, 2));
		break;
	case 4: {
		LOGD("ScriptEngine", "%s %s %s %s", duk_safe_to_string(ctx, 0),
				duk_safe_to_string(ctx, 1), duk_safe_to_string(ctx, 2),
				duk_safe_to_string(ctx, 3));
	     }
		break;
	case 0: {
		LOGD("ScriptEngine", "\n");
	}
		break;
	default: {
		LOGW("ScriptEngine",
				"too many args %d to print, javascript print only support less than 4 args\n",
				n);
	}
		break;
	}
	return 0;
}

int main(int argc, const char *argv[]) {
    duk_context *ctx = NULL;

    ctx = duk_create_heap_default();
    if (!ctx) {
        printf("Failed to create a Duktape heap.\n");
        exit(1);
    }

    duk_push_global_object(ctx);
    duk_push_c_function(ctx, native_prime_check, 2 /*nargs*/);
    duk_put_prop_string(ctx, -2, "primeCheckNative");

    if (duk_peval_file(ctx, "prime.js") != 0) {
        printf("Error: %s\n", duk_safe_to_string(ctx, -1));
        goto finished;
    }
    duk_pop(ctx);  /* ignore result */

    duk_get_prop_string(ctx, -1, "primeTest");
    if (duk_pcall(ctx, 0) != 0) {
        printf("Error: %s\n", duk_safe_to_string(ctx, -1));
    }
    duk_pop(ctx);  /* ignore result */

 finished:
    duk_destroy_heap(ctx);

    exit(0);
}

DUK_EXTERNAL int sjs_vm_eval_code(const sjs_vm_t* vm, const char* filename, const char* code, size_t len, FILE* foutput, FILE* ferror) {
    int r;

    assert(vm);
    duk_context* ctx = vm->ctx;

    duk_push_pointer(ctx, (void *) code);
    duk_push_uint(ctx, len);
    duk_push_string(ctx, filename);

    r = duk_safe_call(ctx, sjs__compile_execute, 3 /*nargs*/, 1 /*nret*/);
    if (r != DUK_EXEC_SUCCESS) {
        if (ferror) {
            duk_safe_call(ctx, sjs__get_error_stack, 1 /*nargs*/, 1 /*nrets*/);
            fprintf(ferror, "%s\n", duk_safe_to_string(ctx, -1));
            fflush(ferror);
        }
    } else {
        if (foutput) {
            fprintf(foutput, "= %s\n", duk_safe_to_string(ctx, -1));
            fflush(foutput);
        }
    }

    duk_pop(ctx);
    return r;
}

static duk_ret_t test_is_prototype_of(duk_context *ctx, void *udata) {
	(void) udata;

	prep(ctx);

	/* obj0.isPrototypeOf(dummy) -> false, traverses prototype chain of dummy */
	duk_eval_string(ctx, "Object.prototype.isPrototypeOf");
	duk_dup(ctx, 0);
	duk_push_object(ctx);
	duk_call_method(ctx, 1);
	printf("Object.prototype.isPrototypeOf result: %s\n", duk_safe_to_string(ctx, -1));
	duk_pop(ctx);

	/* obj0.isPrototypeOf(obj1) -> true, traverses prototype chain of obj1 */
	duk_eval_string(ctx, "Object.prototype.isPrototypeOf");
	duk_dup(ctx, 0);
	duk_dup(ctx, 1);
	duk_call_method(ctx, 1);
	printf("Object.prototype.isPrototypeOf result: %s\n", duk_safe_to_string(ctx, -1));
	duk_pop(ctx);

	/* dummy.isPrototypeOf(obj0) -> traverses prototype chain of obj0 and throws */
	duk_eval_string(ctx, "Object.prototype.isPrototypeOf");
	duk_push_object(ctx);
	duk_dup(ctx, 0);
	duk_call_method(ctx, 1);
	printf("Object.prototype.isPrototypeOf result: %s\n", duk_safe_to_string(ctx, -1));
	duk_pop(ctx);

	return 0;
}

int main(int argc, const char *argv[]) {
    duk_context *ctx = NULL;
    char line[4096];
    size_t idx;
    int ch;

    (void) argc; (void) argv;

    ctx = duk_create_heap_default();
    if (!ctx) {
        printf("Failed to create a Duktape heap.\n");
        exit(1);
    }

    push_file_as_string(ctx, "process.js");
    if (duk_peval(ctx) != 0) {
        printf("Error: %s\n", duk_safe_to_string(ctx, -1));
        goto finished;
    }
    duk_pop(ctx);  /* ignore result */

    memset(line, 0, sizeof(line));
    idx = 0;
    for (;;) {
        if (idx >= sizeof(line)) {
            printf("Line too long\n");
            exit(1);
        }

        ch = fgetc(stdin);
        if (ch == 0x0a) {
            line[idx++] = '\0';

            duk_push_global_object(ctx);
            duk_get_prop_string(ctx, -1 /*index*/, "processLine");
            duk_push_string(ctx, line);
            if (duk_pcall(ctx, 1 /*nargs*/) != 0) {
                printf("Error: %s\n", duk_safe_to_string(ctx, -1));
            } else {
                printf("%s\n", duk_safe_to_string(ctx, -1));
            }
            duk_pop(ctx);  /* pop result/error */

            idx = 0;
        } else if (ch == EOF) {
            break;
        } else {
            line[idx++] = (char) ch;
        }
    }

 finished:
    duk_destroy_heap(ctx);

    exit(0);
}

void test(duk_context *ctx) {
	duk_int_t rc;

	/* From API doc */
	duk_push_string(ctx, "print('Hello world!'); 123;");
	duk_eval(ctx);
	printf("return value is: %lf\n", duk_get_number(ctx, -1));
	duk_pop(ctx);

	/* Function expression */
	duk_push_string(ctx, "(function adder(x,y) { return x+y; })");
	duk_eval(ctx);  /* [ func ] */
	duk_push_int(ctx, 123);
	duk_push_int(ctx, 234);
	duk_call(ctx, 2);  /* [ func 123 234 ] -> [ result ] */
	printf("adder(123, 234) -> %lf\n", duk_get_number(ctx, -1));
	duk_pop(ctx);

	/* Protected eval with success */
	duk_push_string(ctx, "print('Hello world!'); 123;");
	rc = duk_peval(ctx);
	printf("return value is: %s (rc=%d)\n", duk_safe_to_string(ctx, -1), (int) rc);
	duk_pop(ctx);

	/* Protected eval with failure */
	duk_push_string(ctx, "throw new Error('eval error');");
	rc = duk_peval(ctx);
	printf("return value is: %s (rc=%d)\n", duk_safe_to_string(ctx, -1), (int) rc);
	duk_pop(ctx);

	/* Protected eval with syntax error */
	duk_push_string(ctx, "obj = {");
	rc = duk_peval(ctx);
	printf("return value is: %s (rc=%d)\n", duk_safe_to_string(ctx, -1), (int) rc);
	duk_pop(ctx);

	/* Plain eval with no result */
	printf("top=%ld\n", (long) duk_get_top(ctx));
	duk_push_string(ctx, "print('doing eval');");
	duk_eval_noresult(ctx);

	/* Protected eval with no result, no error */
	printf("top=%ld\n", (long) duk_get_top(ctx));
	duk_push_string(ctx, "print('doing peval');");
	rc = duk_peval_noresult(ctx);
	printf("rc=%d\n", (int) rc);

	/* Protected eval with no result, syntax error */
	printf("top=%ld\n", (long) duk_get_top(ctx));
	duk_push_string(ctx, "print('doing peval'); obj = {");
	rc = duk_peval_noresult(ctx);
	printf("rc=%d\n", (int) rc);

	printf("top: %ld\n", (long) duk_get_top(ctx));
}

bool StyleContext::evalFunction(FunctionID id) {
    // Get all functions (array) in context
    if (!duk_get_global_string(m_ctx, FUNC_ID)) {
        LOGE("EvalFilterFn - functions array not initialized");
        duk_pop(m_ctx); // pop [undefined] sitting at stack top
        return false;
    }

    // Get function at index `id` from functions array, put it at stack top
    if (!duk_get_prop_index(m_ctx, -1, id)) {
        LOGE("EvalFilterFn - function %d not set", id);
        duk_pop(m_ctx); // pop "undefined" sitting at stack top
        duk_pop(m_ctx); // pop functions (array) now sitting at stack top
        return false;
    }

    // pop fns array
    duk_remove(m_ctx, -2);

    // call popped function (sitting at stack top), evaluated value is put on stack top
    if (duk_pcall(m_ctx, 0) != 0) {
        LOGE("EvalFilterFn: %s", duk_safe_to_string(m_ctx, -1));
        duk_pop(m_ctx);
        return false;
    }

    return true;
}

bool StyleContext::setFunctions(const std::vector<std::string>& _functions) {

    auto arr_idx = duk_push_array(m_ctx);
    int id = 0;

    bool ok = true;

    for (auto& function : _functions) {
        duk_push_string(m_ctx, function.c_str());
        duk_push_string(m_ctx, "");

        if (duk_pcompile(m_ctx, DUK_COMPILE_FUNCTION) == 0) {
            duk_put_prop_index(m_ctx, arr_idx, id);
        } else {
            LOGW("Compile failed: %s\n%s\n---",
                 duk_safe_to_string(m_ctx, -1),
                 function.c_str());
            duk_pop(m_ctx);
            ok = false;
        }
        id++;
    }

    if (!duk_put_global_string(m_ctx, FUNC_ID)) {
        LOGE("'fns' object not set");
    }

    DUMP("setFunctions\n");
    return ok;
}

/*
 * Evaluate a string as Duktape code in the selected heap.
 * Usage: eval token code
 * Return value: the result of the evaluation coerced to string.
 * Side effects: may change the Duktape interpreter heap.
 */
static int
Eval_Cmd(ClientData cdata, Tcl_Interp *interp, int objc, Tcl_Obj *const objv[])
{
    duk_context *ctx;
    duk_int_t duk_result;
    const char *js_code;

    if (objc != 3) {
        Tcl_WrongNumArgs(interp, 1, objv, USAGE_EVAL);
        return TCL_ERROR;
    }

    ctx = parse_id(cdata, interp, objv[1], 0);
    if (ctx == NULL) {
        return TCL_ERROR;
    }

    js_code = Tcl_GetString(objv[2]);

    duk_result = duk_peval_string(ctx, js_code);

    Tcl_SetObjResult(interp,
            Tcl_NewStringObj(
                duk_safe_to_string(ctx, -1), -1));
    duk_pop(ctx);

    if (duk_result == 0) {
        return TCL_OK;
    } else {
        return TCL_ERROR;
    }
}

DUK_EXTERNAL void duk_push_context_dump(duk_context *ctx) {
	duk_idx_t idx;
	duk_idx_t top;

	/* We don't duk_require_stack() here now, but rely on the caller having
	 * enough space.
	 */

	top = duk_get_top(ctx);
	duk_push_array(ctx);
	for (idx = 0; idx < top; idx++) {
		duk_dup(ctx, idx);
		duk_put_prop_index(ctx, -2, idx);
	}

	/* XXX: conversion errors should not propagate outwards.
	 * Perhaps values need to be coerced individually?
	 */
	duk_bi_json_stringify_helper(ctx,
	                             duk_get_top_index(ctx),  /*idx_value*/
	                             DUK_INVALID_INDEX,  /*idx_replacer*/
	                             DUK_INVALID_INDEX,  /*idx_space*/
	                             DUK_JSON_FLAG_EXT_CUSTOM |
	                             DUK_JSON_FLAG_ASCII_ONLY |
	                             DUK_JSON_FLAG_AVOID_KEY_QUOTES /*flags*/);

	duk_push_sprintf(ctx, "ctx: top=%ld, stack=%s", (long) top, (const char *) duk_safe_to_string(ctx, -1));
	duk_replace(ctx, -3);  /* [ ... arr jsonx(arr) res ] -> [ ... res jsonx(arr) ] */
	duk_pop(ctx);
	DUK_ASSERT(duk_is_string(ctx, -1));
}

static duk_ret_t test_basic(duk_context *ctx, void *udata) {
	duk_idx_t i, n;
	duk_int_t rc;

	(void) udata;

	duk_push_undefined(ctx);
	duk_push_null(ctx);
	duk_push_true(ctx);
	duk_push_false(ctx);
	duk_push_string(ctx, "foo");
	duk_push_int(ctx, 123);
	duk_push_object(ctx);
	duk_push_pointer(ctx, (void *) NULL);
	duk_push_pointer(ctx, (void *) 0xdeadbeefUL);

	n = duk_get_top(ctx);
	printf("top: %ld\n", (long) n);
	for (i = 0; i <= n; i++) {
		rc = duk_safe_call(ctx, safe_helper, (void *) i, 0, 1);
		if (rc != DUK_EXEC_SUCCESS) {
			printf("index %ld: %s\n", (long) i, duk_safe_to_string(ctx, -1));
		}
		duk_pop(ctx);
	}

	printf("final top: %ld\n", (long) duk_get_top(ctx));
	return 0;
}

/* Basic dump/load test which exercises all constant types and has an inner
 * function.  Hex dumping the bytecode provides an exact test case dependency
 * to the dump format so that any accidental changes break the test.
 */
static duk_ret_t test_basic(duk_context *ctx) {
	unsigned char *p;
	duk_size_t i, sz;

	/* Integer constants generate LDINT now so also use a fractional
	 * constant to exercise number constants.
	 *
	 * Compiled as a program; force source filename.
	 */
	duk_push_string(ctx, "print('hello', (function adder(x,y) { return x+y; })(1, 2), 3.14);");
	duk_push_string(ctx, "fakeFilename.js");
	duk_compile(ctx, 0);
	duk_dump_function(ctx);
	printf("dump result type: %d\n", (int) duk_get_type(ctx, -1));
	fflush(stdout);
	p = (unsigned char *) duk_get_buffer(ctx, -1, &sz);
	for (i = 0; i < sz; i++) {
		printf("%02x", (int) p[i]);
	}
	printf("\n");
	fflush(stdout);

	/* Load test function from dump and execute it. */
	duk_load_function(ctx);
	printf("load result type: %d\n", (int) duk_get_type(ctx, -1));
	fflush(stdout);
	duk_call(ctx, 0);
	printf("call result type: %d\n", (int) duk_get_type(ctx, -1));
	fflush(stdout);
	printf("call result: %s\n", duk_safe_to_string(ctx, -1));

	printf("final top: %ld\n", (long) duk_get_top(ctx));
	return 0;
}

Variant DuktapeScriptFunction::call(const std::vector<Variant> & args)
{
    // Get function wrapper from stash
    duk_push_global_stash(m_context);
    duk_get_prop_index(m_context, -1, m_stashIndex);

    // Push arguments
    for (Variant var : args)
    {
        m_scriptBackend->pushToDukStack(var);
    }

    // Call function
    duk_int_t error = duk_pcall(m_context, args.size());

    // Check for error
    if (error)
    {
        // Raise script exception
        m_scriptBackend->m_scriptContext->scriptException(std::string(duk_safe_to_string(m_context, -1)));
        duk_pop_2(m_context);
        return Variant();
    }

    // Convert return value
    Variant value = m_scriptBackend->fromDukStack(-1);
    duk_pop_2(m_context);
    return value;
}

/* Custom internal prototype is lost during a dump/load. */
static duk_ret_t test_internal_prototype_lost(duk_context *ctx) {
	duk_eval_string(ctx,
		"(function () {\n"
		"    var f = function test() {};\n"
		"    Object.setPrototypeOf(f, { myProperty: 'myValue' });\n"
		"    print(f.myProperty);\n"
		"    return f;\n"
		"})()");
	duk_dump_function(ctx);
	duk_load_function(ctx);

	duk_get_prop_string(ctx, -1, "myProperty");
	printf("myProperty: %s\n", duk_safe_to_string(ctx, -1));
	duk_pop(ctx);

	duk_get_prototype(ctx, -1);
	duk_eval_string(ctx, "Function.prototype");
	printf("f prototype is Function.prototype: %d\n", (int) duk_strict_equals(ctx, -1, -2));
	duk_pop_2(ctx);

	duk_pop(ctx);

	printf("final top: %ld\n", (long) duk_get_top(ctx));
	return 0;
}

void StyleContext::initFunctions(const Scene& _scene) {

    if (_scene.id == m_sceneId) {
        return;
    }
    m_sceneId = _scene.id;

    auto arr_idx = duk_push_array(m_ctx);
    int id = 0;

    for (auto& function : _scene.functions()) {
        //logMsg("compile '%s'\n", function.c_str());
        duk_push_string(m_ctx, function.c_str());
        duk_push_string(m_ctx, "");

        if (duk_pcompile(m_ctx, DUK_COMPILE_FUNCTION) == 0) {
            duk_put_prop_index(m_ctx, arr_idx, id);
        } else {
            logMsg("Error: compile failed: %s\n", duk_safe_to_string(m_ctx, -1));
            duk_pop(m_ctx);
        }
        id++;
    }

    if (!duk_put_global_string(m_ctx, FUNC_ID)) {
        logMsg("Error: 'fns' object not set\n");
    }

    DUMP("setScene - %d functions\n", id);
}