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scale.c
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scale.c
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#include "glfw.h"
#include "scale.h"
thread_local JSClassID glfw_scale_class_id = 0;
thread_local JSValue glfw_scale_proto, glfw_scale_class;
// constructor/destructor
static JSValue
glfw_scale_constructor(JSContext* ctx, JSValueConst new_target, int argc, JSValueConst argv[]) {
GLFWscale *scale, *other;
JSValue proto, obj = JS_UNDEFINED;
if(!(scale = js_mallocz(ctx, sizeof(*scale))))
return JS_EXCEPTION;
if(JS_IsObject(argv[0]) && (other = JS_GetOpaque(argv[0], glfw_scale_class_id))) {
*scale = *other;
} else {
if(JS_ToFloat64(ctx, &scale->x, argv[0])) {
JS_ThrowTypeError(ctx, "argument 1 (x-scaling) must be a number");
goto fail;
}
if(JS_ToFloat64(ctx, &scale->y, argv[1])) {
JS_ThrowTypeError(ctx, "argument 2 (y-scaling) must be a number");
goto fail;
}
}
/* using new_target to get the prototype is necessary when the class is extended. */
proto = JS_GetPropertyStr(ctx, new_target, "prototype");
if(JS_IsException(proto))
goto fail;
obj = JS_NewObjectProtoClass(ctx, proto, glfw_scale_class_id);
JS_FreeValue(ctx, proto);
if(JS_IsException(obj))
goto fail;
JS_SetOpaque(obj, scale);
return obj;
fail:
js_free(ctx, scale);
JS_FreeValue(ctx, obj);
return JS_EXCEPTION;
}
void static glfw_scale_finalizer(JSRuntime* rt, JSValue val) {
GLFWscale* scale;
if((scale = JS_GetOpaque(val, glfw_scale_class_id)))
js_free_rt(rt, scale);
}
// properties
static JSValue
glfw_scale_get(JSContext* ctx, JSValueConst this_val, int magic) {
GLFWscale* scale;
if(!(scale = JS_GetOpaque2(ctx, this_val, glfw_scale_class_id)))
return JS_EXCEPTION;
return JS_NewFloat64(ctx, magic == 0 ? scale->x : scale->y);
}
static JSValue
glfw_scale_set(JSContext* ctx, JSValueConst this_val, JSValue val, int magic) {
GLFWscale* scale;
if(!(scale = JS_GetOpaque2(ctx, this_val, glfw_scale_class_id)))
return JS_EXCEPTION;
double value;
if(JS_ToFloat64(ctx, &value, val))
return JS_EXCEPTION;
if(magic == 0)
scale->x = value;
else
scale->y = value;
return JS_UNDEFINED;
}
static JSValue
glfw_scale_iterator(JSContext* ctx, JSValueConst this_val, int argc, JSValueConst argv[]) {
GLFWscale* scale;
JSValue arr, iter, generator = JS_UNDEFINED;
JSAtom atom;
if(!(scale = JS_GetOpaque2(ctx, this_val, glfw_scale_class_id)))
return JS_EXCEPTION;
arr = JS_NewArray(ctx);
JS_SetPropertyUint32(ctx, arr, 0, JS_NewInt32(ctx, scale->x));
JS_SetPropertyUint32(ctx, arr, 1, JS_NewInt32(ctx, scale->y));
atom = js_iterator_atom(ctx);
iter = JS_GetProperty(ctx, arr, atom);
JS_FreeAtom(ctx, atom);
if(JS_IsFunction(ctx, iter))
generator = JS_Call(ctx, iter, arr, 0, 0);
JS_FreeValue(ctx, iter);
JS_FreeValue(ctx, arr);
return generator;
}
// initialization
static JSClassDef glfw_scale_class_def = {
.class_name = "Scale",
.finalizer = glfw_scale_finalizer,
};
static const JSCFunctionListEntry glfw_scale_proto_funcs[] = {
JS_CGETSET_ENUMERABLE_MAGIC_DEF("x", glfw_scale_get, glfw_scale_set, 0),
JS_CGETSET_ENUMERABLE_MAGIC_DEF("y", glfw_scale_get, glfw_scale_set, 1),
JS_CFUNC_DEF("[Symbol.iterator]", 0, glfw_scale_iterator),
JS_PROP_STRING_DEF("[Symbol.toStringTag]", "GLFWscale", JS_PROP_CONFIGURABLE),
};
int
glfw_scale_init(JSContext* ctx, JSModuleDef* m) {
JS_NewClassID(&glfw_scale_class_id);
JS_NewClass(JS_GetRuntime(ctx), glfw_scale_class_id, &glfw_scale_class_def);
glfw_scale_proto = JS_NewObject(ctx);
JS_SetPropertyFunctionList(ctx, glfw_scale_proto, glfw_scale_proto_funcs, countof(glfw_scale_proto_funcs));
JS_SetClassProto(ctx, glfw_scale_class_id, glfw_scale_proto);
glfw_scale_class = JS_NewCFunction2(ctx, glfw_scale_constructor, "Scale", 2, JS_CFUNC_constructor, 0);
/* set proto.constructor and ctor.prototype */
JS_SetConstructor(ctx, glfw_scale_class, glfw_scale_proto);
JS_SetModuleExport(ctx, m, "Scale", glfw_scale_class);
return 0;
}
JSValue
glfw_scale_wrap(JSContext* ctx, GLFWscale* scale) {
JSValue obj = JS_UNDEFINED;
JSValue proto;
proto = JS_GetPropertyStr(ctx, glfw_scale_class, "prototype");
if(JS_IsException(proto))
goto fail;
obj = JS_NewObjectProtoClass(ctx, proto, glfw_scale_class_id);
JS_FreeValue(ctx, proto);
if(JS_IsException(obj))
goto fail;
JS_SetOpaque(obj, scale);
return obj;
fail:
JS_FreeValue(ctx, obj);
return JS_EXCEPTION;
}
int
glfw_scale_export(JSContext* ctx, JSModuleDef* m) {
return JS_AddModuleExport(ctx, m, "Scale");
}