/**
 * Defines an access policy that allows a set of operations when the given condition is true.
 *
 * @param operation: comma-separated list of "create", "read", "update", "post-update", "delete". Use "all" to denote all operations.
 * @param condition: a boolean expression that controls if the operation should be allowed.
 */
attribute @@allow(_ operation: String @@@completionHint(["'create'", "'read'", "'update'", "'post-update'","'delete'", "'all'"]), _ condition: Boolean)

/**
 * Defines an access policy that allows the annotated field to be read or updated.
 * You can pass a third argument as `true` to make it override the model-level policies.
 *
 * @param operation: comma-separated list of "read", "update". Use "all" to denote all operations.
 * @param condition: a boolean expression that controls if the operation should be allowed.
 */
attribute @allow(_ operation: String @@@completionHint(["'read'", "'update'", "'all'"]), _ condition: Boolean)

/**
 * Defines an access policy that denies a set of operations when the given condition is true.
 *
 * @param operation: comma-separated list of "create", "read", "update", "post-update", "delete". Use "all" to denote all operations.
 * @param condition: a boolean expression that controls if the operation should be denied.
 */
attribute @@deny(_ operation: String @@@completionHint(["'create'", "'read'", "'update'", "'post-update'","'delete'", "'all'"]), _ condition: Boolean)

/**
 * Defines an access policy that denies the annotated field to be read or updated.
 *
 * @param operation: comma-separated list of "read", "update". Use "all" to denote all operations.
 * @param condition: a boolean expression that controls if the operation should be denied.
 */
attribute @deny(_ operation: String @@@completionHint(["'read'", "'update'", "'all'"]), _ condition: Boolean)

/**
 * Delegates the access control decision to a relation. Only to-one relations are supported.
 *
 * @param field: The relation field to delegate to.
 * @param operation: The operation to check access for. Can be "read", "create", "update", "post-update", or "delete". If the operation is not provided,
 * it defaults the operation of the containing policy rule.
 */
function check(field: Any, operation: String?): Boolean {
} @@@expressionContext([AccessPolicy])

/**
 * Gets entity's value before an update. Only valid when used in a "post-update" policy rule.
 */
function before(): Any {
} @@@expressionContext([AccessPolicy])

/**
 * The name of the model for which the policy rule is defined. If the rule is
 * inherited to a sub model, this function returns the name of the sub model.
 *
 * @param optional parameter to control the casing of the returned value. Valid
 * values are "original", "upper", "lower", "capitalize", "uncapitalize". Defaults
 * to "original".
 */
function currentModel(casing: String?): String {
} @@@expressionContext([AccessPolicy])

/**
 * The operation for which the policy rule is defined for. Note that a rule with
 * "all" operation is expanded to "create", "read", "update", and "delete" rules,
 * and the function returns corresponding value for each expanded version.
 *
 * @param optional parameter to control the casing of the returned value. Valid
 * values are "original", "upper", "lower", "capitalize", "uncapitalize". Defaults
 * to "original".
 */
function currentOperation(casing: String?): String {
} @@@expressionContext([AccessPolicy])