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var is = require('is');
var objectPath = require('object-path');
var logged = {};
var disabled = {};
/**
Log a deprecated notice
@param {Book|Output} book
@param {String} key
@param {String} message
*/
function logNotice(book, key, message) {
if (logged[key] || disabled[key]) return;
logged[key] = true;
var logger = book.getLogger();
logger.warn.ln(message);
}
/**
Deprecate a function
@param {Book|Output} book
@param {String} key: unique identitifer for the deprecated
@param {Function} fn
@param {String} msg: message to print when called
@return {Function}
*/
function deprecateMethod(book, key, fn, msg) {
return function() {
logNotice(book, key, msg);
return fn.apply(this, arguments);
};
}
/**
Deprecate a property of an object
@param {Book|Output} book
@param {String} key: unique identitifer for the deprecated
@param {Object} instance
@param {String|Function} property
@param {String} msg: message to print when called
@return {Function}
*/
function deprecateField(book, key, instance, property, value, msg) {
var store = undefined;
var prepare = function() {
if (!is.undefined(store)) return;
if (is.fn(value)) store = value();
else store = value;
};
var getter = function(){
prepare();
logNotice(book, key, msg);
return store;
};
var setter = function(v) {
prepare();
logNotice(book, key, msg);
store = v;
return store;
};
Object.defineProperty(instance, property, {
get: getter,
set: setter,
enumerable: true,
configurable: true
});
}
/**
Enable a deprecation
@param {String} key: unique identitifer
*/
function enableDeprecation(key) {
disabled[key] = false;
}
/**
Disable a deprecation
@param {String} key: unique identitifer
*/
function disableDeprecation(key) {
disabled[key] = true;
}
/**
Deprecate a method in favor of another one
@param {Book} book
@param {String} key
@param {Object} instance
@param {String} oldName
@param {String} newName
*/
function deprecateRenamedMethod(book, key, instance, oldName, newName, msg) {
msg = msg || ('"' + oldName + '" is deprecated, use "' + newName + '()" instead');
var fn = objectPath.get(instance, newName);
instance[oldName] = deprecateMethod(book, key, fn, msg);
}
module.exports = {
method: deprecateMethod,
renamedMethod: deprecateRenamedMethod,
field: deprecateField,
enable: enableDeprecation,
disable: disableDeprecation
};
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