95 lines
2.7 KiB
JavaScript
95 lines
2.7 KiB
JavaScript
/*
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* Copyright (c) 2012 Mathieu Turcotte
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* Licensed under the MIT license.
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*/
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var util = require('util');
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var errors = module.exports = require('./errors');
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function failCheck(ExceptionConstructor, callee, messageFormat, formatArgs) {
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messageFormat = messageFormat || '';
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var message = util.format.apply(this, [messageFormat].concat(formatArgs));
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var error = new ExceptionConstructor(message);
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Error.captureStackTrace(error, callee);
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throw error;
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}
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function failArgumentCheck(callee, message, formatArgs) {
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failCheck(errors.IllegalArgumentError, callee, message, formatArgs);
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}
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function failStateCheck(callee, message, formatArgs) {
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failCheck(errors.IllegalStateError, callee, message, formatArgs);
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}
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module.exports.checkArgument = function(value, message) {
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if (!value) {
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failArgumentCheck(arguments.callee, message,
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Array.prototype.slice.call(arguments, 2));
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}
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};
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module.exports.checkState = function(value, message) {
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if (!value) {
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failStateCheck(arguments.callee, message,
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Array.prototype.slice.call(arguments, 2));
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}
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};
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module.exports.checkIsDef = function(value, message) {
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if (value !== undefined) {
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return value;
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}
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failArgumentCheck(arguments.callee, message ||
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'Expected value to be defined but was undefined.',
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Array.prototype.slice.call(arguments, 2));
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};
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module.exports.checkIsDefAndNotNull = function(value, message) {
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// Note that undefined == null.
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if (value != null) {
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return value;
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}
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failArgumentCheck(arguments.callee, message ||
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'Expected value to be defined and not null but got "' +
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typeOf(value) + '".', Array.prototype.slice.call(arguments, 2));
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};
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// Fixed version of the typeOf operator which returns 'null' for null values
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// and 'array' for arrays.
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function typeOf(value) {
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var s = typeof value;
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if (s == 'object') {
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if (!value) {
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return 'null';
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} else if (value instanceof Array) {
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return 'array';
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}
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}
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return s;
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}
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function typeCheck(expect) {
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return function(value, message) {
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var type = typeOf(value);
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if (type == expect) {
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return value;
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}
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failArgumentCheck(arguments.callee, message ||
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'Expected "' + expect + '" but got "' + type + '".',
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Array.prototype.slice.call(arguments, 2));
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};
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}
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module.exports.checkIsString = typeCheck('string');
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module.exports.checkIsArray = typeCheck('array');
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module.exports.checkIsNumber = typeCheck('number');
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module.exports.checkIsBoolean = typeCheck('boolean');
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module.exports.checkIsFunction = typeCheck('function');
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module.exports.checkIsObject = typeCheck('object');
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