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index.js
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index.js
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//@ts-check
let assert = require('assert'),
{ AssertionError } = assert;
module.exports = {
Assert, Invoke
};
/** @param {any} value */
function Assert(value) {
let throwAssertionError = (message, expected, actual) => {
throw new AssertionError({ message, expected, actual }) };
let chains = {
get and() { return chains },
print,
isTrue, isFalse, isUndefined,
equals, equalsInJSON, fieldsEqual,
differentFrom, greaterThan, lessThan,
isString, isNumber, isObject, isTypeof,
isArray, isEmpty,
length, lengthIn,
containsKeys, containsValue, containsSubString,
doesNotContainSubString,
trim,
allKeys, allKeyValueTuples, child, sort, parseJSON, each,
convertBy,
// aliases:
field: child
};
return chains;
function print() {
console.log(value);
return chains;
}
function isTrue() { return equals(true); }
function isFalse() { return equals(false); }
function isUndefined() { return equals(undefined); }
function isString() { return isTypeof('string'); }
function isNumber() { return isTypeof('number'); }
function isObject() { return isTypeof('object'); }
/** @param {string} type */
function isTypeof(type) {
assert.deepStrictEqual(typeof value, type);
return chains;
}
function equals(expected) {
assert.deepStrictEqual(value, expected);
return chains;
}
function differentFrom(expected) {
assert.notDeepStrictEqual(value, expected);
return chains;
}
/** @type {any} */
function equalsInJSON(expected) {
assert.deepStrictEqual(JSON.stringify(value), JSON.stringify(expected));
return chains;
}
function greaterThan(expected) {
if(value > expected)
return chains;
throwAssertionError(`value is not greater than ${expected}`, `greater than ${expected}`, value);
}
function lessThan(expected) {
if(value < expected)
return chains;
throwAssertionError(`value is not less than ${expected}`, `less than ${expected}`, value);
}
/** @param {{[fieldName: string]: any}} equalMap */
function fieldsEqual(equalMap) {
for (let fieldName in equalMap)
assert.deepStrictEqual(value[fieldName], equalMap[fieldName]);
return chains;
}
function isArray() {
if (!Array.isArray(value))
throwAssertionError('Value is not an array', 'An Array', value);
return chains;
}
function isEmpty() {
let type = typeof value;
if (Array.isArray(value) || type == 'string')
return length(0);
if (type == 'number')
return equals(0);
if (type == 'object' && !value) // null
return chains;
return isUndefined();
}
/** @param {number} len */
function length(len) {
let actual = value.length;
if (typeof actual != 'number')
throwAssertionError('value.length is not a number', 'value.length is a number', value);
if (actual !== len)
throwAssertionError(`value.length != ${len}`, len, actual);
return chains;
}
/**
* length of value in range: [min, max)
* @param {number} min
* @param {number} [max]
*/
function lengthIn(min, max = Infinity) {
if (typeof value.length != 'number')
throwAssertionError('value.length is not a number', 'value.length is a number', value);
let range = `[${min}, ${max})`;
if (value.length < min)
throwAssertionError(`value.length < ${min}`, range, value.length);
if (value.length >= max)
throwAssertionError(`value.length < ${min}`, range, value.length);
return chains;
}
/** @param {string[]} keys */
function containsKeys(...keys) {
for (let k of keys)
if (!(k in value))
throwAssertionError(`\`${k}\` is missing in value`, `{ "${k}": any, ... }`, value);
return chains;
}
/** @param {any} v */
function containsValue(v) {
for (let key in value)
if (value[key] == v)
return chains;
throwAssertionError(`${JSON.stringify(v)} is missing in value`, `contains ${JSON.stringify(v)}`, value);
}
/** @param {string} subString */
function containsSubString(subString) {
isString();
if (value.indexOf(subString) < 0) {
let name = JSON.stringify(subString);
if (name.length > 100) name = name.slice(0, 95) + " ... \"";
throwAssertionError(`value doesn't contain substring`, `string contains ${name}`, value);
}
return chains;
}
/** @param {string} subString */
function doesNotContainSubString(subString) {
isString();
if (value.indexOf(subString) >= 0) {
let name = JSON.stringify(subString);
if (name.length > 100) name = name.slice(0, 95) + " ... \"";
throwAssertionError(`value contains substring`, `string doesn't contains ${name}`, value);
}
return chains;
}
function trim() {
isString();
return Assert(value.trim());
}
function allKeys() {
return Assert(Object.keys(value));
}
function allKeyValueTuples() {
return Assert(Object.keys(value).map(k => ({ k, v: value[k] })));
}
function sort() {
isArray();
return Assert(Object.assign([], value).sort());
}
/** @param {string} fieldName */
function child(fieldName) {
containsKeys(fieldName);
return Assert(value[fieldName]);
}
/** @param {(value: any, key: string) => any} handler */
function each(handler) {
for (let k in value)
handler(value[k], k);
return chains;
}
function parseJSON() {
let object = void 0;
try {
object = JSON.parse(value);
} catch (ex) {
throwAssertionError('Could not parse JSON', `A valid JSON`, `Invalid JSON: ${ex.message}`);
}
return Assert(object);
}
/** @param {(any) => any} handler */
function convertBy(handler) {
return Assert(handler(value));
}
}
/**
* @param {Function} func
* @param {any} [context]
* @param {any[]} [parameters]
*/
function Invoke(func, context, ...parameters) {
let invokeExpression = `${func.name}(${parameters.map(p=>JSON.stringify(p)).join(', ')})`;
let value = undefined,
exception = undefined;
try {
value = func.call(context, ...parameters);
} catch (e) {
exception = e;
}
let chains = Object.assign({ hasException }, Assert(value));
if (typeof exception != 'undefined') {
let throwAgain = (originalCheckerName) => {
throw new AssertionError({
message: `${invokeExpression} thrown an exception`,
expected: originalCheckerName,
actual: 'message' in exception ? exception.message : exception
});
};
for (let funcName in chains)
if (funcName != hasException.name)
chains[funcName] = throwAgain.bind(this, funcName);
}
return chains;
function hasException(keyword = '') {
let expected = keyword ? `An exception has keyword "${keyword}"` : `An exception`;
if (typeof exception == 'undefined') {
throw new AssertionError({
message: `${invokeExpression} didn't thrown an exception`,
expected, actual: 'No exception'
});
}
if (keyword) {
let message = String('message' in exception ? exception.message : exception);
if (message.toLowerCase().indexOf(keyword.toLowerCase()) < 0)
throw new AssertionError({
message: `${invokeExpression} thrown an exception without keyword`,
expected, actual: `An exception with message: ${JSON.stringify(message)}`
})
}
// OK
}
}