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fake.js - generator method for combining faker methods based on string input
*/
function Fake (faker) {
/**
* Generator method for combining faker methods based on string input
*
* __Example:__
*
* ```
* console.log(faker.fake('{{name.lastName}}, {{name.firstName}} {{name.suffix}}'));
* //outputs: "Marks, Dean Sr."
* ```
*
* This will interpolate the format string with the value of methods
* [name.lastName]{@link faker.name.lastName}, [name.firstName]{@link faker.name.firstName},
* and [name.suffix]{@link faker.name.suffix}
*
* @method faker.fake
* @param {string} str
*/
this.fake = function fake (str) {
// setup default response as empty string
var res = '';
// if incoming str parameter is not provided, return error message
if (typeof str !== 'string' || str.length === 0) {
throw new Error('string parameter is required!');
}
// find first matching {{ and }}
var start = str.search('{{');
var end = str.search('}}');
// if no {{ and }} is found, we are done
if (start === -1 && end === -1) {
return str;
}
// console.log('attempting to parse', str);
// extract method name from between the {{ }} that we found
// for example: {{name.firstName}}
var token = str.substr(start + 2, end - start - 2);
var method = token.replace('}}', '').replace('{{', '');
// console.log('method', method)
// extract method parameters
var regExp = /\(([^)]+)\)/;
var matches = regExp.exec(method);
var parameters = '';
if (matches) {
method = method.replace(regExp, '');
parameters = matches[1];
}
// split the method into module and function
var parts = method.split('.');
if (typeof faker[parts[0]] === "undefined") {
throw new Error('Invalid module: ' + parts[0]);
}
if (typeof faker[parts[0]][parts[1]] === "undefined") {
throw new Error('Invalid method: ' + parts[0] + "." + parts[1]);
}
// assign the function from the module.function namespace
var fn = faker[parts[0]][parts[1]];
// If parameters are populated here, they are always going to be of string type
// since we might actually be dealing with an object or array,
// we always attempt to the parse the incoming parameters into JSON
var params;
// Note: we experience a small performance hit here due to JSON.parse try / catch
// If anyone actually needs to optimize this specific code path, please open a support issue on github
try {
params = JSON.parse(parameters)
} catch (err) {
// since JSON.parse threw an error, assume parameters was actually a string
params = parameters;
}
var result;
if (typeof params === "string" && params.length === 0) {
result = fn.call(this);
} else {
result = fn.call(this, params);
}
// replace the found tag with the returned fake value
res = str.replace('{{' + token + '}}', result);
// return the response recursively until we are done finding all tags
return fake(res);
}
return this;
}
module['exports'] = Fake; |