json2yaml.js/index.js

94 lines
2.5 KiB
JavaScript

(function () {
"use strict";
var typeOf = require('remedial').typeOf
;
function stringify(data) {
var handlers
, indentLevel = ''
;
handlers = {
"undefined": function () {
// objects will not have `undefined` converted to `null`
// as this may have unintended consequences
// For arrays, however, this behavior seems appropriate
return 'null';
}
, "null": function () {
return 'null';
}
, "number": function (x) {
return x;
}
, "boolean": function (x) {
return x ? 'true' : 'false';
}
, "string": function (x) {
// to avoid the string "true" being confused with the
// the literal `true`, we always wrap strings in quotes
return JSON.stringify(x);
}
, "array": function (x) {
var output = ''
;
indentLevel = indentLevel.replace(/$/, ' ');
x.forEach(function (y) {
// TODO how should `undefined` be handled?
var handler = handlers[typeOf(y)]
;
if (!handler) {
throw new Error('what the crap: ' + typeOf(y));
}
output += '\n' + indentLevel + '- ' + handler(y);
});
indentLevel = indentLevel.replace(/ /, '');
return output;
}
, "object": function (x) {
var output = ''
;
indentLevel = indentLevel.replace(/$/, ' ');
Object.keys(x).forEach(function (k) {
var val = x[k]
, handler = handlers[typeOf(val)]
;
if ('undefined' === typeof val) {
// the user should do
// delete obj.key
// and not
// obj.key = undefined
// but we'll error on the side of caution
return;
}
if (!handler) {
throw new Error('what the crap: ' + typeOf(val));
}
output += '\n' + indentLevel + k + ': ' + handler(val);
});
indentLevel = indentLevel.replace(/ /, '');
return output;
}
, "function": function () {
// TODO this should throw or otherwise be ignored
return '[object Function]';
}
};
return '---' + handlers[typeOf(data)](data) + '\n';
}
module.exports.stringify = stringify;
}());