85 lines
2.5 KiB
JavaScript
85 lines
2.5 KiB
JavaScript
const yaml = require('js-yaml');
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const Type = require('js-yaml/lib/js-yaml/type');
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const Schema = require('js-yaml/lib/js-yaml/schema');
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const { is, descriptors } = require('./utils');
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const { doc, type, requires, defaultValue } = descriptors;
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const UNDEFINED = Symbol('undefined');
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// output null as empty in yaml
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const YAML_SCHEMA = new Schema({
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include: [
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require('js-yaml/lib/js-yaml/schema/default_full')
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],
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implicit: [
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new Type('tag:yaml.org,2002:null', {
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kind: 'scalar',
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resolve(data) {
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if (data === null) {
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return true;
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}
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const max = data.length;
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return (max === 1 && data === '~') ||
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(max === 4 && (data === 'null' || data === 'Null' || data === 'NULL'));
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},
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construct: () => null,
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predicate: object => object === null,
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represent: {
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empty: function () { return ''; }
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},
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defaultStyle: 'empty'
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})
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]
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});
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function generate(spec, parentConfig = null) {
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if (!is.spec(spec)) {
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return UNDEFINED;
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}
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if (spec.hasOwnProperty(requires) && !spec[requires](parentConfig)) {
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return UNDEFINED;
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}
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if (spec.hasOwnProperty(defaultValue)) {
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return spec[defaultValue];
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}
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const types = is.array(spec[type]) ? spec[type] : [spec[type]];
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if (types.includes('object')) {
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let defaults = UNDEFINED;
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for (let key in spec) {
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if (key === '*') {
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continue;
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}
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const value = generate(spec[key], defaults);
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if (value !== UNDEFINED) {
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if (defaults === UNDEFINED) {
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defaults = {};
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}
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if (spec[key].hasOwnProperty(doc)) {
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defaults['#' + key] = spec[key][doc];
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}
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defaults[key] = value;
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}
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}
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return defaults;
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} else if (types.includes('array') && spec.hasOwnProperty('*')) {
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return [generate(spec['*'], {})];
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}
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return UNDEFINED;
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}
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class ConfigGenerator {
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constructor(spec) {
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this.spec = spec;
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}
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generate() {
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return yaml.safeDump(generate(this.spec), {
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indent: 4,
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lineWidth: 1024,
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schema: YAML_SCHEMA
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}).replace(/^(\s*)\'#.*?\':\s*\'*(.*?)\'*$/mg, '$1# $2'); // make comment lines
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}
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}
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module.exports = ConfigGenerator;
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