mirror of https://github.com/lissy93/dashy
88 lines
1.9 KiB
JavaScript
88 lines
1.9 KiB
JavaScript
import { typeOf } from 'remedial';
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const trimWhitespace = (input) => input.split('\n').map(x => x.trimRight()).join('\n');
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const throwError = (msg) => {
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throw new Error(`Error in Json to YAML conversion: ${msg}`);
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};
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/* A function that converts valid JSON into valid YAML */
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const stringify = (data) => {
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let indentLevel = '';
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const handlers = {
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undefined() {
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return 'null';
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},
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null() {
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return 'null';
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},
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number(x) {
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return x;
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},
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boolean(x) {
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return x ? 'true' : 'false';
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},
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string(x) {
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return JSON.stringify(x);
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},
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array(x) {
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let output = '';
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if (x.length === 0) {
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output += '[]';
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return output;
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}
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indentLevel = indentLevel.replace(/$/, ' ');
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x.forEach((y) => {
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const handler = handlers[typeOf(y)];
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if (!handler) throwError(typeOf(y));
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output += `\n${indentLevel}- ${handler(y, true)}`;
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});
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indentLevel = indentLevel.replace(/ {2}/, '');
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return output;
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},
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object(x, inArray, rootNode) {
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let output = '';
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if (Object.keys(x).length === 0) {
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output += '{}';
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return output;
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}
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if (!rootNode) {
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indentLevel = indentLevel.replace(/$/, ' ');
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}
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Object.keys(x).forEach((k, i) => {
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const val = x[k];
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const handler = handlers[typeOf(val)];
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if (typeof val === 'undefined') {
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return;
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}
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if (!handler) throwError(typeOf(val));
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if (!(inArray && i === 0)) {
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output += `\n${indentLevel}`;
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}
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output += `${k}: ${handler(val)}`;
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});
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indentLevel = indentLevel.replace(/ {2}/, '');
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return output;
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},
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function() {
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return '[object Function]';
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},
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};
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return trimWhitespace(`${handlers[typeOf(data)](data, true, true)}\n`);
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};
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export default stringify;
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