planning

node_modules/@mapbox/mapbox-gl-style-spec/format.js

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+
+import reference from './reference/latest.js';
+import stringifyPretty from 'json-stringify-pretty-compact';
+
+function sortKeysBy(obj, reference) {
+    const result = {};
+    for (const key in reference) {
+        if (obj[key] !== undefined) {
+            result[key] = obj[key];
+        }
+    }
+    for (const key in obj) {
+        if (result[key] === undefined) {
+            result[key] = obj[key];
+        }
+    }
+    return result;
+}
+
+/**
+ * Format a Mapbox GL Style.  Returns a stringified style with its keys
+ * sorted in the same order as the reference style.
+ *
+ * The optional `space` argument is passed to
+ * [`JSON.stringify`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify)
+ * to generate formatted output.
+ *
+ * If `space` is unspecified, a default of `2` spaces will be used.
+ *
+ * @private
+ * @param {Object} style a Mapbox GL Style
+ * @param {number} [space] space argument to pass to `JSON.stringify`
+ * @returns {string} stringified formatted JSON
+ * @example
+ * var fs = require('fs');
+ * var format = require('mapbox-gl-style-spec').format;
+ * var style = fs.readFileSync('./source.json', 'utf8');
+ * fs.writeFileSync('./dest.json', format(style));
+ * fs.writeFileSync('./dest.min.json', format(style, 0));
+ */
+function format(style, space = 2) {
+    style = sortKeysBy(style, reference.$root);
+
+    if (style.layers) {
+        style.layers = style.layers.map((layer) => sortKeysBy(layer, reference.layer));
+    }
+
+    return stringifyPretty(style, {indent: space});
+}
+
+export default format;