Add initial presets (#1)

Signed-off-by: Chris Kim <oats87g@gmail.com>

indexer/IndexContent.js

@@ -0,0 +1,52 @@
+'use strict';
+
+class IndexContent
+{
+    constructor(presetFilesArray, settings)
+    {
+        this.majorVersion = 1;
+        this.minorVersion = 0;
+        this.settings = settings;
+        this.uniqueValues = {};
+        this.presets = presetFilesArray;
+
+        this.uniqueValues.firmware_version = this._getUniqueValues(presetFilesArray, "firmware_version");
+        this.uniqueValues.category = this._getUniqueValues(presetFilesArray, "category");
+        this.uniqueValues.author = this._getUniqueValues(presetFilesArray, "author");
+        this.uniqueValues.keywords = this._getUniqueValues(presetFilesArray, "keywords");
+        this.uniqueValues.board_name = this._getUniqueValues(presetFilesArray, "board_name");
+    }
+
+    _getUniqueValues(presetFilesArray, property)
+    {
+        let result = new Set();
+        let resultLowerCase = new Set();
+
+        function addValue(value) {
+            const valueLowCase = value.toLowerCase();
+            if (!resultLowerCase.has(valueLowCase)) {
+                result.add(value);
+                resultLowerCase.add(valueLowCase);
+            }
+        }
+
+        for (let preset of presetFilesArray) {
+            if (property in preset) {
+                if (Array.isArray(preset[property])) {
+                    for (let value of preset[property]) {
+                        addValue(value);
+                    }
+                } else {
+                   addValue(preset[property]);
+                }
+            }
+        }
+
+        result = [...result];
+        result.sort((a, b) => a.localeCompare(b, undefined, {sensitivity: 'base'}));
+        return result;
+    }
+
+}
+
+module.exports = IndexContent;