WIP

server/src/lib/LogicEvaluation/QueryParser.js

@@ -0,0 +1,61 @@
+import { OPERATION } from './Parser';
+
+export default class QueryParser {
+
+  constructor(tree, queries) {
+    this.tree = tree;
+    this.queries = queries;
+    this.query = null;
+  }
+
+  setQuery(query) {
+    this.query = query.clone();
+  }
+
+  parse() {
+    return this.parseNode(this.tree);
+  }
+
+  parseNode(node) {
+    if (typeof node === 'string') {
+      const nodeQuery = this.getQuery(node);
+      return (query) => { nodeQuery(query); };
+    }
+    if (OPERATION[node.operation] === undefined) {
+      throw new Error(`unknow expression ${node.operation}`);
+    }
+    const leftQuery = this.getQuery(node.left);
+    const rightQuery = this.getQuery(node.right);
+
+    switch (node.operation) {
+      case '&&':
+      case 'AND':
+      default:
+        return (nodeQuery) => nodeQuery.where((query) => {
+          query.where((q) => { leftQuery(q); });
+          query.andWhere((q) => { rightQuery(q); });
+        });
+      case '||':
+      case 'OR':
+        return (nodeQuery) => nodeQuery.where((query) => {
+          query.where((q) => { leftQuery(q); });
+          query.orWhere((q) => { rightQuery(q); });
+        });
+    }
+  }
+
+  getQuery(node) {
+    if (typeof node !== 'string' && node !== null) {
+      return this.parseNode(node);
+    }
+    const value = parseFloat(node);
+
+    if (!isNaN(value)) {
+      if (typeof this.queries[node] === 'undefined') {
+        throw new Error(`unknow query under index ${node}`);
+      }
+      return this.queries[node];
+    }
+    return null;
+  }
+}