[gnome-maps/wip/mlundblad/transit-plugin-opendatach: 3/4] http: Add a parameter to use array notation

[Marcus Lundblad <mlundblad src gnome org>]

commit 1e440974bb19d87f7acae61512963ea924e22be5
Author: Marcus Lundblad <ml update uu se>
Date:   Thu Nov 7 22:33:08 2019 +0100

    http: Add a parameter to use array notation
    
    Add an optional parameter to toString()
    for using array notation (adding [] to keys
    with mulitple occurancies).

 src/http.js | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/src/http.js b/src/http.js
index e90b61de..8d853fee 100644
--- a/src/http.js
+++ b/src/http.js
@@ -50,11 +50,19 @@ var Query = class Query {
             this._query[key].push(value);
     }
 
-    toString() {
+    /**
+     * Get the query parameters in string form.
+     * If useArrayNotation is given, and true, use array notation adding []
+     * after key if there's multiple values for that key.
+     */
+    toString(useArrayNotation = false) {
         let vars = [];
         for(let key in this._query) {
             let values = this._query[key];
-            let encKey = encode(key);
+            let multipleValues = values.length > 1;
+            let encKey = encode(key) + (multipleValues && useArrayNotation ?
+                                        '[]' : '');
+
             values.forEach(function(value) {
                 let encValue = encode(value);
                 if(encValue !== null)