1 files changed, 29 insertions, 0 deletions
diff --git a/source/client/helper.ts b/source/client/helper.ts
index 19c4f46..9fb4052 100644
--- a/source/client/helper.ts
+++ b/source/client/helper.ts
@@ -1,3 +1,5 @@
+import { parameters } from "."
+
 export function get_query_params(): { [key: string]: string } {
     const q: { [key: string]: string } = {}
     for (const kv of window.location.search.substr(1).split("&")) {
@@ -12,3 +14,30 @@ export function hex_id(len: number = 8): string {
     return Math.floor(Math.random() * 16 ** len).toString(16).padStart(len, "0")
 }
 
+
+export function parameter_bool(name: string, def: boolean): boolean {
+    const v = parameters[name]
+    if (!v) return def
+    if (v == "0" || v == "false" || v == "no") return false
+    if (v == "1" || v == "true" || v == "yes") return true
+    alert(`parameter ${name} is invalid`)
+    return  def
+}
+
+export function parameter_number(name: string, def: number): number {
+    const v = parameters[name]
+    if (!v) return def
+    const n = parseFloat(v)
+    if (Number.isNaN(n)) {
+        alert(`parameter ${name} is invalid`)
+        return def
+    }
+    return n
+}
+
+export function parameter_string(name: string, def: string): string {
+    const v = parameters[name]
+    if (!v) return def
+    return v
+}
+