1 files changed, 43 insertions, 0 deletions
diff --git a/client-web/source/helper.ts b/client-web/source/helper.ts
new file mode 100644
index 0000000..31e500a
--- /dev/null
+++ b/client-web/source/helper.ts
@@ -0,0 +1,43 @@
+/// <reference lib="dom" />
+
+import { parameters } from "./index.ts"
+
+export function get_query_params(): { [key: string]: string } {
+    const q: { [key: string]: string } = {}
+    for (const kv of window.location.hash.substring(1).split("&")) {
+        const [key, value] = kv.split("=")
+        q[decodeURIComponent(key)] = decodeURIComponent(value)
+    }
+    return q
+}
+
+export function hex_id(len = 8): string {
+    if (len > 8) return hex_id() + hex_id(len - 8)
+    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
+}