Initial commit: Closed loop of TS->Rust->TS

src/lib.rs

@@ -0,0 +1,70 @@
+extern crate serde;
+extern crate serde_json;
+extern crate wasm_bindgen;
+extern crate web_sys;
+#[macro_use]
+extern crate serde_derive;
+
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+#[derive(Deserialize)]
+pub struct Input {
+    pub screen_width: f32,
+    pub screen_height: f32,
+    pub mouse_x: f32,
+    pub mouse_y: f32,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "snake_case")]
+enum TextAlign {
+    Start,
+    Center,
+    End,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "snake_case", tag = "kind")]
+enum PaintCmd {
+    Clear {
+        fill_style: String,
+    },
+    RoundedRect {
+        fill_style: String,
+        pos: [f32; 2],
+        size: [f32; 2],
+        radius: f32,
+    },
+    Text {
+        fill_style: String,
+        font: String,
+        pos: [f32; 2],
+        text: String,
+        text_align: TextAlign,
+    },
+}
+
+#[wasm_bindgen]
+pub fn show_gui(input_json: &str) -> String {
+    let input: Input = serde_json::from_str(input_json).unwrap();
+    let commands = [
+        PaintCmd::Clear {
+            fill_style: "#44444400".to_string(),
+        },
+        PaintCmd::RoundedRect {
+            fill_style: "#1111ff".to_string(),
+            pos: [100.0, 100.0],
+            radius: 40.0,
+            size: [200.0, 200.0],
+        },
+        PaintCmd::Text {
+            fill_style: "#11ff00".to_string(),
+            font: "14px Palatino".to_string(),
+            pos: [200.0, 32.0],
+            text: format!("Mouse pos: {} {}", input.mouse_x, input.mouse_y),
+            text_align: TextAlign::Center,
+        },
+    ];
+    serde_json::to_string(&commands).unwrap()
+}