feat: Added support for completions in monaco editor.

- Monaco input type now accepts a vector of json values to be used for
  completions.
- Added JS-FFI(via wasm-bindgen) to create monaco completions object.
  This is required as we have to call another JS-FFI to register this
  object, and that FFI itself accepts a foreign JS type, so needed to
  write the constructor in JS.
- Completions get registered on render & cleaned up on
  de-render.

crates/frontend/Cargo.toml

@@ -37,6 +37,7 @@ web-sys = { version = "0.3.64", features = [
   "Window",
   "Storage",
 ] }
+serde-wasm-bindgen = "0.6.5"
 
 [features]
 csr = ["leptos/csr", "leptos_meta/csr", "leptos_router/csr"]

crates/frontend/assets/utils.js

@@ -0,0 +1,73 @@
+function toStr(v) {
+    switch (typeof v) {
+        case "string":
+            return v;
+        case "object":
+            return JSON.stringify(v);
+        default:
+            return v.toString();
+    }
+}
+
+/// Returns a `CompletionItemProvider` https://microsoft.github.io/monaco-editor/docs.html#interfaces/languages.CompletionItemProvider.html
+export function newSuggestionsProvider(suggestions) {
+    if (typeof suggestions !== "object" || !Array.isArray(suggestions)) {
+        throw new Error(`${suggestions} is not an array!`);
+    }
+
+    let triggers = [];
+    for (const s of suggestions) {
+        switch (typeof s) {
+            case "string":
+                triggers.push('"');
+                triggers.push("'");
+                break;
+            // Not sure if we should help in such cases...
+            case "object":
+                if (s !== null) {
+                    if (Array.isArray(s)) {
+                        triggers.push("[");
+                    } else {
+                        triggers.push("{");
+                    }
+                } else if (s == null) {
+                    triggers.push("n");
+                }
+                break;
+            case "number":
+            // While technically not part of JsonSchema,
+            // if we can, then why not.
+            case "bigint":
+                const d = s.toString()[0];
+                triggers.push(d)
+                break;
+            // Screw these.
+            case "undefined":
+            case "function":
+            case "symbol":
+            default:
+                console.debug(`Un-supported type in suggestions: ${typeof s}, skipping.`);
+        }
+    }
+    // Just in case duplicates lead to some bug.
+    triggers = [...new Set(triggers)];
+    console.debug(`Trigger characters for suggestions: ${triggers}`);
+
+    return {
+        provideCompletionItems: function (model, position) {
+            return {
+                suggestions: suggestions.map((s) => ({
+                    // This is the text that shows up in the completion hover.
+                    label: toStr(s),
+                    // FIXME Coupling w/ private Enum, this can break w/ a newer version of
+                    // monaco.
+                    kind: 15, // Maps to the `Enum` varaint of `Kind`.
+                    insertText: toStr(s),
+                    detail: "Enum variant",
+                    documentation: "Json Enum",
+                })),
+            };
+        },
+        triggerCharacters: triggers,
+    };
+}

crates/frontend/src/components/default_config_form.rs

@@ -288,7 +288,7 @@ where
                                     on_change=Callback::new(move |new_config_schema| {
                                         config_schema_ws.set(new_config_schema)
                                     })
-                                    r#type=InputType::Monaco
+                                    r#type=InputType::Monaco(vec![])
                                 />
 
                                 <Show when=move || {

crates/frontend/src/components/dimension_form.rs

@@ -240,7 +240,7 @@ where
                                     on_change=Callback::new(move |new_type_schema| {
                                         dimension_schema_ws.set(new_type_schema)
                                     })
-                                    r#type=InputType::Monaco
+                                    r#type=InputType::Monaco(vec![])
                                 />
                             </EditorProvider>
                         </div>

crates/frontend/src/components/input.rs

@@ -20,7 +20,7 @@ pub enum InputType {
     Number,
     Integer,
     Toggle,
-    Monaco,
+    Monaco(Vec<Value>),
     Select(EnumVariants),
     Disabled,
 }
@@ -31,7 +31,7 @@ impl InputType {
             InputType::Text
             | InputType::Disabled
             | InputType::Toggle
-            | InputType::Monaco
+            | InputType::Monaco(_)
             | InputType::Select(_) => "text",
 
             InputType::Number | InputType::Integer => "number",
@@ -51,13 +51,13 @@ impl From<(SchemaType, EnumVariants)> for InputType {
             SchemaType::Single(JsonSchemaType::Boolean) => InputType::Toggle,
             SchemaType::Single(JsonSchemaType::String) => InputType::Text,
             SchemaType::Single(JsonSchemaType::Null) => InputType::Disabled,
-            SchemaType::Single(JsonSchemaType::Array) => InputType::Monaco,
-            SchemaType::Single(JsonSchemaType::Object) => InputType::Monaco,
+            SchemaType::Single(JsonSchemaType::Array) => InputType::Monaco(vec![]),
+            SchemaType::Single(JsonSchemaType::Object) => InputType::Monaco(vec![]),
             SchemaType::Multiple(types)
                 if types.contains(&JsonSchemaType::Object)
                     || types.contains(&JsonSchemaType::Array) =>
             {
-                InputType::Monaco
+                InputType::Monaco(vec![])
             }
             SchemaType::Multiple(_) => InputType::Text,
         }
@@ -69,7 +69,8 @@ impl From<(SchemaType, EnumVariants, Operator)> for InputType {
         (schema_type, enum_variants, operator): (SchemaType, EnumVariants, Operator),
     ) -> Self {
         if operator == Operator::In {
-            return InputType::Monaco;
+            let EnumVariants(ev) = enum_variants;
+            return InputType::Monaco(ev);
         }
 
         InputType::from((schema_type, enum_variants))
@@ -300,10 +301,12 @@ pub fn monaco_input(
     on_change: Callback<Value, ()>,
     schema_type: SchemaType,
     #[prop(default = false)] disabled: bool,
+    suggestions: Vec<Value>,
     #[prop(default = None)] operator: Option<Operator>,
 ) -> impl IntoView {
     let id = store_value(id);
     let schema_type = store_value(schema_type);
+    let suggestions = store_value(suggestions);
     let (value_rs, value_ws) = create_signal(value);
     let (expand_rs, expand_ws) = create_signal(false);
     let (error_rs, error_ws) = create_signal::<Option<String>>(None);
@@ -418,6 +421,7 @@ pub fn monaco_input(
 
                                 language=Languages::Json
                                 classes=vec!["h-full"]
+                                suggestions=suggestions.get_value()
                             />
                             <div class="absolute top-[0px] right-[0px]">
                                 <button
@@ -496,8 +500,8 @@ pub fn input(
         },
         InputType::Select(ref options) => view! { <Select id name class value on_change disabled options=options.0.clone() /> }
         .into_view(),
-        InputType::Monaco => {
-            view! { <MonacoInput id class value on_change disabled schema_type operator/> }.into_view()
+        InputType::Monaco(suggestions) => {
+            view! { <MonacoInput id class value on_change schema_type suggestions operator /> }.into_view()
         }
         _ => {
             view! {

crates/frontend/src/components/monaco_editor.rs

@@ -4,6 +4,12 @@ use std::rc::Rc;
 use leptos::*;
 use monaco::api::CodeEditor;
 use monaco::sys::editor::{IEditorMinimapOptions, IStandaloneEditorConstructionOptions};
+use monaco::sys::languages::{register_completion_item_provider, CompletionItemProvider};
+use monaco::sys::IDisposable;
+use serde_json::Value;
+use wasm_bindgen::prelude::*;
+use wasm_bindgen::JsValue;
+
 #[derive(Debug, Clone, strum_macros::Display)]
 #[strum(serialize_all = "lowercase")]
 pub enum Languages {
@@ -13,6 +19,35 @@ pub enum Languages {
 
 pub type EditorModelCell = Rc<Option<CodeEditor>>;
 
+#[wasm_bindgen(module = "/assets/utils.js")]
+extern "C" {
+    #[wasm_bindgen(js_name = newSuggestionsProvider)]
+    fn new_suggestions_provider(suggestions: JsValue) -> CompletionItemProvider;
+}
+
+// Returns an object which allows removing the suggestions.
+fn set_monaco_suggestions(lang_id: &str, suggestions: &[Value]) -> Option<IDisposable> {
+    logging::debug_warn!(
+        "Trying to set monaco suggestions: {:?}, for lang-id: {lang_id}",
+        suggestions
+    );
+    match serde_wasm_bindgen::to_value(suggestions) {
+        Ok(jsv) => {
+            let cip = new_suggestions_provider(jsv);
+            Some(register_completion_item_provider(lang_id, &cip))
+        }
+        Err(e) => {
+            logging::error!(
+                r#"
+                Failed to convert monaco suggestions to native JS values.
+                Error: {e}
+                "#
+            );
+            None
+        }
+    }
+}
+
 #[component]
 pub fn monaco_editor(
     #[prop(into)] node_id: String,
@@ -22,10 +57,15 @@ pub fn monaco_editor(
     #[prop(default = vec!["min-h-50"])] classes: Vec<&'static str>,
     #[prop(default = false)] _validation: bool,
     #[prop(default = false)] read_only: bool,
+    #[prop(default = vec![])] suggestions: Vec<Value>,
 ) -> impl IntoView {
     let editor_ref = create_node_ref::<html::Div>();
     let (editor_rs, editor_ws) = create_signal(Rc::new(None));
     let styling = classes.join(" ");
+    if let Some(idp) = set_monaco_suggestions(language.to_string().as_str(), &suggestions)
+    {
+        on_cleanup(move || idp.dispose());
+    }
     create_effect(move |_| {
         if let Some(node) = editor_ref.get() {
             monaco::workers::ensure_environment_set();
@@ -45,7 +85,6 @@ pub fn monaco_editor(
             editor_settings.set_read_only(Some(read_only));
             editor_settings.set_minimap(Some(&minimap_settings));
             let editor = CodeEditor::create(&node, Some(editor_settings));
-
             editor_ws.set(Rc::new(Some(editor)));
         }
     });

crates/frontend/src/components/type_template_form.rs

@@ -159,7 +159,7 @@ where
                                 on_change=Callback::new(move |new_type_schema| {
                                     type_schema_ws.set(new_type_schema)
                                 })
-                                r#type=InputType::Monaco
+                                r#type=InputType::Monaco(vec![])
                             />
                         </EditorProvider>
                     }