syntax: world + interface (#413)

* syntax: world + interface

Signed-off-by: Brian H <brian.hardock@fermyon.com>

* Get tests passing

Remove all parsing tests related to `use` along the way to get re-added
once `use` is re-implemented for top-level worlds.

* Update wit-parser tests to worlds

Drop usage of the old `Interface::parse_file` function.

* Add some basic tests for world

Assert some assorted failures as well as a basic successful structure.

* Remove existing support for `use`

This will come back shortly with worlds, but for now nothing uses this
in the repository any more and it's not implemented within the resolver
so temporarily remove it.

* Thread through docs on worlds/interfaces

* Remove docs from imports/exports

They're not threaded anywhere right now so remove them. Can be added
back in if needed in the future.

* Implement temporary stopgap of `default export`

* Fix demo build

Signed-off-by: Brian H <brian.hardock@fermyon.com>
Co-authored-by: Alex Crichton <alex@alexcrichton.com>

Author: fibonacci1729

Cargo.lock

@@ -24,6 +24,7 @@ heck =  { version = "0.4", features = ["unicode"] }
 pulldown-cmark = { version = "0.8", default-features = false }
 clap = { version = "4.0.9", features = ["derive"] }
 env_logger = "0.9.1"
+indexmap = "1.9.1"
 
 wasmtime = { git = "https://github.com/bytecodealliance/wasmtime", features = ["component-model"] }
 wasmtime-environ = { git = "https://github.com/bytecodealliance/wasmtime" }

Cargo.toml

@@ -16,7 +16,7 @@ record options {
   wasmtime-tracing: bool,
   js-compat: bool,
   js-instantiation: bool,
-  import: bool,
+  is-import: bool,
 }
 
 render: func(lang: lang, wit: string, options: options) -> result<files, string>

crates/wit-bindgen-demo/demo.wit

@@ -41,7 +41,7 @@ class Editor {
       wasmtimeTracing: false,
       jsCompat: false,
       jsInstantiation: false,
-      import: false,
+      isImport: false,
     };
     this.rerender = null;
   }
@@ -108,7 +108,7 @@ class Editor {
         break;
       default: return;
     }
-    this.options.import = is_import;
+    this.options.isImport = is_import;
     try {
       const results = render(lang, wit, this.options);
       this.generatedFiles = {};
@@ -122,8 +122,8 @@ class Editor {
       }
       if (selectedFile in this.generatedFiles)
         this.files.value = selectedFile;
-  
-      this.updateSelectedFile();  
+
+      this.updateSelectedFile();
     } catch (e) {
       this.outputEditor.setValue(e.payload);
       this.outputEditor.clearSelection();

crates/wit-bindgen-demo/main.ts

@@ -55,13 +55,13 @@ fn init() {
 fn render(lang: demo::Lang, wit: &str, files: &mut Files, options: &demo::Options) -> Result<()> {
     let iface = Interface::parse("input", &wit)?;
     let interfaces = ComponentInterfaces {
-        imports: if options.import {
+        imports: if options.is_import {
             [(iface.name.clone(), iface.clone())].into_iter().collect()
         } else {
             Default::default()
         },
         exports: Default::default(),
-        default: if !options.import {
+        default: if !options.is_import {
             Some(iface.clone())
         } else {
             None

crates/wit-bindgen-demo/src/lib.rs

@@ -20,11 +20,11 @@ wasm-encoder = { workspace = true }
 wat = { workspace = true }
 wit-parser = { workspace = true }
 anyhow = { workspace = true }
-indexmap = "1.9.1"
 clap = { workspace = true, optional = true }
 env_logger = { workspace = true, optional = true }
 log = "0.4.17"
 bitflags = { workspace = true }
+indexmap = { workspace = true }
 
 [dev-dependencies]
 wasmprinter = { workspace = true }

crates/wit-component/Cargo.toml

@@ -7,6 +7,7 @@ edition.workspace = true
 [dependencies]
 id-arena = "2"
 anyhow = { workspace = true }
+indexmap = { workspace = true }
 pulldown-cmark = { workspace = true }
 unicode-xid = "0.2.2"