feat: add a histrical wit-bindgen

__wasm/wit-bindgen-sample/wit-bindgen/crates/wit-component/src/lib.rs

@@ -0,0 +1,63 @@
+//! The WebAssembly component tooling.
+
+#![deny(missing_docs)]
+
+use anyhow::{bail, Result};
+use std::str::FromStr;
+use wasm_encoder::CanonicalOption;
+use wit_parser::Interface;
+
+#[cfg(feature = "cli")]
+pub mod cli;
+mod decoding;
+mod encoding;
+mod printing;
+mod validation;
+
+pub use encoding::*;
+pub use printing::*;
+
+/// Supported string encoding formats.
+#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
+pub enum StringEncoding {
+    /// Strings are encoded with UTF-8.
+    UTF8,
+    /// Strings are encoded with UTF-16.
+    UTF16,
+    /// Strings are encoded with compact UTF-16 (i.e. Latin1+UTF-16).
+    CompactUTF16,
+}
+
+impl Default for StringEncoding {
+    fn default() -> Self {
+        StringEncoding::UTF8
+    }
+}
+
+impl FromStr for StringEncoding {
+    type Err = anyhow::Error;
+
+    fn from_str(s: &str) -> Result<Self> {
+        match s {
+            "utf8" => Ok(StringEncoding::UTF8),
+            "utf16" => Ok(StringEncoding::UTF16),
+            "compact-utf16" => Ok(StringEncoding::CompactUTF16),
+            _ => bail!("unknown string encoding `{}`", s),
+        }
+    }
+}
+
+impl From<StringEncoding> for wasm_encoder::CanonicalOption {
+    fn from(e: StringEncoding) -> wasm_encoder::CanonicalOption {
+        match e {
+            StringEncoding::UTF8 => CanonicalOption::UTF8,
+            StringEncoding::UTF16 => CanonicalOption::UTF16,
+            StringEncoding::CompactUTF16 => CanonicalOption::CompactUTF16,
+        }
+    }
+}
+
+/// Decode an "interface-only" component to a wit `Interface`.
+pub fn decode_interface_component(bytes: &[u8]) -> Result<Interface> {
+    decoding::InterfaceDecoder::new(&decoding::ComponentInfo::new(bytes)?).decode()
+}