split fce_wit_interfaces

crates/wit_parser/src/embedder.rs

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use super::custom::WITCustom;
+use super::errors::WITParserError;
+
+use walrus::ModuleConfig;
+use wasmer_wit::{
+    decoders::wat::{parse, Buffer},
+    encoders::binary::ToBytes,
+};
+
+use std::path::PathBuf;
+
+pub fn embed_text_wit(
+    in_wasm_path: PathBuf,
+    out_wasm_path: PathBuf,
+    wit: &str,
+) -> Result<(), WITParserError> {
+    let mut module = ModuleConfig::new()
+        .parse_file(&in_wasm_path)
+        .map_err(WITParserError::CorruptedWasmFile)?;
+
+    let buffer = Buffer::new(wit)?;
+    let ast = parse(&buffer)?;
+
+    let mut bytes = vec![];
+    ast.to_bytes(&mut bytes)?;
+
+    let custom = WITCustom(bytes);
+    module.customs.add(custom);
+    module
+        .emit_wasm_file(&out_wasm_path)
+        .map_err(WITParserError::WasmEmitError)?;
+
+    Ok(())
+}