Add experimental wasm bindings

Published to npm as objdiff-wasm

objdiff-core/src/bindings/wasm.rs

@@ -0,0 +1,53 @@
+use anyhow::Context;
+use prost::Message;
+use wasm_bindgen::prelude::*;
+
+use crate::{bindings::diff::DiffResult, diff, obj};
+
+#[wasm_bindgen]
+pub fn run_diff(
+    left: Option<Box<[u8]>>,
+    right: Option<Box<[u8]>>,
+    config: diff::DiffObjConfig,
+) -> Result<String, JsError> {
+    let target = left
+        .as_ref()
+        .map(|data| obj::read::parse(data, &config).context("Loading target"))
+        .transpose()
+        .map_err(|e| JsError::new(&e.to_string()))?;
+    let base = right
+        .as_ref()
+        .map(|data| obj::read::parse(data, &config).context("Loading base"))
+        .transpose()
+        .map_err(|e| JsError::new(&e.to_string()))?;
+    let result = diff::diff_objs(&config, target.as_ref(), base.as_ref(), None)
+        .map_err(|e| JsError::new(&e.to_string()))?;
+    let left = target.as_ref().and_then(|o| result.left.as_ref().map(|d| (o, d)));
+    let right = base.as_ref().and_then(|o| result.right.as_ref().map(|d| (o, d)));
+    let out = DiffResult::new(left, right);
+    serde_json::to_string(&out).map_err(|e| JsError::new(&e.to_string()))
+}
+
+#[wasm_bindgen]
+pub fn run_diff_proto(
+    left: Option<Box<[u8]>>,
+    right: Option<Box<[u8]>>,
+    config: diff::DiffObjConfig,
+) -> Result<Box<[u8]>, JsError> {
+    let target = left
+        .as_ref()
+        .map(|data| obj::read::parse(data, &config).context("Loading target"))
+        .transpose()
+        .map_err(|e| JsError::new(&e.to_string()))?;
+    let base = right
+        .as_ref()
+        .map(|data| obj::read::parse(data, &config).context("Loading base"))
+        .transpose()
+        .map_err(|e| JsError::new(&e.to_string()))?;
+    let result = diff::diff_objs(&config, target.as_ref(), base.as_ref(), None)
+        .map_err(|e| JsError::new(&e.to_string()))?;
+    let left = target.as_ref().and_then(|o| result.left.as_ref().map(|d| (o, d)));
+    let right = base.as_ref().and_then(|o| result.right.as_ref().map(|d| (o, d)));
+    let out = DiffResult::new(left, right);
+    Ok(out.encode_to_vec().into_boxed_slice())
+}