parse testsuite script

.gitignore

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+target

Cargo.toml

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+[package]
+name = "wasm2llvm"
+version = "0.1.0"
+authors = ["Yakov Zaytsev <[email protected]>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+wabt = "0.9.0"

src/lib.rs

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+extern crate wabt;
+
+#[cfg(test)]
+mod tests {
+    use wabt::script::{ScriptParser, Command, CommandKind, Action, Value, Error};
+
+    #[test]
+    fn it_works() -> Result<(), Error> {
+        use std::fs;
+
+        let wast = fs::read_to_string("testsuite/i32.wast").unwrap();
+        let mut parser: ScriptParser = ScriptParser::from_str(&wast)?;
+        while let Some(Command { kind, .. }) = parser.next()? {
+            if let CommandKind::AssertReturn { action, expected } = kind {
+                if let Action::Invoke {
+                    module,
+                    field,
+                    args
+                } = action {
+                    println!("{} {:?} {:?}", field, args, expected);
+
+                    break;
+                }
+            }
+        }
+
+        Ok(())
+    }
+}