eval with inputs (#56)

add_integers.uplc

@@ -1,5 +1,4 @@
 (program
   1.0.0
-  [(force (force (builtin fstPair))) (con (pair integer bytestring) (22, #1122aabb))]
+  (lam y (lam x [ [ (builtin addInteger) x ] y ]))
 )
-

crates/cli/src/args.rs

@@ -39,9 +39,11 @@ pub enum UplcCommand {
     },
     /// Evaluate an Untyped Plutus Core program
     Eval {
-        input: PathBuf,
+        script: PathBuf,
         #[clap(short, long)]
         flat: bool,
+        /// Arguments to pass to the uplc program
+        args: Vec<String>,
     },
 }
 

crates/cli/src/main.rs

@@ -82,21 +82,28 @@ fn main() -> anyhow::Result<()> {
                     fs::write(&out_name, pretty)?;
                 }
             }
-            UplcCommand::Eval { input, flat } => {
-                let program = if flat {
-                    let bytes = std::fs::read(&input)?;
+
+            UplcCommand::Eval { script, flat, args } => {
+                let mut program = if flat {
+                    let bytes = std::fs::read(&script)?;
 
                     let prog = Program::<FakeNamedDeBruijn>::from_flat(&bytes)?;
 
                     prog.into()
                 } else {
-                    let code = std::fs::read_to_string(&input)?;
+                    let code = std::fs::read_to_string(&script)?;
 
                     let prog = parser::program(&code)?;
 
                     Program::<NamedDeBruijn>::try_from(prog)?
                 };
 
+                for arg in args {
+                    let term: Term<NamedDeBruijn> = parser::term(&arg)?.try_into()?;
+
+                    program = program.apply_term(&term);
+                }
+
                 let (term, cost, logs) = program.eval();
 
                 match term {
@@ -121,8 +128,11 @@ fn main() -> anyhow::Result<()> {
                     "\nBudget\n------\ncpu: {}\nmemory: {}\n",
                     cost.cpu, cost.mem
                 );
+
+                if !logs.is_empty() {
                     println!("\nLogs\n----\n{}", logs.join("\n"))
                 }
+            }
         },
     }
 

crates/uplc/src/ast.rs

@@ -39,6 +39,21 @@ where
             term: applied_term,
         }
     }
+
+    /// We use this to apply the validator to Datum,
+    /// then redeemer, then ScriptContext. If datum is
+    /// even necessary (i.e. minting policy).
+    pub fn apply_term(&self, term: &Term<T>) -> Self {
+        let applied_term = Term::Apply {
+            function: Rc::new(self.term.clone()),
+            argument: Rc::new(term.clone()),
+        };
+
+        Program {
+            version: self.version,
+            term: applied_term,
+        }
+    }
 }
 
 impl<'a, T> Display for Program<T>

crates/uplc/src/parser.rs

@@ -25,6 +25,19 @@ pub fn program(src: &str) -> Result<Program<Name>, ParseError<LineCol>> {
     Ok(program)
 }
 
+pub fn term(src: &str) -> Result<Term<Name>, ParseError<LineCol>> {
+    // initialize the string interner to get unique name
+    let mut interner = Interner::new();
+
+    // run the generated parser
+    let mut term = uplc::term(src)?;
+
+    // assign proper unique ids in place
+    interner.term(&mut term);
+
+    Ok(term)
+}
+
 peg::parser! {
     grammar uplc() for str {
         pub rule program() -> Program<Name>
@@ -37,7 +50,7 @@ peg::parser! {
             (major as usize, minor as usize, patch as usize)
           }
 
-        rule term() -> Term<Name>
+        pub rule term() -> Term<Name>
           = constant()
           / builtin()
           / var()