display statement/statement_tmpl as in pod lang v1

src/backends/plonky2/circuits/common.rs

@@ -543,6 +543,7 @@ impl CustomPredicateEntryTarget {
             conjunction: predicate.conjunction,
             statements,
             args_len: predicate.args_len,
+            wildcard_names: predicate.wildcard_names.clone(),
         };
         self.predicate.set_targets(pw, params, &predicate)?;
         Ok(())

src/backends/plonky2/mainpod/statement.rs

@@ -131,7 +131,7 @@ impl fmt::Display for Statement {
                 if i != 0 {
                     write!(f, " ")?;
                 }
-                write!(f, "{}", arg)?;
+                arg.fmt(f)?;
             }
         }
         Ok(())

src/examples/custom.rs

@@ -41,7 +41,7 @@ pub fn eth_friend_batch(params: &Params, mock: bool) -> Result<Arc<CustomPredica
         ],
     )?;
 
-    println!("a.0. eth_friend = {}", builder.predicates.last().unwrap());
+    println!("a.0. {}", builder.predicates.last().unwrap());
     Ok(builder.finish())
 }
 
@@ -75,10 +75,7 @@ pub fn eth_dos_batch(params: &Params, mock: bool) -> Result<Arc<CustomPredicateB
                 .arg(literal(0)),
         ],
     )?;
-    println!(
-        "b.0. eth_dos_distance_base = {}",
-        builder.predicates.last().unwrap()
-    );
+    println!("b.0. {}", builder.predicates.last().unwrap());
 
     let eth_dos_distance = Predicate::BatchSelf(2);
 
@@ -115,10 +112,7 @@ pub fn eth_dos_batch(params: &Params, mock: bool) -> Result<Arc<CustomPredicateB
         ],
     )?;
 
-    println!(
-        "b.1. eth_dos_distance_ind = {}",
-        builder.predicates.last().unwrap()
-    );
+    println!("b.1. {}", builder.predicates.last().unwrap());
 
     let _eth_dos_distance = builder.predicate_or(
         "eth_dos_distance",
@@ -136,10 +130,7 @@ pub fn eth_dos_batch(params: &Params, mock: bool) -> Result<Arc<CustomPredicateB
         ],
     )?;
 
-    println!(
-        "b.2. eth_dos_distance = {}",
-        builder.predicates.last().unwrap()
-    );
+    println!("b.2. {}", builder.predicates.last().unwrap());
 
     Ok(builder.finish())
 }

src/frontend/custom.rs

@@ -237,6 +237,10 @@ impl CustomPredicateBatchBuilder {
             conjunction,
             statements,
             args.len(),
+            args.iter()
+                .chain(priv_args.iter())
+                .map(|s| s.to_string())
+                .collect(),
         )?;
         self.predicates.push(custom_predicate);
         Ok(Predicate::BatchSelf(self.predicates.len() - 1))

src/lang/mod.rs

@@ -54,6 +54,10 @@ mod tests {
         StatementTmplArg::Literal(value.into())
     }
 
+    fn names(names: &[&str]) -> Vec<String> {
+        names.iter().map(|s| s.to_string()).collect()
+    }
+
     #[test]
     fn test_e2e_simple_predicate() -> Result<(), LangError> {
         let input = r#"
@@ -86,6 +90,7 @@ mod tests {
             "is_equal".to_string(),
             expected_statements,
             2, // args_len (PodA, PodB)
+            names(&["PodA", "PodB"]),
         )?;
         let expected_batch =
             CustomPredicateBatch::new(&params, "PodlogBatch".to_string(), vec![expected_predicate]);
@@ -180,6 +185,7 @@ mod tests {
             "uses_private".to_string(),
             expected_statements,
             1, // args_len (A)
+            names(&["A", "Temp"]),
         )?;
         let expected_batch =
             CustomPredicateBatch::new(&params, "PodlogBatch".to_string(), vec![expected_predicate]);
@@ -226,6 +232,7 @@ mod tests {
             "my_pred".to_string(),
             expected_pred_statements,
             2, // args_len (X, Y)
+            names(&["X", "Y"]),
         )?;
         let expected_batch =
             CustomPredicateBatch::new(&params, "PodlogBatch".to_string(), vec![expected_predicate]);
@@ -516,7 +523,7 @@ mod tests {
                 eth_friend(?intermed_key, ?dst_key)
             )
 
-            eth_dos_distance(src_key, dst_key, distance_key, private: intermed_key, shorter_distance_key) = OR(
+            eth_dos_distance(src_key, dst_key, distance_key) = OR(
                 eth_dos_distance_base(?src_key, ?dst_key, ?distance_key)
                 eth_dos_distance_ind(?src_key, ?dst_key, ?distance_key)
             )
@@ -566,6 +573,7 @@ mod tests {
             true, // AND
             expected_friend_stmts,
             2, // public_args_len: src_key, dst_key
+            names(&["src_key", "dst_key", "attestation_pod"]),
         )?;
 
         // eth_dos_distance_base (Index 1)
@@ -588,6 +596,7 @@ mod tests {
             true, // AND
             expected_base_stmts,
             3, // public_args_len
+            names(&["src_key", "dst_key", "distance_key"]),
         )?;
 
         // eth_dos_distance_ind (Index 2)
@@ -630,6 +639,14 @@ mod tests {
             true, // AND
             expected_ind_stmts,
             3, // public_args_len
+            names(&[
+                "src_key",
+                "dst_key",
+                "distance_key",
+                "one_key",
+                "shorter_distance_key",
+                "intermed_key",
+            ]),
         )?;
 
         // eth_dos_distance (Index 3)
@@ -659,6 +676,7 @@ mod tests {
             false, // OR
             expected_dist_stmts,
             3, // public_args_len
+            names(&["src_key", "dst_key", "distance_key"]),
         )?;
 
         let expected_batch = CustomPredicateBatch::new(

src/middleware/custom.rs

@@ -23,7 +23,11 @@ impl Wildcard {
 
 impl fmt::Display for Wildcard {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "*{}[{}]", self.index, self.name)
+        if f.alternate() {
+            write!(f, "?{}:{}", self.index, self.name)
+        } else {
+            write!(f, "?{}", self.name)
+        }
     }
 }
 
@@ -43,8 +47,8 @@ pub enum KeyOrWildcard {
 impl fmt::Display for KeyOrWildcard {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
-            Self::Key(k) => write!(f, "{}", k),
-            Self::Wildcard(wc) => write!(f, "{}", wc),
+            Self::Key(k) => k.fmt(f),
+            Self::Wildcard(wc) => wc.fmt(f),
         }
     }
 }
@@ -75,7 +79,7 @@ impl fmt::Display for SelfOrWildcard {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
             Self::SELF => write!(f, "SELF"),
-            Self::Wildcard(wc) => write!(f, "{}", wc),
+            Self::Wildcard(wc) => wc.fmt(f),
         }
     }
 }
@@ -166,9 +170,14 @@ impl fmt::Display for StatementTmplArg {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match self {
             Self::None => write!(f, "none"),
-            Self::Literal(v) => write!(f, "{}", v),
-            Self::AnchoredKey(pod_id, key) => write!(f, "({}, {})", pod_id, key),
-            Self::WildcardLiteral(v) => write!(f, "{}", v),
+            Self::Literal(v) => v.fmt(f),
+            Self::AnchoredKey(pod_id, key) => {
+                pod_id.fmt(f)?;
+                write!(f, "[")?;
+                key.fmt(f)?;
+                write!(f, "]")
+            }
+            Self::WildcardLiteral(v) => v.fmt(f),
         }
     }
 }
@@ -191,12 +200,13 @@ impl StatementTmpl {
 
 impl fmt::Display for StatementTmpl {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}(", self.pred)?;
+        self.pred.fmt(f)?;
+        write!(f, "(")?;
         for (i, arg) in self.args.iter().enumerate() {
             if i != 0 {
                 write!(f, ", ")?;
             }
-            write!(f, "{}", arg)?;
+            arg.fmt(f)?;
         }
         writeln!(f)
     }
@@ -240,6 +250,9 @@ pub struct CustomPredicate {
     pub(crate) conjunction: bool,
     pub(crate) statements: Vec<StatementTmpl>,
     pub(crate) args_len: usize,
+    /// Names of the wildcards, the first `args_len` entries correspond to the `args_len` arguments
+    /// of the custom predicate.
+    pub(crate) wildcard_names: Vec<String>,
     // TODO: Add private args length?
     // TODO: Add args type information?
 }
@@ -254,30 +267,34 @@ impl CustomPredicate {
                 args: vec![],
             }],
             args_len: 0,
+            wildcard_names: vec![],
         }
     }
     pub fn and(
         params: &Params,
         name: String,
         statements: Vec<StatementTmpl>,
         args_len: usize,
+        wildcard_names: Vec<String>,
     ) -> Result<Self> {
-        Self::new(params, name, true, statements, args_len)
+        Self::new(params, name, true, statements, args_len, wildcard_names)
     }
     pub fn or(
         params: &Params,
         name: String,
         statements: Vec<StatementTmpl>,
         args_len: usize,
+        wildcard_names: Vec<String>,
     ) -> Result<Self> {
-        Self::new(params, name, false, statements, args_len)
+        Self::new(params, name, false, statements, args_len, wildcard_names)
     }
     pub fn new(
         params: &Params,
         name: String,
         conjunction: bool,
         statements: Vec<StatementTmpl>,
         args_len: usize,
+        wildcard_names: Vec<String>,
     ) -> Result<Self> {
         if statements.len() > params.max_custom_predicate_arity {
             return Err(Error::max_length(
@@ -293,12 +310,20 @@ impl CustomPredicate {
                 params.max_statement_args,
             ));
         }
+        if wildcard_names.len() > params.max_custom_predicate_wildcards {
+            return Err(Error::max_length(
+                "custom_predicate_wildcards.len".to_string(),
+                wildcard_names.len(),
+                params.max_custom_predicate_wildcards,
+            ));
+        }
 
         Ok(Self {
             name,
             conjunction,
             statements,
             args_len,
+            wildcard_names,
         })
     }
     pub fn pad_statement_tmpl(&self) -> StatementTmpl {
@@ -346,25 +371,33 @@ impl ToFields for CustomPredicate {
 
 impl fmt::Display for CustomPredicate {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        writeln!(f, "{}<", if self.conjunction { "and" } else { "or" })?;
+        write!(f, "{}(", self.name)?;
+        for (i, name) in self.wildcard_names.iter().enumerate() {
+            if i != 0 {
+                write!(f, ", ")?;
+            }
+            if i == self.args_len {
+                write!(f, "private: ")?;
+            }
+            if f.alternate() {
+                write!(f, "{}:", i)?;
+            }
+            write!(f, "{}", name)?;
+        }
+        writeln!(f, ") = {}(", if self.conjunction { "AND" } else { "OR" })?;
         for st in &self.statements {
-            write!(f, "  {}(", st.pred)?;
+            write!(f, "  ")?;
+            st.pred.fmt(f)?;
+            write!(f, "(")?;
             for (i, arg) in st.args.iter().enumerate() {
                 if i != 0 {
                     write!(f, ", ")?;
                 }
-                write!(f, "{}", arg)?;
-            }
-            writeln!(f, "),")?;
-        }
-        write!(f, ">(")?;
-        for i in 0..self.args_len {
-            if i != 0 {
-                write!(f, ", ")?;
+                arg.fmt(f)?;
             }
-            write!(f, "*{}", i)?;
+            writeln!(f, ")")?;
         }
-        writeln!(f, ")")?;
+        write!(f, ")")?;
         Ok(())
     }
 }
@@ -467,6 +500,9 @@ mod tests {
             index: i,
         }
     }
+    fn names(names: &[&str]) -> Vec<String> {
+        names.iter().map(|s| s.to_string()).collect()
+    }
 
     type STA = StatementTmplArg;
     type KOW = KeyOrWildcard;
@@ -507,6 +543,7 @@ mod tests {
                     ),
                 ],
                 2,
+                names(&["1", "2", "3", "4", "5"]),
             )?],
         );
 
@@ -570,6 +607,7 @@ mod tests {
                 ),
             ],
             4,
+            names(&["1", "2", "3", "4"]),
         )?;
 
         let eth_friend_batch =
@@ -596,6 +634,7 @@ mod tests {
                 ),
             ],
             6,
+            names(&["0", "1", "2", "3", "4", "5"]),
         )?;
 
         // 1
@@ -640,6 +679,7 @@ mod tests {
                 ),
             ],
             6,
+            names(&["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11"]),
         )?;
 
         // 2
@@ -671,6 +711,7 @@ mod tests {
                 ),
             ],
             6,
+            names(&["0", "1", "2", "3", "4", "5"]),
         )?;
 
         let eth_dos_distance_batch = CustomPredicateBatch::new(