Expose mod permutation and re-export permutation::keygen::Assembly

halo2_proofs/src/dev.rs

@@ -973,7 +973,7 @@ impl<F: FieldExt> MockProver<F> {
 
             // Iterate over each column of the permutation
             self.permutation
-                .mapping
+                .mapping()
                 .iter()
                 .enumerate()
                 .flat_map(move |(column, values)| {
@@ -1334,7 +1334,7 @@ impl<F: FieldExt> MockProver<F> {
 
             // Iterate over each column of the permutation
             self.permutation
-                .mapping
+                .mapping()
                 .iter()
                 .enumerate()
                 .flat_map(move |(column, values)| {

halo2_proofs/src/plonk.rs

@@ -27,7 +27,7 @@ mod error;
 mod evaluation;
 mod keygen;
 mod lookup;
-pub(crate) mod permutation;
+pub mod permutation;
 mod vanishing;
 
 mod prover;

halo2_proofs/src/plonk/permutation.rs

@@ -1,3 +1,5 @@
+//! Implementation of permutation argument.
+
 use super::circuit::{Any, Column};
 use crate::{
     arithmetic::CurveAffine,
@@ -14,6 +16,8 @@ pub(crate) mod keygen;
 pub(crate) mod prover;
 pub(crate) mod verifier;
 
+pub use keygen::Assembly;
+
 use std::io;
 
 /// A permutation argument.
@@ -72,6 +76,7 @@ impl Argument {
         }
     }
 
+    /// Returns columns that participate on the permutation argument.
     pub fn get_columns(&self) -> Vec<Column<Any>> {
         self.columns.clone()
     }

halo2_proofs/src/plonk/permutation/keygen.rs

@@ -12,16 +12,16 @@ use crate::{
 };
 
 /// Struct that accumulates all the necessary data in order to construct the permutation argument.
-#[derive(Debug, PartialEq, Eq)]
+#[derive(Clone, Debug, PartialEq, Eq)]
 pub struct Assembly {
     /// Columns that participate on the copy permutation argument.
-    pub columns: Vec<Column<Any>>,
+    columns: Vec<Column<Any>>,
     /// Mapping of the actual copies done.
-    pub mapping: Vec<Vec<(usize, usize)>>,
+    mapping: Vec<Vec<(usize, usize)>>,
     /// Some aux data used to swap positions directly when sorting.
-    pub aux: Vec<Vec<(usize, usize)>>,
+    aux: Vec<Vec<(usize, usize)>>,
     /// More aux data
-    pub sizes: Vec<Vec<usize>>,
+    sizes: Vec<Vec<usize>>,
 }
 
 impl Assembly {
@@ -239,4 +239,14 @@ impl Assembly {
             cosets,
         }
     }
+
+    /// Returns columns that participate on the permutation argument.
+    pub fn columns(&self) -> &[Column<Any>] {
+        &self.columns
+    }
+
+    /// Returns mappings of the copies.
+    pub fn mapping(&self) -> &[Vec<(usize, usize)>] {
+        &self.mapping
+    }
 }