feat: remove flat-rs crate and use it through pallas_codec

crates/uplc/Cargo.toml

@@ -33,7 +33,6 @@ serde_json = "1.0.94"
 strum = "0.24.1"
 strum_macros = "0.24.3"
 thiserror = "1.0.39"
-flat-rs = { path = "../flat-rs", version = "1.0.20-alpha" }
 blst = "0.3.11"
 once_cell = "1.18.0"
 

crates/uplc/src/builtins.rs

@@ -1,9 +1,8 @@
 use std::{fmt::Display, rc::Rc, str::FromStr};
 
+use pallas_codec::flat::de;
 use strum_macros::EnumIter;
 
-use flat_rs::de;
-
 use crate::ast::Term;
 
 /// All the possible builtin functions in Untyped Plutus Core.

crates/uplc/src/flat.rs

@@ -1,3 +1,12 @@
+use std::{collections::VecDeque, fmt::Debug, rc::Rc};
+
+use pallas_codec::flat::{
+    de::{self, Decode, Decoder},
+    en::{self, Encode, Encoder},
+    Flat,
+};
+use pallas_primitives::{babbage::PlutusData, Fragment};
+
 use crate::{
     ast::{
         Constant, DeBruijn, FakeNamedDeBruijn, Name, NamedDeBruijn, Program, Term, Type, Unique,
@@ -6,16 +15,6 @@ use crate::{
     machine::runtime::Compressable,
 };
 
-use anyhow::anyhow;
-
-use flat_rs::{
-    de::{self, Decode, Decoder},
-    en::{self, Encode, Encoder},
-    Flat,
-};
-use pallas_primitives::{babbage::PlutusData, Fragment};
-use std::{collections::VecDeque, fmt::Debug, rc::Rc};
-
 const BUILTIN_TAG_WIDTH: u32 = 7;
 const CONST_TAG_WIDTH: u32 = 4;
 const TERM_TAG_WIDTH: u32 = 4;
@@ -117,7 +116,10 @@ where
 
         match term_option {
             Ok(term) => Ok(Program { version, term }),
-            Err(error) => Err(de::Error::ParseError(state_log.join(""), anyhow!(error))),
+            Err(error) => Err(de::Error::Message(format!(
+                "{} {error}",
+                state_log.join("")
+            ))),
         }
     }
 }
@@ -948,8 +950,8 @@ mod tests {
         ast::{DeBruijn, Name, Type},
         parser,
     };
-    use flat_rs::Flat;
     use indoc::indoc;
+    use pallas_codec::flat::Flat;
 
     #[test]
     fn flat_encode_integer() {

crates/uplc/src/tx/error.rs

@@ -7,7 +7,7 @@ pub enum Error {
     #[error("Only shelley reward addresses can be a part of withdrawals")]
     BadWithdrawalAddress,
     #[error("{0}")]
-    FlatDecode(#[from] flat_rs::de::Error),
+    FlatDecode(#[from] pallas_codec::flat::de::Error),
     #[error("{0}")]
     FragmentDecode(#[from] pallas_primitives::Error),
     #[error("{}\n\n{:#?}\n\n{}", .0, .1, .2.join("\n"))]