From 0cfcd7803909b351d4133862f3b178426530efc2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=BCndler?= <n.muendler@posteo.de>
Date: Thu, 14 Dec 2023 11:40:22 +0100
Subject: [PATCH] Use more clear functions

---
 crates/uplc/src/parser.rs | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/crates/uplc/src/parser.rs b/crates/uplc/src/parser.rs
index c39aa06e..a2def058 100644
--- a/crates/uplc/src/parser.rs
+++ b/crates/uplc/src/parser.rs
@@ -8,6 +8,8 @@ use crate::{
 
 use interner::Interner;
 use num_bigint::BigInt;
+use num_bigint::Sign;
+use num_traits::ToPrimitive;
 use pallas_primitives::alonzo::PlutusData;
 use peg::{error::ParseError, str::LineCol};
 
@@ -251,12 +253,11 @@ peg::parser! {
             PlutusData::Map(pallas_codec::utils::KeyValuePairs::Def(kvps))
           }
           / _* "List" _+ ls:plutus_list() { PlutusData::Array(ls) }
-          / _* "I" _+ n:big_number() { match i64::try_from(n.clone()) {
-            Ok(n) => PlutusData::BigInt(pallas_primitives::alonzo::BigInt::Int(n.into())),
-            Err(_) => if n < 0.into() {
-              PlutusData::BigInt(pallas_primitives::babbage::BigInt::BigNInt(n.to_bytes_be().1.into()))
-            } else {
-              PlutusData::BigInt(pallas_primitives::babbage::BigInt::BigUInt(n.to_bytes_be().1.into()))
+          / _* "I" _+ n:big_number() { match n.to_i64() {
+            Some(n) => PlutusData::BigInt(pallas_primitives::alonzo::BigInt::Int(n.into())),
+            None => match n.sign() {
+              Sign::Minus => PlutusData::BigInt(pallas_primitives::babbage::BigInt::BigNInt(n.to_bytes_be().1.into())),
+              _ => PlutusData::BigInt(pallas_primitives::babbage::BigInt::BigUInt(n.to_bytes_be().1.into()))
             }
           } }
           / _* "B" _+ "#" i:ident()* {?