fix: builtin parsing

example/plutus-core

@@ -1,3 +1,3 @@
 (program 1.0.0
-    [(lam x (con integer 4)) (con bool False)]
+    [[(builtin addInteger) (con integer 4)] (con integer 8)]
 )

src/ast.rs

@@ -1,4 +1,4 @@
-use strum_macros::EnumString;
+use crate::builtins::DefaultFunction;
 
 #[derive(Debug)]
 pub struct Program {
@@ -27,7 +27,7 @@ pub enum Term {
     // tag: 5
     Force(Box<Term>),
     // tag: 6
-    Error(Box<Term>),
+    Error,
     // tag: 7
     Builtin(DefaultFunction),
 }
@@ -48,79 +48,3 @@ pub enum Constant {
     // tag: 5
     Bool(bool),
 }
-
-#[allow(non_camel_case_types)]
-#[derive(Debug, Clone, EnumString)]
-pub enum DefaultFunction {
-    // Integer functions
-    AddInteger,
-    SubtractInteger,
-    MultiplyInteger,
-    DivideInteger,
-    QuotientInteger,
-    RemainderInteger,
-    ModInteger,
-    EqualsInteger,
-    LessThanInteger,
-    LessThanEqualsInteger,
-    // ByteString functions
-    AppendByteString,
-    ConsByteString,
-    SliceByteString,
-    LengthOfByteString,
-    IndexByteString,
-    EqualsByteString,
-    LessThanByteString,
-    LessThanEqualsByteString,
-    // Cryptography and hash functions
-    Sha2_256,
-    Sha3_256,
-    Blake2b_256,
-    VerifySignature,
-    VerifyEcdsaSecp256k1Signature,
-    VerifySchnorrSecp256k1Signature,
-    // String functions
-    AppendString,
-    EqualsString,
-    EncodeUtf8,
-    DecodeUtf8,
-    // Bool function
-    IfThenElse,
-    // Unit function
-    ChooseUnit,
-    // Tracing function
-    Trace,
-    // Pairs functions
-    FstPair,
-    SndPair,
-    // List functions
-    ChooseList,
-    MkCons,
-    HeadList,
-    TailList,
-    NullList,
-    // Data functions
-    // It is convenient to have a "choosing" function for a data type that has more than two
-    // constructors to get pattern matching over it and we may end up having multiple such data
-    // types, hence we include the name of the data type as a suffix.
-    ChooseData,
-    ConstrData,
-    MapData,
-    ListData,
-    IData,
-    BData,
-    UnConstrData,
-    UnMapData,
-    UnListData,
-    UnIData,
-    UnBData,
-    EqualsData,
-    SerialiseData,
-    // Misc constructors
-    // Constructors that we need for constructing e.g. Data. Polymorphic builtin
-    // constructors are often problematic (See note [Representable built-in
-    // functions over polymorphic built-in types])
-    MkPairData,
-    MkNilData,
-    MkNilPairData,
-}

src/builtins.rs

@@ -0,0 +1,78 @@
+use strum_macros::EnumString;
+
+#[allow(non_camel_case_types)]
+#[derive(Debug, Clone, EnumString)]
+#[strum(serialize_all = "camelCase")]
+pub enum DefaultFunction {
+    // Integer functions
+    AddInteger,
+    SubtractInteger,
+    MultiplyInteger,
+    DivideInteger,
+    QuotientInteger,
+    RemainderInteger,
+    ModInteger,
+    EqualsInteger,
+    LessThanInteger,
+    LessThanEqualsInteger,
+    // ByteString functions
+    AppendByteString,
+    ConsByteString,
+    SliceByteString,
+    LengthOfByteString,
+    IndexByteString,
+    EqualsByteString,
+    LessThanByteString,
+    LessThanEqualsByteString,
+    // Cryptography and hash functions
+    Sha2_256,
+    Sha3_256,
+    Blake2b_256,
+    VerifySignature,
+    VerifyEcdsaSecp256k1Signature,
+    VerifySchnorrSecp256k1Signature,
+    // String functions
+    AppendString,
+    EqualsString,
+    EncodeUtf8,
+    DecodeUtf8,
+    // Bool function
+    IfThenElse,
+    // Unit function
+    ChooseUnit,
+    // Tracing function
+    Trace,
+    // Pairs functions
+    FstPair,
+    SndPair,
+    // List functions
+    ChooseList,
+    MkCons,
+    HeadList,
+    TailList,
+    NullList,
+    // Data functions
+    // It is convenient to have a "choosing" function for a data type that has more than two
+    // constructors to get pattern matching over it and we may end up having multiple such data
+    // types, hence we include the name of the data type as a suffix.
+    ChooseData,
+    ConstrData,
+    MapData,
+    ListData,
+    IData,
+    BData,
+    UnConstrData,
+    UnMapData,
+    UnListData,
+    UnIData,
+    UnBData,
+    EqualsData,
+    SerialiseData,
+    // Misc constructors
+    // Constructors that we need for constructing e.g. Data. Polymorphic builtin
+    // constructors are often problematic (See note [Representable built-in
+    // functions over polymorphic built-in types])
+    MkPairData,
+    MkNilData,
+    MkNilPairData,
+}

src/lib.rs

@@ -1,4 +1,5 @@
 pub mod ast;
+pub mod builtins;
 pub mod cli;
 pub mod parser;
 

src/parser.rs

@@ -8,7 +8,10 @@ use combine::{
     token, EasyParser, ParseError, Parser, Stream,
 };
 
-use crate::ast::{Constant, DefaultFunction, Program, Term};
+use crate::{
+    ast::{Constant, Program, Term},
+    builtins::DefaultFunction,
+};
 
 pub fn program(src: &str) -> anyhow::Result<Program> {
     let mut parser = program_();
@@ -167,8 +170,7 @@ where
         token(')'),
         string("error")
             .with(skip_many1(space()))
-            .with(term_())
-            .map(|term| Term::Error(Box::new(term))),
+            .map(|_| Term::Error),
     )
 }