Make tests not directly dependent on peg

schala-lang/src/parsing/mod.rs

@@ -5,6 +5,8 @@ mod test;
 
 use std::fmt;
 
+#[cfg(test)]
+use crate::ast::{Block, Expression};
 use crate::{
     ast::{ASTItem, AST},
     identifier::{Id, IdStore},
@@ -20,12 +22,17 @@ impl Parser {
     }
 
     pub(crate) fn parse(&mut self, input: &str) -> Result<AST, ParseError> {
-        use peg::str::LineCol;
+        peg_parser::schala_parser::program(input, self).map_err(ParseError::from_peg)
+    }
 
-        peg_parser::schala_parser::program(input, self).map_err(|err: peg::error::ParseError<LineCol>| {
-            let msg = err.to_string();
-            ParseError { msg, location: err.location.offset.into() }
-        })
+    #[cfg(test)]
+    fn expression(&mut self, input: &str) -> Result<Expression, ParseError> {
+        peg_parser::schala_parser::expression(input, self).map_err(ParseError::from_peg)
+    }
+
+    #[cfg(test)]
+    fn block(&mut self, input: &str) -> Result<Block, ParseError> {
+        peg_parser::schala_parser::block(input, self).map_err(ParseError::from_peg)
     }
 
     fn fresh(&mut self) -> Id<ASTItem> {
@@ -40,6 +47,13 @@ pub struct ParseError {
     pub location: Location,
 }
 
+impl ParseError {
+    fn from_peg(err: peg::error::ParseError<peg::str::LineCol>) -> Self {
+        let msg = err.to_string();
+        Self { msg, location: err.location.offset.into() }
+    }
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Default)]
 pub struct Location {
     pub(crate) offset: usize,

schala-lang/src/parsing/test.rs

@@ -6,7 +6,7 @@ use std::{fmt::Write, rc::Rc};
 
 use pretty_assertions::assert_eq;
 
-use super::{peg_parser::schala_parser, Parser};
+use super::Parser;
 use crate::{ast::*, parsing::Location};
 
 fn rc(s: &str) -> Rc<String> {
@@ -88,10 +88,10 @@ fn ty_simple(name: &str) -> TypeIdentifier {
 macro_rules! assert_ast {
     ($input:expr, $statements:expr) => {
         let mut parser = Parser::new();
-        let ast = schala_parser::program($input, &mut parser);
+        let ast = parser.parse($input);
         let expected = AST { id: Default::default(), statements: $statements.into() };
         if ast.is_err() {
-            println!("Parse error: {}", ast.unwrap_err());
+            println!("Parse error: {}", ast.unwrap_err().msg);
             panic!();
         }
         assert_eq!(ast.unwrap(), expected);
@@ -101,17 +101,17 @@ macro_rules! assert_ast {
 macro_rules! assert_fail {
     ($input:expr, $failure:expr) => {
         let mut parser = Parser::new();
-        let err = schala_parser::program($input, &mut parser).unwrap_err();
-        assert_eq!(err.to_string(), $failure);
+        let err = parser.parse($input).unwrap_err();
+        assert_eq!(err.msg, $failure);
     };
 }
 
 macro_rules! assert_expr {
     ($input:expr, $correct:expr) => {
         let mut parser = Parser::new();
-        let expr = schala_parser::expression($input, &mut parser);
+        let expr = parser.expression($input);
         if expr.is_err() {
-            println!("Expression parse error: {}", expr.unwrap_err());
+            println!("Expression parse error: {}", expr.unwrap_err().msg);
             panic!();
         }
         assert_eq!(expr.unwrap(), $correct);
@@ -121,7 +121,7 @@ macro_rules! assert_expr {
 macro_rules! assert_fail_expr {
     ($input:expr, $failure:expr) => {
         let mut parser = Parser::new();
-        let _err = schala_parser::expression($input, &mut parser).unwrap_err();
+        let _err = parser.expression($input).unwrap_err();
         //TODO make real tests for failures
         //assert_eq!(err.to_string(), $failure);
     };
@@ -1302,7 +1302,7 @@ fn blocks() {
 
     let mut parser = Parser::new();
     for case in cases.iter() {
-        let block = schala_parser::block(case, &mut parser);
+        let block = parser.block(case);
         assert_eq!(block.unwrap(), vec![exst(Value(qn!(a)))].into());
     }
 
@@ -1311,7 +1311,7 @@ fn blocks() {
     fn foo() { }
     }
     }"#;
-    let block = schala_parser::block(source, &mut parser);
+    let block = parser.block(source);
     assert_eq!(
         block.unwrap(),
         vec![decl(Declaration::FuncDecl(