Added parse_to_ast for public use from other modules

1 files changed, 23 insertions, 0 deletions

diff --git a/src/parse/parsetree.rs b/src/parse/parsetree.rs
index 46317a4..7e1c80d 100644
--- a/src/parse/parsetree.rs
+++ b/src/parse/parsetree.rs
@@ -151,6 +151,15 @@ fn tokens_to_ast_inner(
     Ok((input.into(), res))
 }
 
+pub fn parse_to_ast(s: &str) -> Result<SExp, String> {
+    let tokens = match tokenize(s) {
+	Ok(t) => Ok(t),
+	Err(e) => Err(format!("error in tokenization: {}", e)),
+    }?;
+
+    tokens_to_ast(tokens.into())
+}
+
 
 #[cfg(test)]
 mod private_parsing_tests {
@@ -318,4 +327,18 @@ mod private_parsing_tests {
 	);
     }
 
+    #[test]
+    fn test_parse_to_ast() {
+	assert_eq!(
+	    parse_to_ast("(* 2 (+ 3 4))"),
+	    Ok(scons(scons(
+		Mul,
+		scons(
+		    2,
+		    scons(scons(Add, scons(3, scons(4, Nil))), Nil)
+		)
+	    ), Nil))
+	);
+    }
+
 }