Split module into ast and parser

1 files changed, 27 insertions, 0 deletions

diff --git a/rust/src/parser.rs b/rust/src/parser.rs
new file mode 100644
index 0000000..d5d4c30
--- /dev/null
+++ b/rust/src/parser.rs
@@ -0,0 +1,27 @@
+use crate::ast::*;
+
+pub fn parse(arg: &str) -> Value {
+    let token = arg.trim();
+    parse_number(token)
+        .or(parse_bool(token))
+        .or(parse_symbol(token))
+        .unwrap()
+}
+
+fn parse_symbol(token: &str) -> Result<Value, String> {
+    Ok(Value::Sym(token.to_string()))
+}
+
+fn parse_bool(token: &str) -> Result<Value, String> {
+    token
+        .parse::<bool>()
+        .map(Value::Bool)
+        .map_err(|e| e.to_string())
+}
+
+fn parse_number(token: &str) -> Result<Value, String> {
+    token
+        .parse::<i32>()
+        .map(Value::Num)
+        .map_err(|e| e.to_string())
+}