Add lexer dump to main and fix a couple of bugs

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

src/main.rs

@@ -2,6 +2,29 @@ mod common;
 //mod syn;
 mod vm;
 
-fn main() {
-    println!("Hello, world!");
+use std::{
+    io::{self, Read},
+    process,
+};
+
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
+
+fn get_input_string() -> io::Result<String> {
+    let mut buffer = String::new();
+    io::stdin().read_to_string(&mut buffer)?;
+    Ok(buffer)
+}
+
+fn main() -> Result<()> {
+    use vm::syn::parser::ProgramParser;
+    let contents = get_input_string()?;
+    let ast = match ProgramParser::new().parse(&contents) {
+        Ok(ast) => ast,
+        Err(err) => {
+            eprintln!("{}", err);
+            process::exit(1);
+        },
+    };
+    println!("{:?}", ast);
+    Ok(())
 }