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(())
 }

src/vm/syn/ast.rs

@@ -1,4 +1,4 @@
-use crate::vm::{inst::Inst, reg::Reg};
+use crate::vm::inst::Inst;
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum Line {
@@ -10,6 +10,7 @@ pub enum Line {
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub enum Directive {
     Section(String),
+    Org(Value),
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]

src/vm/syn/parser.lalrpop

@@ -17,7 +17,7 @@ Value: Value = {
 }
 
 Label: String = {
-    "[a-zA-Z]+" => String::from(<>),
+    r"[a-zA-Z]+" => String::from(<>),
 }
 
 Number: u64 = {
@@ -69,11 +69,16 @@ Inst: Inst = {
 }
 
 Directive: Directive = {
-    ".section" <s:Label> => Directive::Section(s.to_string()),
+    r"\.section" <s:Label> => Directive::Section(s.to_string()),
+    r"\.org" <v:Value> => Directive::Org(v),
 }
 
-pub Line: Line = {
+Line: Line = {
     <Directive> => Line::Directive(<>),
     <Inst> => Line::Inst(<>),
     <LabelDef> => Line::LabelDef(<>),
 }
+
+pub Program: Vec<Line> = {
+    <Line*> => <>,
+}