start assembler

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "oxvm"
+version = "0.1.0"

Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "oxvm"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/asm.rs

@@ -0,0 +1,44 @@
+use std::u32;
+pub struct Assembler {
+    startaddr: u32,
+}
+impl Assembler {
+    pub fn new() -> Self {
+        Self { startaddr: 0 }
+    }
+    pub fn assemble(&mut self, code: String) {
+        for line in code.lines() {
+            match line.trim_start().chars().next() {
+                Some(character) => match character {
+                    '.' => Self::directive(self, line.trim_start()),
+                    _ => Self::code(line.trim_start()),
+                },
+                None => {
+                    println!("Empty line.")
+                }
+            }
+        }
+    }
+    fn directive(&mut self, line: &str) {
+        let mut tokens = line.split_whitespace();
+        match tokens.next() {
+            Some(token) => match token {
+                ".start" => {
+                    let straddr = tokens.next().expect("No address for .start!");
+                    let addr = u32::from_str_radix(
+                        match straddr.strip_prefix("0x") {
+                            Some(stripped) => stripped,
+                            None => straddr,
+                        },
+                        16,
+                    )
+                    .expect("Error parsing address!");
+                    self.startaddr = addr;
+                }
+                _ => println!("Unknown directive: {}", token),
+            },
+            None => println!("Empty directive?"),
+        }
+    }
+    fn code(line: &str) {}
+}

src/main.rs

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+use std::env::args;
+use std::fs::read_to_string;
+mod asm;
+use asm::Assembler;
+mod opcodes;
+/*
+ * oxvm asm prog.asm prog.bin
+ * oxvm prog.bin
+ */
+
+fn main() {
+    let mut arguments = args();
+    arguments.next();
+    match arguments.next() {
+        Some(filename) => {
+            println!("Filename: {}", filename);
+            let mut asmb = Assembler::new();
+            asmb.assemble(read_to_string(filename).expect("Failed to read file!"));
+        }
+        None => println!("No file specified"),
+    }
+}

src/opcodes.rs

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+pub enum Opcodes {
+    Goto,
+}

test.asm

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+# start memory address
+.start 0x0000
+
+.label loop
+    goto loop