diff --git a/hbasm/src/lib.rs b/hbasm/src/lib.rs
index aba245e..cd3553d 100644
--- a/hbasm/src/lib.rs
+++ b/hbasm/src/lib.rs
@@ -33,7 +33,6 @@ macros::impl_both!(
         => [NOP, ECALL],
 );
 
-
 pub trait Imm {
     fn insert(&self, asm: &mut Assembler);
 }
diff --git a/hbasm/src/macros/text.rs b/hbasm/src/macros/text.rs
index ffa2df0..2bc0c5c 100644
--- a/hbasm/src/macros/text.rs
+++ b/hbasm/src/macros/text.rs
@@ -8,8 +8,12 @@ macro_rules! gen_text {
     ) => {
         pub mod text {
             use {
+                crate::{
+                    Assembler,
+                    macros::text::*,
+                },
                 lasso::{Rodeo, Spur},
-                logos::Logos,
+                logos::{Lexer, Logos, Span},
             };
 
             paste::paste!(literify::literify! {
@@ -52,8 +56,93 @@ macro_rules! gen_text {
                     #[token(",")] PSep,
                 }
             });
+
+            #[derive(Copy, Clone, Debug, PartialEq, Eq)]
+            pub enum ErrorKind {
+                UnexpectedToken,
+                InvalidToken,
+                UnexpectedEnd,
+                InvalidSymbol,
+            }
+
+            #[derive(Clone, Debug, PartialEq, Eq)]
+            pub struct Error {
+                pub kind: ErrorKind,
+                pub span: Span,
+            }
+
+            pub fn assemble(asm: &mut Assembler, code: &str) -> Result<(), Error> {
+                fn next(lexer: &mut Lexer<Token>) -> Result<Token, ErrorKind> {
+                    match lexer.next() {
+                        Some(Ok(t))   => Ok(t),
+                        Some(Err(())) => Err(ErrorKind::InvalidToken),
+                        None          => Err(ErrorKind::UnexpectedEnd),
+                    }
+                }
+
+                #[inline(always)]
+                fn inner(asm: &mut Assembler, lexer: &mut Lexer<Token>) -> Result<(), ErrorKind> {
+                    loop {
+                        match lexer.next() {
+                            Some(Ok(Token::Opcode(op))) => {
+                                match op {
+                                    $(
+                                        $(hbbytecode::opcode::$opcode)|* => paste::paste!({
+                                            param_extract_iim!(lexer, $($param_i: $param_ty),*);
+                                            asm.[<i_param_ $ityn>](op, $($param_i),*);
+                                        }),
+                                    )*
+                                    _ => unreachable!(),
+                                }
+                            }
+                            Some(Ok(Token::Label(_))) => {
+                                todo!("Labels");
+                            }
+                            Some(Ok(Token::ISep)) => (),
+                            Some(Ok(_))           => return Err(ErrorKind::UnexpectedToken),
+                            Some(Err(()))         => return Err(ErrorKind::InvalidToken),
+                            None                  => return Ok(()),
+                        }
+                    }
+                }
+
+                let mut lexer = Token::lexer(code);
+                inner(asm, &mut lexer)
+                    .map_err(|kind| Error { kind, span: lexer.span() })
+            }
         }
     };
 }
 
-pub(crate) use gen_text;
+macro_rules! extract_pat {
+    ($lexer:expr, $pat:pat) => {
+        let $pat = next($lexer)?
+            else { return Err(ErrorKind::UnexpectedToken) };
+    };
+}
+
+macro_rules! extract {
+    ($lexer:expr, R, $id:ident) => {
+        extract_pat!($lexer, Token::Register($id));
+    };
+    ($lexer:expr, I, $id:ident) => {
+        extract_pat!($lexer, Token::Integer($id));
+    };
+    ($lexer:expr, u16, $id:ident) => {
+        extract_pat!($lexer, Token::Integer($id));
+        let $id = u16::try_from($id)
+            .map_err(|_| ErrorKind::InvalidToken)?;
+    };
+}
+
+macro_rules! param_extract_iim {
+    ($lexer:expr, $($id:ident: $ty:ident)? $(, $($tt:tt)*)?) => {
+        $(extract!($lexer, $ty, $id);)?
+        $(
+            extract_pat!($lexer, Token::PSep);
+            param_extract_iim!($lexer, $($tt)*);
+        )?
+    };
+}
+
+pub(crate) use {extract, extract_pat, gen_text, param_extract_iim};