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49 lines
1.6 KiB
49 lines
1.6 KiB
use std::fmt::{self, Display, Formatter};
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use crate::asm::error::CrsnError;
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/// Register name
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#[derive(Debug, Clone, Copy, Eq, PartialEq, Hash)]
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pub enum Register {
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/// Argument register, read-only
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Arg(u8),
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/// Result register, read-only
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Res(u8),
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/// General purpose register
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Gen(u8),
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}
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impl Display for Register {
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fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
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match self {
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Register::Arg(n) => write!(f, "arg{}", n),
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Register::Res(n) => write!(f, "res{}", n),
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Register::Gen(n) => write!(f, "r{}", n),
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}
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}
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}
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pub fn parse_reg(name: &str) -> anyhow::Result<Register> {
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// TODO deduplicate code
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if let Some(rn) = name.strip_prefix("arg") {
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if rn.chars().find(|c: &char| !c.is_ascii_digit()).is_some() {
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Err(CrsnError::Parse(format!("Bad register: {}", name).into()))?;
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}
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let val: u8 = rn.parse()?;
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Ok(Register::Arg(val))
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} else if let Some(rn) = name.strip_prefix("res") {
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if rn.chars().find(|c: &char| !c.is_ascii_digit()).is_some() {
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Err(CrsnError::Parse(format!("Bad register: {}", name).into()))?;
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}
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let val: u8 = rn.parse()?;
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Ok(Register::Res(val))
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} else if let Some(rn) = name.strip_prefix("r") {
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if rn.chars().find(|c: &char| !c.is_ascii_digit()).is_some() {
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Err(CrsnError::Parse(format!("Bad register: {}", name).into()))?;
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}
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let val: u8 = rn.parse()?;
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Ok(Register::Gen(val))
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} else {
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Err(CrsnError::Parse(format!("Bad reg name: {}", name).into()))?
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}
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}
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