harn-vm 0.7.22

Async bytecode virtual machine for the Harn programming language
Documentation 
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use crate::chunk::Op;
use crate::value::VmError;

impl super::super::Vm {
    pub(super) fn try_execute_control_flow_op(&mut self, op: u8) -> Result<bool, VmError> {
        if op == Op::Jump as u8 {
            let frame = self.frames.last_mut().unwrap();
            let target = frame.chunk.read_u16(frame.ip) as usize;
            frame.ip = target;
        } else if op == Op::JumpIfFalse as u8 {
            let frame = self.frames.last_mut().unwrap();
            let target = frame.chunk.read_u16(frame.ip) as usize;
            frame.ip += 2;
            let val = self.peek()?;
            if !val.is_truthy() {
                let frame = self.frames.last_mut().unwrap();
                frame.ip = target;
            }
        } else if op == Op::JumpIfTrue as u8 {
            let frame = self.frames.last_mut().unwrap();
            let target = frame.chunk.read_u16(frame.ip) as usize;
            frame.ip += 2;
            let val = self.peek()?;
            if val.is_truthy() {
                let frame = self.frames.last_mut().unwrap();
                frame.ip = target;
            }
        } else {
            return Ok(false);
        }
        Ok(true)
    }
}