moduforge-transform 0.2.4

不可变数据结构与事务系统基础
Documentation 
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use std::{fmt, sync::Arc};

use super::step::{Step, StepResult};

// 定义 TransformError 结构体
#[derive(Debug)]
pub struct TransformError {
    message: String,
}
impl fmt::Display for TransformError {
    fn fmt(
        &self,
        f: &mut fmt::Formatter,
    ) -> fmt::Result {
        write!(f, "{}", self.message)
    }
}
impl std::error::Error for TransformError {}

impl TransformError {
    pub fn new(message: String) -> Self {
        TransformError { message }
    }
}

pub trait Transform {
    fn step(
        &mut self,
        step: Arc<dyn Step>,
    ) -> Result<(), TransformError>;
    fn doc_changed(&self) -> bool;
    fn add_step(
        &mut self,
        step: Arc<dyn Step>,
        result: StepResult,
    );
}