chap 2.5.0

Chap is an easy to learn, interpretive, scripting language written in Rust
Documentation 
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#![allow(dead_code)]

#[derive(PartialEq, Debug, Clone)]
pub enum ErrorType {
    Syntax,
    StaticAnalyzer,
    Runtime,
    NothingToExecute,
    Stop,
}

impl ErrorType {
    pub fn to_string(&self) -> &str {
        match *self {
            ErrorType::Syntax => "syntax",
            ErrorType::StaticAnalyzer => "static analyzer",
            ErrorType::Runtime => "runtime",
            ErrorType::NothingToExecute => "no more lines to execute",
            ErrorType::Stop => "stop",
        }
    }
}

#[derive(PartialEq, Debug, Clone)]
pub struct ChapError {
    line_number: u32,
    msg: Option<String>,
    pub err_type: ErrorType,
}

pub type Result<T> = core::result::Result<T, ChapError>;

impl ChapError {
    pub fn syntax_with_msg(line_number: u32, msg: String) -> Self {
        Self {
            line_number,
            msg: Some(msg),
            err_type: ErrorType::Syntax,
        }
    }
    pub fn static_analyzer_with_msg(line_number: u32, msg: String) -> Self {
        Self {
            line_number,
            msg: Some(msg),
            err_type: ErrorType::StaticAnalyzer,
        }
    }
    pub fn runtime_with_msg(line_number: u32, msg: String) -> Self {
        Self {
            line_number,
            msg: Some(msg),
            err_type: ErrorType::Runtime,
        }
    }

    pub fn syntax(line_number: u32) -> Self {
        Self {
            line_number,
            msg: None,
            err_type: ErrorType::Syntax,
        }
    }
    pub fn static_analyzer(line_number: u32) -> Self {
        Self {
            line_number,
            msg: None,
            err_type: ErrorType::StaticAnalyzer,
        }
    }
    pub fn runtime(line_number: u32) -> Self {
        Self {
            line_number,
            msg: None,
            err_type: ErrorType::Runtime,
        }
    }
    pub fn no_more_line() -> Self {
        Self {
            line_number: 0,
            msg: None,
            err_type: ErrorType::NothingToExecute,
        }
    }
    pub fn stop() -> Self {
        Self {
            line_number: 0,
            msg: None,
            err_type: ErrorType::Stop,
        }
    }

    pub fn exit_with_error(&self) {
        println!("{}", self.error_message());
        panic!();
    }

    // on the REPL mode we should not shut the whole interpreter down
    pub fn show_warning(&self) {
        println!("{}", self.error_message());
    }

    pub fn error_message(&self) -> String {
        let mut result = String::new();
        result.push_str(&format!(
            "\t{} Error on line: {}",
            self.err_type.to_string(),
            self.line_number
        ));
        if let Some(msg) = &self.msg {
            result.push_str(&format!("\terror message: {} ", msg));
        }
        result
    }
}