chap 2.5.0

Chap is an easy to learn, interpretive, scripting language written in Rust
Documentation 
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use crate::common::errors::Result;
use crate::{
    common::{data_type::DataType, errors::ChapError, executable::ExecutableLine, param::Param},
    runtime::Runtime,
};

#[allow(dead_code)]
pub fn get_var(runtime: &Runtime, name: &str, line_number: u32) -> Result<DataType> {
    match runtime.variables.get(name) {
        Some(x) => Ok(x.clone()),
        None => Err(ChapError::runtime_with_msg(
            line_number,
            format!("variable {} is not defend", name),
        )),
    }
}

pub fn param_to_datatype<'a>(
    runtime: &'a Runtime,
    param: Option<&'a Param>,
    line_number: u32,
) -> Result<&'a DataType> {
    let param = match param {
        Some(x) => x,
        None => {
            return Err(ChapError::static_analyzer_with_msg(
                line_number,
                "function needs more params".to_string(),
            ))
        }
    };

    match param {
        Param::Tag(_, _) => Err(ChapError::runtime_with_msg(
            line_number,
            "can not convert a tag to datatype".to_string(),
        )),
        Param::Value(value) => Ok(value),
        Param::Variable(name) => match runtime.variables.get(name) {
            Some(x) => Ok(x),
            None => Err(ChapError::runtime_with_msg(
                line_number,
                format!("variable {} is not defend", name),
            )),
        },
    }
}

pub fn param_to_datatype_mut<'a>(
    runtime: &'a mut Runtime,
    param: Option<&'a Param>,
    line_number: u32,
) -> Result<&'a mut DataType> {
    let param = match param {
        Some(x) => x,
        None => {
            return Err(ChapError::static_analyzer_with_msg(
                line_number,
                "function needs more params".to_string(),
            ))
        }
    };

    match param {
        Param::Tag(_, _) => Err(ChapError::runtime_with_msg(
            line_number,
            "can not convert a tag to datatype".to_string(),
        )),
        Param::Value(_) => Err(ChapError::runtime_with_msg(
            line_number,
            "variable expected.".to_string(),
        )),
        Param::Variable(name) => match runtime.variables.get_mut(name) {
            Some(x) => Ok(x),
            None => Err(ChapError::runtime_with_msg(
                line_number,
                format!("variable {} is not defend", name),
            )),
        },
    }
}

pub fn returns(runtime: &mut Runtime, executable: &ExecutableLine, result: DataType) -> Result<()> {
    if let Some(var_name) = &executable.output_var {
        runtime.variables.insert(var_name.clone(), result);
    } else {
        runtime.std_out(result.to_string().as_str());
    }
    Ok(())
}