logo-interp 0.1.0

Implements parsing and interpreting of Logo programming language
Documentation 
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use std::fmt::{Display, Formatter};

#[derive(Debug, Clone, PartialEq)]
pub struct Word(pub String);

#[derive(Debug, Clone, PartialEq)]
pub enum LogoValue {
    Word(Word),
    String(String),
    List(Vec<LogoValue>)
}

impl Display for LogoValue {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            LogoValue::Word(word) => write!(f, "{}", word.0),
            LogoValue::String(str) => write!(f, "{}", str),
            LogoValue::List(list) => {
                write!(f, "[")?;
                let str_vec: Vec<String> = list.iter().map(|x| format!("{}", x)).collect();
                write!(f, "{}", str_vec.join(" "))?;
                write!(f, "]")?;
                Ok(())
            }
        }
    }
}

#[derive(Clone, PartialEq)]
pub struct LogoProcedure {
    pub arg_names: Vec<String>,
    pub code: Vec<LogoValue>
}

pub trait LogoConvertible {
    fn to_logo(&self) -> LogoValue;
    fn from_logo(value: LogoValue) -> Result<Self, String> where Self: Sized;
}

impl LogoConvertible for LogoValue {
    fn to_logo(&self) -> LogoValue {
        return self.clone();
    }

    fn from_logo(value: LogoValue) -> Result<Self, String> {
        return Ok(value);
    }
}

impl LogoConvertible for String {
    fn to_logo(&self) -> LogoValue {
        return LogoValue::String(self.clone());
    }

    fn from_logo(value: LogoValue) -> Result<Self, String> {
        match value {
            LogoValue::String(val) => Ok(val),
            _ => Err("Type mismatch".to_string())
        }
    }
}

impl LogoConvertible for Word {
    fn to_logo(&self) -> LogoValue {
        return LogoValue::Word(self.clone());
    }

    fn from_logo(value: LogoValue) -> Result<Self, String> {
        match value {
            LogoValue::Word(val) => Ok(val),
            _ => Err("Type mismatch".to_string())
        }
    }
}

impl LogoConvertible for f64 {
    fn to_logo(&self) -> LogoValue {
        return LogoValue::Word(Word(self.to_string()));
    }

    fn from_logo(value: LogoValue) -> Result<Self, String> {
        match value {
            LogoValue::Word(val) => {
                match val.0.parse::<f64>() {
                    Ok(val) => Ok(val),
                    _ => Err("Type mismatch".to_string())
                }
            },
            _ => Err("Type mismatch".to_string())
        }
    }
}

impl LogoConvertible for i32 {
    fn to_logo(&self) -> LogoValue {
        return LogoValue::Word(Word(self.to_string()));
    }

    fn from_logo(value: LogoValue) -> Result<Self, String> {
        match value {
            LogoValue::Word(val) => {
                match val.0.parse::<i32>() {
                    Ok(val) => Ok(val),
                    _ => Err("Type mismatch".to_string())
                }
            },
            _ => Err("Type mismatch".to_string())
        }
    }
}

impl LogoConvertible for bool {
    fn to_logo(&self) -> LogoValue {
        return LogoValue::Word(Word(self.to_string()));
    }

    fn from_logo(value: LogoValue) -> Result<Self, String> {
        match value {
            LogoValue::Word(val) => {
                match val.0.parse::<bool>() {
                    Ok(val) => Ok(val),
                    _ => Err("Type mismatch".to_string())
                }
            },
            _ => Err("Type mismatch".to_string())
        }
    }
}

impl<T: LogoConvertible> LogoConvertible for Vec<T> {
    fn to_logo(&self) -> LogoValue {
        let mut res = Vec::with_capacity(self.len());
        for value in self {
            res.push(value.to_logo());
        }
        return LogoValue::List(res);
    }

    fn from_logo(value: LogoValue) -> Result<Self, String> {
        match value {
            LogoValue::List(list) => {
                let mut res = Vec::with_capacity(list.len());
                for value in list {
                    res.push(T::from_logo(value)?);
                }
                Ok(res)
            },
            _ => Err("Type mismatch".to_string())
        }
    }
}