darklua 0.18.0

Transform Lua scripts
Documentation 
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use crate::nodes::Token;

use super::{Type, TypedIdentifier};

/// Represents an identifier (variable name).
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct Identifier {
    name: String,
    token: Option<Token>,
}

impl Identifier {
    /// Creates a new identifier with the given name.
    pub fn new<S: Into<String>>(name: S) -> Self {
        Self {
            name: name.into(),
            token: None,
        }
    }

    /// Converts this identifier into a typed identifier.
    pub fn with_type(self, r#type: impl Into<Type>) -> TypedIdentifier {
        TypedIdentifier::from(self).with_type(r#type.into())
    }

    /// Attaches token information to this identifier.
    pub fn with_token(mut self, token: Token) -> Self {
        self.token = Some(token);
        self
    }

    /// Sets the token information for this identifier.
    #[inline]
    pub fn set_token(&mut self, token: Token) {
        self.token = Some(token);
    }

    /// Returns a reference to the token information attached to this identifier, if any.
    #[inline]
    pub fn get_token(&self) -> Option<&Token> {
        self.token.as_ref()
    }

    /// Returns a mutable reference to the token information attached to this identifier, if any.
    #[inline]
    pub fn mutate_token(&mut self) -> Option<&mut Token> {
        self.token.as_mut()
    }

    /// Returns a mutable reference to the token information attached to this identifier.
    /// If no token is attached, it creates one from the name.
    pub(crate) fn mutate_or_insert_token(&mut self) -> &mut Token {
        if self.token.is_none() {
            let name = self.get_name().to_owned();
            self.token = Some(Token::from_content(name));
        }
        self.token.as_mut().unwrap()
    }

    /// Returns a reference to the name of this identifier.
    #[inline]
    pub fn get_name(&self) -> &String {
        &self.name
    }

    /// Returns a mutable reference to the name of this identifier.
    #[inline]
    pub fn mutate_name(&mut self) -> &mut String {
        &mut self.name
    }

    /// Changes the name of this identifier.
    ///
    /// If token information is attached, it's updated to reflect the new name.
    #[inline]
    pub fn set_name<IntoString: Into<String>>(&mut self, name: IntoString) {
        let name = name.into();
        if let Some(token) = &mut self.token {
            token.replace_with_content(name.clone());
        }
        self.name = name;
    }

    /// Consumes the identifier and returns just the name as a String.
    #[inline]
    pub fn into_name(self) -> String {
        self.name
    }

    super::impl_token_fns!(iter = [token]);
}

impl<IntoString: Into<String>> From<IntoString> for Identifier {
    fn from(identifier: IntoString) -> Self {
        Self {
            name: identifier.into(),
            token: None,
        }
    }
}

#[cfg(test)]
mod test {
    use crate::nodes::Position;

    use super::*;

    #[test]
    fn set_name_replaces_the_token_content() {
        let token = Token::new_with_line(7, 10, 1);
        let mut identifier = Identifier::new("var").with_token(token);

        identifier.set_name("newVar");

        assert_eq!(
            identifier.get_token().unwrap(),
            &Token::from_position(Position::LineNumber {
                line_number: 1,
                content: "newVar".into(),
            })
        );
    }
}