cairo-language-server 2.20.0

The Cairo Language Server
Documentation 
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/// LSP protocol is using a differential position encoding to report the tokens.
/// This encoder outputs this encoding.
#[derive(Default)]
pub struct TokenEncoder {
    /// Line number of the last encoded token.
    last_line: u32,
    /// Column number of the last encoded token.
    last_col: u32,
    /// Current line number.
    line: u32,
    /// Current column number.
    col: u32,
}
pub struct EncodedToken {
    pub delta_line: u32,
    pub delta_start: u32,
}
impl TokenEncoder {
    /// Skip a non newline token.
    pub fn skip(&mut self, width: u32) {
        self.col += width;
    }

    /// Moves to the next line.
    pub fn next_line(&mut self) {
        self.line += 1;
        self.col = 0;
    }

    /// Creates an [`EncodedToken`] token based on the current position and the width of the token.
    /// This updates the state of the encoder text positions.
    pub fn encode(&mut self, width: u32) -> EncodedToken {
        let delta_line = self.line - self.last_line;
        let prev_col = if delta_line > 0 { 0 } else { self.last_col };
        let delta_start = self.col - prev_col;
        self.last_line = self.line;
        self.last_col = self.col;
        self.skip(width);
        EncodedToken { delta_line, delta_start }
    }
}