microflow-macros 0.1.1

Macro crate of the MicroFlow inference engine, namely, the MicroFlow compiler
Documentation 
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use std::ops::Deref;

use nalgebra::DMatrix;
use proc_macro2::TokenStream as TokenStream2;
use quote::{quote, ToTokens};

/// Represents the tokenized version of the `Buffer2D`.
#[derive(Debug)]
pub(crate) struct TokenBuffer2D<T>(pub(crate) Option<DMatrix<T>>);

/// Represents the tokenized version of the `Buffer4D`.
#[derive(Debug)]
pub(crate) struct TokenBuffer4D<T>(pub(crate) Option<Vec<DMatrix<Vec<T>>>>);

impl<T> TokenBuffer2D<T> {
    /// Builds an empty [`TokenBuffer2D`].
    pub(crate) fn new() -> Self {
        Self(None)
    }
}

impl<T> From<DMatrix<T>> for TokenBuffer2D<T> {
    fn from(matrix: DMatrix<T>) -> Self {
        Self(Some(matrix))
    }
}

impl<T: ToTokens> ToTokens for TokenBuffer2D<T> {
    fn to_tokens(&self, tokens: &mut TokenStream2) {
        let mut rows: Vec<TokenStream2> = Vec::new();
        for row in self.row_iter() {
            let iter = row.iter();
            rows.push(quote!(#(#iter),*));
        }

        let ts = quote!(nalgebra::matrix![#(#rows);*]);
        ts.to_tokens(tokens);
    }
}

impl<T> Deref for TokenBuffer2D<T> {
    type Target = DMatrix<T>;
    fn deref(&self) -> &Self::Target {
        self.0.as_ref().unwrap()
    }
}

impl<T> TokenBuffer4D<T> {
    /// Builds an empty [`TokenBuffer4D`].
    pub(crate) fn new() -> Self {
        Self(None)
    }
}

impl<T> From<Vec<DMatrix<Vec<T>>>> for TokenBuffer4D<T> {
    fn from(data: Vec<DMatrix<Vec<T>>>) -> Self {
        Self(Some(data))
    }
}

impl<T: ToTokens> ToTokens for TokenBuffer4D<T> {
    fn to_tokens(&self, tokens: &mut TokenStream2) {
        let mut batches: Vec<TokenStream2> = Vec::new();
        for batch in self.iter() {
            let mut rows: Vec<TokenStream2> = Vec::new();
            for row in batch.row_iter() {
                let mut elements: Vec<TokenStream2> = Vec::new();
                for element in row.iter() {
                    let iter = element.iter();
                    elements.push(quote!([#(#iter),*]));
                }
                rows.push(quote!(#(#elements),*));
            }
            batches.push(quote!(nalgebra::matrix![#(#rows);*]));
        }

        let ts = quote!([#(#batches),*]);
        ts.to_tokens(tokens);
    }
}

impl<T> Deref for TokenBuffer4D<T> {
    type Target = Vec<DMatrix<Vec<T>>>;
    fn deref(&self) -> &Self::Target {
        self.0.as_ref().unwrap()
    }
}

#[cfg(test)]
mod tests {
    use nalgebra::dmatrix;

    use super::*;

    fn setup_2d() -> TokenBuffer2D<i8> {
        TokenBuffer2D::from(dmatrix![
            1, 2, 3;
            4, 5, 6
        ])
    }

    fn setup_4d() -> TokenBuffer4D<i8> {
        TokenBuffer4D::from(vec![
            dmatrix![
                vec![7,  8],  vec![9,  10], vec![11, 12];
                vec![13, 14], vec![15, 16], vec![17, 18]
            ],
            dmatrix![
                vec![19, 20], vec![21, 22], vec![23, 24];
                vec![25, 26], vec![27, 28], vec![29, 30]
            ],
        ])
    }

    #[test]
    fn buffer_2d_new() {
        assert_eq!(TokenBuffer2D::<i8>::new().0, None);
    }

    #[test]
    fn buffer_2d_from_matrix() {
        let matrix = dmatrix![1, 2, 3];
        assert_eq!(TokenBuffer2D::<i8>::from(matrix.clone()).0, Some(matrix));
    }

    #[test]
    fn buffer_2d_to_tokens() {
        let buffer = setup_2d();
        assert_eq!(
            buffer.to_token_stream().to_string(),
            quote! {
                nalgebra::matrix![
                    1i8, 2i8, 3i8;
                    4i8, 5i8, 6i8
                ]
            }
            .to_string()
        );
    }

    #[test]
    fn buffer_4d_new() {
        assert_eq!(TokenBuffer4D::<i8>::new().0, None);
    }

    #[test]
    fn buffer_4d_from_data() {
        let data = vec![dmatrix![vec![1], vec![2], vec![3]]];
        assert_eq!(TokenBuffer4D::<i8>::from(data.clone()).0, Some(data));
    }

    #[test]
    fn buffer_4d_to_tokens() {
        let buffer = setup_4d();
        assert_eq!(
            buffer.to_token_stream().to_string(),
            quote! {
                [
                    nalgebra::matrix![
                        [7i8,  8i8],  [9i8,  10i8], [11i8, 12i8];
                        [13i8, 14i8], [15i8, 16i8], [17i8, 18i8]
                    ],
                    nalgebra::matrix![
                        [19i8, 20i8], [21i8, 22i8], [23i8, 24i8];
                        [25i8, 26i8], [27i8, 28i8], [29i8, 30i8]
                    ]
                ]
            }
            .to_string()
        );
    }
}