Construct ArrayStorage directly in matrix![]
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@ -4,9 +4,12 @@ use syn::{Expr};
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use syn::parse::{Parse, ParseStream, Result, Error};
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use syn::punctuated::{Punctuated};
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use syn::{parse_macro_input, Token};
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use quote::{quote, format_ident};
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use quote::{quote, TokenStreamExt};
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use proc_macro::TokenStream;
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use proc_macro2::{TokenStream as TokenStream2, Delimiter, TokenTree, Spacing};
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use proc_macro2::{Group, Punct};
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struct Matrix {
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// Represent the matrix as a row-major vector of vectors of expressions
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rows: Vec<Vec<Expr>>,
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@ -22,14 +25,18 @@ impl Matrix {
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self.ncols
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}
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fn to_col_major_repr(&self) -> Vec<Expr> {
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let mut data = Vec::with_capacity(self.nrows() * self.ncols());
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/// Produces a stream of tokens representing this matrix as a column-major array.
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fn col_major_array_tokens(&self) -> TokenStream2 {
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let mut result = TokenStream2::new();
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for j in 0 .. self.ncols() {
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for i in 0 .. self.nrows() {
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data.push(self.rows[i][j].clone());
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let mut col = TokenStream2::new();
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let col_iter = (0 .. self.nrows())
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.map(move |i| &self.rows[i][j]);
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col.append_separated(col_iter, Punct::new(',', Spacing::Alone));
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result.append(Group::new(Delimiter::Bracket, col));
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result.append(Punct::new(',', Spacing::Alone));
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}
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}
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data
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TokenStream2::from(TokenTree::Group(Group::new(Delimiter::Bracket, result)))
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}
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}
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@ -79,13 +86,16 @@ pub fn matrix(stream: TokenStream) -> TokenStream {
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let row_dim = matrix.nrows();
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let col_dim = matrix.ncols();
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let entries_col_major = matrix.to_col_major_repr();
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let array_tokens = matrix.col_major_array_tokens();
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// TODO: Use quote_spanned instead??
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// TODO: Construct directly from array?
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// TODO: Avoid use of unsafe here
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let output = quote! {
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unsafe {
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nalgebra::SMatrix::<_, #row_dim, #col_dim>
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::from_column_slice(&[#(#entries_col_major),*])
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::from_data_statically_unchecked(nalgebra::ArrayStorage(#array_tokens))
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}
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};
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proc_macro::TokenStream::from(output)
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@ -1,5 +1,5 @@
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use nalgebra_macros::matrix;
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use nalgebra::{SMatrix, Matrix3x2, U0, U1, Matrix1x2, Matrix1x3, Matrix1x4, Matrix2x1, Matrix2, Matrix2x3, Matrix2x4, Matrix3x1, Matrix3, Matrix3x4, Matrix4x1, Matrix4x2, Matrix4x3, Matrix4};
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use nalgebra::{SMatrix, Matrix3x2, Matrix1x2, Matrix1x3, Matrix1x4, Matrix2x1, Matrix2, Matrix2x3, Matrix2x4, Matrix3x1, Matrix3, Matrix3x4, Matrix4x1, Matrix4x2, Matrix4x3, Matrix4};
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#[test]
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fn matrix_small_dims_exhaustive() {
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