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extern crate proc_macro;
use lalrpop_util::ParseError;
use proc_macro::TokenStream;
use quote::quote;
use syn::parse_macro_input;
const MAX_PROGRAM_SIZE: usize = 1024;
struct PioMacroArgs {
program_size: syn::Expr,
_comma: syn::token::Comma,
source: syn::LitStr,
}
impl syn::parse::Parse for PioMacroArgs {
fn parse(stream: syn::parse::ParseStream) -> syn::parse::Result<Self> {
Ok(Self {
program_size: stream.parse()?,
_comma: stream.parse()?,
source: stream.parse()?,
})
}
}
#[proc_macro]
pub fn pio(item: TokenStream) -> TokenStream {
let args = parse_macro_input!(item as PioMacroArgs);
let result =
match pio_parser::Parser::<{ MAX_PROGRAM_SIZE }>::parse_program(&args.source.value()) {
Ok(pio::ProgramWithDefines {
program,
public_defines,
}) => {
let origin: proc_macro2::TokenStream =
format!("{:?}", program.origin).parse().unwrap();
let code: proc_macro2::TokenStream = format!(
"::core::iter::IntoIterator::into_iter([{}]).collect()",
program
.code
.iter()
.map(|v| v.to_string())
.collect::<Vec<String>>()
.join(",")
)
.parse()
.unwrap();
let wrap: proc_macro2::TokenStream = format!(
"::pio::Wrap {{source: {}, target: {}}}",
program.wrap.source, program.wrap.target
)
.parse()
.unwrap();
let side_set: proc_macro2::TokenStream = format!(
"::pio::SideSet::new_from_proc_macro({}, {}, {})",
program.side_set.optional(),
program.side_set.bits(),
program.side_set.pindirs()
)
.parse()
.unwrap();
let defines_struct: proc_macro2::TokenStream = format!(
"
struct ExpandedDefines {{
{}
}}
",
public_defines
.keys()
.map(|k| format!("{}: i32,", k))
.collect::<Vec<String>>()
.join("\n")
)
.parse()
.unwrap();
let defines_init: proc_macro2::TokenStream = format!(
"
ExpandedDefines {{
{}
}}
",
public_defines
.iter()
.map(|(k, v)| format!("{}: {},", k, v))
.collect::<Vec<String>>()
.join("\n")
)
.parse()
.unwrap();
let program_size = args.program_size;
quote! {
{
#defines_struct
::pio::ProgramWithDefines {
program: ::pio::Program::<{ #program_size }> {
code: #code,
origin: #origin,
wrap: #wrap,
side_set: #side_set,
},
public_defines: #defines_init,
}
}
}
}
Err(e) => {
let files =
codespan_reporting::files::SimpleFile::new("source", args.source.value());
let (loc, messages) = match e {
ParseError::InvalidToken { location } => {
(location..location, vec!["invalid token".to_string()])
}
ParseError::UnrecognizedEOF { location, expected } => (
location..location,
vec![
"unrecognized eof".to_string(),
format!("expected one of {}", expected.join(", ")),
],
),
ParseError::UnrecognizedToken { token, expected } => (
token.0..token.2,
vec![
format!("unexpected token: {:?}", format!("{}", token.1)),
format!("expected one of {}", expected.join(", ")),
],
),
ParseError::ExtraToken { token } => {
(token.0..token.2, vec![format!("extra token: {}", token.1)])
}
ParseError::User { error } => (0..0, vec![error.to_string()]),
};
let diagnostic = codespan_reporting::diagnostic::Diagnostic::error()
.with_message(messages[0].clone())
.with_labels(
messages
.iter()
.enumerate()
.map(|(i, m)| {
codespan_reporting::diagnostic::Label::new(
if i == 0 {
codespan_reporting::diagnostic::LabelStyle::Primary
} else {
codespan_reporting::diagnostic::LabelStyle::Secondary
},
(),
loc.clone(),
)
.with_message(m)
})
.collect(),
);
let mut writer = codespan_reporting::term::termcolor::Buffer::ansi();
let config = codespan_reporting::term::Config::default();
codespan_reporting::term::emit(&mut writer, &config, &files, &diagnostic).unwrap();
let data = writer.into_inner();
let data = std::str::from_utf8(&data).unwrap();
quote! {
compile_error!(#data)
}
}
};
TokenStream::from(result)
}
