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extern crate proc_macro;
use expry::memorypool::*;
use expry::*;
use litrs::StringLit;
use quote::*;
fn first_string(tokens: proc_macro2::TokenStream) -> String {
for i in tokens {
if let Ok(lit) = StringLit::try_from(i) {
return lit.value().to_string();
}
}
String::new()
}
#[proc_macro]
pub fn expry(input: proc_macro::TokenStream) -> proc_macro::TokenStream {
let input = proc_macro2::TokenStream::from(input);
let expr = first_string(input);
let mut allocator = MemoryPool::new();
let mut scope = allocator.rewind();
let bytecode = expry_compile(&expr, None, &mut scope);
match bytecode {
Ok(bytecode) => {
let lit = proc_macro2::Literal::byte_string(bytecode.get());
quote!{ expry::BytecodeRef(#lit) }.into()
},
Err(err) => {
let msg = expry_compile_error_format_short(&expr, &err);
compile_error_as_expr(&msg)
},
}
}
#[allow(dead_code)]
fn compile_error(string: &str) -> proc_macro::TokenStream {
let expanded = quote!(
compile_error!(#string);
);
proc_macro::TokenStream::from(expanded)
}
fn compile_error_as_expr(string: &str) -> proc_macro::TokenStream {
let expanded = quote!(
compile_error!(#string)
);
proc_macro::TokenStream::from(expanded)
}
#[cfg(nightly_build)]
#[allow(dead_code)]
fn compile_warning(span: proc_macro2::Span, message: &str) {
Diagnostic::spanned(span.unwrap(), proc_macro::Level::Warning, message)
.emit();
}
#[cfg(not(nightly_build))]
#[allow(dead_code)]
fn compile_warning(_span: proc_macro2::Span, _message: &str) {
}
#[cfg(nightly_build)]
#[allow(dead_code)]
fn compile_error_at(span: proc_macro2::Span, message: &str) {
Diagnostic::spanned(span.unwrap(), proc_macro::Level::Error, message)
.emit();
}
#[cfg(not(nightly_build))]
#[allow(dead_code)]
fn compile_error_at(_span: proc_macro2::Span, _message: &str) {
}
#[cfg(test)]
mod tests {
}