40 lines
859 B
Rust
40 lines
859 B
Rust
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use proc_macro2::{TokenStream, Span};
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use quote::{quote_spanned, ToTokens};
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macro_rules! err_span {
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($span:expr, $($msg:tt)*) => (
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$crate::error::CompileError::new_spanned(&$span, format!($($msg)*))
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)
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}
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pub struct CompileError {
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msg: String,
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span: Option<Span>,
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}
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impl CompileError {
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pub fn new_spanned(span: &Span, msg: String) -> Self {
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CompileError {
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span: Some(*span),
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msg,
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}
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}
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pub fn new(msg: String) -> Self {
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CompileError {
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span: None,
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msg,
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}
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}
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}
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impl ToTokens for CompileError {
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fn to_tokens(&self, dst: &mut TokenStream) {
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let msg = &self.msg;
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let span = self.span.unwrap_or_else(|| Span::call_site());
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(quote_spanned! { span=>
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compile_error!(#msg);
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}).to_tokens(dst);
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}
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}
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