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use crate::ResultExt;
use crate::{MacroError, Payload};
use proc_macro2::{Span, TokenStream};
use std::iter::FromIterator;
use std::ops::{Deref, DerefMut};
pub struct MultiMacroErrors(Vec<MacroError>);
impl MultiMacroErrors {
pub fn new() -> Self {
MultiMacroErrors(Vec::new())
}
pub fn is_empty(&self) -> bool {
self.0.is_empty()
}
pub fn add(&mut self, err: MacroError) {
self.0.push(err)
}
pub fn add_span_msg(&mut self, span: Span, msg: String) {
self.add(MacroError::new(span, msg))
}
pub fn into_compile_errors(self) -> TokenStream {
let errs = self.0.into_iter().flat_map(MacroError::into_compile_error);
TokenStream::from_iter(errs)
}
pub fn trigger(self) -> ! {
panic!(Payload(self))
}
pub fn trigger_on_error(self) {
if !self.is_empty() {
self.trigger()
}
}
}
impl<T> ResultExt for Result<T, MultiMacroErrors> {
type Ok = T;
fn unwrap_or_exit(self) -> T {
match self {
Ok(res) => res,
Err(e) => e.trigger(),
}
}
fn expect_or_exit(self, message: &str) -> T {
match self {
Ok(res) => res,
Err(mut e) => {
for MacroError { msg, .. } in e.0.iter_mut() {
*msg = format!("{}: {}", message, msg);
}
e.trigger()
}
}
}
}
impl From<MultiMacroErrors> for TokenStream {
fn from(errors: MultiMacroErrors) -> Self {
errors.into_compile_errors()
}
}
impl From<MultiMacroErrors> for proc_macro::TokenStream {
fn from(errors: MultiMacroErrors) -> Self {
errors.into_compile_errors().into()
}
}
impl FromIterator<MacroError> for MultiMacroErrors {
fn from_iter<I>(iter: I) -> Self
where
I: IntoIterator<Item = MacroError>,
{
MultiMacroErrors(Vec::from_iter(iter))
}
}
impl IntoIterator for MultiMacroErrors {
type Item = MacroError;
type IntoIter = <Vec<MacroError> as IntoIterator>::IntoIter;
fn into_iter(self) -> Self::IntoIter {
self.0.into_iter()
}
}
impl Deref for MultiMacroErrors {
type Target = [MacroError];
fn deref(&self) -> &[MacroError] {
&self.0
}
}
impl DerefMut for MultiMacroErrors {
fn deref_mut(&mut self) -> &mut [MacroError] {
&mut self.0
}
}