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use std::{
fmt::{self, Debug, Display},
ops::Range,
};
use codespan_reporting::{
diagnostic::{Diagnostic, Label},
files::{Files, SimpleFile},
term,
};
use proc_macro2::{LineColumn, Span};
mod c_lang;
mod codegen;
mod typecheck;
pub struct Session {
files: SimpleFile<String, String>,
}
impl Session {
pub fn new(file_name: String, source: String) -> Self {
Self {
files: SimpleFile::new(file_name, source),
}
}
#[cfg(feature = "dev")]
pub fn debug(&self) -> Result<String, Box<dyn std::error::Error>> {
Ok(format!("{:#?}", syn::parse_file(&self.files.source())?))
}
pub fn compile(&self) -> Result<impl Display, SessionError> {
let syn_file = syn::parse_file(self.files.source()).map_err(|e| {
let error = CompilationError {
msg: format!("{}", e),
span: e.span(),
};
SessionError {
errors: vec![error],
syntax: true,
files: &self.files,
}
})?;
let type_info = typecheck::check(&syn_file).map_err(|e| SessionError {
errors: e.errors,
files: &self.files,
syntax: false,
})?;
match codegen::transform(&syn_file, type_info) {
Ok(program) => Ok(program),
Err(e) => Err(SessionError {
errors: e.errors,
syntax: false,
files: &self.files,
}),
}
}
}
pub struct SessionError<'a> {
pub syntax: bool,
pub errors: Vec<CompilationError>,
files: &'a SimpleFile<String, String>,
}
impl<'a> SessionError<'a> {
pub fn report(self) -> ! {
let mut writer =
term::termcolor::StandardStream::stderr(term::termcolor::ColorChoice::Auto);
self.report_to_writer(&mut writer);
std::process::exit(1);
}
pub fn into_ansi(mut self) -> Vec<(String, Span)> {
let errors = {
let mut errors = vec![];
std::mem::swap(&mut errors, &mut self.errors);
errors
};
errors
.into_iter()
.map(|error| (error.span, self.map_err(error)))
.map(|(span, diagnostic)| {
let mut buffer = term::termcolor::Buffer::ansi();
term::emit(
&mut buffer,
&term::Config::default(),
self.files,
&diagnostic,
)
.unwrap();
(String::from_utf8(buffer.into_inner()).unwrap(), span)
})
.collect()
}
fn report_to_writer(
mut self,
writer: &mut dyn codespan_reporting::term::termcolor::WriteColor,
) {
let n_of_errors = self.errors.len();
let errors = {
let mut errors = vec![];
std::mem::swap(&mut errors, &mut self.errors);
errors
};
for diagnostic in errors.into_iter().map(|err| self.map_err(err)) {
term::emit(writer, &term::Config::default(), self.files, &diagnostic).unwrap()
}
write!(writer, "Compilation failed due to {} errors", n_of_errors).unwrap();
}
fn map_err(&self, error: CompilationError) -> Diagnostic<()> {
Diagnostic::error()
.with_message(error.msg)
.with_labels(vec![Label::primary((), self.span_to_range(error.span))])
}
fn span_to_range(&self, span: Span) -> Range<usize> {
self.linecolumn_to_index(span.start())..self.linecolumn_to_index(span.end())
}
fn linecolumn_to_index(&self, linecol: LineColumn) -> usize {
let range = self.files.line_range((), linecol.line - 1).unwrap();
range.start + linecol.column
}
}
impl<'a> Display for SessionError<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
std::writeln!(f, "Failed due to {} errors", self.errors.len())
}
}
impl<'a> Debug for SessionError<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
Display::fmt(self, f)
}
}
impl<'a> std::error::Error for SessionError<'a> {}
#[derive(Debug)]
pub struct CompilationError {
pub span: Span,
pub msg: String,
}
#[derive(Debug)]
struct CompilationErrors {
errors: Vec<CompilationError>,
}
impl Display for CompilationErrors {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
for error in &self.errors {
writeln!(f, "Error: {} ({:?})", error.msg, error.span)?;
}
Ok(())
}
}
impl std::error::Error for CompilationErrors {}