#![feature(rustc_private, bool_to_option)]
#![feature(crate_visibility_modifier)]
use rustc_ast::ast;
use rustc_ast::token::{self, Nonterminal};
use rustc_ast::tokenstream::{self, TokenStream, TokenTree};
use rustc_ast_pretty::pprust;
use rustc_data_structures::sync::Lrc;
use rustc_errors::{Diagnostic, FatalError, Level, PResult};
use rustc_session::parse::ParseSess;
use rustc_span::{FileName, SourceFile, Span};
use std::path::{Path, PathBuf};
use std::str;
use log::info;
pub const MACRO_ARGUMENTS: Option<&'static str> = Some("macro arguments");
#[macro_use]
pub mod parser;
use parser::{emit_unclosed_delims, make_unclosed_delims_error, Parser};
pub mod lexer;
pub mod validate_attr;
#[macro_use]
pub mod config;
#[derive(Clone)]
pub struct Directory {
pub path: PathBuf,
pub ownership: DirectoryOwnership,
}
#[derive(Copy, Clone)]
pub enum DirectoryOwnership {
Owned {
relative: Option<ast::Ident>,
},
UnownedViaBlock,
UnownedViaMod,
}
macro_rules! panictry_buffer {
($handler:expr, $e:expr) => {{
use rustc_errors::FatalError;
use std::result::Result::{Err, Ok};
match $e {
Ok(e) => e,
Err(errs) => {
for e in errs {
$handler.emit_diagnostic(&e);
}
FatalError.raise()
}
}
}};
}
pub fn parse_crate_from_file<'a>(input: &Path, sess: &'a ParseSess) -> PResult<'a, ast::Crate> {
let mut parser = new_parser_from_file(sess, input);
parser.parse_crate_mod()
}
pub fn parse_crate_attrs_from_file<'a>(
input: &Path,
sess: &'a ParseSess,
) -> PResult<'a, Vec<ast::Attribute>> {
let mut parser = new_parser_from_file(sess, input);
parser.parse_inner_attributes()
}
pub fn parse_crate_from_source_str(
name: FileName,
source: String,
sess: &ParseSess,
) -> PResult<'_, ast::Crate> {
new_parser_from_source_str(sess, name, source).parse_crate_mod()
}
pub fn parse_crate_attrs_from_source_str(
name: FileName,
source: String,
sess: &ParseSess,
) -> PResult<'_, Vec<ast::Attribute>> {
new_parser_from_source_str(sess, name, source).parse_inner_attributes()
}
pub fn parse_stream_from_source_str(
name: FileName,
source: String,
sess: &ParseSess,
override_span: Option<Span>,
) -> TokenStream {
let (stream, mut errors) =
source_file_to_stream(sess, sess.source_map().new_source_file(name, source), override_span);
emit_unclosed_delims(&mut errors, &sess);
stream
}
pub fn new_parser_from_source_str(sess: &ParseSess, name: FileName, source: String) -> Parser<'_> {
panictry_buffer!(&sess.span_diagnostic, maybe_new_parser_from_source_str(sess, name, source))
}
pub fn maybe_new_parser_from_source_str(
sess: &ParseSess,
name: FileName,
source: String,
) -> Result<Parser<'_>, Vec<Diagnostic>> {
let mut parser =
maybe_source_file_to_parser(sess, sess.source_map().new_source_file(name, source))?;
parser.recurse_into_file_modules = false;
Ok(parser)
}
pub fn new_parser_from_file<'a>(sess: &'a ParseSess, path: &Path) -> Parser<'a> {
source_file_to_parser(sess, file_to_source_file(sess, path, None))
}
pub fn maybe_new_parser_from_file<'a>(
sess: &'a ParseSess,
path: &Path,
) -> Result<Parser<'a>, Vec<Diagnostic>> {
let file = try_file_to_source_file(sess, path, None).map_err(|db| vec![db])?;
maybe_source_file_to_parser(sess, file)
}
pub fn new_sub_parser_from_file<'a>(
sess: &'a ParseSess,
path: &Path,
directory_ownership: DirectoryOwnership,
module_name: Option<String>,
sp: Span,
) -> Parser<'a> {
let mut p = source_file_to_parser(sess, file_to_source_file(sess, path, Some(sp)));
p.directory.ownership = directory_ownership;
p.root_module_name = module_name;
p
}
fn source_file_to_parser(sess: &ParseSess, source_file: Lrc<SourceFile>) -> Parser<'_> {
panictry_buffer!(&sess.span_diagnostic, maybe_source_file_to_parser(sess, source_file))
}
fn maybe_source_file_to_parser(
sess: &ParseSess,
source_file: Lrc<SourceFile>,
) -> Result<Parser<'_>, Vec<Diagnostic>> {
let end_pos = source_file.end_pos;
let (stream, unclosed_delims) = maybe_file_to_stream(sess, source_file, None)?;
let mut parser = stream_to_parser(sess, stream, None);
parser.unclosed_delims = unclosed_delims;
if parser.token == token::Eof {
parser.token.span = Span::new(end_pos, end_pos, parser.token.span.ctxt());
}
Ok(parser)
}
pub fn new_parser_from_tts(sess: &ParseSess, tts: Vec<TokenTree>) -> Parser<'_> {
stream_to_parser(sess, tts.into_iter().collect(), crate::MACRO_ARGUMENTS)
}
fn try_file_to_source_file(
sess: &ParseSess,
path: &Path,
spanopt: Option<Span>,
) -> Result<Lrc<SourceFile>, Diagnostic> {
sess.source_map().load_file(path).map_err(|e| {
let msg = format!("couldn't read {}: {}", path.display(), e);
let mut diag = Diagnostic::new(Level::Fatal, &msg);
if let Some(sp) = spanopt {
diag.set_span(sp);
}
diag
})
}
fn file_to_source_file(sess: &ParseSess, path: &Path, spanopt: Option<Span>) -> Lrc<SourceFile> {
match try_file_to_source_file(sess, path, spanopt) {
Ok(source_file) => source_file,
Err(d) => {
sess.span_diagnostic.emit_diagnostic(&d);
FatalError.raise();
}
}
}
pub fn source_file_to_stream(
sess: &ParseSess,
source_file: Lrc<SourceFile>,
override_span: Option<Span>,
) -> (TokenStream, Vec<lexer::UnmatchedBrace>) {
panictry_buffer!(&sess.span_diagnostic, maybe_file_to_stream(sess, source_file, override_span))
}
pub fn maybe_file_to_stream(
sess: &ParseSess,
source_file: Lrc<SourceFile>,
override_span: Option<Span>,
) -> Result<(TokenStream, Vec<lexer::UnmatchedBrace>), Vec<Diagnostic>> {
let srdr = lexer::StringReader::new(sess, source_file, override_span);
let (token_trees, unmatched_braces) = srdr.into_token_trees();
match token_trees {
Ok(stream) => Ok((stream, unmatched_braces)),
Err(err) => {
let mut buffer = Vec::with_capacity(1);
err.buffer(&mut buffer);
for unmatched in unmatched_braces {
if let Some(err) = make_unclosed_delims_error(unmatched, &sess) {
err.buffer(&mut buffer);
}
}
Err(buffer)
}
}
}
pub fn stream_to_parser<'a>(
sess: &'a ParseSess,
stream: TokenStream,
subparser_name: Option<&'static str>,
) -> Parser<'a> {
Parser::new(sess, stream, None, true, false, subparser_name)
}
pub fn stream_to_parser_with_base_dir<'a>(
sess: &'a ParseSess,
stream: TokenStream,
base_dir: Directory,
) -> Parser<'a> {
Parser::new(sess, stream, Some(base_dir), true, false, None)
}
pub fn parse_in<'a, T>(
sess: &'a ParseSess,
tts: TokenStream,
name: &'static str,
mut f: impl FnMut(&mut Parser<'a>) -> PResult<'a, T>,
) -> PResult<'a, T> {
let mut parser = Parser::new(sess, tts, None, false, false, Some(name));
let result = f(&mut parser)?;
if parser.token != token::Eof {
parser.unexpected()?;
}
Ok(result)
}
pub fn nt_to_tokenstream(nt: &Nonterminal, sess: &ParseSess, span: Span) -> TokenStream {
let tokens = match *nt {
Nonterminal::NtItem(ref item) => {
prepend_attrs(sess, &item.attrs, item.tokens.as_ref(), span)
}
Nonterminal::NtIdent(ident, is_raw) => {
Some(tokenstream::TokenTree::token(token::Ident(ident.name, is_raw), ident.span).into())
}
Nonterminal::NtLifetime(ident) => {
Some(tokenstream::TokenTree::token(token::Lifetime(ident.name), ident.span).into())
}
Nonterminal::NtTT(ref tt) => Some(tt.clone().into()),
_ => None,
};
let source = pprust::nonterminal_to_string(nt);
let filename = FileName::macro_expansion_source_code(&source);
let tokens_for_real = parse_stream_from_source_str(filename, source, sess, Some(span));
if let Some(tokens) = tokens {
if tokens.probably_equal_for_proc_macro(&tokens_for_real) {
return tokens;
}
info!(
"cached tokens found, but they're not \"probably equal\", \
going with stringified version"
);
}
return tokens_for_real;
}
fn prepend_attrs(
sess: &ParseSess,
attrs: &[ast::Attribute],
tokens: Option<&tokenstream::TokenStream>,
span: rustc_span::Span,
) -> Option<tokenstream::TokenStream> {
let tokens = tokens?;
if attrs.is_empty() {
return Some(tokens.clone());
}
let mut builder = tokenstream::TokenStreamBuilder::new();
for attr in attrs {
assert_eq!(
attr.style,
ast::AttrStyle::Outer,
"inner attributes should prevent cached tokens from existing"
);
let source = pprust::attribute_to_string(attr);
let macro_filename = FileName::macro_expansion_source_code(&source);
let item = match attr.kind {
ast::AttrKind::Normal(ref item) => item,
ast::AttrKind::DocComment(_) => {
let stream = parse_stream_from_source_str(macro_filename, source, sess, Some(span));
builder.push(stream);
continue;
}
};
let mut brackets = tokenstream::TokenStreamBuilder::new();
if item.path.segments.len() == 1 && item.path.segments[0].args.is_none() {
let ident = item.path.segments[0].ident;
let token = token::Ident(ident.name, ident.as_str().starts_with("r#"));
brackets.push(tokenstream::TokenTree::token(token, ident.span));
} else {
let stream = parse_stream_from_source_str(macro_filename, source, sess, Some(span));
brackets.push(stream);
}
brackets.push(item.args.outer_tokens());
builder.push(tokenstream::TokenTree::token(token::Pound, attr.span));
let delim_span = tokenstream::DelimSpan::from_single(attr.span);
builder.push(tokenstream::TokenTree::Delimited(
delim_span,
token::DelimToken::Bracket,
brackets.build(),
));
}
builder.push(tokens.clone());
Some(builder.build())
}