1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
use std::panic::{catch_unwind, AssertUnwindSafe};
use std::path::{Path, PathBuf};
use rustc_ast::token::TokenKind;
use rustc_ast::{ast, ptr};
use rustc_errors::Diagnostic;
use rustc_parse::{new_parser_from_file, parser::Parser as RawParser};
use rustc_span::{sym, Span};
use crate::attr::first_attr_value_str_by_name;
use crate::parse::session::ParseSess;
use crate::Input;
pub(crate) type DirectoryOwnership = rustc_expand::module::DirOwnership;
pub(crate) type ModulePathSuccess = rustc_expand::module::ModulePathSuccess;
pub(crate) type ModError<'a> = rustc_expand::module::ModError<'a>;
#[derive(Clone)]
pub(crate) struct Directory {
pub(crate) path: PathBuf,
pub(crate) ownership: DirectoryOwnership,
}
/// A parser for Rust source code.
pub(crate) struct Parser<'a> {
parser: RawParser<'a>,
}
/// A builder for the `Parser`.
#[derive(Default)]
pub(crate) struct ParserBuilder<'a> {
sess: Option<&'a ParseSess>,
input: Option<Input>,
}
impl<'a> ParserBuilder<'a> {
pub(crate) fn input(mut self, input: Input) -> ParserBuilder<'a> {
self.input = Some(input);
self
}
pub(crate) fn sess(mut self, sess: &'a ParseSess) -> ParserBuilder<'a> {
self.sess = Some(sess);
self
}
pub(crate) fn build(self) -> Result<Parser<'a>, ParserError> {
let sess = self.sess.ok_or(ParserError::NoParseSess)?;
let input = self.input.ok_or(ParserError::NoInput)?;
let parser = match Self::parser(sess.inner(), input) {
Ok(p) => p,
Err(db) => {
if let Some(diagnostics) = db {
sess.emit_diagnostics(diagnostics);
return Err(ParserError::ParserCreationError);
}
return Err(ParserError::ParsePanicError);
}
};
Ok(Parser { parser })
}
fn parser(
sess: &'a rustc_session::parse::ParseSess,
input: Input,
) -> Result<rustc_parse::parser::Parser<'a>, Option<Vec<Diagnostic>>> {
match input {
Input::File(ref file) => catch_unwind(AssertUnwindSafe(move || {
new_parser_from_file(sess, file, None)
}))
.map_err(|_| None),
Input::Text(text) => rustc_parse::maybe_new_parser_from_source_str(
sess,
rustc_span::FileName::Custom("stdin".to_owned()),
text,
)
.map_err(Some),
}
}
}
#[derive(Debug, PartialEq)]
pub(crate) enum ParserError {
NoParseSess,
NoInput,
ParserCreationError,
ParseError,
ParsePanicError,
}
impl<'a> Parser<'a> {
pub(crate) fn submod_path_from_attr(attrs: &[ast::Attribute], path: &Path) -> Option<PathBuf> {
let path_sym = first_attr_value_str_by_name(attrs, sym::path)?;
let path_str = path_sym.as_str();
// On windows, the base path might have the form
// `\\?\foo\bar` in which case it does not tolerate
// mixed `/` and `\` separators, so canonicalize
// `/` to `\`.
#[cfg(windows)]
let path_str = path_str.replace("/", "\\");
Some(path.join(path_str))
}
pub(crate) fn parse_file_as_module(
sess: &'a ParseSess,
path: &Path,
span: Span,
) -> Result<(ast::AttrVec, Vec<ptr::P<ast::Item>>, Span), ParserError> {
let result = catch_unwind(AssertUnwindSafe(|| {
let mut parser = new_parser_from_file(sess.inner(), path, Some(span));
match parser.parse_mod(&TokenKind::Eof) {
Ok((a, i, spans)) => Some((a, i, spans.inner_span)),
Err(mut e) => {
e.emit();
if sess.can_reset_errors() {
sess.reset_errors();
}
None
}
}
}));
match result {
Ok(Some(m)) if !sess.has_errors() => Ok(m),
Ok(Some(m)) if sess.can_reset_errors() => {
sess.reset_errors();
Ok(m)
}
Ok(_) => Err(ParserError::ParseError),
Err(..) if path.exists() => Err(ParserError::ParseError),
Err(_) => Err(ParserError::ParsePanicError),
}
}
pub(crate) fn parse_crate(
input: Input,
sess: &'a ParseSess,
) -> Result<ast::Crate, ParserError> {
let krate = Parser::parse_crate_inner(input, sess)?;
if !sess.has_errors() {
return Ok(krate);
}
if sess.can_reset_errors() {
sess.reset_errors();
return Ok(krate);
}
Err(ParserError::ParseError)
}
fn parse_crate_inner(input: Input, sess: &'a ParseSess) -> Result<ast::Crate, ParserError> {
ParserBuilder::default()
.input(input)
.sess(sess)
.build()?
.parse_crate_mod()
}
fn parse_crate_mod(&mut self) -> Result<ast::Crate, ParserError> {
let mut parser = AssertUnwindSafe(&mut self.parser);
match catch_unwind(move || parser.parse_crate_mod()) {
Ok(Ok(k)) => Ok(k),
Ok(Err(mut db)) => {
db.emit();
Err(ParserError::ParseError)
}
Err(_) => Err(ParserError::ParsePanicError),
}
}
}
|
