forked from RustPython/RustPython
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathshell.rs
More file actions
183 lines (167 loc) · 6.22 KB
/
shell.rs
File metadata and controls
183 lines (167 loc) · 6.22 KB
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
176
177
178
179
180
181
182
183
mod helper;
use rustpython_parser::{ParseErrorType, Tok, lexer::LexicalErrorType};
use rustpython_vm::{
AsObject, PyResult, VirtualMachine,
builtins::PyBaseExceptionRef,
compiler::{self, CompileError, CompileErrorType},
readline::{Readline, ReadlineResult},
scope::Scope,
};
enum ShellExecResult {
Ok,
PyErr(PyBaseExceptionRef),
Continue,
}
fn shell_exec(
vm: &VirtualMachine,
source: &str,
scope: Scope,
empty_line_given: bool,
continuing: bool,
) -> ShellExecResult {
match vm.compile(source, compiler::Mode::Single, "<stdin>".to_owned()) {
Ok(code) => {
if empty_line_given || !continuing {
// We want to execute the full code
match vm.run_code_obj(code, scope) {
Ok(_val) => ShellExecResult::Ok,
Err(err) => ShellExecResult::PyErr(err),
}
} else {
// We can just return an ok result
ShellExecResult::Ok
}
}
Err(CompileError {
error: CompileErrorType::Parse(ParseErrorType::Lexical(LexicalErrorType::Eof)),
..
})
| Err(CompileError {
error: CompileErrorType::Parse(ParseErrorType::Eof),
..
}) => ShellExecResult::Continue,
Err(err) => {
// bad_error == true if we are handling an error that should be thrown even if we are continuing
// if its an indentation error, set to true if we are continuing and the error is on column 0,
// since indentations errors on columns other than 0 should be ignored.
// if its an unrecognized token for dedent, set to false
let bad_error = match err.error {
CompileErrorType::Parse(ref p) => {
if matches!(
p,
ParseErrorType::Lexical(LexicalErrorType::IndentationError)
) {
continuing && err.location.is_some()
} else {
!matches!(p, ParseErrorType::UnrecognizedToken(Tok::Dedent, _))
}
}
_ => true, // It is a bad error for everything else
};
// If we are handling an error on an empty line or an error worthy of throwing
if empty_line_given || bad_error {
ShellExecResult::PyErr(vm.new_syntax_error(&err, Some(source)))
} else {
ShellExecResult::Continue
}
}
}
}
pub fn run_shell(vm: &VirtualMachine, scope: Scope) -> PyResult<()> {
let mut repl = Readline::new(helper::ShellHelper::new(vm, scope.globals.clone()));
let mut full_input = String::new();
// Retrieve a `history_path_str` dependent on the OS
let repl_history_path = match dirs::config_dir() {
Some(mut path) => {
path.push("rustpython");
path.push("repl_history.txt");
path
}
None => ".repl_history.txt".into(),
};
if repl.load_history(&repl_history_path).is_err() {
println!("No previous history.");
}
let mut continuing = false;
loop {
let prompt_name = if continuing { "ps2" } else { "ps1" };
let prompt = vm
.sys_module
.get_attr(prompt_name, vm)
.and_then(|prompt| prompt.str(vm));
let prompt = match prompt {
Ok(ref s) => s.as_str(),
Err(_) => "",
};
let result = match repl.readline(prompt) {
ReadlineResult::Line(line) => {
debug!("You entered {:?}", line);
repl.add_history_entry(line.trim_end()).unwrap();
let empty_line_given = line.is_empty();
if full_input.is_empty() {
full_input = line;
} else {
full_input.push_str(&line);
}
full_input.push('\n');
match shell_exec(vm, &full_input, scope.clone(), empty_line_given, continuing) {
ShellExecResult::Ok => {
if continuing {
if empty_line_given {
// We should be exiting continue mode
continuing = false;
full_input.clear();
Ok(())
} else {
// We should stay in continue mode
continuing = true;
Ok(())
}
} else {
// We aren't in continue mode so proceed normally
continuing = false;
full_input.clear();
Ok(())
}
}
ShellExecResult::Continue => {
continuing = true;
Ok(())
}
ShellExecResult::PyErr(err) => {
continuing = false;
full_input.clear();
Err(err)
}
}
}
ReadlineResult::Interrupt => {
continuing = false;
full_input.clear();
let keyboard_interrupt =
vm.new_exception_empty(vm.ctx.exceptions.keyboard_interrupt.to_owned());
Err(keyboard_interrupt)
}
ReadlineResult::Eof => {
break;
}
ReadlineResult::Other(err) => {
eprintln!("Readline error: {err:?}");
break;
}
ReadlineResult::Io(err) => {
eprintln!("IO error: {err:?}");
break;
}
};
if let Err(exc) = result {
if exc.fast_isinstance(vm.ctx.exceptions.system_exit) {
repl.save_history(&repl_history_path).unwrap();
return Err(exc);
}
vm.print_exception(exc);
}
}
repl.save_history(&repl_history_path).unwrap();
Ok(())
}