GV

GeezerVison

The World Wide Web, restored to 800 pixels of glory.

Home|About|Gaming cabinet|Archives|How it works|Starter sites

On this site

  • Sign in
  • ActionsCI/CD and automation
  • CodespacesCloud development environments
  • All Features
  • Documentation
  • Training
  • Certifications
  • Build with Copilot
  • Customize Copilot
  • Integrations
  • Trending repos
  • GitHub Sponsors
  • Developer articles
  • Enterprises

This view

  • Original page
  • New address

GeezerVison is showing github.com — RustPython/src/shell.rs at stack/python-3.15-8950 · RustPython/RustPython

Expand file tree

/

shell.rs

Copy path
More file actions
More file actions

Latest commit

 

History

History
History
230 lines (213 loc) · 7.83 KB
/

shell.rs

Copy path

File metadata and controls

230 lines (213 loc) · 7.83 KB
Raw
Copy raw file
Download raw file
Open symbols panel
Edit and raw actions
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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
mod helper;
use rustpython_compiler::{
CompileError, ParseError, parser::InterpolatedStringErrorType, parser::LexicalErrorType,
parser::ParseErrorType,
};
use rustpython_vm::{
AsObject, PyResult, VirtualMachine,
builtins::PyBaseExceptionRef,
bytecode::CodeFlags,
compiler::{self},
readline::{Readline, ReadlineResult},
scope::Scope,
vm::VmCompileError,
};
enum ShellExecResult {
Ok,
PyErr(PyBaseExceptionRef),
ContinueBlock,
ContinueLine,
}
fn shell_exec(
vm: &VirtualMachine,
source: &str,
scope: Scope,
empty_line_given: bool,
continuing_block: bool,
future_features: &mut CodeFlags,
) -> ShellExecResult {
// compiling expects only UNIX style line endings, and will replace windows line endings
// internally. Since we might need to analyze the source to determine if an error could be
// resolved by future input, we need the location from the error to match the source code that
// was actually compiled.
#[cfg(windows)]
let source = &source.replace("\r\n", "\n");
let opts = compiler::CompileOpts {
future_features: *future_features,
..vm.compile_opts()
};
match vm.compile_with_opts(source, compiler::Mode::Single, "<stdin>", opts) {
Ok(code) => {
*future_features |= code.code.flags & CodeFlags::FUTURE_MASK;
let _ = vm.register_code_in_linecache(&code, source);
if empty_line_given || !continuing_block {
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(err) => {
if matches!(
&err,
VmCompileError::Compile(CompileError::Parse(ParseError {
error: ParseErrorType::Lexical(
LexicalErrorType::Eof
| LexicalErrorType::FStringError(
InterpolatedStringErrorType::UnterminatedTripleQuotedString { .. },
)
| LexicalErrorType::UnclosedStringError {
triple_quoted: true,
..
}
),
..
}))
) {
return ShellExecResult::ContinueLine;
}
// An unfinished suite is _IncompleteInputError, not IndentationError.
let exc = err.into_pyexception_maybe_incomplete(vm, Some(source), !empty_line_given);
if !empty_line_given && exc.fast_isinstance(vm.ctx.exceptions.incomplete_input_error) {
ShellExecResult::ContinueBlock
} else {
ShellExecResult::PyErr(exc)
}
}
}
}
fn flush_stdio(vm: &VirtualMachine) {
for name in ["stdout", "stderr"] {
if let Ok(stream) = vm.sys_module.get_attr(name, vm) {
let _ = vm.call_method(&stream, "flush", ());
}
}
}
/// Enter a repl loop
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(),
};
let _ = repl.load_history(&repl_history_path);
// We might either be waiting to know if a block is complete, or waiting to know if a multiline
// statement is complete. In the former case, we need to ensure that we read one extra new line
// to know that the block is complete. In the latter, we can execute as soon as the statement is
// valid.
let mut continuing_block = false;
let mut continuing_line = false;
let mut future_features = CodeFlags::empty();
loop {
let prompt_name = if continuing_block || continuing_line {
"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.expect_str(),
Err(_) => "",
};
continuing_line = false;
let result = match repl.readline(prompt) {
ReadlineResult::Line(line) => {
#[cfg(debug_assertions)]
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_block,
&mut future_features,
) {
ShellExecResult::Ok => {
if continuing_block {
if empty_line_given {
// We should exit continue mode since the block successfully executed
continuing_block = false;
full_input.clear();
}
} else {
// We aren't in continue mode so proceed normally
full_input.clear();
}
Ok(())
}
// Continue, but don't change the mode
ShellExecResult::ContinueLine => {
continuing_line = true;
Ok(())
}
ShellExecResult::ContinueBlock => {
continuing_block = true;
Ok(())
}
ShellExecResult::PyErr(err) => {
continuing_block = false;
full_input.clear();
Err(err)
}
}
}
ReadlineResult::Interrupt => {
continuing_block = false;
full_input.clear();
let keyboard_interrupt =
vm.new_exception_empty(vm.ctx.exceptions.keyboard_interrupt.to_owned());
Err(keyboard_interrupt)
}
ReadlineResult::Eof => {
break;
}
#[cfg(unix)]
ReadlineResult::OsError(num) => {
let os_error = vm.new_exception_msg(
vm.ctx.exceptions.os_error.to_owned(),
format!("{num:?}").into(),
);
vm.print_exception(&os_error);
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) {
let _ = repl.save_history(&repl_history_path);
return Err(exc);
}
vm.print_exception(&exc);
}
flush_stdio(vm);
}
let _ = repl.save_history(&repl_history_path);
Ok(())
}
You are visitor 01402503 — GeezerVison does not store the pages you look up.
Best viewed with Netscape Navigator 4.7 or Internet Explorer 6 at 800×600. No cookies required.