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shell.rs
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mod helper;
use rustpython_parser::{lexer::LexicalErrorType, ParseErrorType, Tok};
use rustpython_vm::{
builtins::PyBaseExceptionRef,
compiler::{self, CompileError, CompileErrorType},
readline::{Readline, ReadlineResult},
scope::Scope,
version, AsObject, PyResult, VirtualMachine,
};
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;
println!(
"RustPython {}.{}.{}",
version::MAJOR,
version::MINOR,
version::MICRO,
);
println!("Type \"help\", \"copyright\", \"credits\" or \"license\" for more information.");
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(())
}