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shell.rs
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140 lines (125 loc) · 4.32 KB
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mod helper;
use rustpython_parser::error::{LexicalErrorType, ParseErrorType};
use rustpython_vm::readline::{Readline, ReadlineResult};
use rustpython_vm::{
builtins::PyBaseExceptionRef,
compile::{self, CompileError, CompileErrorType},
scope::Scope,
AsObject, PyResult, VirtualMachine,
};
enum ShellExecResult {
Ok,
PyErr(PyBaseExceptionRef),
Continue,
}
fn shell_exec(vm: &VirtualMachine, source: &str, scope: Scope) -> ShellExecResult {
match vm.compile(source, compile::Mode::Single, "<stdin>".to_owned()) {
Ok(code) => match vm.run_code_obj(code, scope) {
Ok(_val) => ShellExecResult::Ok,
Err(err) => ShellExecResult::PyErr(err),
},
Err(CompileError {
error: CompileErrorType::Parse(ParseErrorType::Lexical(LexicalErrorType::Eof)),
..
})
| Err(CompileError {
error: CompileErrorType::Parse(ParseErrorType::Eof),
..
}) => ShellExecResult::Continue,
Err(err) => ShellExecResult::PyErr(vm.new_syntax_error(&err)),
}
}
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
.clone()
.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 stop_continuing = line.is_empty();
if full_input.is_empty() {
full_input = line;
} else {
full_input.push_str(&line);
}
full_input.push('\n');
if continuing {
if stop_continuing {
continuing = false;
} else {
continue;
}
}
match shell_exec(vm, &full_input, scope.clone()) {
ShellExecResult::Ok => {
full_input.clear();
Ok(())
}
ShellExecResult::Continue => {
continuing = true;
Ok(())
}
ShellExecResult::PyErr(err) => {
full_input.clear();
Err(err)
}
}
}
ReadlineResult::Interrupt => {
continuing = false;
full_input.clear();
let keyboard_interrupt =
vm.new_exception_empty(vm.ctx.exceptions.keyboard_interrupt.clone());
Err(keyboard_interrupt)
}
ReadlineResult::Eof => {
break;
}
ReadlineResult::EncodingError => {
eprintln!("Invalid UTF-8 entered");
Ok(())
}
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(())
}