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shell.rs
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153 lines (136 loc) · 4.69 KB
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mod readline;
#[cfg(not(target_os = "wasi"))]
mod rustyline_helper;
use rustpython_compiler::{compile, error::CompileError, error::CompileErrorType};
use rustpython_parser::error::ParseErrorType;
use rustpython_vm::{
exceptions::{print_exception, PyBaseExceptionRef},
obj::objtype,
pyobject::{ItemProtocol, PyResult},
scope::Scope,
VirtualMachine,
};
use readline::{Readline, ReadlineResult};
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_string()) {
Ok(code) => {
match vm.run_code_obj(code, scope.clone()) {
Ok(value) => {
// Save non-None values as "_"
if !vm.is_none(&value) {
let key = "_";
scope.globals.set_item(key, value, vm).unwrap();
}
ShellExecResult::Ok
}
Err(err) => ShellExecResult::PyErr(err),
}
}
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<()> {
println!(
"Welcome to the magnificent Rust Python {} interpreter \u{1f631} \u{1f596}",
crate_version!()
);
let mut repl = Readline::new(vm, scope.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
.get_attribute(vm.sys_module.clone(), prompt_name)
.and_then(|prompt| vm.to_str(&prompt));
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_str("\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 objtype::isinstance(&exc, &vm.ctx.exceptions.system_exit) {
repl.save_history(&repl_history_path).unwrap();
return Err(exc);
}
print_exception(vm, &exc);
}
}
repl.save_history(&repl_history_path).unwrap();
Ok(())
}