RustPython/src/shell.rs at main · coolcoder613eb/RustPython · GitHub

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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!(

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(())

}

RustPython/src/shell.rs at main · coolcoder613eb/RustPython · GitHub

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