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#[macro_use]
extern crate clap;
extern crate env_logger;
#[macro_use]
extern crate log;
extern crate rustpython_parser;
extern crate rustpython_vm;
extern crate rustyline;
use clap::{App, Arg};
use rustpython_parser::error::ParseError;
use rustpython_vm::{
compile,
error::CompileError,
frame::ScopeRef,
import,
obj::objstr,
print_exception,
pyobject::{AttributeProtocol, PyResult},
util, VirtualMachine,
};
use rustyline::{error::ReadlineError, Editor};
use std::path::{Path, PathBuf};
fn main() {
env_logger::init();
let matches = App::new("RustPython")
.version(crate_version!())
.author(crate_authors!())
.about("Rust implementation of the Python language")
.arg(Arg::with_name("script").required(false).index(1))
.arg(
Arg::with_name("v")
.short("v")
.multiple(true)
.help("Give the verbosity"),
)
.arg(
Arg::with_name("c")
.short("c")
.takes_value(true)
.help("run the given string as a program"),
)
.arg(
Arg::with_name("m")
.short("m")
.takes_value(true)
.help("run library module as script"),
)
.arg(Arg::from_usage("[pyargs] 'args for python'").multiple(true))
.get_matches();
// Construct vm:
let mut vm = VirtualMachine::new();
// Figure out if a -c option was given:
let result = if let Some(command) = matches.value_of("c") {
run_command(&mut vm, command.to_string())
} else if let Some(module) = matches.value_of("m") {
run_module(&mut vm, module)
} else {
// Figure out if a script was passed:
match matches.value_of("script") {
None => run_shell(&mut vm),
Some(filename) => run_script(&mut vm, filename),
}
};
// See if any exception leaked out:
handle_exception(&mut vm, result);
}
fn _run_string(vm: &mut VirtualMachine, source: &str, source_path: String) -> PyResult {
let code_obj = compile::compile(
source,
&compile::Mode::Exec,
source_path,
vm.ctx.code_type(),
)
.map_err(|err| {
let syntax_error = vm.context().exceptions.syntax_error.clone();
vm.new_exception(syntax_error, err.to_string())
})?;
// trace!("Code object: {:?}", code_obj.borrow());
let builtins = vm.get_builtin_scope();
let vars = vm.context().new_scope(Some(builtins)); // Keep track of local variables
vm.run_code_obj(code_obj, vars)
}
fn handle_exception(vm: &mut VirtualMachine, result: PyResult) {
if let Err(err) = result {
print_exception(vm, &err);
std::process::exit(1);
}
}
fn run_command(vm: &mut VirtualMachine, mut source: String) -> PyResult {
debug!("Running command {}", source);
// This works around https://github.com/RustPython/RustPython/issues/17
source.push('\n');
_run_string(vm, &source, "<stdin>".to_string())
}
fn run_module(vm: &mut VirtualMachine, module: &str) -> PyResult {
debug!("Running module {}", module);
let current_path = PathBuf::from(".");
import::import_module(vm, current_path, module)
}
fn run_script(vm: &mut VirtualMachine, script_file: &str) -> PyResult {
debug!("Running file {}", script_file);
// Parse an ast from it:
let file_path = Path::new(script_file);
match util::read_file(file_path) {
Ok(source) => _run_string(vm, &source, file_path.to_str().unwrap().to_string()),
Err(err) => {
error!("Failed reading file: {:?}", err.kind());
std::process::exit(1);
}
}
}
fn shell_exec(vm: &mut VirtualMachine, source: &str, scope: ScopeRef) -> Result<(), CompileError> {
match compile::compile(
source,
&compile::Mode::Single,
"<stdin>".to_string(),
vm.ctx.code_type(),
) {
Ok(code) => {
if let Err(err) = vm.run_code_obj(code, scope) {
print_exception(vm, &err);
}
Ok(())
}
// Don't inject syntax errors for line continuation
Err(err @ CompileError::Parse(ParseError::EOF(_))) => Err(err),
Err(err) => {
let syntax_error = vm.context().exceptions.syntax_error.clone();
let exc = vm.new_exception(syntax_error, format!("{}", err));
print_exception(vm, &exc);
Err(err)
}
}
}
#[cfg(not(unix))]
fn get_history_path() -> PathBuf {
PathBuf::from(".repl_history.txt")
}
#[cfg(unix)]
fn get_history_path() -> PathBuf {
//work around for windows dependent builds. The xdg crate is unix specific
//so access to the BaseDirectories struct breaks builds on python.
extern crate xdg;
let xdg_dirs = xdg::BaseDirectories::with_prefix("rustpython").unwrap();
xdg_dirs.place_cache_file("repl_history.txt").unwrap()
}
fn run_shell(vm: &mut VirtualMachine) -> PyResult {
println!(
"Welcome to the magnificent Rust Python {} interpreter",
crate_version!()
);
let builtins = vm.get_builtin_scope();
let vars = vm.context().new_scope(Some(builtins)); // Keep track of local variables
// Read a single line:
let mut input = String::new();
let mut repl = Editor::<()>::new();
// Retrieve a `history_path_str` dependent on the OS
let repl_history_path_str = &get_history_path();
if repl.load_history(repl_history_path_str).is_err() {
println!("No previous history.");
}
let ps1 = &objstr::get_value(&vm.sys_module.get_attr("ps1").unwrap());
let ps2 = &objstr::get_value(&vm.sys_module.get_attr("ps2").unwrap());
let mut prompt = ps1;
loop {
match repl.readline(prompt) {
Ok(line) => {
debug!("You entered {:?}", line);
input.push_str(&line);
input.push_str("\n");
repl.add_history_entry(line.trim_end().as_ref());
match shell_exec(vm, &input, vars.clone()) {
4864
Err(CompileError::Parse(ParseError::EOF(_))) => {
prompt = ps2;
continue;
}
_ => {
prompt = ps1;
input = String::new();
}
}
}
Err(ReadlineError::Interrupted) => {
// TODO: Raise a real KeyboardInterrupt exception
println!("^C");
break;
}
Err(ReadlineError::Eof) => {
break;
}
Err(err) => {
println!("Error: {:?}", err);
break;
}
};
}
repl.save_history(repl_history_path_str).unwrap();
Ok(vm.get_none())
}