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denoland-deno/src/flags.rs

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// Copyright 2018 the Deno authors. All rights reserved. MIT license.
use libc::c_int;
use libdeno;
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use log;
use std::ffi::CStr;
use std::ffi::CString;
use std::mem;
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use std::process::exit;
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use std::vec::Vec;
// Creates vector of strings, Vec<String>
#[cfg(test)]
macro_rules! svec {
($($x:expr),*) => (vec![$($x.to_string()),*]);
}
#[derive(Debug, PartialEq, Default)]
pub struct DenoFlags {
pub help: bool,
pub log_debug: bool,
pub version: bool,
pub reload: bool,
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pub recompile: bool,
pub allow_write: bool,
pub allow_net: bool,
pub allow_env: bool,
pub deps_flag: bool,
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pub types_flag: bool,
}
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pub fn process(flags: &DenoFlags) {
if flags.help {
print_usage();
exit(0);
}
let mut log_level = log::LevelFilter::Info;
if flags.log_debug {
log_level = log::LevelFilter::Debug;
}
log::set_max_level(log_level);
}
pub fn print_usage() {
println!(
"Usage: deno script.ts
--allow-write Allow file system write access.
--allow-net Allow network access.
--allow-env Allow environment access.
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--recompile Force recompilation of TypeScript code.
-v or --version Print the version.
-r or --reload Reload cached remote resources.
-D or --log-debug Log debug output.
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-h or --help Print this message.
--v8-options Print V8 command line options.
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--deps Print module dependencies.
--types Print runtime TypeScript declarations.
Environment variables:
DENO_DIR Set deno's base directory."
);
}
// Parses flags for deno. This does not do v8_set_flags() - call that separately.
pub fn set_flags(
args: Vec<String>,
) -> Result<(DenoFlags, Vec<String>), String> {
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let args = v8_set_flags(args);
let mut flags = DenoFlags::default();
let mut rest = Vec::new();
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let mut arg_iter = args.iter();
while let Some(a) = arg_iter.next() {
if a.len() > 1 && &a[0..2] == "--" {
match a.as_str() {
"--help" => flags.help = true,
"--log-debug" => flags.log_debug = true,
"--version" => flags.version = true,
"--reload" => flags.reload = true,
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"--recompile" => flags.recompile = true,
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"--allow-write" => flags.allow_write = true,
"--allow-net" => flags.allow_net = true,
"--allow-env" => flags.allow_env = true,
"--deps" => flags.deps_flag = true,
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"--types" => flags.types_flag = true,
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"--" => break,
other => return Err(format!("bad option {}", other)),
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}
} else if a.len() > 1 && &a[0..1] == "-" {
let mut iter = a.chars().skip(1); // skip the "-"
while let Some(f) = iter.next() {
match f {
'h' => flags.help = true,
'D' => flags.log_debug = true,
'v' => flags.version = true,
'r' => flags.reload = true,
other => return Err(format!("bad option -{}", other)),
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}
}
} else {
rest.push(a.clone());
}
}
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// add any remaining arguments to `rest`
rest.extend(arg_iter.map(|s| s.clone()));
return Ok((flags, rest));
}
#[test]
fn test_set_flags_1() {
let (flags, rest) = set_flags(svec!["deno", "--version"]).unwrap();
assert_eq!(rest, svec!["deno"]);
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assert_eq!(
flags,
DenoFlags {
version: true,
..DenoFlags::default()
}
);
}
#[test]
fn test_set_flags_2() {
let (flags, rest) =
set_flags(svec!["deno", "-r", "-D", "script.ts"]).unwrap();
assert_eq!(rest, svec!["deno", "script.ts"]);
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assert_eq!(
flags,
DenoFlags {
log_debug: true,
reload: true,
..DenoFlags::default()
}
);
}
#[test]
fn test_set_flags_3() {
let (flags, rest) =
set_flags(svec!["deno", "-r", "--deps", "script.ts", "--allow-write"])
.unwrap();
assert_eq!(rest, svec!["deno", "script.ts"]);
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assert_eq!(
flags,
DenoFlags {
reload: true,
allow_write: true,
deps_flag: true,
..DenoFlags::default()
}
);
}
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#[test]
fn test_set_flags_4() {
let (flags, rest) =
set_flags(svec!["deno", "-Dr", "script.ts", "--allow-write"]).unwrap();
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assert_eq!(rest, svec!["deno", "script.ts"]);
assert_eq!(
flags,
DenoFlags {
log_debug: true,
reload: true,
allow_write: true,
..DenoFlags::default()
}
);
}
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#[test]
fn test_set_flags_5() {
let (flags, rest) = set_flags(svec!["deno", "--types"]).unwrap();
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assert_eq!(rest, svec!["deno"]);
assert_eq!(
flags,
DenoFlags {
types_flag: true,
..DenoFlags::default()
}
)
}
#[test]
fn test_set_bad_flags_1() {
let err = set_flags(svec!["deno", "--unknown-flag"]).unwrap_err();
assert_eq!(err, "bad option --unknown-flag");
}
#[test]
fn test_set_bad_flags_2() {
// This needs to be changed if -z is added as a flag
let err = set_flags(svec!["deno", "-z"]).unwrap_err();
assert_eq!(err, "bad option -z");
}
// Returns args passed to V8, followed by args passed to JS
fn v8_set_flags_preprocess(args: Vec<String>) -> (Vec<String>, Vec<String>) {
let mut rest = vec![];
// Filter out args that shouldn't be passed to V8
let mut args: Vec<String> = args
.into_iter()
.filter(|arg| {
if arg.as_str() == "--help" {
rest.push(arg.clone());
return false;
}
true
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})
.collect();
// Replace args being sent to V8
for idx in 0..args.len() {
if args[idx] == "--v8-options" {
mem::swap(args.get_mut(idx).unwrap(), &mut String::from("--help"));
}
}
(args, rest)
}
#[test]
fn test_v8_set_flags_preprocess_1() {
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let js_args = v8_set_flags_preprocess(vec![
"deno".to_string(),
"--v8-options".to_string(),
]);
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assert_eq!(
js_args,
(vec!["deno".to_string(), "--help".to_string()], vec![])
);
}
#[test]
fn test_v8_set_flags_preprocess_2() {
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let js_args =
v8_set_flags_preprocess(vec!["deno".to_string(), "--help".to_string()]);
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assert_eq!(
js_args,
(vec!["deno".to_string()], vec!["--help".to_string()])
);
}
// Pass the command line arguments to v8.
// Returns a vector of command line arguments that v8 did not understand.
pub fn v8_set_flags(args: Vec<String>) -> Vec<String> {
// deno_set_v8_flags(int* argc, char** argv) mutates argc and argv to remove
// flags that v8 understands.
// First parse core args, then converto to a vector of C strings.
let (argv, rest) = v8_set_flags_preprocess(args);
let mut argv = argv
.iter()
.map(|arg| CString::new(arg.as_str()).unwrap().into_bytes_with_nul())
.collect::<Vec<_>>();
// Make a new array, that can be modified by V8::SetFlagsFromCommandLine(),
// containing mutable raw pointers to the individual command line args.
let mut c_argv = argv
.iter_mut()
.map(|arg| arg.as_mut_ptr() as *mut i8)
.collect::<Vec<_>>();
// Store the length of the argv array in a local variable. We'll pass a
// pointer to this local variable to deno_set_v8_flags(), which then
// updates its value.
let mut c_argc = c_argv.len() as c_int;
// Let v8 parse the arguments it recognizes and remove them from c_argv.
unsafe {
libdeno::deno_set_v8_flags(&mut c_argc, c_argv.as_mut_ptr());
};
// If c_argc was updated we have to change the length of c_argv to match.
c_argv.truncate(c_argc as usize);
// Copy the modified arguments list into a proper rust vec and return it.
c_argv
.iter()
.map(|ptr| unsafe {
let cstr = CStr::from_ptr(*ptr as *const i8);
let slice = cstr.to_str().unwrap();
slice.to_string()
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})
.chain(rest.into_iter())
.collect()
}