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js: Add a command line argument to evaluate a string as a script

Browse Source 
For example:

    $ js -c "console.log(42)"
    42
This commit is contained in:
Timothy Flynn 2022-02-09 07:53:49 -05:00 committed by Linus Groh
parent 65de0d2910
commit 19d4f52a9e
Notes: sideshowbarker 2024-07-17 19:04:12 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/19d4f52a9e
Pull-request: https://github.com/SerenityOS/serenity/pull/12378
Reviewed-by: https://github.com/linusg
2 changed files with 32 additions and 13 deletions
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12
Base/usr/share/man/man1/js.md
View File

@ -28,18 +28,26 @@ Run `help()` in REPL mode to see its available built-in functions.
* `-m`, `--as-module`: Treat as module
* `-l`, `--print-last-result`: Print the result of the last statement executed.
* `-g`, `--gc-on-every-allocation`: Run garbage collection on every allocation.
* `-c`, `--disable-ansi-colors`: Disable ANSI colors
* `-i`, `--disable-ansi-colors`: Disable ANSI colors
* `-h`, `--disable-source-location-hints`: Disable source location hints
* `-s`, `--no-syntax-highlight`: Disable live syntax highlighting in the REPL
* `-c`, `--evaluate`: Evaluate the argument as a script
## Examples
Here's how you execute a script:
Here's how you execute a script from a file:
```sh
$ js ~/Source/js/type-play.js
```
Here's how you execute a script as a command line argument:
```sh
$ js -c "console.log(42)"
42
```
And here's an example of an interactive REPL session:
```js

33
Userland/Utilities/js.cpp
View File

@ -1345,6 +1345,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
bool gc_on_every_allocation = false;
bool disable_syntax_highlight = false;
StringView evaluate_script;
Vector<StringView> script_paths;
Core::ArgsParser args_parser;
@ -1355,10 +1356,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
args_parser.add_option(s_opt_bytecode, "Optimize the bytecode", "optimize-bytecode", 'p');
args_parser.add_option(s_as_module, "Treat as module", "as-module", 'm');
args_parser.add_option(s_print_last_result, "Print last result", "print-last-result", 'l');
args_parser.add_option(s_strip_ansi, "Disable ANSI colors", "disable-ansi-colors", 'c');
args_parser.add_option(s_strip_ansi, "Disable ANSI colors", "disable-ansi-colors", 'i');
args_parser.add_option(s_disable_source_location_hints, "Disable source location hints", "disable-source-location-hints", 'h');
args_parser.add_option(gc_on_every_allocation, "GC on every allocation", "gc-on-every-allocation", 'g');
args_parser.add_option(disable_syntax_highlight, "Disable live syntax highlighting", "no-syntax-highlight", 's');
args_parser.add_option(evaluate_script, "Evaluate argument as a script", "evaluate", 'c', "script");
args_parser.add_positional_argument(script_paths, "Path to script files", "scripts", Core::ArgsParser::Required::No);
args_parser.parse(arguments);
@ -1391,7 +1393,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
// FIXME: Figure out some way to interrupt the interpreter now that vm.exception() is gone.
if (script_paths.is_empty()) {
if (evaluate_script.is_empty() && script_paths.is_empty()) {
s_print_last_result = true;
interpreter = JS::Interpreter::create<ReplObject>(*vm);
ReplConsoleClient console_client(interpreter->global_object().console());
@ -1613,20 +1615,29 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
sigint_handler();
});
if (script_paths.size() > 1)
warnln("Warning: Multiple files supplied, this will concatenate the sources and resolve modules as if it was the first file");
StringBuilder builder;
for (auto& path : script_paths) {
auto file = TRY(Core::File::open(path, Core::OpenMode::ReadOnly));
auto file_contents = file->read_all();
auto source = StringView { file_contents };
builder.append(source);
StringView source_name;
if (evaluate_script.is_empty()) {
if (script_paths.size() > 1)
warnln("Warning: Multiple files supplied, this will concatenate the sources and resolve modules as if it was the first file");
for (auto& path : script_paths) {
auto file = TRY(Core::File::open(path, Core::OpenMode::ReadOnly));
auto file_contents = file->read_all();
auto source = StringView { file_contents };
builder.append(source);
}
source_name = script_paths[0];
} else {
builder.append(evaluate_script);
source_name = "eval"sv;
}
// We resolve modules as if it is the first file
if (!parse_and_run(*interpreter, builder.string_view(), script_paths[0]))
if (!parse_and_run(*interpreter, builder.string_view(), source_name))
return 1;
}