Parse a string into a command and arguments in JavaScript

Question

I need to parse lines intended for cross-spawn

From the following lines:

cmd foo bar
cmd "foo bar" --baz boom
cmd "baz \"boo\" bam"
cmd "foo 'bar bud' jim" jam
FOO=bar cmd baz

To the object:

{command: 'cmd', args: ['foo', 'bar']}
{command: 'cmd', args: ['foo bar', '--baz', 'boom']}
{command: 'cmd', args: ['baz "boo" bam']}
{command: 'cmd', args: ['foo \'bar bud\' jim', 'jam']}
{command: 'cmd', args: ['baz'], env: {FOO: 'bar'}}

I think regex will be possible, but I would like to avoid writing something ordinary. Does anyone know anything existing that can do this?

Edit

The question and answers are still valuable, but for my specific use case I no longer need to do this. Instead, I use spawn-command(more precisely, I will use spawn-command-with-kill), which does not require separation commandand args. It will make life a lot easier for me. Thank!

Answer 1

, :

• minimist Substack
• yargs, node

; minimist 30 , yargs .

, CLI, env, IMO ( , , )

Answer 2

...

^\s*(?:((?:(?:"(?:\\.|[^"])*")|(?:'[^']*')|(?:\\.)|\S)+)\s*)$

... . .

function parse_cmdline(cmdline) {
    var re_next_arg = /^\s*((?:(?:"(?:\\.|[^"])*")|(?:'[^']*')|\\.|\S)+)\s*(.*)$/;
    var next_arg = ['', '', cmdline];
    var args = [];
    while (next_arg = re_next_arg.exec(next_arg[2])) {
        var quoted_arg = next_arg[1];
        var unquoted_arg = "";
        while (quoted_arg.length > 0) {
            if (/^"/.test(quoted_arg)) {
                var quoted_part = /^"((?:\\.|[^"])*)"(.*)$/.exec(quoted_arg);
                unquoted_arg += quoted_part[1].replace(/\\(.)/g, "$1");
                quoted_arg = quoted_part[2];
            } else if (/^'/.test(quoted_arg)) {
                var quoted_part = /^'([^']*)'(.*)$/.exec(quoted_arg);
                unquoted_arg += quoted_part[1];
                quoted_arg = quoted_part[2];
            } else if (/^\\/.test(quoted_arg)) {
                unquoted_arg += quoted_arg[1];
                quoted_arg = quoted_arg.substring(2);
            } else {
                unquoted_arg += quoted_arg[0];
                quoted_arg = quoted_arg.substring(1);
            }
        }
        args[args.length] = unquoted_arg;
    }
    return args;
}

Answer 3

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https://www.npmjs.com/package/js-parse

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