parse command

parse.js

#!/usr/bin/env node

/*
 * Given a string return a map in the form { cmd: 'args', cmd2: 'args' }
 */
function parseCommand(s) {
  m = {}
  state = 0;
  currentcmd = '';
  currentargs = '';
  for (i = 0; i < s.length; i++) {
    c = s[i];
    //console.log(c, ' ', state);
    switch (state) {
      case 0:
        if (c != ' ') {
          state = 1;
          currentcmd += c;
        }
        break;
      case 1:
        if (c == ' ') {
          state = 2;
        } else {
          currentcmd += c;
        }
        break;
      case 2:
        if (c != ' ') {
          state = 3;
          currentargs += c;
        }
        break;
      case 3:
        if (c == '\n') {
          state = 0;
          m[currentcmd] = currentargs;
          currentcmd = '';
          currentargs = '';
        } else {
          currentargs += c;
        }
        break;
    }
  }
  m[currentcmd] = currentargs;
  return m;
}

var cmds = ['mono program.exe arg1 arg2',
            '   mono program.exe arg1 arg2',
            'cmd1 arg1 arg2 arg3\n    cmd2        arg11 arg12 etc    '];
cmds.forEach(function(c) {
  console.log(c, parseCommand(c));
});

/*
 * Requires node.js
 * $ node parse.js
 * mono program.exe arg1 arg2 { mono: 'program.exe arg1 arg2' }
 * mono program.exe arg1 arg2 { mono: 'program.exe arg1 arg2' }
 * cmd1 arg1 arg2 arg3
 *      cmd2        arg11 arg12 etc     { cmd1: 'arg1 arg2 arg3', cmd2: 'arg11 arg12 etc    ' }
 */