/* *************************************************************************************
* copyright: Copyright (c) 2021 Lowell D. Thomas, all rights reserved
* license: BSD-2-Clause (https://opensource.org/licenses/BSD-2-Clause)
* ********************************************************************************* */Demonstrations of parsing sub-strings of the input string.
module.exports = function main(args) {
/* display the program arguments */
console.log('look-behind args');
console.dir(args);
/* the help screen */
let desc = '';
desc += 'The "substrings" example demonstrates the ability of the parser\n';
desc += 'to parse only a substring of the full input string.\n';
desc += 'Examine or run a debugger on this module, "apg-js-examples/src/substrings/main.js" to study the example.\n';
let help = '';
help += 'Usage: npm run substrings [-- arg]\n';
help += ' arg: help (or no arg) to display this help screen.\n';
help += ' lookaround demonstrates setting the substring to allow look around operations\n';
help += ' simple demonstrates simply parsing a phrase that is in the middle of a string\n';
help += ' all run all demonstrations\n';
if (!args[0]) {
/* display the help screen and exit */
console.log(desc);
console.log(help);
return;
}
switch (args[0]) {
case 'help':
console.log(help);
return;
case 'lookaround':
console.log('\nDemonstrate: setting the substring to allow look around operations');
require('./lookaround');
break;
case 'simple':
console.log('\nDemonstrate: simply parsing a phrase that is in the middle of a string');
require('./simple');
break;
case 'all':
console.log('\nDemonstrate: setting the substring to allow look around operations');
require('./lookaround');
console.log('\nDemonstrate: simply parsing a phrase that is in the middle of a string');
require('./simple');
break;
default:
console.log(`unrecognized argument: ${args[0]}`);
console.log(help);
}
};