/* *************************************************************************************
* copyright: Copyright (c) 2021 Lowell D. Thomas, all rights reserved
* license: BSD-2-Clause (https://opensource.org/licenses/BSD-2-Clause)
* ********************************************************************************* */This is a demonstration of the JavaScript APG API, apg-api.
module.exports = function main(args) {
const separate = require('./separate');
const single = require('./single');
/* display the program arguments */
console.log('apg-api args');
console.dir(args);
/* the help screen */
let help = '';
help += 'The "apg-api" example is a demonstration of the basics of creating a parser \n';
help += 'with the JavaScript APG API. There are two examples.\n';
help += 'One generates the parser in all of the required separate steps.\n';
help += 'The other solves the same problem with a single call that wraps it all into a single step.\n';
help += 'Examine or run a debugger on these modules, "apg-examples/src/apg-api/separate.js"\n';
help += 'or "apg-examples/src/apg-api/generate.js" to study the examples.\n';
help += 'Examine and double-click "apg-examples/src/apg-api/web-apg-api.html" for web page usage.\n';
help += '\n';
help += 'Usage: npm run apg-api [-- arg]\n';
help += ' arg: help (or no arg) to display this help screen.\n';
help += ' separate to generate a parser in separate steps.\n';
help += ' single to generate a parser in a single step.\n';
help += ' all run all options.\n';
switch (args[0]) {
case 'separate':
console.log('\nDemonstrate: generating a parser in separate steps');
separate();
break;
case 'single':
console.log('\nDemonstrate: generating a parser in a single');
single();
break;
case 'all':
console.log('\nDemonstrate: generating a parser in separate steps');
separate();
console.log('\nDemonstrate: generating a parser in a single');
single();
break;
default:
console.log(help);
break;
}
};