Splits words and creates javascript / JSON friendly array

extract-words.js

#!/usr/bin/env nodejs

//-------------------------------------------------------------------------------------------------
// Developer: Robert Umbehant
//-------------------------------------------------------------------------------------------------
// Splits the input file into words, filters the words, and outputs as a javascript / JSON friendly
// array of strings.
//-------------------------------------------------------------------------------------------------

var fs = require('fs');
var path = require('path');

// https://stackoverflow.com/questions/11386492/accessing-line-number-in-v8-javascript-chrome-node-js
Object.defineProperty(global, '__stack', 
    {
        get: function() 
        {
            var orig = Error.prepareStackTrace;
            Error.prepareStackTrace = function(_, stack) {
                return stack;
            };
            var err = new Error;
            Error.captureStackTrace(err, arguments.callee);
            var stack = err.stack;
            Error.prepareStackTrace = orig;
            return stack;
        }
    });

function Log()
{
    var st = __stack[1];
    console.log(st.getFunctionName() + "(" + st.getLineNumber() + "): " + Array.prototype.slice.call(arguments).toString());
}

function main()
{
    // Ensure parameters
    if (process.argv.length <= 2)
    {
        Log("Usage: " + path.basename(__filename) + " <input-file> [max-line-length=100]");
        process.exit(-1);
    }

    // Verify root path
    var fi = process.argv[2];
    if (!fs.existsSync(fi))
    {
        Log("Input file doesn't exist : " + fi);
        process.exit(-1);
    }

    // Get max line length for output
    var max = parseInt(process.argv[3]);
    if (!Number.isInteger(max) || 0 >= max)
        max = 100;

    // Read file data
    var data = String(fs.readFileSync(fi));
    if (!data.length)
    {
        Log("File appears to be empty : " + fi);
        process.exit(-1);
    }

    // Split words
    var words = data.split(/[^a-zA-Z]+/);

    // Throw out invalid words
    words = words.filter( v => 3 <= v.length );

    // Convert to lower case
    words = words.map(v => v.toLowerCase());

    // Eliminate duplicates and sort words
    words = [...new Set(words)].sort();

    // Convert to code
    var out = "";
    var cur = max;
    for (w in words)
    {
        if (0 < out.length)
            out += ", "

        if (0 > cur)
        {
            out += "\r\n";
            cur = max;
        }

        out += "\"" + words[w] + "\""

        cur -= words[w].length + 4;
    }

    console.log(out);
}

return main();