getline/getline_demo.js

Classes for reading line-terminated data in files

#!/usr/bin/env node

// put a copy of getline.js in the same directory as this file

var Getline = require("./getline.js");
var fs = require("fs");

console.log("First, use GetlineSync to iterate through this file\n");

// read our own demonstration file
var gl = new Getline.GetlineSync(__filename);
try {
    for (var count = 1;; ++count) {
	console.log(count + ":\t" + gl.next());
    }
}
catch (e) {
    if (e === "EOF") console.log("End of file reached");
    else console.log(e.toString());
}

console.log("\nNow, use GetlineAsync\n");

fs.open(__filename, "r", 0644,
	function (err, fd) {
	    if (err) console.log(err.toString());
	    else {
		var count = 1;
		var gl = new Getline.GetlineAsync(fd);
		gl.on("line", function (err, eof, line) {
		    if (err) console.log(err.toString());
		    else if (eof) console.log("End of file reached");
		    else {
			console.log(count + ":\t" + line);
			++count;
			gl.next(); // carry on stepping through file
		    }
		});
		gl.next(); // kick it off
	    }
	});