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iCal format parser
'use strict';
function convert(fileData, callback) {
if (typeof fileData !== "string") {
return callback(
new Error("Invalid file data passed.")
);
}
var lines = joinLines(fileData);
var calendar = parseNode(lines, {});
if (callback instanceof Function) {
return callback(null, calendar);
}
return calendar;
}
function joinLines(fileData) {
var lines = fileData.split(/\r\n|\n|\r/);
var result = [];
var buffer;
while (lines.length > 0) {
var line = lines.shift();
var isNew = line[0] !== ' ';
if (isNew) {
if (buffer) {
result.push(buffer);
}
buffer = line;
} else {
buffer = buffer + line.substr(1);
}
}
if (buffer) {
result.push(buffer);
}
return result;
}
function parseNode (lines, node) {
var key;
var val;
while (lines.length > 0) {
var line = lines.shift();
var tag = /^([^:;]+)([:;])/.exec(line);
if (!tag) {
// Google calendar returns broken lines :'(
lines[0] += line;
continue;
}
switch (tag[1]) {
case 'BEGIN':
key = line.substr(tag[0].length);
val = parseNode(lines, {});
if (node[key]) {
val = [].concat(node[key], val);
}
node[key] = val;
break;
case 'END':
return node;
default:
key = tag[1];
val = parseValue(
line.substr(tag[0].length)
);
if (node[key]) {
node[key] = [].concat(node[key] || [], val);
} else {
node[key] = val;
}
}
}
return node;
}
function parseValue (value) {
var result = {};
var pairs = value.split(';');
while (pairs.length > 0) {
var p = pairs.shift().split('=', 2);
if (p.length === 1 && pairs.length === 0) {
return p[0];
}
if (result[p[0]]) {
result[p[0]] = [].concat(result[p[0]], p[1]);
} else {
result[p[0]] = p[1];
}
}
return result;
}
module.exports = {
convert: convert
}
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