/**
* @overview Song-File Lib
* @module song
* @author Dominik Sigmund
* @version 1.0
* @description Gets Json from and json to song-files
* @memberof lib-songbeamer
*/
/** Get Json from a string
* @param {string} data - String as delivered by fs.readFile
* @param {song~jsonCallback} callback - A Callback with an error or the Json
* @returns Nothing
* */
exports.toJSON = function (data, callback) {
var lines = data.split('\r')
var json = {}
json.slides = []
for (let index = 0; index < lines.length; index++) {
var line = lines[index].trim()
if (line.startsWith('#')) { // Properties
var kv = line.split('=')
json[kv[0].replace('#', '')] = kv[1]
} else { // Slides
var slide = {}
slide.lines = []
while (line !== '---') {
// check if line is a caption
if (isCaption(line)) {
slide.caption = line
} else {
slide.lines.push(line)
}
index++
if (typeof lines[index] !== 'undefined') {
line = lines[index].trim()
} else {
break
}
}
if (slide.lines.length > 0) {
json.slides.push(slide)
}
}
}
callback(null, json)
}
/** Write Json to a File String
* @param {object} json - String as delivered by fs.readFile
* @param {song~stringCallback} callback - A Callback with an error or the String as delivered to fs.writeFile
* @returns Nothing
* */
exports.toFile = function (json, callback) {
var file = ''
for (var property in json) {
if (property !== 'slides' && json.hasOwnProperty(property)) {
file += '#' + property + '=' + json[property] + '\r\n'
}
}
for (let index = 0; index < json.slides.length; index++) {
file += '---\r\n'
const slide = json.slides[index]
if (typeof slide.caption !== 'undefined') {
file += slide.caption + '\r\n'
}
for (let lineindex = 0; lineindex < slide.lines.length; lineindex++) {
const line = slide.lines[lineindex]
file += line + '\r\n'
}
}
file = file.replace(/\r\n$/, '') // remove last newline
callback(null, file)
}
/** Checks if a string is a caption (Vers, Bridge, Chorus, ...)
* @param {string} text - A Line of Text
* @returns {bool} - True, if is a caption, else false
* */
function isCaption (text) {
var captions = ['Vers', 'Verse', 'Bridge', 'Chorus', 'Refrain']
if (new RegExp(captions.join('|')).test(text)) {
return true
} else {
return false
}
}
/**
* This callback is displayed as part of the song class.
* @callback song~jsonCallback
* @param {object} Error or null
* @param {object.status} Number of Error (Uses HTTP-Status)
* @param {object.message} Custom Error Message
* @param {object} Json - The JSON. See Schema
*/
/**
* This callback is displayed as part of the song class.
* @callback song~stringCallback
* @param {object} Error or null
* @param {object.status} Number of Error (Uses HTTP-Status)
* @param {object.message} Custom Error Message
* @param {object} String - The String, as in the file
*/
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