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songs.js
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songs.js
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import _cloneDeep from 'lodash/cloneDeep';
import _last from 'lodash/last';
import lineTypes from '../lineTypes';
/**
* @param {SongLine[]} allLines
* @param {Function} fn - to execute on each bar
* @returns {SongLine[]}
*/
export function forEachBarInSong(allLines, fn) {
const newLines = _cloneDeep(allLines);
newLines.forEach((line) => {
if (line.type === lineTypes.CHORD) {
line.model.allBars.forEach((bar) => {
fn(bar);
});
}
});
return newLines;
}
/**
* @param {SongLine[]} allLines
* @param {Function} fn - to execute on each chord
* @returns {SongLine[]}
*/
export function forEachChordInSong(allLines, fn) {
const newLines = _cloneDeep(allLines);
newLines.forEach((line) => {
if (line.type === lineTypes.CHORD) {
line.model.allBars.forEach((bar) => {
bar.allChords.forEach((chord) => {
fn(chord);
});
});
}
});
return newLines;
}
/**
* @param {ChordLine} chordLine
* @param {Function} fn - to execute on each chord
* @returns {ChordLine}
*/
export function forEachChordInChordLine(chordLine, fn) {
const newChordLine = _cloneDeep(chordLine);
newChordLine.allBars.forEach((bar, barIndex) => {
bar.allChords.forEach((chord, chordIndex) => {
fn(chord, chordIndex, barIndex);
});
});
return newChordLine;
}
/**
* @param {SongLine[]} allLines
* @param {String} label - the label to select
* @param {Number} n - the index of the section to select
* @returns {SongLine[]} all lines of the requested section
*/
export function getNthOfLabel(allLines, label, n) {
const selected = [];
const typesCount = {};
let enableSelect = false;
let currentLabel = '';
allLines.forEach((line) => {
if (line.type === lineTypes.SECTION_LABEL) {
currentLabel = line.model.label;
if (!typesCount[currentLabel]) {
typesCount[currentLabel] = 1;
} else {
typesCount[currentLabel]++;
}
enableSelect = line.id === label + n;
} else if (enableSelect) {
selected.push(line);
}
});
// remmove trailing directive lines
// because they likely apply to the next section
/**/
while (
_last(selected) &&
(_last(selected).type === lineTypes.KEY_DECLARATION ||
_last(selected).type === lineTypes.TIME_SIGNATURE)
) {
selected.pop();
}
/** */
return selected;
}