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chord-parser

chord-parser

Utility for parsing guitar chords contained within a string of tablature. The most common use case is to wrap all chords found within a song in an anchor tag so that their finger chart can be presented in a tooltip.

Install

npm install chord-parser

or if using on the web, grab the dist/chord-parser.min.js file.

Usage

var input = '\
 Gsus4                Fsus4 F                     Csus4    C      Gsus4/B     \
e|------------3-------------------1-----|-------1---------------0-----------| \
B|---------3-----3-------------------1--|----------------1------1-------1---| \
G|------5-----------5-----3--2----------|----2--------------0--------------0| \
D|-5-------------------5--3--3----------|-3-----------3-----2---------0-----| \
A|--------------------------------------|----------3---------------2--------| \
E|--------------------------------------|-----------------------------------| ';
 
// Import chord-parser 
var ChordParser = require('chord-parser');
 
// Create a new ChordParser object with the input string 
var tabs = new ChordParser(input);
 
// Wrap chords found in the string (Gsus4, Fsus4, etc.) with an anchor tag 
var wrappedTab = tabs.wrap(function(chord) {
  return '<a href="">' + chord + '</a>';
});
 
// Return an array of unique chords found in the string 
var uniques = tabs.unique(); // => ['C', 'Csus4', 'F', 'Fsus4', 'Gsus4', 'Gsus4/B']; 

API

constructor

Create a new chord parsing object passing in a string of guitar tabs/chords to parse:

var parser = new ChordParser(inputString);

wrap(replacerFn[, options]);

This method calls the function replacerFn for each chord it finds in the input string, passing in the chord in as its only argument. Your wrapper function should return a string to replace the chord with. A modified version of the input string with the transposed replacements is returned.

new ChordParser('Ab C#').wrap(function(chord) {
  return '<a>' + chord + '</a>';
});
 
// Return value: '<a>Ab</a> <a>C#</a>' 

all([options])

Return a sorted array of all chords found in the input string.

new ChordParser('Ab C# B C#').all();
 
// Return value: ['Ab', 'B', 'C#', 'C#'] 

unique([options])

Return a sorted array of unique chords found in the input string.

new ChordParser('Ab C# B C#').unique();
 
// Return value: ['Ab', 'B', 'C#'] 

Options

All methods accept an options object as their last argument (or in unique and all's case, the only argument).

  • ignorecase (boolean) - Whether or not to ignore case sensitivity when searching the string for chords. Defaults to false.

Tests

Run npm test.

License

MIT.