Question

I am constructing a tuning fork app. The fork should allow up to 12 preset pitches.

Moreover, I wish to allow the user to choose a theme. Each theme will load a set of presets (not necessary to use all of them).

My configuration file would look something like this*:

(* of course I am happy to modify the format in order to simplify the necessary code, the consideration is that the customer will be building their own file by hand, so I want to avoid unnecessary overhead / obfuscation)

theme: "A3"
comment: "An octave below concert pitch (ie A4 440Hz)"
presets: {
    A3 220Hz=220.0
}

// http://en.wikipedia.org/wiki/Guitar_tuning
theme: "Guitar Standard Tuning"
comment:"EADGBE using 12-TET tuning"
presets: {
    E2=82.41
    A2=110.00
    D3=146.83
    G3=196.00
    B3=246.94
    E4=329.63
}

theme: "Bass Guitar Standard Tuning"
comment: "EADG using 12-TET tuning"
presets: {
    E1=41.204
    A2=55.000
    D3=73.416
    G3=97.999
}

…which need to be extracted into some structure like this:

@class Preset
{
    NSString* label;
    double freq;
}

@class Theme
{
    NSString* label;
    NSMutableArray* presets;
}

NSMutableArray* themes;

What are my options? How can I achieve this tidily? Can anyone point me towards some relevant code?

(NOTE: this is NOT a duplicate of another question that has practically an identical title, so please don’t flag it just because the titles match)

Answer 1

How about parsing json? the code you posted look like json.