LESS - set 3 variables depending on another variable's value

Question

I've got a mixin that accepts two parameters:

.build-logo(ab, 200px);

The first is an acronym string for one of our products, and the second is square width/height of the desired logo. What I need is a set of guarded mixins that test against the value of the first parameter - but here's where my knowledge of LESS falls short.

I think it needs to be something like this, but I can't get the syntax down:

.set-logo-colors() when (@acronym = 'ab') {
    @first-color: red;
    @second-color: green;
    @third-color: blue;
}

Then the 3 color variables declared above need to be available in the previously mentioned .build-logo() mixin.

Any help, tips, or advice is welcome. Thank you!

Answer 1

You could write parameter specific mixins instead of using guards, like:

.set-logo-colors(ab) {
    @first-color: red;
    @second-color: green;
    @third-color: blue;
}
.set-logo-colors(bc) {
    @first-color: orange;
    @second-color: blue;
    @third-color: gray;
}

which will be executed when you pass the right parameter.

And to elaborate this approach a little, you could do something like:

.logo(@product) {
    .set-logo-colors(@product);
    .build-logo(@product, 200px);
}

and lets say build-logo looks like this

.build-logo(@a, @b) {
    product: @a;
    width: @b;
    color: @first-color;
}

by calling

.logo(ac);

you get:

product: ab;
width: 200px;
color: #ff0000;

More than one product:

There will be a problem, if you call more than one product, the color variable will be already set and

.logo(bc);

will return:

product: bc;
width: 200px;
color: #ff0000;

which is not what we want.

So it would be better to start with a set of multiparametric mixins:

.build-logo(@a, @b, @color1, @color2, @colo3) {
    product: @a;
    width: @b;
    color: @color1;
}

.logo(ab, @size) {
    .build-logo (ab, @size, red, green, blue);
}

.logo(bc, @size) {
    .build-logo (bc, @size, green, orange, gray);
}

now calling

.logo(ab, 200px);

gives the same output as above, but it will not overlap/overwrite anything when calling it for another product. So:

.logo(bc,200px);

returns:

product: bc;
width: 200px;
color: #008000;