postcss-computed

A postcss plugin helps to write and call JavaScript functions in css for computed values.

How to use?

1. Define your function:

@func verticalPercent(num_h) {
  @stmt var full_h = 1336;
  @stmt if (num_h <=0) {
    @stmt return 0;
  }
  @stmt return (num_h / full_h * 100).toFixed(5) + "%";
}

@func show be placed before the function name and @stmt before each javascript statement. That's it!

2. Call your function:

.box {
  height: func.verticalPercent(250);
  top: func.verticalPercent(0);
}

=> And you get:

.box {
  height: 18.71257%;
  top: 0;
}

When calling functions, the function name need a func. prefix.

3. It is not necessary to write function definition before function calls.

.text {
  font-size: 15px;
  line-heigth: func.lineHeight(2, 15);
}

@func lineHeight(times, fS) {
  @stmt return times * fS + "px";
}

/* compiles to: */
.text {
  font-size: 15px;
  line-heigth: 30px;
}