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import { packNumber } from './Number.js';
const MATH_FUNCTIONS = new Set([
'calc',
'min',
'max',
'clamp'
]);
const LENGTH_UNIT = new Set([
// absolute length units
'px',
'mm',
'cm',
'in',
'pt',
'pc',
// relative length units
'em',
'ex',
'ch',
'rem',
// viewport-percentage lengths
'vh',
'vw',
'vmin',
'vmax',
'vm'
]);
export default function compressDimension(node, item) {
const value = packNumber(node.value);
node.value = value;
if (value === '0' && this.declaration !== null && this.atrulePrelude === null) {
const unit = node.unit.toLowerCase();
// only length values can be compressed
if (!LENGTH_UNIT.has(unit)) {
return;
}
// issue #362: shouldn't remove unit in -ms-flex since it breaks flex in IE10/11
// issue #200: shouldn't remove unit in flex since it breaks flex in IE10/11
if (this.declaration.property === '-ms-flex' ||
this.declaration.property === 'flex') {
return;
}
// issue #222: don't remove units inside calc
if (this.function && MATH_FUNCTIONS.has(this.function.name)) {
return;
}
item.data = {
type: 'Number',
loc: node.loc,
value
};
}
};
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