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var packNumber = require('./Number.js').pack;
var LENGTH_UNIT = {
// absolute length units
'px': true,
'mm': true,
'cm': true,
'in': true,
'pt': true,
'pc': true,
// relative length units
'em': true,
'ex': true,
'ch': true,
'rem': true,
// viewport-percentage lengths
'vh': true,
'vw': true,
'vmin': true,
'vmax': true,
'vm': true
};
module.exports = function compressDimension(node, item) {
var value = packNumber(node.value);
node.value = value;
if (value === '0' && this.declaration) {
var unit = node.unit.toLowerCase();
// only length values can be compressed
if (!LENGTH_UNIT.hasOwnProperty(unit)) {
return;
}
// issue #200: don't remove units in flex property as it could change value meaning
if (this.declaration.property.name === 'flex') {
return;
}
// issue #222: don't remove units inside calc
if (this['function'] && this['function'].name === 'calc') {
return;
}
item.data = {
type: 'Number',
info: node.info,
value: value
};
}
};
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