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var List = require('css-tree').List;
module.exports = function compressBackground(node) {
function lastType() {
if (buffer.length) {
return buffer[buffer.length - 1].type;
}
}
function flush() {
if (lastType() === 'WhiteSpace') {
buffer.pop();
}
if (!buffer.length) {
buffer.unshift(
{
type: 'Number',
loc: null,
value: '0'
},
{
type: 'WhiteSpace',
value: ' '
},
{
type: 'Number',
loc: null,
value: '0'
}
);
}
newValue.push.apply(newValue, buffer);
buffer = [];
}
var newValue = [];
var buffer = [];
node.children.each(function(node) {
if (node.type === 'Operator' && node.value === ',') {
flush();
newValue.push(node);
return;
}
// remove defaults
if (node.type === 'Identifier') {
if (node.name === 'transparent' ||
node.name === 'none' ||
node.name === 'repeat' ||
node.name === 'scroll') {
return;
}
}
// don't add redundant spaces
if (node.type === 'WhiteSpace' && (!buffer.length || lastType() === 'WhiteSpace')) {
return;
}
buffer.push(node);
});
flush();
node.children = new List().fromArray(newValue);
};