var lexer = require('css-tree').lexer;
var packNumber = require('./Number').pack;
var blacklist = new Set([
    // see https://github.com/jakubpawlowicz/clean-css/issues/957
    'width',
    'min-width',
    'max-width',
    'height',
    'min-height',
    'max-height'
]);

module.exports = function compressPercentage(node, item) {
    node.value = packNumber(node.value, item);

    if (node.value === '0' && this.declaration && !blacklist.has(this.declaration.property)) {
        // try to convert a number
        item.data = {
            type: 'Number',
            loc: node.loc,
            value: node.value
        };

        // that's ok only when new value matches on length
        if (!lexer.matchDeclaration(this.declaration).isType(item.data, 'length')) {
            // otherwise rollback changes
            item.data = node;
        }
    }
};