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import {IMPORT, LAYER, COMMENT, RULESET, DECLARATION, KEYFRAMES} from './Enum.js'
import {strlen} from './Utility.js'
/**
* @param {object[]} children
* @param {function} callback
* @return {string}
*/
export function serialize (children, callback) {
var output = ''
for (var i = 0; i < children.length; i++)
output += callback(children[i], i, children, callback) || ''
return output
}
/**
* @param {object} element
* @param {number} index
* @param {object[]} children
* @param {function} callback
* @return {string}
*/
export function stringify (element, index, children, callback) {
switch (element.type) {
case LAYER: if (element.children.length) break
case IMPORT: case DECLARATION: return element.return = element.return || element.value
case COMMENT: return ''
case KEYFRAMES: return element.return = element.value + '{' + serialize(element.children, callback) + '}'
case RULESET: if (!strlen(element.value = element.props.join(','))) return ''
}
return strlen(children = serialize(element.children, callback)) ? element.return = element.value + '{' + children + '}' : ''
}
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