code: function createStylefromCode(styles, abspath) {
      //may import other file
      const arr = queryImport(styles)
      const baseRes = handleImportStyle(styles, abspath)
      const obj = {}
      const ast = csstree.parse(baseRes);
      csstree.walk(ast, {
          enter: function (node) {
              if (node.type === 'Rule' && node.prelude && node.prelude.type === 'SelectorList') {
                  const clzName = []
                  node.prelude.children.forEach(e => {
                      //we may handle each class selector here
                      let ans = selectorBlockHandler(e)
                      if (ans) {
                          //to save before value
                          obj[ans] = obj[ans] || {}
                          //save ans to log which to give value
                          clzName.push(ans)
                      }
                  })
                  const styleArray = []
                  node.block.children.forEach(e => {
                      //handle with unit or function case
                      const styleItem = styleBlockHandler(e)
                      styleItem.length > 0 && styleArray.push(styleItem)
                  })
                  clzName.forEach(e => {
                      try {
                          const styleObject = transform(styleArray)
                          if (styleObject.fontWeight) {
                              //fontWeight must be string
                              styleObject.fontWeight = styleObject.fontWeight + ""
                          }
                          Object.assign(obj[e], styleObject)
                      } catch (e) {
                          console.error("convert ", abspath, " error:", e.message)
                      }
  
                  })
              }
          },
      })
      return {styles: obj, imports: arr}
  }
docs: create style object from css file content,which is raw string.
  @param styles styles styles css file content
  @param abspath project file path
  @returns {{styles, imports: Array}}