source: code/trunk/vendor/github.com/yosssi/gcss/element.go@ 67

package gcss

import "io"

// element represents an element of GCSS source codes.
type element interface {
        io.WriterTo
        AppendChild(child element)
        Base() *elementBase
        SetContext(*context)
        Context() *context
}

// newElement creates and returns an element.
func newElement(ln *line, parent element) (element, error) {
        var e element
        var err error

        switch {
        case ln.isComment():
                e = newComment(ln, parent)
        case ln.isAtRule():
                e = newAtRule(ln, parent)
        case ln.isMixinDeclaration():
                // error can be ignored becuase the line is checked beforehand
                // by calling `ln.isMixinDeclaration()`.
                e, _ = newMixinDeclaration(ln, parent)
        case ln.isMixinInvocation():
                // error can be ignored becuase the line is checked beforehand
                // by calling `ln.isMixinInvocation()`.
                e, _ = newMixinInvocation(ln, parent)
        case ln.isVariable():
                e, err = newVariable(ln, parent)
        case ln.isDeclaration():
                e, err = newDeclaration(ln, parent)
        default:
                e, err = newSelector(ln, parent)
        }

        return e, err
}