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1 package gcss
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2
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3 import "io"
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4
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5 // element represents an element of GCSS source codes.
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6 type element interface {
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7 io.WriterTo
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8 AppendChild(child element)
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9 Base() *elementBase
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10 SetContext(*context)
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11 Context() *context
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12 }
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13
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14 // newElement creates and returns an element.
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15 func newElement(ln *line, parent element) (element, error) {
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16 var e element
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17 var err error
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18
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19 switch {
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20 case ln.isComment():
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21 e = newComment(ln, parent)
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22 case ln.isAtRule():
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23 e = newAtRule(ln, parent)
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24 case ln.isMixinDeclaration():
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25 // error can be ignored becuase the line is checked beforehand
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26 // by calling `ln.isMixinDeclaration()`.
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27 e, _ = newMixinDeclaration(ln, parent)
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28 case ln.isMixinInvocation():
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29 // error can be ignored becuase the line is checked beforehand
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30 // by calling `ln.isMixinInvocation()`.
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31 e, _ = newMixinInvocation(ln, parent)
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32 case ln.isVariable():
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33 e, err = newVariable(ln, parent)
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34 case ln.isDeclaration():
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35 e, err = newDeclaration(ln, parent)
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36 default:
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37 e, err = newSelector(ln, parent)
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38 }
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39
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40 return e, err
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41 }
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