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1 package gcss
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2
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3 import (
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4 "bytes"
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5 "io"
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6 "strings"
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7 )
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8
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9 // atRule represents an at-rule of CSS.
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10 type atRule struct {
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11 elementBase
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12 }
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13
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14 // WriteTo writes the at-rule to the writer.
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15 func (ar *atRule) WriteTo(w io.Writer) (int64, error) {
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16 bf := new(bytes.Buffer)
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17
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18 bf.WriteString(strings.TrimSpace(ar.ln.s))
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19
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20 if len(ar.sels) == 0 && len(ar.decs) == 0 && !ar.hasMixinDecs() && !ar.hasMixinSels() {
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21 bf.WriteString(semicolon)
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22 n, err := w.Write(bf.Bytes())
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23 return int64(n), err
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24 }
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25
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26 bf.WriteString(openBrace)
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27
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28 // Writing to the bytes.Buffer never returns an error.
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29 ar.writeDecsTo(bf, nil)
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30
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31 for _, sel := range ar.sels {
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32 // Writing to the bytes.Buffer never returns an error.
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33 sel.WriteTo(bf)
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34 }
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35
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36 // Write the mixin's selectors.
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37 for _, mi := range ar.mixins {
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38 sels, prms := mi.selsParams()
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39
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40 for _, sl := range sels {
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41 sl.parent = ar
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42 // Writing to the bytes.Buffer never returns an error.
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43 sl.writeTo(bf, prms)
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44 }
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45 }
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46
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47 bf.WriteString(closeBrace)
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48
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49 n, err := w.Write(bf.Bytes())
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50
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51 return int64(n), err
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52 }
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53
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54 // newAtRule creates and returns a at-rule.
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55 func newAtRule(ln *line, parent element) *atRule {
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56 return &atRule{
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57 elementBase: newElementBase(ln, parent),
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58 }
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59 }
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