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package gcss |
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|
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import ( |
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"bytes" |
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"fmt" |
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"io" |
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"strings" |
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) |
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|
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// selector represents a selector of CSS. |
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type selector struct { |
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elementBase |
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name string |
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} |
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|
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// WriteTo writes the selector to the writer. |
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func (sel *selector) WriteTo(w io.Writer) (int64, error) { |
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return sel.writeTo(w, nil) |
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} |
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|
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// writeTo writes the selector to the writer. |
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func (sel *selector) writeTo(w io.Writer, params map[string]string) (int64, error) { |
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bf := new(bytes.Buffer) |
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|
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// Write the declarations. |
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if len(sel.decs) > 0 || sel.hasMixinDecs() { |
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bf.WriteString(sel.names()) |
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bf.WriteString(openBrace) |
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|
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// Writing to the bytes.Buffer never returns an error. |
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sel.writeDecsTo(bf, params) |
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|
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bf.WriteString(closeBrace) |
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} |
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|
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// Write the child selectors. |
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for _, childSel := range sel.sels { |
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// Writing to the bytes.Buffer never returns an error. |
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childSel.writeTo(bf, params) |
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} |
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|
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// Write the mixin's selectors. |
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for _, mi := range sel.mixins { |
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sels, prms := mi.selsParams() |
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|
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for _, sl := range sels { |
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sl.parent = sel |
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// Writing to the bytes.Buffer never returns an error. |
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sl.writeTo(bf, prms) |
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} |
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} |
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|
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n, err := w.Write(bf.Bytes()) |
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|
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return int64(n), err |
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} |
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|
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// names returns the selector names. |
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func (sel *selector) names() string { |
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bf := new(bytes.Buffer) |
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|
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switch parent := sel.parent.(type) { |
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case nil, *atRule: |
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for _, name := range strings.Split(sel.name, comma) { |
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if bf.Len() > 0 { |
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bf.WriteString(comma) |
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} |
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|
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bf.WriteString(strings.TrimSpace(name)) |
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} |
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case *selector: |
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for _, parentS := range strings.Split(parent.names(), comma) { |
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for _, s := range strings.Split(sel.name, comma) { |
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if bf.Len() > 0 { |
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bf.WriteString(comma) |
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} |
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|
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s = strings.TrimSpace(s) |
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|
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if strings.Index(s, ampersand) != -1 { |
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bf.WriteString(strings.Replace(s, ampersand, parentS, -1)) |
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} else { |
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bf.WriteString(parentS) |
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bf.WriteString(space) |
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bf.WriteString(s) |
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} |
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} |
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} |
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} |
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|
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return bf.String() |
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} |
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|
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// newSelector creates and returns a selector. |
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func newSelector(ln *line, parent element) (*selector, error) { |
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name := strings.TrimSpace(ln.s) |
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|
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if strings.HasSuffix(name, openBrace) { |
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return nil, fmt.Errorf("selector must not end with %q [line: %d]", openBrace, ln.no) |
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} |
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|
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if strings.HasSuffix(name, closeBrace) { |
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return nil, fmt.Errorf("selector must not end with %q [line: %d]", closeBrace, ln.no) |
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} |
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|
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return &selector{ |
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elementBase: newElementBase(ln, parent), |
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name: name, |
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}, nil |
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} |
