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yakumo_izuru |
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package gcss |
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import ( |
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"bytes" |
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"io" |
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"io/ioutil" |
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"path/filepath" |
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"strings" |
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) |
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// extensions |
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const ( |
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extCSS = ".css" |
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extGCSS = ".gcss" |
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) |
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// cssFilePath converts path's extenstion into a CSS file extension. |
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var cssFilePath = func(path string) string { |
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return convertExt(path, extCSS) |
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} |
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// Compile compiles GCSS data which is read from src and |
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// Writes the result CSS data to the dst. |
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func Compile(dst io.Writer, src io.Reader) (int, error) { |
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data, err := ioutil.ReadAll(src) |
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if err != nil { |
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return 0, err |
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} |
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bc, berrc := compileBytes(data) |
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bf := new(bytes.Buffer) |
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BufWriteLoop: |
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for { |
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select { |
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case b, ok := <-bc: |
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if !ok { |
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break BufWriteLoop |
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} |
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bf.Write(b) |
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case err := <-berrc: |
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return 0, err |
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} |
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} |
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return dst.Write(bf.Bytes()) |
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} |
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// CompileFile parses the GCSS file specified by the path parameter, |
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// generates a CSS file and returns the path of the generated CSS file |
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// and an error when it occurs. |
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func CompileFile(path string) (string, error) { |
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data, err := ioutil.ReadFile(path) |
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if err != nil { |
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return "", err |
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} |
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cssPath := cssFilePath(path) |
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bc, berrc := compileBytes(data) |
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done, werrc := write(cssPath, bc, berrc) |
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select { |
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case <-done: |
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case err := <-werrc: |
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return "", err |
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} |
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return cssPath, nil |
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} |
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// compileBytes parses the GCSS byte array passed as the s parameter, |
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// generates a CSS byte array and returns the two channels: the first |
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// one returns the CSS byte array and the last one returns an error |
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// when it occurs. |
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func compileBytes(b []byte) (<-chan []byte, <-chan error) { |
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lines := strings.Split(formatLF(string(b)), lf) |
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bc := make(chan []byte, len(lines)) |
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errc := make(chan error) |
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go func() { |
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ctx := newContext() |
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elemc, pErrc := parse(lines) |
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for { |
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select { |
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case elem, ok := <-elemc: |
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if !ok { |
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close(bc) |
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return |
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} |
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elem.SetContext(ctx) |
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switch v := elem.(type) { |
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case *mixinDeclaration: |
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ctx.mixins[v.name] = v |
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case *variable: |
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ctx.vars[v.name] = v |
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case *atRule, *declaration, *selector: |
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bf := new(bytes.Buffer) |
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elem.WriteTo(bf) |
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bc <- bf.Bytes() |
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} |
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case err := <-pErrc: |
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errc <- err |
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return |
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} |
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} |
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}() |
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return bc, errc |
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} |
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// Path converts path's extenstion into a GCSS file extension. |
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func Path(path string) string { |
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return convertExt(path, extGCSS) |
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} |
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// convertExt converts path's extension into ext. |
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func convertExt(path string, ext string) string { |
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return strings.TrimSuffix(path, filepath.Ext(path)) + ext |
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} |
