--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/github.com/yosssi/gcss/compile.go	Sun Jul 23 13:18:53 2023 +0000
@@ -0,0 +1,130 @@
+package gcss
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+	"path/filepath"
+	"strings"
+)
+
+// extensions
+const (
+	extCSS  = ".css"
+	extGCSS = ".gcss"
+)
+
+// cssFilePath converts path's extenstion into a CSS file extension.
+var cssFilePath = func(path string) string {
+	return convertExt(path, extCSS)
+}
+
+// Compile compiles GCSS data which is read from src and
+// Writes the result CSS data to the dst.
+func Compile(dst io.Writer, src io.Reader) (int, error) {
+	data, err := ioutil.ReadAll(src)
+
+	if err != nil {
+		return 0, err
+	}
+
+	bc, berrc := compileBytes(data)
+
+	bf := new(bytes.Buffer)
+
+BufWriteLoop:
+	for {
+		select {
+		case b, ok := <-bc:
+			if !ok {
+				break BufWriteLoop
+			}
+
+			bf.Write(b)
+		case err := <-berrc:
+			return 0, err
+		}
+	}
+
+	return dst.Write(bf.Bytes())
+}
+
+// CompileFile parses the GCSS file specified by the path parameter,
+// generates a CSS file and returns the path of the generated CSS file
+// and an error when it occurs.
+func CompileFile(path string) (string, error) {
+	data, err := ioutil.ReadFile(path)
+
+	if err != nil {
+		return "", err
+	}
+
+	cssPath := cssFilePath(path)
+
+	bc, berrc := compileBytes(data)
+
+	done, werrc := write(cssPath, bc, berrc)
+
+	select {
+	case <-done:
+	case err := <-werrc:
+		return "", err
+	}
+
+	return cssPath, nil
+}
+
+// compileBytes parses the GCSS byte array passed as the s parameter,
+// generates a CSS byte array and returns the two channels: the first
+// one returns the CSS byte array and the last one returns an error
+// when it occurs.
+func compileBytes(b []byte) (<-chan []byte, <-chan error) {
+	lines := strings.Split(formatLF(string(b)), lf)
+
+	bc := make(chan []byte, len(lines))
+	errc := make(chan error)
+
+	go func() {
+		ctx := newContext()
+
+		elemc, pErrc := parse(lines)
+
+		for {
+			select {
+			case elem, ok := <-elemc:
+				if !ok {
+					close(bc)
+					return
+				}
+
+				elem.SetContext(ctx)
+
+				switch v := elem.(type) {
+				case *mixinDeclaration:
+					ctx.mixins[v.name] = v
+				case *variable:
+					ctx.vars[v.name] = v
+				case *atRule, *declaration, *selector:
+					bf := new(bytes.Buffer)
+					elem.WriteTo(bf)
+					bc <- bf.Bytes()
+				}
+			case err := <-pErrc:
+				errc <- err
+				return
+			}
+		}
+	}()
+
+	return bc, errc
+}
+
+// Path converts path's extenstion into a GCSS file extension.
+func Path(path string) string {
+	return convertExt(path, extGCSS)
+}
+
+// convertExt converts path's extension into ext.
+func convertExt(path string, ext string) string {
+	return strings.TrimSuffix(path, filepath.Ext(path)) + ext
+}