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// Copyright 2020 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package dartsass
import (
"fmt"
"io"
"net/url"
"path"
"path/filepath"
"strings"
"github.com/gohugoio/hugo/common/herrors"
"github.com/gohugoio/hugo/common/hexec"
"github.com/gohugoio/hugo/htesting"
"github.com/gohugoio/hugo/media"
"github.com/gohugoio/hugo/resources"
"github.com/gohugoio/hugo/resources/internal"
"github.com/spf13/afero"
"github.com/gohugoio/hugo/hugofs"
"github.com/bep/godartsass"
)
const (
// See https://github.com/sass/dart-sass-embedded/issues/24
// Note: This prefix must be all lower case.
stdinPrefix = "hugostdin:"
dartSassEmbeddedBinaryName = "dart-sass-embedded"
)
// Supports returns whether dart-sass-embedded is found in $PATH.
func Supports() bool {
if htesting.SupportsAll() {
return true
}
return hexec.InPath(dartSassEmbeddedBinaryName)
}
type transform struct {
optsm map[string]any
c *Client
}
func (t *transform) Key() internal.ResourceTransformationKey {
return internal.NewResourceTransformationKey(transformationName, t.optsm)
}
func (t *transform) Transform(ctx *resources.ResourceTransformationCtx) error {
ctx.OutMediaType = media.CSSType
opts, err := decodeOptions(t.optsm)
if err != nil {
return err
}
if opts.TargetPath != "" {
ctx.OutPath = opts.TargetPath
} else {
ctx.ReplaceOutPathExtension(".css")
}
baseDir := path.Dir(ctx.SourcePath)
filename := stdinPrefix
if ctx.SourcePath != "" {
filename += t.c.sfs.RealFilename(ctx.SourcePath)
}
args := godartsass.Args{
URL: filename,
IncludePaths: t.c.sfs.RealDirs(baseDir),
ImportResolver: importResolver{
baseDir: baseDir,
c: t.c,
},
OutputStyle: godartsass.ParseOutputStyle(opts.OutputStyle),
EnableSourceMap: opts.EnableSourceMap,
}
// Append any workDir relative include paths
for _, ip := range opts.IncludePaths {
info, err := t.c.workFs.Stat(filepath.Clean(ip))
if err == nil {
filename := info.(hugofs.FileMetaInfo).Meta().Filename
args.IncludePaths = append(args.IncludePaths, filename)
}
}
if ctx.InMediaType.SubType == media.SASSType.SubType {
args.SourceSyntax = godartsass.SourceSyntaxSASS
}
res, err := t.c.toCSS(args, ctx.From)
if err != nil {
if sassErr, ok := err.(godartsass.SassError); ok {
start := sassErr.Span.Start
context := strings.TrimSpace(sassErr.Span.Context)
filename, _ := urlToFilename(sassErr.Span.Url)
if strings.HasPrefix(filename, stdinPrefix) {
filename = filename[len(stdinPrefix):]
}
offsetMatcher := func(m herrors.LineMatcher) bool {
return m.Offset+len(m.Line) >= start.Offset && strings.Contains(m.Line, context)
}
return herrors.NewFileErrorFromFile(sassErr, filename, filename, hugofs.Os, offsetMatcher)
}
return err
}
out := res.CSS
_, err = io.WriteString(ctx.To, out)
if err != nil {
return err
}
if opts.EnableSourceMap && res.SourceMap != "" {
if err := ctx.PublishSourceMap(res.SourceMap); err != nil {
return err
}
_, err = fmt.Fprintf(ctx.To, "\n\n/*# sourceMappingURL=%s */", path.Base(ctx.OutPath)+".map")
}
return err
}
type importResolver struct {
baseDir string
c *Client
}
func (t importResolver) CanonicalizeURL(url string) (string, error) {
filePath, isURL := urlToFilename(url)
var prevDir string
var pathDir string
if isURL {
var found bool
prevDir, found = t.c.sfs.MakePathRelative(filepath.Dir(filePath))
if !found {
// Not a member of this filesystem, let Dart Sass handle it.
return "", nil
}
} else {
prevDir = t.baseDir
pathDir = path.Dir(url)
}
basePath := filepath.Join(prevDir, pathDir)
name := filepath.Base(filePath)
// Pick the first match.
var namePatterns []string
if strings.Contains(name, ".") {
namePatterns = []string{"_%s", "%s"}
} else if strings.HasPrefix(name, "_") {
namePatterns = []string{"_%s.scss", "_%s.sass"}
} else {
namePatterns = []string{"_%s.scss", "%s.scss", "_%s.sass", "%s.sass"}
}
name = strings.TrimPrefix(name, "_")
for _, namePattern := range namePatterns {
filenameToCheck := filepath.Join(basePath, fmt.Sprintf(namePattern, name))
fi, err := t.c.sfs.Fs.Stat(filenameToCheck)
if err == nil {
if fim, ok := fi.(hugofs.FileMetaInfo); ok {
return "file://" + filepath.ToSlash(fim.Meta().Filename), nil
}
}
}
// Not found, let Dart Dass handle it
return "", nil
}
func (t importResolver) Load(url string) (string, error) {
filename, _ := urlToFilename(url)
b, err := afero.ReadFile(hugofs.Os, filename)
return string(b), err
}
// TODO(bep) add tests
func urlToFilename(urls string) (string, bool) {
u, err := url.ParseRequestURI(urls)
if err != nil {
return filepath.FromSlash(urls), false
}
p := filepath.FromSlash(u.Path)
if u.Host != "" {
// C:\data\file.txt
p = strings.ToUpper(u.Host) + ":" + p
}
return p, true
}
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