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// Copyright 2018 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 minifiers contains minifiers mapped to MIME types. This package is used
// in both the resource transformation, i.e. resources.Minify, and in the publishing
// chain.
package minifiers
import (
"io"
"regexp"
"github.com/gohugoio/hugo/output"
"github.com/gohugoio/hugo/transform"
"github.com/gohugoio/hugo/media"
"github.com/tdewolff/minify"
"github.com/tdewolff/minify/css"
"github.com/tdewolff/minify/html"
"github.com/tdewolff/minify/js"
"github.com/tdewolff/minify/json"
"github.com/tdewolff/minify/svg"
"github.com/tdewolff/minify/xml"
)
// Client wraps a minifier.
type Client struct {
m *minify.M
}
// Transformer returns a func that can be used in the transformer publishing chain.
// TODO(bep) minify config etc
func (m Client) Transformer(mediatype media.Type) transform.Transformer {
_, params, min := m.m.Match(mediatype.Type())
if min == nil {
// No minifier for this MIME type
return nil
}
return func(ft transform.FromTo) error {
// Note that the source io.Reader will already be buffered, but it implements
// the Bytes() method, which is recognized by the Minify library.
return min.Minify(m.m, ft.To(), ft.From(), params)
}
}
// Minify tries to minify the src into dst given a MIME type.
func (m Client) Minify(mediatype media.Type, dst io.Writer, src io.Reader) error {
return m.m.Minify(mediatype.Type(), dst, src)
}
// New creates a new Client with the provided MIME types as the mapping foundation.
// The HTML minifier is also registered for additional HTML types (AMP etc.) in the
// provided list of output formats.
func New(mediaTypes media.Types, outputFormats output.Formats) Client {
m := minify.New()
htmlMin := &html.Minifier{
KeepDocumentTags: true,
KeepConditionalComments: true,
KeepEndTags: true,
}
// We use the Type definition of the media types defined in the site if found.
addMinifierFunc(m, mediaTypes, "text/css", "css", css.Minify)
addMinifierFunc(m, mediaTypes, "application/javascript", "js", js.Minify)
m.AddFuncRegexp(regexp.MustCompile("^(application|text)/(x-)?(java|ecma)script$"), js.Minify)
addMinifierFunc(m, mediaTypes, "application/json", "json", json.Minify)
addMinifierFunc(m, mediaTypes, "image/svg+xml", "svg", svg.Minify)
addMinifierFunc(m, mediaTypes, "application/xml", "xml", xml.Minify)
addMinifierFunc(m, mediaTypes, "application/rss", "xml", xml.Minify)
// HTML
addMinifier(m, mediaTypes, "text/html", "html", htmlMin)
for _, of := range outputFormats {
if of.IsHTML {
addMinifier(m, mediaTypes, of.MediaType.Type(), "html", htmlMin)
}
}
return Client{m: m}
}
func addMinifier(m *minify.M, mt media.Types, typeString, suffix string, min minify.Minifier) {
resolvedTypeStr := resolveMediaTypeString(mt, typeString, suffix)
m.Add(resolvedTypeStr, min)
if resolvedTypeStr != typeString {
m.Add(typeString, min)
}
}
func addMinifierFunc(m *minify.M, mt media.Types, typeString, suffix string, fn minify.MinifierFunc) {
resolvedTypeStr := resolveMediaTypeString(mt, typeString, suffix)
m.AddFunc(resolvedTypeStr, fn)
if resolvedTypeStr != typeString {
m.AddFunc(typeString, fn)
}
}
func resolveMediaTypeString(types media.Types, typeStr, suffix string) string {
if m, found := resolveMediaType(types, typeStr, suffix); found {
return m.Type()
}
// Fall back to the default.
return typeStr
}
// Make sure we match the matching pattern with what the user have actually defined
// in his or hers media types configuration.
func resolveMediaType(types media.Types, typeStr, suffix string) (media.Type, bool) {
if m, found := types.GetByType(typeStr); found {
return m, true
}
if m, found := types.GetFirstBySuffix(suffix); found {
return m, true
}
return media.Type{}, false
}
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