mirror of
https://github.com/gohugoio/hugo.git
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129 lines
4.2 KiB
Go
129 lines
4.2 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package minifiers contains minifiers mapped to MIME types. This package is used
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// in both the resource transformation, i.e. resources.Minify, and in the publishing
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// chain.
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package minifiers
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import (
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"io"
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"regexp"
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"github.com/gohugoio/hugo/output"
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"github.com/gohugoio/hugo/transform"
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"github.com/gohugoio/hugo/media"
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"github.com/tdewolff/minify"
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"github.com/tdewolff/minify/css"
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"github.com/tdewolff/minify/html"
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"github.com/tdewolff/minify/js"
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"github.com/tdewolff/minify/json"
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"github.com/tdewolff/minify/svg"
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"github.com/tdewolff/minify/xml"
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)
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// Client wraps a minifier.
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type Client struct {
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m *minify.M
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}
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// Transformer returns a func that can be used in the transformer publishing chain.
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// TODO(bep) minify config etc
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func (m Client) Transformer(mediatype media.Type) transform.Transformer {
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_, params, min := m.m.Match(mediatype.Type())
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if min == nil {
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// No minifier for this MIME type
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return nil
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}
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return func(ft transform.FromTo) error {
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// Note that the source io.Reader will already be buffered, but it implements
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// the Bytes() method, which is recognized by the Minify library.
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return min.Minify(m.m, ft.To(), ft.From(), params)
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}
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}
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// Minify tries to minify the src into dst given a MIME type.
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func (m Client) Minify(mediatype media.Type, dst io.Writer, src io.Reader) error {
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return m.m.Minify(mediatype.Type(), dst, src)
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}
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// New creates a new Client with the provided MIME types as the mapping foundation.
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// The HTML minifier is also registered for additional HTML types (AMP etc.) in the
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// provided list of output formats.
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func New(mediaTypes media.Types, outputFormats output.Formats) Client {
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m := minify.New()
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htmlMin := &html.Minifier{
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KeepDocumentTags: true,
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KeepConditionalComments: true,
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}
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// We use the Type definition of the media types defined in the site if found.
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addMinifierFunc(m, mediaTypes, "text/css", "css", css.Minify)
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addMinifierFunc(m, mediaTypes, "application/javascript", "js", js.Minify)
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m.AddFuncRegexp(regexp.MustCompile("^(application|text)/(x-)?(java|ecma)script$"), js.Minify)
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addMinifierFunc(m, mediaTypes, "application/json", "json", json.Minify)
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addMinifierFunc(m, mediaTypes, "image/svg+xml", "svg", svg.Minify)
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addMinifierFunc(m, mediaTypes, "application/xml", "xml", xml.Minify)
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addMinifierFunc(m, mediaTypes, "application/rss", "xml", xml.Minify)
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// HTML
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addMinifier(m, mediaTypes, "text/html", "html", htmlMin)
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for _, of := range outputFormats {
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if of.IsHTML {
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addMinifier(m, mediaTypes, of.MediaType.Type(), "html", htmlMin)
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}
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}
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return Client{m: m}
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}
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func addMinifier(m *minify.M, mt media.Types, typeString, suffix string, min minify.Minifier) {
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resolvedTypeStr := resolveMediaTypeString(mt, typeString, suffix)
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m.Add(resolvedTypeStr, min)
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if resolvedTypeStr != typeString {
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m.Add(typeString, min)
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}
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}
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func addMinifierFunc(m *minify.M, mt media.Types, typeString, suffix string, fn minify.MinifierFunc) {
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resolvedTypeStr := resolveMediaTypeString(mt, typeString, suffix)
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m.AddFunc(resolvedTypeStr, fn)
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if resolvedTypeStr != typeString {
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m.AddFunc(typeString, fn)
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}
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}
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func resolveMediaTypeString(types media.Types, typeStr, suffix string) string {
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if m, found := resolveMediaType(types, typeStr, suffix); found {
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return m.Type()
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}
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// Fall back to the default.
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return typeStr
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}
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// Make sure we match the matching pattern with what the user have actually defined
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// in his or hers media types configuration.
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func resolveMediaType(types media.Types, typeStr, suffix string) (media.Type, bool) {
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if m, found := types.GetByType(typeStr); found {
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return m, true
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}
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if m, found := types.GetFirstBySuffix(suffix); found {
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return m, true
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}
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return media.Type{}, false
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}
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