225 lines
5.6 KiB
Go
225 lines
5.6 KiB
Go
// Copyright 2019 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 gemtext converts Gemtext (text/gemini) to HTML.
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package gemtext
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import (
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"fmt"
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"html"
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"strings"
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"github.com/gohugoio/hugo/identity"
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"github.com/gohugoio/hugo/markup/converter"
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)
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/// Provider is the package entry point.
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var Provider converter.ProviderProvider = provider{}
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type provider struct {
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}
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func (p provider) New(cfg converter.ProviderConfig) (converter.Provider, error) {
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return converter.NewProvider("gemtext", func(ctx converter.DocumentContext) (converter.Converter, error) {
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return &gemtextConverter{
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ctx: ctx,
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cfg: cfg,
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}, nil
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}), nil
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}
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type gemtextConverter struct {
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ctx converter.DocumentContext
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cfg converter.ProviderConfig
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}
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func (c *gemtextConverter) Convert(ctx converter.RenderContext) (converter.Result, error) {
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return &gemtextResult{
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output: Convert(string(ctx.Src)),
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}, nil
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}
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func Convert(src string) string {
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var output strings.Builder
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const (
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stateDefault = iota
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stateParagraph
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stateQuote
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stateList
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stateLinks
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statePreformatted
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)
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state := stateDefault
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switchState := func(newState int) {
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switch state {
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case stateParagraph:
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output.WriteString("</p>\n")
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case stateQuote:
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output.WriteString("</p>\n</blockquote>\n")
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case statePreformatted:
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output.WriteString("</pre>\n</figure>\n")
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case stateList:
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fallthrough
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case stateLinks:
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output.WriteString("</ul>\n")
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}
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state = newState
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}
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// iterate line by line
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for _, line := range strings.Split(src, "\n") {
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if state == statePreformatted {
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if strings.HasPrefix(line, "```") {
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switchState(stateDefault)
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} else {
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output.WriteString(html.EscapeString(line))
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output.WriteString("\n")
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}
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continue
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}
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// check line type
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if strings.HasPrefix(line, "###") {
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switchState(stateDefault)
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stripped := strings.TrimPrefix(line, "###")
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output.WriteString("<h3>")
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output.WriteString(html.EscapeString(stripped))
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output.WriteString("</h3>\n")
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} else if strings.HasPrefix(line, "##") {
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switchState(stateDefault)
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stripped := strings.TrimPrefix(line, "##")
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output.WriteString("<h2>")
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output.WriteString(html.EscapeString(stripped))
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output.WriteString("</h2>\n")
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} else if strings.HasPrefix(line, "#") {
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switchState(stateDefault)
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stripped := strings.TrimPrefix(line, "#")
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output.WriteString("<h1>")
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output.WriteString(html.EscapeString(stripped))
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output.WriteString("</h1>\n")
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} else if strings.HasPrefix(line, "=>") {
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// link line
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if state != stateLinks {
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switchState(stateLinks)
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output.WriteString(`<ul class="links">`)
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output.WriteString("\n")
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}
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// extract url and link name
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url := ""
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linkName := ""
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withoutPrefix := strings.TrimSpace(strings.TrimPrefix(line, "=>"))
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split := strings.SplitN(withoutPrefix, " ", 2)
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if len(split) >= 1 {
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url = split[0]
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}
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if len(split) >= 2 {
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linkName = strings.TrimSpace(split[1])
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}
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output.WriteString("<li>")
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// output as an <a> tag
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output.WriteString(fmt.Sprintf(`<a href="%s">`, html.EscapeString(url)))
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if len(linkName) > 0 {
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output.WriteString(html.EscapeString(linkName))
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} else {
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output.WriteString(html.EscapeString(url))
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}
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output.WriteString("</a>\n")
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} else if strings.HasPrefix(line, "* ") {
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// list item line
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if state != stateList {
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switchState(stateList)
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output.WriteString(`<ul class="items">`)
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output.WriteString("\n")
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}
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withoutPrefix := strings.TrimPrefix(line, "* ")
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output.WriteString("<li>")
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output.WriteString(html.EscapeString(withoutPrefix))
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output.WriteString("\n")
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} else if strings.HasPrefix(line, "```") {
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// preformatted toggle
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switchState(statePreformatted)
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output.WriteString("<figure>\n")
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alt := strings.TrimSpace(strings.TrimPrefix(line, "```"))
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if len(alt) > 0 {
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output.WriteString("<figcaption>")
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output.WriteString(html.EscapeString(alt))
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output.WriteString("</figcaption>\n")
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}
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output.WriteString("<pre>\n")
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} else if strings.HasPrefix(line, ">") {
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// quoted line
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withoutPrefix := strings.TrimSpace(strings.TrimPrefix(line, ">"))
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if len(withoutPrefix) == 0 {
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output.WriteString("</p>\n<p>\n")
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} else if state == stateQuote {
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output.WriteString("<br>\n")
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} else {
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switchState(stateQuote)
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output.WriteString("<blockquote>\n")
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output.WriteString("<p>\n")
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}
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output.WriteString(html.EscapeString(withoutPrefix))
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output.WriteString("\n")
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} else if len(strings.TrimSpace(line)) == 0 {
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// empty line, go back to default state
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switchState(stateDefault)
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} else {
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// fallback to text line
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if state == stateParagraph {
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output.WriteString("<br>\n")
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} else {
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switchState(stateParagraph)
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output.WriteString("<p>\n")
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}
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output.WriteString(html.EscapeString(line))
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output.WriteString("\n")
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}
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}
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// ensure no tags are left open
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switchState(stateDefault)
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return output.String()
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}
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func (c *gemtextConverter) Supports(feature identity.Identity) bool {
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return false
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}
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type gemtextResult struct {
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output string
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}
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func (r gemtextResult) Bytes() []byte {
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return []byte(r.output)
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}
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