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# AMU
AMU is a human readable markup language I made for my own uses and to learn. It is the first lexer and parser that I have written by hand.
---
### Purpose
The purpose of this project is to create a markup language for my own use. I will use this primarily for quickly writing simple documents, for example, taking notes in class or doing some quick homework. It fulfills all my needs and I will add things as I need them. There are functions for extensibility when adding a new thing to parse is not justified.
---
### Usage
This repo is a library for parsing AMU. It can be imported and used like any other go library. In `cmd`, there are binaries for interacting with AMU. `cmd/amu` contains a command line program that takes a file with AMU or reads from stdin and outputs HTML. In `cmd/amulive`, there is a Gtk app that provides a real-time preview of the document on the right with a text box on the left.
---
### Syntax
The syntax for most of AMU's features can be seen in test.amu in this repo.
---
### Performance
Timing this program using the test file, I consistently get 4ms run time on my XPS 13. This is much faster than the projects I have made before for a similar purpose, although it is likely unnoticeable for most people.

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/*
AMU: Custom simple markup language
Copyright (C) 2021 Arsen Musayelyan
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
// Package amu provides convenience functions for converting amu source to HTML
package amu
import (
"bytes"
"io"
"strings"
"go.arsenm.dev/amu/ast"
"go.arsenm.dev/amu/formatter/html"
"go.arsenm.dev/amu/parser"
)
// Funcs stores functions for use in amu
var Funcs = ast.FuncMap{}
// ToHTML parses the contents of r and formats it as HTML
func ToHTML(r io.Reader) (string, error) {
// Create new AMU parser
p := parser.New(r)
// Parse into AST
AST, err := p.Parse()
if err != nil {
return "", err
}
// Create new HTML formatter with AST and Funcs
formatter := html.NewFormatter(AST, Funcs)
// Return formatted source
return formatter.Format(), nil
}
// StringToHTML parses s and formats it as HTML
func StringToHTML(s string) (string, error) {
return ToHTML(strings.NewReader(s))
}
// BytesToHTML parses the contents of b and formats it as HTML
func BytesToHTML(b []byte) (string, error) {
return ToHTML(bytes.NewReader(b))
}

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/*
AMU: Custom simple markup language
Copyright (C) 2021 Arsen Musayelyan
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package ast
import "fmt"
// FormatType represents the type of
// formatting to be done on a string
type FormatType int
const (
FormatTypeBold FormatType = iota
FormatTypeItalic
FormatTypeMath
FormatTypeCode
FormatTypeStrike
)
// AST is the root of the Abstract Syntax Tree for AMU
type AST struct {
Entries []Entry
}
// Entry represents a single entry in the AST
type Entry struct {
Heading *Heading
Image *Image
List *List
Code *Code
Para *Para
Break *Break
Hline *Hline
}
// Break represents a line break
type Break struct{}
// Hline represents a horizontal line
type Hline struct{}
// Heading represents a heading
type Heading struct {
Level int
Content *Para
}
// Image represents an image with alternate text
// in case it fails to load and a clickable link
type Image struct {
Alternate string
Source string
Link string
}
// List represents a list of items
type List struct {
Type string
Items []ListItem
}
// ListItem represents an item
// with a level in a list
type ListItem struct {
Level int
Content []*Para
}
// Code represents source code to be
// highlighted.
type Code struct {
Language string
Style string
Text string
}
// Para represents a paragraph
type Para struct {
Fragments []ParaFragment
}
// ParaFragment represents parts of
// a paragraph which may or may not
// be text
type ParaFragment struct {
Word *string
Whitespace *string
Punct *string
Link *Link
Format *Format
Func *Func
}
// Link represents a hyperlink
type Link struct {
Link string
Text string
}
// Format represents formatted text
type Format struct {
Types []FormatType
Text string
}
// Func represents a function call
type Func struct {
Name string
Args []string
}
// Funcs represents a place from which to retrieve
// functions for calls
type Funcs interface {
Set(string, func([]string) string)
Get(string) (func([]string) string, error)
Run(string, []string) string
}
// FuncMap is an implementation of Funcs using a map
type FuncMap map[string]func([]string) string
// Set adds a fucntion to the map
func (fm FuncMap) Set(name string, fn func([]string) string) {
fm[name] = fn
}
// Get gets a function from the map
func (fm FuncMap) Get(name string) (func([]string) string, error) {
// Get function
fn, ok := fm[name]
// If does not exist
if !ok {
// Return error
return nil, fmt.Errorf("func %s does not exist", name)
}
// Return function
return fn, nil
}
// Run runs a function in the map
func (fm FuncMap) Run(name string, args []string) string {
// Return output of function
return fm[name](args)
}

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/*
AMU: Custom simple markup language
Copyright (C) 2021 Arsen Musayelyan
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"fmt"
"log"
"os"
"go.arsenm.dev/amu"
)
func main() {
var src *os.File
// Get source file based on arguments
if len(os.Args) < 2 {
src = os.Stdin
} else {
// Open file in first argument
file, err := os.Open(os.Args[1])
if err != nil {
log.Fatalln(err)
}
// Set source to file
src = file
}
// Convert source to HTML
html, err := amu.ToHTML(src)
if err != nil {
log.Fatalln(err)
}
// Print output HTML
fmt.Println(html)
}

35
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/*
AMU: Custom simple markup language
Copyright (C) 2021 Arsen Musayelyan
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import "github.com/gotk3/gotk3/gtk"
type AccelGroup struct {
*gtk.AccelGroup
}
func NewAccel() (*AccelGroup, error) {
gtkAg, err := gtk.AccelGroupNew()
return &AccelGroup{AccelGroup: gtkAg}, err
}
func (ag *AccelGroup) Add(acc string, f interface{}) {
key, mods := gtk.AcceleratorParse(acc)
ag.Connect(key, mods, gtk.ACCEL_VISIBLE, f)
}

142
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/*
AMU: Custom simple markup language
Copyright (C) 2021 Arsen Musayelyan
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"io/ioutil"
"os"
"github.com/gotk3/gotk3/gtk"
sourceview "github.com/linuxerwang/sourceview3"
)
// saveFile opens a file selection dialog if the file has not already
// been saved and saves the current buffer contents at the chosen filename
func saveFile(win gtk.IWindow, buf *sourceview.SourceBuffer) error {
// If no opened file
if openedFile == "" {
// Create new file chooser dialog with two buttons
fcd, err := gtk.FileChooserDialogNewWith2Buttons(
"Save",
win,
gtk.FILE_CHOOSER_ACTION_SAVE,
"Cancel",
gtk.RESPONSE_CANCEL,
"Save",
gtk.RESPONSE_APPLY,
)
if err != nil {
return err
}
// Do not destroy dialog with parent
fcd.SetDestroyWithParent(false)
// Create new file filter
amuFilter, err := gtk.FileFilterNew()
if err != nil {
return err
}
// Add pattern to filter
amuFilter.AddPattern("*.amu")
// Add filter to dialog
fcd.AddFilter(amuFilter)
// Run dialog
fcdRt := fcd.Run()
if fcdRt == gtk.RESPONSE_APPLY {
// Set openedFile to chosen filename
openedFile = fcd.GetFilename()
} else {
// Destroy dialog
fcd.Destroy()
// Return no error
return nil
}
// Destroy dialog
fcd.Destroy()
}
// Create chosen file
file, err := os.Create(openedFile)
if err != nil {
return err
}
// Get text from source buffer
amu, err := buf.GetText(buf.GetStartIter(), buf.GetEndIter(), true)
if err != nil {
return err
}
// Wtite text to file
_, err = file.Write([]byte(amu))
if err != nil {
return err
}
// Set buffer modified to false
buf.SetModified(false)
return nil
}
// openFile loads the contents of the chosen file into the buffer
func openFile(win gtk.IWindow, buf *sourceview.SourceBuffer) error {
// Create new file chooser dialog with two buttons
fcd, err := gtk.FileChooserDialogNewWith2Buttons(
"Open",
win,
gtk.FILE_CHOOSER_ACTION_SAVE,
"Cancel",
gtk.RESPONSE_CANCEL,
"Open",
gtk.RESPONSE_APPLY,
)
if err != nil {
return err
}
// Do not destroy dialog with parent
fcd.SetDestroyWithParent(false)
// Create new file filter
amuFilter, err := gtk.FileFilterNew()
if err != nil {
return err
}
// Add pattern to file filter
amuFilter.AddPattern("*.amu")
// Add file filter to dialog
fcd.AddFilter(amuFilter)
// Run dialog
respType := fcd.Run()
if respType == gtk.RESPONSE_APPLY {
// Set openedFile to chosen filename
openedFile = fcd.GetFilename()
} else {
// Destroy dialog
fcd.Destroy()
// Return no error
return nil
}
// Destroy dialog
fcd.Destroy()
// Read opened file
data, err := ioutil.ReadFile(openedFile)
if err != nil {
return err
}
// Set text in buffer
buf.SetText(string(data))
// Set buffer modified to false
buf.SetModified(false)
return nil
}

308
cmd/amulive/main.go Normal file
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/*
AMU: Custom simple markup language
Copyright (C) 2021 Arsen Musayelyan
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
//"fmt"
"encoding/json"
"fmt"
"io/ioutil"
"os"
"runtime"
"strings"
"github.com/gotk3/gotk3/glib"
"github.com/gotk3/gotk3/gtk"
sourceview "github.com/linuxerwang/sourceview3"
"github.com/pkg/browser"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"github.com/sourcegraph/go-webkit2/webkit2"
"go.arsenm.dev/amu/ast"
"go.arsenm.dev/amu/formatter/html"
"go.arsenm.dev/amu/parser"
)
func init() {
log.Logger = log.Output(zerolog.ConsoleWriter{Out: os.Stderr})
}
var head = `<style>
/* Text formatting
body:not(.cd) {
white-space: pre-line;
}*/
body {
color: %s;
background-color: %s;
word-wrap: break-word;
}
@media print {
body {
color: black;
background-color: white;
}
}
/* Headings */
h1 { margin: 0; }
h2 { margin: 0; }
h3 { margin: 0; }
h4 { margin: 0; }
h5 { margin: 0; }
h6 { margin: 0; }
</style>
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.13.18/dist/katex.min.css" crossorigin="anonymous">
<script defer src="https://cdn.jsdelivr.net/npm/katex@0.13.18/dist/katex.min.js" crossorigin="anonymous"></script>
<script defer src="https://cdn.jsdelivr.net/npm/katex@0.13.18/dist/contrib/auto-render.min.js" integrity="sha384-vZTG03m+2yp6N6BNi5iM4rW4oIwk5DfcNdFfxkk9ZWpDriOkXX8voJBFrAO7MpVl" crossorigin="anonymous"
onload="renderMathInElement(document.body);"></script>
<!--script>
function renderMath() {
var math = document.getElementsByClassName("math");
for (var i = 0; i < math.length; i++) {
math[i].innerHTML = katex.renderToString(math[i].innerText, {throwOnError: false});
}
}
</script-->`
const document = `<!DOCTYPE html>
<html>
<head>%s</head>
<body>%s</body>
</html>`
var openedFile string
func main() {
// Lock goroutine to current thread for Gtk
runtime.LockOSThread()
// Initialize Gtk
gtk.Init(nil)
// Create new Gtk window
window, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
if err != nil {
log.Fatal().Err(err).Msg("Unable to create window")
}
// Set window title
window.SetTitle("AMULive")
// Stop Gtk main loop when window destroyed
window.Connect("destroy", gtk.MainQuit)
// Create new horizontal box layout with 6px padding
layout, err := gtk.BoxNew(gtk.ORIENTATION_HORIZONTAL, 6)
if err != nil {
log.Fatal().Err(err).Msg("Unable to create box")
}
// Add layout to window
window.Add(layout)
// Create new scrolled winfow
textScrollWindow, err := gtk.ScrolledWindowNew(nil, nil)
if err != nil {
log.Fatal().Err(err).Msg("Unable to create scrolled window")
}
// Create new source view
srcView, err := sourceview.SourceViewNew()
if err != nil {
log.Fatal().Err(err).Msg("Unable to create text virw")
}
// Set tab width to 4
srcView.SetProperty("tab-width", uint(4))
// Set auto indent to true
srcView.SetProperty("auto-indent", true)
// Set show line numbers to true
srcView.SetShowLineNumbers(true)
// Set left margin to 8 (separates text from line numbers)
srcView.SetLeftMargin(8)
// Set monospace to true
srcView.SetMonospace(true)
// Set wrap mode to wrap word char (3)
srcView.SetWrapMode(gtk.WRAP_WORD_CHAR)
// Add text to scrolled window
textScrollWindow.Add(srcView)
// Add scrolled window to layout with no padding
layout.PackStart(textScrollWindow, true, true, 0)
// Get source view style context
styleCtx, err := srcView.GetStyleContext()
if err != nil {
log.Fatal().Err(err).Msg("Unable to get style context of text view")
}
// Get style background color
bgCol, err := styleCtx.GetProperty("background-color", gtk.STATE_FLAG_NORMAL)
if err != nil {
log.Fatal().Err(err).Msg("Unable to get background-color property of style context")
}
// Get style foreground color
fgCol := styleCtx.GetColor(gtk.STATE_FLAG_NORMAL)
// Expand head tag template
head = fmt.Sprintf(head, fgCol, bgCol)
// Create new webview
webkit := webkit2.NewWebView()
// Enable devtools in webview
webkit.Settings().SetProperty("enable-developer-extras", true)
// Load empty base HTML document
webkit.LoadHTML(fmt.Sprintf(document, head, ""), "amu")
// Add webview to layout with no padding
layout.PackStart(webkit, true, true, 0)
// Get source view buffer
srcBuf, err := srcView.GetBuffer()
if err != nil {
log.Fatal().Err(err).Msg("Error getting buffer from text view")
}
// On source view change
srcBuf.Connect("changed", func() {
loadAMU(srcBuf, webkit)
})
// On load change
webkit.Connect("load-changed", func(_ *glib.Object, le webkit2.LoadEvent) {
switch le {
case webkit2.LoadStarted, webkit2.LoadCommitted, webkit2.LoadRedirected:
// Get current webview URL
curURL := webkit.URI()
// If url is not "amu"
if curURL != "amu" {
// Stop loading
webkit.RunJavaScript("window.stop();", nil)
// Open URL in browser concurrently
go browser.OpenURL(curURL)
// Load base HTML
webkit.LoadHTML(fmt.Sprintf(document, head, ""), "amu")
}
case webkit2.LoadFinished:
// If URL is "amu"
if webkit.URI() == "amu" {
// Load AMU from source buffer
loadAMU(srcBuf, webkit)
}
}
})
// Create new accelerator group
accelGroup, err := NewAccel()
if err != nil {
log.Fatal().Err(err).Msg("Error creating accelerator group")
}
// Set Ctrl+P to print via JavaScript
accelGroup.Add("<Control>p", func() {
webkit.RunJavaScript("window.print();", nil)
})
// Set Ctrl+S to save file
accelGroup.Add("<Control>s", func() {
err := saveFile(window, srcBuf)
if err != nil {
log.Error().Err(err).Msg("Error saving file")
}
})
// Set Ctrl+O to open file
accelGroup.Add("<Control>o", func() {
err := openFile(window, srcBuf)
if err != nil {
log.Error().Err(err).Msg("Error opening file")
}
})
// Add underlying gtk accelerator group to window
window.AddAccelGroup(accelGroup.AccelGroup)
// On window delete event
window.Connect("delete-event", func() bool {
// If source buffer not modified
if !srcBuf.GetModified() {
// Close window
return false
}
// Create confirmation dialog
dlg := gtk.MessageDialogNew(
window,
gtk.DIALOG_MODAL,
gtk.MESSAGE_WARNING,
gtk.BUTTONS_YES_NO,
"Are you sure you want to close?\nYou have unsaved changes.",
)
// Run confirmation dialog and get response
respType := dlg.Run()
dlg.Close()
switch respType {
case gtk.RESPONSE_YES:
return false
case gtk.RESPONSE_NO:
return true
}
return true
})
if len(os.Args) > 1 {
openedFile = os.Args[1]
data, err := ioutil.ReadFile(openedFile)
if err != nil {
log.Fatal().Err(err).Msg("Error opening start file")
}
srcBuf.SetText(string(data))
srcBuf.SetModified(false)
}
window.SetDefaultSize(800, 600)
window.ShowAll()
gtk.Main()
}
func loadAMU(srcBuf *sourceview.SourceBuffer, webkit *webkit2.WebView) {
// Get all text in buffer
src, err := srcBuf.GetText(srcBuf.GetStartIter(), srcBuf.GetEndIter(), true)
if err != nil {
log.Error().Err(err).Msg("Error getting amu source from text view")
return
}
p := parser.New(strings.NewReader(src))
AST, err := p.Parse()
if err != nil {
log.Error().Err(err).Msg("Error parsing amu source")
return
}
formatter := html.NewFormatter(AST, ast.FuncMap{})
// Execute source from buffer
html := formatter.Format()
// Generate full HTML document and encode as JSON for JavaScript
data, err := json.Marshal(html)
if err != nil {
log.Error().Err(err).Msg("Error marshaling string as JSON")
return
}
// Update webview document
webkit.RunJavaScript(fmt.Sprintf(`document.body.innerHTML = %s; renderMathInElement(document.body);`, data), nil)
}

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/*
AMU: Custom simple markup language
Copyright (C) 2021 Arsen Musayelyan
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package html
import (
"bytes"
"fmt"
"strings"
"github.com/alecthomas/chroma"
"github.com/alecthomas/chroma/formatters/html"
"github.com/alecthomas/chroma/lexers"
"github.com/alecthomas/chroma/styles"
"go.arsenm.dev/amu/ast"
)
// HTMLFormatter formats an AMU AST into HTML source
type HTMLFormatter struct {
Funcs ast.Funcs
ast *ast.AST
out *bytes.Buffer
}
// NewFormatter creates a new HTML formatter using the proided AST and functions
func NewFormatter(ast *ast.AST, funcs ast.Funcs) *HTMLFormatter {
return &HTMLFormatter{ast: ast, Funcs: funcs, out: &bytes.Buffer{}}
}
// formatPara formats a paragraph from the AST into HTML
func (h *HTMLFormatter) formatPara(para *ast.Para, includeTags bool) {
// If tags are to be included
if includeTags {
// Write opening p tag to buffer
h.out.WriteString("<p>")
}
// For every fragment in paragraph
for _, fragment := range para.Fragments {
if fragment.Word != nil {
// Write word to buffer
h.out.WriteString(*fragment.Word)
} else if fragment.Whitespace != nil {
// Write whitespace to buffer
h.out.WriteString(*fragment.Whitespace)
} else if fragment.Punct != nil {
// Write punctuatuon to buffer
h.out.WriteString(*fragment.Punct)
} else if fragment.Format != nil {
// For every format type, write appropriate opening tag to buffer
for _, ftype := range fragment.Format.Types {
if ftype == ast.FormatTypeBold {
h.out.WriteString("<strong>")
}
if ftype == ast.FormatTypeItalic {
h.out.WriteString("<em>")
}
if ftype == ast.FormatTypeCode {
h.out.WriteString("<code>")
}
if ftype == ast.FormatTypeStrike {
h.out.WriteString(`<del>`)
}
if ftype == ast.FormatTypeMath {
h.out.WriteString(`\(`)
}
}
// Write format text to buffer
h.out.WriteString(fragment.Format.Text)
// For every format type, write appropriate closing tag to buffer in reverse
for i := len(fragment.Format.Types) - 1; i >= 0; i-- {
ftype := fragment.Format.Types[i]
if ftype == ast.FormatTypeBold {
h.out.WriteString("</strong>")
}
if ftype == ast.FormatTypeItalic {
h.out.WriteString("</em>")
}
if ftype == ast.FormatTypeCode {
h.out.WriteString("</code>")
}
if ftype == ast.FormatTypeStrike {
h.out.WriteString(`</del>`)
}
if ftype == ast.FormatTypeMath {
h.out.WriteString(`\)`)
}
}
} else if fragment.Func != nil {
// Attempt to get requested function
fn, err := h.Funcs.Get(fragment.Func.Name)
if err != nil {
// Write error text to function
h.out.WriteString("Error running function: " + err.Error())
// Continue to next AST entry
continue
}
// Write output of function to buffer
h.out.WriteString(fn(fragment.Func.Args))
} else if fragment.Link != nil {
// Write link to buffer
fmt.Fprintf(h.out, `<a href="%s">%s</a>`, fragment.Link.Link, fragment.Link.Text)
}
}
// If tags are to be included
if includeTags {
// Write closing p tag to buffer
h.out.WriteString("</p>")
}
}
// Format formats the provided AST into an HTML string
func (h *HTMLFormatter) Format() string {
// For every entry in AST
for _, entry := range h.ast.Entries {
if entry.Heading != nil {
// Write opening heading tag
fmt.Fprintf(h.out, "<h%d>", entry.Heading.Level)
// Format paragraph with heading content without tags
h.formatPara(entry.Heading.Content, false)
// Write closing heading tag
fmt.Fprintf(h.out, "</h%d>", entry.Heading.Level)
} else if entry.Para != nil {
// Format paragraph with tags
h.formatPara(entry.Para, true)
} else if entry.Image != nil {
// If image link exists
if entry.Image.Link != "" {
// Write opening link tag
fmt.Fprintf(h.out, `<a href="%s">`, entry.Image.Link)
}
// Weite image tag
fmt.Fprintf(h.out, `<img src="%s" alt="%s">`, entry.Image.Source, entry.Image.Alternate)
// If image link exists
if entry.Image.Link != "" {
// Write closing link tag
h.out.WriteString("</a>")
}
} else if entry.List != nil {
var openTag, closeTag string
// Set opening and closing tags depending on list type
switch entry.List.Type {
case "unordered":
openTag = "<ul>"
closeTag = "</ul>"
case "ordered":
openTag = "<ol>"
closeTag = "</ol>"
default:
// Write unknown list type
h.out.WriteString("unknown list type " + entry.List.Type)
// Continue to next entry
continue
}
// Create variables for keeping track of list state
lastLevel := 0
openLists := 0
for _, item := range entry.List.Items {
if item.Level > lastLevel {
// Get amount of lists to open
amtOpen := item.Level - lastLevel
// Increment openLists by amount
openLists += amtOpen
// Write opening tag the amount of times required
h.out.WriteString(strings.Repeat(openTag, amtOpen))
// Set lastLevel
lastLevel = item.Level
} else if item.Level < lastLevel {
// Get amount of lists to close
amtClose := lastLevel - item.Level
// DEcrement openLists by amount
openLists -= amtClose
// Write closing tag the amount of times required
h.out.WriteString(strings.Repeat(closeTag, amtClose))
// Set lastLevel
lastLevel = item.Level
}
// If content exists
if len(item.Content) > 0 {
// Write opening list item tag to output
h.out.WriteString("<li>")
// Format content as paragraph
h.formatPara(item.Content[0], true)
// Write closing list item tag to output
h.out.WriteString("</li>")
// For every line other than the first
for _, line := range item.Content[1:] {
// Format content as paragraph
h.formatPara(line, true)