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document-converter.js
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document-converter.js
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/* global Opal */
const fs = require('fs')
const ospath = require('path')
const { layer: faLayer, icon: faIcon, dom: faDom, library: faLibrary } = require('@fortawesome/fontawesome-svg-core')
const { faCircle, faInfoCircle, faExclamationCircle, faQuestionCircle, faExclamationTriangle, faHandPaper, fas } = require('@fortawesome/free-solid-svg-icons')
const { faLightbulb, far } = require('@fortawesome/free-regular-svg-icons')
const { fab } = require('@fortawesome/free-brands-svg-icons')
faLibrary.add(fas, far, fab)
const faDefaultIcon = faIcon(faQuestionCircle)
const faImportantIcon = faIcon(faExclamationCircle)
const faNoteIcon = faIcon(faInfoCircle)
const faWarningIcon = faIcon(faExclamationTriangle)
const faCautionIcon = faLayer((push) => {
push(faIcon(faCircle))
push(faIcon(faHandPaper, { transform: { size: 10, x: -0.5 }, classes: 'fa-inverse' }))
})
const faTipIcon = faLayer((push) => {
push(faIcon(faCircle))
push(faIcon(faLightbulb, { transform: { size: 10 }, classes: 'fa-inverse' }))
})
const DropAnchorRx = /<(?:a[^>+]+|\/a)>/
class DocumentPDFConverter {
/* eslint-disable camelcase */
constructor () {
this.baseConverter = Opal.Asciidoctor.Html5Converter.create()
// <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.6/styles/github.min.css"/>
this.linkStylesheet = /(<link rel="stylesheet"[^>]*\/>)/g
this.stemContent = require('./stem')
this.repeatTableElementsContent = fs.readFileSync(ospath.join(__dirname, 'repeating-table-elements.js'), 'utf8')
this.pagedContent = fs.readFileSync(require.resolve('@ggrossetie/pagedjs/dist/paged.polyfill.js'), 'utf8')
this.pagedRendering = fs.readFileSync(`${__dirname}/paged-rendering.js`, 'utf8')
const stylesDirectoryPath = ospath.resolve(`${__dirname}/../../css`)
this.asciidoctorStyleContent = fs.readFileSync(`${stylesDirectoryPath}/asciidoctor.css`, 'utf8')
this.documentStyleContent = fs.readFileSync(`${stylesDirectoryPath}/document.css`, 'utf8')
this.titleDocumentStyleContent = fs.readFileSync(`${stylesDirectoryPath}/features/title-document-numbering.css`, 'utf8')
this.titlePageStyleContent = fs.readFileSync(`${stylesDirectoryPath}/features/title-page.css`, 'utf8')
this.bookStyleContent = fs.readFileSync(`${stylesDirectoryPath}/features/book.css`, 'utf8')
}
convert (node, transform, opts) {
const name = `convert_${transform || node.node_name}`
const convertFunction = this[name]
if (convertFunction) {
return convertFunction.call(this, node)
}
return this.baseConverter.convert(node, transform, opts)
}
convert_document (node, opts = {}) {
const cdnBaseUrl = `${this.assetUriScheme(node)}//cdnjs.cloudflare.com/ajax/libs`
const linkcss = node.isAttribute('linkcss')
let contentHTML = ''
const content = node.getContent()
if (content && content.trim() !== '') {
contentHTML = `<div id="content" class="content">
${content}
</div>`
}
const syntaxHighlighter = node.$syntax_highlighter()
const bodyAttrs = node.getId() ? [`id="${node.getId()}"`] : []
let classes
if (node.hasSections() && node.isAttribute('toc-class') && node.isAttribute('toc') && node.isAttribute('toc-placement', 'auto')) {
classes = [node.getDoctype(), node.getAttribute('toc-class'), `toc-${node.getAttribute('toc-position', 'header')}`]
} else {
classes = [node.getDoctype()]
}
if (node.hasRole()) {
classes.push(node.getRole())
}
bodyAttrs.push(`class="${classes.join(' ')}"`)
if (node.hasAttribute('max-width')) {
bodyAttrs.push(`style="max-width: ${node.getAttribute('max-width')};"`)
}
return `<!DOCTYPE html>
<html dir="ltr"${this.langAttr(node)}>
<head>
<title>${node.getDocumentTitle({ sanitize: true, use_fallback: true })}</title>
<meta charset="UTF-8">
${this.fontAwesomeStyle(node)}
${this.styles(node)}
<meta name="viewport" content="width=device-width, initial-scale=1.0">
${this.syntaxHighlighterHead(node, syntaxHighlighter, { cdn_base_url: cdnBaseUrl, linkcss: linkcss, self_closing_tag_slash: '/' })}
${this.docinfoContent(node, 'head', '-pdf.html')}
</head>
<body ${bodyAttrs.join(' ')}>
${this.docinfoContent(node, 'header', '-pdf.html')}
${this.docinfoContent(node, 'running', '-pdf.html')}
${this.titlePage(node)}
${this.outline(node, opts)}
${this.tocHeader(node, opts)}
${contentHTML}
${this.footnotes(node)}
${this.syntaxHighlighterFooter(node, syntaxHighlighter, { cdn_base_url: cdnBaseUrl, linkcss: linkcss, self_closing_tag_slash: '/' })}
${this.stemContent.content(node)}
<script>
${this.pagedContent}
${this.pagedRendering}
${this.repeatTableElementsContent}
</script>
${this.docinfoContent(node, 'footer', '-pdf.html')}
</body>
</html>`
}
convert_outline (node, opts = {}) {
if (!node.hasSections()) {
return
}
const sectnumlevels = opts.sectnumlevels || (parseInt(node.getDocument().getAttributes().sectnumlevels) || 3)
const toclevels = opts.toclevels || (parseInt(node.getDocument().getAttributes().toclevels) || 2)
const sections = node.getSections()
// FIXME top level is incorrect if a multipart book starts with a special section defined at level 0
const result = []
result.push(`<ul class="sectlevel${sections[0].getLevel()}">`)
let stitle
for (const section of sections) {
const slevel = section.getLevel()
if (section.getCaption()) {
stitle = section.getCaptionedTitle()
} else if (section.isNumbered() && slevel <= sectnumlevels) {
if (slevel < 2 && node.getDocument().getDoctype() === 'book') {
if (section.getSectionName() === 'chapter') {
const signifier = node.getDocument().getAttributes()['chapter-signifier']
stitle = `${signifier ? `"${signifier} "` : ''}${section['$sectnum']()} ${section.getTitle()}`
} else if (section.getSectionName() === 'part') {
const signifier = node.getDocument().getAttributes()['part-signifier']
stitle = `${signifier ? `"${signifier} "` : ''}${section['$sectnum'](Opal.nil, ':')} ${section.getTitle()}`
} else {
stitle = `${section['$sectnum']()} ${section.getTitle()}`
}
} else {
stitle = `${section['$sectnum']()} ${section.getTitle()}`
}
} else {
stitle = section.getTitle()
}
if (stitle.includes('<a')) {
stitle = stitle.replace(DropAnchorRx, '')
}
const childTocLevel = this.convert_outline(section, {
toclevels,
sectnumlevels
})
if (slevel < toclevels && childTocLevel) {
result.push(`<li class="toc-entry"><a href="#${section.getId()}">${stitle}</a>`)
result.push(`<li>${childTocLevel}</li>`)
result.push('</li>')
} else {
result.push(`<li class="toc-entry"><a href="#${section.getId()}">${stitle}</a></li>`)
}
}
result.push('</ul>')
return result.join('\n')
}
convert_admonition (node) {
const idAttribute = node.getId() ? ` id="${node.getId()}"` : ''
const name = node.getAttribute('name')
const titleElement = node.getTitle() ? `<div class="title">${node.getTitle()}</div>\n` : ''
let label
if (node.getDocument().hasAttribute('icons')) {
if (node.getDocument().isAttribute('icons', 'font') && !node.hasAttribute('icon')) {
let icon
if (name === 'note') {
icon = faNoteIcon
} else if (name === 'important') {
icon = faImportantIcon
} else if (name === 'caution') {
icon = faCautionIcon
} else if (name === 'tip') {
icon = faTipIcon
} else if (name === 'warning') {
icon = faWarningIcon
} else {
icon = faDefaultIcon
}
label = icon.html
} else {
label = `<img src="${node.getIconUri(name)}" alt="${node.getAttribute('textlabel')}"/>`
}
} else {
label = `<div class="title">${node.getAttribute('textlabel')}</div>`
}
return `<div${idAttribute} class="admonitionblock ${name}${node.getRole() ? node.getRole() : ''}">
<table>
<tr>
<td class="icon icon-${name}">
${label}
</td>
<td class="content">
${titleElement}${node.getContent()}
</td>
</tr>
</table>
</div>`
}
convert_inline_callout (node) {
return `<i class="conum" data-value="${node.text}"></i>`
}
convert_inline_image (node) {
if (node.getType() === 'icon' && this.isSvgIconEnabled(node)) {
const transform = {}
if (node.hasAttribute('rotate')) {
transform.rotate = node.getAttribute('rotate')
}
if (node.hasAttribute('flip')) {
const flip = node.getAttribute('flip')
if (flip === 'vertical' || flip === 'y' || flip === 'v') {
transform.flipY = true
} else {
transform.flipX = true
}
}
const options = {}
options.transform = transform
if (node.hasAttribute('title')) {
options.title = node.getAttribute('title')
}
options.classes = []
if (node.hasAttribute('size')) {
options.classes.push(`fa-${node.getAttribute('size')}`)
}
if (node.getRoles() && node.getRoles().length > 0) {
options.classes = options.classes.concat(node.getRoles().map(value => value.trim()))
}
const meta = {}
const target = node.getTarget()
let iconName = target
if (node.hasAttribute('set')) {
meta.prefix = node.getAttribute('set')
} else if (target.includes('@')) {
const parts = target.split('@')
iconName = parts[0]
meta.prefix = parts[1]
}
meta.iconName = iconName
const icon = faIcon(meta, options)
if (icon) {
return icon.html
}
} else {
return this.baseConverter.$convert_inline_image(node)
}
}
convert_colist (node) {
const result = []
const idAttribute = node.getId() ? ` id="${node.getId()}"` : ''
let classes = ['colist']
if (node.getStyle()) {
classes = classes.concat(node.getStyle())
}
if (node.getRole()) {
classes = classes.concat(node.getRole())
}
const classAttribute = ` class="${classes.join(' ')}"`
result.push(`<div${idAttribute}${classAttribute}>`)
if (node.getTitle()) {
result.push(`<div class="title">${node.getTitle()}</div>`)
}
if (node.getDocument().hasAttribute('icons') || node.getDocument().isAttribute('icontype', 'svg')) {
result.push('<table>')
let num = 0
const svgIcons = this.isSvgIconEnabled(node)
let numLabel
node.getItems().forEach((item) => {
num += 1
if (svgIcons) {
numLabel = `<i class="conum" data-value="${num}"></i><b>${num}</b>`
} else {
numLabel = `<i class="conum" data-value="${num}"></i><b>${num}</b>`
}
result.push(`<tr>
<td>${numLabel}</td>
<td>${item.getText()}${item['$blocks?']() ? `\n ${item.getContent()}` : ''}</td>
</tr>`)
})
result.push('</table>')
} else {
result.push('<ol>')
node.getItems().forEach((item) => {
result.push(`<li>
<p>${item.getText()}</p>${item['$blocks?']() ? `\n ${item.getContent()}` : ''}`)
})
result.push('</ol>')
}
result.push('</div>')
return result.join('\n')
}
convert_page_break () {
// Paged.js does not support inline style: https://gitlab.pagedmedia.org/tools/pagedjs/issues/146
return '<div class="page-break" style="break-after: page;"></div>'
}
convert_preamble (node, opts = {}) {
const doc = node.getDocument()
let toc
if (!this.hasTitlePage(doc) && doc.isAttribute('toc-placement', 'preamble') && doc.hasSections() && doc.hasAttribute('toc')) {
toc = `<div id="toc" class="${doc.getAttribute('toc-class', 'toc')}">
<div id="toctitle">${doc.getAttribute('toc-title')}</div>
${this.convert_outline(doc, opts)}
</div>`
} else {
toc = ''
}
return `<div id="preamble">
<div class="sectionbody">
${node.getContent()}
</div>${toc}
</div>`
}
convert_inline_footnote (node) {
if (node.getDocument().isAttribute('nofootnotes')) {
return this.baseConverter.$convert_inline_footnote(node)
}
const index = node.getAttribute('index')
const text = node.getText()
if (index) {
return `<span id="_footnote_${index}" class="footnote">${text}</span>`
}
const idAttribute = node.getId() ? ` id="_footnote_${node.getId()}"` : ''
return `<span${idAttribute} class="footnote">${text}</span>`
}
resolveStylesheet (requirePath, cwd = process.cwd()) {
// NOTE appending node_modules prevents require from looking elsewhere before looking in these paths
const paths = [cwd, ospath.dirname(__dirname)].map((start) => ospath.join(start, 'node_modules'))
return require.resolve(requirePath, { paths })
}
styles (node) {
const stylesheetAttribute = node.getAttribute('stylesheet')
// stylesheet attribute was unset using `stylesheet!` (default value is '')
if (typeof stylesheetAttribute === 'undefined') {
return ''
}
const defaultStyles = `<style>
${this.asciidoctorStyleContent}
${this.documentStyleContent}
${this.titlePageStyle(node)}
${this.documentTypeStyle(node)}
</style>`
if (stylesheetAttribute && stylesheetAttribute.trim() !== '') {
let separator = ','
// REMIND for backward compatibility, will be removed in a future version
if (stylesheetAttribute.includes(';')) {
console.warn('Using semi-colon \';\' as a separator is deprecated and will be removed in a future version. Please use comma \',\' as a separator instead.')
separator = ';'
}
const customStyles = stylesheetAttribute
.split(separator)
.map(value => value.trim().replace(/^\+/, ""))
.filter(value => value !== '')
.map(stylesheet => {
let href
if (ospath.isAbsolute(stylesheet)) {
href = stylesheet
} else {
const stylesDirectory = node.getAttribute('stylesdir')
let start
if (stylesDirectory) {
if (ospath.isAbsolute(stylesDirectory)) {
start = stylesDirectory
} else {
start = ospath.join(node.getDocument().getBaseDir(), stylesDirectory)
}
} else {
start = node.getDocument().getBaseDir()
}
href = ospath.join(start, stylesheet)
if (!fs.existsSync(href)) {
try {
href = this.resolveStylesheet(stylesheet)
} catch (_) {
console.warn(`Unable to resolve the stylesheet: ${stylesheet}`)
}
}
}
return `<link href="${href}" rel="stylesheet">`
})
.join('\n')
if (stylesheetAttribute.startsWith('+')) {
return defaultStyles + customStyles
}
return customStyles
}
return defaultStyles
}
titlePageStyle (node) {
if (this.hasTitlePage(node)) {
// The page number start after the first page (ie. the title page)
return this.titlePageStyleContent
}
return this.titleDocumentStyleContent
}
documentTypeStyle (node) {
const doc = node.getDocument()
if (doc.getDoctype() === 'book') {
return this.bookStyleContent
}
return ''
}
hasTitlePage (node) {
const doc = node.getDocument()
return doc.getDoctype() === 'book' || doc.hasAttribute('title-page')
}
footnotes (_) {
return ''
}
fontAwesomeStyle (node) {
if (this.isSvgIconEnabled(node)) {
return `<style>
${faDom.css()}
</style>`
}
return ''
}
docinfoContent (node, docinfoLocation, suffix) {
const docinfoContent = node.getDocinfo(docinfoLocation, suffix)
if (docinfoContent) {
return docinfoContent
}
return ''
}
syntaxHighlighterHead (node, syntaxHighlighter, attrs) {
let header = ''
if (syntaxHighlighter !== Opal.nil && syntaxHighlighter['$docinfo?']('head')) {
header = syntaxHighlighter.$docinfo('head', node, Opal.hash(attrs))
}
if (syntaxHighlighter !== Opal.nil && syntaxHighlighter['$docinfo?']('footer')) {
// reordering all link elements from footer to header, as pagedjs would otherwise render them too late in the process
const footer = syntaxHighlighter.$docinfo('footer', node, Opal.hash(attrs))
const matches = footer.match(this.linkStylesheet)
if (matches !== null) {
matches.forEach((element) => {
header = header + element
})
}
}
return header
}
syntaxHighlighterFooter (node, syntaxHighlighter, attrs) {
let footer = ''
if (syntaxHighlighter !== Opal.nil && syntaxHighlighter['$docinfo?']('footer')) {
// skip all link elements in the footer as they are re-ordered to the header by syntaxHighlighterHead()
footer = syntaxHighlighter.$docinfo('footer', node, Opal.hash(attrs))
footer = footer.replace(this.linkStylesheet, '')
}
return footer
}
assetUriScheme (node) {
let result = node.getAttribute('asset-uri-scheme', 'https')
if (result.trim() !== '') {
result = `${result}:`
}
return result
}
langAttr (node) {
const attrNolang = node.getAttribute('nolang')
if (attrNolang === '') {
return ''
}
const attrLang = node.getAttribute('lang', 'en')
return ` lang="${attrLang}"`
}
isSvgIconEnabled (node) {
return node.getDocument().isAttribute('icontype', 'svg') || node.getDocument().isAttribute('icons', 'font')
}
titlePage (node) {
if (node.getDocumentTitle()) {
const doc = node.getDocument()
if (this.hasTitlePage(doc)) {
return `<div id="cover" class="title-page front-matter">
<h1>${node.getDocumentTitle()}</h1>
<h2>${node.getDocument().getAuthor()}</h2>
</div>`
}
return `<div class="title-document">
<h1>${node.getDocumentTitle()}</h1>
</div>`
}
return ''
}
/**
* Generate an (hidden) outline otherwise Chrome won't generate "Dests" fields and we won't be able to generate a PDF outline.
*/
outline (node, opts) {
return `<div style="display: none;">${this.convert_outline(node, opts)}</div>`
}
tocHeader (node, opts) {
if (node.hasHeader()) {
const tocPlacement = node.getAttribute('toc-placement', 'auto')
// Add a toc in the header if the toc placement is auto (default), left or right
const hasTocPlacementHeader = tocPlacement === 'auto' || tocPlacement === 'left' || tocPlacement === 'right'
if (node.hasSections() && node.hasAttribute('toc') && (hasTocPlacementHeader || this.hasTitlePage(node))) {
return `<div id="toc" class="${node.getAttribute('toc-class', 'toc')}">
<div id="toctitle">${node.getAttribute('toc-title')}</div>
${this.convert_outline(node, opts)}
</div>`
}
}
return ''
}
}
const instance = new DocumentPDFConverter()
module.exports = DocumentPDFConverter
module.exports.templates = {
document: (node, opts) => instance.convert_document(node, opts),
convert_outline: (node, opts) => instance.convert_outline(node, opts),
admonition: node => instance.convert_admonition(node),
inline_callout: node => instance.convert_inline_callout(node),
inline_image: node => instance.convert_inline_image(node),
inline_footnote: node => instance.convert_inline_footnote(node),
colist: node => instance.convert_colist(node),
page_break: node => instance.convert_page_break(node),
preamble: node => instance.convert_preamble(node)
}