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fix gfm header link generation with respect to deduplicatedHeaderId

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Signed-off-by: hoijui <hoijui.quaero@gmail.com>
This commit is contained in:
hoijui 2019-10-29 09:58:59 +01:00
parent cfa2ec38c5
commit 3be40b23d1
1 changed files with 69 additions and 19 deletions
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88
public/js/extra.js
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@ -825,6 +825,37 @@ const anchorForId = id => {
return anchor
}
const createHeaderId = (headerContent, headerIds = null) => {
// to escape characters not allow in css and humanize
const slug = slugifyWithUTF8(headerContent)
let id
if (window.linkifyHeaderStyle === 'keep-case') {
id = slug
} else if (window.linkifyHeaderStyle === 'lower-case') {
// to make compatible with GitHub, GitLab, Pandoc and many more
id = slug.toLowerCase()
} else if (window.linkifyHeaderStyle === 'gfm') {
// see GitHub implementation reference:
// https://gist.github.com/asabaylus/3071099#gistcomment-1593627
// it works like 'lower-case', but ...
const id_base = slug.toLowerCase()
id = id_base
if (headerIds !== null) {
// ... making sure the id is unique
let i = 1
while (headerIds.has(id)) {
id = id_base + '-' + i
i++
}
headerIds.add(id)
}
} else {
throw new Error('Unknown linkifyHeaderStyle value "' + window.linkifyHeaderStyle + '"')
}
return id
}
const linkifyAnchors = (level, containingElement) => {
const headers = containingElement.getElementsByTagName(`h${level}`)
@ -832,13 +863,7 @@ const linkifyAnchors = (level, containingElement) => {
let header = headers[i]
if (header.getElementsByClassName('anchor').length === 0) {
if (typeof header.id === 'undefined' || header.id === '') {
// to escape characters not allow in css and humanize
let id = slugifyWithUTF8(getHeaderContent(header))
// to make compatible with GitHub, GitLab, Pandoc and many more
if (window.linkifyHeaderStyle !== 'keep-case') {
id = id.toLowerCase()
}
header.id = id
header.id = createHeaderId(getHeaderContent(header))
}
if (!(typeof header.id === 'undefined' || header.id === '')) {
header.insertBefore(anchorForId(header.id), header.firstChild)
@ -864,20 +889,45 @@ function getHeaderContent (header) {
return headerHTML[0].innerHTML
}
function changeHeaderId ($header, id, newId) {
$header.attr('id', newId)
const $headerLink = $header.find(`> a.anchor[href="#${id}"]`)
$headerLink.attr('href', `#${newId}`)
$headerLink.attr('title', newId)
}
export function deduplicatedHeaderId (view) {
// headers contained in the last change
const headers = view.find(':header.raw').removeClass('raw').toArray()
for (let i = 0; i < headers.length; i++) {
const id = $(headers[i]).attr('id')
if (!id) continue
const duplicatedHeaders = view.find(`:header[id="${id}"]`).toArray()
for (let j = 0; j < duplicatedHeaders.length; j++) {
if (duplicatedHeaders[j] !== headers[i]) {
const newId = id + j
const $duplicatedHeader = $(duplicatedHeaders[j])
$duplicatedHeader.attr('id', newId)
const $headerLink = $duplicatedHeader.find(`> a.anchor[href="#${id}"]`)
$headerLink.attr('href', `#${newId}`)
$headerLink.attr('title', newId)
if (headers.length == 0) {
return;
}
if (window.linkifyHeaderStyle === 'gfm') {
// consistent with GitHub, GitLab, Pandoc & co.
// all headers contained in the document, in order of appearance
const allHeaders = view.find(`:header`).toArray()
// list of finaly assigned header IDs
let headerIds = new Set()
for (let j = 0; j < allHeaders.length; j++) {
const $header = $(allHeaders[j])
const id = $header.attr('id')
const newId = createHeaderId(getHeaderContent($header), headerIds)
changeHeaderId($header, id, newId)
}
} else {
// the legacy way
for (let i = 0; i < headers.length; i++) {
const id = $(headers[i]).attr('id')
if (!id) continue
const duplicatedHeaders = view.find(`:header[id="${id}"]`).toArray()
for (let j = 0; j < duplicatedHeaders.length; j++) {
if (duplicatedHeaders[j] !== headers[i]) {
const newId = id + j
const $header = $(duplicatedHeaders[j])
changeHeaderId($header, id, newId)
}
}
}
}