144 lines
4.3 KiB
JavaScript
144 lines
4.3 KiB
JavaScript
const zlib = require('zlib')
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// ------------------------------------
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// Markdown - Kroki Preprocessor
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// ------------------------------------
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module.exports = {
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init (mdinst, conf) {
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mdinst.use((md, opts) => {
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const openMarker = opts.openMarker || '```kroki'
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const openChar = openMarker.charCodeAt(0)
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const closeMarker = opts.closeMarker || '```'
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const closeChar = closeMarker.charCodeAt(0)
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const server = opts.server || 'https://kroki.io'
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md.block.ruler.before('fence', 'kroki', (state, startLine, endLine, silent) => {
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let nextLine
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let markup
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let params
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let token
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let i
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let autoClosed = false
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let start = state.bMarks[startLine] + state.tShift[startLine]
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let max = state.eMarks[startLine]
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// Check out the first character quickly,
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// this should filter out most of non-uml blocks
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//
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if (openChar !== state.src.charCodeAt(start)) { return false }
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// Check out the rest of the marker string
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//
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for (i = 0; i < openMarker.length; ++i) {
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if (openMarker[i] !== state.src[start + i]) { return false }
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}
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markup = state.src.slice(start, start + i)
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params = state.src.slice(start + i, max)
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// Since start is found, we can report success here in validation mode
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//
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if (silent) { return true }
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// Search for the end of the block
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//
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nextLine = startLine
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for (;;) {
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nextLine++
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if (nextLine >= endLine) {
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// unclosed block should be autoclosed by end of document.
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// also block seems to be autoclosed by end of parent
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break
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}
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start = state.bMarks[nextLine] + state.tShift[nextLine]
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max = state.eMarks[nextLine]
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if (start < max && state.sCount[nextLine] < state.blkIndent) {
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// non-empty line with negative indent should stop the list:
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// - ```
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// test
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break
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}
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if (closeChar !== state.src.charCodeAt(start)) {
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// didn't find the closing fence
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continue
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}
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if (state.sCount[nextLine] > state.sCount[startLine]) {
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// closing fence should not be indented with respect of opening fence
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continue
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}
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var closeMarkerMatched = true
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for (i = 0; i < closeMarker.length; ++i) {
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if (closeMarker[i] !== state.src[start + i]) {
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closeMarkerMatched = false
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break
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}
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}
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if (!closeMarkerMatched) {
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continue
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}
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// make sure tail has spaces only
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if (state.skipSpaces(start + i) < max) {
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continue
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}
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// found!
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autoClosed = true
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break
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}
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let contents = state.src
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.split('\n')
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.slice(startLine + 1, nextLine)
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.join('\n')
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// We generate a token list for the alt property, to mimic what the image parser does.
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let altToken = []
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// Remove leading space if any.
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let alt = params ? params.slice(1) : 'uml diagram'
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state.md.inline.parse(
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alt,
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state.md,
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state.env,
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altToken
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)
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let firstlf = contents.indexOf('\n')
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if (firstlf === -1) firstlf = undefined
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let diagramType = contents.substring(0, firstlf)
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contents = contents.substring(firstlf + 1)
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let result = zlib.deflateSync(contents).toString('base64').replace(/\+/g, '-').replace(/\//g, '_')
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token = state.push('kroki', 'img', 0)
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// alt is constructed from children. No point in populating it here.
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token.attrs = [ [ 'src', `${server}/${diagramType}/svg/${result}` ], [ 'alt', '' ], ['class', 'uml-diagram prefetch-candidate'] ]
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token.block = true
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token.children = altToken
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token.info = params
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token.map = [ startLine, nextLine ]
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token.markup = markup
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state.line = nextLine + (autoClosed ? 1 : 0)
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return true
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}, {
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alt: [ 'paragraph', 'reference', 'blockquote', 'list' ]
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})
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md.renderer.rules.kroki = md.renderer.rules.image
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}, {
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openMarker: conf.openMarker,
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closeMarker: conf.closeMarker,
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server: conf.server
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})
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}
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}
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