const zlib = require('zlib') // ------------------------------------ // Markdown - PlantUML Preprocessor // ------------------------------------ module.exports = { init (mdinst, conf) { mdinst.use((md, opts) => { const openMarker = opts.openMarker || '```plantuml' const openChar = openMarker.charCodeAt(0) const closeMarker = opts.closeMarker || '```' const closeChar = closeMarker.charCodeAt(0) const imageFormat = opts.imageFormat || 'svg' const server = opts.server || 'https://plantuml.requarks.io' md.block.ruler.before('fence', 'uml_diagram', (state, startLine, endLine, silent) => { let nextLine let markup let params let token let i let autoClosed = false let start = state.bMarks[startLine] + state.tShift[startLine] let max = state.eMarks[startLine] // Check out the first character quickly, // this should filter out most of non-uml blocks // if (openChar !== state.src.charCodeAt(start)) { return false } // Check out the rest of the marker string // for (i = 0; i < openMarker.length; ++i) { if (openMarker[i] !== state.src[start + i]) { return false } } markup = state.src.slice(start, start + i) params = state.src.slice(start + i, max) // Since start is found, we can report success here in validation mode // if (silent) { return true } // Search for the end of the block // nextLine = startLine for (;;) { nextLine++ if (nextLine >= endLine) { // unclosed block should be autoclosed by end of document. // also block seems to be autoclosed by end of parent break } start = state.bMarks[nextLine] + state.tShift[nextLine] max = state.eMarks[nextLine] if (start < max && state.sCount[nextLine] < state.blkIndent) { // non-empty line with negative indent should stop the list: // - ``` // test break } if (closeChar !== state.src.charCodeAt(start)) { // didn't find the closing fence continue } if (state.sCount[nextLine] > state.sCount[startLine]) { // closing fence should not be indented with respect of opening fence continue } const i = closeMarker.findIndex(item => item !== state.src[start + i]) const closeMarkerMatched = i !== -1 if (!closeMarkerMatched) { continue } // make sure tail has spaces only if (state.skipSpaces(start + i) < max) { continue } // found! autoClosed = true break } const contents = state.src .split('\n') .slice(startLine + 1, nextLine) .join('\n') // We generate a token list for the alt property, to mimic what the image parser does. let altToken = [] // Remove leading space if any. let alt = params ? params.slice(1) : 'uml diagram' state.md.inline.parse( alt, state.md, state.env, altToken ) const zippedCode = encode64(zlib.deflateRawSync('@startuml\n' + contents + '\n@enduml').toString('binary')) token = state.push('uml_diagram', 'img', 0) // alt is constructed from children. No point in populating it here. token.attrs = [ [ 'src', `${server}/${imageFormat}/${zippedCode}` ], [ 'alt', '' ], ['class', 'uml-diagram prefetch-candidate'] ] token.block = true token.children = altToken token.info = params token.map = [ startLine, nextLine ] token.markup = markup state.line = nextLine + (autoClosed ? 1 : 0) return true }, { alt: [ 'paragraph', 'reference', 'blockquote', 'list' ] }) md.renderer.rules.uml_diagram = md.renderer.rules.image }, { openMarker: conf.openMarker, closeMarker: conf.closeMarker, imageFormat: conf.imageFormat, server: conf.server }) } } function encode64 (data) { let r = '' for (let i = 0; i < data.length; i += 3) { if (i + 2 === data.length) { r += append3bytes(data.charCodeAt(i), data.charCodeAt(i + 1), 0) } else if (i + 1 === data.length) { r += append3bytes(data.charCodeAt(i), 0, 0) } else { r += append3bytes(data.charCodeAt(i), data.charCodeAt(i + 1), data.charCodeAt(i + 2)) } } return r } function append3bytes (b1, b2, b3) { let c1 = b1 >> 2 let c2 = ((b1 & 0x3) << 4) | (b2 >> 4) let c3 = ((b2 & 0xF) << 2) | (b3 >> 6) let c4 = b3 & 0x3F let r = '' r += encode6bit(c1 & 0x3F) r += encode6bit(c2 & 0x3F) r += encode6bit(c3 & 0x3F) r += encode6bit(c4 & 0x3F) return r } function encode6bit(raw) { let b = raw if (b < 10) { return String.fromCharCode(48 + b) } b -= 10 if (b < 26) { return String.fromCharCode(65 + b) } b -= 26 if (b < 26) { return String.fromCharCode(97 + b) } b -= 26 if (b === 0) { return '-' } if (b === 1) { return '_' } return '?' }