const root = options.root || path.join(process.cwd(), '../')

md.core.ruler.after('block', 'extract-code', function parser(state) {

let tokens = state.tokens,

tok, i;

// modify html_block

for (i = 0; i < tokens.length; i++) {

tok = tokens[i];

if (tok.type === 'html_block' && isDemoBlock(tok)) {

const handledTokens = getHandledTokens(tok)

if (handledTokens.length) {

tokens.splice(i, 1, ...handledTokens)

i += handledTokens.length - 1

}

}

}

function isDemoBlock(token) {

let content = token.content

let regex = /<\/demo>$/

return regex.test(content.trim())

}

function getHandledTokens(htmlToken, toks) {

const tokens = toks || []

let content = htmlToken.content

let reg = /<<<(.*)(\?.*)?\b/

let matched = content.match(reg)

if (!matched) {

return tokens

}

tokens.length && tokens.pop()

const contentBefore = content.substr(0, matched.index)

const contentAfter = content.substr(matched.index + matched[0].length)

let token = createToken('html_block', '', 0)

token.content = contentBefore

tokens.push(token)

token = createToken('fence', 'code', 0)

const rawPath = matched[1].trim().replace(/^@/, root)

const filename = rawPath.split(/\?/).shift()

const partName = rawPath.replace(filename, '').substr(1)

token.info = filename.split('.').pop()

content = fs.existsSync(filename) ? fs.readFileSync(filename).toString() : 'Not found: ' + filename

if (partName) {

const partReg = new RegExp(`<${partName}[\\s\\S]*</${partName}>`)

const matched = content.match(partReg)

if (matched) {

content = matched[0]

}

// highlight stylus

if (partName === 'style') {

token.info = "styl"

}

}

token.content = content

token.markup = '```'

tokens.push(token)

token = createToken('html_block', '', 0)

token.content = contentAfter

tokens.push(token)

return getHandledTokens(token, tokens)

}

function createToken(type, tag, nesting) {

let token = new state.Token(type, tag, nesting);

token.block = true;

if (nesting < 0) { this.level--; }

token.level = this.level;

if (nesting > 0) { this.level++; }

return token;

}

})