meta.js

'use strict'

const YAML = require('js-yaml')

module.exports = function (md) {
  return meta.bind(null, md)
}

function get(state, line) {
  const pos = state.bMarks[line]
  const max = state.eMarks[line]
  return state.src.substr(pos, max - pos)
}

function meta(md, state, start, end, silent) {
  if (start !== 0 || state.blkIndent !== 0) {
    return false
  }
  if (state.tShift[start] < 0) {
    return false
  }
  if (!get(state, start).match(/^---$/)) {
    return false
  }
  const data = []
  let line = start
  while (line < end) {
    line++
    const str = get(state, line)
    if (str.match(/^---$/)) {
      break
    }
    if (state.tShift[line] < 0) {
      break
    }
    data.push(str)
  }

  // if (line >= end) {
  //   return false
  // }

  md.meta = YAML.safeLoad(data.join('\n'), {json: true}) || {}
  state.line = line + 1
  return true
}