bfm.test.js

const fs = require('fs')
const path = require('path')
const vm = require('vm')
const CodeMirror = require('codemirror')

require('codemirror/addon/runmode/runmode')
require('codemirror/addon/mode/overlay')
require('codemirror/mode/meta')
require('codemirror/mode/xml/xml')
require('codemirror/mode/markdown/markdown')
require('codemirror/mode/yaml/yaml')
require('codemirror/mode/gfm/gfm')
require('codemirror/mode/yaml-frontmatter/yaml-frontmatter')

function loadBrowserScript(relativePath) {
  const filename = path.join(__dirname, '..', '..', relativePath)
  const code = fs.readFileSync(filename, 'utf8')

  vm.runInNewContext(
    code,
    {
      CodeMirror,
      console
    },
    { filename }
  )
}

loadBrowserScript('extra_scripts/codemirror/mode/bfm/bfm.js')

function runBfm(markdown) {
  const tokens = []

  CodeMirror.runMode(markdown, 'text/x-bfm', (token, style, line, start) => {
    if (token !== '\n') {
      tokens.push({ token, style, line, start })
    }
  })

  return tokens
}

function nonWhitespaceTokens(tokens, line, minStart) {
  return tokens.filter(
    token =>
      token.line === line && token.start >= minStart && token.token.trim()
  )
}

function expectTokensToUseStyle(tokens, style) {
  expect(tokens.length).toBeGreaterThan(0)
  tokens.forEach(token => {
    expect(token.style).toBe(style)
  })
}

it('styles the first definition-list bullet like following bullets', () => {
  const tokens = runBfm('Term\n: - first\n  - second\n')

  expectTokensToUseStyle(nonWhitespaceTokens(tokens, 1, 2), 'variable-2')
  expectTokensToUseStyle(nonWhitespaceTokens(tokens, 2, 2), 'variable-2')
})

it('does not style plain definition text as a list', () => {
  const tokens = runBfm('Term\n: plain definition\n')
  const definitionTokens = nonWhitespaceTokens(tokens, 1, 0)

  expect(definitionTokens.length).toBeGreaterThan(0)
  definitionTokens.forEach(token => {
    expect(token.style).not.toBe('variable-2')
  })
})