sexp-template/test/parser.js

const test = require('tape')

const Lexer = require('../src/lexer')
const Node = require('../src/node')
const Parser = require('../src/parser')
const tt = require('../src/tokenTypes')

test('parses token stream into a tree', t => {
  t.plan(1)
  const lexer = new Lexer()
  let tokenStream = lexer.scan(`
    (div :class "foobar"
      (p :class "bazquux"))
  `)
  let parser = new Parser(tokenStream)
  let tree = parser.parse()

  t.deepEqual(tree, [
    new Node({
      type: 'functionCall',
      functionName: 'div',
      args: [
        new Node({
          attributeName: 'class',
          attributeValue: new Node({ type: 'string', content: 'foobar' }),
        }),
      ],
      subtree: [
        new Node({
          type: 'functionCall',
          functionName: 'p',
          args: [
            new Node({
              attributeName: 'class',
              attributeValue: new Node({ type: 'string', content: 'bazquux' }),
            }),
          ],
          subtree: [],
        }),
      ],
    }),
  ])
})

test('missing close paren returns an error', function(t) {
  t.plan(2)
  const lexer = new Lexer()
  let tokenStream = lexer.scan(`
    (div :class "foobar"
  `)
  let parser = new Parser(tokenStream)
  let tree = parser.parse()
  t.equal(tree.error.constructor.name, 'Error')
  t.deepEqual(tree.error, {
    file: undefined,
    line: 3,
    message: 'Encountered an unexpected EOF while looking for a ).',
  })
})

test('unexpected attribute return an error', function(t) {
  t.plan(2)
  const lexer = new Lexer()
  let tokenStream = lexer.scan(`
    (div :class :id)
  `)
  let parser = new Parser(tokenStream)
  let tree = parser.parse()
  t.equal(tree.error.constructor.name, 'Error')
  t.deepEqual(tree.error, {
    file: undefined,
    line: 2,
    message: 'Encountered an unexpected attribute while looking for a string or identifier.',
  })
})