index.js

module.exports = {
  start: [
    {regex: / ?/, next: 'expression'}
  ],
  object: [
    {regex: / ?/, token: 'bracket', push: 'key'},
    {regex: ',', token: 'bracket', push: 'key'},
    {regex: '}', token: 'bracket', pop: true}
  ],
  array: [
    {regex: ',', token: 'bracket'},
    {regex: / ?/, push: 'value'},
    {regex: ']', token: 'bracket', pop: true}
  ],
  key: [
    {regex: /[a-z]\w*/i, token: 'keyword'},
    {regex: '"', token: 'string', push: 'string'},
    {regex: /\(/, token: 'variable-2', push: 'expression'},
    {regex: ':', token: 'bracket', push: 'value'}
  ],
  value: [
    {regex: /null|true|false/, token: 'atom'},
    {regex: /\d+/, token: 'number'},
    {regex: /\.\w+/, token: 'tag'},
    {regex: /\(/, token: 'variable-2', push: 'expression'},
    {regex: '"', token: 'string', push: 'string'},
    {regex: '{', token: 'bracket', push: 'object'},
    {regex: /\[/, token: 'bracket', push: 'array'},
    {regex: /[,}\]]/, token: 'bracket', pop: true}
  ],
  string: [
    {regex: /[^"\\]+/, token: 'string'},
    {regex: /\\\(/, token: 'variable-2', push: 'expression'},
    {regex: '"', token: 'string', pop: true}
  ],
  expression: [
    {regex: /\.\w+/, token: 'tag'},
    {regex: /\w+|==|!=|\|/, token: 'builtin'},
    {regex: /\(/, token: 'variable-2', push: 'expression'},
    {regex: /\)/, token: 'variable-2', pop: true},
    {regex: '{', token: 'bracket', push: 'object'},
    {regex: /\[/, token: 'bracket', push: 'array'}
  ]
}