Function next

src/expression/parse.js:264–266

* Get the next character from the expression. * The character is stored into the char c. If the end of the expression is * reached, the function puts an empty string in c. * @private

(state)

   * @private
   */
  function next (state) {
    state.index++
  }

  /**
   * Preview the previous character from the expression.