@emvu/react-scripts/node_modules/babylon/lib/parser/util.js

Fork of configuration and scripts for Create React App.

"use strict";

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };

var _types = require("../tokenizer/types");

var _index = require("./index");

var _index2 = _interopRequireDefault(_index);

var _whitespace = require("../util/whitespace");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var pp = _index2.default.prototype;

// ## Parser utilities

// TODO

pp.addExtra = function (node, key, val) {
  if (!node) return;

  var extra = node.extra = node.extra || {};
  extra[key] = val;
};

// TODO

pp.isRelational = function (op) {
  return this.match(_types.types.relational) && this.state.value === op;
};

// TODO

pp.expectRelational = function (op) {
  if (this.isRelational(op)) {
    this.next();
  } else {
    this.unexpected(null, _types.types.relational);
  }
};

// Tests whether parsed token is a contextual keyword.

pp.isContextual = function (name) {
  return this.match(_types.types.name) && this.state.value === name;
};

// Consumes contextual keyword if possible.

pp.eatContextual = function (name) {
  return this.state.value === name && this.eat(_types.types.name);
};

// Asserts that following token is given contextual keyword.

pp.expectContextual = function (name, message) {
  if (!this.eatContextual(name)) this.unexpected(null, message);
};

// Test whether a semicolon can be inserted at the current position.

pp.canInsertSemicolon = function () {
  return this.match(_types.types.eof) || this.match(_types.types.braceR) || _whitespace.lineBreak.test(this.input.slice(this.state.lastTokEnd, this.state.start));
};

// TODO

pp.isLineTerminator = function () {
  return this.eat(_types.types.semi) || this.canInsertSemicolon();
};

// Consume a semicolon, or, failing that, see if we are allowed to
// pretend that there is a semicolon at this position.

pp.semicolon = function () {
  if (!this.isLineTerminator()) this.unexpected(null, _types.types.semi);
};

// Expect a token of a given type. If found, consume it, otherwise,
// raise an unexpected token error at given pos.

pp.expect = function (type, pos) {
  return this.eat(type) || this.unexpected(pos, type);
};

// Raise an unexpected token error. Can take the expected token type
// instead of a message string.

pp.unexpected = function (pos) {
  var messageOrType = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : "Unexpected token";

  if (messageOrType && (typeof messageOrType === "undefined" ? "undefined" : _typeof(messageOrType)) === "object" && messageOrType.label) {
    messageOrType = "Unexpected token, expected " + messageOrType.label;
  }
  this.raise(pos != null ? pos : this.state.start, messageOrType);
};