1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
"use strict";
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();
}
};
// 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();
};
// 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);
};
// Raise an unexpected token error.
pp.unexpected = function (pos) {
var message = arguments.length <= 1 || arguments[1] === undefined ? "Unexpected token" : arguments[1];
this.raise(pos != null ? pos : this.state.start, message);
};
|
