92 lines
2.2 KiB
JavaScript
92 lines
2.2 KiB
JavaScript
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"use strict";
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var _types = require("../tokenizer/types");
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var _index = require("./index");
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var _index2 = _interopRequireDefault(_index);
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var _whitespace = require("../util/whitespace");
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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var pp = _index2.default.prototype;
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// ## Parser utilities
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// TODO
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pp.addExtra = function (node, key, val) {
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if (!node) return;
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var extra = node.extra = node.extra || {};
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extra[key] = val;
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};
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// TODO
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pp.isRelational = function (op) {
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return this.match(_types.types.relational) && this.state.value === op;
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};
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// TODO
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pp.expectRelational = function (op) {
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if (this.isRelational(op)) {
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this.next();
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} else {
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this.unexpected();
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}
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};
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// Tests whether parsed token is a contextual keyword.
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pp.isContextual = function (name) {
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return this.match(_types.types.name) && this.state.value === name;
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};
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// Consumes contextual keyword if possible.
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pp.eatContextual = function (name) {
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return this.state.value === name && this.eat(_types.types.name);
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};
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// Asserts that following token is given contextual keyword.
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pp.expectContextual = function (name, message) {
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if (!this.eatContextual(name)) this.unexpected(null, message);
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};
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// Test whether a semicolon can be inserted at the current position.
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pp.canInsertSemicolon = function () {
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return this.match(_types.types.eof) || this.match(_types.types.braceR) || _whitespace.lineBreak.test(this.input.slice(this.state.lastTokEnd, this.state.start));
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};
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// TODO
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pp.isLineTerminator = function () {
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return this.eat(_types.types.semi) || this.canInsertSemicolon();
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};
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// Consume a semicolon, or, failing that, see if we are allowed to
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// pretend that there is a semicolon at this position.
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pp.semicolon = function () {
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if (!this.isLineTerminator()) this.unexpected();
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};
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// Expect a token of a given type. If found, consume it, otherwise,
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// raise an unexpected token error at given pos.
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pp.expect = function (type, pos) {
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return this.eat(type) || this.unexpected(pos);
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};
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// Raise an unexpected token error.
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pp.unexpected = function (pos) {
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var message = arguments.length <= 1 || arguments[1] === undefined ? "Unexpected token" : arguments[1];
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this.raise(pos != null ? pos : this.state.start, message);
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};
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