6773279039
* chore(package): update eslint-config-babel to version 4.0.0 https://greenkeeper.io/ * Fix prefer-const * Update package.json
89 lines
2.2 KiB
JavaScript
89 lines
2.2 KiB
JavaScript
import { types as tt } from "../tokenizer/types";
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import Parser from "./index";
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import { lineBreak } from "../util/whitespace";
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const pp = Parser.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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const 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(tt.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(null, tt.relational);
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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(tt.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(tt.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(tt.eof) ||
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this.match(tt.braceR) ||
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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(tt.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(null, tt.semi);
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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, type);
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};
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// Raise an unexpected token error. Can take the expected token type
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// instead of a message string.
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pp.unexpected = function (pos, messageOrType = "Unexpected token") {
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if (messageOrType && typeof messageOrType === "object" && messageOrType.label) {
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messageOrType = `Unexpected token, expected ${messageOrType.label}`;
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}
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this.raise(pos != null ? pos : this.state.start, messageOrType);
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};
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