85 lines
2.4 KiB
JavaScript
85 lines
2.4 KiB
JavaScript
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"use strict";
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const GrammarError = require("../grammar-error");
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class Defaults {
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constructor(options) {
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options = typeof options !== "undefined" ? options : {};
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if (typeof options.error === "function") { this.error = options.error; }
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if (typeof options.warning === "function") { this.warning = options.warning; }
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if (typeof options.info === "function") { this.info = options.info; }
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}
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// eslint-disable-next-line class-methods-use-this -- Abstract
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error() {
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// Intentionally empty placeholder
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}
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// eslint-disable-next-line class-methods-use-this -- Abstract
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warning() {
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// Intentionally empty placeholder
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}
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// eslint-disable-next-line class-methods-use-this -- Abstract
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info() {
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// Intentionally empty placeholder
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}
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}
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class Session {
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constructor(options) {
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this._callbacks = new Defaults(options);
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this._firstError = null;
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this.errors = 0;
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/** @type {import("../peg").Problem[]} */
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this.problems = [];
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/** @type {import("../peg").Stage} */
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this.stage = null;
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}
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error(...args) {
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++this.errors;
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// In order to preserve backward compatibility we cannot change `GrammarError`
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// constructor, nor throw another class of error:
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// - if we change `GrammarError` constructor, this will break plugins that
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// throws `GrammarError`
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// - if we throw another Error class, this will break parser clients that
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// catches GrammarError
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//
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// So we use a compromise: we throw an `GrammarError` with all found problems
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// in the `problems` property, but the thrown error itself is the first
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// registered error.
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//
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// Thus when the old client catches the error it can find all properties on
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// the Grammar error that it want. On the other hand the new client can
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// inspect the `problems` property to get all problems.
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if (this._firstError === null) {
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this._firstError = new GrammarError(...args);
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this._firstError.stage = this.stage;
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this._firstError.problems = this.problems;
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}
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this.problems.push(["error", ...args]);
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this._callbacks.error(this.stage, ...args);
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}
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warning(...args) {
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this.problems.push(["warning", ...args]);
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this._callbacks.warning(this.stage, ...args);
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}
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info(...args) {
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this.problems.push(["info", ...args]);
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this._callbacks.info(this.stage, ...args);
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}
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checkErrors() {
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if (this.errors !== 0) {
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throw this._firstError;
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}
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}
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}
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module.exports = Session;
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