antlr4ts
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ANTLR 4 runtime for JavaScript written in Typescript
82 lines • 4.01 kB
JavaScript
;
/*!
* Copyright 2016 The ANTLR Project. All rights reserved.
* Licensed under the BSD-3-Clause license. See LICENSE file in the project root for license information.
*/
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.BailErrorStrategy = void 0;
// ConvertTo-TS run at 2016-10-04T11:26:49.2855056-07:00
const DefaultErrorStrategy_1 = require("./DefaultErrorStrategy");
const InputMismatchException_1 = require("./InputMismatchException");
const Decorators_1 = require("./Decorators");
const ParseCancellationException_1 = require("./misc/ParseCancellationException");
/**
* This implementation of {@link ANTLRErrorStrategy} responds to syntax errors
* by immediately canceling the parse operation with a
* {@link ParseCancellationException}. The implementation ensures that the
* {@link ParserRuleContext#exception} field is set for all parse tree nodes
* that were not completed prior to encountering the error.
*
* This error strategy is useful in the following scenarios.
*
* * **Two-stage parsing:** This error strategy allows the first
* stage of two-stage parsing to immediately terminate if an error is
* encountered, and immediately fall back to the second stage. In addition to
* avoiding wasted work by attempting to recover from errors here, the empty
* implementation of {@link BailErrorStrategy#sync} improves the performance of
* the first stage.
* * **Silent validation:** When syntax errors are not being
* reported or logged, and the parse result is simply ignored if errors occur,
* the {@link BailErrorStrategy} avoids wasting work on recovering from errors
* when the result will be ignored either way.
*
* ```
* myparser.errorHandler = new BailErrorStrategy();
* ```
*
* @see Parser.errorHandler
*/
class BailErrorStrategy extends DefaultErrorStrategy_1.DefaultErrorStrategy {
/** Instead of recovering from exception `e`, re-throw it wrapped
* in a {@link ParseCancellationException} so it is not caught by the
* rule function catches. Use {@link Exception#getCause()} to get the
* original {@link RecognitionException}.
*/
recover(recognizer, e) {
for (let context = recognizer.context; context; context = context.parent) {
context.exception = e;
}
throw new ParseCancellationException_1.ParseCancellationException(e);
}
/** Make sure we don't attempt to recover inline; if the parser
* successfully recovers, it won't throw an exception.
*/
recoverInline(recognizer) {
let e = new InputMismatchException_1.InputMismatchException(recognizer);
for (let context = recognizer.context; context; context = context.parent) {
context.exception = e;
}
throw new ParseCancellationException_1.ParseCancellationException(e);
}
/** Make sure we don't attempt to recover from problems in subrules. */
sync(recognizer) {
// intentionally empty
}
}
__decorate([
Decorators_1.Override
], BailErrorStrategy.prototype, "recover", null);
__decorate([
Decorators_1.Override
], BailErrorStrategy.prototype, "recoverInline", null);
__decorate([
Decorators_1.Override
], BailErrorStrategy.prototype, "sync", null);
exports.BailErrorStrategy = BailErrorStrategy;
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