antlr4ts
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ANTLR 4 runtime for JavaScript written in Typescript
128 lines • 4.87 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;
};
var __param = (this && this.__param) || function (paramIndex, decorator) {
return function (target, key) { decorator(target, key, paramIndex); }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.LexerCustomAction = void 0;
const MurmurHash_1 = require("../misc/MurmurHash");
const Decorators_1 = require("../Decorators");
/**
* Executes a custom lexer action by calling {@link Recognizer#action} with the
* rule and action indexes assigned to the custom action. The implementation of
* a custom action is added to the generated code for the lexer in an override
* of {@link Recognizer#action} when the grammar is compiled.
*
* This class may represent embedded actions created with the `{...}`
* syntax in ANTLR 4, as well as actions created for lexer commands where the
* command argument could not be evaluated when the grammar was compiled.
*
* @author Sam Harwell
* @since 4.2
*/
class LexerCustomAction {
/**
* Constructs a custom lexer action with the specified rule and action
* indexes.
*
* @param ruleIndex The rule index to use for calls to
* {@link Recognizer#action}.
* @param actionIndex The action index to use for calls to
* {@link Recognizer#action}.
*/
constructor(ruleIndex, actionIndex) {
this._ruleIndex = ruleIndex;
this._actionIndex = actionIndex;
}
/**
* Gets the rule index to use for calls to {@link Recognizer#action}.
*
* @returns The rule index for the custom action.
*/
get ruleIndex() {
return this._ruleIndex;
}
/**
* Gets the action index to use for calls to {@link Recognizer#action}.
*
* @returns The action index for the custom action.
*/
get actionIndex() {
return this._actionIndex;
}
/**
* {@inheritDoc}
*
* @returns This method returns {@link LexerActionType#CUSTOM}.
*/
get actionType() {
return 1 /* CUSTOM */;
}
/**
* Gets whether the lexer action is position-dependent. Position-dependent
* actions may have different semantics depending on the {@link CharStream}
* index at the time the action is executed.
*
* Custom actions are position-dependent since they may represent a
* user-defined embedded action which makes calls to methods like
* {@link Lexer#getText}.
*
* @returns This method returns `true`.
*/
get isPositionDependent() {
return true;
}
/**
* {@inheritDoc}
*
* Custom actions are implemented by calling {@link Lexer#action} with the
* appropriate rule and action indexes.
*/
execute(lexer) {
lexer.action(undefined, this._ruleIndex, this._actionIndex);
}
hashCode() {
let hash = MurmurHash_1.MurmurHash.initialize();
hash = MurmurHash_1.MurmurHash.update(hash, this.actionType);
hash = MurmurHash_1.MurmurHash.update(hash, this._ruleIndex);
hash = MurmurHash_1.MurmurHash.update(hash, this._actionIndex);
return MurmurHash_1.MurmurHash.finish(hash, 3);
}
equals(obj) {
if (obj === this) {
return true;
}
else if (!(obj instanceof LexerCustomAction)) {
return false;
}
return this._ruleIndex === obj._ruleIndex
&& this._actionIndex === obj._actionIndex;
}
}
__decorate([
Decorators_1.Override
], LexerCustomAction.prototype, "actionType", null);
__decorate([
Decorators_1.Override
], LexerCustomAction.prototype, "isPositionDependent", null);
__decorate([
Decorators_1.Override,
__param(0, Decorators_1.NotNull)
], LexerCustomAction.prototype, "execute", null);
__decorate([
Decorators_1.Override
], LexerCustomAction.prototype, "hashCode", null);
__decorate([
Decorators_1.Override
], LexerCustomAction.prototype, "equals", null);
exports.LexerCustomAction = LexerCustomAction;
//# sourceMappingURL=LexerCustomAction.js.map