refactored SemanticContext.js.js to use es6 classes
use const/let for better scoping use object destructuring use jsdoc
This commit is contained in:
Camilo Roca
parent
21538ebb59
commit
6ebe0d1317
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@ -1,404 +1,400 @@
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//
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/* Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
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* Use of this file is governed by the BSD 3-clause license that
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* can be found in the LICENSE.txt file in the project root.
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*/
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//
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// A tree structure used to record the semantic context in which
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// an ATN configuration is valid. It's either a single predicate,
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// a conjunction {@code p1&&p2}, or a sum of products {@code p1||p2}.
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//
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// <p>I have scoped the {@link AND}, {@link OR}, and {@link Predicate} subclasses of
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// {@link SemanticContext} within the scope of this outer class.</p>
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//
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const {Set, Hash} = require('./../Utils');
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var Set = require('./../Utils').Set;
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var Hash = require('./../Utils').Hash;
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/**
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* A tree structure used to record the semantic context in which
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* an ATN configuration is valid. It's either a single predicate,
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* a conjunction {@code p1&&p2}, or a sum of products {@code p1||p2}.
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*
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* <p>I have scoped the {@link AND}, {@link OR}, and {@link Predicate} subclasses of
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* {@link SemanticContext} within the scope of this outer class.</p>
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*/
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class SemanticContext {
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hashCode() {
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const hash = new Hash();
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this.updateHashCode(hash);
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return hash.finish();
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}
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function SemanticContext() {
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return this;
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/**
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* For context independent predicates, we evaluate them without a local
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* context (i.e., null context). That way, we can evaluate them without
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* having to create proper rule-specific context during prediction (as
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* opposed to the parser, which creates them naturally). In a practical
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* sense, this avoids a cast exception from RuleContext to myruleContext.
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*
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* <p>For context dependent predicates, we must pass in a local context so that
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* references such as $arg evaluate properly as _localctx.arg. We only
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* capture context dependent predicates in the context in which we begin
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* prediction, so we passed in the outer context here in case of context
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* dependent predicate evaluation.</p>
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*/
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evaluate(parser, outerContext) {}
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/**
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* Evaluate the precedence predicates for the context and reduce the result.
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*
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* @param parser The parser instance.
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* @param outerContext The current parser context object.
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* @return The simplified semantic context after precedence predicates are
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* evaluated, which will be one of the following values.
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* <ul>
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* <li>{@link //NONE}: if the predicate simplifies to {@code true} after
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* precedence predicates are evaluated.</li>
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* <li>{@code null}: if the predicate simplifies to {@code false} after
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* precedence predicates are evaluated.</li>
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* <li>{@code this}: if the semantic context is not changed as a result of
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* precedence predicate evaluation.</li>
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* <li>A non-{@code null} {@link SemanticContext}: the new simplified
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* semantic context after precedence predicates are evaluated.</li>
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* </ul>
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*/
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evalPrecedence(parser, outerContext) {
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return this;
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}
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static andContext(a, b) {
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if (a === null || a === SemanticContext.NONE) {
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return b;
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}
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if (b === null || b === SemanticContext.NONE) {
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return a;
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}
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const result = new AND(a, b);
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if (result.opnds.length === 1) {
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return result.opnds[0];
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} else {
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return result;
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}
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}
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static orContext(a, b) {
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if (a === null) {
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return b;
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}
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if (b === null) {
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return a;
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}
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if (a === SemanticContext.NONE || b === SemanticContext.NONE) {
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return SemanticContext.NONE;
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}
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const result = new OR(a, b);
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if (result.opnds.length === 1) {
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return result.opnds[0];
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} else {
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return result;
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}
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}
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}
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SemanticContext.prototype.hashCode = function() {
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var hash = new Hash();
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this.updateHashCode(hash);
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return hash.finish();
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};
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// For context independent predicates, we evaluate them without a local
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// context (i.e., null context). That way, we can evaluate them without
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// having to create proper rule-specific context during prediction (as
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// opposed to the parser, which creates them naturally). In a practical
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// sense, this avoids a cast exception from RuleContext to myruleContext.
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//
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// <p>For context dependent predicates, we must pass in a local context so that
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// references such as $arg evaluate properly as _localctx.arg. We only
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// capture context dependent predicates in the context in which we begin
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// prediction, so we passed in the outer context here in case of context
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// dependent predicate evaluation.</p>
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//
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SemanticContext.prototype.evaluate = function(parser, outerContext) {
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};
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class Predicate extends SemanticContext {
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constructor(ruleIndex, predIndex, isCtxDependent) {
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super();
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this.ruleIndex = ruleIndex === undefined ? -1 : ruleIndex;
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this.predIndex = predIndex === undefined ? -1 : predIndex;
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this.isCtxDependent = isCtxDependent === undefined ? false : isCtxDependent; // e.g., $i ref in pred
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return this;
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}
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//
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// Evaluate the precedence predicates for the context and reduce the result.
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//
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// @param parser The parser instance.
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// @param outerContext The current parser context object.
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// @return The simplified semantic context after precedence predicates are
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// evaluated, which will be one of the following values.
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// <ul>
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// <li>{@link //NONE}: if the predicate simplifies to {@code true} after
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// precedence predicates are evaluated.</li>
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// <li>{@code null}: if the predicate simplifies to {@code false} after
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// precedence predicates are evaluated.</li>
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// <li>{@code this}: if the semantic context is not changed as a result of
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// precedence predicate evaluation.</li>
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// <li>A non-{@code null} {@link SemanticContext}: the new simplified
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// semantic context after precedence predicates are evaluated.</li>
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// </ul>
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//
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SemanticContext.prototype.evalPrecedence = function(parser, outerContext) {
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return this;
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};
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evaluate(parser, outerContext) {
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const localctx = this.isCtxDependent ? outerContext : null;
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return parser.sempred(localctx, this.ruleIndex, this.predIndex);
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}
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SemanticContext.andContext = function(a, b) {
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if (a === null || a === SemanticContext.NONE) {
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return b;
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updateHashCode(hash) {
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hash.update(this.ruleIndex, this.predIndex, this.isCtxDependent);
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}
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if (b === null || b === SemanticContext.NONE) {
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return a;
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}
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var result = new AND(a, b);
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if (result.opnds.length === 1) {
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return result.opnds[0];
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} else {
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return result;
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}
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};
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SemanticContext.orContext = function(a, b) {
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if (a === null) {
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return b;
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equals(other) {
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if (this === other) {
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return true;
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} else if (!(other instanceof Predicate)) {
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return false;
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} else {
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return this.ruleIndex === other.ruleIndex &&
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this.predIndex === other.predIndex &&
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this.isCtxDependent === other.isCtxDependent;
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}
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}
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if (b === null) {
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return a;
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}
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if (a === SemanticContext.NONE || b === SemanticContext.NONE) {
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return SemanticContext.NONE;
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}
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var result = new OR(a, b);
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if (result.opnds.length === 1) {
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return result.opnds[0];
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} else {
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return result;
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}
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};
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function Predicate(ruleIndex, predIndex, isCtxDependent) {
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SemanticContext.call(this);
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this.ruleIndex = ruleIndex === undefined ? -1 : ruleIndex;
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this.predIndex = predIndex === undefined ? -1 : predIndex;
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this.isCtxDependent = isCtxDependent === undefined ? false : isCtxDependent; // e.g., $i ref in pred
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return this;
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toString() {
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return "{" + this.ruleIndex + ":" + this.predIndex + "}?";
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}
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}
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Predicate.prototype = Object.create(SemanticContext.prototype);
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Predicate.prototype.constructor = Predicate;
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//The default {@link SemanticContext}, which is semantically equivalent to
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//a predicate of the form {@code {true}?}.
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//
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/**
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* The default {@link SemanticContext}, which is semantically equivalent to
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* a predicate of the form {@code {true}?}
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*/
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SemanticContext.NONE = new Predicate();
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Predicate.prototype.evaluate = function(parser, outerContext) {
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var localctx = this.isCtxDependent ? outerContext : null;
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return parser.sempred(localctx, this.ruleIndex, this.predIndex);
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};
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Predicate.prototype.updateHashCode = function(hash) {
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hash.update(this.ruleIndex, this.predIndex, this.isCtxDependent);
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};
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Predicate.prototype.equals = function(other) {
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if (this === other) {
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return true;
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} else if (!(other instanceof Predicate)) {
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return false;
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} else {
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return this.ruleIndex === other.ruleIndex &&
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this.predIndex === other.predIndex &&
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this.isCtxDependent === other.isCtxDependent;
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class PrecedencePredicate extends SemanticContext {
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constructor(precedence) {
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super();
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this.precedence = precedence === undefined ? 0 : precedence;
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}
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};
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Predicate.prototype.toString = function() {
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return "{" + this.ruleIndex + ":" + this.predIndex + "}?";
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};
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function PrecedencePredicate(precedence) {
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SemanticContext.call(this);
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this.precedence = precedence === undefined ? 0 : precedence;
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}
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PrecedencePredicate.prototype = Object.create(SemanticContext.prototype);
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PrecedencePredicate.prototype.constructor = PrecedencePredicate;
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PrecedencePredicate.prototype.evaluate = function(parser, outerContext) {
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return parser.precpred(outerContext, this.precedence);
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};
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PrecedencePredicate.prototype.evalPrecedence = function(parser, outerContext) {
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if (parser.precpred(outerContext, this.precedence)) {
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return SemanticContext.NONE;
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} else {
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return null;
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evaluate(parser, outerContext) {
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return parser.precpred(outerContext, this.precedence);
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}
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};
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PrecedencePredicate.prototype.compareTo = function(other) {
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return this.precedence - other.precedence;
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};
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PrecedencePredicate.prototype.updateHashCode = function(hash) {
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hash.update(31);
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};
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PrecedencePredicate.prototype.equals = function(other) {
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if (this === other) {
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return true;
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} else if (!(other instanceof PrecedencePredicate)) {
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return false;
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} else {
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return this.precedence === other.precedence;
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}
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};
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PrecedencePredicate.prototype.toString = function() {
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return "{"+this.precedence+">=prec}?";
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};
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PrecedencePredicate.filterPrecedencePredicates = function(set) {
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var result = [];
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set.values().map( function(context) {
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if (context instanceof PrecedencePredicate) {
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result.push(context);
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evalPrecedence(parser, outerContext) {
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if (parser.precpred(outerContext, this.precedence)) {
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return SemanticContext.NONE;
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} else {
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return null;
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}
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});
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return result;
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};
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// A semantic context which is true whenever none of the contained contexts
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// is false.
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//
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function AND(a, b) {
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SemanticContext.call(this);
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var operands = new Set();
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if (a instanceof AND) {
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a.opnds.map(function(o) {
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operands.add(o);
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});
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} else {
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operands.add(a);
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}
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if (b instanceof AND) {
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b.opnds.map(function(o) {
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operands.add(o);
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});
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} else {
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operands.add(b);
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compareTo(other) {
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return this.precedence - other.precedence;
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}
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var precedencePredicates = PrecedencePredicate.filterPrecedencePredicates(operands);
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if (precedencePredicates.length > 0) {
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// interested in the transition with the lowest precedence
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var reduced = null;
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precedencePredicates.map( function(p) {
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if(reduced===null || p.precedence<reduced.precedence) {
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reduced = p;
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updateHashCode(hash) {
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hash.update(31);
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}
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equals(other) {
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if (this === other) {
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return true;
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} else if (!(other instanceof PrecedencePredicate)) {
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return false;
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} else {
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return this.precedence === other.precedence;
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}
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}
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toString() {
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return "{"+this.precedence+">=prec}?";
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}
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static filterPrecedencePredicates(set) {
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const result = [];
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set.values().map( function(context) {
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if (context instanceof PrecedencePredicate) {
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result.push(context);
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}
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});
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operands.add(reduced);
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return result;
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}
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this.opnds = operands.values();
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return this;
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}
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AND.prototype = Object.create(SemanticContext.prototype);
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AND.prototype.constructor = AND;
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AND.prototype.equals = function(other) {
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if (this === other) {
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return true;
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} else if (!(other instanceof AND)) {
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return false;
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} else {
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return this.opnds === other.opnds;
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}
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};
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AND.prototype.updateHashCode = function(hash) {
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hash.update(this.opnds, "AND");
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};
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//
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// {@inheritDoc}
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//
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// <p>
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// The evaluation of predicates by this context is short-circuiting, but
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// unordered.</p>
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//
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AND.prototype.evaluate = function(parser, outerContext) {
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for (var i = 0; i < this.opnds.length; i++) {
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if (!this.opnds[i].evaluate(parser, outerContext)) {
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return false;
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class AND extends SemanticContext {
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/**
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* A semantic context which is true whenever none of the contained contexts
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* is false
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*/
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constructor(a, b) {
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super();
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const operands = new Set();
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if (a instanceof AND) {
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a.opnds.map(function(o) {
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operands.add(o);
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});
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} else {
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operands.add(a);
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}
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}
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return true;
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};
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AND.prototype.evalPrecedence = function(parser, outerContext) {
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var differs = false;
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var operands = [];
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for (var i = 0; i < this.opnds.length; i++) {
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var context = this.opnds[i];
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var evaluated = context.evalPrecedence(parser, outerContext);
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differs |= (evaluated !== context);
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if (evaluated === null) {
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// The AND context is false if any element is false
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return null;
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} else if (evaluated !== SemanticContext.NONE) {
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// Reduce the result by skipping true elements
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operands.push(evaluated);
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if (b instanceof AND) {
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b.opnds.map(function(o) {
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operands.add(o);
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});
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} else {
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operands.add(b);
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}
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}
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if (!differs) {
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const precedencePredicates = PrecedencePredicate.filterPrecedencePredicates(operands);
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if (precedencePredicates.length > 0) {
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// interested in the transition with the lowest precedence
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let reduced = null;
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precedencePredicates.map( function(p) {
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if(reduced===null || p.precedence<reduced.precedence) {
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reduced = p;
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}
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});
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operands.add(reduced);
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}
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this.opnds = operands.values();
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return this;
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}
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if (operands.length === 0) {
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// all elements were true, so the AND context is true
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return SemanticContext.NONE;
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}
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var result = null;
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operands.map(function(o) {
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result = result === null ? o : SemanticContext.andContext(result, o);
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});
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return result;
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};
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AND.prototype.toString = function() {
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var s = "";
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this.opnds.map(function(o) {
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s += "&& " + o.toString();
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});
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return s.length > 3 ? s.slice(3) : s;
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};
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//
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// A semantic context which is true whenever at least one of the contained
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// contexts is true.
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//
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function OR(a, b) {
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SemanticContext.call(this);
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var operands = new Set();
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if (a instanceof OR) {
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a.opnds.map(function(o) {
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operands.add(o);
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});
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} else {
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operands.add(a);
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}
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if (b instanceof OR) {
|
||||
b.opnds.map(function(o) {
|
||||
operands.add(o);
|
||||
});
|
||||
} else {
|
||||
operands.add(b);
|
||||
}
|
||||
|
||||
var precedencePredicates = PrecedencePredicate.filterPrecedencePredicates(operands);
|
||||
if (precedencePredicates.length > 0) {
|
||||
// interested in the transition with the highest precedence
|
||||
var s = precedencePredicates.sort(function(a, b) {
|
||||
return a.compareTo(b);
|
||||
});
|
||||
var reduced = s[s.length-1];
|
||||
operands.add(reduced);
|
||||
}
|
||||
this.opnds = operands.values();
|
||||
return this;
|
||||
}
|
||||
|
||||
OR.prototype = Object.create(SemanticContext.prototype);
|
||||
OR.prototype.constructor = OR;
|
||||
|
||||
OR.prototype.constructor = function(other) {
|
||||
if (this === other) {
|
||||
return true;
|
||||
} else if (!(other instanceof OR)) {
|
||||
return false;
|
||||
} else {
|
||||
return this.opnds === other.opnds;
|
||||
}
|
||||
};
|
||||
|
||||
OR.prototype.updateHashCode = function(hash) {
|
||||
hash.update(this.opnds, "OR");
|
||||
};
|
||||
|
||||
// <p>
|
||||
// The evaluation of predicates by this context is short-circuiting, but
|
||||
// unordered.</p>
|
||||
//
|
||||
OR.prototype.evaluate = function(parser, outerContext) {
|
||||
for (var i = 0; i < this.opnds.length; i++) {
|
||||
if (this.opnds[i].evaluate(parser, outerContext)) {
|
||||
equals(other) {
|
||||
if (this === other) {
|
||||
return true;
|
||||
} else if (!(other instanceof AND)) {
|
||||
return false;
|
||||
} else {
|
||||
return this.opnds === other.opnds;
|
||||
}
|
||||
}
|
||||
return false;
|
||||
};
|
||||
|
||||
OR.prototype.evalPrecedence = function(parser, outerContext) {
|
||||
var differs = false;
|
||||
var operands = [];
|
||||
for (var i = 0; i < this.opnds.length; i++) {
|
||||
var context = this.opnds[i];
|
||||
var evaluated = context.evalPrecedence(parser, outerContext);
|
||||
differs |= (evaluated !== context);
|
||||
if (evaluated === SemanticContext.NONE) {
|
||||
// The OR context is true if any element is true
|
||||
return SemanticContext.NONE;
|
||||
} else if (evaluated !== null) {
|
||||
// Reduce the result by skipping false elements
|
||||
operands.push(evaluated);
|
||||
}
|
||||
updateHashCode(hash) {
|
||||
hash.update(this.opnds, "AND");
|
||||
}
|
||||
if (!differs) {
|
||||
|
||||
/**
|
||||
* {@inheritDoc}
|
||||
*
|
||||
* <p>
|
||||
* The evaluation of predicates by this context is short-circuiting, but
|
||||
* unordered.</p>
|
||||
*/
|
||||
evaluate(parser, outerContext) {
|
||||
for (let i = 0; i < this.opnds.length; i++) {
|
||||
if (!this.opnds[i].evaluate(parser, outerContext)) {
|
||||
return false;
|
||||
}
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
evalPrecedence(parser, outerContext) {
|
||||
let differs = false;
|
||||
const operands = [];
|
||||
for (let i = 0; i < this.opnds.length; i++) {
|
||||
const context = this.opnds[i];
|
||||
const evaluated = context.evalPrecedence(parser, outerContext);
|
||||
differs |= (evaluated !== context);
|
||||
if (evaluated === null) {
|
||||
// The AND context is false if any element is false
|
||||
return null;
|
||||
} else if (evaluated !== SemanticContext.NONE) {
|
||||
// Reduce the result by skipping true elements
|
||||
operands.push(evaluated);
|
||||
}
|
||||
}
|
||||
if (!differs) {
|
||||
return this;
|
||||
}
|
||||
if (operands.length === 0) {
|
||||
// all elements were true, so the AND context is true
|
||||
return SemanticContext.NONE;
|
||||
}
|
||||
let result = null;
|
||||
operands.map(function(o) {
|
||||
result = result === null ? o : SemanticContext.andContext(result, o);
|
||||
});
|
||||
return result;
|
||||
}
|
||||
|
||||
toString() {
|
||||
let s = "";
|
||||
this.opnds.map(function(o) {
|
||||
s += "&& " + o.toString();
|
||||
});
|
||||
return s.length > 3 ? s.slice(3) : s;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
class OR extends SemanticContext {
|
||||
/**
|
||||
* A semantic context which is true whenever at least one of the contained
|
||||
* contexts is true
|
||||
*/
|
||||
constructor(a, b) {
|
||||
super();
|
||||
const operands = new Set();
|
||||
if (a instanceof OR) {
|
||||
a.opnds.map(function(o) {
|
||||
operands.add(o);
|
||||
});
|
||||
} else {
|
||||
operands.add(a);
|
||||
}
|
||||
if (b instanceof OR) {
|
||||
b.opnds.map(function(o) {
|
||||
operands.add(o);
|
||||
});
|
||||
} else {
|
||||
operands.add(b);
|
||||
}
|
||||
|
||||
const precedencePredicates = PrecedencePredicate.filterPrecedencePredicates(operands);
|
||||
if (precedencePredicates.length > 0) {
|
||||
// interested in the transition with the highest precedence
|
||||
const s = precedencePredicates.sort(function(a, b) {
|
||||
return a.compareTo(b);
|
||||
});
|
||||
const reduced = s[s.length-1];
|
||||
operands.add(reduced);
|
||||
}
|
||||
this.opnds = operands.values();
|
||||
return this;
|
||||
}
|
||||
if (operands.length === 0) {
|
||||
// all elements were false, so the OR context is false
|
||||
return null;
|
||||
|
||||
equals(other) {
|
||||
if (this === other) {
|
||||
return true;
|
||||
} else if (!(other instanceof OR)) {
|
||||
return false;
|
||||
} else {
|
||||
return this.opnds === other.opnds;
|
||||
}
|
||||
}
|
||||
var result = null;
|
||||
operands.map(function(o) {
|
||||
return result === null ? o : SemanticContext.orContext(result, o);
|
||||
});
|
||||
return result;
|
||||
};
|
||||
|
||||
OR.prototype.toString = function() {
|
||||
var s = "";
|
||||
this.opnds.map(function(o) {
|
||||
s += "|| " + o.toString();
|
||||
});
|
||||
return s.length > 3 ? s.slice(3) : s;
|
||||
};
|
||||
updateHashCode(hash) {
|
||||
hash.update(this.opnds, "OR");
|
||||
}
|
||||
|
||||
exports.SemanticContext = SemanticContext;
|
||||
exports.PrecedencePredicate = PrecedencePredicate;
|
||||
exports.Predicate = Predicate;
|
||||
/**
|
||||
* <p>
|
||||
* The evaluation of predicates by this context is short-circuiting, but
|
||||
* unordered.</p>
|
||||
*/
|
||||
evaluate(parser, outerContext) {
|
||||
for (let i = 0; i < this.opnds.length; i++) {
|
||||
if (this.opnds[i].evaluate(parser, outerContext)) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
evalPrecedence(parser, outerContext) {
|
||||
let differs = false;
|
||||
const operands = [];
|
||||
for (let i = 0; i < this.opnds.length; i++) {
|
||||
const context = this.opnds[i];
|
||||
const evaluated = context.evalPrecedence(parser, outerContext);
|
||||
differs |= (evaluated !== context);
|
||||
if (evaluated === SemanticContext.NONE) {
|
||||
// The OR context is true if any element is true
|
||||
return SemanticContext.NONE;
|
||||
} else if (evaluated !== null) {
|
||||
// Reduce the result by skipping false elements
|
||||
operands.push(evaluated);
|
||||
}
|
||||
}
|
||||
if (!differs) {
|
||||
return this;
|
||||
}
|
||||
if (operands.length === 0) {
|
||||
// all elements were false, so the OR context is false
|
||||
return null;
|
||||
}
|
||||
const result = null;
|
||||
operands.map(function(o) {
|
||||
return result === null ? o : SemanticContext.orContext(result, o);
|
||||
});
|
||||
return result;
|
||||
}
|
||||
|
||||
toString() {
|
||||
let s = "";
|
||||
this.opnds.map(function(o) {
|
||||
s += "|| " + o.toString();
|
||||
});
|
||||
return s.length > 3 ? s.slice(3) : s;
|
||||
}
|
||||
}
|
||||
|
||||
module.exports = {
|
||||
SemanticContext,
|
||||
PrecedencePredicate,
|
||||
Predicate
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue