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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0
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 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
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 * The Original Code is Rhino code, released
 * May 6, 1999.
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 *   Google Inc.
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package com.google.javascript.rhino;

import com.google.common.collect.ImmutableMap;
import org.jspecify.nullness.Nullable;

/**
 * Enum of primitive functions that the compiler recognizes
 *
 * 

These correspond to the @closurePrimitive tag in code; in order to parse new primitives, add * any entry to the list in parsing/ParserConfig.properties, then map it to an enum member in the * idToEnum map. * *

After typechecking is done, all calls to one of these primitive types should have their * FunctionType annotated with the corresponding enum member. This is intended to make identifying * these calls more accurate than previous methods of finding primitives by qualified name. */ public enum ClosurePrimitive { ASSERTS_FAIL, // A function that always throws an error ASSERTS_MATCHES_RETURN, // A function that asserts its first parameter matches the return type ASSERTS_TRUTHY; // A function that asserts its first parameter is truthy and returns the param /** * Maps human-readable ids to enum members. * *

The expected mapping (although not enforced) of keys -> values is that the enum member maps * to a lowercase string with "_" replaced with "." */ private static final ImmutableMap ID_TO_ENUM = ImmutableMap.of( "asserts.fail", ASSERTS_FAIL, "asserts.truthy", ASSERTS_TRUTHY, "asserts.matchesReturn", ASSERTS_MATCHES_RETURN); /** * Returns the ClosurePrimitive corresponding to the given string id. * *

This is to make reading {@code @closurePrimitive} easier in code. Using Enum.valueOf to * parse closure primitive identifiers from JSDoc directly would require code like {@code * closurePrimitive {ASSERTS_FAIL}}; instead we separate the string ids from the enum names. * * @param id a string id that normalized to an enum member, or null * @throws IllegalArgumentException if the id is non-null but does not match an enum member * @return null if the argument is null, otherwise the corresponding enum member */ public static @Nullable ClosurePrimitive fromStringId(@Nullable String id) { if (id == null) { return null; } ClosurePrimitive primitive = ID_TO_ENUM.get(id); if (primitive == null) { throw new IllegalArgumentException( "String id " + id + " does not match any ClosurePrimitive"); } return primitive; } }





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