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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
 *
 * 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
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Rhino code, released
 * May 6, 1999.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1997-1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Roger Lawrence
 *   Mike McCabe
 *   Igor Bukanov
 *   Milen Nankov
 *
 * Alternatively, the contents of this file may be used under the terms of
 * the GNU General Public License Version 2 or later (the "GPL"), in which
 * case the provisions of the GPL are applicable instead of those above. If
 * you wish to allow use of your version of this file only under the terms of
 * the GPL and not to allow others to use your version of this file under the
 * MPL, indicate your decision by deleting the provisions above and replacing
 * them with the notice and other provisions required by the GPL. If you do
 * not delete the provisions above, a recipient may use your version of this
 * file under either the MPL or the GPL.
 *
 * ***** END LICENSE BLOCK ***** */

package com.google.javascript.rhino;

/**
 * This class implements the JavaScript scanner.
 *
 * 

It is based on the C source files jsscan.c and jsscan.h in the jsref package. * */ public enum Token { RETURN, BITOR, BITXOR, BITAND, EQ, NE, LT, LE, GT, GE, LSH, RSH, URSH, ADD, SUB, MUL, DIV, MOD, EXPONENT, NOT, BITNOT, POS, NEG, NEW, DELPROP, TYPEOF, GETPROP, GETELEM, CALL, // Part of optional chain (?.) OPTCHAIN_GETPROP, OPTCHAIN_GETELEM, OPTCHAIN_CALL, NAME, NUMBER, BIGINT, STRINGLIT, NULL, THIS, FALSE, TRUE, SHEQ, // shallow equality (===) SHNE, // shallow inequality (!==) REGEXP, THROW, IN, INSTANCEOF, ARRAYLIT, // array literal OBJECTLIT, // object literal TRY, PARAM_LIST, COMMA, // comma operator ASSIGN, // simple assignment (=) ASSIGN_BITOR, // |= ASSIGN_BITXOR, // ^= ASSIGN_BITAND, // &= ASSIGN_LSH, // <<= ASSIGN_RSH, // >>= ASSIGN_URSH, // >>>= ASSIGN_ADD, // += ASSIGN_SUB, // -= ASSIGN_MUL, // *= ASSIGN_DIV, // /= ASSIGN_MOD, // %= ASSIGN_EXPONENT, // **= ASSIGN_OR, // logical or assignment (||=) ASSIGN_AND, // logical and assignment (&&=) ASSIGN_COALESCE, // logical nullish coalesce assignment (??=) HOOK, // conditional (?:) OR, // logical or (||) AND, // logical and (&&) COALESCE, // Nullish coalesce (??) INC, // increment (++) DEC, // decrement (--) FUNCTION, // function keyword IF, // if keyword SWITCH, // switch keyword CASE, // case keyword DEFAULT_CASE, // default keyword WHILE, // while keyword DO, // do keyword FOR, // for(;;) statement FOR_IN, // for-in BREAK, // break keyword CONTINUE, // continue keyword VAR, // var keyword WITH, // with keyword CATCH, // catch keyword VOID, // void keyword EMPTY, ROOT, // Used only for the 3 root nodes of the AST: externsRoot, jsRoot, and externsAndJsRoot BLOCK, // statement block LABEL, // label EXPR_RESULT, // expression statement in scripts SCRIPT, // top-level node for entire script GETTER_DEF, SETTER_DEF, CONST, // JS 1.5 const keyword DEBUGGER, // JSCompiler introduced tokens LABEL_NAME, STRING_KEY, // object literal key CAST, // ES6 ARRAY_PATTERN, // destructuring patterns OBJECT_PATTERN, DESTRUCTURING_LHS, // The node inside a var/let/const with a destructuring LHS CLASS, // classes CLASS_MEMBERS, // class member container MEMBER_FUNCTION_DEF, MEMBER_FIELD_DEF, // class field general case COMPUTED_FIELD_DEF, // class field computed property case SUPER, LET, // block scoped vars FOR_OF, // for-of FOR_AWAIT_OF, // for-await-of YIELD, // generators AWAIT, // async functions IMPORT, // modules IMPORT_SPECS, IMPORT_SPEC, IMPORT_STAR, // "* as name", called NameSpaceImport in the spec. EXPORT, EXPORT_SPECS, EXPORT_SPEC, MODULE_BODY, DYNAMIC_IMPORT, ITER_REST, // Rests that use the iterator protocol. OBJECT_REST, // Rests that get object properties. ITER_SPREAD, // Spreads that use the iterator protocol. OBJECT_SPREAD, // Spreads that get object properties. COMPUTED_PROP, TAGGED_TEMPLATELIT, // tagged template literal, e.g. foo`bar` TEMPLATELIT, // template literal, e.g: `bar` TEMPLATELIT_SUB, // template literal substitution TEMPLATELIT_STRING, // template literal string DEFAULT_VALUE, // Formal parameter or destructuring element with a default value NEW_TARGET, // new.target IMPORT_META, // import.meta // Used by type declaration ASTs STRING_TYPE, BOOLEAN_TYPE, NUMBER_TYPE, FUNCTION_TYPE, PARAMETERIZED_TYPE, UNION_TYPE, ANY_TYPE, NULLABLE_TYPE, VOID_TYPE, REST_PARAMETER_TYPE, NAMED_TYPE, OPTIONAL_PARAMETER, RECORD_TYPE, UNDEFINED_TYPE, ARRAY_TYPE, GENERIC_TYPE, GENERIC_TYPE_LIST, // JSDoc-only tokens ANNOTATION, PIPE, STAR, EOC, QMARK, // type is nullable or unknown BANG, EQUALS, LB, // left brackets LC, // left curly braces COLON, // TypeScript INTERFACE, INTERFACE_EXTENDS, INTERFACE_MEMBERS, ENUM, ENUM_MEMBERS, IMPLEMENTS, TYPE_ALIAS, DECLARE, MEMBER_VARIABLE_DEF, INDEX_SIGNATURE, CALL_SIGNATURE, NAMESPACE, NAMESPACE_ELEMENTS, // Tokens to use for internal bookkeeping, // an AST is invalid while these are present. PLACEHOLDER1, PLACEHOLDER2, PLACEHOLDER3; /** If the arity isn't always the same, this function returns -1 */ public static int arity(Token token) { switch (token) { case ANNOTATION: case ARRAYLIT: case BANG: case BLOCK: case ROOT: case BREAK: case CALL: case OPTCHAIN_CALL: case COLON: case CONST: case CONTINUE: case DEBUGGER: case EOC: case EQUALS: case FOR: case IF: case LB: case LC: case NEW: case OBJECTLIT: case PARAM_LIST: case PIPE: case QMARK: case REGEXP: case RETURN: case SCRIPT: case STAR: case STRING_KEY: case SWITCH: case TEMPLATELIT: case TRY: case VAR: case YIELD: case MEMBER_FIELD_DEF: case COMPUTED_FIELD_DEF: return -1; case EMPTY: case FALSE: case IMPORT_STAR: case LABEL_NAME: case MEMBER_VARIABLE_DEF: case NAME: case NULL: case NUMBER: case BIGINT: case STRINGLIT: case TEMPLATELIT_STRING: case THIS: case TRUE: return 0; case AWAIT: case BITNOT: case CALL_SIGNATURE: case CAST: case DEC: case DEFAULT_CASE: case DELPROP: case EXPR_RESULT: case GETPROP: case GETTER_DEF: case INC: case INDEX_SIGNATURE: case ITER_REST: case ITER_SPREAD: case MEMBER_FUNCTION_DEF: case NAMED_TYPE: case NEG: case NOT: case OBJECT_REST: case OBJECT_SPREAD: case OPTCHAIN_GETPROP: case POS: case SETTER_DEF: case TEMPLATELIT_SUB: case THROW: case TYPEOF: case TYPE_ALIAS: case VOID: return 1; case ADD: case AND: case ASSIGN: case ASSIGN_ADD: case ASSIGN_BITAND: case ASSIGN_BITOR: case ASSIGN_BITXOR: case ASSIGN_DIV: case ASSIGN_LSH: case ASSIGN_MOD: case ASSIGN_MUL: case ASSIGN_EXPONENT: case ASSIGN_RSH: case ASSIGN_SUB: case ASSIGN_URSH: case ASSIGN_OR: case ASSIGN_AND: case ASSIGN_COALESCE: case BITAND: case BITOR: case BITXOR: case CASE: case COALESCE: case CATCH: case COMMA: case COMPUTED_PROP: case DEFAULT_VALUE: case DIV: case DO: case ENUM: case EQ: case EXPONENT: case GE: case GETELEM: case OPTCHAIN_GETELEM: case GT: case IN: case INSTANCEOF: case LABEL: case LE: case LSH: case LT: case MOD: case MUL: case NAMESPACE: case NE: case OR: case RSH: case SHEQ: case SHNE: case SUB: case TAGGED_TEMPLATELIT: case URSH: case WHILE: case WITH: return 2; case CLASS: case FOR_IN: case FOR_OF: case FOR_AWAIT_OF: case FUNCTION: case HOOK: case IMPORT: case INTERFACE: return 3; default: throw new IllegalStateException("No arity defined for " + token); } } }





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