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NodeUtilTest.java
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NodeUtilTest.java
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/*
* Copyright 2004 The Closure Compiler Authors.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.javascript.jscomp;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.truth.Truth.assertThat;
import static com.google.common.truth.Truth.assertWithMessage;
import static com.google.javascript.jscomp.DiagnosticGroups.ES5_STRICT;
import static com.google.javascript.jscomp.testing.NodeSubject.assertNode;
import com.google.common.base.Joiner;
import com.google.common.base.Predicates;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.javascript.jscomp.AbstractCompiler.LifeCycleStage;
import com.google.javascript.jscomp.CompilerOptions.LanguageMode;
import com.google.javascript.jscomp.parsing.parser.FeatureSet;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.JSTypeExpression;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import com.google.javascript.rhino.jstype.TernaryValue;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
import javax.annotation.Nullable;
import junit.framework.TestCase;
/** Tests for NodeUtil */
public final class NodeUtilTest extends TestCase {
private static Node parse(String js) {
CompilerOptions options = new CompilerOptions();
options.setLanguageIn(LanguageMode.ECMASCRIPT_NEXT);
// To allow octal literals such as 0123 to be parsed.
options.setStrictModeInput(false);
options.setWarningLevel(ES5_STRICT, CheckLevel.OFF);
Compiler compiler = new Compiler();
compiler.initOptions(options);
Node n = compiler.parseTestCode(js);
assertThat(compiler.getErrors()).isEmpty();
return n;
}
private static Node getNode(String js) {
Node root = parse("var a=(" + js + ");");
Node expr = root.getFirstChild();
Node var = expr.getFirstChild();
return var.getFirstChild();
}
private static Node getNode(Node root, Token token) {
for (Node n : root.children()) {
if (n.getToken() == token) {
return n;
}
Node potentialMatch = getNode(n, token);
if (potentialMatch != null) {
return potentialMatch;
}
}
return null;
}
private static Node getYieldNode(String js) {
return checkNotNull(getYieldNode(parse(js)));
}
private static Node getYieldNode(Node root) {
return getNode(root, Token.YIELD);
}
private static Node getAwaitNode(String js) {
return checkNotNull(getAwaitNode(parse(js)));
}
private static Node getAwaitNode(Node root) {
return getNode(root, Token.AWAIT);
}
public void testGetNodeByLineCol_1() {
Node root = parse("var x = 1;");
assertNull(NodeUtil.getNodeByLineCol(root, 1, 0));
assertNode(NodeUtil.getNodeByLineCol(root, 1, 1)).hasType(Token.VAR);
assertNode(NodeUtil.getNodeByLineCol(root, 1, 2)).hasType(Token.VAR);
assertNode(NodeUtil.getNodeByLineCol(root, 1, 5)).hasType(Token.NAME);
assertNode(NodeUtil.getNodeByLineCol(root, 1, 9)).hasType(Token.NUMBER);
assertNode(NodeUtil.getNodeByLineCol(root, 1, 11)).hasType(Token.VAR);
}
public void testGetNodeByLineCol_2() {
Node root = parse(Joiner.on("\n").join(
"var x = {};",
"x.prop = 123;"));
assertNode(NodeUtil.getNodeByLineCol(root, 2, 1)).hasType(Token.NAME);
assertNode(NodeUtil.getNodeByLineCol(root, 2, 2)).hasType(Token.NAME);
assertNode(NodeUtil.getNodeByLineCol(root, 2, 3)).hasType(Token.STRING);
assertNode(NodeUtil.getNodeByLineCol(root, 2, 8)).hasType(Token.ASSIGN);
assertNode(NodeUtil.getNodeByLineCol(root, 2, 11)).hasType(Token.NUMBER);
assertNode(NodeUtil.getNodeByLineCol(root, 2, 13)).hasType(Token.NUMBER);
assertNode(NodeUtil.getNodeByLineCol(root, 2, 14)).hasType(Token.EXPR_RESULT);
}
public void testGetNodeByLineCol_preferLiterals() {
Node root;
root = parse("x-5;");
assertNode(NodeUtil.getNodeByLineCol(root, 1, 2)).hasType(Token.NAME);
assertNode(NodeUtil.getNodeByLineCol(root, 1, 3)).hasType(Token.NUMBER);
root = parse(Joiner.on("\n").join(
"function f(x) {",
" return x||null;",
"}"));
assertNode(NodeUtil.getNodeByLineCol(root, 2, 11)).hasType(Token.NAME);
assertNode(NodeUtil.getNodeByLineCol(root, 2, 12)).hasType(Token.OR);
assertNode(NodeUtil.getNodeByLineCol(root, 2, 13)).hasType(Token.NULL);
}
public void testIsLiteralOrConstValue() {
assertLiteralAndImmutable(getNode("10"));
assertLiteralAndImmutable(getNode("-10"));
assertLiteralButNotImmutable(getNode("[10, 20]"));
assertLiteralButNotImmutable(getNode("{'a': 20}"));
assertLiteralButNotImmutable(getNode("[10, , 1.0, [undefined], 'a']"));
assertLiteralButNotImmutable(getNode("/abc/"));
assertLiteralAndImmutable(getNode("\"string\""));
assertLiteralAndImmutable(getNode("'aaa'"));
assertLiteralAndImmutable(getNode("null"));
assertLiteralAndImmutable(getNode("undefined"));
assertLiteralAndImmutable(getNode("void 0"));
assertNotLiteral(getNode("abc"));
assertNotLiteral(getNode("[10, foo(), 20]"));
assertNotLiteral(getNode("foo()"));
assertNotLiteral(getNode("c + d"));
assertNotLiteral(getNode("{'a': foo()}"));
assertNotLiteral(getNode("void foo()"));
}
public void testObjectLiteralIsLiteralValue() {
assertTrue(isLiteralValue("{a: 20}"));
assertTrue(isLiteralValue("{'a': 20}"));
assertTrue(isLiteralValue("{a: function() {}}"));
assertFalse(isLiteralValueExcludingFunctions("{a: function() {}}"));
assertTrue(isLiteralValue("{a() {}}"));
assertFalse(isLiteralValueExcludingFunctions("{a() {}}"));
assertTrue(isLiteralValue("{'a'() {}}"));
assertFalse(isLiteralValueExcludingFunctions("{'a'() {}}"));
assertTrue(isLiteralValue("{['a']: 20}"));
assertFalse(isLiteralValue("{[b]: 20}"));
assertTrue(isLiteralValue("{['a']() {}}"));
assertFalse(isLiteralValue("{[b]() {}}"));
assertFalse(isLiteralValueExcludingFunctions("{['a']() {}}"));
assertTrue(isLiteralValue("{ get a() { return 0; } }"));
assertTrue(isLiteralValue("{ get 'a'() { return 0; } }"));
assertTrue(isLiteralValue("{ get ['a']() { return 0; } }"));
assertTrue(isLiteralValue("{ get 123() { return 0; } }"));
assertTrue(isLiteralValue("{ get [123]() { return 0; } }"));
assertFalse(isLiteralValue("{ get [b]() { return 0; } }"));
assertTrue(isLiteralValue("{ set a(x) { } }"));
assertTrue(isLiteralValue("{ set 'a'(x) { } }"));
assertTrue(isLiteralValue("{ set ['a'](x) { } }"));
assertTrue(isLiteralValue("{ set 123(x) { } }"));
assertTrue(isLiteralValue("{ set [123](x) { } }"));
assertFalse(isLiteralValue("{ set [b](x) { } }"));
}
private boolean isLiteralValueExcludingFunctions(String code) {
return NodeUtil.isLiteralValue(getNode(code), /* includeFunctions */ false);
}
private boolean isLiteralValue(String code) {
return NodeUtil.isLiteralValue(getNode(code), /* includeFunctions */ true);
}
private void assertLiteralAndImmutable(Node n) {
assertTrue(NodeUtil.isLiteralValue(n, true));
assertTrue(NodeUtil.isLiteralValue(n, false));
assertTrue(NodeUtil.isImmutableValue(n));
}
private void assertLiteralButNotImmutable(Node n) {
assertTrue(NodeUtil.isLiteralValue(n, true));
assertTrue(NodeUtil.isLiteralValue(n, false));
assertFalse(NodeUtil.isImmutableValue(n));
}
private void assertNotLiteral(Node n) {
assertFalse(NodeUtil.isLiteralValue(n, true));
assertFalse(NodeUtil.isLiteralValue(n, false));
assertFalse(NodeUtil.isImmutableValue(n));
}
public void testIsStringLiteralStringLiteral() {
assertTrue(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("'b'"))); // String
}
public void testIsStringLiteralTemplateNoSubst() {
assertTrue(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("`b`"))); // Template
}
public void testIsStringLiteralTemplateWithSubstitution() {
// Template with substitution
assertFalse(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("`foo${bar}`")));
}
public void testIsStringLiteralVariable() {
assertFalse(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("b"))); // Variable
}
public void testIsStringLiteralConcatLiterals() {
assertTrue(
NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("'b' + 'c'"))); // String concatenation
}
public void testIsStringLiteralConcatLiteralVariable() {
assertFalse(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("b + 'c'")));
assertFalse(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("'b' + c")));
}
public void testIsStringLiteralTernary() {
assertTrue(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("a ? 'b' : 'c'")));
assertFalse(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("a ? b : 'c'")));
assertFalse(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("a ? 'b' : c")));
assertFalse(NodeUtil.isSomeCompileTimeConstStringValue(parseExpr("a ? b : c")));
}
public void testGetBooleanValue() {
assertPureBooleanTrue("true");
assertPureBooleanTrue("10");
assertPureBooleanTrue("'0'");
assertPureBooleanTrue("/a/");
assertPureBooleanTrue("{}");
assertPureBooleanTrue("[]");
assertPureBooleanFalse("false");
assertPureBooleanFalse("null");
assertPureBooleanFalse("0");
assertPureBooleanFalse("''");
assertPureBooleanFalse("undefined");
assertPureBooleanFalse("void 0");
assertPureBooleanUnknown("void foo()");
assertPureBooleanUnknown("b");
assertPureBooleanUnknown("-'0.0'");
// Known but getBooleanValue return false for expressions with side-effects
assertPureBooleanUnknown("{a:foo()}");
assertPureBooleanUnknown("[foo()]");
assertPureBooleanTrue("`definiteLength`");
assertPureBooleanFalse("``");
assertPureBooleanUnknown("`${indefinite}Length`");
assertPureBooleanTrue("class Klass{}");
assertPureBooleanTrue("new Date()");
}
private void assertPureBooleanTrue(String val) {
assertEquals(TernaryValue.TRUE, NodeUtil.getPureBooleanValue(getNode(val)));
}
private void assertPureBooleanFalse(String val) {
assertEquals(
TernaryValue.FALSE, NodeUtil.getPureBooleanValue(getNode(val)));
}
private void assertPureBooleanUnknown(String val) {
assertEquals(
TernaryValue.UNKNOWN, NodeUtil.getPureBooleanValue(getNode(val)));
}
public void testGetExpressionBooleanValue() {
assertImpureBooleanTrue("a=true");
assertImpureBooleanFalse("a=false");
assertImpureBooleanTrue("a=(false,true)");
assertImpureBooleanFalse("a=(true,false)");
assertImpureBooleanTrue("a=(false || true)");
assertImpureBooleanFalse("a=(true && false)");
assertImpureBooleanTrue("a=!(true && false)");
assertImpureBooleanTrue("a,true");
assertImpureBooleanFalse("a,false");
assertImpureBooleanTrue("true||false");
assertImpureBooleanFalse("false||false");
assertImpureBooleanTrue("true&&true");
assertImpureBooleanFalse("true&&false");
assertImpureBooleanFalse("!true");
assertImpureBooleanTrue("!false");
assertImpureBooleanTrue("!''");
// Assignment ops other than ASSIGN are unknown.
assertImpureBooleanUnknown("a *= 2");
// Complex expressions that contain anything other then "=", ",", or "!" are
// unknown.
assertImpureBooleanUnknown("2 + 2");
assertImpureBooleanTrue("a=1");
assertImpureBooleanTrue("a=/a/");
assertImpureBooleanTrue("a={}");
assertImpureBooleanTrue("true");
assertImpureBooleanTrue("10");
assertImpureBooleanTrue("'0'");
assertImpureBooleanTrue("/a/");
assertImpureBooleanTrue("{}");
assertImpureBooleanTrue("[]");
assertImpureBooleanFalse("false");
assertImpureBooleanFalse("null");
assertImpureBooleanFalse("0");
assertImpureBooleanFalse("''");
assertImpureBooleanFalse("undefined");
assertImpureBooleanFalse("void 0");
assertImpureBooleanFalse("void foo()");
assertImpureBooleanTrue("a?true:true");
assertImpureBooleanFalse("a?false:false");
assertImpureBooleanUnknown("a?true:false");
assertImpureBooleanUnknown("a?true:foo()");
assertImpureBooleanUnknown("b");
assertImpureBooleanUnknown("-'0.0'");
assertImpureBooleanTrue("{a:foo()}");
assertImpureBooleanTrue("[foo()]");
assertImpureBooleanTrue("new Date()");
}
private void assertImpureBooleanTrue(String val) {
assertEquals(TernaryValue.TRUE,
NodeUtil.getImpureBooleanValue(getNode(val)));
}
private void assertImpureBooleanFalse(String val) {
assertEquals(TernaryValue.FALSE,
NodeUtil.getImpureBooleanValue(getNode(val)));
}
private void assertImpureBooleanUnknown(String val) {
assertEquals(TernaryValue.UNKNOWN,
NodeUtil.getImpureBooleanValue(getNode(val)));
}
public void testGetStringValue() {
assertEquals("true", NodeUtil.getStringValue(getNode("true")));
assertEquals("10", NodeUtil.getStringValue(getNode("10")));
assertEquals("1", NodeUtil.getStringValue(getNode("1.0")));
/* See https://github.com/google/closure-compiler/issues/1262 */
assertEquals(
"1.2323919403474454e+21", NodeUtil.getStringValue(getNode("1.2323919403474454e+21")));
assertEquals("0", NodeUtil.getStringValue(getNode("'0'")));
assertEquals(null, NodeUtil.getStringValue(getNode("/a/")));
assertEquals("[object Object]", NodeUtil.getStringValue(getNode("{}")));
assertThat(NodeUtil.getStringValue(getNode("[]"))).isEmpty();
assertEquals("false", NodeUtil.getStringValue(getNode("false")));
assertEquals("null", NodeUtil.getStringValue(getNode("null")));
assertEquals("0", NodeUtil.getStringValue(getNode("0")));
assertThat(NodeUtil.getStringValue(getNode("''"))).isEmpty();
assertEquals("undefined", NodeUtil.getStringValue(getNode("undefined")));
assertEquals("undefined", NodeUtil.getStringValue(getNode("void 0")));
assertEquals("undefined", NodeUtil.getStringValue(getNode("void foo()")));
assertEquals("NaN", NodeUtil.getStringValue(getNode("NaN")));
assertEquals("Infinity", NodeUtil.getStringValue(getNode("Infinity")));
assertEquals(null, NodeUtil.getStringValue(getNode("x")));
assertEquals("Hello", NodeUtil.getStringValue(getNode("`Hello`")));
assertEquals("Hello foo", NodeUtil.getStringValue(getNode("`Hello ${'foo'}`")));
assertEquals(null, NodeUtil.getStringValue(getNode("`Hello ${name}`")));
assertEquals("4 bananas", NodeUtil.getStringValue(getNode("`${4} bananas`")));
assertEquals("This is true.", NodeUtil.getStringValue(getNode("`This is ${true}.`")));
assertEquals(null, NodeUtil.getStringValue(getNode("`${'hello'} ${name}`")));
}
public void testGetArrayStringValue() {
assertThat(NodeUtil.getStringValue(getNode("[]"))).isEmpty();
assertThat(NodeUtil.getStringValue(getNode("['']"))).isEmpty();
assertThat(NodeUtil.getStringValue(getNode("[null]"))).isEmpty();
assertThat(NodeUtil.getStringValue(getNode("[undefined]"))).isEmpty();
assertThat(NodeUtil.getStringValue(getNode("[void 0]"))).isEmpty();
assertEquals("NaN", NodeUtil.getStringValue(getNode("[NaN]")));
assertEquals(",", NodeUtil.getStringValue(getNode("[,'']")));
assertEquals(",,", NodeUtil.getStringValue(getNode("[[''],[''],['']]")));
assertEquals("1,2", NodeUtil.getStringValue(getNode("[[1.0],[2.0]]")));
assertEquals(null, NodeUtil.getStringValue(getNode("[a]")));
assertEquals(null, NodeUtil.getStringValue(getNode("[1,a]")));
}
public void testIsObjectLiteralKey1() throws Exception {
assertIsObjectLiteralKey(parseExpr("({})"), false);
assertIsObjectLiteralKey(parseExpr("a"), false);
assertIsObjectLiteralKey(parseExpr("'a'"), false);
assertIsObjectLiteralKey(parseExpr("1"), false);
assertIsObjectLiteralKey(parseExpr("({a: 1})").getFirstChild(), true);
assertIsObjectLiteralKey(parseExpr("({1: 1})").getFirstChild(), true);
assertIsObjectLiteralKey(parseExpr("({get a(){}})").getFirstChild(), true);
assertIsObjectLiteralKey(parseExpr("({set a(b){}})").getFirstChild(), true);
}
private Node parseExpr(String js) {
Node root = parse(js);
return root.getFirstFirstChild();
}
private void assertIsObjectLiteralKey(Node node, boolean expected) {
assertEquals(expected, NodeUtil.isObjectLitKey(node));
}
public void testGetFunctionName1() throws Exception {
Node parent = parse("function name(){}");
assertGetNameResult(parent.getFirstChild(), "name");
}
public void testGetFunctionName2() throws Exception {
Node parent = parse("var name = function(){}")
.getFirstFirstChild();
assertGetNameResult(parent.getFirstChild(), "name");
}
public void testGetFunctionName3() throws Exception {
Node parent = parse("qualified.name = function(){}")
.getFirstFirstChild();
assertGetNameResult(parent.getLastChild(), "qualified.name");
}
public void testGetFunctionName4() throws Exception {
Node parent = parse("var name2 = function name1(){}")
.getFirstFirstChild();
assertGetNameResult(parent.getFirstChild(), "name2");
}
public void testGetFunctionName5() throws Exception {
Node n = parse("qualified.name2 = function name1(){}");
Node parent = n.getFirstFirstChild();
assertGetNameResult(parent.getLastChild(), "qualified.name2");
}
public void testGetBestFunctionName1() throws Exception {
Node parent = parse("function func(){}");
assertEquals("func",
NodeUtil.getNearestFunctionName(parent.getFirstChild()));
}
public void testGetBestFunctionName2() throws Exception {
Node parent = parse("var obj = {memFunc(){}}")
.getFirstFirstChild().getFirstFirstChild();
assertEquals("memFunc",
NodeUtil.getNearestFunctionName(parent.getLastChild()));
}
public void testConstKeywordNamespace() {
Node decl = parse("const ns = {};").getFirstChild();
checkState(decl.isConst(), decl);
Node nameNode = decl.getFirstChild();
checkState(nameNode.isName(), nameNode);
assertThat(NodeUtil.isNamespaceDecl(nameNode)).isTrue();
}
private void assertGetNameResult(Node function, String name) {
assertEquals(Token.FUNCTION, function.getToken());
assertEquals(name, NodeUtil.getName(function));
}
public void testContainsFunctionDeclaration() {
assertTrue(NodeUtil.containsFunction(getNode("function foo(){}")));
assertTrue(NodeUtil.containsFunction(getNode("(b?function(){}:null)")));
assertFalse(NodeUtil.containsFunction(getNode("(b?foo():null)")));
assertFalse(NodeUtil.containsFunction(getNode("foo()")));
}
public void testIsFunctionDeclaration() {
assertTrue(NodeUtil.isFunctionDeclaration(getFunctionNode("function foo(){}")));
assertFalse(NodeUtil.isFunctionDeclaration(getFunctionNode("class C { constructor() {} }")));
assertFalse(NodeUtil.isFunctionDeclaration(getFunctionNode("({ foo() {} })")));
assertFalse(NodeUtil.isFunctionDeclaration(getFunctionNode("var x = function(){}")));
assertTrue(NodeUtil.isFunctionDeclaration(getFunctionNode("export function f() {}")));
assertFalse(NodeUtil.isFunctionDeclaration(getFunctionNode("export default function() {}")));
assertTrue(
NodeUtil.isFunctionDeclaration(getFunctionNode("export default function foo() {}")));
assertFalse(
NodeUtil.isFunctionDeclaration(getFunctionNode("export default (foo) => { alert(foo); }")));
}
public void testIsMethodDeclaration() {
assertTrue(
NodeUtil.isMethodDeclaration(getFunctionNode("class C { constructor() {} }")));
assertTrue(NodeUtil.isMethodDeclaration(getFunctionNode("class C { a() {} }")));
assertTrue(NodeUtil.isMethodDeclaration(getFunctionNode("class C { static a() {} }")));
assertTrue(NodeUtil.isMethodDeclaration(getFunctionNode("({ set foo(v) {} })")));
assertTrue(NodeUtil.isMethodDeclaration(getFunctionNode("({ get foo() {} })")));
assertTrue(NodeUtil.isMethodDeclaration(getFunctionNode("({ [foo]() {} })")));
}
public void testIsClassDeclaration() {
assertTrue(NodeUtil.isClassDeclaration(getClassNode("class Foo {}")));
assertFalse(NodeUtil.isClassDeclaration(getClassNode("var Foo = class {}")));
assertFalse(NodeUtil.isClassDeclaration(getClassNode("var Foo = class Foo{}")));
assertTrue(NodeUtil.isClassDeclaration(getClassNode("export default class Foo {}")));
assertTrue(NodeUtil.isClassDeclaration(getClassNode("export class Foo {}")));
assertFalse(NodeUtil.isClassDeclaration(getClassNode("export default class {}")));
}
private void assertSideEffect(boolean se, String js) {
Node n = parse(js);
assertEquals(se, NodeUtil.mayHaveSideEffects(n.getFirstChild()));
}
private void assertSideEffect(boolean se, Node n) {
assertEquals(se, NodeUtil.mayHaveSideEffects(n));
}
private void assertSideEffect(boolean se, String js, boolean globalRegExp) {
Node n = parse(js);
Compiler compiler = new Compiler();
compiler.initCompilerOptionsIfTesting();
compiler.setHasRegExpGlobalReferences(globalRegExp);
assertEquals(se, NodeUtil.mayHaveSideEffects(n.getFirstChild(), compiler));
}
public void testMayHaveSideEffects() {
assertSideEffect(false, "[1]");
assertSideEffect(false, "[1, 2]");
assertSideEffect(false, "[...[]]");
assertSideEffect(false, "[...[1]]");
assertSideEffect(true, "[...[i++]]");
assertSideEffect(true, "[...f()]");
assertSideEffect(false, "({...x})");
assertSideEffect(false, "({...{}})");
assertSideEffect(false, "({...{a:1}})");
assertSideEffect(true, "({...{a:i++}})");
assertSideEffect(true, "({...{a:f()}})");
assertSideEffect(true, "({...f()})");
assertSideEffect(true, "i++");
assertSideEffect(true, "[b, [a, i++]]");
assertSideEffect(true, "i=3");
assertSideEffect(true, "[0, i=3]");
assertSideEffect(true, "b()");
assertSideEffect(true, "[1, b()]");
assertSideEffect(true, "b.b=4");
assertSideEffect(true, "b.b--");
assertSideEffect(true, "i--");
assertSideEffect(true, "a[0][i=4]");
assertSideEffect(true, "a += 3");
assertSideEffect(true, "a, b, z += 4");
assertSideEffect(true, "a ? c : d++");
assertSideEffect(true, "a + c++");
assertSideEffect(true, "a + c - d()");
assertSideEffect(true, "a + c - d()");
assertSideEffect(true, "function foo() {}");
assertSideEffect(true, "class Foo {}");
assertSideEffect(true, "while(true);");
assertSideEffect(true, "if(true){a()}");
assertSideEffect(false, "if(true){a}");
assertSideEffect(false, "(function() { })");
assertSideEffect(false, "(function() { i++ })");
assertSideEffect(false, "[function a(){}]");
assertSideEffect(false, "(class { })");
assertSideEffect(false, "(class { method() { i++ } })");
assertSideEffect(true, "(class { [computedName()]() {} })");
assertSideEffect(false, "(class { [computedName]() {} })");
assertSideEffect(false, "(class Foo extends Bar { })");
assertSideEffect(true, "(class extends foo() { })");
assertSideEffect(false, "a");
assertSideEffect(false, "a.b");
assertSideEffect(false, "a.b.c");
assertSideEffect(false, "[b, c [d, [e]]]");
assertSideEffect(false, "({a: x, b: y, c: z})");
assertSideEffect(false, "({a, b, c})");
assertSideEffect(false, "/abc/gi");
assertSideEffect(false, "'a'");
assertSideEffect(false, "0");
assertSideEffect(false, "a + c");
assertSideEffect(false, "'c' + a[0]");
assertSideEffect(false, "a[0][1]");
assertSideEffect(false, "'a' + c");
assertSideEffect(false, "'a' + a.name");
assertSideEffect(false, "1, 2, 3");
assertSideEffect(false, "a, b, 3");
assertSideEffect(false, "(function(a, b) { })");
assertSideEffect(false, "a ? c : d");
assertSideEffect(false, "'1' + navigator.userAgent");
assertSideEffect(false, "`template`");
assertSideEffect(false, "`template${name}`");
assertSideEffect(false, "`${name}template`");
assertSideEffect(true, "`${naming()}template`");
assertSideEffect(true, "templateFunction`template`");
assertSideEffect(true, "st = `${name}template`");
assertSideEffect(true, "tempFunc = templateFunction`template`");
assertSideEffect(false, "new RegExp('foobar', 'i')");
assertSideEffect(true, "new RegExp(SomethingWacky(), 'i')");
assertSideEffect(false, "new Array()");
assertSideEffect(false, "new Array");
assertSideEffect(false, "new Array(4)");
assertSideEffect(false, "new Array('a', 'b', 'c')");
assertSideEffect(true, "new SomeClassINeverHeardOf()");
assertSideEffect(true, "new SomeClassINeverHeardOf()");
assertSideEffect(false, "({}).foo = 4");
assertSideEffect(false, "([]).foo = 4");
assertSideEffect(false, "(function() {}).foo = 4");
assertSideEffect(true, "this.foo = 4");
assertSideEffect(true, "a.foo = 4");
assertSideEffect(true, "(function() { return n; })().foo = 4");
assertSideEffect(true, "([]).foo = bar()");
assertSideEffect(false, "undefined");
assertSideEffect(false, "void 0");
assertSideEffect(true, "void foo()");
assertSideEffect(false, "-Infinity");
assertSideEffect(false, "Infinity");
assertSideEffect(false, "NaN");
assertSideEffect(false, "({}||[]).foo = 2;");
assertSideEffect(false, "(true ? {} : []).foo = 2;");
assertSideEffect(false, "({},[]).foo = 2;");
assertSideEffect(true, "delete a.b");
assertSideEffect(false, "Math.random();");
assertSideEffect(true, "Math.random(seed);");
assertSideEffect(false, "[1, 1].foo;");
assertSideEffect(true, "export var x = 0;");
assertSideEffect(true, "export let x = 0;");
assertSideEffect(true, "export const x = 0;");
assertSideEffect(true, "export class X {};");
assertSideEffect(true, "export function x() {};");
assertSideEffect(true, "export {x};");
}
public void testComputedPropSideEffects() {
assertSideEffect(false, "({[a]: x})");
assertSideEffect(true, "({[a()]: x})");
assertSideEffect(true, "({[a]: x()})");
Node computedProp = parse("({[a]: x})") // SCRIPT
.getFirstChild() // EXPR_RESULT
.getFirstChild() // OBJECT_LIT
.getFirstChild(); // COMPUTED_PROP
checkState(computedProp.isComputedProp(), computedProp);
assertSideEffect(false, computedProp);
computedProp = parse("({[a()]: x})") // SCRIPT
.getFirstChild() // EXPR_RESULT
.getFirstChild() // OBJECT_LIT
.getFirstChild(); // COMPUTED_PROP
checkState(computedProp.isComputedProp(), computedProp);
assertSideEffect(true, computedProp);
computedProp = parse("({[a]: x()})") // SCRIPT
.getFirstChild() // EXPR_RESULT
.getFirstChild() // OBJECT_LIT
.getFirstChild(); // COMPUTED_PROP
checkState(computedProp.isComputedProp(), computedProp);
assertSideEffect(true, computedProp);
}
public void testObjectMethodSideEffects() {
// "toString" and "valueOf" are assumed to be side-effect free
assertSideEffect(false, "o.toString()");
assertSideEffect(false, "o.valueOf()");
// other methods depend on the extern definitions
assertSideEffect(true, "o.watch()");
}
public void testRegExpSideEffect() {
// A RegExp Object by itself doesn't have any side-effects
assertSideEffect(false, "/abc/gi", true);
assertSideEffect(false, "/abc/gi", false);
// RegExp instance methods have global side-effects, so whether they are
// considered side-effect free depends on whether the global properties
// are referenced.
assertSideEffect(true, "(/abc/gi).test('')", true);
assertSideEffect(false, "(/abc/gi).test('')", false);
assertSideEffect(true, "(/abc/gi).test(a)", true);
assertSideEffect(false, "(/abc/gi).test(b)", false);
assertSideEffect(true, "(/abc/gi).exec('')", true);
assertSideEffect(false, "(/abc/gi).exec('')", false);
// Some RegExp object method that may have side-effects.
assertSideEffect(true, "(/abc/gi).foo('')", true);
assertSideEffect(true, "(/abc/gi).foo('')", false);
// Try the string RegExp ops.
assertSideEffect(true, "''.match('a')", true);
assertSideEffect(false, "''.match('a')", false);
assertSideEffect(true, "''.match(/(a)/)", true);
assertSideEffect(false, "''.match(/(a)/)", false);
assertSideEffect(true, "''.replace('a')", true);
assertSideEffect(false, "''.replace('a')", false);
assertSideEffect(true, "''.search('a')", true);
assertSideEffect(false, "''.search('a')", false);
assertSideEffect(true, "''.split('a')", true);
assertSideEffect(false, "''.split('a')", false);
// Some non-RegExp string op that may have side-effects.
assertSideEffect(true, "''.foo('a')", true);
assertSideEffect(true, "''.foo('a')", false);
// 'a' might be a RegExp object with the 'g' flag, in which case
// the state might change by running any of the string ops.
// Specifically, using these methods resets the "lastIndex" if used
// in combination with a RegExp instance "exec" method.
assertSideEffect(true, "''.match(a)", true);
assertSideEffect(true, "''.match(a)", false);
}
public void testRegExpSideEffect2() {
assertSideEffect(true, "'a'.replace(/a/, function (s) {alert(s)})", false);
assertSideEffect(false, "'a'.replace(/a/, 'x')", false);
}
private void assertMutableState(boolean se, String js) {
Node n = parse(js);
assertEquals(se, NodeUtil.mayEffectMutableState(n.getFirstChild()));
}
public void testMayEffectMutableState() {
assertMutableState(true, "i++");
assertMutableState(true, "[b, [a, i++]]");
assertMutableState(true, "i=3");
assertMutableState(true, "[0, i=3]");
assertMutableState(true, "b()");
assertMutableState(true, "void b()");
assertMutableState(true, "[1, b()]");
assertMutableState(true, "b.b=4");
assertMutableState(true, "b.b--");
assertMutableState(true, "i--");
assertMutableState(true, "a[0][i=4]");
assertMutableState(true, "a += 3");
assertMutableState(true, "a, b, z += 4");
assertMutableState(true, "a ? c : d++");
assertMutableState(true, "a + c++");
assertMutableState(true, "a + c - d()");
assertMutableState(true, "a + c - d()");
assertMutableState(true, "function foo() {}");
assertMutableState(true, "while(true);");
assertMutableState(true, "if(true){a()}");
assertMutableState(false, "if(true){a}");
assertMutableState(true, "(function() { })");
assertMutableState(true, "(function() { i++ })");
assertMutableState(true, "[function a(){}]");
assertMutableState(false, "a");
assertMutableState(true, "[b, c [d, [e]]]");
assertMutableState(true, "({a: x, b: y, c: z})");
// Note: RegExp objects are not immutable, for instance, the exec
// method maintains state for "global" searches.
assertMutableState(true, "/abc/gi");
assertMutableState(false, "'a'");
assertMutableState(false, "0");
assertMutableState(false, "a + c");
assertMutableState(false, "'c' + a[0]");
assertMutableState(false, "a[0][1]");
assertMutableState(false, "'a' + c");
assertMutableState(false, "'a' + a.name");
assertMutableState(false, "1, 2, 3");
assertMutableState(false, "a, b, 3");
assertMutableState(true, "(function(a, b) { })");
assertMutableState(false, "a ? c : d");
assertMutableState(false, "'1' + navigator.userAgent");
assertMutableState(true, "new RegExp('foobar', 'i')");
assertMutableState(true, "new RegExp(SomethingWacky(), 'i')");
assertMutableState(true, "new Array()");
assertMutableState(true, "new Array");
assertMutableState(true, "new Array(4)");
assertMutableState(true, "new Array('a', 'b', 'c')");
assertMutableState(true, "new SomeClassINeverHeardOf()");
}
public void testIsFunctionExpression() {
assertContainsAnonFunc(true, "(function(){})");
assertContainsAnonFunc(true, "[function a(){}]");
assertContainsAnonFunc(true, "({x: function a(){}})");
assertContainsAnonFunc(true, "(function a(){})()");
assertContainsAnonFunc(true, "x = function a(){};");
assertContainsAnonFunc(true, "var x = function a(){};");
assertContainsAnonFunc(true, "if (function a(){});");
assertContainsAnonFunc(true, "while (function a(){});");
assertContainsAnonFunc(true, "do; while (function a(){});");
assertContainsAnonFunc(true, "for (function a(){};;);");
assertContainsAnonFunc(true, "for (;function a(){};);");
assertContainsAnonFunc(true, "for (;;function a(){});");
assertContainsAnonFunc(true, "for (p in function a(){});");
assertContainsAnonFunc(true, "with (function a(){}) {}");
assertContainsAnonFunc(false, "function a(){}");
assertContainsAnonFunc(false, "if (x) function a(){};");
assertContainsAnonFunc(false, "if (x) { function a(){} }");
assertContainsAnonFunc(false, "if (x); else function a(){};");
assertContainsAnonFunc(false, "while (x) function a(){};");
assertContainsAnonFunc(false, "do function a(){} while (0);");
assertContainsAnonFunc(false, "for (;;) function a(){}");
assertContainsAnonFunc(false, "for (p in o) function a(){};");
assertContainsAnonFunc(false, "with (x) function a(){}");
assertContainsAnonFunc(true, "export default function() {};");
assertContainsAnonFunc(false, "export default function a() {};");
assertContainsAnonFunc(false, "export function a() {};");
assertContainsAnonFunc(false, "class C { a() {} }");
assertContainsAnonFunc(false, "class C { static a() {} }");
assertContainsAnonFunc(false, "x = { a() {} }");
}
private void assertContainsAnonFunc(boolean expected, String js) {
Node funcParent = findParentOfFuncOrClassDescendant(parse(js), Token.FUNCTION);
assertNotNull("Expected function node in parse tree of: " + js, funcParent);
Node funcNode = getFuncOrClassChild(funcParent, Token.FUNCTION);
assertEquals(expected, NodeUtil.isFunctionExpression(funcNode));
}
public void testIsClassExpression() {
assertContainsAnonClass(true, "(class {})");
assertContainsAnonClass(true, "[class Clazz {}]");
assertContainsAnonClass(true, "({x: class Clazz {}})");
assertContainsAnonClass(true, "x = class Clazz {};");
assertContainsAnonClass(true, "var x = class Clazz {};");
assertContainsAnonClass(true, "if (class Clazz {});");
assertContainsAnonClass(true, "while (class Clazz {});");
assertContainsAnonClass(true, "do; while (class Clazz {});");
assertContainsAnonClass(true, "for (class Clazz {};;);");
assertContainsAnonClass(true, "for (;class Clazz {};);");
assertContainsAnonClass(true, "for (;;class Clazz {});");
assertContainsAnonClass(true, "for (p in class Clazz {});");
assertContainsAnonClass(true, "with (class Clazz {}) {}");
assertContainsAnonClass(false, "class Clazz {}");
assertContainsAnonClass(false, "if (x) class Clazz {};");
assertContainsAnonClass(false, "if (x) { class Clazz {} }");
assertContainsAnonClass(false, "if (x); else class Clazz {};");
assertContainsAnonClass(false, "while (x) class Clazz {};");
assertContainsAnonClass(false, "do class Clazz {} while (0);");
assertContainsAnonClass(false, "for (;;) class Clazz {}");
assertContainsAnonClass(false, "for (p in o) class Clazz {};");
assertContainsAnonClass(false, "with (x) class Clazz {}");
assertContainsAnonClass(true, "export default class {};");
assertContainsAnonClass(false, "export default class Clazz {};");
assertContainsAnonClass(false, "export class Clazz {};");
}
private void assertContainsAnonClass(boolean expected, String js) {
Node classParent = findParentOfFuncOrClassDescendant(parse(js), Token.CLASS);
assertNotNull("Expected class node in parse tree of: " + js, classParent);
Node classNode = getFuncOrClassChild(classParent, Token.CLASS);
assertEquals(expected, NodeUtil.isClassExpression(classNode));
}
private Node findParentOfFuncOrClassDescendant(Node n, Token token) {
checkArgument(token.equals(Token.CLASS) || token.equals(Token.FUNCTION));
for (Node c = n.getFirstChild(); c != null; c = c.getNext()) {
if (c.getToken().equals(token)) {
return n;
}
Node result = findParentOfFuncOrClassDescendant(c, token);
if (result != null) {
return result;
}
}
return null;
}
private Node getFuncOrClassChild(Node n, Token token) {
checkArgument(token.equals(Token.CLASS) || token.equals(Token.FUNCTION));
for (Node c = n.getFirstChild(); c != null; c = c.getNext()) {
if (c.getToken().equals(token)) {
return c;
}
}
return null;
}
public void testContainsType() {
assertTrue(NodeUtil.containsType(
parse("this"), Token.THIS));
assertTrue(NodeUtil.containsType(
parse("function foo(){}(this)"), Token.THIS));
assertTrue(NodeUtil.containsType(
parse("b?this:null"), Token.THIS));
assertFalse(NodeUtil.containsType(
parse("a"), Token.THIS));
assertFalse(NodeUtil.containsType(
parse("function foo(){}"), Token.THIS));
assertFalse(NodeUtil.containsType(
parse("(b?foo():null)"), Token.THIS));
}
public void testReferencesThis() {
assertTrue(NodeUtil.referencesThis(
parse("this")));
// Don't descend into functions (starts at the script node)
assertFalse(NodeUtil.referencesThis(
parse("function foo(){this}")));
// But starting with a function properly check for 'this'
Node n = parse("function foo(){this}").getFirstChild();
assertEquals(Token.FUNCTION, n.getToken());
assertTrue(NodeUtil.referencesThis(n));
assertTrue(NodeUtil.referencesThis(
parse("b?this:null")));
assertFalse(NodeUtil.referencesThis(
parse("a")));
n = parse("function foo(){}").getFirstChild();
assertEquals(Token.FUNCTION, n.getToken());
assertFalse(NodeUtil.referencesThis(n));
assertFalse(NodeUtil.referencesThis(
parse("(b?foo():null)")));
assertTrue(NodeUtil.referencesThis(parse("()=>this")));
assertTrue(NodeUtil.referencesThis(parse("() => { () => alert(this); }")));
}
public void testGetNodeTypeReferenceCount() {
assertEquals(
0,
NodeUtil.getNodeTypeReferenceCount(
parse("function foo(){}"), Token.THIS, Predicates.<Node>alwaysTrue()));
assertEquals(
1,
NodeUtil.getNodeTypeReferenceCount(
parse("this"), Token.THIS, Predicates.<Node>alwaysTrue()));
assertEquals(
2,
NodeUtil.getNodeTypeReferenceCount(
parse("this;function foo(){}(this)"), Token.THIS, Predicates.<Node>alwaysTrue()));
}
public void testIsNameReferenceCount() {
assertTrue(NodeUtil.isNameReferenced(
parse("function foo(){}"), "foo"));
assertTrue(NodeUtil.isNameReferenced(
parse("var foo = function(){}"), "foo"));
assertFalse(NodeUtil.isNameReferenced(
parse("function foo(){}"), "undefined"));
assertTrue(NodeUtil.isNameReferenced(
parse("undefined"), "undefined"));
assertTrue(NodeUtil.isNameReferenced(
parse("undefined;function foo(){}(undefined)"), "undefined"));
assertTrue(NodeUtil.isNameReferenced(
parse("goo.foo"), "goo"));
assertFalse(NodeUtil.isNameReferenced(