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/*
* Copyright 2006 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.checkState;
import static com.google.javascript.jscomp.ClosurePrimitiveErrors.INVALID_CLOSURE_CALL_SCOPE_ERROR;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.Node;
import com.google.javascript.rhino.Token;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
import javax.annotation.Nullable;
/**
* Performs some Closure-specific simplifications including rewriting goog.base, goog.addDependency.
*
* Adds forwardDeclared and goog.defined names to the compiler.
*/
class ProcessClosurePrimitives extends AbstractPostOrderCallback implements HotSwapCompilerPass {
static final DiagnosticType NULL_ARGUMENT_ERROR = DiagnosticType.error(
"JSC_NULL_ARGUMENT_ERROR",
"method \"{0}\" called without an argument");
static final DiagnosticType EXPECTED_OBJECTLIT_ERROR = DiagnosticType.error(
"JSC_EXPECTED_OBJECTLIT_ERROR",
"method \"{0}\" expected an object literal argument");
static final DiagnosticType EXPECTED_STRING_ERROR =
DiagnosticType.error(
"JSC_EXPECTED_STRING_ERROR", "method \"{0}\" expected a string argument");
static final DiagnosticType INVALID_ARGUMENT_ERROR = DiagnosticType.error(
"JSC_INVALID_ARGUMENT_ERROR",
"method \"{0}\" called with invalid argument");
static final DiagnosticType INVALID_STYLE_ERROR = DiagnosticType.error(
"JSC_INVALID_CSS_NAME_MAP_STYLE_ERROR",
"Invalid CSS name map style {0}");
static final DiagnosticType TOO_MANY_ARGUMENTS_ERROR = DiagnosticType.error(
"JSC_TOO_MANY_ARGUMENTS_ERROR",
"method \"{0}\" called with more than one argument");
static final DiagnosticType WEAK_NAMESPACE_TYPE = DiagnosticType.warning(
"JSC_WEAK_NAMESPACE_TYPE",
"Provided symbol declared with type Object. This is rarely useful. "
+ "For more information see "
+ "https://github.com/google/closure-compiler/wiki/A-word-about-the-type-Object");
static final DiagnosticType CLASS_NAMESPACE_ERROR = DiagnosticType.error(
"JSC_CLASS_NAMESPACE_ERROR",
"\"{0}\" cannot be both provided and declared as a class. Try var {0} = class '{'...'}'");
static final DiagnosticType FUNCTION_NAMESPACE_ERROR = DiagnosticType.error(
"JSC_FUNCTION_NAMESPACE_ERROR",
"\"{0}\" cannot be both provided and declared as a function");
static final DiagnosticType INVALID_PROVIDE_ERROR = DiagnosticType.error(
"JSC_INVALID_PROVIDE_ERROR",
"\"{0}\" is not a valid {1} qualified name");
static final DiagnosticType INVALID_DEFINE_NAME_ERROR = DiagnosticType.error(
"JSC_INVALID_DEFINE_NAME_ERROR",
"\"{0}\" is not a valid JS identifier name");
static final DiagnosticType MISSING_DEFINE_ANNOTATION = DiagnosticType.error(
"JSC_INVALID_MISSING_DEFINE_ANNOTATION",
"Missing @define annotation");
static final DiagnosticType XMODULE_REQUIRE_ERROR =
DiagnosticType.warning(
"JSC_XMODULE_REQUIRE_ERROR",
"namespace \"{0}\" is required in module {2} but provided in module {1}."
+ " Is module {2} missing a dependency on module {1}?");
static final DiagnosticType NON_STRING_PASSED_TO_SET_CSS_NAME_MAPPING_ERROR =
DiagnosticType.error(
"JSC_NON_STRING_PASSED_TO_SET_CSS_NAME_MAPPING_ERROR",
"goog.setCssNameMapping only takes an object literal with string values");
static final DiagnosticType INVALID_CSS_RENAMING_MAP = DiagnosticType.warning(
"INVALID_CSS_RENAMING_MAP",
"Invalid entries in css renaming map: {0}");
static final DiagnosticType BASE_CLASS_ERROR = DiagnosticType.error(
"JSC_BASE_CLASS_ERROR",
"incorrect use of {0}.base: {1}");
static final DiagnosticType CLOSURE_DEFINES_ERROR = DiagnosticType.error(
"JSC_CLOSURE_DEFINES_ERROR",
"Invalid CLOSURE_DEFINES definition");
static final DiagnosticType DEFINE_CALL_WITHOUT_ASSIGNMENT =
DiagnosticType.error(
"JSC_DEFINE_CALL_WITHOUT_ASSIGNMENT",
"The result of a goog.define call must be assigned as an isolated statement.");
static final DiagnosticType INVALID_FORWARD_DECLARE =
DiagnosticType.error("JSC_INVALID_FORWARD_DECLARE", "Malformed goog.forwardDeclare");
static final DiagnosticType CLOSURE_CALL_CANNOT_BE_ALIASED_ERROR =
DiagnosticType.error(
"JSC_CLOSURE_CALL_CANNOT_BE_ALIASED_ERROR",
"Closure primitive method {0} may not be aliased");
static final DiagnosticType CLOSURE_CALL_CANNOT_BE_ALIASED_OUTSIDE_MODULE_ERROR =
DiagnosticType.error(
"JSC_CLOSURE_CALL_CANNOT_BE_ALIASED_ERROR",
"Closure primitive method {0} may not be aliased outside a module (ES "
+ "module, CommonJS module, or goog.module)");
/** The root Closure namespace */
static final String GOOG = "goog";
private final AbstractCompiler compiler;
private final Set knownClosureSubclasses = new HashSet<>();
private final Set exportedVariables = new HashSet<>();
private final PreprocessorSymbolTable preprocessorSymbolTable;
private final List defineCalls = new ArrayList<>();
ProcessClosurePrimitives(
AbstractCompiler compiler, @Nullable PreprocessorSymbolTable preprocessorSymbolTable) {
this.compiler = compiler;
this.preprocessorSymbolTable = preprocessorSymbolTable;
}
Set getExportedVariableNames() {
return exportedVariables;
}
@Override
public void process(Node externs, Node root) {
// Replace and validate other Closure primitives
NodeTraversal.traverseRoots(compiler, this, externs, root);
for (Node n : defineCalls) {
replaceGoogDefines(n);
}
}
/**
* @param n
*/
private void replaceGoogDefines(Node n) {
Node parent = n.getParent();
String name = n.getSecondChild().getString();
Node value = n.getChildAtIndex(2).detach();
switch (parent.getToken()) {
case NAME:
parent.setDefineName(name);
n.replaceWith(value);
compiler.reportChangeToEnclosingScope(parent);
break;
case ASSIGN:
checkState(n == parent.getLastChild());
parent.getFirstChild().setDefineName(name);
n.replaceWith(value);
compiler.reportChangeToEnclosingScope(parent);
break;
default:
throw new IllegalStateException("goog.define outside of NAME, or ASSIGN");
}
}
@Override
public void hotSwapScript(Node scriptRoot, Node originalRoot) {
// TODO(bashir): Implement a real hot-swap version instead and make it fully
// consistent with the full version.
this.compiler.process(this);
}
@Override
public void visit(NodeTraversal t, Node n, Node parent) {
switch (n.getToken()) {
case CALL:
Node left = n.getFirstChild();
if (left.isGetProp()) {
Node name = left.getFirstChild();
if (name.isName() && GOOG.equals(name.getString())) {
// For the sake of simplicity, we report code changes
// when we see a provides/requires, and don't worry about
// reporting the change when we actually do the replacement.
String methodName = name.getNext().getString();
switch (methodName) {
case "define":
processDefineCall(t, n, parent);
break;
case "inherits":
// Note: inherits is allowed in local scope
processInheritsCall(n);
break;
case "exportSymbol":
// Note: exportSymbol is allowed in local scope
Node arg = left.getNext();
if (arg.isString()) {
String argString = arg.getString();
int dot = argString.indexOf('.');
if (dot == -1) {
exportedVariables.add(argString);
} else {
exportedVariables.add(argString.substring(0, dot));
}
}
break;
case "addDependency":
if (validateUnaliasablePrimitiveCall(t, n, methodName)) {
processAddDependency(n, parent);
}
break;
case "setCssNameMapping":
processSetCssNameMapping(n, parent);
break;
case "forwardDeclare":
if (validatePrimitiveCallWithMessage(
t,
n,
methodName,
ProcessClosurePrimitives.CLOSURE_CALL_CANNOT_BE_ALIASED_OUTSIDE_MODULE_ERROR)) {
processForwardDeclare(n);
}
break;
default: // fall out
}
} else if (left.getLastChild().getString().equals("base")) {
// maybe an "base" setup by goog.inherits
maybeProcessClassBaseCall(n);
}
}
break;
case ASSIGN:
case NAME:
if (n.isName() && n.getString().equals("CLOSURE_DEFINES")) {
handleClosureDefinesValues(n);
}
break;
default:
break;
}
}
/**
* Verifies that a) the call is in the top level of a file and b) the return value is unused
*
* This method is for primitives that never return a value.
*/
private boolean validateUnaliasablePrimitiveCall(NodeTraversal t, Node n, String methodName) {
return validatePrimitiveCallWithMessage(t, n, methodName, CLOSURE_CALL_CANNOT_BE_ALIASED_ERROR);
}
/**
* @param methodName list of primitive types classed together with this one
* @param invalidAliasingError which DiagnosticType to emit if this call is aliased. this depends
* on whether the primitive is sometimes aliasiable in a module or never aliasable.
*/
private boolean validatePrimitiveCallWithMessage(
NodeTraversal t, Node n, String methodName, DiagnosticType invalidAliasingError) {
// Ignore invalid primitives if we didn't strip module sugar.
if (compiler.getOptions().shouldPreserveGoogModule()) {
return true;
}
if (!t.inGlobalHoistScope() && !t.inModuleScope()) {
compiler.report(JSError.make(n, INVALID_CLOSURE_CALL_SCOPE_ERROR));
return false;
} else if (!n.getParent().isExprResult()
&& !t.inModuleScope()
&& !"goog.define".equals(methodName)) {
// If the call is in the global hoist scope, but the result is used
compiler.report(JSError.make(n, invalidAliasingError, GOOG + "." + methodName));
return false;
}
return true;
}
private void handleClosureDefinesValues(Node n) {
// var CLOSURE_DEFINES = {};
if (NodeUtil.isNameDeclaration(n.getParent())
&& n.hasOneChild()
&& n.getFirstChild().isObjectLit()) {
HashMap builder = new HashMap<>();
builder.putAll(compiler.getDefaultDefineValues());
for (Node c : n.getFirstChild().children()) {
if (c.isStringKey() && isValidDefineValue(c.getFirstChild())) {
builder.put(c.getString(), c.getFirstChild().cloneTree());
} else {
reportBadClosureCommonDefinesDefinition(c);
}
}
compiler.setDefaultDefineValues(ImmutableMap.copyOf(builder));
}
}
static boolean isValidDefineValue(Node val) {
switch (val.getToken()) {
case STRING:
case NUMBER:
case TRUE:
case FALSE:
return true;
case NEG:
return val.getFirstChild().isNumber();
default:
return false;
}
}
/** Handles a goog.define call. */
private void processDefineCall(NodeTraversal t, Node n, Node parent) {
Node left = n.getFirstChild();
Node args = left.getNext();
if (verifyDefine(t, parent, left, args)) {
Node nameNode = args;
maybeAddNameToSymbolTable(left);
maybeAddNameToSymbolTable(nameNode);
this.defineCalls.add(n);
}
}
private void maybeProcessClassBaseCall(Node n) {
// Two things must hold for every base call:
// 1) We must be calling it on "this".
// 2) We must be calling it on a prototype method of the same name as
// the one we're in, OR we must be calling it from a constructor.
// If both of those things are true, then we can rewrite:
//
// function Foo() {
// Foo.base(this);
// }
// goog.inherits(Foo, BaseFoo);
// Foo.prototype.bar = function() {
// Foo.base(this, 'bar', 1);
// };
//
// as the easy-to-optimize:
//
// function Foo() {
// BaseFoo.call(this);
// }
// goog.inherits(Foo, BaseFoo);
// Foo.prototype.bar = function() {
// Foo.superClass_.bar.call(this, 1);
// };
//
// Most of the logic here is just to make sure the AST's
// structure is what we expect it to be.
Node callTarget = n.getFirstChild();
Node baseContainerNode = callTarget.getFirstChild();
if (!baseContainerNode.isUnscopedQualifiedName()) {
// Some unknown "base" method.
return;
}
String baseContainer = callTarget.getFirstChild().getQualifiedName();
Node enclosingFnNameNode = getEnclosingDeclNameNode(n);
if (enclosingFnNameNode == null || !enclosingFnNameNode.isUnscopedQualifiedName()) {
// some unknown container method or a MEMBER_FUNCTION_DEF.
if (knownClosureSubclasses.contains(baseContainer)) {
reportBadBaseMethodUse(n, baseContainer, "Could not find enclosing method.");
} else if (baseUsedInClass(n)) {
Node clazz = NodeUtil.getEnclosingClass(n);
// TODO(lharker): this check ignores class expressions like "foo.Bar = class extends X {}"
if ((clazz.getFirstChild().isName()
&& clazz.getFirstChild().getString().equals(baseContainer))
|| (clazz.getSecondChild().isName()
&& clazz.getSecondChild().getString().equals(baseContainer))) {
reportBadBaseMethodUse(
n,
clazz.getFirstChild().getString(),
"base method is not allowed in ES6 class. Use super instead.");
}
}
return;
}
if (baseUsedInClass(n)) {
Node clazz = NodeUtil.getEnclosingClass(n);
String name = NodeUtil.getBestLValueName(clazz);
reportBadBaseMethodUse(
n, name, "base method is not allowed in ES6 class. Use super instead.");
return;
}
String enclosingQname = enclosingFnNameNode.getQualifiedName();
if (!enclosingQname.contains(".prototype.")) {
rewriteBaseCallInConstructor(enclosingQname, baseContainer, n, enclosingFnNameNode);
} else {
rewriteBaseCallInMethod(enclosingQname, baseContainer, n, enclosingFnNameNode);
}
}
private void rewriteBaseCallInConstructor(
String enclosingQname, String baseContainer, Node n, Node enclosingFnNameNode) {
// Check if this is some other "base" method.
if (!enclosingQname.equals(baseContainer)) {
// Report misuse of "base" methods from other known classes.
if (knownClosureSubclasses.contains(baseContainer)) {
reportBadBaseMethodUse(
n, baseContainer, "Must be used within " + baseContainer + " methods");
}
return;
}
// Determine if this is a class with a "base" method created by
// goog.inherits.
Node enclosingParent = enclosingFnNameNode.getParent();
Node baseClassNode =
findGoogInheritsCall(
enclosingParent.isAssign() ? enclosingParent.getParent() : enclosingParent);
if (baseClassNode == null) {
// If there is no "goog.inherits", this might be some other "base" method.
return;
}
// This is the expected method, validate its parameters.
Node callee = n.getFirstChild();
Node thisArg = callee.getNext();
if (thisArg == null || !thisArg.isThis()) {
reportBadBaseMethodUse(n, baseContainer, "First argument must be 'this'.");
return;
}
// Handle methods.
Node methodNameNode = thisArg.getNext();
if (methodNameNode == null
|| !methodNameNode.isString()
|| !methodNameNode.getString().equals("constructor")) {
reportBadBaseMethodUse(n, baseContainer, "Second argument must be 'constructor'.");
return;
}
// We're good to go.
n.replaceChild(
callee,
NodeUtil.newQName(
compiler,
baseClassNode.getQualifiedName() + ".call",
callee,
enclosingQname + ".base"));
n.removeChild(methodNameNode);
compiler.reportChangeToEnclosingScope(n);
}
private void rewriteBaseCallInMethod(
String enclosingQname, String baseContainer, Node n, Node enclosingFnNameNode) {
if (!knownClosureSubclasses.contains(baseContainer)) {
// Can't determine if this is a known "class" that has a known "base" method.
return;
}
boolean misuseOfBase =
!enclosingFnNameNode.getFirstFirstChild().matchesQualifiedName(baseContainer);
if (misuseOfBase) {
// Report misuse of "base" methods from other known classes.
reportBadBaseMethodUse(n, baseContainer, "Must be used within " + baseContainer + " methods");
return;
}
// The super class is known.
Node callee = n.getFirstChild();
Node thisArg = callee.getNext();
if (thisArg == null || !thisArg.isThis()) {
reportBadBaseMethodUse(n, baseContainer, "First argument must be 'this'.");
return;
}
// Handle methods.
Node methodNameNode = thisArg.getNext();
if (methodNameNode == null || !methodNameNode.isString()) {
reportBadBaseMethodUse(n, baseContainer, "Second argument must name a method.");
return;
}
String methodName = methodNameNode.getString();
String ending = ".prototype." + methodName;
if (enclosingQname == null || !enclosingQname.endsWith(ending)) {
reportBadBaseMethodUse(n, baseContainer, "Enclosing method does not match " + methodName);
return;
}
// We're good to go.
Node className = enclosingFnNameNode.getFirstFirstChild();
n.replaceChild(
callee,
NodeUtil.newQName(
compiler,
className.getQualifiedName() + ".superClass_." + methodName + ".call",
callee,
enclosingQname + ".base"));
n.removeChild(methodNameNode);
compiler.reportChangeToEnclosingScope(n);
}
private static Node findGoogInheritsCall(Node ctorDeclarationNode) {
Node maybeInheritsExpr = ctorDeclarationNode.getNext();
while (maybeInheritsExpr != null
&& (maybeInheritsExpr.isEmpty() || NodeUtil.isExprAssign(maybeInheritsExpr))) {
// Skip empty nodes (e.g. those created by an unnecessary semicolon) and potential aliases,
// e.g. "exports = Ctor;" in a goog.module.
maybeInheritsExpr = maybeInheritsExpr.getNext();
}
Node baseClassNode = null;
if (maybeInheritsExpr != null && NodeUtil.isExprCall(maybeInheritsExpr)) {
Node callNode = maybeInheritsExpr.getFirstChild();
if (callNode.getFirstChild().matchesQualifiedName("goog.inherits")
&& callNode.getLastChild().isQualifiedName()) {
baseClassNode = callNode.getLastChild();
}
}
return baseClassNode;
}
/**
* Processes the goog.inherits call.
*/
private void processInheritsCall(Node n) {
if (n.hasXChildren(3)) {
Node subClass = n.getSecondChild();
Node superClass = subClass.getNext();
if (subClass.isUnscopedQualifiedName() && superClass.isUnscopedQualifiedName()) {
knownClosureSubclasses.add(subClass.getQualifiedName());
}
}
}
/**
* Returns the qualified name node of the function whose scope we're in,
* or null if it cannot be found.
*/
private static Node getEnclosingDeclNameNode(Node n) {
Node fn = NodeUtil.getEnclosingFunction(n);
return fn == null ? null : NodeUtil.getNameNode(fn);
}
/** Verify if goog.base call is used in a class */
private static boolean baseUsedInClass(Node n) {
for (Node curr = n; curr != null; curr = curr.getParent()){
if (curr.isClassMembers()) {
return true;
}
}
return false;
}
/** Reports an incorrect use of super-method calling. */
private void reportBadBaseMethodUse(Node n, String className, String extraMessage) {
compiler.report(JSError.make(n, BASE_CLASS_ERROR, className, extraMessage));
}
/** Reports an incorrect CLOSURE_DEFINES definition. */
private void reportBadClosureCommonDefinesDefinition(Node n) {
compiler.report(JSError.make(n, CLOSURE_DEFINES_ERROR));
}
/**
* Processes a call to goog.setCssNameMapping(). Either the argument to goog.setCssNameMapping()
* is valid, in which case it will be used to create a CssRenamingMap for the compiler of this
* CompilerPass, or it is invalid and a JSCompiler error will be reported.
*
* @see #visit(NodeTraversal, Node, Node)
*/
private void processSetCssNameMapping(Node n, Node parent) {
Node left = n.getFirstChild();
Node arg = left.getNext();
if (verifySetCssNameMapping(left, arg)) {
// Translate OBJECTLIT into SubstitutionMap. All keys and
// values must be strings, or an error will be thrown.
final Map cssNames = new HashMap<>();
for (Node key = arg.getFirstChild(); key != null;
key = key.getNext()) {
Node value = key.getFirstChild();
if (!key.isStringKey()
|| value == null
|| !value.isString()) {
compiler.report(JSError.make(n, NON_STRING_PASSED_TO_SET_CSS_NAME_MAPPING_ERROR));
return;
}
cssNames.put(key.getString(), value.getString());
}
String styleStr = "BY_PART";
if (arg.getNext() != null) {
styleStr = arg.getNext().getString();
}
final CssRenamingMap.Style style;
try {
style = CssRenamingMap.Style.valueOf(styleStr);
} catch (IllegalArgumentException e) {
compiler.report(JSError.make(n, INVALID_STYLE_ERROR, styleStr));
return;
}
if (style == CssRenamingMap.Style.BY_PART) {
// Make sure that no keys contain -'s
List errors = new ArrayList<>();
for (String key : cssNames.keySet()) {
if (key.contains("-")) {
errors.add(key);
}
}
if (!errors.isEmpty()) {
compiler.report(JSError.make(n, INVALID_CSS_RENAMING_MAP, errors.toString()));
}
} else if (style == CssRenamingMap.Style.BY_WHOLE) {
// Verifying things is a lot trickier here. We just do a quick
// n^2 check over the map which makes sure that if "a-b" in
// the map, then map(a-b) = map(a)-map(b).
// To speed things up, only consider cases where len(b) <= 10
List errors = new ArrayList<>();
for (Map.Entry b : cssNames.entrySet()) {
if (b.getKey().length() > 10) {
continue;
}
for (Map.Entry a : cssNames.entrySet()) {
String combined = cssNames.get(a.getKey() + "-" + b.getKey());
if (combined != null && !combined.equals(a.getValue() + "-" + b.getValue())) {
errors.add("map(" + a.getKey() + "-" + b.getKey() + ") != map("
+ a.getKey() + ")-map(" + b.getKey() + ")");
}
}
}
if (!errors.isEmpty()) {
compiler.report(JSError.make(n, INVALID_CSS_RENAMING_MAP, errors.toString()));
}
}
CssRenamingMap cssRenamingMap = new CssRenamingMap() {
@Override
public String get(String value) {
if (cssNames.containsKey(value)) {
return cssNames.get(value);
} else {
return value;
}
}
@Override
public CssRenamingMap.Style getStyle() {
return style;
}
};
compiler.setCssRenamingMap(cssRenamingMap);
compiler.reportChangeToEnclosingScope(parent);
parent.detach();
}
}
/**
* Verifies that a goog.define method call has exactly two arguments, with the first a string
* literal whose contents is a valid JS qualified name. Reports a compile error if it doesn't.
*
* @return Whether the argument checked out okay
*/
private boolean verifyDefine(NodeTraversal t, Node parent, Node methodName, Node args) {
// Calls to goog.define must be in the global hoist scope. This is copied from
// validate(Un)aliasablePrimitiveCall.
// TODO(sdh): loosen this restriction if the results are assigned?
if (!compiler.getOptions().shouldPreserveGoogModule()
&& !t.inGlobalHoistScope()
&& !t.inModuleScope()) {
compiler.report(JSError.make(methodName.getParent(), INVALID_CLOSURE_CALL_SCOPE_ERROR));
return false;
}
// It is an error for goog.define to show up anywhere except immediately after =.
if (parent.isAssign() && parent.getParent().isExprResult()) {
parent = parent.getParent();
} else if (parent.isName() && NodeUtil.isNameDeclaration(parent.getParent())) {
parent = parent.getParent();
} else {
compiler.report(JSError.make(methodName.getParent(), DEFINE_CALL_WITHOUT_ASSIGNMENT));
return false;
}
// Verify first arg
Node arg = args;
if (!verifyNotNull(methodName, arg) || !verifyOfType(methodName, arg, Token.STRING)) {
return false;
}
// Verify second arg
arg = arg.getNext();
if (!args.isFromExterns()
&& (!verifyNotNull(methodName, arg) || !verifyIsLast(methodName, arg))) {
return false;
}
String name = args.getString();
if (!NodeUtil.isValidQualifiedName(
compiler.getOptions().getLanguageIn().toFeatureSet(), name)) {
compiler.report(JSError.make(args, INVALID_DEFINE_NAME_ERROR, name));
return false;
}
JSDocInfo info = (parent.isExprResult() ? parent.getFirstChild() : parent).getJSDocInfo();
if (info == null || !info.isDefine()) {
compiler.report(JSError.make(parent, MISSING_DEFINE_ANNOTATION));
return false;
}
return true;
}
/**
* Process a goog.addDependency() call and record any forward declarations.
*/
private void processAddDependency(Node n, Node parent) {
CodingConvention convention = compiler.getCodingConvention();
List typeDecls =
convention.identifyTypeDeclarationCall(n);
// TODO(nnaze): Use of addDependency() should someday cause a warning
// as we migrate users to explicit goog.forwardDeclare() calls.
if (typeDecls != null) {
for (String typeDecl : typeDecls) {
compiler.forwardDeclareType(typeDecl);
}
}
// We can't modify parent, so just create a node that will
// get compiled out.
Node emptyNode = IR.number(0);
parent.replaceChild(n, emptyNode);
compiler.reportChangeToEnclosingScope(emptyNode);
}
/** Process a goog.forwardDeclare() call and record the specified forward declaration. */
private void processForwardDeclare(Node n) {
if (!n.getParent().isExprResult()) {
// Ignore "const Foo = goog.forwardDeclare('my.Foo');". It's legal but does not actually
// forward declare the type 'my.Foo'.
return;
}
CodingConvention convention = compiler.getCodingConvention();
String typeDeclaration = null;
try {
typeDeclaration = Iterables.getOnlyElement(
convention.identifyTypeDeclarationCall(n));
} catch (NullPointerException | NoSuchElementException | IllegalArgumentException e) {
compiler.report(
JSError.make(
n,
INVALID_FORWARD_DECLARE,
"A single type could not identified for the goog.forwardDeclare statement"));
}
if (typeDeclaration != null) {
compiler.forwardDeclareType(typeDeclaration);
}
}
/** @return Whether the argument checked out okay */
private boolean verifyNotNull(Node methodName, Node arg) {
if (arg == null) {
compiler.report(JSError.make(methodName, NULL_ARGUMENT_ERROR, methodName.getQualifiedName()));
return false;
}
return true;
}
/** @return Whether the argument checked out okay */
private boolean verifyOfType(Node methodName, Node arg, Token desiredType) {
if (arg.getToken() != desiredType) {
compiler.report(
JSError.make(methodName, INVALID_ARGUMENT_ERROR, methodName.getQualifiedName()));
return false;
}
return true;
}
/** @return Whether the argument checked out okay */
private boolean verifyIsLast(Node methodName, Node arg) {
if (arg.getNext() != null) {
compiler.report(
JSError.make(methodName, TOO_MANY_ARGUMENTS_ERROR, methodName.getQualifiedName()));
return false;
}
return true;
}
/**
* Verifies that setCssNameMapping is called with the correct methods.
*
* @return Whether the arguments checked out okay
*/
private boolean verifySetCssNameMapping(Node methodName, Node firstArg) {
DiagnosticType diagnostic = null;
if (firstArg == null) {
diagnostic = NULL_ARGUMENT_ERROR;
} else if (!firstArg.isObjectLit()) {
diagnostic = EXPECTED_OBJECTLIT_ERROR;
} else if (firstArg.getNext() != null) {
Node secondArg = firstArg.getNext();
if (!secondArg.isString()) {
diagnostic = EXPECTED_STRING_ERROR;
} else if (secondArg.getNext() != null) {
diagnostic = TOO_MANY_ARGUMENTS_ERROR;
}
}
if (diagnostic != null) {
compiler.report(JSError.make(methodName, diagnostic, methodName.getQualifiedName()));
return false;
}
return true;
}
/** Add the given qualified name node to the symbol table. */
private void maybeAddNameToSymbolTable(Node name) {
if (preprocessorSymbolTable != null) {
preprocessorSymbolTable.addReference(name);
}
}
}