com.google.javascript.jscomp.TypeInfoCheck Maven / Gradle / Ivy
/*
* Copyright 2017 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 com.google.javascript.jscomp.NodeTraversal.Callback;
import com.google.javascript.rhino.IR;
import com.google.javascript.rhino.Node;
/** A simple pass to ensure that all AST nodes that are expressions have types */
final class TypeInfoCheck implements Callback, CompilerPass {
private final AbstractCompiler compiler;
private boolean requiresTypes = false;
TypeInfoCheck(AbstractCompiler compiler) {
this.compiler = compiler;
}
public void setCheckSubTree(Node root) {
requiresTypes = true;
NodeTraversal.traverse(compiler, root, this);
}
@Override
public void process(Node externs, Node root) {
requiresTypes = false;
NodeTraversal.traverse(compiler, root, this);
}
@Override
public boolean shouldTraverse(NodeTraversal nodeTraversal, Node n, Node parent) {
if (n.isScript()) {
// Each JavaScript file is rooted in a script node, so we'll only
// have type information inside the script node.
requiresTypes = true;
} else if (n.isParamList()) {
// typeI information is not included for children of PARAM_LIST,
// so we turn off requireTypes for these nodes.
requiresTypes = false;
}
return true;
}
@Override
public void visit(NodeTraversal nodeTraversal, Node n, Node parent) {
if (n.isScript()) {
requiresTypes = false;
} else if (requiresTypes && shouldHaveTypeInformation(n)) {
if (n.isString() && (parent.isGetProp() || parent.isGetElem())) {
return;
}
if (n.isParamList()) {
return;
}
if (n.isName() && parent.isFunction()) {
// function names does not need to have type information.
return;
}
if (n.getJSType() == null) {
throw new IllegalStateException(
"No type information associated with "
+ n
+ " Most likely a Node has been created after type checking"
+ " without setting the type.");
}
}
}
private static boolean shouldHaveTypeInformation(Node node) {
return node.isFunction() || !IR.mayBeStatement(node);
}
}