Issue 4048. Support for revised library/import syntax

compiler/java/com/google/dart/compiler/ast/LibraryImport.java

Index: compiler/java/com/google/dart/compiler/ast/LibraryImport.java
diff --git a/compiler/java/com/google/dart/compiler/ast/LibraryImport.java b/compiler/java/com/google/dart/compiler/ast/LibraryImport.java
index e14f6c8be314b3dc0224b21855e30c89401f1151..e6f32f557768403c2c508d200b7b0ed18bd334b3 100644
--- a/compiler/java/com/google/dart/compiler/ast/LibraryImport.java
+++ b/compiler/java/com/google/dart/compiler/ast/LibraryImport.java
@@ -5,17 +5,28 @@
 package com.google.dart.compiler.ast;
 
 import com.google.common.base.Objects;
+import com.google.common.collect.Sets;
+
+import java.util.List;
+import java.util.Set;
 
 /**
  * Information about import - prefix and {@link LibraryUnit}.
  */
 public class LibraryImport {
-  private final String prefix;
   private final LibraryUnit library;
+  private final String prefix;
+  private final Set<String> showNames;
+  private final Set<String> hideNames;
+  private final boolean exported;
 
-  public LibraryImport(String prefix, LibraryUnit library) {
-    this.prefix = prefix;
+  public LibraryImport(LibraryUnit library, String prefix, List<ImportCombinator> combinators,
+      boolean exported) {
     this.library = library;
+    this.prefix = prefix;
+    this.showNames = createCombinatorsSet(combinators, true);
+    this.hideNames = createCombinatorsSet(combinators, false);
+    this.exported = exported;
   }
 
   @Override
@@ -27,16 +38,57 @@ public class LibraryImport {
   public boolean equals(Object obj) {
     if (obj instanceof LibraryImport) {
       LibraryImport other = (LibraryImport) obj;
-      return Objects.equal(prefix, other.prefix) && Objects.equal(library, other.library);
+      return Objects.equal(library, other.library) && Objects.equal(prefix, other.prefix)
+          && Objects.equal(showNames, other.showNames) && Objects.equal(hideNames, other.hideNames)
+          && exported == other.exported;
     }
     return false;
   }
 
+  public LibraryUnit getLibrary() {
+    return library;
+  }
+
   public String getPrefix() {
     return prefix;
   }
+  
+  public boolean isVisible(String name) {
+    if (hideNames.contains(name)) {
+      return false;
+    }
+    if (!showNames.isEmpty()) {
+      return showNames.contains(name);
+    }
+    return true;
+  }
 
-  public LibraryUnit getLibrary() {
-    return library;
+  public boolean isExported() {
+    return exported;
+  }
+
+  private static Set<String> createCombinatorsSet(List<ImportCombinator> combinators, boolean show) {
+    Set<String> result = Sets.newHashSet();
+    for (ImportCombinator combinator : combinators) {
+      // show
+      if (show && combinator instanceof ImportShowCombinator) {
+        ImportShowCombinator showCombinator = (ImportShowCombinator) combinator;
+        for (DartIdentifier showName : showCombinator.getShownNames()) {
+          if (showName != null) {
+            result.add(showName.getName());
+          }
+        }
+      }
+      // hide
+      if (!show && combinator instanceof ImportHideCombinator) {
+        ImportHideCombinator hideCombinator = (ImportHideCombinator) combinator;
+        for (DartIdentifier hideName : hideCombinator.getHiddenNames()) {
+          if (hideName != null) {
+            result.add(hideName.getName());
+          }
+        }
+      }
+    }
+    return result;
   }
 }