1 files changed, 104 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/profiler/output/HtmlPrinter.java b/src/main/java/com/google/devtools/build/lib/profiler/output/HtmlPrinter.java
new file mode 100644
index 0000000000..531e0f6fa0
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/profiler/output/HtmlPrinter.java
@@ -0,0 +1,104 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// 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.devtools.build.lib.profiler.output;
+
+import java.io.PrintStream;
+import java.util.ArrayDeque;
+import java.util.Deque;
+
+/**
+ * Utility function for writing HTML data to a {@link PrintStream}.
+ */
+public abstract class HtmlPrinter extends TextPrinter {
+
+  private Deque<String> currentlyOpenTags;
+
+  protected HtmlPrinter(PrintStream out) {
+    super(out);
+    currentlyOpenTags = new ArrayDeque<>();
+  }
+
+  /**
+   * Print an open tag with attributes and possibly content and increase indentation level.
+   *
+   * <p>All array elements are taken in pairs for attributes and their values. If odd, the last
+   *  element is taken as the content of the element. It is printed directly after the opening tag.
+   * @param attributesAndContent must have the form: attribute1, value1, attribute2, value2, ...,
+   *    content
+   */
+  protected void open(String tag, Object... attributesAndContent) {
+    printf("<%s", tag);
+    for (int index = 0; index < attributesAndContent.length - 1; index += 2) {
+      printf(" %s=\"%s\"", attributesAndContent[index], attributesAndContent[index + 1]);
+    }
+    print(">");
+    if (attributesAndContent.length % 2 == 1) {
+      print(attributesAndContent[attributesAndContent.length - 1]);
+    }
+    down();
+    currentlyOpenTags.addFirst(tag);
+  }
+
+  /**
+   * Print a newline, an open tag with attributes and possibly content and increase indentation
+   * level
+   * @see #open(String, Object...)
+   */
+  protected void lnOpen(String tag, Object... attributes) {
+    lnIndent();
+    open(tag, attributes);
+  }
+
+  /**
+   * Decrease indentation level and close the most recently opened tag
+   */
+  protected void close() {
+    up();
+    printf("</%s>", currentlyOpenTags.pop());
+  }
+
+  /**
+   * Decrease indentation level, print newline, indentation and close the most recently opened tag
+   */
+  protected void lnClose() {
+    up();
+    lnPrintf("</%s>", currentlyOpenTags.pop());
+  }
+
+  protected void lnElement(String tag, Object content) {
+    lnIndent();
+    element(tag, content);
+  }
+
+  /**
+   * Print a single element with attributes and possibly content.
+   *
+   * @see #open(String, Object...)
+   */
+  protected void element(String tag, Object... attributesAndContent) {
+    open(tag, attributesAndContent);
+    close();
+  }
+
+  /**
+   * Print a newline, indent and a single element with attributes and possibly content.
+   *
+   * @see #lnOpen(String, Object...)
+   */
+  protected void lnElement(String tag, Object... attributesAndContent) {
+    lnOpen(tag, attributesAndContent);
+    close();
+  }
+}
+