HTML parser: Add show/toString() debug helper methods

third_party/WebKit/Source/core/html/parser/AtomicHTMLToken.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/html/parser/AtomicHTMLToken.h"
 
 namespace blink {
 
 QualifiedName AtomicHTMLToken::nameForAttribute(const HTMLToken::Attribute& attribute) const
 {
     return QualifiedName(nullAtom, attribute.name(), nullAtom);
 }
 
 bool AtomicHTMLToken::usesName() const
 {
     return m_type == HTMLToken::StartTag || m_type == HTMLToken::EndTag || m_type == HTMLToken::DOCTYPE;
 }
 
 bool AtomicHTMLToken::usesAttributes() const
 {
     return m_type == HTMLToken::StartTag || m_type == HTMLToken::EndTag;
 }
 
+#ifndef NDEBUG
+const char* toString(HTMLToken::TokenType type)
+{
+    switch (type) {
+#define DEFINE_STRINGIFY(type) case HTMLToken::type: return #type;
+        DEFINE_STRINGIFY(Uninitialized);
+        DEFINE_STRINGIFY(DOCTYPE);
+        DEFINE_STRINGIFY(StartTag);
+        DEFINE_STRINGIFY(EndTag);
+        DEFINE_STRINGIFY(Comment);
+        DEFINE_STRINGIFY(Character);
+        DEFINE_STRINGIFY(EndOfFile);
+#undef DEFINE_STRINGIFY
+    }
+    return "<unknown>";
+}
+
+void AtomicHTMLToken::show() const
+{
+    printf("AtomicHTMLToken %s", toString(m_type));
+    switch (m_type) {
+    case HTMLToken::StartTag:
+    case HTMLToken::EndTag:
+        if (m_selfClosing)
+            printf(" selfclosing");
+        /* FALL THROUGH */
+    case HTMLToken::DOCTYPE:
+        printf(" name \"%s\"", m_name.getString().utf8().data());
+        break;
+    case HTMLToken::Comment:
+    case HTMLToken::Character:
+        printf(" data \"%s\"", m_data.utf8().data());
+        break;
+    default:
+        break;
+    }
+    // TODO(kouhei): print m_attributes?
+    printf("\n");
+}
+#endif
+
 } // namespace blink