AutoFill: Copy FormManager::LabelForElement and the corresponding

FormManager::InferLabelForElement to form_field.cc until the
FormData/FormFieldValues consolidation is finished.

BUG=33031
TEST=none

Review URL: http://codereview.chromium.org/1394003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42730 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 73 insertions, 4 deletions

diff --git a/webkit/glue/form_field.cc b/webkit/glue/form_field.cc
index 721b3a7..7717dea 100644
--- a/webkit/glue/form_field.cc
+++ b/webkit/glue/form_field.cc
@@ -6,8 +6,80 @@
 
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebDocument.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebElement.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebLabelElement.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebNode.h"
+#include "third_party/WebKit/WebKit/chromium/public/WebNodeList.h"
 
+using WebKit::WebElement;
+using WebKit::WebLabelElement;
 using WebKit::WebInputElement;
+using WebKit::WebNode;
+using WebKit::WebNodeList;
+
+// TODO(jhawkins): Remove the following methods once AutoFill has been switched
+// over to using FormData.
+// WARNING: This code must stay in sync with the corresponding code in
+// FormManager until we can remove this.
+namespace {
+
+string16 InferLabelForElement(const WebInputElement& element) {
+  string16 inferred_label;
+  WebNode previous = element.previousSibling();
+  if (!previous.isNull()) {
+    if (previous.isTextNode()) {
+      inferred_label = previous.nodeValue();
+      TrimWhitespace(inferred_label, TRIM_ALL, &inferred_label);
+    }
+
+    // If we didn't find text, check for previous paragraph.
+    // Eg. <p>Some Text</p><input ...>
+    // Note the lack of whitespace between <p> and <input> elements.
+    if (inferred_label.empty()) {
+      if (previous.isElementNode()) {
+        WebElement element = previous.toElement<WebElement>();
+        if (element.hasTagName("p")) {
+          inferred_label = element.innerText();
+          TrimWhitespace(inferred_label, TRIM_ALL, &inferred_label);
+        }
+      }
+    }
+
+    // If we didn't find paragraph, check for previous paragraph to this.
+    // Eg. <p>Some Text</p>   <input ...>
+    // Note the whitespace between <p> and <input> elements.
+    if (inferred_label.empty()) {
+      previous = previous.previousSibling();
+      if (!previous.isNull() && previous.isElementNode()) {
+        WebElement element = previous.toElement<WebElement>();
+        if (element.hasTagName("p")) {
+          inferred_label = element.innerText();
+          TrimWhitespace(inferred_label, TRIM_ALL, &inferred_label);
+        }
+      }
+    }
+  }
+
+  return inferred_label;
+}
+
+string16 LabelForElement(const WebInputElement& element) {
+  WebNodeList labels = element.document().getElementsByTagName("label");
+  for (unsigned i = 0; i < labels.length(); ++i) {
+    WebElement e = labels.item(i).toElement<WebElement>();
+    if (e.hasTagName("label")) {
+      WebLabelElement label = e.toElement<WebLabelElement>();
+      if (label.correspondingControl() == element)
+        return label.innerText();
+    }
+  }
+
+  // Infer the label from context if not found in label element.
+  return InferLabelForElement(element);
+}
+
+}  // namespace
 
 namespace webkit_glue {
 
@@ -16,10 +88,7 @@ FormField::FormField() {
 
 FormField::FormField(const WebInputElement& input_element) {
   name_ = input_element.nameForAutofill();
-
-  // TODO(jhawkins): Extract the field label.  For now we just use the field
-  // name.
-  label_ = name_;
+  label_ = LabelForElement(input_element);
 
   value_ = input_element.value();
   TrimWhitespace(value_, TRIM_LEADING, &value_);