Make server components of inline comment content handling state-oriented

Summary: Ref T13513. Introduce a formal server-side content state object so the whole state can be saved and restored to the drafts table, read from the request, etc.

Test Plan: Created and edited inlines. Reloaded drafts with edits. Submitted normal and editing comments. Grepped for affected symbols.

Maniphest Tasks: T13513

Differential Revision: https://secure.phabricator.com/D21275

src/infrastructure/diff/inline/PhabricatorDiffInlineCommentContentState.php

@@ -0,0 +1,69 @@
+<?php
+
+final class PhabricatorDiffInlineCommentContentState
+  extends PhabricatorInlineCommentContentState {
+
+  private $hasSuggestion = false;
+  private $suggestionText = '';
+
+  public function isEmptyContentState() {
+    if (!parent::isEmptyContentState()) {
+      return false;
+    }
+
+    if ($this->getContentHasSuggestion()) {
+      if (strlen($this->getSuggestionText())) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  public function setContentSuggestionText($suggestion_text) {
+    $this->suggestionText = $suggestion_text;
+    return $this;
+  }
+
+  public function getContentSuggestionText() {
+    return $this->suggestionText;
+  }
+
+  public function setContentHasSuggestion($has_suggestion) {
+    $this->hasSuggestion = $has_suggestion;
+    return $this;
+  }
+
+  public function getContentHasSuggestion() {
+    return $this->hasSuggestion;
+  }
+
+  public function newStorageMap() {
+    return parent::writeStorageMap() + array(
+      'hasSuggestion' => $this->getContentHasSuggestion(),
+      'suggestionText' => $this->getContentSuggestionText(),
+    );
+  }
+
+  public function readStorageMap(array $map) {
+    $result = parent::readStorageMap($map);
+
+    $has_suggestion = (bool)idx($map, 'hasSuggestion');
+    $this->setContentHasSuggestion($has_suggestion);
+
+    $suggestion_text = (string)idx($map, 'suggestionText');
+    $this->setContentSuggestionText($suggestion_text);
+
+    return $result;
+  }
+
+  protected function newStorageMapFromRequest(AphrontRequest $request) {
+    $map = parent::newStorageMapFromRequest($request);
+
+    $map['hasSuggestion'] = (bool)$request->getBool('hasSuggestion');
+    $map['suggestionText'] = (string)$request->getStr('suggestionText');
+
+    return $map;
+  }
+
+}