feat(simplifier): can be configured to return empty comment (#541)

Allow simplifier to return empty comment by setting `simplifier/inherit_comment: false`

Co-authored-by: 居戎氏 <chen.sst@gmail.com>

Author: LEOYoon-Tsaw

src/rime/candidate.h

@@ -88,16 +88,17 @@ class ShadowCandidate : public Candidate {
   ShadowCandidate(const an<Candidate>& item,
                   const string& type,
                   const string& text = string(),
-                  const string& comment = string())
+                  const string& comment = string(),
+                  const bool inherit_comment = true)
       : Candidate(type, item->start(), item->end(), item->quality()),
         text_(text), comment_(comment),
-        item_(item) {}
+        item_(item), inherit_comment_(inherit_comment) {}
 
   const string& text() const {
     return text_.empty() ? item_->text() : text_;
   }
   string comment() const {
-    return comment_.empty() ? item_->comment() : comment_;
+    return inherit_comment_ && comment_.empty() ? item_->comment() : comment_;
   }
   string preedit() const {
     return item_->preedit();
@@ -109,6 +110,7 @@ class ShadowCandidate : public Candidate {
   string text_;
   string comment_;
   an<Candidate> item_;
+  bool inherit_comment_;
 };
 
 class UniquifiedCandidate : public Candidate {

src/rime/gear/simplifier.cc

@@ -108,6 +108,7 @@ Simplifier::Simplifier(const Ticket& ticket) : Filter(ticket),
                     (tips == "char") ? kTipsChar : kTipsNone;
     }
     config->GetBool(name_space_ + "/show_in_comment", &show_in_comment_);
+    config->GetBool(name_space_ + "/inherit_comment", &inherit_comment_);
     comment_formatter_.Load(config->GetList(name_space_ + "/comment_format"));
     config->GetBool(name_space_ + "/random", &random_);
     config->GetString(name_space_ + "/option_name", &option_name_);
@@ -225,7 +226,8 @@ void Simplifier::PushBack(const an<Candidate>& original,
           original,
           "simplified",
           text,
-          tips));
+          tips,
+          inherit_comment_));
 }
 
 bool Simplifier::Convert(const an<Candidate>& original,

src/rime/gear/simplifier.h

@@ -46,6 +46,7 @@ class Simplifier : public Filter, TagMatching {
   string opencc_config_;
   set<string> excluded_types_;
   bool show_in_comment_ = false;
+  bool inherit_comment_ = true;
   Projection comment_formatter_;
   bool random_ = false;
 };