Add support for compose string (#58)

Fix #54

src/unix/fcitx5/fcitx_key_event_handler.cc

@@ -30,12 +30,15 @@
 
 #include "unix/fcitx5/fcitx_key_event_handler.h"
 
+#include <fcitx-utils/charutils.h>
 #include <fcitx-utils/key.h>
+#include <fcitx-utils/utf8.h>
 
 #include <cstdint>
 #include <map>
 #include <memory>
 #include <set>
+#include <string>
 
 #include "absl/log/check.h"
 #include "absl/log/log.h"
@@ -124,6 +127,24 @@ bool KeyEventHandler::GetKeyEvent(
   return ProcessModifiers(is_key_up, keyval, key);
 }
 
+bool KeyEventHandler::GetKeyEvent(
+    const std::string &composeString,
+    mozc::config::Config::PreeditMethod preedit_method, bool layout_is_jp,
+    mozc::commands::KeyEvent *key) {
+  key->Clear();
+  auto length = utf8::length(composeString);
+  if (length == 1) {
+    auto chr = utf8::getChar(composeString);
+    // For ascii key & yen, use the regular key event conversion.
+    if ((chr >= 0x20 && chr <= 0x7e) || chr == 0xa5) {
+      return GetKeyEvent(static_cast<KeySym>(chr), 0, KeyStates(),
+                         preedit_method, layout_is_jp, false, key);
+    }
+  }
+  key->set_key_string(composeString);
+  return true;
+}
+
 void KeyEventHandler::Clear() {
   is_non_modifier_key_pressed_ = false;
   currently_pressed_modifiers_.clear();

src/unix/fcitx5/fcitx_key_event_handler.h

@@ -56,6 +56,10 @@ class KeyEventHandler {
                    bool layout_is_jp, bool is_key_up,
                    mozc::commands::KeyEvent *key);
 
+  bool GetKeyEvent(const std::string &composeString,
+                   mozc::config::Config::PreeditMethod preedit_method,
+                   bool layout_is_jp, mozc::commands::KeyEvent *key);
+
   // Clears states.
   void Clear();
 

src/unix/fcitx5/mozc_state.cc

@@ -34,6 +34,7 @@
 #include <fcitx-utils/keysym.h>
 #include <fcitx-utils/log.h>
 #include <fcitx-utils/stringutils.h>
+#include <fcitx-utils/utf8.h>
 #include <fcitx/candidatelist.h>
 #include <fcitx/event.h>
 #include <fcitx/inputpanel.h>
@@ -42,6 +43,7 @@
 
 #include <cstdint>
 #include <memory>
+#include <optional>
 #include <string>
 #include <utility>
 
@@ -109,10 +111,10 @@ void MozcState::UpdatePreeditMethod() {
   }
 }
 
-bool MozcState::TrySendKeyEvent(
-    InputContext* ic, KeySym sym, uint32_t keycode, KeyStates state,
-    mozc::commands::CompositionMode composition_mode, bool layout_is_jp,
-    bool is_key_up, mozc::commands::Output* out, std::string* out_error) const {
+bool MozcState::TrySendKeyEvent(InputContext* ic,
+                                const mozc::commands::KeyEvent& event,
+                                mozc::commands::Output* out,
+                                std::string* out_error) const {
   DCHECK(out);
   DCHECK(out_error);
 
@@ -125,13 +127,7 @@ bool MozcState::TrySendKeyEvent(
     return false;
   }
 
-  mozc::commands::KeyEvent event;
-  if (!handler_->GetKeyEvent(sym, keycode, state, preedit_method_, layout_is_jp,
-                             is_key_up, &event)) {
-    return false;
-  }
-
-  if ((composition_mode == mozc::commands::DIRECT) &&
+  if ((composition_mode_ == mozc::commands::DIRECT) &&
       !client->IsDirectModeCommand(event)) {
     MOZC_VLOG(1) << "In DIRECT mode. Not consumed.";
     return false;  // not consumed.
@@ -232,11 +228,42 @@ bool MozcState::ProcessKeyEvent(KeySym sym, uint32_t keycode, KeyStates state,
     }
   }
 
+  mozc::commands::KeyEvent event;
+  std::optional<std::string> compose;
+  do {
+    if (!is_key_up &&
+        !state.testAny(KeyStates{KeyState::Ctrl, KeyState::Super})) {
+      compose = engine_->instance()->processComposeString(ic_, sym);
+      if (!compose) {
+        return true;
+      }
+      if (!compose->empty()) {
+        auto length = utf8::lengthValidated(*compose);
+        if (length == utf8::INVALID_LENGTH) {
+          return true;
+        }
+        if (!handler_->GetKeyEvent(*compose, preedit_method_, layout_is_jp,
+                                   &event)) {
+          return false;
+        }
+        break;
+      }
+    }
+    if (!handler_->GetKeyEvent(sym, keycode, state, preedit_method_,
+                               layout_is_jp, is_key_up, &event)) {
+      return false;
+    }
+  } while (false);
+
   std::string error;
   mozc::commands::Output raw_response;
-  if (!TrySendKeyEvent(ic_, sym, keycode, state, composition_mode_,
-                       layout_is_jp, is_key_up, &raw_response, &error)) {
+  if (!TrySendKeyEvent(ic_, event, &raw_response, &error)) {
     // TODO(yusukes): Show |error|.
+    if (compose && !compose->empty()) {
+      ic_->commitString(*compose);
+      Reset();
+      return true;
+    }
     return false;  // not consumed.
   }
 
@@ -274,6 +301,7 @@ void MozcState::Reset() {
   }
   ClearAll();  // just in case.
   DrawAll();
+  engine_->instance()->resetCompose(ic_);
 }
 
 bool MozcState::Paging(bool prev) {
@@ -314,6 +342,7 @@ void MozcState::FocusOut(const InputContextEvent& event) {
   }
   ClearAll();  // just in case.
   DrawAll();
+  engine_->instance()->resetCompose(ic_);
 }
 
 bool MozcState::ParseResponse(const mozc::commands::Output& raw_response) {

src/unix/fcitx5/mozc_state.h

@@ -112,10 +112,7 @@ class MozcState : public InputContextProperty {
   // response is stored on 'out' (and 'out_error' is not modified). If the IPC
   // fails, returns false and the error message is stored on 'out_error'. In
   // this case, 'out' is not modified.
-  bool TrySendKeyEvent(InputContext *ic, KeySym sym, uint32_t keycode,
-                       KeyStates state,
-                       mozc::commands::CompositionMode composition_mode,
-                       bool layout_is_jp, bool is_key_up,
+  bool TrySendKeyEvent(InputContext *ic, const mozc::commands::KeyEvent &event,
                        mozc::commands::Output *out,
                        std::string *out_error) const;