fix #326 - enhancement: Suggest macro names after "#ifdef"/"#ifndef".

NEWS.md

@@ -90,6 +90,7 @@ Red Panda C++ Version 2.27
   - enhancement: Shortcut key for buttons in find/replace and "find in files" dialogs.  
   
   - enhancement: Auto define macro "_DEBUG" for "Debug" compiler set(like visual studio).
+  - enhancement: Suggest macro names after "#ifdef"/"#ifndef".
     
 Red Panda C++ Version 2.26
   - enhancement: Code suggestion for embedded std::vectors.

RedPandaIDE/editor.cpp

@@ -926,6 +926,11 @@ void Editor::keyPressEvent(QKeyEvent *event)
 
                             //last word is a type keyword, this is a var or param define, and dont show suggestion
                             return;
+                        } else if (lastWord == "#ifdef" || lastWord == "#ifndef") {
+                            processCommand(QSynedit::EditCommand::Char,ch,nullptr);
+                            showCompletion(lastWord,false, CodeCompletionType::Macros);
+                            handled=true;
+                            return;
                         }
                         PStatement statement = mParser->findStatementOf(
                                     mFilename,
@@ -4991,6 +4996,7 @@ QString Editor::getPreviousWordAtPositionForSuggestion(const QSynedit::BufferCoo
         while ((wordBegin >= 0) && (isIdentChar(s[wordBegin]) || s[wordBegin]==':') ) {
             wordBegin--;
         }
+        if (wordBegin<0 || s[wordBegin]!='#')
             wordBegin++;
 
         if (s[wordBegin]>='0' && s[wordBegin]<='9') // not valid word

RedPandaIDE/widgets/codecompletionpopup.cpp

@@ -113,6 +113,10 @@ void CodeCompletionPopup::prepareSearch(
         mIncludedFiles.clear();
         getKeywordCompletionFor(customKeywords);
         break;
+    case CodeCompletionType::Macros:
+        mIncludedFiles = mParser->getIncludedFiles(filename);
+        getMacroCompletionList(filename, line);
+        break;
     default:
         mIncludedFiles = mParser->getIncludedFiles(filename);
         getCompletionFor(ownerExpression,memberOperator,memberExpression, filename,line, customKeywords);
@@ -583,6 +587,15 @@ void CodeCompletionPopup::getKeywordCompletionFor(const QSet<QString> &customKey
     }
 }
 
+void CodeCompletionPopup::getMacroCompletionList(const QString &fileName, int line)
+{
+    const StatementMap& statementMap = mParser->statementList().childrenStatements(nullptr);
+    foreach(const PStatement& statement, statementMap.values()) {
+        if (statement->kind==StatementKind::skPreprocessor)
+            addStatement(statement,fileName,line);
+    }
+}
+
 void CodeCompletionPopup::getCompletionFor(
         QStringList ownerExpression,
         const QString& memberOperator,

RedPandaIDE/widgets/codecompletionpopup.h

@@ -43,6 +43,7 @@ enum class CodeCompletionType {
     FunctionWithoutDefinition,
     Namespaces,
     Types,
+    Macros,
     KeywordsOnly
 };
 
@@ -136,6 +137,7 @@ private:
     void addStatement(const PStatement& statement, const QString& fileName, int line);
     void filterList(const QString& member);
     void getKeywordCompletionFor(const QSet<QString>& customKeywords);
+    void getMacroCompletionList(const QString &fileName, int line);
     void getCompletionFor(
             QStringList ownerExpression,
             const QString& memberOperator,