Autogen: Iterate over makefile sources only once

In QtAutoGen we used to iterate over all makefile source two times to
extract file parameters for moc and uic respectively.  This patch merges both
iterations into one loop. This makes the code easier to understand and likely
faster to execute as well.

Source/cmQtAutoGenInitializer.cxx

@@ -616,40 +616,6 @@ bool cmQtAutoGenInitializer::InitUic()
       }
     }
   }
-  // .ui files skip and options
-  {
-    std::string const uiExt = "ui";
-    std::string pathError;
-    for (cmSourceFile* sf : makefile->GetSourceFiles()) {
-      // sf->GetExtension() is only valid after sf->GetFullPath() ...
-      // Since we're iterating over source files that might be not in the
-      // target we need to check for path errors (not existing files).
-      std::string const& fPath = sf->GetFullPath(&pathError);
-      if (!pathError.empty()) {
-        pathError.clear();
-        continue;
-      }
-      if (sf->GetExtension() == uiExt) {
-        std::string const absFile = cmSystemTools::GetRealPath(fPath);
-        // Check if the .ui file should be skipped
-        if (sf->GetPropertyAsBool("SKIP_AUTOUIC") ||
-            sf->GetPropertyAsBool("SKIP_AUTOGEN")) {
-          this->Uic.Skip.insert(absFile);
-        }
-        // Check if the .ui file has uic options
-        std::string const uicOpts = sf->GetSafeProperty("AUTOUIC_OPTIONS");
-        if (!uicOpts.empty()) {
-          // Check if file isn't skipped
-          if (this->Uic.Skip.count(absFile) == 0) {
-            this->Uic.FileFiles.push_back(absFile);
-            std::vector<std::string> optsVec;
-            cmSystemTools::ExpandListArgument(uicOpts, optsVec);
-            this->Uic.FileOptions.push_back(std::move(optsVec));
-          }
-        }
-      }
-    }
-  }
 
   // Uic executable
   return GetUicExecutable();
@@ -664,18 +630,30 @@ bool cmQtAutoGenInitializer::InitScanFiles()
 {
   cmMakefile* makefile = this->Target->Target->GetMakefile();
 
+  // String constants
+  std::string const SKIP_AUTOGEN_str = "SKIP_AUTOGEN";
+  std::string const SKIP_AUTOMOC_str = "SKIP_AUTOMOC";
+  std::string const SKIP_AUTOUIC_str = "SKIP_AUTOUIC";
+
   // Scan through target files
   {
-    std::string const qrcExt = "qrc";
+    // String constants
+    std::string const qrc_str = "qrc";
+    std::string const SKIP_AUTORCC_str = "SKIP_AUTORCC";
+    std::string const AUTORCC_OPTIONS_str = "AUTORCC_OPTIONS";
+
+    // Scan through target files
     std::vector<cmSourceFile*> srcFiles;
     this->Target->GetConfigCommonSourceFiles(srcFiles);
     for (cmSourceFile* sf : srcFiles) {
-      if (sf->GetPropertyAsBool("SKIP_AUTOGEN")) {
+      if (sf->GetPropertyAsBool(SKIP_AUTOGEN_str)) {
         continue;
       }
+
       // sf->GetExtension() is only valid after sf->GetFullPath() ...
       std::string const& fPath = sf->GetFullPath();
       std::string const& ext = sf->GetExtension();
+
       // Register generated files that will be scanned by moc or uic
       if (this->Moc.Enabled || this->Uic.Enabled) {
         cmSystemTools::FileFormat const fileType =
@@ -683,8 +661,10 @@ bool cmQtAutoGenInitializer::InitScanFiles()
         if ((fileType == cmSystemTools::CXX_FILE_FORMAT) ||
             (fileType == cmSystemTools::HEADER_FILE_FORMAT)) {
           std::string const absPath = cmSystemTools::GetRealPath(fPath);
-          if ((this->Moc.Enabled && !sf->GetPropertyAsBool("SKIP_AUTOMOC")) ||
-              (this->Uic.Enabled && !sf->GetPropertyAsBool("SKIP_AUTOUIC"))) {
+          if ((this->Moc.Enabled &&
+               !sf->GetPropertyAsBool(SKIP_AUTOMOC_str)) ||
+              (this->Uic.Enabled &&
+               !sf->GetPropertyAsBool(SKIP_AUTOUIC_str))) {
             // Register source
             const bool generated = sf->GetIsGenerated();
             if (fileType == cmSystemTools::HEADER_FILE_FORMAT) {
@@ -704,10 +684,9 @@ bool cmQtAutoGenInitializer::InitScanFiles()
         }
       }
       // Register rcc enabled files
-      if (this->Rcc.Enabled && (ext == qrcExt) &&
-          !sf->GetPropertyAsBool("SKIP_AUTORCC")) {
-        // Register qrc file
-        {
+      if (this->Rcc.Enabled) {
+        if ((ext == qrc_str) && !sf->GetPropertyAsBool(SKIP_AUTORCC_str)) {
+          // Register qrc file
           Qrc qrc;
           qrc.QrcFile = cmSystemTools::GetRealPath(fPath);
           qrc.QrcName =
@@ -715,7 +694,7 @@ bool cmQtAutoGenInitializer::InitScanFiles()
           qrc.Generated = sf->GetIsGenerated();
           // RCC options
           {
-            std::string const opts = sf->GetSafeProperty("AUTORCC_OPTIONS");
+            std::string const opts = sf->GetSafeProperty(AUTORCC_OPTIONS_str);
             if (!opts.empty()) {
               cmSystemTools::ExpandListArgument(opts, qrc.Options);
             }
@@ -731,43 +710,65 @@ bool cmQtAutoGenInitializer::InitScanFiles()
   // mocs_compilation.cpp source acknowledged by this target.
   this->Target->ClearSourcesCache();
 
+  // Scan through all source files in the makefile to extract moc and uic
+  // parameters.  Historically we support non target source file parameters.
+  // The reason is that their file names might be discovered from source files
+  // at generation time.
   if (this->Moc.Enabled || this->Uic.Enabled) {
-    // Read skip files from makefile sources
-    {
+    // String constants
+    std::string const ui_str = "ui";
+    std::string const AUTOUIC_OPTIONS_str = "AUTOUIC_OPTIONS";
+
+    for (cmSourceFile* sf : makefile->GetSourceFiles()) {
+      // sf->GetExtension() is only valid after sf->GetFullPath() ...
+      // Since we're iterating over source files that might be not in the
+      // target we need to check for path errors (not existing files).
       std::string pathError;
-      for (cmSourceFile* sf : makefile->GetSourceFiles()) {
-        // sf->GetExtension() is only valid after sf->GetFullPath() ...
-        // Since we're iterating over source files that might be not in the
-        // target we need to check for path errors (not existing files).
-        std::string const& fPath = sf->GetFullPath(&pathError);
-        if (!pathError.empty()) {
-          pathError.clear();
-          continue;
+      std::string const& fullPath = sf->GetFullPath(&pathError);
+      if (!pathError.empty() || fullPath.empty()) {
+        continue;
+      }
+
+      // Check file type
+      auto const fileType = cmSystemTools::GetFileFormat(sf->GetExtension());
+      bool const isSource = (fileType == cmSystemTools::CXX_FILE_FORMAT) ||
+        (fileType == cmSystemTools::HEADER_FILE_FORMAT);
+      bool const isUi = (this->Moc.Enabled && sf->GetExtension() == ui_str);
+
+      // Process only certain file types
+      if (isSource || isUi) {
+        std::string const absFile = cmSystemTools::GetRealPath(fullPath);
+        // Acquire file properties
+        bool const skipAUTOGEN = sf->GetPropertyAsBool(SKIP_AUTOGEN_str);
+        bool const skipMoc = (this->Moc.Enabled && isSource) &&
+          (skipAUTOGEN || sf->GetPropertyAsBool(SKIP_AUTOMOC_str));
+        bool const skipUic = this->Uic.Enabled &&
+          (skipAUTOGEN || sf->GetPropertyAsBool(SKIP_AUTOUIC_str));
+
+        // Register moc and uic skipped file
+        if (skipMoc) {
+          this->Moc.Skip.insert(absFile);
         }
-        cmSystemTools::FileFormat const fileType =
-          cmSystemTools::GetFileFormat(sf->GetExtension());
-        if (!(fileType == cmSystemTools::CXX_FILE_FORMAT) &&
-            !(fileType == cmSystemTools::HEADER_FILE_FORMAT)) {
-          continue;
+        if (skipUic) {
+          this->Uic.Skip.insert(absFile);
         }
-        const bool skipAll = sf->GetPropertyAsBool("SKIP_AUTOGEN");
-        const bool mocSkip = this->Moc.Enabled &&
-          (skipAll || sf->GetPropertyAsBool("SKIP_AUTOMOC"));
-        const bool uicSkip = this->Uic.Enabled &&
-          (skipAll || sf->GetPropertyAsBool("SKIP_AUTOUIC"));
-        if (mocSkip || uicSkip) {
-          std::string const absFile = cmSystemTools::GetRealPath(fPath);
-          if (mocSkip) {
-            this->Moc.Skip.insert(absFile);
-          }
-          if (uicSkip) {
-            this->Uic.Skip.insert(absFile);
+
+        // Check if the .ui file has uic options
+        if (isUi && !skipUic) {
+          std::string const uicOpts = sf->GetSafeProperty(AUTOUIC_OPTIONS_str);
+          if (!uicOpts.empty()) {
+            this->Uic.FileFiles.push_back(absFile);
+            std::vector<std::string> optsVec;
+            cmSystemTools::ExpandListArgument(uicOpts, optsVec);
+            this->Uic.FileOptions.push_back(std::move(optsVec));
           }
         }
       }
     }
+  }
 
-    // Process GENERATED sources and headers
+  // Process GENERATED sources and headers
+  if (this->Moc.Enabled || this->Uic.Enabled) {
     if (!this->AutogenTarget.SourcesGenerated.empty() ||
         !this->AutogenTarget.HeadersGenerated.empty()) {
       // Check status of policy CMP0071
@@ -843,13 +844,14 @@ bool cmQtAutoGenInitializer::InitScanFiles()
         }
       }
     }
-    // Sort headers and sources
-    if (this->Moc.Enabled || this->Uic.Enabled) {
-      std::sort(this->AutogenTarget.Headers.begin(),
-                this->AutogenTarget.Headers.end());
-      std::sort(this->AutogenTarget.Sources.begin(),
-                this->AutogenTarget.Sources.end());
-    }
+  }
+
+  // Sort headers and sources
+  if (this->Moc.Enabled || this->Uic.Enabled) {
+    std::sort(this->AutogenTarget.Headers.begin(),
+              this->AutogenTarget.Headers.end());
+    std::sort(this->AutogenTarget.Sources.begin(),
+              this->AutogenTarget.Sources.end());
   }
 
   // Process qrc files