implement simple VFS to support caching during project parsing

sync up with qt creator - for qmake itself, this is just a minor
refactoring.

Change-Id: I833253f81c3159056fab2ff888f293b36cc2ef56
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
(cherry picked from qtcreator/66802ef8bf7989dc025e34bf91d93576189c483c)
(cherry picked from qtcreator/69542826fa643a0fed2fc9e717f072c2852dc017)
(cherry picked from qtcreator/196424115338fb9a535810704b7d814d318b0462)
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

1 files changed, 8 insertions, 16 deletions

diff --git a/qmake/library/qmakeparser.cpp b/qmake/library/qmakeparser.cpp
index 49b5429130..35533864eb 100644
--- a/qmake/library/qmakeparser.cpp
+++ b/qmake/library/qmakeparser.cpp
@@ -41,6 +41,7 @@
 
 #include "qmakeparser.h"
 
+#include "qmakevfs.h"
 #include "ioutils.h"
 using namespace QMakeInternal;
 
@@ -142,9 +143,10 @@ void QMakeParser::initialize()
     statics.strLITERAL_WHITESPACE = QLatin1String("LITERAL_WHITESPACE");
 }
 
-QMakeParser::QMakeParser(ProFileCache *cache, QMakeParserHandler *handler)
+QMakeParser::QMakeParser(ProFileCache *cache, QMakeVfs *vfs, QMakeParserHandler *handler)
     : m_cache(cache)
     , m_handler(handler)
+    , m_vfs(vfs)
 {
     // So that single-threaded apps don't have to call initialize() for now.
     initialize();
@@ -230,24 +232,14 @@ void QMakeParser::discardFileFromCache(const QString &fileName)
 
 bool QMakeParser::read(ProFile *pro)
 {
-    QFile file(pro->fileName());
-    if (!file.open(QIODevice::ReadOnly)) {
-        if (m_handler && IoUtils::exists(pro->fileName()))
+    QString content;
+    QString errStr;
+    if (!m_vfs->readFile(pro->fileName(), &content, &errStr)) {
+        if (m_handler && m_vfs->exists(pro->fileName()))
             m_handler->message(QMakeParserHandler::ParserIoError,
-                               fL1S("Cannot read %1: %2").arg(pro->fileName(), file.errorString()));
+                               fL1S("Cannot read %1: %2").arg(pro->fileName(), errStr));
         return false;
     }
-
-    QByteArray bcont = file.readAll();
-    if (bcont.startsWith("\xef\xbb\xbf")) {
-        // UTF-8 BOM will cause subtle errors
-        m_handler->message(QMakeParserHandler::ParserIoError,
-                           fL1S("Unexpected UTF-8 BOM in %1").arg(pro->fileName()));
-        return false;
-    }
-    QString content(QString::fromLocal8Bit(bcont));
-    bcont.clear();
-    file.close();
     return read(pro, content, 1, FullGrammar);
 }