JsonWizard: Make template processing more widely available

Change-Id: I2c6eecc5d2a3c5429ce3a6a564d65f24ae3d23eb
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/projectexplorer/jsonwizard/jsonwizard.cpp

@@ -34,6 +34,7 @@
 
 #include "../project.h"
 #include "../projectexplorer.h"
+#include "../customwizard/customwizardpreprocessor.h"
 
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/messagemanager.h>
@@ -201,6 +202,51 @@ QHash<QString, QVariant> JsonWizard::variables() const
     return result;
 }
 
+QString JsonWizard::processText(Utils::MacroExpander *expander, const QString &input,
+                                QString *errorMessage)
+{
+    errorMessage->clear();
+
+    if (input.isEmpty())
+        return input;
+
+    // Recursively expand macros:
+    QString in = input;
+    QString oldIn;
+    for (int i = 0; i < 5 && in != oldIn; ++i) {
+        oldIn = in;
+        in = expander->expand(oldIn);
+    }
+
+    QString out;
+    if (!Internal::customWizardPreprocess(in, &out, errorMessage))
+        return QString();
+
+    // Expand \n, \t and handle line continuation:
+    QString result;
+    result.reserve(out.count());
+    bool isEscaped = false;
+    for (int i = 0; i < out.count(); ++i) {
+        const QChar c = out.at(i);
+
+        if (isEscaped) {
+            if (c == QLatin1Char('n'))
+                result.append(QLatin1Char('\n'));
+            else if (c == QLatin1Char('t'))
+                result.append(QLatin1Char('\t'));
+            else if (c != QLatin1Char('\n'))
+                result.append(c);
+            isEscaped = false;
+        } else {
+            if (c == QLatin1Char('\\'))
+                isEscaped = true;
+            else
+                result.append(c);
+        }
+    }
+    return result;
+}
+
 void JsonWizard::accept()
 {
     auto page = qobject_cast<Utils::WizardPage *>(currentPage());