From e6e1434fc1bc3f5108c3a654b70d2b73fe55fb17 Mon Sep 17 00:00:00 2001
From: Michael Davidsaver <mdavidsaver@bnl.gov>
Date: Fri, 26 Apr 2013 15:54:39 -0400
Subject: [PATCH] Add PrinterPlain

---
 pvDataApp/Makefile            |   2 +
 pvDataApp/factory/printer.cpp | 138 ++++++++++++++++++++++++++++++++++
 pvDataApp/pv/printer.h        |  60 +++++++++++++++
 3 files changed, 200 insertions(+)
 create mode 100644 pvDataApp/factory/printer.cpp
 create mode 100644 pvDataApp/pv/printer.h

diff --git a/pvDataApp/Makefile b/pvDataApp/Makefile
index 88e54e7..bd628a4 100644
--- a/pvDataApp/Makefile
+++ b/pvDataApp/Makefile
@@ -25,6 +25,7 @@ INC += status.h
 INC += sharedPtr.h
 INC += localStaticLock.h
 INC += typeCast.h
+INC += printer.h
 
 LIBSRCS += byteBuffer.cpp
 LIBSRCS += bitSet.cpp
@@ -67,6 +68,7 @@ LIBSRCS += Convert.cpp
 LIBSRCS += Compare.cpp
 LIBSRCS += StandardField.cpp
 LIBSRCS += StandardPVField.cpp
+LIBSRCS += printer.cpp
 
 SRC_DIRS += $(PVDATA)/property
 
diff --git a/pvDataApp/factory/printer.cpp b/pvDataApp/factory/printer.cpp
new file mode 100644
index 0000000..1b39ecc
--- /dev/null
+++ b/pvDataApp/factory/printer.cpp
@@ -0,0 +1,138 @@
+
+#include "pv/printer.h"
+
+namespace {
+
+void indentN(std::ostream& strm, size_t N)
+{
+    while(N--)
+        strm.put(' ');
+}
+
+}
+
+namespace epics { namespace pvData {
+
+PrinterBase::PrinterBase()
+    :strm(NULL)
+{}
+
+PrinterBase::~PrinterBase() {}
+
+void PrinterBase::setStream(std::ostream& s)
+{
+    strm = &s;
+}
+
+void PrinterBase::clearStream()
+{
+    strm = NULL;
+}
+
+void PrinterBase::print(const PVField& pv)
+{
+    if(!strm)
+        throw std::runtime_error("No stream set for PV Printer");
+    impl_print(pv);
+}
+
+void PrinterBase::beginStructure(const PVStructure&) {}
+void PrinterBase::endStructure(const PVStructure&) {}
+
+void PrinterBase::beginStructureArray(const PVStructureArray&) {}
+void PrinterBase::endStructureArray(const PVStructureArray&) {}
+
+void PrinterBase::encodeScalar(const PVScalar& pv) {}
+
+void PrinterBase::encodeArray(const PVScalarArray&) {}
+
+void PrinterBase::abortField(const PVField&) {}
+
+void PrinterBase::impl_print(const PVField& pv)
+{
+    try {
+        switch(pv.getField()->getType()) {
+        case scalar: encodeScalar(static_cast<const PVScalar&>(pv)); return;
+        case scalarArray: encodeArray(static_cast<const PVScalarArray&>(pv)); return;
+        case structure: {
+                const PVStructure &fld = static_cast<const PVStructure&>(pv);
+                const PVFieldPtrArray& vals = fld.getPVFields();
+
+                beginStructure(fld);
+                for(size_t i=0, nfld=fld.getNumberFields(); i<nfld; i++)
+                    this->print(*vals[i]);
+                endStructure(fld);
+            }
+        case structureArray: {
+                const PVStructureArray &fld = static_cast<const PVStructureArray&>(pv);
+                const PVStructureArray::pointer vals = fld.get();
+
+                beginStructureArray(fld);
+                for(size_t i=0, nfld=fld.getLength(); i<nfld; i++)
+                    this->print(*vals[i]);
+                endStructureArray(fld);
+            }
+        }
+    } catch(...) {
+        abortField(pv);
+        throw;
+    }
+}
+
+
+PrinterPlain::PrinterPlain()
+    :PrinterBase()
+    ,ilvl(0)
+{}
+
+PrinterPlain::~PrinterPlain() {}
+
+void PrinterPlain::beginStructure(const PVStructure& pv)
+{
+    indentN(S(), ilvl);
+    S() << pv.getStructure()->getID() << " " << pv.getFieldName();
+    String ename(pv.getExtendsStructureName());
+    if(!ename.empty())
+        S() << " extends " << ename;
+    S() << std::endl;
+    ilvl++;
+}
+
+void PrinterPlain::endStructure(const PVStructure&) {ilvl--;}
+
+void PrinterPlain::beginStructureArray(const PVStructureArray& pv)
+{
+    indentN(S(), ilvl);
+    S() << pv.getStructureArray()->getID() << " "
+        << pv.getFieldName() << " ";
+    ilvl++;
+}
+
+void PrinterPlain::endStructureArray(const PVStructureArray&) {ilvl--;}
+
+void PrinterPlain::encodeScalar(const PVScalar& pv)
+{
+    indentN(S(), ilvl);
+    S() << pv.getScalar()->getID() << " "
+        << pv.getFieldName() << " "
+        << pv.getAs<pvString>() << std::endl;
+}
+
+void PrinterPlain::encodeArray(const PVScalarArray& pv)
+{
+    indentN(S(), ilvl);
+    StringArray temp(pv.getLength()); // TODO: no copy
+    pv.getAs<pvString>(&temp[0], temp.size());
+
+    S() << pv.getScalarArray()->getID() << " "
+        << pv.getFieldName() << " [";
+    for(size_t i=0, len=pv.getLength(); i<len; i++) {
+        S() << temp[i];
+        if(i!=len-1)
+            S().put(',');
+    }
+    S() << "]" << std::endl;
+}
+
+
+}}
diff --git a/pvDataApp/pv/printer.h b/pvDataApp/pv/printer.h
new file mode 100644
index 0000000..4693c77
--- /dev/null
+++ b/pvDataApp/pv/printer.h
@@ -0,0 +1,60 @@
+#ifndef PRINTER_H
+#define PRINTER_H
+
+#include <ostream>
+
+#include "pvData.h"
+
+namespace epics { namespace pvData {
+
+class PrinterBase
+{
+public:
+    virtual void setStream(std::ostream&);
+    virtual void clearStream();
+
+    virtual void print(const PVField&);
+
+protected:
+    PrinterBase();
+    virtual ~PrinterBase()=0;
+
+    virtual void beginStructure(const PVStructure&);
+    virtual void endStructure(const PVStructure&);
+
+    virtual void beginStructureArray(const PVStructureArray&);
+    virtual void endStructureArray(const PVStructureArray&);
+
+    virtual void encodeScalar(const PVScalar&);
+    virtual void encodeArray(const PVScalarArray&);
+
+    virtual void abortField(const PVField&);
+
+    inline std::ostream& S() { return *strm; }
+
+    void impl_print(const PVField&);
+private:
+    std::ostream *strm;
+};
+
+class PrinterPlain : public PrinterBase
+{
+    size_t ilvl;
+protected:
+    virtual void beginStructure(const PVStructure&);
+    virtual void endStructure(const PVStructure&);
+
+    virtual void beginStructureArray(const PVStructureArray&);
+    virtual void endStructureArray(const PVStructureArray&);
+
+    virtual void encodeScalar(const PVScalar&);
+    virtual void encodeArray(const PVScalarArray&);
+
+public:
+    PrinterPlain();
+    virtual ~PrinterPlain();
+};
+
+}}
+
+#endif // PRINTER_H