From 7fbbac4a6556ef7c76e00e40edbef263319962ad Mon Sep 17 00:00:00 2001
From: Brad Arant <barant@barant.com>
Date: Wed, 13 Nov 2024 14:51:34 -0800
Subject: [PATCH] Laid foundation for modifiers and built a couple.

---
 Global.cpp              | 23 ++++++++++-
 Modifiers.cpp           | 85 +++++++++++++++++++++++++++++++++++++++++
 Modifiers.h             | 29 ++++++++++++++
 tests/testmodifiers.jet | 10 +++++
 4 files changed, 146 insertions(+), 1 deletion(-)
 create mode 100644 Modifiers.cpp
 create mode 100644 Modifiers.h
 create mode 100755 tests/testmodifiers.jet

diff --git a/Global.cpp b/Global.cpp
index c580ae2..05fbc56 100644
--- a/Global.cpp
+++ b/Global.cpp
@@ -1,6 +1,7 @@
 #include "Global.h"
 #include "Exception.h"
 #include "__mysql.h"
+#include "Modifiers.h"
 #include <iostream>
 #include <stdlib.h>
 
@@ -38,9 +39,29 @@ namespace jet {
    }
 
    coreutils::MString& Global::processModifier(coreutils::MString &value, coreutils::MString &modifier) {
+      Modifiers modifiers;
       if(modifier.getLength() == 0)
 	return value;
-      lastConverted = modifier;
+      if(modifier == "tobinary")
+	modifiers.processToBinaryModifier(value, lastConverted);
+      if(modifier == "frombinary")
+	modifiers.processFromBinaryModifier(value, lastConverted);
+      if(modifier == "tohex")
+	modifiers.processToHexModifier(value, lastConverted);
+      if(modifier == "fromhex")
+	modifiers.processFromHexModifier(value, lastConverted);
+      if(modifier == "tobase64")
+	modifiers.processToBase64Modifier(value, lastConverted);
+      if(modifier == "frombase64")
+	modifiers.processFromBase64Modifier(value, lastConverted);
+      if(modifier == "toupper")
+	modifiers.processToUpperModifier(value, lastConverted);
+      if(modifier == "tolower")
+	modifiers.processToLowerModifier(value, lastConverted);
+      if(modifier == "tocgi")
+	modifiers.processToCGIModifier(value, lastConverted);
+      if(modifier == "fromcgi")
+	modifiers.processFromCGIModifier(value, lastConverted);
       return lastConverted;
    }
    
diff --git a/Modifiers.cpp b/Modifiers.cpp
new file mode 100644
index 0000000..6279213
--- /dev/null
+++ b/Modifiers.cpp
@@ -0,0 +1,85 @@
+#include "Modifiers.h"
+#include "Exception.h"
+
+namespace jet {
+   
+   void Modifiers::processToBinaryModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+      value.reset();
+      lastConverted = "";
+      char temp;
+      while(!value.eod()) {
+	 temp = value.nextChar();
+	 if(strchr("\\'\".\0\r\n", temp))
+	   lastConverted.write('\\');
+	 lastConverted.write(temp);	  
+      }
+      value.reset();
+   }
+   	
+   void Modifiers::processFromBinaryModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+   }
+      
+   void Modifiers::processToHexModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+      value.reset();
+      lastConverted = "";
+      char temp;
+      while(!value.eod()) {
+	 temp = value.nextChar();
+	 char temp2 = temp;
+	 temp >>= 4;
+	 lastConverted.write(hexChar(temp));
+	 lastConverted.write(hexChar(temp2));
+      }      
+      value.reset();
+   }   	
+
+   void Modifiers::processFromHexModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+      value.reset();
+      lastConverted = "";
+      while(!value.eod()) {
+	 char ch1 = value.nextChar();
+	 ch1 -= 48;
+	 if(ch1 > 9)
+	   ch1 -= 7;
+	 ch1 <<= 4;
+	 ch1 &= 240;
+	 if(value.eod())
+	   coreutils::Exception("conversion from hex requires even number of characters.");
+	 char ch2 = value.nextChar();
+	 ch2 -= 48;
+	 if(ch2 > 9)
+	   ch2 -= 7;
+	 ch2 &= 15;
+	 ch1 |= ch2;
+	 lastConverted.write(ch1);	 
+      }
+      value.reset();
+   }
+   	
+   void Modifiers::processToBase64Modifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+   }
+   	
+   void Modifiers::processFromBase64Modifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+   }
+   	
+   void Modifiers::processToUpperModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+   }
+   	
+   void Modifiers::processToLowerModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+   }
+   	
+   void Modifiers::processToCGIModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+   }
+   	
+   void Modifiers::processFromCGIModifier(coreutils::MString &value, coreutils::MString &lastConverted) {
+   }
+
+   char Modifiers::hexChar(char c) {
+      c &= 15;
+      c += 48;
+      if(c > 57)
+	c += 7;
+      return c;
+   }
+   
+}
diff --git a/Modifiers.h b/Modifiers.h
new file mode 100644
index 0000000..3c8383f
--- /dev/null
+++ b/Modifiers.h
@@ -0,0 +1,29 @@
+#ifndef __MODIFIERS_H__
+#define __MODIFIERS_H__
+
+#include "MString.h"
+
+namespace jet {
+
+   class Modifiers {
+
+    public: 
+      void processToBinaryModifier(coreutils::MString &value, coreutils::MString &lastConverted);
+      void processFromBinaryModifier(coreutils::MString &value, coreutils::MString &lastConverted);
+      void processToHexModifier(coreutils::MString &value, coreutils::MString &lastConverted);
+      void processFromHexModifier(coreutils::MString &value, coreutils::MString &lastConverted);
+      void processToBase64Modifier(coreutils::MString &value, coreutils::MString &lastConverted);
+      void processFromBase64Modifier(coreutils::MString &value, coreutils::MString &lastConverted);
+      void processToUpperModifier(coreutils::MString &value, coreutils::MString &lastConverted);
+      void processToLowerModifier(coreutils::MString &value, coreutils::MString &lastConverted);
+      void processToCGIModifier(coreutils::MString &value, coreutils::MString &lastConverted);
+      void processFromCGIModifier(coreutils::MString &value, coreutils::MString &lastConverted);
+
+    private:
+      char hexChar(char c);
+      
+   };
+   
+}
+
+#endif
diff --git a/tests/testmodifiers.jet b/tests/testmodifiers.jet
new file mode 100755
index 0000000..07bc6e4
--- /dev/null
+++ b/tests/testmodifiers.jet
@@ -0,0 +1,10 @@
+#!../jet-2.0
+<jet>
+ <set name="tester1" value="this is a test of the hex conversion." />
+ <set name="tester2" value="$[tester1;tohex]" />
+1) $[tester1;tobinary]
+2) $[tester1;tohex]
+3) $[tester2;fromhex]
+4) $[tester1]
+5) $[tester2]
+</jet>
\ No newline at end of file