From 110f379c083a9e061d2337efabb86f12ce0fa750 Mon Sep 17 00:00:00 2001
From: Emiel Bruijntjes <emiel.bruijntjes@copernica.com>
Date: Sun, 25 Jan 2015 19:52:06 +0100
Subject: added functions Php::constant() to retrieve the value of a constant,
 and Php::defined() to find out if a constant is defined

---
 include/call.h         |   6 +++
 include/constant.h     |   2 +-
 include/value.h        |   5 +++
 zend/constant.cpp      |   4 +-
 zend/constantfuncs.cpp | 113 +++++++++++++++++++++++++++++++++++++++++++++++++
 zend/value.cpp         |   3 +-
 6 files changed, 127 insertions(+), 6 deletions(-)
 create mode 100644 zend/constantfuncs.cpp

diff --git a/include/call.h b/include/call.h
index 279cbac..950cc3e 100644
--- a/include/call.h
+++ b/include/call.h
@@ -18,6 +18,12 @@ namespace Php {
 extern bool  class_exists(const char *classname, size_t size, bool autoload = true);
 inline bool  class_exists(const char *classname, bool autoload = true) { return class_exists(classname, strlen(classname), autoload); }
 inline bool  class_exists(const std::string &classname, bool autoload = true) { return class_exists(classname.c_str(), classname.size(), autoload); }
+extern Value constant(const char *constant);
+extern Value constant(const char *constant, size_t size);
+extern Value constant(const std::string &constant);
+extern bool  defined(const char *constant);
+extern bool  defined(const char *constant, size_t size);
+extern bool  defined(const std::string &constant);
 extern Value eval(const std::string &phpCode);
 extern Value include(const std::string &filename);
 extern Value include_once(const std::string &filename);
diff --git a/include/constant.h b/include/constant.h
index 36b3417..5e18792 100644
--- a/include/constant.h
+++ b/include/constant.h
@@ -66,7 +66,7 @@ public:
      *  @param  clss        Class to which the constant is added
      *  @internal
      */
-    void addTo(ClassBase &clss);
+    void addTo(ClassBase &clss) const;
 
 private:
     /**
diff --git a/include/value.h b/include/value.h
index a450755..dbd3788 100644
--- a/include/value.h
+++ b/include/value.h
@@ -1157,6 +1157,11 @@ protected:
      */
     struct _zend_class_entry *classEntry(bool allowString = true) const;
     
+    /**
+     *  Functions that need access to the privates
+     */
+    friend Value constant(const char *name, size_t size);
+    
     /**
      *  The Globals and Member classes can access the zval directly
      */
diff --git a/zend/constant.cpp b/zend/constant.cpp
index 102e4f7..4123bba 100644
--- a/zend/constant.cpp
+++ b/zend/constant.cpp
@@ -96,14 +96,12 @@ Constant::Constant(const char *name, const std::string &value) :
  *  @param  clss        Class to which the constant is added
  *  @internal
  */
-void Constant::addTo(ClassBase &clss)
+void Constant::addTo(ClassBase &clss) const
 {
     // pass on to the implementation
     _impl->addTo(clss);
 }
 
-
-
 /**
  *  End of namespace
  */
diff --git a/zend/constantfuncs.cpp b/zend/constantfuncs.cpp
new file mode 100644
index 0000000..c350f91
--- /dev/null
+++ b/zend/constantfuncs.cpp
@@ -0,0 +1,113 @@
+/**
+ *  ConstantFuncs.cpp
+ *
+ *  C++ implementation of PHP functions to retrieve and set constants.
+ *
+ *  @author Emiel Bruijntjes <emiel.bruijntjes@copernica.com>
+ *  @copyright 2014 Copernica BV
+ */
+
+/**
+ *  Dependencies
+ */
+#include "includes.h"
+
+/**
+ *  Set up namespace
+ */
+namespace Php {
+
+/**
+ *  Retrieve the value of a constant by its name
+ *  @param  name            Name of the constant
+ *  @return Value           Actual constant value
+ */
+Value constant(const char *name)
+{
+    // pass on to other implementation
+    return constant(name, ::strlen(name));
+}
+
+/**
+ *  Retrieve a constant by its name, and the size of the name
+ *  @param  constant        Name of the constant
+ *  @param  size            Size of the name
+ *  @return Value
+ */
+Value constant(const char *constant, size_t size)
+{
+    // we need the tsrm_ls variable
+    TSRMLS_FETCH();
+
+    // the value that holds the result
+    Value result;
+
+    // retrieve the constant
+    if (!zend_get_constant(constant, size, result._val TSRMLS_CC)) return nullptr;
+    
+    // zval was correctly retrieved, wrap in value
+    return result;
+}
+
+/**
+ *  Retrieve the value of a constant by its name
+ *  @param  name            Name of the constant
+ *  @return Value           Actual constant value
+ */
+Value constant(const std::string &name)
+{
+    // pass on to other implementation
+    return constant(name.c_str(), name.size());
+}
+
+/**
+ *  Check whether a constant exists
+ *  @param  name
+ *  @param  size
+ *  @return bool
+ */
+bool defined(const char *name, size_t size) 
+{
+    // we need the tsrm_ls variable
+    TSRMLS_FETCH();
+
+    // result variable
+    zval c;
+
+    // retrieve the constant
+    if (!zend_get_constant_ex(name, size, &c, NULL, ZEND_FETCH_CLASS_SILENT TSRMLS_CC)) return false;
+
+    // constant exists, but the returned zval should first be destructed
+    zval_dtor(&c);
+    
+    // done
+    return true;
+}
+
+/**
+ *  Check whether a constant exists
+ *  @param  name
+ *  @return bool
+ */
+bool defined(const char *name)
+{
+    // pass on
+    return defined(name, ::strlen(name));
+}
+
+/**
+ *  Check whether a constant exists
+ *  @param  name
+ *  @return bool
+ */
+bool defined(const std::string &name)
+{
+    // pass on
+    return defined(name.c_str(), name.size());
+}
+
+/**
+ *  End namespace
+ */
+}
+
diff --git a/zend/value.cpp b/zend/value.cpp
index 4a59d97..8c8cc9a 100644
--- a/zend/value.cpp
+++ b/zend/value.cpp
@@ -156,8 +156,7 @@ Value::Value(double value)
  *  @param  zval        Value to wrap
  *  @param  ref         Force this to be a reference
  */
-Value::Value(struct _zval_struct *val, bool ref)
-: _val(val)
+Value::Value(struct _zval_struct *val, bool ref) : _val(val)
 {
     // if the variable is not already a reference, and it has more than one
     // variable pointing to it, we should seperate it so that any changes
-- 
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