Teuchos: YAML parse support for TwoDArray

This enhancement supports gahansen/Albany#74.
Albany uses TwoDArray type ParameterLists,
and getting these supported in the YAML parser
would streamline our migration from XML to YAML.
There should be no compatibility issue, as I
don't think the current parser can handle nested
Sequences.
A unit test is included.

packages/teuchos/parameterlist/src/Teuchos_YamlParser.cpp

@@ -49,6 +49,7 @@
 
 #include "Teuchos_YamlParser_decl.hpp"
 #include "Teuchos_XMLParameterListCoreHelpers.hpp"
+#include "Teuchos_TwoDArray.hpp"
 
 namespace Teuchos
 {
@@ -63,6 +64,36 @@ template<typename T> Teuchos::Array<T> getYamlArray(const YAML::Node& node)
   return arr;
 }
 
+void checkYamlTwoDArray(const YAML::Node& node, const std::string& key)
+{
+  for (YAML::const_iterator it = node.begin(); it != node.end(); ++it)
+  {
+    if (it->size() != node.begin()->size())
+    {
+      throw YamlSequenceError(std::string("TwoDArray \"") + key + "\" has irregular sizes");
+    }
+  }
+}
+
+template<typename T> Teuchos::TwoDArray<T> getYamlTwoDArray(const YAML::Node& node)
+{
+  Teuchos::TwoDArray<T> arr;
+  typename Teuchos::TwoDArray<T>::size_type i, j;
+  arr.resizeRows(node.size());
+  arr.resizeCols(node.begin()->size());
+  i = 0;
+  for (YAML::const_iterator rit = node.begin(); rit != node.end(); ++rit)
+  {
+    j = 0;
+    for (YAML::const_iterator cit = rit->begin(); cit != rit->end(); ++cit)
+    {
+      arr(i, j) = cit->as<T>();
+      ++j;
+    }
+    ++i;
+  }
+  return arr;
+}
 
 /* Helper functions */
 
@@ -327,29 +358,58 @@ void processKeyValueNode(const std::string& key, const YAML::Node& node, Teuchos
   }
   else if(node.Type() == YAML::NodeType::Sequence)
   {
-    //typeString is used to provide a useful error message if types inconsistent
-    try
-    {
-      node.begin()->as<int>();
-      parent.set(key, getYamlArray<int>(node));
-    }
-    catch(...)
-    {
+    if (node.begin()->Type() == YAML::NodeType::Sequence) {
+      checkYamlTwoDArray(node, key);
+      try
+      {
+        node.begin()->begin()->as<int>();
+        parent.set(key, getYamlTwoDArray<int>(node));
+      }
+      catch(...)
+      {
+        try
+        {
+          node.begin()->begin()->as<double>();
+          parent.set(key, getYamlTwoDArray<double>(node));
+        }
+        catch(...)
+        {
+          try
+          {
+            node.begin()->begin()->as<std::string>();
+            parent.set(key, getYamlTwoDArray<std::string>(node));
+          }
+          catch(...)
+          {
+            throw YamlSequenceError(std::string("TwoDArray \"") + key + "\" must contain int, double, bool or string");
+          }
+        }
+      }
+    } else {
+      //typeString is used to provide a useful error message if types inconsistent
       try
       {
-        node.begin()->as<double>();
-        parent.set(key, getYamlArray<double>(node));
+        node.begin()->as<int>();
+        parent.set(key, getYamlArray<int>(node));
       }
       catch(...)
       {
         try
         {
-          node.begin()->as<std::string>();
-          parent.set(key, getYamlArray<std::string>(node));
+          node.begin()->as<double>();
+          parent.set(key, getYamlArray<double>(node));
         }
         catch(...)
         {
-          throw YamlSequenceError(std::string("Array \"") + key + "\" must contain int, double, bool or string");
+          try
+          {
+            node.begin()->as<std::string>();
+            parent.set(key, getYamlArray<std::string>(node));
+          }
+          catch(...)
+          {
+            throw YamlSequenceError(std::string("Array \"") + key + "\" must contain int, double, bool or string");
+          }
         }
       }
     }

packages/teuchos/parameterlist/test/yaml/TwoDArray.yaml

@@ -0,0 +1,5 @@
+%YAML 1.1
+---
+Albany:
+  str2d: [[R, G, B], ['1', '2', '3']]
+...

packages/teuchos/parameterlist/test/yaml/YamlParameterList.cpp

@@ -53,6 +53,7 @@
 #include <Teuchos_YamlParameterListCoreHelpers.hpp>
 #include <Teuchos_RCP.hpp>
 #include <Teuchos_Exceptions.hpp>
+#include <Teuchos_TwoDArray.hpp>
 
 
 
@@ -129,5 +130,21 @@ namespace TeuchosTests
       }
     });
   }
+  TEUCHOS_UNIT_TEST(YAML, ReadTwoDArray)
+  {
+    std::string correctStrings[2][3] = {{"R", "G", "B"}, {"1", "2", "3"}};
+    TEST_NOTHROW({
+      RCP<ParameterList> plist = Teuchos::getParametersFromYamlFile("TwoDArray.yaml");
+      const Teuchos::TwoDArray<std::string>& str2d = plist->get<Teuchos::TwoDArray<std::string> >("str2d");
+      for (int i = 0; i < 2; ++i) {
+        for (int j = 0; j < 3; ++j) {
+          if (str2d[i][j] != correctStrings[i][j]) {
+            throw std::runtime_error(std::string("str2d[") + std::to_string(i) + "]["
+                + std::to_string(j) + "] is incorrect.");
+          }
+        }
+      }
+    });
+  }
 
 } //namespace TeuchosTests