text: //
  // Copyright 2017 Animal Logic
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.//
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  //
  #include "AL/usdmaya/TransformOperation.h"
  namespace AL {
  namespace usdmaya {
  
  //----------------------------------------------------------------------------------------------------------------------
  // usd transform components (e.g. rotate, scale, etc) are all stringly typed. There is no 'simple' way of determining
  // how these transforms should be interpreted (e.g. should we use a maya transform, a joint, etc). The original maya
  // USD bridge performs an O(n^2) comparison between two string arrays. If all the strings in one array, are found in
  // the second array, then the transform is interpreted as a maya type. String compares seems to be the only way to
  // do this, so this code attempts to improve on the original bridge by being a little bit more cautious in how those
  // strcmps are performed.
  //----------------------------------------------------------------------------------------------------------------------
  
  //----------------------------------------------------------------------------------------------------------------------
  static const std::string g_opNames[] =
  {
    std::string("translate"),
    std::string("pivot"),
    std::string("rotatePivotTranslate"),
    std::string("rotatePivot"),
    std::string("rotate"),
    std::string("rotateAxis"),
    std::string("rotatePivotINV"),
    std::string("scalePivotTranslate"),
    std::string("scalePivot"),
    std::string("shear"),
    std::string("scale"),
    std::string("scalePivotINV"),
    std::string("pivotINV"),
    std::string("transform"),
    std::string("unknown")
  };
  
  //----------------------------------------------------------------------------------------------------------------------
  TransformOperation xformOpToEnum(const std::string& opName)
  {
  #define TestType(X) ((opName == g_opNames[X]) ? X : kUnknownOp)
    switch(opName[0])
    {
      case 'p':
      {
        switch(opName.size())
        {
          case 5: return TestType(kPivot);
          case 8: return TestType(kPivotInv);
        }
      }
      break;
  
      case 'r':
      {
        switch(opName.size())
        {
          case 6: return TestType(kRotate);
          case 7:
          case 9:
          {
            if(opName.compare(0, 6, "rotate") == 0)
            {
              return kRotate;
            }
          }
          case 10: return TestType(kRotateAxis);
          case 11: return TestType(kRotatePivot);
          case 14: return TestType(kRotatePivotInv);
          case 20: return TestType(kRotatePivotTranslate);
        }
      }
      break;
  
      case 's':
      {
        switch(opName.size())
        {
          case 5:
          {
            if(opName[1] == 'c') return TestType(kScale);
            return TestType(kShear);
          }
          case 10: return TestType(kScalePivot);
          case 13: return TestType(kScalePivotInv);
          case 19: return TestType(kScalePivotTranslate);
        }
      }
      break;
  
      case 't':
      {
        if(opName == g_opNames[kTransform]) return kTransform;
        return TestType(kTranslate);
      }
    }
  #undef TestType
    return kUnknownOp;
  }
  
  //----------------------------------------------------------------------------------------------------------------------
  bool matchesMayaProfile(
      std::vector<UsdGeomXformOp>::const_iterator it,
      std::vector<UsdGeomXformOp>::const_iterator end,
      std::vector<TransformOperation>::iterator output)
  {
    bool matchesMaya = true;
  
    int32_t last = -1;
    for(; it != end; ++it, ++output)
    {
      std::string attrName = it->GetBaseName();
      if(it->IsInverseOp())
      attrName += "INV";
      const TransformOperation thisOp = xformOpToEnum(attrName);
      if(thisOp == kPivot || thisOp == kPivotInv || thisOp == kTransform)
      matchesMaya = false;
      if(last >= thisOp)
      matchesMaya = false;
      *output = thisOp;
    }
    return matchesMaya;
  }
  
  //----------------------------------------------------------------------------------------------------------------------
  } // usdmaya
  } // AL
  //----------------------------------------------------------------------------------------------------------------------
  