// TnzCore includes

#include "tconvert.h"

// TnzBase includes

#include "tdoubleparam.h"

#include "tparamcontainer.h"

#include "tparamset.h"

#include "texpression.h"

#include "tparser.h"

#include "tfx.h"

#include "tzeraryfx.h"

#include "tcolumnset.h"

#include "tw/stringtable.h"

#include "tunit.h"

// TnzLib includes

#include "toonz/txsheet.h"

#include "toonz/txshcell.h"

#include "toonz/tstageobjectid.h"

#include "toonz/tstageobject.h"

#include "toonz/fxdag.h"

#include "toonz/tstageobjecttree.h"

#include "toonz/tcolumnfxset.h"

#include "toonz/tcolumnfx.h"

// Boost includes

#include "boost/noncopyable.hpp"

// Qt includes

#include <qstring></qstring>

#include "toonz/txsheetexpr.h"

#include <memory></memory>

using namespace TSyntax;

//******************************************************************************

//    Local namespace  stuff

//******************************************************************************

namespace {

//===================================================================

class ParamDependencyFinder final : public TSyntax::CalculatorNodeVisitor {

  TDoubleParam *m_possiblyDependentParam;

  bool m_found;

public:

  ParamDependencyFinder(TDoubleParam *possiblyDependentParam)

      : m_possiblyDependentParam(possiblyDependentParam), m_found(false) {}

  void check(TDoubleParam *param) {

    if (param == m_possiblyDependentParam) m_found = true;

  }

  bool found() const { return m_found; }

};

//===================================================================

/*

class ColumnReferenceFinder final : public TSyntax::CalculatorNodeVisitor {

  QSet<int> m_indices;</int>

public:

  ColumnReferenceFinder() {}

  void registerColumnIndex(int columnIndex) { m_indices.insert(columnIndex); }

  QSet<int> indices() const { return m_indices; }</int>

};

*/

//===================================================================

class ParamReferenceFinder final : public TSyntax::CalculatorNodeVisitor {

  QSet<tdoubleparam *=""> m_refParams;</tdoubleparam>

  QSet<int> m_columnIndices;</int>

public:

  ParamReferenceFinder() {}

  void registerRefParam(TDoubleParam *param) { m_refParams.insert(param); }

  void registerColumnIndex(int columnIndex) {

    m_columnIndices.insert(columnIndex);

  }

  QSet<int> columnIndices() const { return m_columnIndices; }</int>

  QSet<tdoubleparam *=""> refParams() const { return m_refParams; }</tdoubleparam>

};

//===================================================================

//

// Calculator Nodes

//

//-------------------------------------------------------------------

class ParamCalculatorNode : public CalculatorNode,

                            public TParamObserver,

                            public boost::noncopyable {

  std::unique_ptr<calculatornode> m_frame;</calculatornode>

protected:

  TDoubleParamP m_param;

public:

  ParamCalculatorNode(Calculator *calculator, const TDoubleParamP ¶m,

                      std::unique_ptr<calculatornode> frame)</calculatornode>

      : CalculatorNode(calculator), m_param(param), m_frame(std::move(frame)) {

    param->addObserver(this);

  }

  ~ParamCalculatorNode() { m_param->removeObserver(this); }

  double compute(double vars[3]) const override {

    double value      = m_param->getValue(m_frame->compute(vars) - 1);

    TMeasure *measure = m_param->getMeasure();

    if (measure) {

      const TUnit *unit = measure->getCurrentUnit();

      if (unit) value = unit->convertTo(value);

    }

    return value;

  }

  void accept(TSyntax::CalculatorNodeVisitor &visitor) override {

    ParamReferenceFinder *prf = dynamic_cast<paramreferencefinder *="">(&visitor);</paramreferencefinder>

    if (prf) {

      prf->registerRefParam(m_param.getPointer());

      return;

    }

    ParamDependencyFinder *pdf =

        dynamic_cast<paramdependencyfinder *="">(&visitor);</paramdependencyfinder>

    if (pdf) {

      pdf->check(m_param.getPointer());

      if (!pdf->found()) m_param->accept(visitor);

    }

  }

  void onChange(const TParamChange ¶mChange) override {

    // The referenced parameter changed. This means the parameter owning the

    // expression this node is part of, changes too.

    // A param change is thus propagated for this parameter, with the 'keyframe'

    // parameter turned off - since no keyframe value is actually altered.

    if (TDoubleParam *ownerParam = getCalculator()->getOwnerParameter()) {

      const std::set<tparamobserver *=""> &observers = ownerParam->observers();</tparamobserver>

      TParamChange propagatedChange(ownerParam, 0, 0, false,

                                    paramChange.m_dragging,

                                    paramChange.m_undoing);

      std::set<tparamobserver *="">::const_iterator ot, oEnd = observers.end();</tparamobserver>

      for (ot = observers.begin(); ot != oEnd; ++ot)

        (*ot)->onChange(propagatedChange);

    }

  }

  bool hasReference() const override { return true; }

};

// ParamCalculatorNode subclass to monitor referenced columns

class ColumnParamCalculatorNode final : public ParamCalculatorNode {

  int m_columnIndex;

public:

  ColumnParamCalculatorNode(Calculator *calculator, const TDoubleParamP ¶m,

                            std::unique_ptr<calculatornode> frame,</calculatornode>

                            int columnIndex)

      : ParamCalculatorNode(calculator, param, std::move(frame))

      , m_columnIndex(columnIndex) {}

  void accept(TSyntax::CalculatorNodeVisitor &visitor) override {

    ParamReferenceFinder *prf = dynamic_cast<paramreferencefinder *="">(&visitor);</paramreferencefinder>

    if (prf) {

      prf->registerRefParam(m_param.getPointer());

      prf->registerColumnIndex(m_columnIndex);

      return;

    }

    ParamDependencyFinder *pdf =

        dynamic_cast<paramdependencyfinder *="">(&visitor);</paramdependencyfinder>

    if (pdf) {

      pdf->check(m_param.getPointer());

      if (!pdf->found()) m_param->accept(visitor);

    }

  }

};

//-------------------------------------------------------------------

class XsheetDrawingCalculatorNode final : public CalculatorNode,

                                          public boost::noncopyable {

  TXsheet *m_xsh;

  int m_columnIndex;

  std::unique_ptr<calculatornode> m_frame;</calculatornode>

public:

  XsheetDrawingCalculatorNode(Calculator *calc, TXsheet *xsh, int columnIndex,

                              std::unique_ptr<calculatornode> frame)</calculatornode>

      : CalculatorNode(calc)

      , m_xsh(xsh)

      , m_columnIndex(columnIndex)

      , m_frame(std::move(frame)) {}

  double compute(double vars[3]) const override {

    double f = m_frame->compute(vars);

    int i    = tfloor(f);

    f        = f - (double)i;

    TXshCell cell;

    cell     = m_xsh->getCell(i, m_columnIndex);

    int d0   = cell.isEmpty() ? 0 : cell.m_frameId.getNumber();

    cell     = m_xsh->getCell(i + 1, m_columnIndex);

    int d1   = cell.isEmpty() ? 0 : cell.m_frameId.getNumber();

    double d = (1 - f) * d0 + f * d1;

    return d;

  }

  void accept(TSyntax::CalculatorNodeVisitor &visitor) override {

    ParamReferenceFinder *prf = dynamic_cast<paramreferencefinder *="">(&visitor);</paramreferencefinder>

    if (prf) prf->registerColumnIndex(m_columnIndex);

  }

  bool hasReference() const override { return true; }

};

//===================================================================

//

// Patterns

//

//-------------------------------------------------------------------

class XsheetReferencePattern final : public Pattern {

  TXsheet *m_xsh;

public:

  XsheetReferencePattern(TXsheet *xsh) : m_xsh(xsh) {

    setDescription(std::string("object.action\nTransformation reference\n") +

                   "object can be: tab, table, cam<n>, camera<n>, col<n>, "</n></n></n>

                   "peg<n>, pegbar<n>\n" +</n></n>

                   "action can be: "

                   "ns,ew,rot,ang,angle,z,zdepth,sx,sy,sc,scale,scalex,scaley,"

                   "path,pos,shx,shy");

  }

  TStageObjectId matchObjectName(const Token &token) const {

    std::string s = toLower(token.getText());

    int len       = (int)s.length(), i, j;

    for (i = 0; i < len && isascii(s[i]) && isalpha(s[i]); i++) {

    }

    if (i == 0) return TStageObjectId::NoneId;

    std::string a = s.substr(0, i);

    int index     = 0;

    for (j = i; j < len && isascii(s[j]) && isdigit(s[j]); j++)

      index = index * 10 + (s[j] - '0');

    if (j < len) return TStageObjectId::NoneId;

    if (i == j) index = -1;

    if ((a == "table" || a == "tab") && index < 0)

      return TStageObjectId::TableId;

    else if (a == "col" && index >= 1)

      return TStageObjectId::ColumnId(index - 1);

    else if ((a == "cam" || a == "camera") && index >= 1)

      return TStageObjectId::CameraId(index - 1);

    else if ((a == "peg" || a == "pegbar") && index >= 1)

      return TStageObjectId::PegbarId(index - 1);

    else

      return TStageObjectId::NoneId;

  }

  TStageObjectId matchExistingObjectName(const Token &token) const {

    TStageObjectId objId = matchObjectName(token);

    if (objId != TStageObjectId::NoneId &&

        m_xsh->getStageObjectTree()->getStageObject(objId, false))

      return objId;

    else

      return TStageObjectId::NoneId;

  }

  TStageObject::Channel matchChannelName(const Token &token) const {

    std::string s = toLower(token.getText());

    if (s == "y" || s == "ns")

      return TStageObject::T_Y;

    else if (s == "x" || s == "ew")

      return TStageObject::T_X;

    else if (s == "rot" || s == "ang" || s == "angle")

      return TStageObject::T_Angle;

    else if (s == "z" || s == "zdepth")

      return TStageObject::T_Z;

    else if (s == "sx" || s == "scalex" || s == "xscale" || s == "xs" ||

             s == "sh" || s == "scaleh" || s == "hscale" || s == "hs")

      return TStageObject::T_ScaleX;

    else if (s == "sy" || s == "scaley" || s == "yscale" || s == "ys" ||

             s == "sv" || s == "scalev" || s == "vscale" || s == "vs")

      return TStageObject::T_ScaleY;

    else if (s == "sc" || s == "scale")

      return TStageObject::T_Scale;

    else if (s == "path" || s == "pos")

      return TStageObject::T_Path;

    else if (s == "shearx" || s == "shx" || s == "shearh" || s == "shh")

      return TStageObject::T_ShearX;

    else if (s == "sheary" || s == "shy" || s == "shearv" || s == "shv")

      return TStageObject::T_ShearY;

    else

      return TStageObject::T_ChannelCount;

  }

  bool expressionExpected(

      const std::vector<token> &previousTokens) const override {</token>

    return previousTokens.size() == 4;

  }

  bool matchToken(const std::vector<token> &previousTokens,</token>

                  const Token &token) const override {

    int i = (int)previousTokens.size();

    if (i == 0)

      return matchExistingObjectName(token) != TStageObjectId::NoneId;

    else if ((i == 1 && token.getText() == ".") ||

             (i == 3 && token.getText() == "(") ||

             (i == 5 && token.getText() == ")"))

      return true;

    else if (i == 2) {

      if (matchChannelName(token) < TStageObject::T_ChannelCount)

        return true;

      else

        return token.getText() == "cell" &&

               matchExistingObjectName(previousTokens[0]).isColumn();

    } else

      return false;

  }

  bool isFinished(const std::vector<token> &previousTokens,</token>

                  const Token &token) const override {

    return previousTokens.size() >= 6;

  }

  bool isComplete(const std::vector<token> &previousTokens,</token>

                  const Token &token) const override {

    return previousTokens.size() >= 6 || previousTokens.size() == 3;

  }

  TSyntax::TokenType getTokenType(const std::vector<token> &previousTokens,</token>

                                  const Token &token) const override {

    return TSyntax::Operator;

  }

  void getAcceptableKeywords(

      std::vector<std::string> &keywords) const override {</std::string>

    keywords.insert(keywords.end(),

                    {"table", "tab", "col", "cam", "camera", "peg", "pegbar"});

  }

  void createNode(Calculator *calc, std::vector<calculatornode *=""> &stack,</calculatornode>

                  const std::vector<token> &tokens) const override {</token>

    assert(tokens.size() >= 3);

    std::unique_ptr<calculatornode> frameNode(</calculatornode>

        (tokens.size() == 6) ? popNode(stack)

                             : new VariableNode(calc, CalculatorNode::FRAME));

    TStageObjectId objectId = matchObjectName(tokens[0]);

    std::string field = toLower(tokens[2].getText());

    if (field == "cell" || field == "cel" || field == "cels") {

      int columnIndex = objectId.getIndex();

      stack.push_back(new XsheetDrawingCalculatorNode(calc, m_xsh, columnIndex,

                                                      std::move(frameNode)));

    } else {

      // do not create object if it does not exist

      TStageObject *object =

          m_xsh->getStageObjectTree()->getStageObject(objectId, false);

      if (!object) return;

      TStageObject::Channel channelName = matchChannelName(tokens[2]);

      TDoubleParam *channel             = object->getParam(channelName);

      if (channel) {

        if (objectId.isColumn())

          stack.push_back(new ColumnParamCalculatorNode(

              calc, channel, std::move(frameNode), objectId.getIndex()));

        else

          stack.push_back(

              new ParamCalculatorNode(calc, channel, std::move(frameNode)));

      }

    }

  }

};

//-------------------------------------------------------------------

class FxReferencePattern final : public Pattern {

  TXsheet *m_xsh;

public:

  FxReferencePattern(TXsheet *xsh) : m_xsh(xsh) {}

  TFx *getFx(const Token &token) const {

    TFx *fx =

        m_xsh->getFxDag()->getFxById(::to_wstring(toLower(token.getText())));

    // removed fx cannot be referenced

    if (!fx)

      return nullptr;

    else if (fx->isZerary()) {

      TZeraryFx *zFx = dynamic_cast<tzeraryfx *="">(fx);</tzeraryfx>

      // For now we cannot use zFx->getColumnFx()->getColumnIndex() < 0 to check

      // existence of the column. See a comment in tcolumnset.h for details.

      if (!zFx || !zFx->getColumnFx()->getXshColumn()->inColumnsSet())

        return nullptr;

    } else if (!m_xsh->getFxDag()->getInternalFxs()->containsFx(fx))

      return nullptr;

    return fx;

  }

  TParam *getParam(const TFx *fx, const Token &token) const {

    int i;

    for (i = 0; i < fx->getParams()->getParamCount(); i++) {

      TParam *param         = fx->getParams()->getParam(i);

      std::string paramName = ::to_string(

          TStringTable::translate(fx->getFxType() + "." + param->getName()));

      int i = paramName.find_first_of(" -");

      while (i != std::string::npos) {

        paramName.erase(i, 1);

        i = paramName.find_first_of(" -");

      }

      std::string paramNameToCheck = token.getText();

      if (paramName == paramNameToCheck ||

          toLower(paramName) == toLower(paramNameToCheck))

        return param;

      // in case the parameter has ui label

      // ( parameters of plugin fxs and intensity of GlobalControllableFx)

      if (param->hasUILabel()) {

        paramName = param->getUILabel();

        int i     = paramName.find_first_of(" -");

        while (i != std::string::npos) {

          paramName.erase(i, 1);

          i = paramName.find_first_of(" -");

        }

        if (paramName == paramNameToCheck ||

            toLower(paramName) == toLower(paramNameToCheck))

          return param;

      }

    }

    return 0;

  }

  TParam *getLeafParam(const TFx *fx, const TParamSet *paramSet,

                       const Token &token) const {

    int i;

    for (i = 0; i < paramSet->getParamCount(); i++) {

      TParam *param         = paramSet->getParam(i).getPointer();

      std::string paramName = param->getName();

      int i                 = paramName.find(" ");

      while (i != std::string::npos) {

        paramName.erase(i, 1);

        i = paramName.find(" ");

      }

      std::string paramNameToCheck = token.getText();

      if (paramName == paramNameToCheck ||

          toLower(paramName) == toLower(paramNameToCheck))

        return param;

    }

    return 0;

  }

  std::string getFirstKeyword() const override { return "fx"; }

  bool expressionExpected(

      const std::vector<token> &previousTokens) const override {</token>

    return !previousTokens.empty() && previousTokens.back().getText() == "(";

  }

  bool matchToken(const std::vector<token> &previousTokens,</token>

                  const Token &token) const override {

    int i         = (int)previousTokens.size();

    std::string s = toLower(token.getText());

    if (i == 0 && s == "fx")

      return true;

    else if (i == 1)

      return s == ".";

    else if (i & 1) {

      if (previousTokens[i - 2].getText() == "(")

        return s == ")";

      else

        return s == "." || s == "(";

    } else if (i == 2) {

      // nome fx

      return getFx(token) != 0;

    } else if (i == 4) {

      TFx *fx = getFx(previousTokens[2]);

      if (!fx) return false;

      TParam *param = getParam(fx, token);

      return !!param;

    } else if (i == 6) {

      TFx *fx = getFx(previousTokens[2]);

      if (!fx) return false;

      TParam *param       = getParam(fx, previousTokens[4]);

      TParamSet *paramSet = dynamic_cast<tparamset *="">(param);</tparamset>

      if (!paramSet) return false;

      TParam *leafParam = getLeafParam(fx, paramSet, token);

      return !!param;

    } else

      return false;

  }

  bool isFinished(const std::vector<token> &previousTokens,</token>

                  const Token &token) const override {

    return !previousTokens.empty() && previousTokens.back().getText() == ")";

  }

  bool isComplete(const std::vector<token> &previousTokens,</token>

                  const Token &token) const override {

    int n = (int)previousTokens.size();

    return n >= 2 && (n & 1) == 1 && previousTokens[n - 2].getText() != "(";

  }

  TSyntax::TokenType getTokenType(const std::vector<token> &previousTokens,</token>

                                  const Token &token) const override {

    return TSyntax::Operator;

  }

  void createNode(Calculator *calc, std::vector<calculatornode *=""> &stack,</calculatornode>

                  const std::vector<token> &tokens) const override {</token>

    int tokenSize = tokens.size();

    std::unique_ptr<calculatornode> frameNode(</calculatornode>

        (tokenSize > 0 && tokens.back().getText() == ")")

            ? popNode(stack)

            : new VariableNode(calc, CalculatorNode::FRAME));

    TFx *fx = getFx(tokens[2]);

    if (!fx || tokenSize < 4) return;

    TParamP param = getParam(fx, tokens[4]);

    if (!param.getPointer()) return;

    TDoubleParamP channel;

    TParamSet *paramSet = dynamic_cast<tparamset *="">(param.getPointer());</tparamset>

    if (paramSet && tokenSize > 6)

      channel =

          dynamic_cast<tdoubleparam *="">(getLeafParam(fx, paramSet, tokens[6]));</tdoubleparam>

    else

      channel = param;

    if (channel.getPointer())

      stack.push_back(

          new ParamCalculatorNode(calc, channel, std::move(frameNode)));

  }

};

//-------------------------------------------------------------------

class PlasticVertexPattern final : public Pattern {

  TXsheet *m_xsh;

  /*

Full pattern layout:

vertex ( columnNumber , " vertexName " ) . component (  expr )

   0   1      2       3 4      5     6 7 8     9     10  11  12

*/

  enum Positions {

    OBJECT,

    L1,

    COLUMN_NUMBER,

    COMMA,

    QUOTE1,

    VERTEX_NAME,

    QUOTE2,

    R1,

    SELECTOR,

    COMPONENT,

    L2,

    EXPR,

    R2,

    POSITIONS_COUNT

  };

public:

  PlasticVertexPattern(TXsheet *xsh) : m_xsh(xsh) {

    setDescription(

        "vertex(columnNumber, \"vertexName\").action\nVertex data\n"

        "columnNumber must be the number of the column containing the desired "

        "skeleton\n"

        "vertexName must be the name of a Plastic Skeleton vertex\n"

        "action must be one of the parameter names available for a Plastic "

        "Skeleton vertex");

  }

  std::string getFirstKeyword() const override { return "vertex"; }

  bool expressionExpected(

      const std::vector<token> &previousTokens) const override {</token>

    return (previousTokens.size() == EXPR);

  }

  bool matchToken(const std::vector<token> &previousTokens,</token>

                  const Token &token) const override {

    struct {

      const PlasticVertexPattern *m_this;

      const SkD *skdp(const Token &columnToken) {

        int colIdx = columnToken.getIntValue() -

                     1;  // The first column (1) actually starts at index 0

        if (!m_this->m_xsh->isColumnEmpty(colIdx)) {

          TStageObject *obj =

              m_this->m_xsh->getStageObject(TStageObjectId::ColumnId(colIdx));

          assert(obj);

          if (const SkDP &skdp = obj->getPlasticSkeletonDeformation())

            return skdp.getPointer();

        }

        return 0;

      }

    } locals = {this};

    const std::string &text = token.getText();

    int pos                 = previousTokens.size();

    if (!m_fixedTokens[pos].empty()) return (text == m_fixedTokens[pos]);

    switch (pos) {

    case COLUMN_NUMBER:

      return (token.getType() == Token::Number && locals.skdp(token));

    case VERTEX_NAME:

      if (const SkD *skdp = locals.skdp(previousTokens[COLUMN_NUMBER])) {

        const QString &vertexName = QString::fromStdString(text);

        return (skdp->vertexDeformation(vertexName) != 0);

      }

      break;

    case COMPONENT:

      return std::count(m_components,

                        m_components + sizeof(m_components) / sizeof(Component),

                        text) > 0;

    }

    return false;

  }

  bool isFinished(const std::vector<token> &previousTokens,</token>

                  const Token &token) const override {

    return (previousTokens.size() >= POSITIONS_COUNT);

  }

  bool isComplete(const std::vector<token> &previousTokens,</token>

                  const Token &token) const override {

    return (previousTokens.size() >= POSITIONS_COUNT ||

            previousTokens.size() == L2);

  }

  TSyntax::TokenType getTokenType(const std::vector<token> &previousTokens,</token>

                                  const Token &token) const override {

    return TSyntax::Operator;

  }

  void createNode(Calculator *calc, std::vector<calculatornode *=""> &stack,</calculatornode>

                  const std::vector<token> &tokens) const override {</token>

    assert(tokens.size() > COMPONENT);

    std::unique_ptr<calculatornode> frameNode(</calculatornode>

        (tokens.size() == POSITIONS_COUNT)

            ? popNode(stack)

            : new VariableNode(calc, CalculatorNode::FRAME));

    int colIdx = tokens[COLUMN_NUMBER].getIntValue() - 1;

    if (!m_xsh->isColumnEmpty(colIdx)) {

      TStageObject *obj =

          m_xsh->getStageObject(TStageObjectId::ColumnId(colIdx));

      assert(obj);

      if (const SkDP &skdp = obj->getPlasticSkeletonDeformation()) {

        const QString &vertexName =

            QString::fromStdString(tokens[VERTEX_NAME].getText());

        if (SkVD *skvd = skdp->vertexDeformation(vertexName)) {

          const Component *componentsEnd = m_components + sizeof(m_components) /

                                                              sizeof(Component),

                          *component = std::find(m_components, componentsEnd,

                                                 tokens[COMPONENT].getText());

          if (component != componentsEnd) {

            const TDoubleParamP ¶m =

                skvd->m_params[component->m_paramId].getPointer();

            stack.push_back(

                new ParamCalculatorNode(calc, param, std::move(frameNode)));

          }

        }

      }

    }

  }

private:

  struct Component {

    std::string m_name;

    SkVD::Params m_paramId;

    bool operator==(const std::string &name) const { return (m_name == name); }

  };

private:

  static const std::string m_fixedTokens[POSITIONS_COUNT];

  static const Component m_components[5];

};

const std::string PlasticVertexPattern::m_fixedTokens[POSITIONS_COUNT] = {

    "vertex", "(", "", ",", "\"", "", "\"", ")", ".", "", "(", "", ")"};

const PlasticVertexPattern::Component PlasticVertexPattern::m_components[] = {

    {"ang", SkVD::ANGLE},

    {"angle", SkVD::ANGLE},

    {"dist", SkVD::DISTANCE},

    {"distance", SkVD::DISTANCE},

    {"so", SkVD::SO}};

}  // namespace

//******************************************************************************

//    API functions

//******************************************************************************

TSyntax::Grammar *createXsheetGrammar(TXsheet *xsh) {

  Grammar *grammar = new Grammar();

  grammar->addPattern(new XsheetReferencePattern(xsh));

  grammar->addPattern(new FxReferencePattern(xsh));

  grammar->addPattern(new PlasticVertexPattern(xsh));

  return grammar;

}

bool dependsOn(TExpression &expr, TDoubleParam *possiblyDependentParam) {

  ParamDependencyFinder pdf(possiblyDependentParam);

  expr.accept(pdf);

  return pdf.found();

}

bool dependsOn(TDoubleParam *param, TDoubleParam *possiblyDependentParam) {

  ParamDependencyFinder pdf(possiblyDependentParam);

  param->accept(pdf);

  return pdf.found();

}

void referenceParams(TExpression &expr, QSet<int> &columnIndices,</int>

                     QSet<tdoubleparam *=""> ¶ms) {</tdoubleparam>

  ParamReferenceFinder prf;

  expr.accept(prf);

  columnIndices = prf.columnIndices();

  params        = prf.refParams();

}