1 | #ifndef __XIOS_SCALAR_EXPR_NODE_HPP__ |
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2 | #define __XIOS_SCALAR_EXPR_NODE_HPP__ |
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3 | |
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4 | #include <string> |
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5 | #include <boost/smart_ptr/scoped_ptr.hpp> |
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6 | |
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7 | namespace xios |
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8 | { |
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9 | /*! |
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10 | * Interface implemented by all the nodes of a tree representing an expression |
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11 | * which can be reduced to a scalar value. |
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12 | */ |
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13 | struct IScalarExprNode |
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14 | { |
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15 | /*! |
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16 | * Builds a filter graph corresponding to the expression tree. |
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17 | * |
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18 | * \return the output pin of the filter producing the result of the expression |
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19 | */ |
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20 | virtual double reduce() const = 0; |
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21 | }; |
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22 | |
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23 | /*! |
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24 | * Expression node corresponding to a scalar value. |
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25 | */ |
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26 | class CScalarValExprNode : public IScalarExprNode |
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27 | { |
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28 | public: |
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29 | /*! |
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30 | * Constructs an expression node corresponding to the specified scalar value. |
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31 | * |
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32 | * \param strVal the string representation of the scalar value |
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33 | */ |
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34 | CScalarValExprNode(const std::string& strVal); |
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35 | |
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36 | double reduce() const; |
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37 | |
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38 | private: |
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39 | std::string strVal; //!< The string representation of the scalar value |
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40 | }; |
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41 | |
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42 | /*! |
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43 | * Expression node corresponding to a scalar variable. |
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44 | */ |
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45 | class CScalarVarExprNode : public IScalarExprNode |
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46 | { |
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47 | public: |
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48 | /*! |
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49 | * Constructs an expression node corresponding |
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50 | * to the scalar variable whose id is provided. |
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51 | * |
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52 | * \param varId the identifier of the scalar variable |
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53 | */ |
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54 | CScalarVarExprNode(const std::string& varId); |
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55 | |
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56 | double reduce() const; |
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57 | |
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58 | private: |
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59 | std::string varId; //!< The identifier of the field |
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60 | }; |
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61 | |
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62 | /*! |
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63 | * Expression node corresponding to a unary operation on a scalar. |
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64 | */ |
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65 | class CScalarUnaryOpExprNode : public IScalarExprNode |
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66 | { |
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67 | public: |
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68 | /*! |
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69 | * Constructs an expression node corresponding to the specified unary operation |
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70 | * applied to the provided scalar node. |
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71 | * Note that the child node will be destroyed automatically when the parent node |
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72 | * is destroyed. |
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73 | * |
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74 | * \param opId the identifier of the operator |
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75 | * \param child the scalar child node to which the operator is applied |
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76 | */ |
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77 | CScalarUnaryOpExprNode(const std::string& opId, IScalarExprNode* child); |
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78 | |
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79 | double reduce() const; |
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80 | |
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81 | private: |
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82 | std::string opId; //!< The identifier of the field |
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83 | boost::scoped_ptr<IScalarExprNode> child; //!< The scalar child node to which the operator is applied |
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84 | }; |
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85 | |
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86 | /*! |
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87 | * Expression node corresponding to a binary operation on two scalars. |
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88 | */ |
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89 | class CScalarBinaryOpExprNode : public IScalarExprNode |
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90 | { |
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91 | public: |
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92 | /*! |
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93 | * Constructs an expression node corresponding to the specified binary operation |
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94 | * applied to the provided scalar child nodes. |
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95 | * Note that the child nodes will be destroyed automatically when the parent node |
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96 | * is destroyed. |
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97 | * |
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98 | * \param opId the identifier of the operator |
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99 | * \param child1, child2 the scalar child nodes to which the operator is applied |
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100 | */ |
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101 | CScalarBinaryOpExprNode(IScalarExprNode* child1, const std::string& opId, IScalarExprNode* child2); |
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102 | |
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103 | double reduce() const; |
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104 | |
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105 | private: |
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106 | std::string opId; //!< The identifier of the field |
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107 | boost::scoped_ptr<IScalarExprNode> child1, child2; //!< The scalar child nodes to which the operator is applied |
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108 | }; |
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109 | |
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110 | class CScalarTernaryOpExprNode : public IScalarExprNode |
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111 | { |
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112 | public: |
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113 | /*! |
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114 | * Constructs an expression node corresponding to the specified ternary operation |
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115 | * applied to the provided scalar child nodes. |
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116 | * Note that the child nodes will be destroyed automatically when the parent node |
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117 | * is destroyed. |
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118 | * |
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119 | * \param opId the identifier of the operator |
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120 | * \param child1, child2 , child3 the scalar child nodes to which the operator is applied |
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121 | */ |
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122 | CScalarTernaryOpExprNode(IScalarExprNode* child1, const std::string& opId, IScalarExprNode* child2, IScalarExprNode* child3); |
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123 | |
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124 | double reduce() const; |
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125 | |
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126 | private: |
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127 | std::string opId; //!< The identifier of the field |
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128 | boost::scoped_ptr<IScalarExprNode> child1, child2, child3; //!< The scalar child nodes to which the operator is applied |
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129 | }; |
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130 | } |
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131 | |
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132 | #endif // __XIOS_SCALAR_EXPR_NODE_HPP__ |
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