Dune Core Modules (2.8.0)

projection.hh
1// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2// vi: set et ts=4 sw=2 sts=2:
3#ifndef DUNE_DGF_PROJECTIONBLOCK_HH
4#define DUNE_DGF_PROJECTIONBLOCK_HH
5
6#include <map>
7
8#include <dune/grid/common/boundaryprojection.hh>
9#include <dune/grid/io/file/dgfparser/blocks/basic.hh>
10
11namespace Dune
12{
13
14 namespace dgf
15 {
16
17 // ProjectionBlock
18 // ---------------
19
20 class ProjectionBlock
21 : public BasicBlock
22 {
23 struct Token
24 {
25 friend std::ostream &operator<< ( std::ostream &, const Token & );
26
27 enum Type
28 {
29 string, number,
30 defaultKeyword, functionKeyword, segmentKeyword,
31 sqrtKeyword, sinKeyword, cosKeyword, piKeyword,
32 comma,
33 equals,
34 openingParen, closingParen, openingBracket, closingBracket, normDelim,
35 additiveOperator, multiplicativeOperator, powerOperator,
36 endOfLine
37 };
38
39 Type type;
40 char symbol;
41 std::string literal;
42 double value;
43
44 void setSymbol ( const Type &t, char c )
45 {
46 type = t;
47 symbol = c;
48 }
49 };
50
51 friend std::ostream &operator<< ( std::ostream &, const Token & );
52
53 public:
54 struct Expression;
55
56 typedef std::shared_ptr< Expression > ExpressionPointer;
57 typedef std::pair< ExpressionPointer, std::string > ExpressionPair ;
58
59 private:
60 template< int dimworld >
61 class BoundaryProjection;
62
63 void registerProjectionFactory( const int dimworld );
64
65 static const char* blockId() { return "Projection"; }
66 public:
67 ProjectionBlock ( std::istream &in, int dimworld );
68
69 template< int dimworld >
70 const DuneBoundaryProjection< dimworld > *defaultProjection () const
71 {
72 if( defaultFunction_.first )
73 {
74 return new BoundaryProjection< dimworld >( defaultFunction_ );
75 }
76 else
77 return 0;
78 }
79
80 size_t numBoundaryProjections () const
81 {
82 return boundaryFunctions_.size();
83 }
84
85 const std::vector< unsigned int > &boundaryFace ( const size_t i ) const
86 {
87 assert( i < numBoundaryProjections() );
88 return boundaryFunctions_[ i ].first;
89 }
90
91 template< int dimworld >
92 const DuneBoundaryProjection< dimworld > *boundaryProjection ( const size_t i ) const
93 {
94 assert( i < numBoundaryProjections() );
95 return new BoundaryProjection< dimworld >( boundaryFunctions_[ i ].second );
96 }
97
98 ExpressionPointer function ( const std::string &name ) const
99 {
100 const FunctionMap::const_iterator it = functions_.find( name );
101 return (it != functions_.end() ? it->second.first : 0);
102 }
103
104 ExpressionPair lastFunctionInserted () const
105 {
106 assert( ! functions_.empty() );
107 return functions_.begin()->second;
108 }
109
110 static ProjectionBlock::ExpressionPair createExpression( const std::string& funcexpr, const int dimworld )
111 {
112 std::stringstream str;
113 str << blockId() << std::endl;
114 str << funcexpr << std::endl;
115 str << "#" << std::endl;
116 ProjectionBlock problock( str, dimworld );
117 return problock.lastFunctionInserted();
118 }
119
120
121
122 private:
123 void parseFunction ( const std::string& exprname );
124 ExpressionPointer parseBasicExpression ( const std::string &variableName );
125 ExpressionPointer parsePostfixExpression ( const std::string &variableName );
126 ExpressionPointer parseUnaryExpression ( const std::string &variableName );
127 ExpressionPointer parsePowerExpression ( const std::string &variableName );
128 ExpressionPointer parseMultiplicativeExpression ( const std::string &variableName );
129 ExpressionPointer parseExpression ( const std::string &variableName );
130 void parseDefault ();
131 void parseSegment ();
132
133 void matchToken ( const Token::Type &type, const std::string &message );
134 void nextToken ();
135
136 static char lowerCase ( char c )
137 {
138 return ((c >= 'A') && (c <= 'Z') ? c + ('a' - 'A') : c);
139 }
140
141 protected:
142 typedef std::map< std::string, ExpressionPair > FunctionMap;
143 typedef std::pair< std::vector< unsigned int >, ExpressionPair > BoundaryFunction;
144
145 using BasicBlock::line;
146
147 Token token;
148 FunctionMap functions_;
149 ExpressionPair defaultFunction_;
150 std::vector< BoundaryFunction > boundaryFunctions_;
151 };
152
153
154 std::ostream &operator<< ( std::ostream &out, const ProjectionBlock::Token &token );
155
156
157 struct ProjectionBlock::Expression
158 {
159 typedef std::vector< double > Vector;
160
161 virtual ~Expression ()
162 {}
163
164 virtual void evaluate ( const Vector &argument, Vector &result ) const = 0;
165 };
166
167
168 template< int dimworld >
169 class ProjectionBlock::BoundaryProjection
170 : public DuneBoundaryProjection< dimworld >
171 {
172 typedef DuneBoundaryProjection< dimworld > Base;
173 typedef BoundaryProjection < dimworld > This;
174 typedef typename Base :: ObjectStreamType ObjectStreamType;
175
176 public:
177 typedef typename Base::CoordinateType CoordinateType;
178
179 BoundaryProjection ( const ExpressionPair& exprpair )
180 : expression_( exprpair.first ),
181 expressionName_( exprpair.second )
182 {}
183
184 BoundaryProjection( ObjectStreamType& buffer )
185 {
186 int size = 0;
187 buffer.read( (char *) &size, sizeof(int) );
188 expressionName_.resize( size );
189 buffer.read( (char *) expressionName_.c_str(), size );
190 expression_ = ProjectionBlock::createExpression( expressionName_, dimworld ).first;
191 }
192
193 virtual CoordinateType operator() ( const CoordinateType &global ) const override
194 {
195 std::vector< double > x( dimworld );
196 for( int i = 0; i < dimworld; ++i )
197 x[ i ] = global[ i ];
198 std::vector< double > y;
199 expression_->evaluate( x, y );
200 CoordinateType result;
201 for( int i = 0; i < dimworld; ++i )
202 result[ i ] = y[ i ];
203 return result;
204 }
205
206 // backup name of expression that should allow to recreate this class
207 virtual void backup( std::stringstream& buffer ) const override
208 {
209 buffer.write( (const char *) &key(), sizeof( int ));
210 int size = expressionName_.size();
211 buffer.write( (const char *) &size, sizeof(int) );
212 buffer.write( expressionName_.c_str(), size );
213 }
214
215 static void registerFactory()
216 {
217 if( key() < 0 )
218 {
219 key() = Base::template registerFactory< This >();
220 }
221 }
222
223 protected:
224 static int& key ()
225 {
226 static int k = -1;
227 return k;
228 }
229
230 ExpressionPointer expression_;
231 std::string expressionName_;
232 };
233
234 inline void ProjectionBlock::registerProjectionFactory( const int dimworld )
235 {
236 if( dimworld == 3 ) {
237 BoundaryProjection< 3 > :: registerFactory();
238 }
239 else if ( dimworld == 2 ) {
240 BoundaryProjection< 2 > :: registerFactory();
241 }
242 else if ( dimworld == 1 ) {
243 BoundaryProjection< 1 > :: registerFactory();
244 }
245 else {
246 DUNE_THROW(NotImplemented,"ProjectionBlock::registerProjectionFactory not implemented for dimworld = " << dimworld);
247 }
248 }
249
250 }
251
252}
253
254#endif // #ifndef DUNE_DGF_PROJECTIONBLOCK_HH
#define DUNE_THROW(E, m)
Definition: exceptions.hh:216
constexpr GeometryType line
GeometryType representing a line.
Definition: type.hh:510
constexpr auto equals(T1 &&t1, T2 &&t2)
Equality comparison.
Definition: hybridutilities.hh:400
Dune namespace.
Definition: alignedallocator.hh:11
FieldVector< double, dimworld > CoordinateType
type of coordinate vector
Definition: boundaryprojection.hh:40
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