KiCad PCB EDA Suite
class_am_param.cpp
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1 
5 /*
6  * This program source code file is part of KiCad, a free EDA CAD application.
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8  * Copyright (C) 1992-2017 Jean-Pierre Charras <jp.charras at wanadoo.fr>
9  * Copyright (C) 2010 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
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29 
30 #include <class_am_param.h>
31 #include <class_aperture_macro.h>
32 
33 extern int ReadInt( char*& text, bool aSkipSeparator = true );
34 extern double ReadDouble( char*& text, bool aSkipSeparator = true );
35 extern double Evaluate( AM_PARAM_EVAL_STACK& aExp );
36 
37 /* Class AM_PARAM
38  * holds a parameter value for an "aperture macro" as defined within
39  * standard RS274X. The parameter can be a constant, i.e. "immediate" parameter,
40  * or depend on some defered values, defined in a D_CODE, by the ADD command.
41  * Note the actual value could need an evaluation from an arithmetical expression
42  * items in the expression are stored in .
43  * A simple definition is just a value stored in one item in m_paramStack
44  */
46 {
47  m_index = -1;
48 }
49 
56 {
57  bool is_immediate = true;
58  for( unsigned ii = 0; ii < m_paramStack.size(); ii++ )
59  {
60  if( m_paramStack[ii].IsDefered() )
61  { // a defered value is found in operand list,
62  // so the parameter is not immediate
63  is_immediate = false;
64  break;
65  }
66  }
67  return is_immediate;
68 }
69 
70 double AM_PARAM::GetValue( const D_CODE* aDcode ) const
71 {
72  // In macros, actual values are sometimes given by an expression like:
73  // 0-$2/2-$4
74  // Because arithmetic predence is used, the parameters (values (double) and operators)
75  // are stored in a stack, with all numeric values converted to the actual values
76  // when they are defered parameters
77  // Each item is stored in a AM_PARAM_EVAL (a value or an operator)
78  //
79  // Then the stack with all values resolved is parsed and numeric values
80  // calculated according to the precedence of operators
81  double curr_value = 0.0;
82  parm_item_type op_code;
83 
85 
86  for( unsigned ii = 0; ii < m_paramStack.size(); ii++ )
87  {
88  AM_PARAM_ITEM item = m_paramStack[ii];
89 
90  switch( item.GetType() )
91  {
92  case ADD:
93  case SUB:
94  case MUL:
95  case DIV: // just an operator for next parameter value
96  case OPEN_PAR:
97  case CLOSE_PAR: // Priority modifiers: store in stack
98  op_code = item.GetType();
99  ops.push_back( AM_PARAM_EVAL( op_code ) );
100  break;
101 
102  case PUSHPARM:
103  // a defered value: get the actual parameter from the aDcode
104  if( aDcode ) // should be always true here
105  {
106  if( item.GetIndex() <= aDcode->GetParamCount() )
107  {
108  curr_value = aDcode->GetParam( item.GetIndex() );
109  }
110  else // Get parameter from local param definition
111  {
112  const APERTURE_MACRO * am_parent = aDcode->GetMacro();
113  curr_value = am_parent->GetLocalParam( aDcode, item.GetIndex() );
114  }
115  }
116  else
117  {
118  wxLogDebug( wxT( "AM_PARAM::GetValue(): NULL param aDcode\n" ) );
119  }
120 
121  ops.push_back( AM_PARAM_EVAL( curr_value ) );
122  break;
123 
124  case PUSHVALUE: // a value is on the stack:
125  curr_value = item.GetValue();
126  ops.push_back( AM_PARAM_EVAL( curr_value ) );
127 
128  default:
129  wxLogDebug( "AM_PARAM::GetValue(): unexpected type\n" );
130  break;
131  }
132  }
133 
134  double result = Evaluate( ops );
135 
136  return result;
137 }
138 
144 void AM_PARAM::PushOperator( parm_item_type aType, double aValue )
145 {
146  AM_PARAM_ITEM item( aType, aValue);
147  m_paramStack.push_back( item );
148 }
149 
150 void AM_PARAM::PushOperator( parm_item_type aType, int aValue )
151 {
152  AM_PARAM_ITEM item( aType, aValue);
153  m_paramStack.push_back( item );
154 }
155 
169 bool AM_PARAM::ReadParam( char*& aText )
170 {
171  bool found = false;
172  int ivalue;
173  double dvalue;
174  bool end = false;
175 
176  while( !end )
177  {
178  switch( *aText )
179  {
180  case ',':
181  aText++;
182  // fall through
183  case 0: // EOL
184  case '*': // Terminator in a gerber command
185  end = true;
186  break;
187 
188  case ' ':
189  aText++;
190  break;
191 
192  case '$':
193  // defered value defined later, in ADD command which define defered parameters
194  ++aText;
195  ivalue = ReadInt( aText, false );
196  if( m_index < 1 )
197  SetIndex( ivalue );
198  PushOperator( PUSHPARM, ivalue );
199  found = true;
200  break;
201 
202  case '/':
203  PushOperator( DIV );
204  aText++;
205  break;
206 
207  case '(': // Open a block to evaluate an expression between '(' and ')'
209  aText++;
210  break;
211 
212  case ')': // close a block between '(' and ')'
214  aText++;
215  break;
216 
217  case 'x':
218  case 'X':
219  PushOperator( MUL );
220  aText++;
221  break;
222 
223  case '-':
224  case '+':
225  // Test if this is an operator between 2 params, or the sign of a value
226  if( m_paramStack.size() > 0 && !m_paramStack.back().IsOperator() )
227  { // Seems an operator
228  PushOperator( *aText == '+' ? ADD : SUB );
229  aText++;
230  }
231  else
232  { // seems the sign of a value
233  dvalue = ReadDouble( aText, false );
234  PushOperator( PUSHVALUE, dvalue );
235  found = true;
236  }
237  break;
238 
239  case '=': // A local definition found like $4=$3/2
240  // At this point, one defered parameter is expected to be read.
241  // this parameter value (the index) is stored in m_index.
242  // The list of items is cleared
243  aText++;
244  m_paramStack.clear();
245  found = false;
246  break;
247 
248  default:
249  dvalue = ReadDouble( aText, false );
250  PushOperator( PUSHVALUE, dvalue );
251  found = true;
252  break;
253  }
254  }
255 
256  return found;
257 }
std::vector< AM_PARAM_ITEM > m_paramStack
std::vector< AM_PARAM_EVAL > AM_PARAM_EVAL_STACK
double ReadDouble(char *&text, bool aSkipSeparator=true)
Function ReadDouble reads a double from an ASCII character buffer.
double GetParam(unsigned aIdx) const
GetParam() Returns a parameter stored in parameter list.
Definition: dcode.h:142
unsigned GetIndex() const
Class AM_PARAM holds an operand for an AM_PARAM as defined within standard RS274X.
bool ReadParam(char *&aText)
Function ReadParam Read one aperture macro parameter a parameter can be: a number a reference to an a...
void PushOperator(parm_item_type aType, double aValue)
function PushOperator add an operator/operand to the current stack
double Evaluate(AM_PARAM_EVAL_STACK &aExp)
Evaluate an basic arithmetic expression (infix notation) with precedence The expression is a sequence...
Definition: evaluate.cpp:102
parm_item_type GetType() const
double GetValue(const D_CODE *aDcode) const
unsigned GetParamCount() const
GetParamCount() Returns the number of parameters stored in parameter list.
Definition: dcode.h:132
bool IsImmediate() const
Function IsImmediate tests if this AM_PARAM holds an immediate parameter or is a pointer into a param...
This helper class hold a value or an arithmetic operator to calculate the final value of a aperture m...
double GetLocalParam(const D_CODE *aDcode, unsigned aParamId) const
function GetLocalParam Usually, parameters are defined inside the aperture primitive using immediate ...
int ReadInt(char *&text, bool aSkipSeparator=true)
Function ReadInt reads an int from an ASCII character buffer.
Class D_CODE holds a gerber DCODE (also called Aperture) definition.
Definition: dcode.h:81
parm_item_type
double GetValue() const
APERTURE_MACRO * GetMacro() const
Definition: dcode.h:158
void SetIndex(int aIndex)
Struct APERTURE_MACRO helps support the "aperture macro" defined within standard RS274X.