1 /* 2 * Copyright 2007-2008, Christof Lutteroth, lutteroth@cs.auckland.ac.nz 3 * Copyright 2007-2008, James Kim, jkim202@ec.auckland.ac.nz 4 * Distributed under the terms of the MIT License. 5 */ 6 7 8 #include "Column.h" 9 10 #include "ALMLayout.h" 11 #include "OperatorType.h" 12 #include "XTab.h" 13 14 #include <SupportDefs.h> 15 16 17 /** 18 * The left boundary of the column. 19 */ 20 XTab* 21 Column::Left() const 22 { 23 return fLeft; 24 } 25 26 27 /** 28 * The right boundary of the column. 29 */ 30 XTab* 31 Column::Right() const 32 { 33 return fRight; 34 } 35 36 37 /** 38 * Gets the column directly to the left of this column. 39 */ 40 Column* 41 Column::Previous() const 42 { 43 return fPrevious; 44 } 45 46 47 /** 48 * Sets the column directly to the left of this column. 49 * May be null. 50 */ 51 void 52 Column::SetPrevious(Column* value) 53 { 54 // if there should be no column directly left of this column, then we have to 55 // separate any such column and can remove any constraint that was used 56 // to glue this column to it 57 if (value == NULL) { 58 if (fPrevious == NULL) return; 59 fPrevious->fNext = NULL; 60 fPrevious->fNextGlue = NULL; 61 fPrevious = NULL; 62 delete fPreviousGlue; 63 fPreviousGlue = NULL; 64 return; 65 } 66 67 // otherwise we have to set up the pointers and the glue constraint accordingly 68 if (value->fNext != NULL) 69 value->SetNext(NULL); 70 if (fPrevious != NULL) 71 SetPrevious(NULL); 72 73 fPrevious = value; 74 fPrevious->fNext = this; 75 value->fNextGlue = value->fRight->IsEqual(fLeft); 76 fPreviousGlue = value->fNextGlue; 77 } 78 79 80 /** 81 * Gets the column directly to the right of this column. 82 */ 83 Column* 84 Column::Next() const 85 { 86 return fNext; 87 } 88 89 90 /** 91 * Sets the column directly to the right of this column. 92 * May be null. 93 */ 94 void 95 Column::SetNext(Column* value) 96 { 97 // if there should be no column directly right of this column, then we have to 98 // separate any such column and can remove any constraint that was used 99 // to glue this column to it 100 if (value == NULL) { 101 if (fNext == NULL) return; 102 fNext->fPrevious = NULL; 103 fNext->fPreviousGlue = NULL; 104 fNext = NULL; 105 delete fNextGlue; 106 fNextGlue = NULL; 107 return; 108 } 109 110 // otherwise we have to set up the pointers and the glue constraint accordingly 111 if (value->fPrevious != NULL) 112 value->SetPrevious(NULL); 113 if (fNext != NULL) 114 SetNext(NULL); 115 116 fNext = value; 117 fNext->fPrevious = this; 118 value->fPreviousGlue = fRight->IsEqual(value->fLeft); 119 fNextGlue = value->fPreviousGlue; 120 } 121 122 123 /** 124 * Inserts the given column directly to the left of this column. 125 * 126 * @param column the column to insert 127 */ 128 void 129 Column::InsertBefore(Column* column) 130 { 131 SetPrevious(column->fPrevious); 132 SetNext(column); 133 } 134 135 136 /** 137 * Inserts the given column directly to the right of this column. 138 * 139 * @param column the column to insert 140 */ 141 void 142 Column::InsertAfter(Column* column) 143 { 144 SetNext(column->fNext); 145 SetPrevious(column); 146 } 147 148 149 /** 150 * Constrains this column to have the same width as the given column. 151 * 152 * @param column the column that should have the same width 153 * @return the resulting same-width constraint 154 */ 155 Constraint* 156 Column::HasSameWidthAs(Column* column) 157 { 158 Constraint* constraint = fLS->AddConstraint( 159 -1.0, fLeft, 1.0, fRight, 1.0, column->fLeft, -1.0, column->fRight, 160 OperatorType(EQ), 0.0); 161 fConstraints.AddItem(constraint); 162 return constraint; 163 } 164 165 166 ConstraintList* 167 Column::Constraints() const 168 { 169 return const_cast<ConstraintList*>(&fConstraints); 170 } 171 172 173 /** 174 * Destructor. 175 * Removes the column from the specification. 176 */ 177 Column::~Column() 178 { 179 if (fPrevious != NULL) 180 fPrevious->SetNext(fNext); 181 for (int32 i = 0; i < fConstraints.CountItems(); i++) 182 delete fConstraints.ItemAt(i); 183 delete fLeft; 184 delete fRight; 185 } 186 187 188 /** 189 * Constructor. 190 */ 191 Column::Column(LinearSpec* ls) 192 { 193 fLS = ls; 194 fLeft = new XTab(ls); 195 fRight = new XTab(ls); 196 } 197 198