[378e808] | 1 | """ |
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| 2 | Widget for parameter constraints. |
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| 3 | """ |
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[6b0c2f6] | 4 | from numpy import * |
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| 5 | |
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[378e808] | 6 | from PyQt5 import QtCore |
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| 7 | from PyQt5 import QtGui |
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| 8 | from PyQt5 import QtWidgets |
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| 9 | |
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| 10 | import sas.qtgui.Utilities.GuiUtils as GuiUtils |
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| 11 | |
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| 12 | # Local UI |
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| 13 | from sas.qtgui.Perspectives.Fitting.UI.MultiConstraintUI import Ui_MultiConstraintUI |
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| 14 | |
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| 15 | class MultiConstraint(QtWidgets.QDialog, Ui_MultiConstraintUI): |
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| 16 | def __init__(self, parent=None, params=None): |
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| 17 | super(MultiConstraint, self).__init__() |
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| 18 | |
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| 19 | self.setupUi(self) |
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| 20 | self.setFixedSize(self.minimumSizeHint()) |
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| 21 | self.setModal(True) |
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| 22 | self.params = params |
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| 23 | |
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| 24 | self.setupLabels() |
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| 25 | self.setupTooltip() |
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| 26 | |
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[6b0c2f6] | 27 | # Set param text control to the second parameter passed |
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| 28 | self.txtConstraint.setText(self.params[1]) |
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| 29 | |
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[378e808] | 30 | self.cmdOK.clicked.connect(self.accept) |
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| 31 | self.cmdRevert.clicked.connect(self.revert) |
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[6b0c2f6] | 32 | self.txtConstraint.editingFinished.connect(self.validateFormula) |
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[378e808] | 33 | |
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| 34 | def revert(self): |
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| 35 | """ |
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| 36 | switch M1 <-> M2 |
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| 37 | """ |
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| 38 | self.params[1], self.params[0] = self.params[0], self.params[1] |
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| 39 | self.setupLabels() |
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| 40 | self.setupTooltip() |
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| 41 | |
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| 42 | def setupLabels(self): |
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| 43 | """ |
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| 44 | Setup labels based on current parameters |
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| 45 | """ |
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| 46 | l1 = self.params[0] |
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| 47 | l2 = self.params[1] |
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| 48 | self.txtParam1.setText(l1) |
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| 49 | self.txtParam1_2.setText(l1) |
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| 50 | self.txtParam2.setText(l2) |
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| 51 | |
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| 52 | def setupTooltip(self): |
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| 53 | """ |
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| 54 | Tooltip for txtConstraint |
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| 55 | """ |
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| 56 | tooltip = "E.g.\n%s = 2.0 * (%s)\n" %(self.params[0], self.params[1]) |
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| 57 | tooltip += "%s = sqrt(%s) + 5"%(self.params[0], self.params[1]) |
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| 58 | self.txtConstraint.setToolTip(tooltip) |
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| 59 | |
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[6b0c2f6] | 60 | def validateFormula(self): |
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| 61 | """ |
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| 62 | Add visual cues when formula is incorrect |
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| 63 | """ |
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| 64 | formula_is_valid = False |
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| 65 | formula_is_valid = self.validateConstraint(self.txtConstraint.text()) |
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| 66 | if not formula_is_valid: |
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| 67 | self.cmdOK.setEnabled(False) |
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| 68 | self.txtConstraint.setStyleSheet("QLineEdit {background-color: red;}") |
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| 69 | else: |
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| 70 | self.cmdOK.setEnabled(True) |
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| 71 | self.txtConstraint.setStyleSheet("QLineEdit {background-color: white;}") |
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| 72 | |
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| 73 | def validateConstraint(self, constraint_text): |
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| 74 | """ |
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| 75 | Ensure the constraint has proper form |
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| 76 | """ |
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| 77 | # 0. none or empty |
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| 78 | if not constraint_text or not isinstance(constraint_text, str): |
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| 79 | return False |
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| 80 | |
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| 81 | param_str = str(self.params[1]) |
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| 82 | constraint_text = constraint_text.strip() |
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| 83 | |
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| 84 | # 1. just the parameter |
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| 85 | if param_str == constraint_text: |
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| 86 | return True |
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| 87 | |
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| 88 | # 2. ensure the text contains parameter name |
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| 89 | parameter_string_start = constraint_text.find(param_str) |
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| 90 | has_parameter_name = (parameter_string_start > -1) |
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| 91 | if not has_parameter_name: |
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| 92 | return False |
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| 93 | parameter_string_end = parameter_string_start + len(param_str) |
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| 94 | |
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| 95 | # 3. parameter name should be a separate word, but can have "()[]*+-/" around |
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| 96 | valid_neighbours = "()[]*+-/ " |
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| 97 | has_only_parameter = False |
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| 98 | start_loc = parameter_string_start -1 |
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| 99 | end_loc = parameter_string_end |
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| 100 | if not any([constraint_text[start_loc] == char for char in valid_neighbours]): |
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| 101 | return False |
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| 102 | if end_loc < len(constraint_text): |
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| 103 | if not any([constraint_text[end_loc] == char for char in valid_neighbours]): |
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| 104 | return False |
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| 105 | |
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| 106 | # 4. replace parameter name with "1" and try to evaluate the expression |
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| 107 | try: |
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| 108 | expression_to_evaluate = constraint_text.replace(param_str, "1.0") |
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| 109 | eval(expression_to_evaluate) |
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| 110 | except Exception: |
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| 111 | # Too many cases to cover individually, just a blanket |
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| 112 | # Exception should be sufficient |
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| 113 | # Note that in current numpy things like sqrt(-1) don't |
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| 114 | # raise but just return warnings |
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| 115 | return False |
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| 116 | |
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| 117 | return True |
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| 118 | |
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| 119 | |
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[378e808] | 120 | |
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