1 | #!/usr/bin/env python |
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2 | |
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3 | #************************************************************************* |
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4 | # Copyright (c) 2009 The University of Chicago, as Operator of Argonne |
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5 | # National Laboratory. |
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6 | # Copyright (c) 2009 The Regents of the University of California, as |
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7 | # Operator of Los Alamos National Laboratory. |
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8 | # This file is distributed subject to a Software License Agreement found |
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9 | # in the file LICENSE that is included with this distribution. |
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10 | #************************************************************************* |
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11 | |
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12 | '''@note: watch EPICS process variables and write them to an XML file |
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13 | |
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14 | @version: |
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15 | ########### SVN repository information ################### |
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16 | # $Date: 2009-11-06 15:49:21 +0000 (Fri, 06 Nov 2009) $ |
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17 | # $Author: jemian $ |
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18 | # $Revision: 75 $ |
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19 | # $URL$ |
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20 | # $Id: epics2www.py 75 2009-11-06 15:49:21Z jemian $ |
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21 | ########### SVN repository information ################### |
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22 | |
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23 | @note: for help with xml.dom, see http://docs.python.org/library/xml.dom.html |
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24 | ''' |
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25 | |
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26 | |
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27 | from xml.dom import minidom |
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28 | import datetime |
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29 | import copy |
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30 | |
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31 | |
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32 | class Epics2Www: |
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33 | '''watch PVs and write to XMl''' |
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34 | |
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35 | def __init__(self, settingsFile=None): |
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36 | '''prepare the settings file |
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37 | @param settingsFile: [string] name of XML file with settings''' |
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38 | self.rootElement = 'epics2www' |
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39 | self.Clear() |
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40 | self.SetSettingsFile(settingsFile) |
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41 | |
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42 | def GetDb(self): |
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43 | '''@return: database''' |
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44 | return self.db |
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45 | |
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46 | def GetSettingsFile(self): |
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47 | '''@return: name of XML settings file''' |
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48 | return self.settingsFile |
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49 | |
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50 | def SetSettingsFile(self, thefile): |
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51 | '''set the name of XML settings file |
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52 | @param thefile: [string] name of XML file with settings''' |
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53 | self.settingsFile = thefile |
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54 | |
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55 | def Clear(self): |
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56 | '''reset the internal data representation (db) to empty''' |
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57 | self.db = {} |
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58 | |
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59 | def NewPair(self, title=''): |
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60 | ''' create space in the database (db) for a new pair |
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61 | and sets defaults for fields |
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62 | |
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63 | @param title: [string] the title of the XY_pair set (default="") |
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64 | @return: the index number''' |
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65 | if self.CountPairs() == -1: |
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66 | self.db[u"pairs"] = [] |
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67 | pairdb = {} |
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68 | pairdb[u"@name"] = title |
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69 | pairdb[u"@selected"] = False |
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70 | self.db[u'pairs'].append(pairdb) |
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71 | return len(self.db[u'pairs'])-1 |
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72 | |
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73 | def GetPairTitle(self, pairnum): |
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74 | '''return the name of the XY_pair |
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75 | @param pairnum: [int] index number of the XY_pair''' |
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76 | return self.db[u"pairs"][pairnum][u"@name"] |
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77 | |
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78 | def SetPairTitle(self, pairnum, title): |
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79 | '''set the name of the XY_pair |
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80 | @param pairnum: [int] index number of the XY_pair' |
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81 | @param title: [string] name of the XY_pair''' |
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82 | self.db[u"pairs"][pairnum][u"@name"] = title |
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83 | |
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84 | def SelectPair(self, pairnum): |
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85 | '''set the "selected" attribute of the pair |
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86 | @param pairnum: [int] index number of the XY_pair''' |
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87 | for pair in self.db[u"pairs"]: # first, deselect all pairs |
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88 | pair[u"@selected"] = False |
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89 | self.db[u"pairs"][pairnum][u"@selected"] = True |
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90 | |
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91 | def GetSelectedPair(self): |
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92 | '''@return: index number of the "selected" pair (-1 if none selected)''' |
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93 | selected = -1 |
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94 | try: |
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95 | pairs = self.db[u"pairs"] |
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96 | for pairnum in range(len(pairs)): |
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97 | if pairs[pairnum][u"@selected"]: |
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98 | selected = pairnum |
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99 | break |
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100 | except: |
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101 | pass |
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102 | return selected |
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103 | |
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104 | def CountPairs(self): |
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105 | '''@return: number of pairs''' |
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106 | try: |
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107 | return len(self.db[u"pairs"]) |
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108 | except: |
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109 | return -1 |
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110 | |
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111 | def NewEpicsConfig(self, pairnum): |
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112 | '''Create internal space for a new EPICS configuration |
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113 | @param pairnum: [int] index number of the XY_pair''' |
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114 | pairdb = self.db[u"pairs"][pairnum] |
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115 | pairdb[u"epics"] = {} |
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116 | epicsdb = pairdb[u"epics"] |
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117 | for axis in ['x', 'y']: |
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118 | epicsdb[axis] = {} |
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119 | axisdb = epicsdb[axis] |
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120 | for field in wxmtxy_axis.field_list: |
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121 | axisdb[field] = "" |
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122 | axisdb[u"isMotorRec"] = False |
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123 | |
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124 | def GetEpicsConfig(self, pairnum): |
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125 | '''Get a deep copy Python dictionary of the current EPICS PV config. |
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126 | @param pairnum: [int] index number of the XY_pair |
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127 | @return: the current EPICS configuration''' |
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128 | return copy.deepcopy(self.db[u"pairs"][pairnum][u"epics"]) |
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129 | |
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130 | def SetEpicsConfig(self, pairnum, config): |
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131 | '''set the current EPICS configuration |
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132 | @param pairnum: [int] index number of the XY_pair |
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133 | @param config: Python dictionary of EPICS PV configuration''' |
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134 | pairdb = self.db[u"pairs"][pairnum] |
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135 | pairdb[u"epics"] = copy.deepcopy(config) |
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136 | |
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137 | def SetEpicsField(self, pairnum, axis, field, value): |
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138 | '''Define the EPICS config for a specific field |
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139 | @param pairnum: [int] index number of the XY_pair' |
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140 | @param axis: [string] "x" or "y"' |
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141 | @param field: [string] member of wxmtxy_axis.field_list' |
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142 | @param value: [string] value of this field''' |
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143 | try: |
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144 | axisdb = self.db[u"pairs"][pairnum][u"epics"][axis] |
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145 | axisdb[field] = value |
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146 | except: |
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147 | print "Could not assign EPICS field", pairnum, axis, field, value |
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148 | |
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149 | |
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150 | def NewTab(self, pairnum, title=''): |
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151 | ''' create space in the database (db) pair for a new tab |
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152 | and sets defaults for fields |
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153 | |
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154 | @param pairnum: [int] index number of the XY_pair |
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155 | @param title: the title of the pair set (default="") |
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156 | @return the index number''' |
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157 | pairdb = self.db[u"pairs"][pairnum] |
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158 | if not pairdb.has_key(u"tabs"): |
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159 | pairdb[u"tabs"] = [] |
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160 | tabdb = {} |
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161 | tabdb[u"@name"] = title |
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162 | tabdb[u"@selected"] = False |
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163 | pairdb[u"tabs"].append(tabdb) |
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164 | return len(pairdb[u"tabs"])-1 |
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165 | |
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166 | def GetTabTitle(self, pairnum, tabnum): |
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167 | '''return the name of the tab |
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168 | @param pairnum: [int] index number of the XY_pair |
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169 | @param tabnum: [int] index number of the Tab object''' |
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170 | return self.db[u"pairs"][pairnum][u"tabs"][tabnum][u"@name"] |
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171 | |
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172 | def SetTabTitle(self, pairnum, tabnum, title): |
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173 | '''set the name attribute of the tab |
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174 | @param pairnum: [int] index number of the XY_pair |
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175 | @param tabnum: [int] index number of the Tab object |
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176 | @param title: [string] title the Tab object''' |
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177 | self.db[u"pairs"][pairnum][u"tabs"][tabnum]["@name"] = title |
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178 | |
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179 | def SelectTab(self, pairnum, tabnum): |
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180 | '''set the selected attribute of the pair |
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181 | @param pairnum: [int] index number of the XY_pair |
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182 | @param tabnum: [int] index number of the Tab object''' |
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183 | pairdb = self.db[u"pairs"][pairnum] |
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184 | for tab in pairdb[u"tabs"]: # first, deselect all tabs |
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185 | tab[u"@selected"] = False |
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186 | pairdb[u"tabs"][tabnum][u"@selected"] = True |
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187 | |
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188 | def GetSelectedTab(self, pairnum): |
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189 | '''return the index number of the selected tab |
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190 | @param pairnum: [int] index number of the XY_pair''' |
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191 | selected = -1 |
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192 | try: |
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193 | tabs = self.db[u"pairs"][pairnum][u"tabs"] |
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194 | for tabnum in range(len(tabs)): |
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195 | if tabs[tabnum][u"@selected"]: |
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196 | selected = tabnum |
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197 | break |
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198 | except: |
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199 | pass |
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200 | return selected |
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201 | |
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202 | def CountTabs(self, pairnum): |
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203 | '''return the number of tabs |
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204 | @param pairnum: [int] index number of the XY_pair''' |
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205 | try: |
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206 | return len(self.db[u"pairs"][pairnum][u"tabs"]) |
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207 | except: |
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208 | return -1 |
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209 | |
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210 | def NewRow(self, pairnum, tabnum, title=''): |
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211 | ''' create space in the database (db) pair for a new tab |
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212 | and sets defaults for fields |
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213 | |
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214 | @param pairnum: [int] index number of the XY_pair |
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215 | @param tabnum: [int] index number of the Tab object |
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216 | @param title: the title of the Tab object (default="") |
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217 | @return the index number''' |
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218 | tabdb = self.db[u"pairs"][pairnum][u"tabs"][tabnum] |
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219 | if not tabdb.has_key(u"rows"): |
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220 | tabdb[u"rows"] = [] |
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221 | rowdb = {} |
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222 | rowdb[u"@name"] = title |
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223 | rowdb[u"@selected"] = False |
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224 | rowdb[u"@x"] = "" |
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225 | rowdb[u"@y"] = "" |
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226 | tabdb[u"rows"].append(rowdb) |
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227 | return len(tabdb[u"rows"])-1 |
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228 | |
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229 | def GetRowTitle(self, pairnum, tabnum, rownum): |
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230 | '''return the name of the row |
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231 | @param pairnum: [int] index number of the XY_pair |
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232 | @param tabnum: [int] index number of the Tab object |
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233 | @param rownum: [int] index number of the Row object''' |
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234 | tabdb = self.db[u"pairs"][pairnum][u"tabs"][tabnum] |
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235 | return tabdb[u"rows"][rownum][u"@name"] |
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236 | |
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237 | def SetRowTitle(self, pairnum, tabnum, rownum, title): |
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238 | '''set the name attribute of the row |
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239 | @param pairnum: [int] index number of the XY_pair |
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240 | @param tabnum: [int] index number of the Tab object |
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241 | @param rownum: [int] index number of the Row object |
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242 | @param title: [string] title the Tab object''' |
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243 | tabdb = self.db[u"pairs"][pairnum][u"tabs"][tabnum] |
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244 | tabdb[u"rows"][rownum][u"@name"] = title |
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245 | |
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246 | def GetRowXY(self, pairnum, tabnum, rownum): |
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247 | '''return the name of the row |
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248 | @param pairnum: [int] index number of the XY_pair |
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249 | @param tabnum: [int] index number of the Tab object |
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250 | @param rownum: [int] index number of the Row object''' |
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251 | tabdb = self.db[u"pairs"][pairnum][u"tabs"][tabnum] |
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252 | x = tabdb[u"rows"][rownum][u"@x"] |
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253 | y = tabdb[u"rows"][rownum][u"@y"] |
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254 | return x, y |
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255 | |
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256 | def SetRowXY(self, pairnum, tabnum, rownum, x, y): |
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257 | '''set the name attribute of the row |
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258 | @param pairnum: [int] index number of the XY_pair |
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259 | @param tabnum: [int] index number of the Tab object |
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260 | @param x: [float] X axis position |
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261 | @param y: [float] Y axis position''' |
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262 | tabdb = self.db[u"pairs"][pairnum][u"tabs"][tabnum] |
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263 | tabdb[u"rows"][rownum][u"@x"] = x |
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264 | tabdb[u"rows"][rownum][u"@y"] = y |
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265 | |
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266 | def CountRows(self, pairnum, tabnum): |
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267 | '''return the number of rows |
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268 | @param pairnum: [int] index number of the XY_pair |
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269 | @param tabnum: [int] index number of the Tab object''' |
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270 | try: |
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271 | return len(self.db[u"pairs"][pairnum][u"tabs"][tabnum][u"rows"]) |
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272 | except: |
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273 | return -1 |
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274 | |
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275 | def GetSelectedRow(self, pairnum, tabnum): |
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276 | '''return the index number of the selected row |
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277 | @param pairnum: [int] index number of the XY_pair |
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278 | @param tabnum: [int] index number of the Tab object''' |
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279 | selected = -1 |
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280 | try: |
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281 | rows = self.db[u"pairs"][pairnum][u"tabs"][tabnum][u"rows"] |
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282 | for rownum in range(len(rows)): |
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283 | if rows[rownum][u"@selected"]: |
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284 | selected = rownum |
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285 | break |
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286 | except: |
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287 | pass |
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288 | return selected |
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289 | |
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290 | def SelectRow(self, pairnum, tabnum, rownum): |
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291 | '''set the selected attribute of the pair |
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292 | @param pairnum: [int] index number of the XY_pair |
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293 | @param tabnum: [int] index number of the Tab object |
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294 | @param rownum: [int] index number of the Row object''' |
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295 | tabdb = self.db[u"pairs"][pairnum][u"tabs"][tabnum] |
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296 | for row in tabdb[u"rows"]: # first, deselect all rows |
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297 | row[u"@selected"] = False |
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298 | tabdb[u"rows"][rownum][u"@selected"] = True |
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299 | |
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300 | def ReadXmlFile(self): |
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301 | '''read the settings from a file into an internal dictionary (self.db) |
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302 | |
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303 | @note: this method uses xml.dom.minidom (built into all Pythons) |
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304 | @see: http://docs.python.org/library/xml.dom.minidom.html |
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305 | ''' |
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306 | try: |
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307 | doc = minidom.parse(self.settingsFile) # parse an XML file by name |
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308 | assert doc.documentElement.tagName == self.rootElement |
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309 | except IOError: |
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310 | return 'Could not read the XML file: ' + self.settingsFile |
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311 | except AssertionError: |
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312 | return 'XML root element is not ' + self.rootElement |
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313 | #... read all attributes from the root element |
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314 | docElem = doc.documentElement |
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315 | self.Clear() |
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316 | version = self._get_attribute(docElem, "version", "not-specified") |
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317 | try: |
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318 | # only handle v1.0 resource configuration files |
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319 | assert version == u'1.0' |
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320 | except AssertionError: |
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321 | doc.unlink() |
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322 | return 'Cannot handle file version:', version |
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323 | # file verified now |
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324 | for pairNode in docElem.getElementsByTagName("XYpair"): |
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325 | title = self._get_attribute(pairNode, "name", "") |
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326 | selected = self._get_attribute(pairNode, "selected", "") |
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327 | pairnum = self.NewPair(title) |
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328 | if selected.lower() == "true": |
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329 | self.SelectPair(pairnum) |
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330 | self.NewEpicsConfig(pairnum) |
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331 | for EpicsNode in pairNode.getElementsByTagName("EPICS_configuration"): |
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332 | for axisNode in EpicsNode.getElementsByTagName("axis"): |
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333 | axis = self._get_attribute(axisNode, "name", "") |
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334 | #isMotorRec |
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335 | for flagNode in axisNode.getElementsByTagName("flag"): |
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336 | text = self._get_attribute(flagNode, "isMotorRec", "False") |
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337 | self.SetEpicsField(pairnum, axis, "isMotorRec", (text == "True")) |
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338 | for fieldNode in axisNode.getElementsByTagName("field"): |
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339 | name = self._get_attribute(fieldNode, "name", "") |
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340 | pv = self._get_attribute(fieldNode, "pv", "") |
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341 | if (len(name)>0) and (len(pv)>0): |
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342 | #print pairnum, axis, name, pv |
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343 | self.SetEpicsField(pairnum, axis, name, pv) |
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344 | for tabNode in pairNode.getElementsByTagName("tab"): |
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345 | title = self._get_attribute(tabNode, "name", "") |
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346 | selected = self._get_attribute(tabNode, "selected", "") |
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347 | tabnum = self.NewTab(pairnum, title) |
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348 | if selected.lower() == "true": |
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349 | self.SelectTab(pairnum, tabnum) |
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350 | # EPICS settings here |
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351 | for rowNode in tabNode.getElementsByTagName("row"): |
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352 | title = self._get_attribute(rowNode, "name", "") |
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353 | selected = self._get_attribute(rowNode, "selected", "") |
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354 | x = self._get_attribute(rowNode, "x", "") |
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355 | y = self._get_attribute(rowNode, "y", "") |
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356 | rownum = self.NewRow(pairnum, tabnum, title) |
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357 | self.SetRowXY(pairnum, tabnum, rownum, x, y) |
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358 | doc.unlink() # ensures XML document is disposed cleanly |
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359 | return None |
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360 | |
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361 | def _get_attribute(self, node, key, default): |
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362 | '''get a specific attribute or return the default |
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363 | @param node: XML Node object |
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364 | @param key: [string] name of attribute to find |
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365 | @param default: [string] default value to return''' |
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366 | value = default |
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367 | if node.attributes.has_key(key): |
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368 | value = node.attributes[key].value |
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369 | return value |
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370 | |
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371 | def SaveXmlFile(self): |
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372 | '''save the internal dictionary (self.db) to an XML file |
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373 | @note: What about using/saving a default stylesheet? |
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374 | @see: http://www.boddie.org.uk/python/XML_intro.html |
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375 | ''' |
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376 | out = open(self.settingsFile, 'w') |
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377 | out.write(repr(self)) |
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378 | out.close() |
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379 | # |
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380 | # What about a default stylesheet? |
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381 | # |
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382 | |
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383 | return 'Saved settings to ' + self.settingsFile |
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384 | |
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385 | def _SetAttr(self, node, attribute, value): |
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386 | '''add attributes that are not empty (but do not strip the whitespace) |
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387 | @param node: XML Node object |
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388 | @param attribute: [string] name of attribute |
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389 | @param value: [string] value of attribute''' |
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390 | if len(value) > 0: |
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391 | node.setAttribute(attribute, value) |
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392 | |
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393 | def _makeTextNode(self, doc, tag, value): |
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394 | '''create a text node for the XML file |
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395 | @param doc: [xml.dom.minidom documentElement object] |
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396 | @param tag: [string] element name |
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397 | @param value: [string] element text''' |
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398 | node = doc.createElement(tag) |
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399 | text = doc.createTextNode(value) |
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400 | node.appendChild(text) |
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401 | return node |
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402 | |
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403 | def __repr__(self): |
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404 | '''default representation of this structure is XML |
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405 | @return: XML representation of internal database (db) |
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406 | @note: What about a default stylesheet? |
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407 | ''' |
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408 | t = datetime.datetime.now() |
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409 | yyyymmdd = t.strftime("%Y-%m-%d") |
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410 | hhmmss = t.strftime("%H:%M:%S") |
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411 | |
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412 | # Create the minidom document |
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413 | doc = minidom.Document() |
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414 | |
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415 | # Create the root element |
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416 | root = doc.createElement(self.rootElement) |
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417 | self._SetAttr(root, "version", "1.0") |
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418 | self._SetAttr(root, "date", yyyymmdd) |
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419 | self._SetAttr(root, "time", hhmmss) |
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420 | doc.appendChild(root) |
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421 | selectedpairnum = self.GetSelectedPair() |
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422 | for pairnum in range(self.CountPairs()): |
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423 | pairnode = doc.createElement("XYpair") |
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424 | self._SetAttr(pairnode, "name", |
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425 | self.GetPairTitle(pairnum)) |
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426 | if selectedpairnum == pairnum: |
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427 | self._SetAttr(pairnode, "selected", "True") |
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428 | if self.db[u"pairs"][pairnum].has_key(u"epics"): |
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429 | epicsnode = doc.createElement("EPICS_configuration") |
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430 | epicsdb = self.db[u"pairs"][pairnum][u"epics"] |
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431 | for axis in epicsdb: |
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432 | axisnode = doc.createElement("axis") |
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433 | self._SetAttr(axisnode, "name", axis) |
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434 | field = "isMotorRec" |
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435 | node = doc.createElement("flag") |
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436 | self._SetAttr(node, field, str(epicsdb[axis][field])) |
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437 | axisnode.appendChild(node) |
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438 | for field in wxmtxy_axis.field_list: |
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439 | if len(epicsdb[axis][field])>0: |
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440 | node = doc.createElement("field") |
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441 | self._SetAttr(node, "name", field) |
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442 | self._SetAttr(node, "pv", str(epicsdb[axis][field])) |
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443 | axisnode.appendChild(node) |
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444 | epicsnode.appendChild(axisnode) |
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445 | pairnode.appendChild(epicsnode) |
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446 | selectedtabnum = self.GetSelectedTab(pairnum) |
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447 | for tabnum in range(self.CountTabs(pairnum)): |
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448 | tabnode = doc.createElement("tab") |
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449 | self._SetAttr(tabnode, "name", self.GetTabTitle(pairnum, tabnum)) |
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450 | if selectedtabnum == tabnum: |
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451 | self._SetAttr(tabnode, "selected", "True") |
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452 | selectedrownum = self.GetSelectedRow(pairnum, tabnum) |
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453 | for rownum in range(self.CountRows(pairnum, tabnum)): |
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454 | rownode = doc.createElement("row") |
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455 | label = self.GetRowTitle(pairnum, tabnum, rownum) |
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456 | x, y = self.GetRowXY(pairnum, tabnum, rownum) |
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457 | self._SetAttr(rownode, "name", label) |
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458 | self._SetAttr(rownode, "x", x) |
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459 | self._SetAttr(rownode, "y", y) |
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460 | if selectedrownum == rownum: |
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461 | self._SetAttr(rownode, "selected", "True") |
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462 | tabnode.appendChild(rownode) |
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463 | pairnode.appendChild(tabnode) |
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464 | root.appendChild(pairnode) |
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465 | return doc.toprettyxml(indent=" ") |
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466 | |
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467 | |
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468 | if __name__ == '__main__': |
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469 | rc = Settings("examples/test-settings.xml") |
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470 | rc.ReadXmlFile() |
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471 | rc.SetSettingsFile('output-test.xml') |
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472 | rc.SaveXmlFile() |
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473 | |
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474 | pj = Settings() |
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475 | pairnum = pj.NewPair("my test pair") |
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476 | tabnum = pj.NewTab(pairnum, title='my test tab') |
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477 | tabnum = pj.NewTab(pairnum, title='another') |
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478 | pj.SelectTab(pairnum, tabnum) |
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479 | tabnum = pj.NewTab(pairnum, title='another') |
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480 | tabnum = pj.NewTab(pairnum, title='another') |
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481 | pairnum = pj.NewPair("another") |
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482 | pj.SelectPair(pairnum) |
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483 | tabnum = pj.NewTab(pairnum, title='another') |
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484 | rownum = pj.NewRow(pairnum, tabnum, "beam center") |
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485 | pj.SelectRow(pairnum, tabnum, rownum) |
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486 | tabnum = pj.NewTab(pairnum, title='another') |
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487 | pairnum = pj.NewPair("another") |
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488 | print str(pj) |
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